U.S. patent application number 10/525223 was filed with the patent office on 2006-04-27 for monocyclopentadienyl complexes.
Invention is credited to Shahram Mihan, Ilya Nifant'ev.
Application Number | 20060089253 10/525223 |
Document ID | / |
Family ID | 31979450 |
Filed Date | 2006-04-27 |
United States Patent
Application |
20060089253 |
Kind Code |
A1 |
Mihan; Shahram ; et
al. |
April 27, 2006 |
Monocyclopentadienyl complexes
Abstract
Monocyclopentadienyl complexes in which the cyclopentadienyl
system bears at least one unsubstantiated, substituted or fused,
hetero aromatic ring system bound via a specific bridge, a catalyst
system, comprising at least one of these monocyclopentadienyl
complexes, the use of the catalyst system for the polymerization or
copolymerization of olefins and a process for preparing polyolefins
by polymerization or copolymerization of olefins in the presence of
the catalyst system and polymers obtainable therewith.
Inventors: |
Mihan; Shahram; (Bad Soden,
DE) ; Nifant'ev; Ilya; (Moscow, RU) |
Correspondence
Address: |
NOVAK DRUCE DELUCA & QUIGG, LLP
1300 EYE STREET NW
SUITE 400 EAST
WASHINGTON
DC
20005
US
|
Family ID: |
31979450 |
Appl. No.: |
10/525223 |
Filed: |
August 7, 2003 |
PCT Filed: |
August 7, 2003 |
PCT NO: |
PCT/JP03/10076 |
371 Date: |
February 22, 2005 |
Current U.S.
Class: |
502/152 ; 556/11;
556/52 |
Current CPC
Class: |
C08F 110/02 20130101;
C07F 17/00 20130101; C08F 210/16 20130101; B01J 31/2295 20130101;
C08F 4/63912 20130101; C08F 210/16 20130101; C08F 4/63916 20130101;
C08F 10/00 20130101; C08F 10/00 20130101; C08F 210/16 20130101;
C08F 2420/01 20130101; C08F 4/6392 20130101; B01J 2531/62 20130101;
B01J 2231/12 20130101; B01J 31/181 20130101; C08F 110/02 20130101;
C08F 2500/17 20130101; C08F 4/6192 20130101; C08F 210/14 20130101;
C08F 210/14 20130101; C08F 2500/10 20130101; C08F 2500/03 20130101;
C08F 2500/10 20130101; C08F 2500/08 20130101 |
Class at
Publication: |
502/152 ;
556/011; 556/052 |
International
Class: |
B01J 31/00 20060101
B01J031/00; C07F 17/00 20060101 C07F017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 13, 2002 |
DE |
1237646.8 |
Sep 17, 2002 |
US |
60411393 |
Claims
1. A monocyclopentadienyl complex which contains the structural
feature of the formula (Cp)(-Z-A).sub.mM (I), where the variables
have the following meanings: Cp is a cyclopentadienyl system, Z is
a bridge between A and Cp and is selected from the group consisting
of ##STR31## where L.sup.1B-L.sup.3B are each, independently of one
another, carbon or silicon, R.sup.1B-R.sup.6B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.7B.sub.3, where the organic radicals
R.sup.1B-R.sup.6B may also be substituted by halogens and two
geminal or vicinal radicals R.sup.1B-R.sup.6B or a radical
R.sup.1B-R.sup.6B and A may also be joined to form a five- or
six-membered ring and R.sup.7B are each, independently of one
another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring, A is an unsubstituted,
substituted or fused, heteroaromatic ring system, M is a metal
selected from the group consisting of titanium in the oxidation
state 3, vanadium, chromium, molybdenum and tungsten and m is 1, 2
or 3.
2. A monocyclopentadienyl complex as claimed in claim 1 of the
formula (Cp)(-Z-A).sub.mMX.sub.k (V), where the variables have the
following meanings: Cp is a cyclopentadienyl system, Z is a bridge
between A and Cp and is selected from the group consisting of
##STR32## where L.sup.1B-L.sup.3B are each, independently of one
another, carbon or silicon, R.sup.1B-R.sup.6B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.7B.sub.3, where the organic radicals
R.sup.1B-R.sup.6B may also be substituted by halogens and two
geminal or vicinal radicals R.sup.1B-R.sup.6B may also be joined to
form a five- or six-membered ring and R.sup.7B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring, A is an unsubstituted,
substituted or fused, heteroaromatic ring system, M is a metal
selected from the group consisting of titanium in the oxidation
state 3, chromium, molybdenum and tungsten, m is 1, 2 or 3, X are
each, independently of one another, fluorine, chlorine, bromine,
iodine, hydrogen, C.sub.1-C.sub.10-alkyl, C.sub.2-C.sub.10-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having 1-10 carbon atoms in the
alkyl part and 6-20 carbon atoms in the aryl part, NR.sup.1R.sup.2,
OR.sup.1, SR.sup.1, SO.sub.3R.sup.1, OC(O)R.sup.1, CN, SCN,
.beta.-diketonate, CO, BF.sub.4.sup.-, PF.sub.6.sup.- or a bulky
noncoordinating anion, R.sup.1-R.sup.2 are each, independently of
one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part,
SiR.sup.3.sub.3, where the organic radicals R.sup.1-R.sup.2 may
also be substituted by halogens and two radicals R.sup.1-R.sup.2
may also be joined to form a five- or six-membered ring, R.sup.3
are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.3 may also be joined to form a five- or six-membered
ring and k is 1, 2 or 3.
3. A monocyclopentadienyl complex as claimed in claim 1 or 2,
wherein the cyclopentadienyl system Cp has the formula (II):
##STR33## where the variables have the following meanings:
E.sup.1A-E.sup.5A are each carbon or not more than one E.sup.1A to
E.sup.5A is phosphorus, R.sup.1A-R.sup.5A are each, independently
of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part, NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2,
OR.sup.6A, OSiR.sup.6A.sub.3, SiR.sup.6A.sub.3, BR.sup.6A.sub.2,
where the organic radicals R.sup.1A-R.sup.5A may also be
substituted by halogens and two vicinal radicals R.sup.1A-R.sup.5A
may also be joined to form a five- or six-membered ring, and/or two
vicinal radicals R.sup.1A-R.sup.5A are joined to form a heterocycle
which contains at least one atom from the group consisting of N, P,
O and S, and where 1, 2 or 3 substituents R.sup.1A-R.sup.5A is a
group -Z-A and R.sup.6A are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl radical and 6-20 carbon atoms in the aryl radical and
two geminal radicals R.sup.6A may also be joined to form a five- or
six-membered ring.
4. A monocyclopentadienyl complex as claimed in any of claims 1 to
3, wherein the cyclopentadienyl system Cp together with -Z-A has
the formula (IV): ##STR34## where the variables have the following
meanings: E.sup.1A-E.sup.5A are each carbon or at most one E.sup.1A
to E.sup.5A is phosphorus, R.sup.1A-R.sup.4A are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-allyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part, NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2,
OR.sup.6A, OSiR.sup.6A.sub.3, SiR.sup.6A.sub.3, where the organic
radicals R.sup.1A-R.sup.4A may also be substituted by halogens and
two vicinal radicals R.sup.1A-R.sup.4A may also be joined to form a
five- or six-membered ring, and/or two vicinal radicals
R.sup.1A-R.sup.4A may be joined to form a heterocycle containing at
least one atom from the group consisting of N, P, O and S, R.sup.6A
are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
geminal radicals R.sup.6A may also be joined to form a five- or
six-membered ring. A is an unsubstituted, substituted or fused,
heteroaromatic ring system, Z is a bridge between A and Cp and is
selected from the group consisting of ##STR35## where
L.sup.1B-L.sup.3B are each, independently of one another, carbon or
silicon, R.sup.1B-R.sup.6B are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.7B.sub.3, where the organic radicals R.sup.1B-R.sup.6B may
also be substituted by halogens and two geminal or vicinal radicals
R.sup.1B-R.sup.6B may also be joined to form a five- or
six-membered ring and R.sup.7B are each, independently of one
another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring.
5. A monocyclopentadienyl complex as claimed in any of claims 1 to
4, wherein A has the formula (IIIa) or (IIIb): ##STR36## where the
variables have the following meanings: E.sup.1C-E.sup.4C are each
carbon or nitrogen, R.sup.1C-R.sup.4C are each, independently of
one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.5C.sub.3, where the organic radicals
R.sub.1C-R.sub.4C may also be substituted by halogens or nitrogen
and further C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.5C.sub.3 groups and two vincinal radicals R.sup.1C-R.sup.4C
or R.sup.1C and Z may also be joined to form a five- or
six-membered ring and R.sup.5C are each, independently of one
another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.5C may also be joined to
form a five- or six-membered ring and p is 0 when E.sup.1C-E.sup.4C
is nitrogen and 1 when E.sup.1C-E.sup.4C is carbon, G.sup.1C is
nitrogen, phosphorus, sulfur or oxygen, R.sup.6C-R.sup.8C are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.9C.sub.3, where the organic radicals
R.sup.6C-R.sup.8C may also be substituted by halogens or nitrogen
and further C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.9C.sub.3 groups and two vincinal radicals R.sup.6C-R.sup.8C
or R.sup.6C and Z may also be joined to form a 5- or 6-membered
ring and R.sup.9C are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl or alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.9C may also be joined to form a five- or
six-membered ring and g is 0 when G.sup.1C is sulfur or oxygen and
1 when G.sup.1C is nitrogen or phosphorus.
6. A monocyclopentadienyl complex as claimed in any of claims 1 to
5, wherein Z is selected from the group consisting of
--C(R.sup.1BR.sup.2B)--Si(R.sup.3BR.sup.4B)--,
CH.sub.2--C(R.sup.3BR.sup.4B)-- and 1,2-phenylene.
7. A catalyst system for olefin polymerization comprising A) at
least one monocyclopentadienyl complex as claimed in claims 1 to 6,
B) optionally, an organic or inorganic support, C) optionally, one
or more activating compounds, D) optionally, further catalysts
suitable for olefin polymerization and E) optionally, one or more
metal compounds containing a metal of group 1, 2 or 13 of the
Periodic Table.
8. A prepolymerized catalyst system comprising a catalyst system as
claimed in claim 7 and one or more linear
C.sub.2-C.sub.10-1-alkenes polymerized onto it in a mass ratio of
from 1:0.1 to 1:1 000 based on the catalyst system.
9. The use of a catalyst system as claimed in claim 7 or 8 for the
polymerization or copolymerization of olefins.
10. A process for preparing polyolefins by polymerization or
copolymerization of olefins in the presence of a catalyst system as
claimed in claim 7 or 8.
11. A process for preparing cyclopentadienyl systems of the formula
(V): ##STR37## where the variables have the following meanings:
R.sup.1A-R.sup.4A are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part,
NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2, OR.sup.6A,
OSi.sub.6A.sub.3, SiR.sup.6A.sub.3, where the organic radicals
R.sup.1A-R.sup.4A may also be substituted by halogens and two
vicinal radicals R.sup.1A-R.sup.4A may also be joined to form a
five- or six-membered ring, and/or two vicinal radicals
R.sup.1A-R.sup.4A are joined to form a heterocycle which contains
at least one atom from the group consisting of N, P, O and S.
R.sup.6A are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
geminal radicals R.sup.6A may also be joined to form a five- or
six-membered ring, A is an unsubstituted, substituted or fused,
heteroaromatic ring system, R.sup.1B-R.sup.4B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.7B.sub.3, where the organic radicals
R.sup.1B-R.sup.4B may also be substituted by halogens and two
geminal vicinal radicals R.sup.1B-R.sup.4B may also be joined to
form a five- or six-membered ring and R.sup.7B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring, M.sup.S a metal of group 1, 2 or
3 of the Periodic Table of the Elements, X.sup.S are each,
independently of one another, fluorine, chlorine, bromine, iodine,
hydrogen, C.sub.1-C.sub.10-alkyl, C.sub.2-C.sub.10-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having 1-10 carbon atoms in the
alkyl part and 6-20 carbon atoms in the aryl part, NR.sup.1R.sup.2,
OR.sup.1, SR.sup.1, SO.sub.3R.sup.1, OC(O)R.sup.1, CN, SCN,
.beta.-diketonate, CO, BF.sub.4.sup.-, PF.sub.6.sup.- or a bulky
noncoordinating anion and s 0, 1 or 2, r 1 or 2, with the proviso
that s+r is the oxidation state of M.sup.S-1, which comprises
reacting
(A-CR.sup.1BR.sup.2B.sup.-).sub.r(M.sup.SX.sup.S.sub.S).sup.+ with
a fulvene of the formula (VI) ##STR38##
12. A process for preparing cyclopentadienyl systems of the formula
(VIII): ##STR39## where the variables have the following meanings:
E.sup.6A-E.sup.10A are each carbon or not more than one E.sup.6A to
E.sup.10A is phosphorus, where four adjacent E.sup.6A-E.sup.10A
form a conjugated diene system and the remaining E.sup.6A-E.sup.10A
additionally bears a hydrogen atom, R.sup.1A-R.sup.4A are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part, NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2,
OR.sup.6A, OSiR.sup.6A.sub.3, SiR.sup.6A.sub.3, where the organic
radicals R.sup.1A-R.sup.4A may also be substituted by halogens and
two vicinal radicals R.sup.1A-R.sup.4A may also be joined to form a
five- or six-membered ring, and/or two vicinal radicals
R.sup.1A-R.sup.4A are joined to form a heterocycle which contains
at least one atom from the group consisting of N, P, O and S,
R.sup.6A are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
geminal radicals R.sup.6A may also be joined to form a five- or
six-membered ring, A is an unsubstituted, substituted or fused,
heteroaromatic ring system, R.sup.1B-R.sup.4B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.7B.sub.3, where the organic radicals
R.sup.1B-R.sup.4B may also be substituted by halogens and two
geminal or vicinal radicals R.sub.1B-R.sup.4B may also be joined to
form a five- or six-membered ring, and R.sup.7B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring, which comprises reacting
(A-CR.sup.1BR.sup.2B-).sub.r(M.sup.SX.sup.S.sub.S).sup.+ with a
cyclopentadienyl system of the formula (IX) ##STR40## where the
variables are as defined above and Q is a leaving group.
Description
[0001] The present invention relates to monocyclopentadienyl
complexes in which the cyclopentadienyl system bears at least one
unsubstituted, substituted or fused, heteroaromatic ring system
bound via a specific bridge and to a catalyst system comprising at
least one of these monocyclopentadienyl complexes, and also to a
process for preparing them.
[0002] In addition, the invention relates to the use of the
catalyst system for the polymerization of copolymerization of
olefins and to a process for preparing polyolefins by
polymerization or copolymerization of olefins in the presence of
the catalyst system and to polymers obtainable therewith.
[0003] Many of the catalysts which are used for the polymerization
of a-olefins are based on immobilized chromium oxides (cf., for
example, Kirk-Othmer, "Encyclopedia of Chemical Technology", 1981,
vol. 16, p. 402). These generally give ethylene homopolymers and
copolymers having high molecular weights, but are relatively
insensitive to hydrogen and thus do not allow the molecular weight
to be controlled in a simple manner. In contrast, the use of
bis(cyclopentadienyl)chromium (U.S. Pat. No. 3,709,853),
bis(indenyl)chromium or bis(fluorenyl)chromium (U.S. Pat. No.
4,015,059) applied to an inorganic, oxidic support allows the
molecular weight of polyethylene to be controlled in a simple
manner by addition of hydrogen.
[0004] As in the case of Ziegler-Natta systems, catalyst systems
having a uniquely defined, active center, known as single-site
catalysts, have recently been sought in the case of the chromium
compounds, too. Targeted variation of the ligand framework should
enable activity, copolymerization behavior of the catalyst and the
properties of polymers obtained in this way to be altered in a
simple manner.
[0005] Thus, EP 0 742 046 claims constrained geometry complexes of
transition group 6, a specific process for preparing them (via
metal tetraamides) and a process for preparing a polyolefin in the
presence of such catalysts. Polymerization examples are not given.
The ligand framework comprises an anionic donor which is bound to a
cyclopentadienyl radical.
[0006] In Organomet. 1996, 15, 5284-5286, K. H. Theopold et al.
describe an analogous
{[(tert-butylamido)dimethylsilyl](tetramethylcyclopentadienyl)}chromium
chloride complex for the polymerization of olefins. This complex
selectively polymerizes ethylene. Comonomers such as hexene are not
incorporated, nor can propene be polymerized.
[0007] This disadvantage can be overcome by the use of structurally
very similar systems. Thus, DE 197 10615 describes
monocyclopentadienylchromium compounds substituted by donor ligands
by means of which, for example, propene can also be polymerized.
Here, the donor is from group 15 and is uncharged. The donor is
bound to the cyclopentadienyl ring via a (ZR.sub.2).sub.n fragment,
where R is hydrogen, alkyl or aryl, Z is an atom of group 14 and n
is .gtoreq.1. DE 196 30 580 specifically claims Z=carbon in
combination with an amine donor.
[0008] WO 96/13529 describes reduced transition metal complexes of
groups 4 to 6 of the Periodic Table with polydentate monoanionic
ligands. These include cyclopentadienyl ligands containing a donor
function. The examples are restricted to titanium compounds.
[0009] There are also ligand systems in which the donor group is
rigidly joined to the cyclopentadienyl radical. Such ligand systems
and their metal complexes are summarized by, for example, P. Jutzi
and U. Siemeling in J. Orgamet. Chem. (1995), 500, 175-185, section
3. In Chem. Ber. (1996), 129, 459-463, M. Enders et al. describe
8-quinolyl-substituted cyclopentadienyl ligands and their titanium
trichloride and zirconium trichloride complexes.
2-Picolylcyclopentadienyltitanium trichloride in combination with
MAO has been used by M. Blais, J. Chien and M. Rausch in Organomet.
(1998), 17 (17) 3775-3783, for the polymerization of olefins.
[0010] WO 01/12641 describes monocyclopentadienyl complexes of
chromium, molybdenum and tungsten which bear, in particular,
quinolyl or pyridyl donors which are bound either directly or via a
Cl or Si bridge to the cyclopentadienyl system. It is an object of
the present invention to find further transition metal complexes
based on cyclopentadienyl ligands having a bridged donor which are
suitable for the polymerization of olefins. A further object of the
invention is to find an advantageous process for preparing such
complexes.
[0011] We have found that the first of these objects is achieved by
monocyclopentadienyl complexes which contain the structural feature
of the formula (Cp)(-Z-A).sub.mM (I), where the variables have the
following meanings: [0012] Cp is a cyclopentadienyl system, [0013]
Z is a bridge between A and Cp and is selected from the group
consisting of ##STR1## [0014] where [0015] L.sup.1B-L.sup.3B are
each, independently of one another, carbon or silicon, [0016]
R.sup.1B-R.sup.6B are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.7B.sub.3, where the organic radicals R.sup.1B-R.sup.6B may
also be substituted by halogens and two geminal or vicinal radicals
R.sup.1B-R.sup.6B or a radical R.sup.1B-R.sup.6B and A may also be
joined to form a five- or six-membered ring and [0017] R.sup.7B are
each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl or alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.7B may also be joined to form a five- or
six-membered ring, [0018] A is an unsubstituted, substituted or
fused, heteroaromatic ring system, [0019] M is a metal selected
from the group consisting of titanium in the oxidation state 3,
vanadium, chromium, molybdenum and tungsten and [0020] m is 1, 2 or
3.
[0021] Furthermore, we have found a catalyst system comprising the
monocyclopentadiehyl complexes of the invention, the use of the
monocyclopentadienyl complexes or of the catalyst system for the
polymerization or copolymerization of olefins and a process for
preparing polyolefins by polymerization of copolymerization of
olefins in the presence of the monocyclopentadienyl complex or the
catalyst system and polymers obtainable therefrom.
[0022] The monocyclopentadienyl complexes of the present invention
contain the structural element of the formula (Cp)(-Z-A).sub.mM
(I), where the variables are as defined above. Further ligands can
therefore be bound to the metal atom M. The number of further
ligands depends, for example, on the oxidation state of the metal
atom. Possible further ligands do not include further
cyclopentadienyl systems. Suitable further ligands are monoanionic
and dianionic ligands as are described, for example, for X. In
addition, Lewis bases such as amines, ethers, ketones, aldehydes,
esters, sulfides or phosphines can also be bound to the metal
center M.
[0023] Cp is a cyclopentadienyl system which may be substituted as
desired and/or fused with one or more aromatic, aliphatic,
heterocyclic or heteroaromatic rings, wherein 1, 2 or 3
substituents, preferably 1 substituent, is the group -Z-A. The
cyclopentadienyl skeleton itself is a C.sub.5-ring system having 6
.pi. electrons, in which one of the carbon atoms can also be
replaced by nitrogen or phosporus, preferably phosphorus.
