U.S. patent application number 12/063480 was filed with the patent office on 2009-05-07 for impregnating oil composition for sintered bearing, bearing apparatus and sliding member.
Invention is credited to Ken Kawata, Masayuki Negoro.
Application Number | 20090118146 12/063480 |
Document ID | / |
Family ID | 37771745 |
Filed Date | 2009-05-07 |
United States Patent
Application |
20090118146 |
Kind Code |
A1 |
Negoro; Masayuki ; et
al. |
May 7, 2009 |
IMPREGNATING OIL COMPOSITION FOR SINTERED BEARING, BEARING
APPARATUS AND SLIDING MEMBER
Abstract
The novel impregnating oil composition for a sintered bearing is
disclosed. The composition comprises a base oil, at least one
compound represented by a formula (1). ##STR00001## In the formula,
D represents an m-valent cyclic group capable of binding to "m" of
--X--R; each X represents a single bond or a bivalent linking group
selected from the group consisting of NR.sup.1, where R.sup.1 is a
hydrogen atom or a C.sub.1-30 alkyl group, oxygen, sulfur,
carbonyl, sulfonyl and any combinations thereof; each R represents
a substituted or non-substituted, alkyl group, alkenyl group,
alkynyl group, aryl group or heterocyclic group, or a halogen atom,
hydroxy, amino, mercapto, cyano, sulfide, carboxy or salt thereof,
a sulfo or salt thereof, hydroxylamine, ureido or urethane; and m
is an integer from 2 to 11.
Inventors: |
Negoro; Masayuki; (Kanagawa,
JP) ; Kawata; Ken; (Kanagawa, JP) |
Correspondence
Address: |
BUCHANAN, INGERSOLL & ROONEY PC
POST OFFICE BOX 1404
ALEXANDRIA
VA
22313-1404
US
|
Family ID: |
37771745 |
Appl. No.: |
12/063480 |
Filed: |
August 25, 2006 |
PCT Filed: |
August 25, 2006 |
PCT NO: |
PCT/JP2006/317282 |
371 Date: |
February 11, 2008 |
Current U.S.
Class: |
508/100 ;
508/258 |
Current CPC
Class: |
C10M 2203/065 20130101;
C10M 2227/09 20130101; C10M 2205/026 20130101; C10M 2215/222
20130101; C10M 2215/221 20130101; C10M 2215/068 20130101; C10M
2223/08 20130101; C10M 2215/064 20130101; C10M 2205/028 20130101;
C10N 2020/079 20200501; F16C 33/109 20130101; C10M 2205/0285
20130101; F16C 33/10 20130101; C10M 2219/102 20130101; C10M
2227/062 20130101; C10M 2219/044 20130101; C10M 2219/104 20130101;
C10N 2040/02 20130101; C10M 2205/0265 20130101; F16C 33/104
20130101; C10M 2215/223 20130101; C10M 2215/225 20130101; C10M
2207/282 20130101; C10M 2219/086 20130101; F16C 33/14 20130101;
F16C 2220/20 20130101; C10M 2209/084 20130101; C10M 2223/043
20130101; C10M 169/04 20130101; C10M 2205/026 20130101; C10M
2205/022 20130101; C10M 2205/0265 20130101; C10M 2205/0225
20130101 |
Class at
Publication: |
508/100 ;
508/258 |
International
Class: |
C10M 133/42 20060101
C10M133/42 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 26, 2005 |
JP |
2005-246318 |
Claims
1. An impregnating oil composition for a sintered bearing,
comprising: a base oil, at least one compound represented by a
formula (1) shown below: Formula (1) ##STR00388## where D
represents an m-valent cyclic group capable of binding to "m" of
--X--R; each X represents a single bond or a bivalent linking group
selected from the group consisting of NR.sup.1, where R.sup.1 is a
hydrogen atom or a C.sub.1-30 alkyl group, oxygen, sulfur,
carbonyl, sulfonyl and any combinations thereof; each R represents
a substituted or non-substituted, alkyl group, alkenyl group,
alkynyl group, aryl group or heterocyclic group, or a halogen atom,
hydroxy, amino, mercapto, cyano, sulfide, carboxy or salt thereof,
sulfo or salt thereof, hydroxylamine, ureido or urethane; and m is
an integer from 2 to 11.
2. The impregnating oil composition of claim 1, wherein the base
oil contains synthetic hydrocarbon.
3. The impregnating oil composition of claim 1 or, wherein the base
oil contains at least one type of poly-alpha-olefin,
poly-alpha-olefin hydrate, ethylene-alpha-olefin copolymer,
ethylene-alpha-olefin copolymer hydrate, a mixture of
poly-alpha-olefin or hydrate thereof and alkyl naphthalene, a
mixture of ethylene-alpha-olefin copolymer or hydrate thereof and
alkyl naphthalene.
4. The impregnating oil composition of claim 1, comprising the
compound represented by the formula (1) in an amount from 0.1 to 10
weight % with respect to the total weight of the composition.
5. The impregnating oil composition of claim 1, wherein the base
oil comprises alkyl naphthalene in an amount from of 50 to 99.9
weight % and poly-alpha-olefin hydrate or ethylene-alpha-olefin
copolymer hydrate in an amount from 50 to 0.1 weight % with respect
to the total weight of the base oil.
6. The impregnating oil composition of claim 1, wherein D, in the
formula (1), represents a cyclic group of any one of formulae [1]
to [9], [11] to [36] and [36a] to [74]: ##STR00389## ##STR00390##
##STR00391## ##STR00392## ##STR00393## ##STR00394## ##STR00395##
##STR00396## ##STR00397## where n is an integer of 2 or greater
than 2, "*" represents a position capable of binding to a side
chain, and when two or more positions are marked by "*", it is not
necessary that all positions marked by "*" are binding to side
chains; M is a metal ion or two hydrogen atoms.
7. The impregnating oil composition of claim 1, wherein D, in the
formula (1), represents a five-, six- or seven-membered
heterocyclic residue.
8. The impregnating oil composition of claim 1, wherein the
compound represented by the formula (1) is a compound represented
by a formula (2) shown below: ##STR00398## where X.sup.1, X.sup.2
and X.sup.3 respectively represent a single bond or a bivalent
linking group selected from the group consisting of NR.sup.1, where
R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl group, oxygen,
sulfur, carbonyl, sulfonyl and any combinations thereof; R.sup.11,
R.sup.12 and R.sup.13 respectively represent a substituted or
non-substituted, alkyl group, alkenyl group, alkynyl group, aryl
group or heterocyclic group, or a halogen atom, hydroxy, amino,
mercapto, cyano, sulfide, carboxy or salt thereof, sulfo or salt
thereof, hydroxylamine, ureido or urethane.
9. The impregnating oil composition of claim 1, wherein the
compound represented by the formula (1) is a compound represented
by a formula (3) shown below: ##STR00399## where X.sup.21, X.sup.22
and X.sup.23 respectively represent a single bond or a bivalent
linking group selected from the group consisting of NR.sup.1, where
R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl group, oxygen,
sulfur, carbonyl, sulfonyl and any combinations thereof; R.sup.21,
R.sup.22 and R.sup.23 respectively represent a substituent; and
a21, a22 and a23 respectively represent an integer from 1 to 5.
10. A bearing apparatus for bearing a rotating element rotatably
comprising a sliding part wherein at least a part of the sliding
part is a sintered body impregnated with a composition as set forth
in claim 1.
11. A sliding member comprising a sintered body impregnated with a
composition as set forth claim 1.
12. The sliding member of claim 11, wherein the sintered body is
porous and the composition is within the pores of the sintered
body.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to an impregnating oil composition for
a sintered bearing to be used as a sliding part or the like in
slide-bearing apparatuses which have been used industrially; and
more specifically, the invention relates to the impregnating oil
composition capable of forming films and contributing to
lengthening life-times of bearing apparatuses. The invention also
relates to a bearing apparatus employing the composition.
[0003] 2. Related Art
[0004] One feature of a bearing apparatus, employing a sintered
body impregnated with lubricating oil as a sliding plane, resides
in that it can work without refueling, and, thus, it has been
employed in small size motors which can be operated relatively high
speed or are used for relatively light load. Along with the
popularization of small size motors, such bearing apparatuses have
been employed in the various technical fields such as automobiles,
audio equipments, office equipments, home electric equipments and
agricultural machines. And, along with the advance in qualities of
such various equipments or the like, the requests for qualities of
bearings employed in such equipments have been higher and more
diversified, and, in order to respond such requests, it is
necessary to provide high lubricating techniques. Although,
previously, researches and developments have been made on materials
to be used as bearing members, recently, there is tendency to think
that researches and developments on impregnating lubricant oils for
bearing members are more important than those on materials of
bearing members. One of the grounds thereof is that lubricant oils,
employed in bearing apparatuses, are used in nearly equal to a
boundary lubrication state rather than in a fluid lubrication
state. The bearing ability of a bearing apparatus may remarkably
depend on the property of lubricant oil with which the sintered
body is impregnated. And, lubricant oils exhibiting a high ability
of forming films are required.