Preference is given to using C.sub.5-ring systems without
replacement by a heteroatom. A heteroaromatic ring containing at
least one atom from the group consisting of N, P, O and S or an
aromatic ring can, for example, be fused onto this cyclopentadienyl
skeleton. In the present context, fused-on means that the
heterocycle and the cyclopentadienyl skeleton have two atoms,
preferably carbon atoms, in common. Preference is given to
cyclopentadienyl systems Cp of the formula (II) ##STR2## [0024]
where the variables have the following meanings: [0025]
E.sup.1A-E.sup.5A are each carbon or not more than one E.sup.1A to
E.sup.5A is phosphorus, R.sup.1A-R.sup.5A are each, independently
of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part, NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2,
OR.sup.6A, OSiR.sup.6A.sub.3, SiR.sup.6A.sub.3, BR.sup.6A.sub.2,
where the organic radicals R.sup.1A-R.sup.5A may also be
substituted by halogens and two vicinal radicals R.sup.1A-R.sup.5A
may also be joined to form a five- or six-membered ring, and/or two
vicinal radicals R.sup.1A-R.sup.5A are joined to form a heterocycle
which contains at least one atom from the group consisting of N, P,
O and S, where 1, 2 or 3 substituents, preferably 1 substituent,
R.sup.1A-R.sup.5A is a group -Z-A and [0026] R.sup.6A are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl radical and 6-20 carbon
atoms in the aryl radical and two geminal radicals R.sup.6A may
also be joined to form a five- or six-membered ring.
[0027] In preferred cyclopentadienyl systems Cp, all E.sup.1A to
E.sup.5A are carbon.
[0028] Two vicinal radicals R.sup.1A-R.sup.5A can, in each case
together with the E.sup.1A-E.sup.5A to which they are bound, form a
heterocycle, preferably a heteroaromatic, which contains at least
one atom from the group consisting of nitrogen, phosphorus, oxygen
and sulfur, particularly preferably nitrogen and/or sulfur, with
the E.sup.1A-E.sup.5A present in the heterocycle or heteroaromatic
are preferably carbon atoms. Preference is given to heterocycles
and heteroaromatics having a ring size of 5 or 6 ring atoms.
Examples of 5-membered heterocycles, which may contain from 1 to 4
nitrogen atoms and/or a sulfur or oxygen atom as ring atoms in
addition to carbon atoms, are 1,2-dihydrofuran, furan, thiophene,
pyrrole, isoxazole, 3-isothiazole, pyrazole, oxazole, thiazole,
imidazole, 1,2,4-oxadiazole, 1,2,5-oxadiazole, 1,3,4-oxadiazole,
1,2,3-triazole and 1,2,4-triazole. Examples of 6-membered
heteroaryl groups, which may contain from 1 to 4 nitrogen atoms
and/or a phosphorus atom, are pyridine, phosphabenzene, pyridazine,
pyrimidine, pyrazine, 1,3,5-triazine, 1,2,4-triazine and
1,2,3-triazine. The 5- and 6-membered heterocycles may also be
substituted by C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.10-aryl,
alkylaryl having from 1 to 10 carbon atoms in the alkyl part and
6-10 carbon atoms in the aryl part, trialkylsilyl or halogens such
as fluorine, chlorine or bromine, dialkylamide, alkylarylamide,
diarylamide, alkoxy or aryloxy or be fused with one or more
aromatics or heteroaromatics. Examples of the benzo-fused
5-membered heteroaryl groups are indole, indazole, benzofuran,
benzothiophene, benzothiazole, benzoxazole and benzimidazole.
Examples of benzo-fused 6-membered heteroaryl groups are chroman,
benzopyran, quinoline, isoquinoline, cinnoline, phthalazine,
quinazoline, quioxaline, 1,10-phenanthroline and quinolizine.
Naming and numbering of the heterocycles has been taken from
Lettau, Chemie der Heterocyclen, 1st edition, VEB, Weinheim 1979.
The heterocycles/heteroaromatics are preferably fused with the
cyclopentadienyl skeleton via a C--C double bond of the
heterocycle/heteroaromatic. Heterocycles/heteroaromatics containing
a heteroatom are preferably 2,3-fused or b-fused.
[0029] Examples of cyclopentadienyl systems Cp having a fused
heterocycle are thiapentalene, 2-methylthiapentalene,
2-ethylthiapentalene, 2-isopropylthiapentalene,
2-n-butylthiapentalene, 2-tert-butylthiapentalene,
2-trimethylsilylthiapentalene, 2-phenylthiapentalene,
2-naphthylthiapentalene, 3-methylthiopentalene,
4-phenyl-2,6-dimethyl-1-thiapentalene,
4-phenyl-2,6-diethyl-1-thiapentalene,
4-phenyl-2,6-diisopropyl-1-thiapentalene,
4-phenyl-2,6-di-n-butyl-1-thiapentalene,
4-phenyl-2,6-di(trimethylsilyl)-1-thiapentalene, azapentalene,
2-methylazapentalene, 2-ethylazapentalene, 2-isopropylazapentalene,
2-n-butylazapentalene, 2-trimethylsilylazapentalene,
2-phenylazapentalene, 2-naphthylazapentalene,
1-phenyl-2,5-dimethyl-1-azapentalene,
1-phenyl-2,5-diethyl-1-azapentalene,
1-phenyl-2,5-di-n-butyl-1-azapentalene,
1-phenyl-2,5-di-tert-butyl-1-azapentalene,
1-phenyl-2,5-di(trimethysilyl)-1-azapentalene,
1-tert-butyl-2,5-dimethyl-1-azapentalene, oxapentalene,
phosphapentalene, 1-phenyl-2,5-dimethyl-1-phosphapentalene,
1-phenyl-2,5-diethyl-1-phqsphapentalene,
1-phenyl-2,5-di-n-butyl-1-phosphapentalene,
1-phenyl-2,5-di-tert-butyl-1-phosphapentalene,
1-phenyl-2,5-di(trimethylsilyl)-1-phosphapentalene,
1-methyl-2,5-dimethyl-1-phosphapentalene,
1-tert-butyl-2,5-dimethyl-1-phosphapentalene,
7-cyclopenta-[1,2]thieno[3,4]cyclopentadiene or
7-cyclopenta[1,2]pyrrolo[3,4]cyclopentadiene.
[0030] In further preferred cyclopentadienyl systems Cp, four of
the radicals R.sup.1A-R.sup.5A i.e. two pairs of vicinal radicals,
form two heterocycles, in particular heteroaromatics. The
heterocyclic systems are the same as those described in more detail
above. Examples of cyclopentadienyl systems Cp having two fused-on
heterocycles are 7-cyclopentadithiophene, 7cyclopentadipyrrole or
7-cyclopentadiphosphole.
[0031] The synthesis of such cyclopentadienyl systems having a
fused-on heterocycle is described, for example, in the
abovementioned WO 98/22486. In "metalorganic catalysts for
synthesis and polymerization", Springer Verlag 1999, p. 150 ff,
Ewen et al. describe further syntheses of these cyclopentadienyl
systems.
[0032] The polymerization behavior of the metal complexes can
likewise be influenced by variation of the substituents
R.sup.1A-R.sup.5A. The number and type of substituents can
influence the ability of the olefins to be polymerized to gain
access to the metal atom M. This makes it possible to modify the
activity and selectivity of the catalyst in respect of various
monomers, in particular bulky monomers. Since the substituents can
also influence the rate of termination reactions of the growing
polymer chain, the molecular weight of the polymers formed can also
be altered in this way. The chemical structure of the substituents
R.sup.1A to R.sup.5A can therefore be varied within a wide range in
order to achieve the desired results and to obtain a tailored
catalyst system.
[0033] Possible carboorganic substituents R.sup.1A-R.sup.5A are,
for example, the following: C.sub.1-C.sub.20-alkyl which may be
linear or branched, e.g. methyl, ethyl, n-propyl, isopropyl,
n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl,
n-octyl, n-nonyl, n-decyl or n-dodecyl, 5- to 7-membered cycloalkyl
which may in turn bear a C.sub.6-C.sub.10-aryl group as
substituent, e.g. cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl,
cycloheptyl, cyclooctyl, cyclononyl or cyclododecyl,
C.sub.2-C.sub.20-alkenyl which may be linear, cyclic or branched
and have an internal or terminal double bond, e.g. vinyl, 1-allyl,
2-allyl, 3-allyl, butenyl, pentenyl, hexenyl, cyclopentenyl,
cyclohexenyl, cyclooctenyl or cyclooctadienyl,
C.sub.6-C.sub.20-aryl which may be substituted by further alkyl
groups, e.g. phenyl, naphthyl, biphenyl, anthranyl, o-, m-,
p-methylphenyl, 2,3-, 2,4-, 2,5- or 2,6-dimethylphenyl, 2,3,4-,
2,3,5-, 2,3,6-, 2,4,5-, 2,4,6- or 3,4,5-trimethylphenyl, or
arylalkyl which may be substituted by further alkyl groups, e.g.
benzyl, o-, m-, p-methylbenzyl, 1- or 2-ethylphenyl, where two
R.sup.1A to R.sup.5A may also be joined to form a 5- or 6-membered
ring and the organic radicals R.sup.1A-R.sup.5A may also be
substituted by halogens, e.g. fluorine, chlorine or bromine.
Furthermore, R.sup.1A-R.sup.5A can also be amino or alkoxyl, for
example dimethylamino, n-pyrrolidinyl, picolinyl, methoxy, ethoxy
or isopropoxy. In organosilicon substituents SiR.sup.6A.sub.3,
R.sup.6A may be the same radicals as described in more detail above
for R.sup.1A-R.sup.5A, with two R.sup.6A also being able to be
joined to form a 5- or 6-membered ring. Examples of substituents
SiR.sup.6A.sub.3 are trimethylsilyl, triethylsilyl,
butyldimethylsilyl, tributylsilyl, tri-tert-butylsilyl,
triallylsilyl, triphenylsilyl and dimethylphenylsilyl. These
SiR.sup.6A.sub.3 radicals can also be joined to the
cyclopentadienyl skeleton via an oxygen or nitrogen atom, for
example trimethylsilyloxy, triethylsilyloxy, butyldimethylsilyloxy,
tributylsilyoxy or tri-tert-butylsilyloxy. Preferred radicals
R.sup.1A-R.sup.5A are hydrogen, methyl, ethyl, n-propyl, isopropyl,
n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl,
n-octyl, vinyl, allyl, benzyl, phenyl, ortho-dialkyl- or
ortho-dichloro-substituted phenyls, trialkyl- or
trichloro-substituted phenyls, naphthyl, biphenyl and anthranyl. As
organosilicon substituents, particular preference is given to
trialkylsilyl groups having from 1 to 10 carbon atoms in the alkyl
radical, in particular trimethylsilyl groups.
[0034] Examples of such cyclopentadienyl systems (without the group
-Z-A, which is preferably located in the 1 position) are
3-methylcyclopentadienyl, 3-ethylcyclopentadienyl,
3-isopropylcyclopentadienyl, 3-tert-butylcyclopentadienyl,
dialkylcyclopentadienyl such as tetrahydroindenyl,
2,4-dimethylcyclopentadienyl or
3-methyl-5-tert-butylcyclopentadienyl, trialkylcyclopentadienyl
such as 2,3,5-trinethylcyclopentadienyl or
tetraalkylcyclopentadienyl such as
2,3,4,5-tetramethylcyclopentadienyl.
[0035] Preference is also given to compounds in which two vicinal
radicals R.sup.1A-R.sup.5A form a cyclic fused ring system, i.e.
together with the E.sup.1A-E.sup.5A skeleton, preferably a
C.sub.5-cyclopentadienyl skeleton, form, for example, an
unsubstituted or substituted indenyl, benzindenyl, phenanthrenyl,
fluorenyl or tetrahydroindenyl system, for example indenyl,
2-methylindenyl, 2-ethylindenyl, 2-isopropylindenyl,
3-methylindenyl, benzindenyl or 2-methylbenzindenyl.
[0036] The fused ring system may be a further
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part,
NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2, OR.sup.6A,
OSiR.sup.6A.sub.3 or SiR.sup.6A.sub.3 groups, e.g. 4-methylindenyl,
4-ethylindenyl, 4-isopropylindenyl, 5-methylindenyl,
4-phenylindenyl, 5-methyl-4-phenylindenyl, 2-methyl-4-phenylindenyl
or 4-naphthylindenyl.
[0037] Preferred substituents R.sup.1A-R.sup.5A which do not form
-Z-A are the carboorganic substituents described above and the
carboorganic substituents which form a cyclic fused ring system, in
particular their preferred embodiments.
[0038] m can be 1, 2 or 3, i.e. 1, 2 or 3 radicals
R.sup.1A-R.sup.5A are -Z-A, where if 2 or 3-Z-A radicals are
present, these can be identical or different. Preference is given
to only one of the radicals R.sup.1A-R.sup.5A being -Z-A (m=1).
[0039] As in the case of the metallocenes, the monocyclopentadienyl
complexes of the present invention may be chiral. Thus, one of the
substituents R.sup.1A-R.sup.5A of the cyclopentadienyl skeleton can
have one or more chiral centers, or else the cyclopentadienyl
system Cp can itself be enantiotopic, so that chirality is induced
only when the cyclopentadienyl system is bound to the transition
metal M (for formalisms regarding chirality in cyclopentadienyl
compounds, cf. R. Halterman, Chem. Rev. 92, (1992), 965-994).
[0040] Possible carboorganic substituents R.sup.1B-R.sup.6B on the
link Z are, for example, the following: C.sub.1-C.sub.20-alkyl
which may be linear or branched, e.g. methyl, ethyl, n-propyl,
isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl,
n-heptyl, n-octyl, n-nonyl, n-decyl or n-dodecyl, 5- to 7-membered
cycloalkyl which may in turn bear a C.sub.6-C.sub.10-aryl group as
substituent, e.g. cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl,
cycloheptyl, cyclooctyl, cyclononyl or cyclododecyl,
C.sub.2-C.sub.20-alkenyl which may be linear, cyclic or branched
and have an internal or terminal double bond, e.g. vinyl, 1-allyl,
2-allyl, 3-allyl, butenyl, pentenyl, hexenyl, cyclopentenyl,
cyclohexenyl, cyclooctenyl or cyclooctadienyl,
C.sub.6-C.sub.20-aryl which may be substituted by further alkyl
groups, e.g. phenyl, naphthyl, biphenyl, anthranyl, o-, m-,
p-methylphenyl, 2,3-, 2,4-, 2,5- or 2,6-dimethylphenyl, 2,3,4-,
2,3,5-, 2,3,6-, 2,4,5-, 2,4,6- or 3,4,5-trimethylphenyl, or
arylalkyl which may be substituted by further alkyl groups, e.g.
benzyl, o-, m-, p-methylbenzyl, 1- or 2-ethylphenyl, where two
R.sup.1B to R.sup.6B may also be joined to form a 5- or 6-membered
ring for example cyclohexane, and the organic radicals
R.sup.1B-R.sup.6B may also be substituted by halogens, e.g.
fluorine, chlorine or bromine, and alkyl or aryl. In organosilicon
substituents SiR.sup.7B.sub.3, R.sup.7B may be the same radicals as
described in more detail above for R.sup.1B-R.sup.6B, with two
R.sup.7B also being able to be joined to form a 5- or 6-membered
ring. Examples of substituents SiR.sup.7B.sub.3 are trimethylsilyl,
triethylsilyl, butyldimethylsilyl, tributylsilyl,
tri-tert-butylsilyl, triallylsilyl, triphenylsilyl and
dimethylphenylsilyl. Preferred radicals R.sub.1B-R.sup.6B are
hydrogen, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl,
tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, benzyl, phenyl,
ortho-dialkyl- or ortho-dichloro-substituted phenyls, trialkyl- or
trichloro-substituted phenyl, naphthyl, biphenyl and anthranyl.
[0041] The bridge Z between the cyclopentadienyl system Cp and the
heterocycle A is an organic, preferably divalent bridge comprising
carbon and/or silicon units. Z can be bound to the cyclopentadienyl
skeleton or to the heterocycle or the fused-on ring of the
cyclopentadienyl system. Z is preferably bound to the
cyclopentadienyl skeleton. A change in the length of the link
between the cyclopentadienyl system and A can influence the
activity of the catalyst. Very particular preference is given to Z
being bound to the cyclopentadienyl skeleton in a position adjacent
to the fused-on heterocycle or aromatic. Thus, for example, if the
heterocycle or aromatic is fused-on in the 2,3 position of the
cyclopentadienyl skeleton, Z is preferably located in the 1 or 4
position of the cyclopentadienyl skeleton.
[0042] Preferred bridges Z are
--C(R.sup.1BR.sup.2B)--C(R.sup.3BR.sup.4B)--,
--C(R.sup.1BR.sup.2B)--Si(R.sup.3BR.sup.4B)-- or 1,2-phenylene. The
--C(R.sup.1BR.sup.2B) group in
--C(R.sup.1BR.sup.2B)--Si(R.sup.3BR.sup.4B) can be bound to A or
Cp. --C(R.sup.1BR.sup.2B)-- is preferably bound to A, since these
compounds are simple and inexpensive to prepare. In these,
--C(R.sup.1BR.sup.2B)-- is preferably CH.sub.2, so that
--CH.sub.2--C(R.sup.3BR.sup.4B)-- and
CH.sub.2--Si(R.sup.3BR.sup.4B)-- are particularly preferred as
bridges Z, preferably --CH.sub.2--C(CH.sub.3).sub.2--. The CH.sub.2
group in these, i.e. --CH.sub.2--C(CH.sub.3).sub.2--, is preferably
bound to A. Z is particularly preferably a
--C(R.sup.1BR.sup.2B)--Si(R.sup.3BR.sup.4B)--, 1,2-cyclohexanediyl
or 1,2-phenylene bridge. The above-described embodiments and
preferred embodiments for R.sup.1B-R.sup.4B and R.sup.7B also apply
to these preferred monocyclopentadienyl complexes.
[0043] A is an unsubstituted, substituted or fused heteroaromatic
ring system whose ring can contain, in addition to carbon atoms,
heteroatoms selected from the group consisting of oxygen, sulfur,
nitrogen and phosphorus. Examples of 5-membered heteroaryl groups,
which can contain from 1 to 4 nitrogen atoms or from 1 to 3
nitrogen atoms and/or a sulfur or oxygen atom as ring atoms in
addition to carbon, are 2-furyl, 2-thienyl, 2-pyrrolyl,
3-isoxazolyl, 5-isoxazolyl, 3-isothiazolyl, 5-isothiazolyl,
1-pyrazolyl, 3-pyrazolyl, 5-pyrazolyl, 2-oxazolyl, 4-oxazolyl,
5-oxazolyl, 2-thiazolyl, 4-thiazolyl, 5-thiazolyl, 2-imidazolyl,
4-imidazolyl, 5-imidazolyl, 1,2,4-oxadiazol-3-yl,
1,2,4-oxadiazol-5-yl, 1,3,4-oxadiazol-2-yl and 1,2,4-triazol-3-yl.
Examples of 6-membered heteroaryl groups, which can contain from 1
to 4 nitrogen atoms and/or a phosphorus atom, are 2-pyridinyl,
2-phosphabenzenyl, 3-pyridazinyl, 2-pyrimidinyl, 4-pyrimidinyl,
2-pyrazinyl, 1,3,5-triazin-1-yl and 1,2,4-triazin-3-yl,
1,2,4-triazin-5-yl and 1,2,4-triazin-6-yl. The 5-membered and
6-membered heteroaryl groups can also be substituted by
C.sub.1-C.sub.10-allyl, C.sub.6-C.sub.10-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-10 carbon atoms
in the aryl part, trialkylsilyl or halogens such as fluorine,
chlorine or bromine or be fused with one or more aromatics or
heteroaromatics. Examples of benzo-fused 5-membered heteroaryl
groups are 2-indolyl, 7-indolyl, 2-coumaronyl, 7-coumaronyl,
2-thianaphthenyl, 7-thianaphthenyl, 3-indazolyl, 7-indazolyl,
2-benzimidazolyl and 7-benzimidazolyl. Examples of benzo-fused
6-membered heteroaryl groups are 2-quinolyl, 8-quinolyl,
3-cinnolyl, 8-cinnolyl, 1-phthalazyl, 2-quinazolyl, 4-quinazolyl,
8-quinazolyl, 5-quinoxalyl, 4-acridyl, 1-phenanthridyl and
1-phenazyl.
[0044] A can bind to the metal M either intermolecularly or
intramolecularly. A is preferably bound intramolecularly to M. The
synthesis to bind A to the cyclopentadienyl ring can be carried
out, for example, by a method analogous to that of M. Enders et al.
in Chem. Ber. (1996), 129, 459-463 or P. Jutzi and U. Siemeling in
J. Orgmet. Chem. (1995), 500, 175-185.
[0045] Among these heteroaromatic systems, particular preference is
given to unsubstituted, substituted and/or fused 6-membered
heteroaromatics having 1, 2, 3, 4 or 5 nitrogen atoms in the
heteroaromatic unit bound to Z, in particular 2-pyridyl or
2-quinolyl. A is therefore preferably a group of the formula (IIa)
##STR3## [0046] where [0047] E.sup.1C-E.sup.4C are each carbon or
nitrogen, [0048] R.sup.1C-R.sup.4C are each, independently of one
another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.5C.sub.3, where the organic radicals
R.sup.1C-R.sup.4C may also be substituted by halogens or nitrogen
and further C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.5C.sub.3 groups and two vincinal radicals R.sup.1C-R.sup.4C
or R.sup.1C and Z may also be joined to form a 5- or 6-membered
ring and [0049] R.sup.5C are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl or alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.5C may also be joined to form a five- or
six-membered ring and [0050] p is 0 when E.sup.1C-E.sup.4C is
nitrogen and 1 when E.sup.1C-E.sup.4C is carbon.
[0051] In particular, 0 or 1 E.sup.1C-E.sup.4C is nitrogen and the
others are carbon. A is particularly preferably 2-pyridyl,
6-methyl-2-pyridyl, 4-methyl-2-pyridyl, 5-methyl-2-pyridyl,
5-ethyl-2-pyridyl, 4,6-dimethyl-2-pyridyl, 3-pyridazyl,
4-pyrimidyl, 6-methyl-4-pyrimidyl, 2-pyrazinyl,
6-methyl-2-pyrazinyl, 5-methyl-2-pyrazinyl, 3-methyl-2-pyrazinyl,
3-ethylpyrazinyl, 3,5,6-trimethyl-2-pyrazinyl, 2-quinolyl,
4-methyl-2-quinolyl, 4-methyl-2-quinolyl, 6-methyl-2-quinolyl,
7-methyl-2-quinolyl, 2-quinoxalyl or 3-methyl-2-quinoxalyl.
[0052] In another preferred embodiment A is a group of the formula
(IIIb) ##STR4## where [0053] G.sup.1C is nitrogen, phosphorus,
sulfur or oxygen, [0054] R.sup.6C-R.sup.8C are each, independently
of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.9C.sub.3, where the organic radicals
R.sup.6C-R.sup.8C may also be substituted by halogens or nitrogen
and further C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.9C.sub.3 groups and two vincinal radicals R.sup.6C-R.sup.8C
or R.sup.6C and Z may also be joined to form a 5- or 6-membered
ring and [0055] R.sup.9C are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl or alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.9C may also be joined to form a five- or
six-membered ring and [0056] g is 0 when G.sup.1C is sulfur or
oxygen and 1 when G.sup.1C is nitrogen or phosphorus.
[0057] Preferably G.sup.1C is nitrogen. A is particularly
preferably 2-(1,3-oxazolyl), 2-(benzoxazolyl), 2-(1,3-thiazolyl),
2-(benzothiazolyl), 2-imidazolyl, 2-(1-methyl-imidazolyl),
2-(1-butyl-imidazolyl), 2-(1-benzyl-imidazolyl),
2-(1-phenyl-imidazolyl) or 2-benzimidazolyl.
[0058] In preferred monocyclopentadienyl complexes, the
cyclopentadienyl system Cp and -Z-A form a ligand (Cp-Z-A) of
formula IV: ##STR5## [0059] where the variables A, Z, E.sup.1A to
E.sup.5A and R.sup.6A are as defined above and their preferred
embodiments are also preferred here and [0060] R.sup.1A-R.sup.4A
are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part,
NR.sup.6A.sub.2, N(Si.sup.6A.sub.3), OR.sup.6A, OSiR.sup.6A.sub.3,
SiR.sup.6A.sub.3, BR.sup.6A.sub.2, where the organic radicals
R.sup.1A-R.sup.4A may also be substituted by halogens and two
vicinal radicals R.sup.1A-R.sup.4A may also be joined to form a
five- or six-membered ring, and/or two vicinal radicals
R.sup.1A-R.sup.4A are joined to form a heterocycle which contains
at least one atom from the group consisting of N, P, O and S.
[0061] For R.sup.1A-R.sup.4A, what has been said above and the
preferred embodiments likewise apply.
[0062] In particular, the monocyclopentadienyl complex contains the
ligand (Cp-Z-A) of the formula IV in the following preferred
embodiment:
[0063] Z is selected from among
--C(R.sup.1B-R.sup.2B)--Si(R.sup.3BR.sup.4B)--,
--CH.sub.2--C(R.sup.3BR.sup.4B) and 1,2-phenylene, preferably
--CH.sub.2--C(.sup.3BR.sup.4B), where --C(R.sup.1BR.sup.2B)-- and
--CH.sub.2-- is preferably bound to A and the phenylene can be
substituted further: ##STR6## [0064] where [0065] R.sup.1B-R.sup.3B
are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.7B.sub.3, where the organic radicals R.sup.1B-R.sup.2B may
also be substituted by halogens and two geminal or vicinal radicals
R.sup.1B-R.sup.4B may also be joined to form a five- or
six-membered ring and [0066] R.sup.3B-R.sup.4B are each,
independently of one another, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.7B.sub.3, where the organic radicals
R.sup.3B-R.sup.4B may also be substituted by halogens and two
geminal or vicinal radicals R.sup.1B-R.sup.4B may also be joined to
form a five- or six-membered ring and [0067] R.sup.7B are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring and ##STR7## [0068] where [0069]
E.sup.1C-E.sup.4C are each carbon or nitrogen, [0070]
R.sup.1C-R.sup.4C are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.5C.sub.3, where the organic radicals R.sup.1C-R.sup.4C may
also be substituted by halogens and further C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.5C.sub.3 groups and two vincinal
radicals R.sup.1C-R.sup.4C or R.sup.1C and Z may also be joined to
form a 5- or 6-membered ring and [0071] R.sup.5C are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.5C may also be joined to
form a five- or six-membered ring and [0072] p is 0 when
E.sup.1C-E.sup.4C is nitrogen and 1 when E.sup.1C-E.sup.4C is
carbon and [0073] G.sup.1C is nitrogen, phosphorus, sulfur or
oxygen, [0074] R.sup.6C-R.sup.8C are each, independently of one
another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.9C.sub.3, where the organic radicals
R.sup.6C-R.sup.8C may also be substituted by halogens or nitrogen
and further C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.9C.sub.3 groups and two vincinal radicals R.sup.6C-R.sup.8C
or R.sup.6C and Z may also be joined to form a 5- or 6-membered
ring and [0075] R.sup.9C are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl or alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.9C may also be joined to form a five- or
six-membered ring and [0076] g is 0 when G.sup.1C is sulfur or
oxygen and 1 when G.sup.1C is nitrogen or phosphorus.
[0077] For A, Z, R.sup.1A-R.sup.4A, R.sup.6A, R.sup.1B-R.sup.4B and
R.sup.7B what has been said above and the preferred embodiments
likewise apply.
[0078] M is a metal selected from the group consisting of titanium
in the oxidation state 3, vanadium, chromium, molybdenum and
tungsten, preferably titanium in the oxidation state 3, chromium,
molybdenum and tungsten. Particular preference is given to chromium
in the oxidation states 2, 3 and 4, in particular 3. The metal
complexes, in particular the chromium complexes, can be obtained in
simple manner by reacting the corresponding metal salts, e.g. metal
chlorides, with the ligand anion (e.g. using methods analogous to
the examples in DE 197 10615.
[0079] Among the monocyclopentadienyl complexes of the present
invention, preference is given to those of the formula
(Cp)(-Z-A).sub.mMX.sub.k (V), where the variables Cp, Z, A, m and M
are as defined above and their preferred embodiments are also
preferred here and: [0080] X are each, independently of one
another, fluorine, chlorine, bromine, iodine, hydrogen,
C.sub.1-C.sub.10-alkyl, C.sub.2-C.sub.10-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having 1-10 carbon atoms in the
alkyl part and 6-20 carbon atoms in the aryl part, NR.sup.1R.sup.2,
OR.sup.1, SR.sup.1, SO.sub.3R.sup.1, OC(O)R.sup.1, CN, SCN,
.beta.-diketonate, CO, BF.sub.4.sup.-, PF.sub.6.sup.- or a bulky
noncoordinating anion, [0081] R.sup.1-R.sup.2 are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.3.sub.3, where the organic radicals
R.sup.1-R.sup.2 may also be substituted by halogens or nitrogen-
and oxygen-containing groups and two radicals R.sup.1-R.sup.2 may
also be joined to form a 5- or 6-membered ring,
[0082] R.sup.3 are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.3 may also be joined to form a 5- or 6-membered ring
and [0083] k is 1, 2 or 3.
[0084] The embodiments and preferred embodiments of Cp, Z, A, m and
M described above also apply individually and in combination to
these preferred monocyclopentadienyl complexes.
[0085] The ligands X can result, for example, from the choice of
the corresponding starting metal compounds which are used for the
synthesis of the monocyclopentadienyl complexes, but can also be
varied afterwards. Suitable ligands X are, in particular, the
halogens fluorine, chlorine, bromine or iodine, in particular
chlorine. Alkyl radicals such as methyl, ethyl, propyl, butyl,
vinyl, allyl, phenyl or benzyl are also advantageous ligands X.
Further possible ligands X are, purely by way of example and not in
any way exhaustively, trifluoroacetate, BF.sub.4.sup.-,
PF.sub.6.sup.- and weakly coordinating or noncoordinating anions
(cf., for example, Strauss in Chem. Rev. 1993, 93, 927-942) such as
B(C.sub.6F.sub.5).sub.4.sup.-.
[0086] Amides, alkoxides, sulfonates, carboxylates and
.beta.-diketonptes are also particularly suitable ligands X.
Variation of the radicals R.sup.1 and R.sup.2 enables, for example,
physical properties such as solubility to be finely adjusted.
Possible carboorganic substituents R.sup.1-R.sup.2 are, for
example, the following: C.sub.1-C.sub.20-alkyl which may be linear
or branched, for example methyl, ethyl, n-propyl, isopropyl,
n-butyl, isobutyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl,
n-octyl, n-nonyl, n-decyl or n-dodecyl, 5- to 7-membered cycloalkyl
which may in turn bear a C.sub.6-C.sub.10-aryl group as
substituent, e.g. cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl,
cycloheptyl, cyclooctyl, cyclononyl or cyclododecyl,
C.sub.2-C.sub.20-alkenyl which may be linear, cyclic or branched
and have an internal or terminal double bond, e.g. vinyl, 1-allyl,
2-allyl, 3-allyl, butenyl, pentenyl, hexenyl, cyclopentenyl,
cyclohexenyl, cyclooctenyl or cyclooctadienyl,
C.sub.6-C.sub.20-aryl which may be substituted by further alkyl
groups and/or N- or O-containing radicals, e.g. phenyl, naphthyl,
biphenyl, anthranyl, o-, m-, p-methylphenyl, 2,3-, 2,4-, 2,5- or
2,6-dimethylphenyl, 2,3,4-, 2,3,5-, 2,3,6-, 2,4,5-, 2,4,6- or
3,4,5-trimethylphenyl, 2-methoxyphenyl, 2-N,N-dimethylaminophenyl
or arylalkyl which may be substituted by further alkyl groups, e.g.
benzyl, o-, m-, p-methylbenzyl, 1- or 2-ethylphenyl, where R.sup.1
may also be joined to R.sup.2 to form a 5- or 6-membered ring and
the organic radicals R.sup.1-R.sup.2 may also be substituted by
halogens, e.g. fluorine, chlorine or bromine. In organo-silicon
substituents SiR.sup.3.sub.3, R.sup.3 may be the same radicals as
described in more detail above for R.sup.1-R.sup.2, with two
R.sup.3 also being able to be joined to form a 5- or 6-membered
ring. Examples of substituents SiR.sup.3.sub.3 are trimethylsilyl,
triethylsilyl, butyldimethylsilyl, tributylsilyl, triallylsilyl,
triphenylsilyl and dimethylphenylsilyl. Preference is given to
using C.sub.1-C.sub.10-alkyl such as methyl, ethyl, n-propyl,
n-butyl, tert-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl and also
vinyl, allyl, benzyl and phenyl as radicals R.sup.1 and R.sup.2.
Some of these substituted ligands X are very particularly
preferably used since they are obtainable from cheap and readily
available starting materials. In a particularly preferred
embodiment X is dimethylamide, methoxide, ethoxide, isopropoxide,
phenoxide, naphthoxide, trifiate, p-toluenesulfonate, acetate, or
acetylacetonate.
[0087] The number k of the ligands X depends on the oxidation state
of the transition metal M. The number k can therefore not be
specified in general terms. The oxidation state of the transition
metals M in catalytically active complexes is usually known to a
person skilled in the art. Chromium, molybdenum and tungsten are
very probably present in the oxidation state +3, vanadium in the
oxidation state +3 or +4. However, it is also possible to use
complexes whose oxidation state does not correspond to that of the
active catalyst. Such complexes can then be appropriately reduced
or oxidized by means of suitable activators. Preference is given to
using chromium complexes in the oxidation state +3 and titanium
complexes in the oxidation state 3.
[0088] Furthermore, we have found a process for preparing
cyclopentadienyl systems of the formula (V): ##STR8## [0089] where
the variables have the following meanings: [0090] R.sup.1A-R.sup.4A
are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part,
NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2, OR.sup.6A,
OSiR.sup.6A.sub.3, SiR.sup.6A.sub.3, where the organic radicals
R.sup.1A-R.sup.4A may also be substituted by halogens and two
vicinal radicals R.sup.1A-R.sup.4A may also be joined to form a
five- or six-membered ring, and/or two vicinal radicals
R.sup.1A-R.sup.4A are joined to form a heterocycle which contains
at least one atom from the group consisting of N, P, O and S.
[0091] R.sup.6A are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-allyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
geminal radicals R.sup.6A may also be joined to form a five- or
six-membered ring, [0092] A is an unsubstituted, substituted or
fused, heteroaromatic ring system, [0093] R.sup.1B-R.sup.4B are
each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.7B.sub.3, where the organic radicals R.sup.1B-R.sup.4B may
also be substituted by halogens and two geminal vicinal radicals
R.sup.1B-R.sup.4B may also be joined to form a five- or
six-membered ring and [0094] R.sup.7B are each, independently of
one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring, [0095] M.sup.S a metal of group
1, 2 or 3 of the Periodic Table of the Elements, [0096] X.sup.S are
each, independently of one another, fluorine, chlorine, bromine,
iodine, hydrogen, C.sub.1-C.sub.10-alkyl, C.sub.2-C.sub.10-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having 1-10 carbon atoms in the
alkyl part and 6-20 carbon atoms in the aryl part, NR.sup.1R.sup.2,
OR.sup.1, SR.sup.1, SO.sub.3R.sup.1, OC(O)R.sup.1, CN, SCN,
.beta.-diketonate, CO, BF.sub.4.sup.-, PF.sub.6.sup.- or a bulky
noncoordinating anion and [0097] s 0, 1 or 2, [0098] r 1 or 2, with
the proviso that s+r is the oxidation state of M.sup.S-1, [0099]
which comprises reacting
(A-CR.sup.1BR.sup.2B-).sub.r(M.sup.SX.sup.S.sub.S).sup.+ with a
fulvene of the formula (VI) ##STR9## [0100] where the variables are
as defined above.
[0101] The variables and their preferred embodiments have already
been described above. Fulvenes have been known for a long time and
can be prepared, for example, by the method of Freiesleben, Angew.
Chem. 75 (1963), p. 576.
[0102] The X.sup.S ligands provide the negative charge to an
overall neutral cyclopentadienyl system (V) and are preferably
halogens, i.e. chlorine and bromine. The counterion
M.sup.SX.sup.S.sub.S of the cyclopentadienyl system anion in
formula (V) is the cation of the A-CR.sup.1BR.sup.2B- anion. MS is
generally a metal of group 1, 2 or 3 of the Periodic Table of the
Elements, which bears s X.sup.S ligands, so that the formal
oxidation state of M.sup.S minus s equals -1. M.sup.S may bear
further neutral ligands. Particular preference is given to M.sup.S
being lithium, sodium or potassium cations which may also bear
uncharged ligands such as amines or ethers and s is 0 and r is 1.
Particular preference is also given to M.sup.S being magnesium and
s is 1 and r is 1, e.i. M.sup.SX.sup.S.sub.S being magnesium
chloride or magnesium bromide cations which may likewise bear
further uncharged ligands.
[0103] The A-CR.sup.1BR.sup.2B- anion is usually obtained by
deprotonation of A-CR.sup.1BR.sup.2BH. Strong bases such as lithium
alkyls, sodium hydride, sodium amides, sodium alkoxides, sodium
alkyls, potassium hydride, potassium amides, potassium alkoxides,
potassium alkyls, magnesium alkyls, alkylmagnesium halides or
mixtures thereof can be used for this purpose. The molar ratio of
base to A-CR.sup.1BR.sup.2BH is usually in the range from 0.4:1 to
100:1, preferably in the range from 0.9:1 to 10:1 and particularly
preferably from 0.95:1 to 1.1:1. Examples of such deprotonations
are described in L. Brandsma, Preparative polar organometallic
chemistry 2, pp. 133-142.
[0104] As solvent for the deprotonation, it is possible to use all
aprotic solvents, in particular aliphatic and aromatic hydrocarbons
such as n-pentane, n-hexane, isohexane, n-heptane, isoheptane,
decalin, benzene, toluene, ethylbenzene or xylene or ethers such as
diethyl ether, dibutyl ether, tetrahydrofuran, dimethoxyethane or
diethylene glycol dimethyl ether and mixtures thereof. The
deprotonation can be carried out at from -100 to +160.degree. C.,
in particular from -80 to 100.degree. C. At temperatures above
40.degree. C., preference is given to using aromatic or aliphatic
solvents which contain no ethers or only small proportions of
ethers.
[0105] The unsubstituted, substituted or fused, heteroaromatic ring
system A has the same meanings as described above and bears a
CR.sup.1BR.sup.2BH group. Preferably A is of the formula IIIa or
IIIb with the CR.sup.1BR.sup.2BH group in place where Z is located.
The radicals R.sup.1B and R.sup.2B and their preferred embodiments
have likewise already been described above and is particularly
preferable hydrogen. This group is preferably located in the ortho
position relative to a heteroatom of A, in particular a nitrogen
atom if one is present in A. A-CR.sup.1BR.sup.2BH is preferably
2-methylfuran, 2,5-dimethylfuran, 2-ethyfuran, 1,2-dimethylpyrrole,
1,2,3-trimethylpyrrole, 1,3-dimethylpyrazole,
1,2-dimethylimidazole, 1-decyl-2-methylimidazole,
1-methyl-2-undecylimidazole, 2-picoline, 2-ethylpyridine,
2-propylpyridine, 2-benzylpyridine, 2,6-lutidine, 2,4-lutidine,
2,5-lutidine, 2,3-cycloheptenopyridine, 5-ethyl-2-methylpyridine,
2,4,6-collidine, 3-methylpyridazine, 4-methylpyrimidine,
4,6-dimethylpyrimidine, 2-methylpyrazine, 2-ethylpyrazine,
2,6-dimethylpyrazine, 2,5-dimethylpyrazine, 2,3-dimethylpyrazine,
2,3-diethylpyrazine, tetrahydroquinoxaline, tetramethylpyrazine,
quinaldine, 2,4-dimethylquinoline, 2,6-dimethylquinoline,
2,7-dirnethylquinoline, 2-methylquinoxaline,
2,3-dimethylquinoxaline or neocuproin.
[0106] A-CR.sup.1BR.sup.2BH is particularly preferably a group of
the formula (VIIa) or (VIIb) ##STR10## [0107] where the variables
have the following meanings: [0108] E.sup.1C-E.sup.4C are each
carbon or nitrogen, [0109] R.sup.1C-R.sup.4C are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl, part or SiR.sup.5C.sub.3, where the organic radicals
R.sup.1C-R.sup.4C may also be substituted by halogens or nitrogen
and further C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkyl aryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.5C.sub.3 groups and two vicinal radicals R.sup.1C-R.sup.4C
or R.sup.1C and R.sup.1B may also be joined to form a five- or
six-membered ring, and [0110] R.sup.5C are each, independently of
one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.5C may also be joined to
form a five- or six-membered ring, [0111] p is 0 when
E.sup.1C-E.sup.4C is nitrogen and 1 when E.sup.1C-E.sup.4C is
carbon, [0112] G.sup.1C is nitrogen, phosphorus, sulfur or oxygen,
[0113] R.sup.6C-R.sup.8C are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.9C.sub.3, where the organic radicals R.sup.6C-R.sup.8C may
also be substituted by halogens or nitrogen and further
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.9C.sub.3 groups and two vincinal radicals R.sup.6C-R.sup.8C
or R.sup.6C and Z may also be joined to form a 5- or 6-membered
ring and [0114] R.sup.9C are each, independently of one another,
hydrogen, C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl or alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
radicals R.sup.9C may also be joined to form a five- or
six-membered ring and [0115] g is 0 when G.sup.1C is sulfur or
oxygen and 1 when G.sup.1C is nitrogen or phosphorus.