[0005] Generally, bearing oils are required to exhibit a low
current value (i.e. to use much less power), to penetrate readily,
to deteriorate with age hardly (i.e. to exhibit a high ability of
forming films), to work with a wide service temperature range from
a low temperature to a high temperature (for example, from -40 to
120.degree. C.), to withstand high speed (about 30,000 rpm) and low
speed (60-180 rpm) and the like.
[0006] Examples of the conventional impregnating oil for a sintered
bearing, include mineral oil such as paraffin-base or
naphthene-base crude oil; and synthetic oil such as diester, polyol
ester and poly-alpha-olefin, and they may be selected depending on
their properties. However, they are not provided as
exclusively-used bearing oils, and, at present, they are selected
from commercially available hydraulic actuation oils and engine
oils.
[0007] Generally, mineral base oil in mineral oil-base lubricant
may be added with various additives such as an antioxidant, an
anti-rusting agent, an anti-wear agent, an antifoaming agent and an
metal deactivator, and, if necessary, other additives such as a
detergent additive, an viscosity index improver and a pour-point
depressant.
[0008] Automotive engine oils and poly-alpha-olefin hydrides
employed in various applications such as ATF have been considered
as appropriate base oils which can be employed in lubricants with a
wide service temperature range from a low temperature to a high
temperature, since they exhibit good properties in a low
temperature range and small evaporative loss. If mineral oil is
used as base oil, paraffin ingredients in mineral oil may
precipitate as wax at a low temperature, and such precipitation may
result in an increase of the current value; and impurities or
additives reacting therewith in mineral oil may precipitate as
sludge at a high temperature, and such precipitation may accelerate
bearing wear and also result in the increase of the current value.
Therefore, synthetic oils, not containing impurities and exhibiting
a high dissolving power for sludge, may be preferably used.
[0009] A bearing oil composition for sintered oil-impregnated body,
which is a long-life oil, does not form sludge during service, and
can be used with a wide service temperature range of service
temperature, is disclosed in JPA No. hei 7-53984 (the term "JPA" as
used herein means an "unexamined published Japanese patent
application (Kohkai Tokkyo Kohou)"). The composition is prepared by
adding at least one additive selected from zinc
dialkyldithiophosphate, Mo dialkyldithiocarbamate, Mo
dialkyldithiophosphate and a sulfur-phosphorus extreme pressure
additive to particular synthetic base oil.
[0010] A bearing oil composition for sintered oil-impregnated body,
which is capable of manifesting excellent oil film-forming
properties, can be used with a wide service temperature range,
exhibits good lubricating properties and is a long-life oil, is
disclosed in JPA No. hei 10-287892. The composition is prepared by
adding a predetermined amount of a phosphoric ester to particular
synthetic base oil.
SUMMARY OF THE INVENTION
[0011] One object of the present invention is to provide an
impregnating oil composition for a sintered bearing, which exhibits
a high ability of forming films and excellent lubricating
properties, can be used with a wide service temperature range and
is long-life.
[0012] Another object of the invention is to provide a bearing
apparatus which is long-life and is capable of working stably, and
to provide a sliding member useful for a bearing apparatus.
[0013] In one aspect, the invention provides an impregnating oil
composition for a sintered bearing, comprising:
[0014] a base oil,
[0015] at least one compound represented by a formula (1) shown
below:
##STR00002##
[0016] where D represents an m-valent cyclic group capable of
binding to "m" of --X--R; each X represents a single bond or a
bivalent linking group selected from the group consisting of
NR.sup.1, where R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl
group, oxygen, sulfur, carbonyl, sulfonyl and any combinations
thereof; each R represents a substituted or non-substituted, alkyl
group, alkenyl group, alkynyl group, aryl group or heterocyclic
group, or a halogen atom, hydroxy, amino, mercapto, cyano, sulfide,
carboxy or salt thereof, sulfo or salt thereof, hydroxylamine,
ureido or urethane; and m is an integer from 2 to 11.
[0017] The base oil may contain synthetic hydrocarbon; the
impregnating oil composition, wherein the base oil contains at
least one type of poly-alpha-olefin, poly-alpha-olefin hydrate,
ethylene-alpha-olefin copolymer, ethylene-alpha-olefin copolymer
hydrate, a mixture of poly-alpha-olefin or hydrate thereof and
alkyl naphthalene, a mixture of ethylene-alpha-olefin copolymer or
hydrate thereof and alkyl naphthalene.
[0018] As embodiments of the invention, the impregnating oil
composition comprising the compound represented by the formula (1)
in an amount from 0.1 to 10 weight % with respect to the total
weight of the composition; and the impregnating oil composition
wherein the base oil comprises alkyl naphthalene in an amount from
of 50 to 99.9 weight % and poly-alpha-olefin hydrate or
ethylene-alpha-olefin copolymer hydrate in an amount from 50 to 0.1
weight % with respect to the total weight of the base oil; are
provided.
[0019] In the formula (1), D may represent a cyclic group of any
one of formulae [1] to [74]:
##STR00003## ##STR00004## ##STR00005## ##STR00006## ##STR00007##
##STR00008## ##STR00009## ##STR00010## ##STR00011##
[0020] where n is an integer of 2 or bigger than 2, "*" represents
a position capable of binding to a side chain, and when two or more
positions are marked by "*", it is not necessary that all positions
marked by "*" are binding to side chains; M is a metal ion or two
hydrogen atoms.
[0021] In the formula (1), D may represent a five-, six- or
seven-membered heterocyclic residue.
[0022] The compound represented by the formula (1) may be selected
from the group represented by a formula (2) or (3) shown below:
##STR00012##
[0023] where X.sup.1, X.sup.2 and X.sup.3 respectively represent a
single bond or a bivalent linking group selected from the group
consisting of NR.sup.1, where R.sup.1 is a hydrogen atom or a
C.sub.1-30 alkyl group, oxygen, sulfur, carbonyl, sulfonyl and any
combinations thereof; R.sup.11, R.sup.12 and R.sup.13 respectively
represent a substituted or non-substituted, alkyl group, alkenyl
group, alkynyl group, aryl group or heterocyclic group, or a
halogen atom, hydroxy, amino, mercapto, cyano, sulfide, carboxy or
salt thereof, sulfo or salt thereof, hydroxylamine, ureido or
urethane;
##STR00013##
[0024] where X.sup.21, X.sup.22 and X.sup.23 respectively represent
a single bond or a bivalent linking group selected from the group
consisting of NR.sup.1, where R.sup.1 is a hydrogen atom or a
C.sub.1-30 alkyl group, oxygen, sulfur, carbonyl, sulfonyl and any
combinations thereof; R.sup.21, R.sup.22 and R.sup.23 respectively
represent a substituent; and a21, a22 and a23 respectively
represent an integer from 1 to 5.
[0025] In another aspect, the invention provides a bearing
apparatus for bearing a rotating element rotatably comprising a
sliding part wherein at least a part of the sliding part is a
sintered body impregnated with a composition of the invention; and
a sliding member comprising a sintered body impregnated with a
composition of the invention.
PREFERRED EMBODIMENT OF THE INVENTION
[0026] The present invention will be described in detail. It is to
be understood, in this description, that the term " . . . to ." is
used as meaning a range inclusive of the lower and upper values
disposed therebefore and thereafter.
[0027] The invention relates to an impregnating oil composition for
a sintered bearing. The composition of the invention comprises at
least one compound selected from the group represented by a formula
(1).
##STR00014##
[0028] In the formula, D represents an m-valent cyclic group
capable of binding to "m" of --X--R; each X represents a single
bond or a bivalent linking group selected from the group consisting
of NR.sup.1, where R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl
group, oxygen, sulfur, carbonyl, sulfonyl and any combinations
thereof; each R represents a substituted or non-substituted, alkyl
group, alkenyl group, alkynyl group, aryl group or heterocyclic
group, or a halogen atom, hydroxy, amino, mercapto, cyano, sulfide,
carboxy or salt thereof (carboxylate), a sulfo or salt thereof
(sulfate), hydroxylamine, ureido or urethane; and m is an integer
from 2 to 11.
[0029] The compound represented by the formula (1) has a cyclic
group, "D", and m, representing an integer from 2 to 11, of side
chains, "(R--X--)". In this description, the term of "discotic
compound" is used for any compounds having a discotic segment in
the central portion of a molecule structure. The discotic segment
is a central segment without the side chain segment, and to use an
original form thereof, namely a hydrogenised compound, as an
example, the structural feature of such a central segment can be
explained as follows:
[0030] A molecular size of a hydrogenised compound, which can be an
original form of a discotic compound, may be obtained by 1) to 5)
steps.
[0031] 1) To create a possible planar, desirably an exact planar,
molecule structure for a target molecule. For creating, standard
bond-length and bond-angle values based on orbital hybridization
are desirably used, and such standard values can be obtained with
reference to the 15th chapter in the second volume of "Chemical
Handbook, revised version 4, Foundation Section (Kagaku Binran
Kaitei 4 Kisohen)" compiled by The Chemical Society of Japan,
published by MARUZEN in 1993.
[0032] 2) To optimize a molecular structure using the
above-obtained planar structure as a default by molecular orbital
method or molecular mechanics method. Examples of such methods
include Gaussian92, MOPAC93, CHARMm/QUANTA and MM3, and Gaussian92
is desirably selected.