[0116] In particular, 0 or 1 E.sup.1C-E.sup.4C is nitrogen and the
others are carbon. Particularly preferred A-CR.sup.1BR.sup.2BH
systems of formula VIIa are 2-picoline, 2-ethylpyridine,
2-propylpyridine, 2-benzylpyridine, 2,6-lutidine, 2,4-lutidine,
2,5-lutidine, 2,3-cycloheptenopyridine, 5-ethyl-2-methylpyridine,
2,4,6-collidine, 3-methylpyridazine, 4-methylpyrimidine,
4,6-dimethylpyrimidine, 2-methylpyrazine, 2-ethylpyrazine,
2,6-dimethylpyrazine, 2,5-dimethylpyrazine, 2,3-dimethylpyrazine,
2,3-diethylpyrazine, tetrahydroquinoxaline, tetramethylpyrazine,
quinaldine, 2,4-dimethylquinoline, 2,6-dimethylquinoline,
2,7-dimethylquinoline, 2-methylquinoxaline, 2,3-dimethylquinoxaline
or neocuproin.
[0117] Preferably G.sup.1C is nitrogen. Particularly preferred
A-CR.sup.1BR.sup.2BH systems of formula VIIb are
2-methyl-(1,3-oxazolyl), 2-methyl-(benzoxazolyl),
2-methyl-(1,3-thiazolyl), 2-methyl-(benzothiazolyl),
2-methyl-imidazolyl, 1,2-dimethyl-imidazolyl),
1-butyl-2-methyl-imidazolyl, 1-benzyl-2-methyl-imidazolyl,
2-methyl-1-phenyl-imidazolyl or 2-methyl-benzimidazolyl.
[0118] The A-CR.sup.1BR.sup.2B- anion formed by deprotonation can
be isolated and reacted with the fulvene (VI), but is preferably
reacted with the fulvene (VI) without further isolation. As
solvents for the further reaction, it is possible to use all
aprotic solvents, in particular aliphatic and aromatic hydrocarbons
such as n-pentane, n-hexane, isohexane, n-heptane, isoheptane,
decalin, benzene, toluene, ethylbenzene or xylene or ethers such as
diethyl ether, dibutyl ether, tetrahydrofuran, dimethoxyethane or
diethylene glycol dimethyl ether and mixtures thereof The
subsequent reaction can be carried out at from -100 to +160.degree.
C., preferably from -80 to 100.degree. C. and particularly
preferably from 0 to 60.degree. C. At temperatures above 40.degree.
C., preference is given to using aromatic or aliphatic solvents
which contain no ethers or only small proportions of ethers. The
molar ratio of the A in
(A-CR.sup.1BR.sup.2B-)r(M.sup.SX.sup.S.sub.S).sup.+ to fulven (VI)
is usually from 0.1:1 to 10:1, preferably 0.7:1 to 1.3:1 and
particularly preferable 1:1 to 1.1:1.
[0119] The cyclopentadienyl system anions (V) obtained in this way
can then be reacted further with the appropriate transition metal
compound, e.g. chromium trichloride-tris-(tetrahydrofuran), to give
the corresponding monocyclopentadienyl complex (A).
[0120] This process is particularly preferred to the other
processes described. It can be used to synthesize a wide range of
ligand structures. It is especially suitable for C.sub.2-bridged
ligand systems with A of the formula IIIa and IIIb. The yields with
this process are very high and it is particularly suitable to
upscale to larger amounts. Consequently the costs for this process
are low.
[0121] Furthermore, we have found a process for preparing
cyclopentadienyl systems of the formula (VIII): ##STR11## [0122]
where the variables have the following meanings: [0123]
E.sup.6A-E.sup.10A are each carbon or not more than one E.sup.6A to
E.sup.10A is phosphorus, where four adjacent E.sup.6A-E.sup.10A
form a conjugated diene system and the remaining E.sup.6A-E.sup.10A
additionally bears a hydrogen atom, [0124] R.sup.1A-R.sup.4A are
each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part,
NR.sup.6A.sub.2, N(SiR.sup.6A.sub.3).sub.2, OR.sup.6A,
OSiR.sup.6A.sub.3, SiR.sup.6A.sub.3, where the organic radicals
R.sup.1A-R.sup.4A may also be substituted by halogens and two
vicinal radicals R.sup.1A-R.sup.4A may also be joined to form a
five- or six-membered ring, and/or two vicinal radicals
R.sup.1A-R.sup.4A are joined to form a heterocycle which contains
at least one atom from the group consisting of N, P, O and S,
[0125] R.sup.6A are each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part and two
geminal radicals R.sup.6A may also be joined to form a five- or
six-membered ring, [0126] A is an unsubstituted, substituted or
fused, heteroaromatic ring system, [0127] R.sup.1B-R.sup.4B are
each, independently of one another, hydrogen,
C.sub.1-C.sub.20-alkyl, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part or
SiR.sup.7B.sub.3, where the organic radicals R.sup.1B-R.sup.4B may
also be substituted by halogens and two geminal or vicinal radicals
R.sup.1B-R.sup.4B may also be joined to form a five- or
six-membered ring, and [0128] R.sup.7B are each, independently of
one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sup.7B may also be joined to
form a five- or six-membered ring, which comprises reacting
(A-CR.sup.1BR.sup.2B-).sub.r(M.sup.SX.sup.S.sub.S).sup.+ with a
cyclopentadienyl system of the formula (IX) ##STR12## [0129] where
the variables are as defined above and [0130] Q is a leaving group,
in particular chlorine, bromine, iodine, tosylate or triflate.
[0131] The preparation of the A-CR.sup.1BCR.sup.2B- anions and
their preferred embodiments have been described above and also
apply in this process.
[0132] The cyclopentadienyl system (IX) can, for example, be
prepared by reaction of the corresponding cyclopentadienyl system
anion formed by removal of a single proton on one of the
E.sup.6A-E.sup.10A of a compound of the formula (IX) in which the
group SiR.sup.1BR.sup.2BQ is replaced by hydrogen with
SiR.sup.1BR.sup.2BQ.sub.2, where Q can be identical or different
and are each a leaving group, in particular chlorine, bromine,
iodine, tosylate or trifiate. Such syntheses are described, for
example, in EP-A-659757.
[0133] The A-CR.sup.1BR.sup.2B- anion formed by deprotonation can
be isolated and reacted with the cyclopentadienyl system (DC) but
is preferably reacted with the cyclopentadienyl system (IX) without
further isolation. As solvents, it is possible to use all aprotic
solvents, in particular aliphatic and aromatic hydrocarbons such as
n-pentane, n-hexane, isohexane, n-heptane, isoheptane, decalin,
benzene, toluene, ethylbenzene or xylene or ethers such as diethyl
ether, dibutyl ether, tetrahydrofuran, dimethoxyethane or
diethylene glycol dimethyl ether and mixtures thereof. The reaction
can be carried out at from -100 to +160.degree. C., preferably from
-80 to 100.degree. C. and particularly preferably from 0 to
60.degree. C. At temperatures above 40.degree. C., preference is
given to using aromatic or aliphatic solvents which contain no
ethers or only small proportions of ethers.
[0134] The cyclopentadienyl system (VIII) obtained in this way can
then be deprotonated by customary methods and be reacted further
with the appropriate transition metal compound, e.g. chromium
trichloride-tris(tetrahydrofuran), to give the corresponding
monocyclopentadienyl complex (A). Furthermore, the cyclopentadienyl
system (VII) can also, for example, be reacted directly with
chromium amides to give the monocyclopentadienyl complex (A), using
a method analogous to that in EP-A-742 046.
[0135] The monocyclopentadienyl complexes of the present invention
can be used either alone or together with further components as
catalyst system for olefin polymerization. We have also found
catalyst systems for olefin polymerization comprising [0136] A) at
least one monocyclopentadienyl complex according to the present
invention, [0137] B) optionally, an organic or inorganic support,
[0138] C) optionally, one or more activating compounds, [0139] D)
optionally, one or more catalysts suitable for olefin
polymerization and [0140] E) optionally, one or more metal
compounds containing a metal of group 1, 2 or 13 of the Periodic
Table.
[0141] Thus, more than one of the monocyclopentadienyl complexes of
the present invention can simultaneously be brought into contact
with the olefin or olefins to be polymerized. This has the
advantage that a wider range of polymers can be produced in this
way. For example, bimodal products can be prepared in this way.
[0142] For the monocyclopentadienyl complexes of the present
invention to be able to be used in polymerization processes in the
gas phase or in suspension, it is often advantageous to use the
metallocenes in the form of a solid, i.e: for them to be applied to
a solid support B). Furthermore, the supported monocyclopentadienyl
complexes have a high productivity. The monocyclopentadienyl
complexes of the present invention can therefore also, if desired,
be immobilized on an organic or inorganic support B) and used in
supported form in the polymerization. This enables, for example,
deposits in the reactor to be avoided and the polymer morphology to
be controlled. As support materials, preference is given to using
silica gel, magnesium chloride, aluminum oxide, mesoporous
materials, aluminosilicates, hydrotalcites and organic polymers
such as polyethylene, polypropylene, polystyrene,
polytetrafluoroethylene or polar functionalized polymers, e.g.
copolymers of ethene and acrylic esters, acrolein or vinyl
acetate.
[0143] Particular preference is given to a catalyst system
comprising a monocyclopentadienyl complex according to the present
invention and at least one activating compound C) and also a
support component B).
[0144] To obtain such a supported catalyst system, the unsupported
catalyst system can be reacted with a support component B). The
order in which the support component B), the monocyclopentadienyl
complex A) of the present invention and the activating compound C)
are combined is in principle immaterial. The monocyclopentadienyl
complex A) of the present invention and the activating compound C)
can be fixed to the support independently of one another or
simultaneously. After the individual process steps, the solid can
be washed with suitable inert solvents such as aliphatic or
aromatic hydrocarbons.
[0145] In a preferred method of preparing the supported catalyst
system, at least one of the monocyclopentadienyl complexes of the
present invention is brought into contact with at least one
activating compound C) in a suitable solvent, preferably giving a
soluble reaction product, an adduct or a mixture. The preparation
obtained in this way is then mixed with the dehydrated or
passivated support material, the solvent is removed and the
resulting supported monocyclopentadienyl complex catalyst system is
dried to ensure that all or most of the solvent has been removed
from the pores of the support material. The supported catalyst is
obtained as a free-flowing powder. Examples of the industrial
implementation of the above process are described in WO 96/00243,
WO 98/40419 or WO 00/05277. A further preferred embodiment
comprises firstly. applying the activating compound C) to the
support component B) and subsequently bringing this supported
compound into contact with the monocyclopentadienyl complex A) of
the present invention.
[0146] As support component B), preference is given to using finely
divided supports which can be any organic or inorganic solids. In
particular, the support component B) can be a porous support such
as talc, a sheet silicate such as montmorillonite, mica, and
inorganic oxide or a finely divided polymer powder (e.g. a
polyolefin or a polymer having polar functional groups).
[0147] The support materials used preferably have a specific
surface area in the range from 10 to 1 000 m.sup.2/g, a pore volume
in the range from 0.1 to 5 ml/g and a mean particle size of from 1
to 500 .mu.m. Preference is given to supports having a specific
surface area in the range from 50 to 700 m.sup.2/g, a pore volume
in the range from 0.4 to 3.5 ml/g and a mean particle size in the
range from 5 to 350 .mu.m. Particular preference is given to
supports having a specific surface area in the range from 200 to
550 m.sup.2/g, a pore volume in the range from 0.5 to 3.0 ml/g and
a mean particle size of from 10 to 150 .mu.m.
[0148] The inorganic support can be subjected to a thermal
treatment, e.g. to remove adsorbed water. Such a drying treatment
is generally carried out at from 80 to 300.degree. C., preferably
from 100 to 200.degree. C. Drying at from 100 to 200.degree. C. is
preferably carried out under reduced pressure and/or under a
blanket of inert gas (e.g. nitrogen), or the inorganic support can
be calcined at from 200 to 1 000.degree. C. to produce the desired
structure of the solid and/or the desired OH concentration on the
surface. The support can also be treated chemically using customary
desiccants such as metal alkyls, preferably aluminum alkyls,
chlorosilanes or SiCl.sub.4, or else methylaluminoxane. Appropriate
treatment methods are described, for example, in WO 00/31090.
[0149] The inorganic support material can also be chemically
modified. For example, the treatment of silica gel with
NH.sub.4SiF.sub.6 or other fluorinating agents leads to
fluorination of the silica gel surface, or treatment of silica gels
with silanes containing nitrogen-, fluorine- or sulfur-containing
groups leads to correspondingly modified silica gel surfaces.
[0150] Organic support materials such as finely divided polyolefin
powders (e.g. polyethylene, polypropylene or polystyrene) can also
be used and are preferably likewise freed of adhering moisture,
solvent residues or other impurities by appropriate purification
and drying operations before use. It is also possible to use
functionalized polymer supports, e.g. ones based on polystyrene,
polyethylene or polypropylene, via whose functional groups, for
example ammonium or hydroxy groups, at least one of the catalyst
components can be fixed.
[0151] Inorganic oxides suitable as support component B) may be
found among the oxides of elements of groups 2, 3, 4, 5, 13, 14, 15
and 16 of the Periodic Table of the Elements. Examples of oxides
preferred as supports include silicon dioxide, aluminum oxide and
mixed oxides of the elements calcium, aluminum, silicon, magnesium
or titanium and also corresponding oxide mixtures. Other inorganic
oxides which can be used alone or in combination with the
abovementioned preferred oxidic supports are, for example, MgO,
CaO, AlPO.sub.4, ZrO.sub.2, TiO.sub.2, B.sub.2O.sub.3 or mixtures
thereof.
[0152] As solid support materials B) for catalysts for olefin
polymerization, preference is given to using silica gels since
particles whose size and structure make them suitable as supports
for olefin polymerization can produced from this material.
Spray-dried silica gels comprising spherical agglomerates of
smaller granular particles, i.e. primary particles, have been found
to be particularly useful. These silica gels can be dried and/or
calcined before use.
[0153] Further preferred supports B) are hydrotalcites and calcined
hydrotalcites. In mineralogy, hydrotalcite is a natural mineral
having the ideal formula
Mg.sub.6Al.sub.2(OH).sub.16CO.sub.3.4H.sub.2O whose structure is
derived from that of brucite Mg(OH).sub.2. Brucite crystallizes in
a sheet structure with the metal ions in octahedral holes between
two layers of close-packed hydroxyl ions, with only every second
layer of the octahedral holes being occupied. In hydrotalcite, some
magnesium ions are replaced by aluminum ions, as a result of which
the packet of layers gains a positive charge. This is compensated
by the anions which are located together with water of
crystallization in the layers in between.
[0154] Such sheet structures are found not only in
magnesium-aluminum hydroxides, but also generally in mixed metal
hydroxides of the formula
M(II).sub.2x.sup.2+M(III).sub.2.sup.3+(OH).sub.4x+4.A.sub.2/n.sup.n-.zH.s-
ub.2O which have a sheet structure and in which M(II) is a divalent
metal such as Mg, Zn, Cu, Ni, Co, Mn, Ca and/or Fe and M(III) is a
trivalent metal such as Al, Fe, Co, Mn, La, Ce and/or Cr, x is from
0.5 to 10 in steps of 0.5, A is an interstitial anion and n is the
charge on the interstitial anion which can be from 1 to 8, usually
from 1 to 4, and z is an integer from 1 to 6, in particular from 2
to 4. Possible interstitial anions are organic anions such as
alkoxide anions, alkyl ether sulfates, aryl ether sulfates or
glycol ether sulfates, inorganic anions such as, in particular,
carbonate, hydrogencarbonate, nitrate, chloride, sulfate or
B(OH).sub.4.sup.- or polyoxo metal anions such as
Mo.sub.7O.sub.24.sup.6- or V.sub.10O.sub.28.sup.6-. However, a
mixture of a plurality of such anions can also be present.
[0155] Accordingly, all such mixed metal hydroxides having a sheet
structure should be regarded as hydrotalcites for the purposes of
the present invention.
[0156] Calcined hydrotalcites can be prepared from hydrotalcites by
calcination, i.e. heating, by means of which the desired hydroxyl
group content can be set. In addition, the crystal structure also
changes. The preparation of the calcined hydrotalcites used
according to the present invention is usually carried out at
temperatures above 180.degree. C. Preference is given to
calcination for from 3 to 24 hours at from 250.degree. C. to
1000.degree. C., in particular from 400.degree. C. to 700.degree.
C. It is possible for air or inert gas to be passed over the solid
during calcination or for a vacuum to be applied.
[0157] On heating, the natural or synthetic hydrotalcites firstly
give off water, i.e. drying occurs. On further heating, the actual
calcination, the metal hydroxides are converted into the metal
oxides by elimination of hydroxyl groups and interstitial anions;
OH groups or interstitial anions such as carbonate can also still
be present in the calcined hydrotalcites. A measure of this is the
loss on ignition. This is the weight loss experienced by a sample
which is heated in two steps firstly for 30 minutes at 200.degree.
C. in a drying oven and then for 1 hour at 950.degree. C. in a
muffle furnace.
[0158] The calcined hydrotalcites used as component B) are thus
mixed oxides of the divalent and trivalent metals M(II) and M(III),
with the molar ratio of M(II) to M(III) generally being in the
range from 0.5 to 10, preferably from 0.75 to 8 and in particular
from 1 to 4. Furthermore, normal amounts of impurities, for example
Si, Fe, Na, Ca or Ti and also chlorides and sulfates, can also be
present.
[0159] Preferred calcined hydrotalcites B) are mixed oxides in
which M(II) is magnesium and M(III) is aluminum. Such
aluminum-magnesium mixed oxides are obtainable from Condea Chemie
GmbH (now Sasol Chemie), Hamburg, under the trade name Puralox
Mg.
[0160] Preference is also given to calcined hydrotalcites in which
the structural transformation is complete or virtually complete.
Calcination, i.e. transformation of the structure, can be
confirmed, for example, by means of X-ray diffraction patterns.
[0161] The hydrotalcites, calcined hydrotalcites or silica gels
employed are generally used as finely divided powders having a mean
particle diameter d.sub.50 of from 5 to 200 .mu.m, preferably from
10 to 150 .mu.m, particularly preferably from 15 to 100 .mu.m and
in particular from 20 to 70 .mu.m, and usually have pore volumes of
from 0.1 to 10 cm.sup.3/g, preferably from 0.2 to 5 cm.sup.3/g, and
specific surface areas of from 30 to 1 000 m.sup.2/g, preferably
from 50 to 800 m.sup.2/g and in particular from 100 to 600
m.sup.2/g. The monocyclopentadienyl complexes of the present
invention are preferably applied in such an amount that the
concentration of monocyclopentadienyl complexes in the finished
catalyst system is from 5 to 200 .mu.mol, preferably from 20 to 100
.mu.mol and particularly preferably from 25 to 70 .mu.mol per g of
support B).
[0162] Some of the monocyclopentadienyl complexes of the present
invention have little polymerization activity on their own and are
then brought into contact with an activator, viz the component C),
to be able to display good polymerization activity. For this
reason, the catalyst system optionally further comprises, as
component C), one or more activating compounds, preferably at least
one cation-forming compound C).
[0163] Suitable compounds C) which are able to react with the
monocyclopentadienyl complex A) to convert it into a catalytically
active, or more active, compound are, for example, compounds such
as an aluminoxane, a strong uncharged Lewis acid, an ionic compound
having a Lewis-acid cation or an ionic compound containing a
Bronsted acid as cation.
[0164] As aluminoxanes, it is possible to use, for example, the
compounds described in WO 00/31090. Particularly useful
aluminoxanes are open-chain or cyclic aluminoxane compounds of the
formula (X) or (XI) ##STR13## where R.sup.1D-R.sup.4D are each,
independently of one another, a C.sub.1-C.sub.6-alkyl group,
preferably a methyl, ethyl, butyl or isobutyl group, and 1 is an
integer from 1 to 30, preferably from 5 to 25.
[0165] A particularly useful aluminoxane compound is
methylaluminoxane.
[0166] These oligomeric aluminoxane compounds are usually prepared
by controlled reaction of a solution of trialkylaluminum with
water. In general, the oligomeric aluminoxane compounds obtained in
this way are in the form of mixtures of both linear and cyclic
chain molecules of various lengths, so that 1 is to be regarded as
a mean. The aluminoxane compounds can also be present in admixture
with other metal alkyls, usually aluminum alkyls. Aluminoxane
preparations suitable as component C) are commercially
available.
[0167] Furthermore, modified aluminoxanes in which some of the
hydrocarbon radicals have been replaced by hydrogen atoms or
alkoxy, aryloxy, siloxy or amide radicals can also be used as
component C) in place of the aluminoxane compounds of the formula
(X) or (XI).
[0168] It has been found to be advantageous to use the
monocyclopentadienyl complexes A) and the aluminoxane compounds in
such amounts that the atomic ratio of aluminum from the aluminoxane
compounds including any aluminum alkyl still present to the
transition metal from the monocyclopentadienyl complex A) is in the
range from 1:1 to 1 000:1, preferably from 10:1 to 500:1 and in
particular in the range from 20:1 to 400:1.
[0169] A further class of suitable activating components C) are
hydroxyaluminoxanes. These can be prepared, for example, by
addition of from 0.5 to 1.2 equivalents of water, preferably from
0.8 to 1.2 equivalents of water, per equivalent of aluminum to an
alkylaluminum compound, in particular triisobutylaluminum, at low
temperatures, usually below 0.degree. C. Such compounds and their
use in olefin polymerization are described, for example, in WO
00/24787. The atomic ratio of aluminum from the hydroxyaluminoxane
compound to the transition metal from the monocyclopentadienyl
complex A) is usually in the range from 1:1 to 100:1, preferably
from 1:1 to 50:1 and in particular in the range from 20:1 to 40:1.
Preference is given to using a monocyclopentadienyl metal dialkyl
compound A).
[0170] As strong, uncharged Lewis acids, preference is given to
compounds of the formula (XII) M.sup.2DX.sup.1DX.sup.2DX.sup.3D
(XII) where [0171] M2D is an element of group 13 of the Periodic
Table of the Elements, in particular B, Al or Ga, preferably B,
[0172] X.sup.1D, X.sup.2D and X.sup.3D are each hydrogen,
C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.15-aryl, alkylaryl,
arylalkyl, haloalkyl or haloaryl each having from 1 to 10 carbon
atoms in the alkyl radical and from 6 to 20 carbon atoms in the
aryl radical or fluorine, chlorine, bromine or iodine, in
particular haloaryls, preferably pentafluorophenyl.
[0173] Further examples of strong, uncharged Lewis acids are given
in WO 00/31090. Compounds of this type which are particularly
useful as component C) are boranes and boroxins such as
trialkylborane, triarylborane or trimethylboroxin. Particular
preference is given to using boranes which bear at least two
perfluorinated aryl radicals. Particular preference is given to
compounds of the formula (XII) in which X.sup.1D, X.sup.2D and
X.sup.3D are identical, preferably
tris(pentafluorophenyl)borane.
[0174] Suitable compounds C) are preferably prepared by reaction of
aluminum or boron compounds of the formula (XII) with water,
alcohols, phenol derivatives, thiophenol derivatives or aniline
derivatives, with halogenated and especially perfluorinated
alcohols and phenols being of particular importance. Examples of
particularly useful compounds are pentafluorophenol,
1,1-bis(pentafluorophenyl)methanol and
4-hydroxy-2,2',3,3',4,4',5,5',6,6'-noafluorobiphenyl. Examples of
combinations of compounds of the formula (XII) with Bronsted acids
are, in particular, trimethylaluminum/pentafluorophenol,
trimethylaluminum/1-bis(pentafluorophenyl)methanol,
trimethylaluminum/4-hydroxy-2,2',3,3',4,4',5,5',6,6'-nonafluorobiphenyl,
triethylaluminum/pentafluorophenol and
triisobutylaluminum/pentafluorophenol and
triethylaluminum/4,4'-dihydroxy-2,2',3,3',5,5',6,6'-octafluorobiphenyl
hydrate.
[0175] In further suitable aluminum and boron compounds of the
formula (XII), R.sup.1D is an OH group. Examples of compounds of
this type are boronic acids and borinic acids, in particular
borinic acids having perfluorinated aryl radicals, for example
(C.sub.6H.sub.5).sub.2BOH.
[0176] Strong uncharged Lewis acids suitable as activating
compounds C) also include the reaction products of a boronic acid
with two equivalents of an aluminum trialkyl or the reaction
products of an aluminum trialkyl with two equivalents of an acidic
fluorinated, in particular perfluorinated, hydrocarbon compound
such as pentafluorophenol or bis(pentafluorophenyl)borinic
acid.
[0177] The suitable ionic compounds having Lewis acid cations
include salt-like compounds of the cation of the formula (XIII)
[((M.sup.3D).sup.a+)Q.sub.1Q.sub.2. . . Q.sub.z].sup.d+ (XIII)
where [0178] M.sup.3D is an element of groups 1 to 16 of the
Periodic Table of the Elements, [0179] Q.sub.1 to Q.sub.z are
singly negatively charged groups such as C.sub.1-C.sub.28-alkyl,
C.sub.6-C.sub.15-aryl, alkylaryl, arylalkyl, haloalkyl, haloaryl
each having from 6 to 20 carbon atoms in the aryl radical and from
1 to 28 carbon atoms in the alkyl radical,
C.sub.3-C.sub.10-cycloalkyl which may bear C.sub.1-C.sub.10-alkyl
groups as substituents, halogen, C.sub.1-C.sub.28-alkoxy,
C.sub.6-C.sub.15-aryloxy, silyl or mercaptyl groups, [0180] a is an
integer from 1 to 6 and [0181] z is an integer from 0 to 5, [0182]
d corresponds to the difference a-z, but d is greater than or equal
to 1.
[0183] Particularly useful cations are carbonium cations, oxonium
cations and sulfonium cations and also cationic transition metal
complexes. Particular mention may be made of the triphenylmethyl
cation, the silver cation and the 1,1'-dimethylferrocenyl cation.
They preferably have noncoordinating counterions, in particular
boron compounds as are also mentioned in WO 91/09882, preferably
tetrakis(pentafluorophenyl)borate.
[0184] Salts having noncoordinating anions can also be prepared by
combining a boron or aluminum compound, e.g. an aluminum alkyl,
with a second compound which can react to link two or more boron or
aluminum atoms, e.g. water, and a third compound which forms an
ionizing ionic compound with the boron or aluminum compound, e.g.
triphenylchloromethane, or optionally a base, preferably an organic
nitrogen-containing base, for example an amine, an aniline
derivative or a nitrogen heterocycle. In addition, a fourth
compound which likewise reacts with the boron or aluminum compound,
e.g. pentafluorophenol, can be added.
[0185] Ionic compounds containing Bronsted acids as cations
preferably likewise have noncoordinating counterions. As Bronsted
acid, particular preference is given to protonated amine or aniline
derivatives. Preferred cations are N,N-dimethylanilinium,
N,N-dimethylcyclohexylammonium and N,N-dimethylbenzylammonium and
also derivatives of the latter two.
[0186] Compounds containing anionic boron heterocycles as are
described in WO 97/36937 are also suitable as component C), in
particular dimethylanilinium boratabenzene or trityl
boratabenzene.
[0187] Preferred ionic compounds C) contain borates which bear at
least two perfluorinated aryl radicals. Particular preference is
given to N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate
and in particular N,N-dimethylcyclohexylammonium
tetralkis(pentafluorophenyl)borate, N,N-dimethylbenzylaammonium
tetrakis(pentafluorophenyl)borate or trityl
tetrarispentafluorophenylborate.
[0188] It is also possible for two or more borate anions to be
joined to one another, as in the dianion
[(C.sub.6P.sub.5).sub.2B--C.sub.6F.sub.4--B(C.sub.6F.sub.5).sub.2].sup.2--
, or the borate anion can be bound via a bridge to a suitable
functional group on the support surface.
[0189] Further suitable activating compounds C) are listed in WO
00/31090.
[0190] The amount of strong, uncharged Lewis acids, ionic compounds
having Lewis-acid cations or ionic compounds containing Bronsted
acids as cations is preferably from 0.1 to 20 equivalents, more
preferably from 1 to 10 equivalents, based on the
mono-cyclopentadienyl complex A).
[0191] Suitable activating compounds C) also include boron-aluminum
compounds such as di[bis(pentafluorophenyl)boroxy]methylalane.
Examples of such boron-aluminum compounds are those disclosed in WO
99/06414.
[0192] It is also possible to use mixtures of all the
abovementioned activating compounds C). Preferred mixtures comprise
aluminoxanes, in particular methylaluminoxane, and an ionic
compound, in particular one containing the
tetrakis(pentafluorophenyl)borate anion, and/or a strong uncharged
Lewis acid, in particular tris(pentafluorophenyl)borane.
[0193] Both the monocyclopentadienyl complexes A) and the
activating compounds C) are preferably used in a solvent,
preferably an aromatic hydrocarbon having from 6 to 20 carbon
atoms, in particular xylenes, toluene, pentane, hexane, heptane or
a mixture thereof.
[0194] A further possibility is to use an activating compound C)
which can simultaneously be employed as support B). Such systems
are obtained, for example, from an inorganic oxide by treatment
with zirconium alkoxide and subsequent chlorination, for example by
means of carbon tetrachloride. The preparation of such systems is
described, for example, in WO 01/41920.
[0195] A likewise broad product spectrum can be achieved by use of
the monocyclopentadienyl complexes A) of the present invention in
combination with at least one further catalyst D) which is suitable
for the polymerization of olefins. It is therefore possible to use
one or more catalysts suitable for olefin polymerization as
optional component D) in the catalyst system. Possible catalysts D)
are, in particular, classical Ziegler-Natta catalysts based on
titanium and classical Phillips catalysts based on chromium
oxides.
[0196] Possible components D) are in principle all compounds of
transition metals of groups III to XII of the Periodic Table or the
lanthanides which contain organic groups and preferably form active
catalysts for olefin polymerization after reaction with the
components C) in the presence of A) and optionally B) and/or E).
These are usually compounds in which at least one monodentate or
polydentate ligand is bound to the central atom via a sigma or pi
bond. Possible ligands include both ligands containing
cyclopentadienyl groups and ligands which are free of
cyclopentadienyl groups. A large number of such compounds D)
suitable for olefin polymerization are described in Chem. Rev.
2000, vol, 100, No. 4. Furthermore, multinuclear cyclopentadienyl
complexes are also suitable for olefin polymerization.
[0197] Particularly well-suited components D) include compounds
having at least one cyclopentadienyl ligand, which are generally
referred to a metallocene complexes. 10 Particularly useful
metallocene complexes are those of the formula (XIV) ##STR14##
[0198] where the substituents and indices have the following
meanings: [0199] M.sup.1E is titanium, zirconium, hafnium,
vanadium, niobium, tantalum, chromium, molybdenum or tungsten, or
an element of group 3 of the Periodic Table and the lanthanides,
[0200] X.sup.E is fluorine, chlorine, bromine, iodine, hydrogen,
C.sub.1-C.sub.10-alkyl, C.sub.2-C.sub.10-alkenyl,
C.sub.6-C.sub.15-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and from 6 to 20 carbon atoms in the aryl part,
--OR.sup.6E or --NR.sup.6ER.sup.7E, or two radicals X.sup.E form a
substituted or unsubstituted diene ligand,in particular a 1,3-diene
ligand, and the radicals X.sup.E are identical or different and may
be joined to one another, [0201] E.sup.1E-E.sup.5E are each carbon
or not more than one E.sup.1E to E.sup.5E is phosphorus or
nitrogen, preferably carbon, [0202] t is 1, 2 or 3 and is such
that, depending on the valence of M.sup.1E, the metallocene complex
of the formula (XIV) is uncharged, [0203] where [0204] R.sup.6E and
R.sup.7E are each C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.15-aryl,
alkylaryl, arylalkyl, fluoroalkyl or fluoroaryl, each having from 1
to 10 carbon atoms in the alkyl radical and from 6 to 20 carbon
atoms in the aryl radical, and [0205] R.sup.1E to R.sup.5E are
each, independently of one another, hydrogen,
C.sub.1-C.sub.22-alkyl, 5- to 7-membered cycloalkyl or cycloalkenyl
which may in turn bear C.sub.1-C.sub.10-alkyl groups as
substituents, C.sub.2-C.sub.22-alkenyl, C.sub.6-C.sub.22-aryl,
arylalkyl having from 1 to 16 carbon atoms in the alkyl part and
6-21 carbon atoms in the aryl part, NR.sup.8E.sub.2,
N(SiR.sup.8E.sub.3).sub.2, OR.sup.8E, OSiR.sup.8E.sub.3,
SiR.sup.8E.sub.3, where the organic radicals R.sup.1E-R.sup.5E may
also be substituted by halogens and/or two radicals
R.sup.1E-R.sup.5E, in particular vicinal radicals, may also be
joined to form a 5-, 6- or 7-membered ring, and/or two vicinal
radicals R.sup.1E-R.sup.5E may be joined to form a five-, six- or
seven-membered heterocycle which contains at least one atom from
the group consisting of N, P, O and S, where [0206] R.sup.8E can be
identical or different and are each C.sub.1-C.sub.10-alkyl,
C.sub.3-C.sub.10-cycloalkyl, C.sub.6-C.sub.15-aryl,
C.sub.1-C.sub.4-alkoxy or C.sub.6-C.sub.10-aryloxy and [0207]
Z.sup.1E is as defined for X.sup.E or is ##STR15## [0208] where the
radicals [0209] R.sup.9E to R.sup.13E are each, independently of
one another, hydrogen, C.sub.1-C.sub.22-alkyl, 5- to 7-membered
cycloalkyl or cycloalkenyl which may in turn bear
C.sub.1-C.sub.10-alkyl groups as substituents,
C.sub.2-C.sub.22-alkenyl, C.sub.6-C.sub.22-aryl, arylalkyl having
from 1 to 16 carbon atoms in the alkyl part and 6-21 carbon atoms
in the aryl pat NR.sup.14E.sub.2, N(SiR.sup.14E.sub.3).sub.2,
OR.sup.14E, OSiR.sup.14E.sub.3, SiR.sup.14E.sub.3, where the
organic radicals R.sup.9ER.sup.13E may also be substituted by
halogens and/or two radicals R.sup.9E-R.sup.13E, in particular
vicinal radicals, may also be joined to form a five-, six- or
seven-membered ring, and/or two vicinal radicals R.sup.9E-R.sup.13E
may be joined to form a five-, six- or seven-membered heterocycle
which contains at least one atom from the group consisting of N, P,
O and S, where [0210] R.sup.14E are identical or different and are
each C.sub.1-C.sub.10-alkyl, C.sub.3-C.sub.10-cycloalkyl,
C.sub.6-C.sub.15-aryl, C.sub.1-C.sub.4-alkoxy or
C.sub.6-C.sub.10-aryloxy, [0211] E.sup.6E-E.sup.10F are each carbon
or not more than one E.sup.6E to E.sup.10E is phosphorus or
nitrogen, preferably carbon, [0212] or the radicals R.sup.4E and
Z.sup.1E together form an --R.sup.15E.sub.v-A.sup.E-group in which
[0213] R.sup.15E is ##STR16## .dbd.BR.sup.16E,
.dbd.BNR.sup.16ER.sup.17E, =AIR.sup.16E, --Ge--, --Sn--, --O--,
--S--, .dbd.SO, .dbd.SO.sub.2, .dbd.NR.sup.16E, .dbd.CO,
.dbd.PR.sup.16E or .dbd.P(O)R.sup.16E, where [0214] R.sup.16E,
R.sup.17E and R.sup.18E are identical or different and are each a
hydrogen atom, a halogen atom, a trimethylsilyl group, a
C.sub.1-C.sub.10-alkyl group, a C.sub.1-C.sub.10-fluoroalkyl group,
a C.sub.6-C.sub.10-fluoroaryl group, a C.sub.6-C.sub.10-aryl group,
a C.sub.1-C.sub.10-alkoxy group, a C.sub.7-C.sub.15-alkylaryloxy
group, a C.sub.2-C.sub.10-alkenyl group, a
C.sub.7-C.sub.40-arylalkyl group, a C.sub.8-C.sub.40-arylalkenyl
group or a C.sub.7-C.sub.40-alkylaryl group or two adjacent
radicals together with the atoms connecting them form a saturated
or unsaturated ring having from 4 to 15 carbon atoms, and [0215]
M.sup.2B is silicon, germanium or tin, preferably silicon, [0216]
A.sup.1E is ##STR17## --NR.sup.19E.sub.2, --PR.sup.19E.sub.2 or an
unsubstituted, substituted or fused, heterocyclic ring system,
where [0217] R.sup.19E are each, independently of one another,
C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.15-aryl,
C.sub.3-C.sub.10-cycloalkyl, C.sub.7-C.sub.18-alkylaryl or
Si(R.sup.20E).sub.3, [0218] R.sup.20E is hydrogen,
C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.15-aryl which may in turn
bear C.sub.1-C.sub.4-alkyl groups as substituents or
C.sub.3-C.sub.10-cycloalkyl, [0219] V is 1 or when A.sup.1E is an
unsubstituted, substituted or fused, heterocyclic ring system may
also be 0, or the radicals R.sup.4E and R.sup.12E together form an
--R.sup.15E-- group.
[0220] A.sup.1E together with the bridge R.sup.15E can, for
example, form an amine, ether, thioether or phosphine. However,
A.sup.1E may also be an unsubstituted, substituted or fused,
heterocyclic aromatic ring system which can contain heteroatoms
from the group consisting of oxygen, sulfur, nitrogen and
phosphorus in addition to carbon atoms in the ring. Examples of
five-membered heteroaryl groups which can contain from 1 to 4
nitrogen atoms and/or a sulfur or oxygen atom as ring atoms in
addition to carbon atoms are 2-furyl, 2-thienyl, 2-pyrrolyl,
3-isoxazolyl, 5-isoxazolyl, 3-isothiazolyl, 5-isothiazolyl,
1-pyrazolyl, 3-pyrazolyl, 5-pyrazolyl, 2-oxazolyl, 4-oxazolyl,
5-oxazolyl, 2-thiazolyl, 4-thiazolyl, 5-thiazolyl, 2-imidazolyl,
4-imidazolyl, 5-imidazolyl, 1,2,4-oxadiazol-3-yl,
1,2,4-oxadiazol-5-yl, 1,3,4-oxadiazol-2-yl or 1,2,4-triazol-3-yl.
Examples of 6-membered heteroaryl groups, which can contain from 1
to 4 nitrogen atoms and/or a phosphorus atom, are 2-pyridinyl,
2-phosphabenzolyl, 3-pyridazinyl, 2-pyrimidinyl, 4-pyrimidinyl,
2-pyrazinyl, 1,3,5-triazin-1-yl and 1,2,4-triazin-3-yl,
1,2,4-triazin-5-yl and 1,2,4-triazin-6-yl. The 5-membered and
6-membered heteroaryl groups can also be substituted by
C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.10-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-10 carbon atoms
in the aryl part, trialkylsilyl or halogens such as fluorine,
chlorine or bromine or be fused with one or more aromatics or
heteroaromatics. Examples of benzo-fused 5-membered heteroaryl
groups are 2-indolyl, 7-indolyl, 2-coumaronyl, 7-coumaronyl,
2-thianaphthenyl, 7-thianaphthenyl, 3-indazolyl, 7-indazolyl,
2-benzimidazolyl and 7-benzimidazolyl. Examples of benzofused
6-membered heteroaryl groups are 2-quinolyl, 8-quinolyl,
3-cinnolyl, 8-cinnolyl, 1-phthalazyl, 2-quinazolyl, 4-quinazolyl,
8-quinazolyl, 5-quinoxalyl, 4-acridyl, 1-phenanthridyl and
1-phenazyl. Nomenclature and numbering of the heterocycles has been
taken from L. Fieser and M. Fieser, Lehrbuch der organischen
Chemie, 3rd revised edition, Verlag Chemie, Weinheim 1957.
[0221] It is preferred that the radicals X.sup.E in the formula
(XIV) are identical, preferably fluorine, chorine, bromine,
C.sub.1-C.sub.7-alkyl or aralkyl, in particular chlorine, methyl or
benzyl.
[0222] The synthesis of such complexes can be carried out by
methods known per se, preferably by reaction of the appropriately
substituted, cyclic hydrocarbon anions with halides of titanium,
zirconium, hafnium or chromium.