[0033] 3) To move a centroid of the optimized structure to an
origin position and to create a coordinate having an axis equal to
a principal axis of inertia (a principal axis of a inertia tensor
ellipsoid).
[0034] 4) To set a sphere defined by van der Waals radius in each
atom positions thereby drawing a molecular structure.
[0035] 5) To calculate lengths along to three coordinate axes on
van der Waals surface thereby obtaining "a", "b" and "c".
[0036] Using "a", "b" and "c" obtained trough the steps 1) to 5),
"a discotic structure" can be defined as a structure which
satisfies a.gtoreq.b>c and a.gtoreq.b.gtoreq.a/2, and a
preferred example of the discotic structure is a structure which
satisfying a.gtoreq.b>c and a.gtoreq.b.gtoreq.0.7a or
b/2>c.
[0037] Examples of the hydrogenated compound, which can be an
original form of a discotic compound, include mother cores and
derivatives described in various literatures such as "Ekisho no
Kagaku (Science of Liquid Crystal), edited by the Chemical Society
of Japan, Seasonal Chemical Review No. 22, Chapter 5, and Chapter
10, Section 2 (1994); C. Destrade et al., Mol. Crysr. Liq. Cryst.,
vol. 71, p. 111 (1981); B. Kohne et al., Angew. Chem. Vol. 96, p.
70; compounds described in J. M. Lehn et al., J. Chem. Soc. Chem.
Commun., p. 1794 (1985); and J. Zhang et al., J. Am. Chem. Soc.,
vol. 116, p. 2655 (1994). More specific examples of the
hydrogenated compound include benzene derivatives, tri phenylene
derivatives, truxene derivatives, phthalocyanine derivatives,
porphyrin derivatives, anthracene derivatives hexaethynylbenzene
derivatives, dibenzopyrene derivatives, coronene derivatives and
phenylacetylene macrocycl derivatives. The examples also include
cyclic compounds described in "Chemical Review (Kagaku Sousetsu)
No. 15 Chemistry of Novel Aromatic Series (Atarashii Houkouzoku no
Kagaku)" compiled by the Chemical Society of Japan, published by
University of Tokyo Press in 1977; and electronic structures such
as heteroatom-substituted compounds thereof.
[0038] Examples of the cyclic group represented by D include aryl
groups and heterocyclic groups. Examples of the aryl rings in the
aryl group include a benzene ring, an indene ring, a naphthalene
ring, a triphenylene ring, a fluorene ring, a phenanthrene ring, an
anthracene ring and a pyrene ring. The aryl group may have one or
more substituents.
[0039] The heterocyclic group is desirably selected from 5-, 6- or
7-membered heterocyclic groups, more desirably from 5- or
6-membered heterocyclic groups, and much more desirably from
6-membered heterocyclic groups. One or more hetero atoms embedded
in the heterocycle are desirably selected from the group consisting
of nitrogen, oxygen and sulfur atoms. Aromatic heterocycles are
preferred. An aromatic heterocycle usually belongs to the group of
unsaturated heterocycles, and unsaturated heterocyclic groups
having maximum double bonds are more preferred. Examples of the
heterocycle include furan ring, thiophene ring, pyrrole ring,
pyrroline ring, pyrrolizine ring, oxazole ring, isoxazole ring,
thiazole ring, isothiazole ring, imidazole ring, imidazoline ring,
imidazolidine ring, pyrazole ring, pyrazoline ring, pyrazolidine
ring, triazole ring, furazan ring, tetrazole ring, pyrane ring,
thyine ring, pyridine ring, piperidine ring, oxazine ring,
morpholine ring, thiazine ring, pyridazine ring, pyrimidine ring,
pyrazine ring, piperazine ring and triazine ring. Triazine ring is
preferred and 1,3,5-triazine ring is more preferred. The
heterocycle may be condensed with other heterocycle(s), or at least
one aliphatic ring or aryl ring. Mono heterocyclic groups are
preferred.
[0040] Preferred examples of the cyclic group D include the groups
[1] to [74] shown below:
##STR00015## ##STR00016## ##STR00017## ##STR00018## ##STR00019##
##STR00020## ##STR00021## ##STR00022## ##STR00023##
[0041] In the formula, n is an integer of 2 or more, and is
preferably 3 or more.
[0042] In the formula, "*" shows a position capable of binding to a
side chain. When two or more positions are marked by "*", it is not
necessary that all positions marked by "*" are binding to side
chains.
[0043] In the formula, M is a metal ion or two hydrogen atoms.
[0044] It is preferred that the mother core is a pi-conjugated
system skeleton in which at least one polar atom is embedded. Among
the above, the groups of [1], [2], [3], [6], [11], [12], [21],
[23], [28] and [56] are preferred; the groups of [1], [2], [3],
[6], [11] and [21] are more preferred; and the groups of [1], [2]
and [3] are much more preferred.
[0045] In the formula (1), each X represents a single bond or a
bivalent linking group selected from the group consisting of
NR.sup.1, where R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl
group, oxygen, sulfur, carbonyl, sulfonyl and any combinations
thereof. In the case that X is a single bond, it may bind directly
to nitrogen atom, having free atomic valence, of a heterocyclic
group such as a piperidine residue, or may bind to a heteroatom not
having free atomic valence to form an onium salt such as an oxonium
salt, sulfonium salt or ammonium salt. It is preferred that X is a
sulfur atom or NR.sup.1 in where R.sup.1 is preferably a hydrogen
atom or a C.sub.3 or shorter alkyl group.
[0046] In the formula (1), each R represents a substituted or
non-substituted, alkyl group, alkenyl group, alkynyl group, aryl
group or heterocyclic group, or a halogen atom, hydroxy, amino,
mercapto, cyano, sulfide, carboxy or slat thereof, sulfo or salt
thereof, hydroxylamine, ureido or urethane.
[0047] In the case that R is an alkyl group, R is preferably
selected from C.sub.1-40, more preferably from C.sub.2-20 and much
more preferably from C.sub.6-30 alkyl groups. The alkyl group may
have a linear or branched chain structure. And the alkyl group may
have one or more substituents. Examples of the substituent include
halogen atoms, C.sub.1-40, preferably C.sub.1-20, alkoxy groups
such as methoxy, ethoxy, methoxyethoxy and phenoxy; C.sub.1-40,
preferably C.sub.1-20, alkylthio groups and C.sub.6-40, preferably
C.sub.6-20, arylthio groups such as methylthio, ethylthio,
propylthio and phenylthio; C.sub.1-40, preferably C.sub.1-20,
alkylamino groups such as methylamino and propylamino; C.sub.1-40,
preferably C.sub.1-20, acyl groups such as acetyl, propanoyl,
octanoyl and benzoyl; C.sub.1-40, preferably C.sub.2-20, acyloxy
groups such as acetoxy, pivaloyloxy and benzoyloxy; hydroxyl,
mercapto, amino, carboxyl, sulfo, carbamoyl, sulfamoyl and
ureido.
[0048] In the case that R is an alkenyl group or an alkynyl group,
R is preferably selected from C.sub.2-40, more preferably from
C.sub.2-30, much more preferably from C.sub.4-30 and further much
more preferably from C.sub.6-30 alkenyl or alkynyl groups. The
alkenyl or alkynyl group may have a linear or branched chain
structure. The alkenyl or alkynyl group may have one or more
substituents selected from the groups exemplified above as
substituents of the alkyl group.
[0049] In the case that R is an aryl group, it is preferred that R
is phenyl, indenyl, alpha-naphthyl, beta-naphthyl, fluorenyl,
phenanthryl, anthracenyl or pyrenyl; and it is more preferred that
it is phenyl or naphthyl. The aryl group may have one or more
substituents. Examples of the substituent include C.sub.1-40 alkyl
groups and those exemplified above as substituents of the alkyl
group. It is preferred that the aryl group has one or more
substituents including a C.sub.8-30 linear or branched alkyl
residue, such as alkyl groups (e.g. octyl, decyl, hexadecyl and
2-ethylhexyl); alkoxy groups (e.g. dodecyloxy and hexadecyloxy);
sulfide groups (e.g. hexadecylthio); substituted amino groups (e.g.
heptadecyl amino), octyl carbamoyl, octanoyl and decyl sulfamoyl.
The aryl group preferably has two or more substituents selected
from the substituents containing a C.sub.8-30 linear or branched
alkyl residue. The aryl group may have one or more substituents
selected from other substituents such as halogen atoms, hydroxyl,
cyano, nitro, carboxyl and sulfo.
[0050] In the case that R is a heterocyclic group, R is preferably
selected from 5-, 6- or 7-membered heterocyclic groups, more
preferably selected from 5- or 6-membered heterocyclic groups, and
much more preferably selected from 6-membered heterocyclic groups.