[0223] Among the metallocene complexes of the formula (XIV),
preference is given to ##STR18##
[0224] Among the compounds of the formula (XIVa), particular
preference is given to those in which [0225] M.sup.1E is titanium,
vanadium or chromium, [0226] X.sup.E is chlorine,
C.sub.1-C.sub.4-alkyl, phenyl, alkoxy or aryloxy, [0227] t is 1 or
2 and [0228] R.sup.1E to R.sup.5E are each hydrogen or
C.sub.1-C.sub.6-alkyl or two adjacent radicals R.sup.1E to R.sup.5E
form a substituted or unsubstituted benzo group.
[0229] Among the compounds of the formula (XIVb), preference is
given to those in which [0230] M.sup.1E is titanium, zirconium,
vanadium, hafnium or chromium, [0231] X.sup.E is fluorine,
chlorine, C.sub.1-C.sub.4-alkyl or benzyl, or two radicals X.sup.E
form a substituted or unsubstituted butadiene ligand, [0232] t is 0
in the case of chromium, otherwise 1 or 2, preferably 2, [0233]
R.sup.1E to R.sup.5B are each hydrogen, C.sub.1-C.sub.8-alkyl,
C.sub.6-C.sub.8-aryl, NR.sup.8B.sub.2, OSiR.sup.8E.sub.3 or
Si(R.sup.8E).sub.3 and [0234] R.sup.9B to R.sup.13E are each
hydrogen, C.sub.1-C.sub.8-alkyl or C.sub.6-C.sub.8-aryl,
NR.sup.14E.sub.2, OSiR.sup.14E.sub.3 or Si(R.sup.14E).sub.3 [0235]
or two radicals R.sup.1E to R.sup.5E and/or R.sup.9E to R.sup.13E
together with the C.sub.5 ring form an indenyl or substituted
indenyl system.
[0236] The compounds of the formula (XIVb) in which the
cyclopentadienyl radicals are identical are particularly
useful.
[0237] Examples of particularly useful compounds D) of the formula
(XIVb) include: bis(cyclopentadienyl)zirconium dichloride,
bis(pentamethylcyclopentadienyl)zirconium dichloride,
bis(methylcyclopentadienyl)zirconium dichloride,
bis(ethylcyclopentadienyl)zirconium dichloride,
bis(n-butylcyclopentadienyl)zirconium dichloride,
bis-(1-n-butyl-3-methylcyclopentadienyl)zirconium dichloride,
bis(indenyl)zirconium dichloride, bis(tetrahydroindenyl)zirconium
dichloride and bis(trimethylsilylcyclopentadienyl)zirconium
dichloride and also the corresponding dimethylzirconium
compounds.
[0238] Particularly useful compounds of the formula (XIVc) are
those in which
[0239] R.sup.15E is ##STR19## [0240] or .dbd.BR.sup.16E or
.dbd.BNR.sup.6ER.sup.17E, [0241] M.sup.1E is titanium, zirconium or
hafnium, in particular zirconium, and [0242] X.sup.E are identical
or different and are each chlorine, C.sub.1-C.sub.4-alkyl, benzyl,
phenyl or C.sub.7-C.sub.15-alkylaryloxy.
[0243] Particularly useful compounds of the formula (XIVc) are
those of the formula (XIVc') ##STR20## where the radicals R' are
identical or different and are each hydrogen,
C.sub.1-C.sub.10-alkyl or C.sub.3-C.sub.10-cycloalkyl, preferably
methyl, ethyl, isopropyl or cyclohexyl, C.sub.6-C.sub.20-aryl,
preferably phenyl, naphthyl or mesityl, C.sub.7-C.sub.40-arylalkyl,
C.sub.7-C.sub.40-alkylaryl, preferably 4-tert-butylphenyl or
3,5-di-tert-butylphenyl, or C.sub.8-C.sub.40-arylalkenyl,
[0244] R.sup.5E and R.sup.13E are identical or different and are
each hydrogen, C.sub.1-C.sub.6-alkyl, preferably methyl, ethyl,
isopropyl, n-propyl, n-butyl, n-hexyl or tert-butyl, and the rings
S and T may be identical or different and saturated, unsaturated or
partially saturated.
[0245] The indenyl or tetrahydroindenyl ligands of the metallocenes
of the formula (XIVc') are preferably substituted in the 2
position, the 2,4 positions, the 4,7 positions, the 2,4,7
positions, the 2,6, positions, the 2,4,6 positions, the 2,5,6
positions, the 2,4,5,6 positions or the 2,4,5,6,7 positions, in
particular in the 2,4 positions, with the following numbering
applying to the site of substitution: ##STR21##
[0246] Furthermore, preference is given to using bridged
bis-indenyl complexes in the rac or pseudo-rac form as component
D). The term "pseudo-rac form" refers to complexes in which the two
indenyl ligands are in the rac arrangement relative to one another
when all other substituents of the complex are disregarded.
[0247] Further examples of particularly useful catalysts D) (XIVc)
and (XIVc') include:
dimethylsilanediylbis(cyclopentadienyl)zirconium dichloride,
dirnethylsilanediylbis(indenyl)zirconium dichloride,
dimethylsilanediylbis(tetrahydroindenyl)zirconium dichloride,
ethylenebis(cyclopentadienyl)zirconium dichloride,
ethylenebis(indenyl)zirconium dichloride,
ethylenebis(tetrahydroindenyl)zirconium dichloride,
tetramethylethylene-9-fluoroenylcyclopentadienyl)zirconium
dichloride,
dimethylsilanediylbis(3-tert-butyl-5-methylcyclopentadienyl)zirconiumn
dichloride,
dimethylsilanediylbis(3-tert-butyl-5-ethylcyclopentadienyl)zirconium
dichloride, dimethylsilanediylbis(2-methylindenyl)zirconium
dichloride, direthylsilanediylbis(2-isopropylindenyl)zirconium
dichloride, dimethylsilanediylbis(2-tert-butylindenyl)zirconium
dichloride, diethylsilanediylbis(2-methylindenyl)zirconium
dibromide,
dimethylsilanediylbis(3-methyl-5-methylcyclopentadienyl)zirconium
dichloride,
dimethylsilanediylbis(3-ethyl-5-isopropylcyclopentadienyl)zirconium
dichloride, dimethylsilanediylbis(2-ethylindenyl)zirconium
dichloride,
dimethylsilanediylbis(2-methyl-4,5-benzindenyl)zirconium
dichloride, dimethylsilanediylbis(2-ethyl-4,5-benzindenyl)zirconium
dichloride,
methylphenylsilanediylbis(2-methyl-4,5-benzindenyl)zirconium
dichloride,
methylphenylsilanediylbis(2-ethyl-4,5-benzindenyl)zirconium
dichloride,
diphenylsilanediylbis(2-methyl-4,5-benzindenyl)zirconium
dichloride, diphenylsilanediylbis(2-ethyl-4,5-benzindenyl)zirconium
dichloride, diphenylsilanediylbis(2-methylindenyl)hafnium
dichloride,
dimethylsilanediylbis(2-methyl-4-phenylindenyl)zirconium
dichloride,
dirnethylsilanediylbis(2-ethyl-4-phenylindenyl)zirconium
dichloride,
dimethylsilanediylbis(2-methyl-4-(l-naphthyl)indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-ethyl-4-(l-naphthyl)indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-propyl-4-(1-naphthyl)indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-i-butyl-4-(1-naphthyl)indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-propyl-4-(9-phenanthryl)indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-methyl-4-iso-propylindenyl)zirconium
dichloride,
dimethylsilanediylbis(2,7-dimethyl-4-isopropylindenyl)zirconium
dichloride,
dimethylsilanediylbis(2-methyl-4,6-diisopropylindenyl)zirconium
dichloride,
dimethylsilanediylbis(2-methyl-4[p-trifluoromethylphenyl]-indenyl)zirconi-
um dichloride,
diaethylsilanediylbis(2-methyl-4-[3',5'-dimethylphenyl]indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-methyl-4-[4'-tert-butylphenyl]indenyl)zirconium
dichloride,
diethylsilanediylbis(2-methyl-4-[4'-tert-butylphenyl]indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-ethyl-4-[4'-tert-butylphenyl]indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-propyl-4-[4'-tert-butylphenyl]indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-isopropyl-4-[4'-tertbutylphenyl]indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-n-butyl-4-[4'-tertbutylphenyl]indenyl)zirconium
dichloride,
dimethylsilanediylbis(2-hexyl-4-[4'-tert-butylphenyl]indenyl)zirconium
dichloride, dimethylsilanediyl
(2-isopropyl-4-phenylindenyl)(2-methyl-4-phenylindenyl)zirconium
dichloride,
dimethylsilanediyl(2-isopropyl-4-(1-naphthyl)indenyl)(2-methyl-4-(1-napht-
hyl)indenyl)zirconium dichloride,
dimethylsilanediyl(2-isopropyl)-4-[4'-tert-butylphenylindenyl)(2-methyl-4-
-[4'-tert-butylphenyl]indenyl]zirconium dichloride,
dimethylsilanediyl(2-isopropyl-4-[4'-tert-butylphenyl]indenyl)(2-ethyl-4--
[4'-tert-butylphenyl]indenyl)zirconium dichloride,
dimethylsilanediyl(2-isopropyl-4-[4'-tert-butylphenyl]bindenyl)(2-methyl--
4-[3',5'-bis-tert-butylphenyl]indenylzirconium dichloride,
dimethylsilanediyl(2-isopropyl-4-[4'-tert-butylphenyl]indenyl)(2-methyl4--
[1'-naphthyl]indenyl)zirconium dichloride and
ethylene(2-isopropyl-4-[4'-tert-butylphenylidenyl)(2-methyl-4-[4'-tert-bu-
tylphenyl]indenyl)zirconium dichloride, and also the corresponding
dimethylzirconium, zirconium monochloride mono(alkylaryloxide) and
zirconium di(alkylaryloxide) compounds. The complexes are
preferably used in the rac form.
[0248] Such complexes can be synthesized by methods known per se,
preferably by reaction of the appropriately substituted, cyclic
hydrocarbon anions with halides of titanium, zirconium, hafnium,
vanadium, niobium, tantalum or chromium. Examples of appropriate
preparative methods are described, inter alia, in Journal of
Organometallic Chemistry, 369 (1989), 359-370.
[0249] Particularly useful compounds of the formula (XIVd) are
those in which [0250] M.sup.1E is titanium or zirconium, in
particular titanium, and [0251] X.sup.E is chlorine,
C.sub.1-C.sub.4-alkyl or phenyl or two radicals X form a
substituted or unsubstituted butadiene ligand, [0252] R.sup.15E is
##STR22## [0253] or .dbd.BR.sup.16E or .dbd.BNR.sup.16ER.sup.17E,
[0254] A.sup.1E is ##STR23## [0255] t is 1 or 2, preferably 2,
[0256] R.sup.1E to R.sup.3E and R.sup.5E are each hydrogen,
C.sub.1-C.sub.10-alkyl, preferably methyl,
C.sub.3-C.sub.10-Cycloalkyl, C.sub.6-C.sub.15-aryl, NR.sup.8E.sub.2
or Si(R.sup.8).sub.3, or two adjacent radicals form a cyclic group
having from 4 to 12 carbon atoms, with particular preference being
given to all R.sup.1E to R.sup.3E and R.sup.5E being methyl.
[0257] Particularly useful complexes D) of the formula (XIVd) are
dimethylsilanediyl(tetra-methytcyclopentadienyl)(benzylamino)titanium
dichloride,
dimethylsilanediyl(tetra-methylcyclopentadienyl)(tert-butylamino)titanium
dichloride,
dimethylsilanediyl(tetramethylcyclopentadienyl)(adamantyl)titanium
dichloride and dimethylsilanediyl(indenyl)(tert-butylamino)titanium
dichloride.
[0258] Another group of compounds of the formula (XIVd) which are
particularly useful are those in which [0259] M.sup.1E is titanium,
vanadium or chromium, preferably in the oxidation state III, and
[0260] X.sup.E is chlorine, C.sub.1-C.sub.4-alkyl or phenyl or two
radicals X.sup.E form a substituted or unsubstituted butadiene
ligand, [0261] R.sup.15E is ##STR24## or .dbd.BR.sup.16E or
.dbd.BNR.sup.16ER.sup.17E, [0262] A.sup.1E is --O--R.sup.19E,
--NR.sup.19E.sub.2,--PR.sup.19E.sub.2 or an unsubstituted,
substituted or fused, heterocyclic, in particular heteroaromatic,
ring system, [0263] v is 1 or when A.sup.1E is an unsubstituted,
substituted or fused, heterocyclic ring system may be 0 or 1,
[0264] R.sup.1E to R.sup.3E and R.sup.5E are each hydrogen,
C.sub.1-C.sub.10-alkyl, C.sub.3-C.sub.10-cycloalkyl,
C.sub.6-C.sub.15-aryl or Si(R.sup.8E).sub.3, or two adjacent
radicals form a cyclic group having from 4 to 12 carbon atoms.
[0265] In a preferred embodiment, A.sup.1E is an unsubstituted,
substituted or fused, heteroaromatic ring system and M.sup.1E is
chromium. Very particular preference is given to A.sup.1E being an
unsubstituted or substituted, e.g. alkyl-substituted quinolyl or
pyridyl bound in position 8 or 2, e.g. 8-quinolyl,
8-(2-methylquinolyl), 8-(2,3,4-trimethylquinolyl),
8-(2,3,4,5,6,7-hexamethylquinolyl), v being 0 and M.sup.1E being
chromium. Preferred catalysts D) of this type are
1-(8-quinolyl)-2-methyl-4-meihylcyclopentadienylchromium(III)
dichloride,
1-(8-quinolyl)-3-isopropyl-5-methylcyclopentadienylchromium(III)
dichloride,
1-(8-quinolyl)-3-tert-butyl-5-methylcyclopentadienylchromium(III)
dichloride,
1-(8-quinolyl)-2,3,4,5-tetramethylcyclopentadienylchromium(III)
dichloride, 1-(8-quinolyl)tetrahydroindenylchromium(III)
dichloride, 1-(8-quinolyl)indenylchromium(III) dichloride,
1-(8-quinolyl)-2-methylindenylchromium(III) dichloride,
1-(8-quinolyl)-2-isopropylindenylchromium(III) dichloride,
1-(8-quinolyl)-2-ethylindenylchromium(III) dichloride,
1-(8-quinolyl)-2-tert-butylindenylchromium(III) dichloride,
1-(8-quinolyl)benzindenylchromium(III) dichloride,
1-(8-quinolyl)-2-methylbenzindenylchromium(III) dichloride,
1-(8-(2-methylquinolyl))-2-methyl-4-methylcyclopentadienylchromium(III)
dichloride,
1-(8-(2-methylquinolyl)-2,3,4,5-tetramethylcyclopentadienylchromium(III)
dichloride, 1-(8-(2-methylquinolyl))tetrahydroindenylchromium(III)
dichloride, 1-(8-(2-methylquinolyl))indenylchromium(III)
dichloride, 1-(8-(2-methylquinolyl))-2-methylindenylchromium(III)
dichloride,
1-(8-(2-methylquinolyl))-2-isopropylindenylchromium(III)
dichloride, 1-(8-(2-methylquinolyl))-2-ethylindenylchromium(III)
dichloride,
1-(8-(2-methylquinolyl))-2-tert-butylindenylchromium(III)
dichloride, 1-(8-(2-methylquinolyl))benzindenylchromium(III)
dichloride or
1-(8-(2-methylquinolyl))-2-methylbenzindenylchromium(III)
dichloride.
[0266] Furthermore, owing to the ease of preparation, preference is
given to compounds in which R.sup.15E is CH.dbd.CH or 1,2-phenylene
and A.sup.1E is NR.sup.19E.sub.2, and compounds in which R.sup.15E
is CH.sub.2, C(CH.sub.3).sub.2 or Si(CH.sub.3).sub.2 and A.sup.1E
is unsubstituted or substituted 8-quinolyl or unsubstituted or
substituted 2-pyridyl.
[0267] The preparation of such functional cyclopentadienyl ligands
has been known for a long time. Various synthetic routes to these
complexing ligands are described, for example, by M. Enders et al.
in Chem. Ber. (1996), 129, 459-463, or P. Jutzi and U. Siemeling in
J. Orgmet. Chem. (1995), 500, 175-185. The metal complexes, in
particular the chromium complexes, can be obtained in a simple
manner by reacting the appropriate metal salts, e.g. metal
chlorides, with the ligand anion (e.g. using methods analogous to
the examples in DE-A-19710615).
[0268] Further suitable catalysts D) include metallocenes having at
least one ligand which is formed from a cyclopentadienyl or
heterocyclopentadienyl and a fused-on heterocycle, with the
heterocycles preferably being aromatic and containing nitrogen
and/or sulfur. Such compounds are described, for example, in WO
98/22486. These are in particular
dimethylsilanediyl(2-methyl-4-phenylindenyl)(2,5-dimethyl-N-phenyl-4-azap-
entalene)zirconium dichloride,
dimethylsilanediylbis(2-methyl-4-phenyl-4-hydroazulenyl)zirconium
dichloride or
dimethylsilanediylbis(2-ethyl-4-phenyl-4-hydroazulenyl)zirconium
dichloride.
[0269] Further suitable catalysts D) are systems in which a
metallocene compound is combined with, for example, an inorganic
oxide which has been treated with zirconium alkoxide and
subsequently chlorinated, for example by means of carbon
tetrachloride. The preparation of such systems is described, for
example, in WO 01/41920.
[0270] Other suitable catalysts D) include imidochromium compounds
in which chromium bears at least one imido group as structural
feature. These compounds and their preparation are described, for
example, in WO 01/09148.
[0271] Further suitable components D) include transition metal
complexes with a tridentate macrocyclic ligand, in particular
substituted and unsubstituted 1,3,5-triazacyclohexanes and
1,4,7-triazacyclononanes. In the case of this type of catalyst,
preference is likewise given to chromium complexes. Preferred
catalysts of this type are
[1,3,5-tri(methyl)-1,3,5-triazacyclohexane]chromium trichloride,
[1,3,5-tri(ethyl)-1,3,5-triazacyclohexane]chromium trichloride,
[1,3,5-tri(octyl)-1,3,5-triazacyclohexane]chromium trichloride,
[1,3,5-tri(dodecyl)-1,3,5-trazacyclohexane]chromium trichloride and
[1,3,5-tri(benzyl)-1,3,5-triazacyclohexane]chromium
trichloride.
[0272] Further suitable catalysts D) are, for example, transition
metal complexes with at least one ligand of the formulae XV to XIX,
##STR25## where the transition metal is selected from among the
elements Ti, Zr, Hf, Sc, V, Nb, Ta, Cr, Mo, W, Fe, Co, Ni, Pd, Pt
and the elements of the rare earth metals. Preference is given to
compounds having nickel, iron, cobalt or palladium as central
metal.
[0273] E.sup.F is an element of group 15 of the Periodic Table of
the Elements, preferably N or P, with particular preference being
given to N. The two or three atoms E.sup.F in a molecule can be
identical or different.
[0274] The radicals R.sup.1F to R.sup.25F, which may be identical
or different within a ligand system XV to XIX, are as follows:
[0275] R.sup.1F and R.sup.4F are each, independently of one
another, hydrocarbon radicals or substituted hydrocarbon radicals,
preferably hydrocarbon radicals in which the carbon atom adjacent
to the element E.sup.F is bound to at least two carbon atoms,
[0276] R.sup.2F and R.sup.3F are each, independently of one
another, hydrogen, a hydrocarbon radical or a substituted
hydrocarbon radical, where R.sup.2F and R.sup.3F together may also
form a ring system in which one or more heteroatoms may be present,
[0277] R.sup.6F and R.sup.8F are each, independently of one
another, hydrocarbon radicals or substituted hydrocarbon radicals,
[0278] R.sup.5F and R.sup.9F are each, independently of one
another, hydrogen, a hydrocarbon radical or a substituted
hydrocarbon radical, [0279] where R.sup.6F and R.sup.5F or R.sup.8F
and R.sup.9F may together also form a ring system, [0280] R.sup.7F
are each, independently of one another, hydrogen, a hydrocarbon
radical or a substituted hydrocarbon radical, where two R.sup.7F
may together also form a ring system, [0281] R.sup.10F and
R.sup.14F are, independently of one another, hydrocarbon radicals
or substituted hydrocarbon radicals, [0282] R.sup.11F, R.sup.12F,
R.sup.12F' and R.sup.13F are each, independently of one another,
hydrogen, a hydrocarbon radical or a substituted hydrocarbon
radical, where two or more geminal or vicinal radicals R.sup.11F,
R.sup.12F, R.sup.12F' and R.sup.13F may together form a ring
system, [0283] R.sup.15F and R.sup.18F are each, independently of
one another, hydrogen, a hydrocarbon radical or a substituted
hydrocarbon radical, [0284] R.sup.16F and R.sup.17F are each,
independently of one another, hydrogen, a hydrocarbon radical or a
substituted hydrocarbon radical, [0285] R.sup.19F and R.sup.25F are
each, independently of one another, C.sub.2-C.sub.20-alkenyl,
C.sub.6-C.sub.20-aryl, alkylaryl having from 1 to 10 carbon atoms
in the alkyl part and 6-20 carbon atoms in the aryl part, where the
organic radicals R.sup.16F and R.sup.25F may also be substituted by
halogens, [0286] R.sup.20F-R.sup.24F are each, independently of one
another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl, alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part or SiR.sup.26F.sub.3, where the organic radicals
R.sup.20F-R.sup.24F may also be substituted by halogens and two
vicinal radicals Re.sup.20FR.sup.24F may also be joined to form a
five- or six-membered ring and [0287] R.sup.26F are each,
independently of one another, hydrogen, C.sub.1-C.sub.20-alkyl,
C.sub.2-C.sub.20-alkenyl, C.sub.6-C.sub.20-aryl or alkylaryl having
from 1 to 10 carbon atoms in the alkyl part and 6-20 carbon atoms
in the aryl part and two radicals R.sub.26F may also be joined to
form a five- or six-membered ring, [0288] x is 0 or 1, with the
complex of the formula (XVI) being negatively charged when x=0, and
[0289] y is an integer from 1 to 4, preferably 2 or 3.
[0290] Particularly useful transition metal complexes are those
having Fe, Co, Ni, Pd or Pt as central metal and containing ligands
of the formula (XV). Particular preference is given to diimine
complexes of Ni or Pd, e.g.:
[0291]
Di(2,6-di-i-propylphenyl)-2,3-dimethyldiazabutadienepalladium
dichloride, di(di-i-propylphenyl)-2,3-dimethyldiazabutadienenickel
dichloride,
di(2,6-di-i-propylphenyl)dimethyldiazabutadienedimethylpalladium,
di(2,6-di-i-propylphenyl)-2,3-dimethyldiazabutadienedimethylnickel,
di(2,6-dimethylphenyl)-2,3-dimethyldiazabutadienepalladium
dichloride, di(2,6-dimethylphenyl)-2,3-dimethyldiazabutadienenickel
dichloride,
di(2,6-dimethylphenyl)-2,3-dimethyldiazabutadienedimethylpalladium,
di(2,6-dimethylphenyl)-2,3-dimethyldiazabutadienedimethylnickel,
di(2-methylphenyl)-2,3-dimethyldiazabutadienepalladium dichloride,
di(2-methylphenyl)-2,3-methyldiazabutadienenickel dichloride,
di(2-methylphenyl)-2,3-dimethyldiazabutadienedimethylpalladium,
di(2-methylphenyl)-2,3-dimethyldiazabutadienedimethylnickel,
diphenyl-2,3-dimethyldiazabutadienepalladium dichloride,
diphenyl-2,3-dimethyldiazabutadienenickel dichloride,
diphenyl-2,3-dimethyldiazabutadienedimethylpalladium,
diphenyl-2,3-dimethyldiazabutadienedimethylnickel,
di(2,6-dimethylphenyl)azanaphthenepalladium dichloride,
di(2,6-dimethylphenyl)azanaphthenenickel dichloride,
di(2,6-dimethylphenyl)azanaphthenedimethylpalladium,
di(2,6-dimethylphenyl)azanaphthenedimethylnickel,
1,1'-bipyridylpalladium dichloride, 1,1'-bipyridylnickel
dichloride, 1,1'-bipyridyl(dimethyl)palladium,
1,1'-bipyridyl(dimethyl)nickel.
[0292] Particularly useful compounds (XIX) also include those which
are described in J. Am. Chem. Soc. 120, p. 4049 ff. (1998), J.
Chem. Soc., Commun. 1998, 849, and WO 98/27124. E.sup.F is
preferably nitrogen and R.sup.19F and R.sup.25F in (XIX) are
preferably phenyl, naphthyl, biphenyl, anthranyl, o-, m-,
p-methylphenyl, 2,3-, 2,4-, 2,5- or 2,6-dimethylphenyl,
-dichlorophenyl or -dibromophenyl, 2-chloro-6-methylphenyl, 2,3,4-,
2,3,5-, 2,3,6-, 2,4,5-, 2,4,6- or 3,4,5-trimethylphenyl, in
particular 2,3- or 2,6-dimethylphenyl, -diisopropylphenyl,
-dichlorophenyl or -dibromophenyl and 2,4,6-trimethylphenyl. At the
same time, RF and R.sup.24F are preferably hydrogen, methyl, ethyl,
n-propyl, isopropyl, n-butyl, tert-butyl, n-pentyl, n-hexyl,
n-heptyl, n-octyl, benzyl or phenyl, in particular hydrogen or
methyl. R.sup.21F and R.sup.23F are preferably hydrogen and
R.sup.22F is preferably hydrogen, methyl, ethyl or phenyl, in
particular hydrogen. Preference is given to complexes of the
ligands XIX with the transition metals Fe, Co or Ni, in particular
Fe. Particular preference is given to
2,6-diacetylpyridinebis(2,4-dimethylphenylimine)iron dichloride,
2,6-diacetylpyridinebis(2,4,6-trimethylphenylimine)iron dichloride,
2,6-diacetylpyridinebis(2-chloro-6-methylphenylimine)iron
dichloride, 2,6-diacetylpyridinebis(2,6-diisopropylphenylimine)iron
dichloride, 2,6-diacetylpyridinebis(2,6-dichlorophenylimine)iron
dichloride,
2,6-pyridinedicarboxaldehydebis(2,6-diisopropylphenylimine)iron
dichloride, 2,6-diacetylpyridinebis(2,4-dimethylphenylimine)cobalt
dichloride,
2,6-diacetylpyridinebis(2,4,6-trimethylphenylimine)cobalt
dichloride,
2,6-diacetylpyridinebis(2-chloro-6-methylphenylimine)cobalt
dichloride,
2,6-diacetylpyridinebis(2,6-diisopropylphenylimine)cobalt
dichloride, 2,6-diacetylpyridinebis(2,6-dichlorophenylimine)cobalt
dichloride, and
2,6-pyridinedicarboxaldehydebis(2,6-diisopropylphenylimine)cobalt
dichloride.
[0293] Iminophenoxide complexes can also be used as catalysts D).
The ligands of these complexes can be prepared, for example, from
substituted or unsubstituted salicylaldehydes and primary amines,
in particular substituted or unsubstituted arylamines. Transition
metal complexes with pi ligands having one or more heteroatoms in
the pi system, for example the boratabenzene ligand, the pyrrolyl
anion or the phospholyl anion, can also be used as catalyst D).
[0294] Further complexes suitable as catalyst D) include those
which have bidentate or tridentate chelating ligands. In such
ligands, for example, and ether function is linked to an amine or
amide function or an amide is linked to a heteroaromatic such as
pyridine.
[0295] Such combinations of components A) and D) enable, for
example, bimodal products to be prepared or comonomers to be
generated in situ. Preference is given to using at least one
monocyclopentadienyl complex A) in the presence of at least one
catalyst D) customary for the polymerization of olefins and if
desired, one or more activating compounds C). Here, depending the
catalyst combinations A) and D), one more activating compounds C)
may be advantageous. The polymerization catalysts D) can likewise
be supported and can be used simultaneously or in any order with
the complex A) of the present invention. For example, the
monocyclopentadienyl complex A) and the polymerization catalysts D)
can be applied together to a support B) or different supports B).
It is also possible to use mixtures of various catalysts as
component D). The molar ratio of monocyclopentadienyl complex A) to
polymerization catalyst B) is usually in the range from 1:100 to
100:1, preferably from 1:20 to 20:1 and particularly preferably
from 1:10 to 10:1.
[0296] The catalyst system may further comprise, as additional
component E), a metal compound of the formula (XX),
M.sup.G(R.sup.1G).sub.r.sub.c(R.sup.2G).sub.s.sub.G(R.sup.3G).sub.t.sub.G
(XX) where [0297] M.sup.G is Li, Na, K, Be, Mg, Ca, Sr, Ba, boron,
aluminum, gallium, indium, thallium, zinc, in particular Li, Na, K,
Mg, boron, aluminum or Zn, [0298] R.sup.1G is hydrogen,
C.sub.1-C.sub.10-alkyl, C.sub.6-C.sub.15-aryl, alkylaryl or
arylalkyl each having from 1 to 10 carbon atoms in the alkyl part
and from 6 to 20 carbon atoms in the aryl part, [0299] R.sup.2G and
R.sup.3G are each hydrogen, halogen, C.sub.1-C.sub.10-alkyl,
C.sub.6-C.sub.15-aryl, alkylaryl, arylalkyl or alkoxy each having
from 1 to 20 carbon atoms in the alkyl radical and from 6 to 20
carbon atoms in the aryl radical, or alkoxy with
C.sub.1-C.sub.10-alkyl or C.sub.6-C.sub.15-aryl, [0300] r.sup.G is
an integer from 1 to 3 [0301] and [0302] s.sup.G and t.sup.G are
integers from 0 to 2, with the sum r.sup.G+s.sup.G+t.sup.G
corresponding to the valence of M.sup.G, where the component E) is
not identical to the component C). It is also possible to use
mixtures of various metal compounds of the formula (XX).
[0303] Among the metal compounds of the formula (XX), preference is
given to those in which [0304] M.sup.G is lithium, magnesium, boron
or aluminum and [0305] R.sup.10 is C.sub.1-C.sub.20-alkyl.
[0306] Particularly preferred metal compounds of the formula (XX
are methyllithium, ethyllithium, n-butyllithium, methylmagnesium
chloride, methylmagnesium bromide, ethylmagnesium chloride,
ethylmagnesium bromide, butylmagnesium chloride, dimethylmagnesium,
diethyimagnesium, dibutylmagnesium, n-butyl-n-octylmagnesium,
n-butyl-n-heptylmagnesium, in particular n-butyl-n-octylmagnesium,
tri-n-hexylaluminum, triisobutylaluminum, tri-n-butylaluminum,
triethylaluminum, dimethylaluminum chloride, dimethylaluninum
fluoride, methylaluminum dichloride, methylaluminum sesquichloride,
diethylaluminum chloride and trimethylaluminum and mixtures
thereof. The partial hydrolysis products of aluminum alkyls with
alcohols can also be used.
[0307] When a metal compound E) is used, it is preferably present
in the catalyst system in such an amount that the molar ratio of
M.sup.G from formula (XX) to transition metal from
monocyclopentadienyl compound A) is from 2 000:1 to 0.1:1,
preferably from 800:1 to 0.2:1 and particularly preferably from
100:1 to 1:1.
[0308] In general, the catalyst solid together with the further
metal compound E) of the formula (XX), which may be different from
the metal compound or compounds E) used in the preparation of the
catalyst solid, is used as constituent of a catalyst system for the
polymerization of copolymerization of olefins. It is also possible,
particularly when the catalyst solid does not contain any
activating component C), for the catalyst system to further
comprise, in addition to the catalyst solid, one or more activating
compounds C) which are identical to or different from any
activating compounds C) present in the catalyst solid.
[0309] To prepare the catalyst systems of the present invention,
preference is given to immobilizing at least one of the components
A) and/or C) on the support B) by physisorption or by means of
chemical reaction, i.e. covalent binding of the components, with
reactive groups of the support surface. The order in which the
support component B), the component A) and any component C) are
combined is immaterial. The components A) and C) can be added
independently of one another or simultaneously or in premixed form
to B). After the individual process steps, the solid can be washed
with suitable inert solvents such as aliphatic or aromatic
hydrocarbons.
[0310] In a preferred embodiment the monocyclopentadienyl complex
A) is brought into contact with the activating compound C) in a
suitable solvent, usually giving a soluble reaction product, an
adduct or a mixture. The preparation obtained in this way is then
brought into contact with the support B), which may have been
pretreated, and the solvent is completely or partly removed. This
preferably gives a solid in the form of a free-flowing powder.
Examples of the industrial implementation of the above process are
described in WO 96/00243, WO 98/40419 or WO 00/05277. A further
preferred embodiment comprises firstly applying the cation-forming
compound C) to the support B) and subsequently bringing this
supported cation-forming compound into contact with the
monocyclopentadienyl complex A).
[0311] The component D) can likewise be reacted in any order with
the components A) and, if desired, B), C) and E). Preference is
given to bringing D) firstly into contact with component C) and
then dealing with the components A) and B) and any further C) as
described above. In another preferred embodiment, a catalyst solid
is prepared from the components A), B) and C) as described above
and this is brought into contact with the component E) during, at
the beginning of or shortly before the polymerization. Preference
is given to E) firstly being brought into contact with the
(X-olefin to be polymerized and the catalyst solid comprising the
components A), B) and C) as described above subsequently being
added.
[0312] The monocyclopentadienyl complex A) can be brought into
contact with the component(s) C) and/or D) either before or after
being brought into contact with the olefin to be polymerized.
Preactivation using one or more components C) prior to mixing with
the olefin and further addition of the same or different components
C) and/or D) after the mixture has been brought into contact with
the olefin is also possible. Preactivation is generally carried out
at 10-100.degree. C., in particular 20-80.degree. C.
[0313] It is also possible for the catalyst system firstly to be
prepolymerized with .alpha.-olefins, preferably linear
C.sub.2-C.sub.10-1-alkenes and in particular ethylene or propylene,
and the resulting prepolymerized catalyst solid then to be used in
the actual polymerization. The mass ratio of catalyst solid used in
the prepolymerization to monomer polymerized onto it is usually in
the range from 1:1 to 1:1 000, preferably from 1:1 to 1:200.
[0314] Furthermore, a small amount of an olefin, preferably an
.alpha.-olefin, for example vinylcyclohexane, styrene or
phenyldimethylvinylsilane, as modifying component, an antistatic or
a suitable inert compound such as a wax or oil can be added as
additive during or after the preparation of the catalyst system.
The molar ratio of additives to transition metal compound B) is
usually from 1:1 000 to 1 000:1, preferably from 1:5 to 20:1.
[0315] The catalyst systems of the present invention are suitable
for the polymerization of olefins and especially for the
polymerization of .alpha.-olefins, i.e. hydrocarbons having
terminal double bonds. Suitable monomers also include
functionalized olefinically unsaturated compounds such as acrolein,
ester or amide derivatives of acrylic or methacrylic acid, for
example acrylates, methacrylates or acrylonitrile, or vinyl esters,
for example vinyl acetate. Preference is given to nonpolar olefinic
compounds, including aryl-substituted .alpha.-olefins. Particularly
preferred .alpha.-olefins are linear or branched
C.sub.2-C.sub.12-1-alkenes, in particular linear
C.sub.2-C.sub.10-1-alkenes such as ethene, propene, 1-butene,
1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene or branched
C.sub.2-C.sub.10-1-alkenes such as 4-methyl-1-pentene, conjugated
and unconjugated dienes such as 1,3-butadiene, 1,5-hexadiene or
1,7-octadiene or vinylaromatic compounds such as styrene or
substituted styrene. It is also possible to polymerize mixtures of
various .alpha.-olefins. Preference is given to polymerizing at
least one olefin selected from the group consisting of ethene,
propene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene and
1-decene.
[0316] Suitable olefins also include ones in which the double bond
is part of a cyclic structure which can have one or more ring
systems. Examples are cyclopentene, cyclohexene, norbornene,
tetracyclododecene and methylnorbornene and dienes such as
5-ethylidine-2-norbornene, norbornadiene or ethylnorbornadiene.
[0317] Mixtures of two or more olefins can also be polymerized. In
contrast to some known iron and cobalt complexes, the
monocyclopentadienyl complexes of the present invention display a
good polymerization activity even in the case of higher
.alpha.-olefins, so that their suitability for copolymerization
deserves particular emphasis. In particular, the
monocyclopentadienyl complexes of the present invention can be used
for the polymerization or copolymerization of ethene or propene. As
comonomers in the polymerization of ethene, preference is given to
using C.sub.3-C.sub.8-.alpha.-olefins or norbornene, in particular
1-butene, 1-pentene, 1-hexene and/or 1-octene. Preference is given
to using monomer mixtures containing at least 50 mol % of ethene.
Preferred comonomers in the polymerization of propylene are ethene
and/or butene.
[0318] The polymerization can be carried out in a known manner in
bulk, in suspension, in the gas phase or in a supercritical medium
in the customary reactors used for the polymerization of olefins.
It can be carried out batchwise or preferably continuously in one
or more stages. High-pressure polymerization processes in tube
reactors or autoclaves, solution processes, suspension processes,
stirred gas-phase processes or gas-phase fluidized-bed processes
are all possible.
[0319] The polymerizations are usually carried out at from -60 to
350.degree. C. under pressures of from 0.5 to 4 000 bar at mean
residence times of from 0.5 to 5 hours, preferably from 0.5 to 3
hours. The advantageous pressure and temperature ranges for
carrying out the polymerizations usually depend on the
polymerization method. In the case of high-pressure polymerization
processes, which are usually carried out at pressures of from 1 000
to 4 000 bar, in particular from 2 000 to 3 500 bar, high
polymerization temperatures are generally also set. Advantageous
temperature ranges for these high-pressure polymerization processes
are from 200 to 320.degree. C., in particular from 220 to
290.degree. C. In the case of low-pressure polymerization
processes, a temperature which is at least a few degrees below the
softening temperature of the polymer is generally set. These
polymerization processes are preferably carried out at from 50 to
180.degree. C., preferably from 70 to 120.degree. C. In the case of
suspension polymerization, the polymerization is usually carried
out in a suspension medium, preferably an inert hydrocarbon such as
isobutane or a mixture of hydrocarbons, or else in the monomers
themselves. The polymerization temperatures are generally in the
range from -20 to 115.degree. C., and the pressure is generally in
the range from 1 to 100 bar. The solids content of the suspension
is generally in the range from 10 to 8%. The polymerization can be
carried out batchwise, e.g. in stirring autoclaves, or
continuously, e.g. in tube reactors, preferably in loop reactors.
Particular preference is given to employing the Phillips PF process
as described in U.S. Pat. No. 3,242,150 and U.S. Pat. No.
3,248,179. The gas-phase polymerization is generally carried out at
from 30 to 125.degree. C.
[0320] Among the abovementioned polymerization processes,
particular preference is given to gas-phase polymerization, in
particular in gas-phase fluidized-bed reactors, solution
polymerization and suspension polymerization, in particular in loop
reactors and stirred tank reactors. The gas-phase polymerization
can also be carried out in the condensed or supercondensed phase,
in which part of the circulating gas is cooled to below the dew
point and is recirculated as a two-phase mixture to the reactor. It
is also possible to use a multizone reactor in which two
polymerization zones are linked to one another and the polymer is
passed alternately through these two zones a number of times. The
two zones can also have different polymerization conditions. Such a
reactor is described, for example, in WO 97/04015. The different or
identical polymerization processes can also, if desired, be
connected in series so as to form a polymerization cascade, for
example in the Hostalen process. A parallel reactor arrangement
using two or more identical or different processes is also
possible. Furthermore, molar mass regulators, for example hydrogen,
or customary additives such as antistatics can also be used in the
polymerizations.
[0321] The monocyclopentadienyl complexes of the present invention
and the catalyst systems in which they are present can also be
prepared by means of combinatorial synthesis or their
polymerization activity can be tested with the aid of combinatorial
methods.
[0322] The process of the present invention allows polymers of
olefins to be prepared. The term "polymerization" as used here in
the description of the present invention encompasses both
polymerization and oligomerization, i.e. oligomers and polymers
having molar masses M, in the range from about 56 to 3 000 000
g/mol can be produced by this process.
[0323] Owing to their good mechanical properties, the olefin
polymers prepared using the catalyst system of the present
invention are particularly useful for the production of films,
fibers and moldings.
[0324] The catalyst systems of the present invention give a very
productivity in the polymerization of olefins, offer advantages in
the work-up of the polymers after the polymerization and lead to
significantly fewer problems in respect of catalyst residues in the
polymer. The polymers prepared using the catalyst system of the
present invention are particularly useful for applications which
require a high productivity. In addition, the catalyst systems of
the present invention display a very good activity even at a
relatively low molar ratio of aluminoxane to tranition metal
compound and incorporate high levels of comonomer. The catalyst
systems are therefor especially well suited for the preparation of
ethylene copolymers with a density from 0.89 to 0.93 g/cm.sup.3 and
with a molecular weight of 20 000 to 140 000 g/mol.