Specific examples of such skeletons can be found in heterocycles
listed in "Iwanami Rikagaki Jiten (Iwanami's Physicochemical
Dictionary; Iwanami Shoten, Publishers), the 3rd edition,
supplement Chapter 11 "Nomenclature for Organic Chemistry", Table 4
"Names of Principal Hetero Monocyclic Compounds" on page 1606, and
Table 5 "Names of Principal Condensed Heterocyclic Compounds" on
page 1607. The heterocyclic groups are, similarly to the foregoing
aryl group, preferably substituted with a substituent including a
C.sub.8-39 linear or branched alkyl chain, where substitution by
two or more groups is more preferable. Specific examples of the
substituent including such chain are same as those described in the
above. The heterocyclic group may also be substituted by halogen
atom, hydroxyl, cyano, nitro, carboxyl, sulfo or the like, besides
the foregoing substituents.
[0051] It is preferred that at least one of R contains one or more
ester bonds; and it is more preferred that at least one of R is an
alkoxy group having one or more substituents containing a linear or
branched alkyl residue containing one or more ester bonds.
[0052] Further, it is preferred that each R contains one or more
ester bonds; and it is more preferred that each R is an alkoxy
group having one or more substituents containing a linear or
branched alkyl residue containing one or more ester bonds.
[0053] Namely, it is preferred that at least one of R contains a
group represented by a formula (4a) or (4b) described below; and it
is more preferred that at least one of R contains a group
represented by any of formulae (4) to (6) described below.
[0054] It is also preferred that at least one of R--X-- is a group
represented by a formula (7) described below; and it is more
preferred that each R--X-- is a group represented by the formula
(7).
[0055] Among the compounds represented by the formula (1), the
compounds having at least one side chain, i.e., R--X--, containing
one or more ester bonds are preferred. Especially, the compounds
having at least one side chain, i.e., R--X--, containing a group
represented by the formula (4a) or (4b) described below. It is
noted that the left end, i.e., --X.sup.0, in the formula (4a) or
(4b) binds to D in the formula (1).
##STR00024##
[0056] In the formula, X.sup.0 is a single bond or a bivalent
linking group selected from the group consisting of NR.sup.1, where
R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl group, oxygen,
sulfur, carbonyl, sulfonyl and any combinations thereof.
[0057] In the formulae, L.sup.0 represents a bivalent linking group
selected from the group consisting of linear, branched or cyclic,
preferably C.sub.1-20, alkylene groups, NR.sup.1, where R.sup.1W is
a hydrogen atom or C.sub.1-30 alkyl group, oxygen, sulfur,
carbonyl, sulfonyl or any combinations thereof. The bivalent
linking group may be substituted or non-substituted. L.sup.0
preferably represents an alkylene group.
[0058] Preferred examples of the combination of X.sup.0 and
L.sup.0, namely --X.sup.0-L.sup.0-, include --O(C.dbd.O)-alkylene-
and --O(C.dbd.O)-cycloalkylene-.
[0059] R.sup.0, which is located at the end of the side chain,
represents a substituted or non-substituted alkyl group or aryl
group. Preferred examples or definitions of the alkyl and aryl
groups represented by R.sup.o are same as those described above for
the alkyl and aryl groups represented by R.
[0060] It is preferred that at least one of side chains contains
the group represented by the formula (4a); and it is more preferred
that at least one of side chains contains the group represented by
a formula (4) described below. It is noted that the left end, i.e.,
-L.sup.01, in the formula (4) binds to D in the formula (1).
##STR00025##
[0061] In the formula, L.sup.01 has the same meaning of X.sup.0.
L.sup.01 is desirably selected from the group consisting of oxygen
atom, sulfur atom, --(C.dbd.O)O-- and --NH--(C.dbd.O)O--. R.sup.01
is a substituted or non-substituted C.sub.1-30 alkyl group; and p
and q respectively represent an integer. R.sup.01 is desirably
selected from substituted or non-substituted C.sub.1-40 alkyl
groups, and more desirably selected from C.sub.1-20 alkyl groups.
Examples of the substituent for the alkyl group include halogen
atoms, alkoxy groups such as methoxy, ethoxy, methoxyethoxy and
phenoxy; sulfide groups such as methylthio, ethylthio and
propylthio; alkylamino groups such as methylamino and propylamino;
acyl groups such as acetyl, propanoyl, octanoyl and benzoyl;
acyloxy groups such as acetoxy, pivaloyloxy and benzoyloxy; aryl
groups, heterocyclic groups, hydroxyl, mercapto, amino, cyano,
nitro, carboxyl, sulfo, carbamoyl, sulfamoyl and ureido. In the
formula, p is desirably an integer selected from 1 to 20, and more
desirably selected from 2 to 10. In the formula, q is desirably an
integer selected from 1 to 10, and is more desirably an integer
from 1 to 5.
[0062] The compounds in which at least one of the side chains
contains the group represented by a formula (5) or (6) described
below are also preferred.
##STR00026##
[0063] In the formula, R.sup.01 represents a substituted or
non-substituted C.sub.1-30 alkyl group; and m and n respectively
represent an integer. The definition and examples of R.sup.01 in
the formula (5) are same as it in the formula (4).
##STR00027##
[0064] In the formula, R.sup.25 represents a substituent and a24 is
an integer from 1 to 5.
[0065] The compounds in which at least one of the side chains
contains the group represented by a formula (7) described below are
also preferred.
##STR00028##
[0066] In the formula, L.sup.21 represents a single bond or a
bivalent linking group selected from the group consisting of
NR.sup.1, where R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl
group, oxygen, sulfur, carbonyl, sulfonyl and any combinations
thereof. L.sup.21 preferably represents an oxygen atom, an
oxyalkylene group, an oxycarbonyl group, an aminocarbonyl group, a
carbonyloxy group or a carbonyl group; and more preferably
represents an oxycarbonyl group or a carbonyl group.
[0067] Examples of the substituent R.sup.25, R.sup.71 or R.sup.72
include halogen atoms such as fluorine, chlorine and bromine;
C.sub.1-40, preferably C.sub.1-20, alkyl groups such as methyl,
ethyl, propyl, hexyl, octyl, 2-ethylhexyl, decyl, dodecyl,
tetradecyl, hexadecyl and octadecyl; C.sub.2-40, preferably
C.sub.2-20, alkenyl groups such as vinyl, 2-butene-1-yl and oleyl;
C.sub.2-40, preferably C.sub.2-20, alkynyl groups such as
propargyl; C.sub.6-40, preferably C.sub.6-20, aryl groups such as
phenyl and naphthyl; C.sub.1-40, preferably C.sub.1-20,
heterocyclic groups such as 2-furyl, 2-thienyl, 4-pyridyl,
2-imidazolyl, 2-benzothiazolyl, 2-benzoxazolyl and
1-benzoimidazolyl; cyano, hydroxyl, nitro, carboxyl, C.sub.1-40,
preferably C.sub.1-20, alkoxy groups such as methoxy, ethoxy,
hexyloxy, octyloxy, 2-ethylhexyloxy, decyloxy, dodecyloxy,
tetradecyloxy, hexadecyloxy and octadecyloxy; C.sub.6-40,
preferably C.sub.6-20, aryloxy groups such as phenoxy and
1-naphthoxy; C.sub.3-40, preferably C.sub.3-20, silyloxy groups
such as trimethyl silyloxy; C.sub.1-40, preferably C.sub.1-20,
heterocyclic oxy groups such as 2-furyloxy, 2-tetrahydro
pyranyloxy, 3-pyridyloxy and 2-imidazolyloxy; C.sub.2-40,
preferably C.sub.2-20, acyloxy groups such as acetoxy, butanoyloxy,
octanoyloxy, dodecanoyloxy and benzoyloxy; C.sub.1-40, preferably
C.sub.1-20, carbamoyloxy groups such as N,N-diethyl carbamoyloxy;
C.sub.2-40, preferably C.sub.2-20, alkoxy carbonyloxy groups such
as ethoxy carbonyloxy, butoxy carbonyloxy, 2-ethylhexyloxy
carbonyloxy, dodecyloxy carbonyloxy and hexadecyloxy carbonyloxy;
C.sub.7-40, preferably C.sub.7-20, aryloxy carbonyloxy groups such
as phenoxy carbonyloxy; C.sub.0-40, preferably C.sub.0-20, amino
groups such as non-substituted amino, N-methylamino,
N-2-ethylhexylamino, N-tetradecylamino, N,N-diethylamino and
N,N-dioctylamino; C.sub.1-40, preferably C.sub.1-20, acyl amino
groups such as acetylamino, octanoylamino and dodecanoylamino;
C.sub.1-40, preferably C.sub.1-20, aminocarbonylamino groups such
as N,N-dioctyl carbamoylamino; C.sub.2-40, preferably C.sub.2-20,
alkoxy carbonylamino groups such as methoxy carbonylamino, ethoxy
carbonylamino, 2-ethylhexyloxy carbonylamino and tetradecyloxy
carbonylamino; C.sub.7-40, preferably C.sub.7-20, aryloxy
carbonylamino groups such as phenoxy carbonylamino; C.sub.0-40,
preferably C.sub.0-20, sulfamoylamino groups such as N,N-dimethyl
sulfamoylamino; C.sub.1-40, preferably C.sub.1-20, alkyl- or
aryl-sulfonylamino groups such as methyl sulfonylamino, butyl
sulfonylamino, dodecyl sulfonylamino and p-toluene sulfonylamino;
mercapto; C.sub.1-40, preferably C.sub.1-20, alkylthio groups such
as methylthio, ethylthio, 2-ethylhexylthio and dodecylthio;
C.sub.6-40, preferably C.sub.6-20, arylthio groups such as
phenylthio; C.sub.1-40, preferably C.sub.1-20, heterocyclic thio
groups such as 4-pyridyl thio, thiazole-2-yl thio, benzoxazole-2-yl
thio, 1-phenyl tetrazole-5-yl thio and 1,3,4-thiadiazole-2-yl thio;
C.sub.0-40, preferably C.sub.0-20, sulfamoyl groups such as
non-substituted sulfamoyl, N,N-diethyl sulfamoyl and N-hexadecyl
sulfamoyl; sulfo; C.sub.1-40, preferably C.sub.1-20, alkyl- or
aryl-sulfinyl groups such as methylsulfinyl and phenylsulfinyl;
C.sub.1-40, preferably C.sub.1-20, alkyl- or aryl-sulfonyl groups
such as methylsulfonyl, butylsulfonyl, hexadecylsulfonyl and
p-tolylsulfonyl; C.sub.1-40, preferably C.sub.1-20, acyl groups
such as acetyl, propionyl, isobutyl, tetradecanoyl and benzoyl;
C.sub.7-40, preferably C.sub.7-20, aryloxycarbonyl groups such as
phenoxycarbonyl; C.sub.2-40, preferably C.sub.2-20, alkoxycarbonyl
groups such as ethoxycarbonyl, t-butoxycarbonyl and
hexadecyloxycarbonyl; C.sub.1-40, preferably C.sub.1-20, carbamoyl
groups such as non-substituted carbamoyl, N,N-diethylcarbamoyl and
N-dodecylcarbamoyl; C.sub.1-40, preferably C.sub.1-20, aryl- or
heterocyclic azo groups such as phenylazo,
3-methyl-1,2,4-oxadiazole-5-yl azo and
2-methylthio-1,3,4-thiadiazole-5-yl azo; C.sub.4-40, preferably
C.sub.4-20, imido groups such as succinimido and phthalimido;
C.sub.0-40, preferably C.sub.0-20, phosphino groups; C.sub.0-40,
preferably C.sub.0-20, phosphinyl groups; C.sub.0-40, preferably
C.sub.0-20, phosphinyloxy groups; C.sub.0-40, preferably
C.sub.0-20, phosphinylamino; and C.sub.3-40, preferably C.sub.3-20,
silyl groups such as trimethyl silyl and t-butyldimethyl silyl.
Examples of R.sup.25, R.sup.71 or R.sup.72 also include
substituents having one or more substituents selected from these.
Preferred examples of the substituent R.sup.71 include alkoxy,
alkoxycarbonyl and acyl groups having one or more substituents
containing a linear or branched alkyl residue. In the formula, "a"
is an integer from 0 to 5, and preferably from 1 to 3.
[0068] The carbon atom number of R.sup.71 is preferably from 1 to
40 and more preferably from 1 to 20.
[0069] It is also preferred that at least one of m of the side
chains, i.e., R--X--, includes a partially or totally fluorinated
carbon group. Namely, it is preferred that at least one of the
formulae (4a), (4b), (4), (5), (6) and (7) contains a partially or
totally fluorinated carbon group. The fluorinated carbon groups may
be selected from those containing one or more double bonds, those
having a linear or branched chain structure or a cyclic structure,
and those having one or more aryl rings.
[0070] Among the compounds represented by the formula (1), the
compounds represented by the formula (2) are preferred.
##STR00029##
[0071] In the formula (2), X.sup.1, X.sup.2 and X.sup.3
respectively represent a single bond or a bivalent linking group
selected from the group consisting of NR.sup.1, where R.sup.1 is a
hydrogen atom or a C.sub.1-30 alkyl group, oxygen, sulfur,
carbonyl, sulfonyl and any combinations thereof. In the case that
X.sup.1, X.sup.2 or X.sup.3 is a single bond, it may bind directly
to nitrogen atom, having free atomic valence, of a heterocyclic
group such as a piperidine residue, or may bind to a heteroatom not
having free atomic valence to form an onium salt such as an oxonium
salt, sulfonium salt or ammonium salt. In the case that X.sup.1,
X.sup.2 or X.sup.3 is not a single bond, it represents a bivalent
linking group selected from the group consisting of NR.sup.1, where
R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl group, oxygen,
sulfur, carbonyl, sulfonyl and any combinations thereof such as an
oxycarbonyl group, an aminocarbonyl group, ureylene group,
oxysulfonyl group and sulfamoyl group. Among these, a sulfur atom
or NR.sup.1 in which R.sup.1 is a hydrogen atom or a C.sub.3 or
shorter alkyl group. Among these, imino, i.e., --NH--, is most
preferred.
[0072] In the formula (2), R.sup.11, R.sup.12 and R.sup.13
respectively represent a substituted or non-substituted, alkyl
group, alkenyl group, alkynyl group, aryl group or heterocyclic
group, or a halogen atom, hydroxyl, amino, mercapto, cyano,
sulfide, carboxy or salt thereof (carboxylate), sulfo or salt
thereof (sulfate), hydroxylamino, ureido or urethane.
[0073] The alkyl group represented by R.sup.11, R.sup.12 or
R.sup.13 is desirably selected from C.sub.1-40, more desirably from
C.sub.2-30, much more desirably from C.sub.4-30 and further much
more desirably from C.sub.6-30 alkyl groups. The alkyl group may
have a linear or branched chain structure and may have one or more
substituents. Examples of the substituent include halogen atoms,
C.sub.1-40, preferably C.sub.1-20, alkoxy groups such as methoxy,
ethoxy, methoxyethoxy and phenoxy; C.sub.1-40, preferably
C.sub.1-20, alkylthio and C.sub.6-40, preferably C.sub.6-20,
arylthio groups such as methylthio, ethylthio, propylthio and
phenylthio; C.sub.1-40, preferably C.sub.1-20, alkylamino groups
such as methylamino and propylamino; C.sub.1-40, preferably
C.sub.1-20, acyl groups such as acetyl, propanoyl, octanoyl and
benzoyl; C.sub.1-40, preferably C.sub.1-20, acyloxy groups such as
acetoxy, pivaloyloxy and benzoyloxy; hydroxyl, mercapto, amino,
carboxyl, sulfo, carbamoyl, sulfamoyl and ureido.
[0074] In the case that R.sup.11, R.sup.12 or R.sup.13 is an
alkenyl or alkynyl group, their preferred carbon numbers is from 2
to 40, more preferably from 2 to 30, much more preferably from 4 to
30 and further much more preferably from 6 to 30. The alkenyl or
alkynyl group may have a linear or branched chain structure. The
alkenyl or alkynyl group may have one or more substituents. Example
of the substituent include those exemplified as the substituent of
the alkyl group.
[0075] In the case that R.sup.11, R.sup.12 or R.sup.13 is an aryl
group, it is preferred that R is phenyl, indenyl, alpha-naphthyl,
beta-naphthyl, fluorenyl, phenanthryl, anthracenyl or pyrenyl, and
it is more preferred that it is phenyl or naphthyl. The aryl group
may have one or more substituents. Examples of the substituent
include C.sub.1-40 alkyl groups and those exemplified above as
substituents of the alkyl group. It is preferred that the aryl
group has one or more substituents containing a C.sub.8-30 linear
or branched alkyl residue, such as alkyl groups (e.g. octyl, decyl,
hexadecyl and 2-ethylhexyl); alkoxy groups (e.g. dodecyloxy,
hexadecyloxy, 2-hexyldecyloxy and hexyloxyethyleneoxyethyleneoxy);
sulfide groups (e.g. hexadecylthio); substituted amino groups (e.g.
heptadecyl amino), octyl carbamoyl, octanoyl and decyl sulfamoyl.
The aryl group preferably has two or more substituents selected
from the substituents containing a C.sub.8-30 linear or branched
alkyl residue. The aryl group may have one or more substituents
selected from other substituents such as halogen atoms, hydroxyl,
cyano, nitro, carboxyl and sulfo.
[0076] The heterocyclic group represented by R.sup.11, R.sup.12 or
R.sup.13, is, similarly to D in the formula (1), preferably
selected from 5-, 6- or 7-membered heterocyclic groups, more
preferably selected from 5- or 6-membered heterocyclic groups, and
much more preferably selected from 6-membered heterocyclic groups.
Specific examples of such skeletons can be found in heterocycles
listed in "Iwanami Rikagaku Jiten (Iwanami's Physicochemical
Dictionary; Iwanami Shoten, Publishers), the 3rd edition,
supplement Chapter 11 "Nomenclature for Organic Chemistry", Table 4
"Names of Principal Hetero Monocyclic Compounds" on page 1606, and
Table 5 "Names of Principal Condensed Heterocyclic Compounds" on
page 1607. The heterocyclic groups are, similarly to the foregoing
aryl group, preferably have one or more substituents containing a
C.sub.8-30 linear or branched alkyl chain, where substitution by
two or more groups is more preferable. Specific examples of the
substituent containing such chain are same as those described in
the above. The heterocyclic group may also be substituted by
halogen atom, hydroxyl, cyano, nitro, carboxyl, sulfo or the like,
besides the foregoing substituents.