EXAMPLES
[0325] The comonomer content of the polymer (% by weight of hexene
in the polymer), its methyl side chain content per 1 000 carbon
atoms of the polymer chain (CH.sub.3/1 000 C) were determined by IR
spectroscopy.
[0326] The .eta. value was determined by means of an automatic
Ubbelohde viscometer (Lauda PVS 1) using decalin as solvent at
130.degree. C. (ISO 1628 at 130.degree. C., 0.001 g/ml of
decalin).
[0327] The determination of the molar mass distributions and the
mean values M.sub.n, M.sub.w and M.sub.w/M.sub.n derived therefrom
were carried out by means of high-temperature gel permeation
chromatography using a method based on DIN 55672 under the
following conditions: solvent: 1,2,4-trichlorobenzen, flow: 1
ml/min, temperature: 140.degree. C., calibration using PE
standards.
[0328] The density [g/cm.sup.3] was determined in accordance with
ISO 1183.
[0329] Abbreviations in the table below: [0330] cat. catalyst
[0331] t(poly) polymerization time [0332] polymer amount of polymer
formed [0333] Mw weight average molar mass [0334] Mn number average
molar mass [0335] density polymer density [0336] prod. productivity
of the catalyst in g of polymer obtained per mmol of catalyst
(chromium complex) used per hour
[0337] All catalyst preparations and handling were carried out
under inert gas conditions. All solvents were dried and
degassed.
Example 1
1.1. Preparation of 2-[2-(1H-inden-3-yl)ethyl]pyridine (as
described by H. Dressler and R. J. Kurland, J. Org. Chem. 29 1 p.
175-178)
[0338] 43 g (0.47 mol) of 2-vinylpyridine were added to a mixture
of 56 ml (0.48 mol) of indene in 40 ml of toluene and 4 g (0.036
mol) of solid potassium tert-butoxide at 60-90.degree. C. over a
period of 40 minutes. The mixture was then stirred for another 2
hours at 115.degree. C., cooled to room temperature and
subsequently neutralized by means of 2 ml of glacial acetic acid.
Insoluble constituents were filtered off and the filtrate was
distilled under reduced pressure. This gave 42 g of
2-[2-(1H-inden-3-yl)ethyl]pyridine (40%, b.p. 161-163.degree. C. at
2 mm).
[0339] .sup.1HNMR (CDCl.sub.3): 8.62 (d, 1H); 7.64 (td, 1H); 7.55
(d, 1H); 7.51 (d, 1H); 7.39 (t, 1H), 7.29 (t, 1H); 7.23 (d, 1H);
7.19 (dd, 1H); 6.32 (m, 1H1); 3.40 (m, 2H); 3.28 (m, 2H); 3.12 (m,
2H).
1.2. Preparation of (3-(2-pyridylethyl)indenyl)chromium
dichloride
[0340] ##STR26##
[0341] A solution of 22.1 g (0.1 mol) of
2-[2-(1H-inden-3-yl)ethyl]pyridine in 470 ml of tetrahydrofuran was
cooled to -100.degree. C. 62.5 ml of a 15% strength n-butyllithium
solution in hexane (0.1 mol) were slowly added dropwise. After the
addition was complete, the reaction mixture was stirred for a
further 50 minutes at -100.degree. C. The mixture was subsequently
allowed to warm to room temperature. After stirring for another 2
hours, the solution was cooled to -60.degree. C. and 38 g (0.1 mol)
of chromium trichloride tris(tetrahydrofuran) were added while
stirring. The mixture was allowed to warm slowly to room
temperature and was subsequently stirred for another 10 hours at
room temperature. The reaction mixture was then refluxed for 20
minutes and subsequently cooled to room temperature. The solid
which had precipitated was filtered off and washed with hot
tetrahydrofan. The solid was subsequently washed with diethyl ether
and dried under reduced pressure. This gave 28.1 g of
(3-(2-pyridylethyl)indenyl)chromium dichloride (82%).
Example 2
[0342] a) Pretreatment of support: 100 g of Puralox MG 61 (calcined
hydrotalcite) from Condea Chemie, GmbH (now Sasol Chemie) were
heated at 180.degree. C. for 6 hours.
[0343] b) Application of the catalyst complex to the support: 148.9
mg of the complex from example 1 (82.1 mmol) were admixed with
11.42 ml of a 4.75 M solution of MAO in toluene from Albemarle and
the mixture was stirred for 15 minutes. The resulting solution was
added over a period of 10 minutes to 6.2 g of the pretreated
calcined hydrotalcite and the mixture was stirred for another 60
min. The catalyst was then dried at room temperature at 10.sup.-3
mbar. This gave a light-green powder.
Example 3
Polymerization
[0344] The polymerization experiments were carried out in a 1 l
four-necked flask provided with contact thermometer, stirrer with
Teflon blade, heating mantle and gas inlet tube. 15.5 .mu.mol of
(3-(2-pyridylethyl)indenyl)chromium dichloride together with 250 ml
of toluene were placed in the flask at 40.degree. C. under argon.
To activate the catalyst, 7.77 mmol of 1.6M MAO solution in toluene
were added.
[0345] Before introduction of ethylene, 3 ml of hexene were placed
in the flask and about 40 l/h of ethylene were subsequently passed
through the initial charge for 20 minutes at atmospheric pressure.
The remaining amount of hexene (another 8 ml) was introduced via a
dropping funnel over a period of 10 minutes.
[0346] The reaction was stopped by addition of a mixture of 15 ml
of concentrated hydrochloric acid and 50 ml of methanol and the
mixture was stirred for another 15 minutes. After addition of
another 250 ml of methanol and stirring for 15 minutes, the mixture
was filtered, the solid was washed three times with methanol and
dried at 70.degree. C. This gave 8.9 g of ethylene-hexene copolymer
(activity of the catalyst: 1 735 gl(mmol of Cr-h)) having an
M.sub.w of 397 972 g/mol, an M.sub.w/M.sub.n of 3.34, a hexene
content of 6.2% and a density of 0.9053 g/cm.sup.3.
Example 4
Polymerization
[0347] 400 ml of isobutane and 2 ml of a triisobutylaluminum
solution in heptane (corresponding to 60 mg of triisobutylaluminum)
were placed in a 1 l autoclave which had been made inert by means
of argon, and 149 mg of the catalyst solid obtained in example 2b)
were finally added. Polymerization was carried out at 70.degree. C.
and an ethylene pressure of 40 bar for 60 minutes. The
polymerization was stopped by releasing the pressure and the
product was discharged through the bottom valve. This gave 157 g of
polyethylene having a density of 0.9228 g/cm.sup.3, a bulk density
of 412 kg/m.sup.3 and a .eta. value of 32.28 dl/g.
[0348] Productivity: 1050 g of PE/g of catalyst solid.
Example 5
5.1. Preparation of
2-{2-[1-(trimethylsilyl)-1H-inden-3-yl]ethyl}pyridine
[0349] 2-[2-(1H-inden-3-yl)ethyl]pyridine (14.88g, 0.0637 mol) was
dissolved in 190 ml of diethylether. The resulting solution was
cooled to -90.degree. C. and then 15% n-butyllithium in hexane
(42.08 ml, 67.3 mmol) added. The resulting mixture was stirred at
this temperature for an additional 30 min and then allowed to reach
room temperature. After additional stirring for 1 h at room
temperature, the mixture was cooled to -90.degree. C. and was then
treated with a solution of SiMe.sub.3Cl (9.4 ml, 74 mmol) in 10 ml
of diethylether. The resulting mixture was allowed to warm to room
temperature and then stirred for 12 h. Then the mixture was first
treated with water and then aqueous ammonium chloride solution. The
organic phase was separated and the aqueous phase extracted three
times with diethylether. The combined organic phase was washed with
brine and dried over MgSO.sub.4. After filtration, the solvent was
removed from the filtrate to give 15.97 g (81%) of
2-{2-[1-(trimethylsilyl)-1H-inden-3-yl]ethyl}pyridine as an oil,
which was used in the next stage without separation.
[0350] .sup.1H-NMR (CDCl.sub.3): 8.63 (d, 1H); 7.62 (dt, 1H); 7.53
(d, 1H); 7.48 (s, 1H); 7.33 (t, 1H); 7.24 (m, 2H); 7.16 (dd, 1H);
6.39 (br s, 1H); 3.44 (br s, 1H); 3.26 (m, 2H); 3.14 (m, 2H); -0.04
(s, 9H).
5.2. Preparation of
2-{2-[1-(trimethylsilyl)-indenyl]ethyl}pyridinechromium
dichloride
[0351] ##STR27##
[0352] A solution of
2-{2-[1-(trimethylsilyl)-1H-inden-3-yl]ethyl}pyridine (15.97 g,
54.5 mmol) in 170 ml of tetrahydrofuran was cooled to -100.degree.
C.15% n-butyllithium in hexane (34 ml, 54.5 mmol) was added and the
resulting mixture stirred at this temperature for an additional 1
h. The reaction mixture was allowed to warm up to room temperature
(in about 2 h) and then cooled to -60.degree. C. 20.42 g (54.5
mmol) of chromium trichloride tris(tetrahydrofuran) were added, the
resulting mixture allowed to warm to room temperature and then
stirred for 12 h. Then 90 ml of solvent were removed, the resulting
green suspension refluxed for 20 min and then slowly cooled to room
temperature. The green precipitate was filtered off and washed
twice with diethylether to give 15.6 g of green powder.
Recrystallization from a mixture of dichloromethane/diethylether
gave 5 g (22%) of
2-{2-[1-(trimethylsilyl)-indenyl]-ethyl}pyridinechromium dichloride
as dark green powder.
Example 6
6.1. Preparation of
2-[2-(1H-inden-1-yl)-2-methylpropyl]pyridine
[0353] A solution of .alpha.-Picoline (1.97 ml, 20 mmol) in 10 ml
of tetrahydrofuran was cooled to -20.degree. C. and 15%
n-butyl-lithium in hexane (13 ml, 20 mmol) was added during 10 min
with stirring. The cooling bath was removed and the solution
allowed to stir for 1 h while the temperature rose to room
temperature. The resulting mixture was treated with a solution of
1-(1-methylethylidene)-1H-indene (3.12 g, 20 mmol) in 5 ml of
tetrahydrofuran (5 ml) with vigorous stirring. The resulting
solution was stirred for 14 h and hydrolyzed with 60 ml of 15-%
hydrochloric acid. The organic layer was isolated and the aqueous
phase washed once with ethyl acetate, then neutralized with aqueous
ammonia solution and extracted three times with dichloromethane.
The combined organic layers were dried over MgSO.sub.4, filtered
and the solvent removed to give 4.28 g (86%) of
2-[2-(1H-inden-1-yl)-2-methylpropyl]pyridine as an oil. The product
was NMR-pure, so no further distillation was necessary.
[0354] .sup.1H-NMR (CDCl.sub.3): 8.55 (dm, 1H); 7.84 (d, 1H); 7.53
(d, 1H); 7.39 (m, 2H); 7.26 (t, 1H); 7.08 (ddd, 1H); 6.70.(d, 1H);
6.11 (t, 1H); 3.32 (br.s, 2H); 3.30 (d, 2H); 1.42 (s, 6H).
6.2. Preparation of 2-[2-(indenyl)-2-methylpropyl]pyridinechromium
dichloride
[0355] ##STR28##
[0356] A solution of 2-[2-(1H-inden-1-yl)-2-methylpropyl]pyridine
(4.28 g, 17.2 mmol) in 53 ml of tetrahydrofuran was cooled to
-100.degree. C.15% n-butyllithium in hexane (10.7 ml, 17.2 mmol)
was added and the resulting mixture stirred at this temperature for
an additional 1 h. The reaction mixture was allowed to warm up to
room temperature (in about 2 h) and then cooled to 60.degree. C.
6.44 g (17.2 mmol) of chromium trichloride tris(tetrahydrofuran)
were added, the resulting mixture allowed to warm to room
temperature and then stirred for 12 h. Then 30 ml of solvent were
removed, the green precipitate filtered off and washed twice with
diethylether to give 3.6 g of green powder. Recrystallization from
a mixture of dichloromethane/diethylether gave 2.1 g of
2-[2-(indenyl)-2-methylpropyl]pyridinechromium dichloride as dark
green powder.
Example 7
7.1. Preparation of
2-[2-(1H-inden-3-yl)-2-methylpropyl]4-methyl-1,3-thiazole
[0357] A solution of 2,4-dimethyl-1,3-thiazole (3.2 g, 28.1 mmol)
in 20 ml of tetrahydrofuran was cooled to -78.degree. C. and 15%
n-butyl-lithium in hexane (17.5 ml, 28 mmol) was added during 15
min with stirring. The resulting yellow suspension was stirred for
20 min and then a solution of 1-(1-methylethylidene)-1H-indene (4.6
g, 29 mmol) in 5 ml of tetrahydrofuran added with vigorous stirring
while the temperature was maintained at -78.degree. C. The reaction
mixture was allowed to reach room temperature and for 14 h. The
resulting mixture was hydrolyzed with a saturated ammonium chloride
solution.
[0358] The organic layer was isolated and the aqueous phase
extracted three times with dichloromethane. The combined organic
layers were dried over MgSO.sub.4, filtered and the solvent
removed. The crude product was further purified by column
chromatography over silica. At the beginning a 5/1 hexane/ethyl
actetate elution mixture was used, (for the separation from
1-(1-methylethylidene)-1H-indene). Then, the elution mixture was
changed to 1/1 hexane/ethyl actetate. After removal of the solvent
5.62 g (74%) of
2-[2-(1H-inden-3-yl)-2-methylpropyl]-4-methyl-1,3-thiazole was
obtained as an oil.
[0359] .sup.1H-NMR (CDCl.sub.3): 7.74 (d, 1H); 7.53 (d, 1H); 7.35
(t, 1H); 7.25 (t, 1H); 6.64 (d, 1H); 6.23 (t, 1H); 3.51 (s, 2H);
3.34 (d, 2H); 2.43 (d, 3H); 1.47 (s, 6H).
7.2. Preparation of
2-[2-(indenyl)-2-methylpropyl]-4-methyl-1,3-thiazolechromium
dichloride
[0360] ##STR29##
[0361] A solution of
2-[2-(1H-inden-3-yl)-2-methylpropyl]-4-methyl-1,3-thiazole (5.62 g,
21 mmol) in 70 ml of tetrahydrofuran was cooled to -100.degree.
C.15% n-butyllithium in hexane (13.7 ml, 22 mmol) was added and the
resulting mixture stirred at this temperature for an additional 1
h. The reaction mixture was allowed to warm up to room temperature
(in about 2. h) and then cooled to 60.degree. C. 8.6 g (23 mmol) of
chromium trichloride tris(tetrahydrofuran) were added, the
resulting mixture allowed to warm to room temperature and then
stirred for 12 h. The green precipitate was filtered off and washed
twice with diethylether to give 4.3 g of green powder.
Recrystallization from a mixture of dichloromethane/diethylether
gave 2.7 g (33%) of
2-[2-(indenyl)-2-methylpropyl]-4-methyl-1,3-thiazolechromium
dichloride as dark green crystals.
Example 8
8.1. Preparation of
2-[2-(1H-inden-3-yl)-2-methylpropyl]-1-phenyl-1H-imidazole
[0362] A solution of 1.58 g 2-methyl-1-phenyl-1H-imidazole (10
mmol) in 15 ml of tetrahydrofuran was cooled to -78.degree. C. and
6.25 ml of 15% n-butyl-lithium in hexane (10 mmol) were added. The
resulting mixture was stirred for an additional 20 min and then
treated with a solution of 1.56 g 1-(1-methylethylidene)-1H-indene
(10 mmol) in 5 ml tetrahydrofuran with vigorous stirring while the
temperature was maintained at -78.degree. C. The reaction mixture
was allowed to reach room temperature, stirred for 14 h and
hydrolyzed with saturated ammonium chloride solution. The organic
layer was isolated and the aqueous layer was extracted three times
with dichloromethane. The organic layers were dried over
MgSO.sub.4, filtered and the solvent removed. The crude product was
purified by column chromatography with silica as stationary phase.
At the beginning a 5/1 hexane/ethyl actetate elution mixture was
used (for the separation from 1-(1-methylethylidene)-1H-indene).
Then, the elution mixture was changed to 1/1 hexane/ethyl actetate.
After removal of the solvent 2.13 g (69%) of
2-[2-(1H-inden-3-yl)-2-methylpropyl]-1-phenyl-1H-imidazole was
obtained as an oil.
[0363] .sup.1H-NMR (CDCl.sub.3): 7.41-7.37 (m, 5H); 7.16 (d, 1H);
7.14-7.07 (m, 3H); 6.97 (d, 1H); 6.15 (t, 1H); 3.19 (d, 2H); 3.17
(s, 2H); 1.35 (s, 6H).
8.2. Preparation of
2-[2-(indenyl)-2-methylpropyl]-1-phenyl-imidazolechromium
dichloride
[0364] ##STR30##
[0365] A solution of 0.71 g
2-[2-(1H-inden-3-yl)-2-methylpropyl]-1-phenyl-1H-imidazol (2.26
mmol) in 10 ml of tetrahydrofuran was cooled to -100.degree. C. 15%
n-butyllithium in hexane (1.48 ml, 2.37 mmol) was added and the
resulting mixture stirred at this temperature for an additional 1
h. The reaction mixture was allowed to warm up to room temperature
(in about 2 h) and then cooled to -60.degree. C. 0.9 g (2.4 mmol)
of chromium trichloride tris(tetrahydrofuran) were added, the
resulting mixture allowed to warm to room temperature and then
stirred for 12 h. Then the solvent was removed and the residue
extracted with dichloromethane. After removal of the solvent from
the extract, the crude product was recrystallized from a 5/1
mixture of dichloromethane/diethylether to give 0.37 g (38 %) of
2-[2-(indenyl)-2-methylpropyl]-1-phenylimidazolechromium dichloride
as a green-blue crystals.
Example 9
Polymerization
[0366] Polymerization was carried out at 40.degree. C. under argon
in a 1 l four-neck flask provided with contact thermometer, stirrer
with Teflon blade, heating mantle and gas inlet tube.
[0367] The appropriate amount of MAO (10% strength solution in
toluene, Cr:Al 1:500) was added to a solution of the amount
indicated in table 2 of the respective complex in 250 ml of toluene
and the mixture was heated to 40.degree. C. on a water bath. In the
case of the copolymerisation (see table 2), shortly before
introduction of ethylene, 3 ml of hexene were placed in the flask
and a further amount of hexene (see table 2) was introduced via a
dropping funnel over a period of 15 minutes after introduction of
the ethylene. Ethylene was subsequently passed through the flask at
a flow rate of about 20-40 l/h at atmospheric pressure (both for
homo- and copolymerisations). After the time indicated in table 2
under a constant ethylene flow, the polymerization was stopped by
addition of methanolic HCl solution (15 ml of concentrated
hydrochloric acid in 50 ml of methanol). 250 ml of methanol were
subsequently added and the resulting white polymer was filtered
off, washed with methanol and dried at 70.degree. C.
[0368] The catalysts of this invention show a particularly
interesting polymerization behavior. In the ethylene
homopolymerizations they give polymers with a broader molecular
weight distribution, which enhances the processing properties. In
the case of the ethylene copolymerizations, the molecular weight
distribution of the obtained copolymers, which are in general
easier to process than HDPE, is very narrow, which results in
enhanced mechanical properties. All catalysts readily incorporate
high levels of comonomer.
[0369] In the case of A is of formula (IIIb) (catalyst of examples
7 and 8) the homopolymers and copolymers have almost the same
molecular weight, which indicates that the comonomer does not or
only slightly effect the termination of the polymerization. In
polymerizations with metallocenes, such as zirconocene dichloride,
comonomers usually lead to a significant reduction of the molecular
weight of the polymer. TABLE-US-00001 TABLE 2 Polymerization
results Prod. cat. of Amount of cat. t(poly) Polymer [g/mmol Cr
M.sub.w Density example [mg] Hexen [min] [g] h] [g/mol]
M.sub.w/M.sub.n CH.sub.3/1000C [g/cm.sup.3] 5 31.3 no 30 20.4 1303
123648 6.63 4.9 n.d. 5 18.1 7 20 11.3 1877 55033 3.11 11.8 0.92 6
23.7 no 20 5.74 726 76667 3.75 1.5 0.9572 6 22.1 6 15 10.3 1865
49946 2.61 11.3 0.9342 7 10.5 9 30 4.4 328 7528 2.41 12 n.d. 8 6.3
no 12 7.7 2666 52403 3.96 1.8 0.9653 8 11.9 8 20 16.9 1859 47257
2.44 23.1 0.9087
* * * * *