[0077] It is preferred that at least one of R.sup.11, R.sup.12 and
R.sup.13 contains one or more ester bonds, and, more preferably, is
an alkoxy group having one or more substituents containing a linear
or branched alkyl residue. It is more preferred that each of
R.sup.11, R.sup.12 and R.sup.13 contains one or more ester bonds,
and, more preferably, is an alkoxy group having one or more
substituents including a linear or branched alkyl residue. Namely,
it is preferred that at least one of R.sup.11, R.sup.12 and
R.sup.13 contains a group represented by the formula (4a) or (4b);
and, more preferably, contains a group represented by any one of
the formulae (4) to (6).
[0078] It is also preferred that at least one of
R.sup.11--X.sup.1--, R.sup.12--X.sup.2-- and R.sup.13--X.sup.3-- is
a group represented by the formula (7); and it is more preferred
that each of those is a group represented by the formula (7).
[0079] Among the compounds represented by the formula (2), the
compounds represented by the following formula (3) are
preferred.
##STR00030##
[0080] In the formula, X.sup.21, X.sup.22 and X.sup.23 respectively
represent a single bond or a bivalent linking group selected from
the group consisting of NR.sup.1, where R.sup.1 is a hydrogen atom
or a C.sub.1-30 alkyl group, oxygen, sulfur, carbonyl, sulfonyl and
any combinations thereof. In the case that X.sup.21, X.sup.22 or
X.sup.23 is a single bond, it may bind directly to nitrogen atom,
having free atomic valence, of a heterocyclic group such as a
piperidine residue, or may bind to a heteroatom not having free
atomic valence to form an onium salt such as an oxonium salt,
sulfonium salt and ammonium salt. In the case that X.sup.21,
X.sup.22 or X.sup.23 is not a single bond, it represents a bivalent
linking group selected from the group consisting of NR.sup.1, where
R.sup.1 is a hydrogen atom or a C.sub.1-30 alkyl group, oxygen,
sulfur, carbonyl, sulfonyl and any combinations thereof such as an
oxycarbonyl group, aminocarbonyl group, ureylene group, oxysulfonyl
group and sulfamoyl group. Among these, a sulfur atom or NR.sup.1
in which R.sup.1 is a hydrogen atom or a C.sub.3 or shorter alkyl
group. Among these, imino, i.e., --NH--, is most preferred.
[0081] In the formula, R.sup.21, R.sup.22 and R.sup.23 respectively
represent a substituent. Examples of the substituent R.sup.21,
R.sup.22 or R.sup.23 include halogen atoms, alkyl groups, alkenyl
groups, alkynyl groups, aryl groups, heterocyclic groups, cyano,
hydroxyl, nitro, carboxyl, alkoxy groups, aryloxy groups, silyloxy
groups, heteroxy groups, acyloxy groups, carbamoyloxy groups,
alkoxycarbonyloxy groups, aryloxycarbonyloxy groups, amino groups,
acylamino groups, aminocarbonylamino groups, alkoxy
aminocarbonylamino groups, aryloxycarbonylamino groups,
sulfamoylamino groups, alkyl- and aryl-sulfonylamino groups,
mercapto, alkylthio groups, arylthio groups, heterocyclic thio
groups, sulfamoyl groups, sulfo groups, alkyl- and aryl-sulfinyl
groups, alkyl- and aryl-sulfonyl groups, acyl groups,
aryloxycarbonyl groups, alkoxycarbonyl groups, carbamoyl groups,
aryl- and heterocyclic-azo groups, imido, phosphino groups,
phosphinyl groups, phosphinyloxy groups, phosphinylamino groups and
silyl groups. The preferred carbon numbers and preferred examples
of these groups are same as those described above for the
substituents R.sup.25, R.sup.71 and R.sup.72. Examples of the
substituent R.sup.21, R.sup.22 or R.sup.23 also include the
substituents having one or more substituents selected from the
examples exemplified above.
[0082] It is preferred that at least one of R.sup.21, R.sup.22 and
R.sup.23 contains one or more ester bonds, and, more preferably, is
an alkoxy group having one or more substituents containing a linear
or branched alkyl residue. It is more preferred that each of
R.sup.21, R.sup.22 and R.sup.23 contains one or more ester bonds,
and, more preferably, is an alkoxy group having one or more
substituents containing a linear or branched alkyl residue. Namely,
it is preferred that at least one of R.sup.11, R.sup.12 and
R.sup.13 contains a group represented by the formula (4a) or (4b);
and, more preferably, contains a group represented by any one of
the formulae (4) to (6).
[0083] It is also preferred that at least one of
(R.sup.21).sub.a21-Ph-X.sup.21--, (R.sup.22).sub.a22-Ph-X.sup.22--
and (R.sup.23).sub.a23-Ph-X.sup.23--R.sup.11--X.sup.1-- is a group
represented by the formula (7); and it is more preferred that each
of those is a group represented by the formula (7).
[0084] In the formula, a21, a22 and a23 respectively represents an
integer from 1 to 5.
[0085] Examples of the compound represented by the formula (1),
which can be employed in the invention, include, but are not
limited to, those shown below.
TABLE-US-00001 ##STR00031## D m X R B-1 ##STR00032## 2 --O--
--(CH.sub.2).sub.10CO.sub.2C.sub.8H.sub.17 B-2 ##STR00033## 2
##STR00034## ##STR00035## B-3 ##STR00036## 2 ##STR00037##
##STR00038## B-4 ##STR00039## 3 --O--
--(CH.sub.2).sub.7CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
B-5 ##STR00040## 3 --O--
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
B-6 ##STR00041## 3 ##STR00042##
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.3CH.sub.3 B-7
##STR00043## 4 --S-- ##STR00044## B-8 ##STR00045## 4 --O--
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
B-9 ##STR00046## 6 --O--
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
B-10 ##STR00047## 6 ##STR00048## ##STR00049## E-1 ##STR00050## 3
##STR00051## ##STR00052## E-2 ##STR00053## 3 ##STR00054##
##STR00055## E-3 ##STR00056## 3 ##STR00057## ##STR00058## E-4
##STR00059## 3 ##STR00060## ##STR00061## E-5 ##STR00062## 3
##STR00063## ##STR00064## E-6 ##STR00065## 3 ##STR00066##
##STR00067## E-7 ##STR00068## 3 ##STR00069## ##STR00070## E-8
##STR00071## 3 ##STR00072## ##STR00073## E-9 ##STR00074## 3
##STR00075## ##STR00076## E-10 ##STR00077## 3 ##STR00078##
##STR00079## E-11 ##STR00080## 3 ##STR00081## ##STR00082## E-12
##STR00083## 3 ##STR00084## ##STR00085## E-13 ##STR00086## 3
##STR00087## ##STR00088## E-14 ##STR00089## 3 ##STR00090##
##STR00091## E-15 ##STR00092## 3 ##STR00093## ##STR00094## E-16
##STR00095## 3 ##STR00096## ##STR00097## E-17 ##STR00098## 3
##STR00099## ##STR00100## E-18 ##STR00101## 3 ##STR00102##
##STR00103## E-19 ##STR00104## 3 ##STR00105## ##STR00106## E-20
##STR00107## 3 ##STR00108## ##STR00109## E-21 ##STR00110## 3
##STR00111## ##STR00112## E-22 ##STR00113## 3 ##STR00114##
##STR00115## E-23 ##STR00116## 3 ##STR00117## ##STR00118## E-24
##STR00119## 3 ##STR00120## ##STR00121## E-25 ##STR00122## 3
##STR00123## ##STR00124## E-26 ##STR00125## 3 ##STR00126##
##STR00127## E-27 ##STR00128## 3 ##STR00129## ##STR00130## E-28
##STR00131## 3 ##STR00132## ##STR00133## E-29 ##STR00134## 3
##STR00135## ##STR00136## E-30 ##STR00137## 3 ##STR00138##
##STR00139## E-31 ##STR00140## 3 ##STR00141## ##STR00142## E-32
##STR00143## 3 ##STR00144## ##STR00145## E-33 ##STR00146## 3
##STR00147## ##STR00148## E-34 ##STR00149## 3 ##STR00150##
##STR00151## E-35 ##STR00152## 3 ##STR00153## ##STR00154## E-36
##STR00155## 3 ##STR00156## ##STR00157## E-37 ##STR00158## 3
##STR00159## ##STR00160## E-38 ##STR00161## 3 ##STR00162##
##STR00163## E-39 ##STR00164## 3 ##STR00165## ##STR00166## E-40
##STR00167## 3 ##STR00168## ##STR00169## E-41 ##STR00170## 3
##STR00171## ##STR00172## E-42 ##STR00173## 3 ##STR00174##
##STR00175## E-43 ##STR00176## 3 ##STR00177## ##STR00178## E-44
##STR00179## 3 ##STR00180## ##STR00181## E-45 ##STR00182## 3
##STR00183## ##STR00184## E-46 ##STR00185## 3 ##STR00186##
##STR00187## E-47 ##STR00188## 3 ##STR00189## ##STR00190## E-48
##STR00191## 3 ##STR00192## ##STR00193## E-49 ##STR00194## 3
##STR00195## ##STR00196## E-50 ##STR00197## 3 ##STR00198##
##STR00199## E-51 ##STR00200## 3 ##STR00201## ##STR00202## E-52
##STR00203## 3 ##STR00204## ##STR00205## E-53 ##STR00206## 3
##STR00207## ##STR00208## E-54 ##STR00209## 3 ##STR00210##
##STR00211## E-55 ##STR00212## 3 ##STR00213## ##STR00214## E-56
##STR00215## 3 ##STR00216## ##STR00217## E-57 ##STR00218## 3
##STR00219## ##STR00220## E-58 ##STR00221## 3 ##STR00222##
##STR00223## E-59 ##STR00224## 3 ##STR00225## ##STR00226## E-60
##STR00227## 3 ##STR00228## ##STR00229## L-1 ##STR00230## 3
##STR00231## ##STR00232## L-2 ##STR00233## 3 ##STR00234##
##STR00235## L-3 ##STR00236## 3 ##STR00237## ##STR00238## L-4
##STR00239## 3 ##STR00240## ##STR00241## L-5 ##STR00242## 3
##STR00243## ##STR00244## L-6 ##STR00245## 3 --O-- ##STR00246## L-7
##STR00247## 3 --O-- ##STR00248## L-8 ##STR00249## 3 --O--
##STR00250## L-9 ##STR00251## 3 --O-- ##STR00252## L-10
##STR00253## 3 --O-- ##STR00254## L-11 ##STR00255## 3 ##STR00256##
##STR00257## L-12 ##STR00258## 3 ##STR00259## ##STR00260## L-13
##STR00261## 3 ##STR00262## ##STR00263## L-14 ##STR00264## 3 --O--
##STR00265## L-15 ##STR00266## 3 --O-- ##STR00267## H-1
##STR00268## 4 --S-- --(CH.sub.2).sub.10CO.sub.2CH.sub.3 H-2
##STR00269## 3 -- --(CH.sub.2).sub.10CO.sub.2C.sub.8H.sub.17 H-3
##STR00270## 6 --O-- ##STR00271## H-4 ##STR00272## 3 ##STR00273##
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
H-5 ##STR00274## 4 ##STR00275##
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
N-1 ##STR00276## 3 ##STR00277## --(CH.sub.2).sub.10CO.sub.2CH.sub.3
N-2 ##STR00278## 3 ##STR00279##
--(CH.sub.2).sub.10CO.sub.2C.sub.8H.sub.17 N-3 ##STR00280## 3
##STR00281## --(CH.sub.2).sub.10CO.sub.2C.sub.12H.sub.25 N-4
##STR00282## 3 ##STR00283##
--(CH.sub.2).sub.10CO.sub.2CH.sub.2CH.sub.2C.sub.8F.sub.17 N-5
##STR00284## 3 ##STR00285## ##STR00286## N-6 ##STR00287## 3
##STR00288##
--(CH.sub.2).sub.4CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
N-7 ##STR00289## 3 ##STR00290##
--(CH.sub.2).sub.7CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
N-8 ##STR00291## 3 ##STR00292##
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
N-9 ##STR00293## 3 ##STR00294##
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.3CH.sub.3 N-10
##STR00295## 3 ##STR00296##
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.4C.sub.12H.sub.25
N-21 ##STR00297## 3 ##STR00298## ##STR00299## N-22 ##STR00300## 3
##STR00301## ##STR00302## N-23 ##STR00303## 3 ##STR00304##
##STR00305## N-24 ##STR00306## 3 ##STR00307## ##STR00308## N-25
##STR00309## 3 ##STR00310## ##STR00311## N-26 ##STR00312## 3
##STR00313## ##STR00314## N-27 ##STR00315## 3 ##STR00316##
##STR00317## N-28 ##STR00318## 3 ##STR00319## ##STR00320## N-29
##STR00321## 3 ##STR00322## ##STR00323## N-30 ##STR00324## 3
##STR00325## ##STR00326## N-31 ##STR00327## 3 ##STR00328##
##STR00329## N-32 ##STR00330## 3 ##STR00331## ##STR00332## N-33
##STR00333## 3 ##STR00334## ##STR00335## N-34 ##STR00336## 3
##STR00337## ##STR00338## N-35 ##STR00339## 3 ##STR00340##
##STR00341##
S-1 ##STR00342## 3 --S-- --(CH.sub.2).sub.10CO.sub.2CH.sub.3 S-2
##STR00343## 3 --S-- --(CH.sub.2).sub.10CO.sub.2C.sub.8H.sub.17 S-3
##STR00344## 3 --S-- --(CH.sub.2).sub.10CO.sub.2C.sub.12H.sub.25
S-4 ##STR00345## 3 --S--
--(CH.sub.2).sub.10CO.sub.2CH.sub.2CH.sub.2C.sub.8F.sub.17 S-5
##STR00346## 3 --S-- ##STR00347## S-6 ##STR00348## 3 --S--
--(CH.sub.2).sub.4CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
S-7 ##STR00349## 3 --S--
--(CH.sub.2).sub.7CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
S-8 ##STR00350## 3 --S--
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.2C.sub.6H.sub.13
S-9 ##STR00351## 3 --S--
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.3CH.sub.3 S-10
##STR00352## 3 --S--
--(CH.sub.2).sub.10CO.sub.2--(CH.sub.2CH.sub.2O).sub.4C.sub.12H.sub.25
S-21 ##STR00353## 3 --S-- ##STR00354## S-22 ##STR00355## 3 --S--
##STR00356## S-23 ##STR00357## 3 --S-- ##STR00358## S-24
##STR00359## 3 --S-- ##STR00360## S-25 ##STR00361## 3 --S--
##STR00362## S-26 ##STR00363## 3 --S-- ##STR00364## S-27
##STR00365## 3 --S-- ##STR00366## S-28 ##STR00367## 3 --S--
##STR00368## S-29 ##STR00369## 3 --S-- ##STR00370## S-30
##STR00371## 3 --S-- ##STR00372## S-31 ##STR00373## 3 --S--
##STR00374## S-32 ##STR00375## 3 --S-- ##STR00376## S-33
##STR00377## 3 --S-- ##STR00378## S-34 ##STR00379## 3 --S--
##STR00380## S-35 ##STR00381## 3 --S-- ##STR00382##
##STR00383## ##STR00384## ##STR00385## ##STR00386##
##STR00387##
[0086] The compounds represented by the formula (1) can be
synthesized by using cyanuric chloride, which is readily
commercially available, as a starting material.
[0087] The impregnating oil composition of the invention preferably
comprises at least one compound represented by the formula (1) in
an amount of 0.1 to 10 wt %, more preferably in an amount of 1 to
10 wt % and much more preferably in an mount of 1 to 5 wt %. The
composition containing the compound in an amount falling within the
above range is preferred in the view of improvement in ability of
forming oil films and durability enhancement.
[0088] The impregnating oil composition of the invention comprises
a base oil. Any types of base oil may be employed in the invention,
and it may be selected from either mineral oils or synthetic oils.
In the view of reduction of sludge, the base oils is preferably
selected from synthetic oils and more preferably from synthetic
carbon hydrate base oils. The composition, comprising, as base oil,
at least one selected from the group consisting of
poly-alpha-olefins, poly-alpha-olefin hydrates,
ethylene-alpha-olefin copolymers, ethylene-alpha-olefin copolymer
hydrates, mixtures of poly-alpha-olefin or hydrate thereof and
alkyl naphthalene, mixtures of ethylene-alpha-olefin copolymer or
hydrate thereof and alkyl naphthalene is preferred in the view of
compatibility with the compound represented by the formula (1),
reduction of sludge and durability enhancement.
[0089] Various types of poly alpha-olefin hydrates, referred to as
"PAO" hereinafter, can be employed as base oil in the invention. In
usual, PAO having a mean molecular weight of 200 to 1600 is
preferred and PAO having a mean molecular weight of 400 to 800 is
more preferred. Such PAO can be produced by hydrogenating the
polymers which are produced by carrying out polymerization of
1-decene, isobutene or the like in the presence of catalyst such as
Lewis acid complex and aluminum oxide catalyst. It is possible to
improve durability of the composition and remarkably reduce the
amount of sludge generated from the composition by employing such
PAO as base oil.
[0090] Various types of ethylene-alpha-olefin copolymers, referred
to as "PEAO" hereinafter, can be employed as base oil in the
invention. PEAO may be produced by hydrogenating the polymers which
are produced by carrying out polymerization of ethylene and
alpha-olefin such as 1-decene and isobutene in the presence of
catalyst such as Lewis acid catalyst. In usual, PEAO having a mean
molecular weight of 200 to 4000 is preferred and PEAO having a mean
molecular weight of 1000 to 2000 is more preferred.
[0091] The alkyl naphthalene, which can be employed in the
invention, is selected from any naphthalene derivatives having one
or more substituents on the naphthalene ring. Mono- di- or
tri-alkyl naphthalenes, in which the total carbon atom number of
the alkyl group(s) is from 5 to 25 around carbon, are preferred;
and, among these, naphthalenes having both of lower or higher alkyl
groups are more preferred. Examples of the lower alkyl group
include methyl, ethyl, propyl and isopropyl, and methyl is
preferred. The higher alkyl group is not to be limited to a certain
group, and is may be selected from linear and branched chain alkyl
groups. In the view from viscosity index and lubricant property,
the higher alkyl group is preferably a linear chain alkyl group.
Examples of such alkyl naphthalene include dialkyl naphthalenes
having a methyl and a secondary C.sub.10-24 alkyl group and
mixtures thereof which are described in JPA No. hei 8-302371. Known
materials, especially commercially available materials, are
preferred in the view of procurement easiness.
[0092] As base oil to be employed in the invention, mixtures of PAO
or PEAO and alkyl naphthalene are preferred. As to the mix
proportion thereof, the proportion of the former is preferably from
0.1 to 50 wt % and more preferably from 2 to 40 wt %; and the
proportion of the later is preferably from 50 to 99.9 wt % and more
preferably from 60 to 98 wt %. The composition comprising, as base
oil, the mixture of PAO or PEAO and alkyl naphthalene, having a mix
proportion falling within the preferred range, may exhibit improved
durability and improved ability of forming oil films.
[0093] The composition of the invention may comprise any known
additives in order to attain practical performances adopted for the
individual applications. Examples of the additive include wear
preventive agents, extreme pressure agents, antioxidants, viscosity
index raising agents, clean dispersion aids, metal passivation
agents, corrosion preventive agents, rust preventive agents, and
defoaming agents in an amount without lowering the effect of the
invention.
[0094] The impregnating oil composition of the invention, with
which a sintered body is impregnated, is employed in a bearing
apparatus. The composition, for example, may be kept within pores
of a porous sintered body. The sintered body impregnated with the
composition of the invention may be employed in a part of a sliding
part or as a sliding part of a bearing apparatus. The composition
is fed from the oil-impregnated sintered bearing to a sliding site
between a rotating element and a non-rotation body for bearing the
rotating element, and contributes to reducing friction and wear. It
can be thought that since the composition of the invention
comprises a base oil and a particular class of discotic compound,
employing the composition of the invention can achieve lower
friction and, therefore, higher wear-resistance, compared with
employing known compositions, comprising base oil and a metal
compound such as molybdenum compound and zinc compound, or known
compositions comprising base oil and ester phosphate.
[0095] The invention also relates to a bearing apparatus for
bearing a rotating element rotatably comprising a sliding part
wherein at least a part of the sliding part is a sintered body
impregnated with the composition of the invention; and a sliding
member comprising a sintered body impregnated with the composition
of the invention. The porous sintered body is preferable, and
employing the porous sintered body, the impregnating oil
composition is kept within the pores of the porous sintered body.
The sintered body made of any material can be employed in the
invention, and, in usual, metal sintered bodies are employed. Metal
sintered bodies may be produced by sintering metal powders,
comprising, as a major material, one or more types of metal powders
selected from the common metal powders such as copper, iron and
aluminum powder, and, if necessary, one or more types of powders
selected from tin, lead, graphite and their alloy metal powders. It
is possible to provide a long-life and stably operable bearing
apparatus by employing the sintered bearing of the invention for a
sliding part.
[0096] The bearing apparatus of the invention can be employed as a
small size motor in the various technical fields such as
automobiles, audio equipments, office equipments, home electric
equipments and agricultural machines.
EXAMPLES
[0097] The invention will be further specifically described below
with reference to the following Examples. Materials, reagents,
amounts and proportions thereof, operations, and the like as shown
in the following Examples can be properly changed so far as the
gist of the invention is not deviated. Accordingly, it should not
be construed that the scope of the invention is limited to the
following specific examples.
[0098] In the examples described below, each friction coefficient
was measured by using a reciprocating type friction test machine
(SRV friction wear test machine) under conditions described below.
And each wear resistance was evaluated with wear depths measured by
using a surface roughness measuring equipment.
[0099] Seven types of impregnating oil compositions, Example Nos. 1
to 7, were prepared by using the exemplified compounds N-8, N-28
N-34 and S-34 respectively. And Comparative Example Nos. 1 to 4
were prepared by using only base oils.
[Test Condition]
[0100] Tests were subjected under Cylinder on Plate Test.
[0101] Specimen (friction material): SUJ-2
[0102] Plate: 24 mm in diameter, 6.9 mm thick
[0103] Three plates, having thereon a sintered metal layer shown
below respectively, were produced and the plates were impregnated
with the compositions shown in Table 1 respectively. [0104]
Impregnated iron sintered layer, employed in Example Nos. 1, 4 to 7
and Comparative Example Nos. 1 to 4, was produced as follows:
[0105] Iron powder mixed with copper powder in an amount of 3
weight % and chemical carbon in an amount of 0.6 weight %, was
disposed on a cast iron substrate, subjected to compression
formation under 250 MPa, and sintered in a reduction atmosphere at
770.degree. C. for an hour. [0106] Impregnated copper sintered
layer, employed in Example No. 2, was produced as follows: [0107]
Copper powder mixed with tin powder in an amount of 88 weight % and
graphite in an amount of 2 weight %, was disposed on a cast iron
substrate, subjected to compression formation under 250 MPa, and
sintered in a reduction atmosphere at 770.degree. C. for an hour.
[0108] Impregnated TiO.sub.2 sintered layer, employed in Example
No. 3 produced as follows: [0109] Ti(OC.sub.8H.sub.17-n).sub.4 in
an amount of 33 wt % added with TiO.sub.2 fine powder in an amount
of 57 wt % and PEO (MW3000) was disposed on a cast iron substrate,
and sintered under UV irradiation at 560.degree. C. for three
hours.
[0110] Cylinder: 15 mm in diameter, 22 mm long
[0111] Temperature: 50.degree. C. or 80.degree. C.
[0112] Load: 50N or 100N
[0113] Amplitude: 1.5 mm
[0114] Frequency: 50 Hz
[0115] Testing period: for 5 min. after the start of testing
[0116] The results of Example Nos. 1 to 6 are shown in Table 1 and
the results of Example No. 7 and Comparative Example Nos. 1 to 4
are shown in Table 2. From the results shown in Table Nos. 1 and 2,
it is understandable that Example Nos. 1 to 7 exhibited an
excellent low-wear property respectively, compared with Comparative
Example Nos. 1 to 4. It is also understandable that Example Nos. 1
to 6, containing synthetic hydrocarbon as base oil, exhibited an
excellent low-wear property, compared with Example No. 7 containing
mineral oil as base oil.
TABLE-US-00002 TABLE 1 Example 1 Example 2 Example 3 Example 4
Example 5 Example 6 Discotic Compound wt % N-8 N-28 N-34 S-34 B-5
B-10 5 5 5 5 5 5 Base Oil wt % alkyl naphthalene 87 87 87 87 87 87
poly-.alpha.-olefin hydrate 5 5 -- -- 5 -- ethylene-.alpha.-olefin
-- -- 5 5 -- 5 copolymer hydrate Additive wt % polymethacrylate 1 1
1 1 1 1 dioctyl 0.5 0.5 0.5 0.5 0.5 0.5 diphenylamine barium
dinonyl 0.5 0.5 0.5 0.5 0.5 0.5 naphthalene sulfate amine phosphate
0.5 0.5 0.5 0.5 0.5 0.5 benzotriazole 0.5 0.5 0.5 0.5 0.5 0.5
derivative SRV friction wear 0.07 0.07 0.07 0.08 0.07 0.07 test at
50N, 50.degree. C. SRV friction wear 0 0 0 0 0 0 test at 100N,
80.degree. C.
TABLE-US-00003 TABLE 2 Comparative Comparative Comparative
Comparative Example 1 Example 2 Example 3 Example 4 Example 7
Discotic Compound wt % -- -- -- -- N-8 -- -- -- -- 5 Base Oil wt %
alkyl naphthalene 100 -- -- 97 -- poly-.alpha.-olefin hydrate --
100 -- -- -- ethylene-.alpha.-olefin -- -- 100 -- -- copolymer
hydrate commercially- -- -- -- -- 95 available mineral oil Additive
wt % polymethacrylate -- -- -- 1 1 dioctyl -- -- -- 0.5 0.5
diphenylamine barium dinonyl -- -- -- 0.5 0.5 naphthalene sulfate
amine phosphate -- -- -- 0.5 0.5 benzotriazole -- -- -- 0.5 0.5
derivative SRV friction wear 0.2 0.22 0.24 0.2 0.1 test at 50N,
50.degree. C. SRV friction wear 0.9 1.1 1.2 1 0.02 test at 100N,
80.degree. C.
INDUSTRIAL APPLICABILITY
[0117] According to the present invention, it is possible to
provide an impregnating oil composition for a sintered bearing
capable of improving film-forming ability of the bearing and of
extending bearing life. It is also possible to provide a long-life
bearing apparatus reduced in wearing at a sliding part and capable
of working stably. It is also possible to provide a sliding member
which is useful for such a bearing apparatus.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0118] This application claims benefit of priority under 35 USC to
Japanese Patent Application No. 2005-246318 filed Aug. 26,
2005.
* * * * *