U.S. patent application number 17/050515 was filed with the patent office on 2021-08-05 for polymeric composition containing a light stabilizer.
The applicant listed for this patent is Dow Global Technologies LLC, Rohm and Haas Company. Invention is credited to Bharat I. Chaudhary, Peter C. Dreux, Xindi Yu, Yichi Zhang.
Application Number | 20210238438 17/050515 |
Document ID | / |
Family ID | 1000005582353 |
Filed Date | 2021-08-05 |
United States Patent
Application |
20210238438 |
Kind Code |
A1 |
Chaudhary; Bharat I. ; et
al. |
August 5, 2021 |
POLYMERIC COMPOSITION CONTAINING A LIGHT STABILIZER
Abstract
The present disclosure provides a composition. The composition
includes a silane functionalized polyolefin; and a hindered amine
light stabilizer (HALS) having a Mw greater than 5,000 Dalton. The
present disclosure also provides a coated conductor. The coated
conductor includes a conductor and a coating on the conductor, the
coating including a composition. The coating composition includes a
silane functionalized polyolefin; and a hindered amine light
stabilizer (HALS) having a Mw greater than 5,000 Dalton.
Inventors: |
Chaudhary; Bharat I.;
(Princeton, NJ) ; Yu; Xindi; (Phoenixville,
PA) ; Zhang; Yichi; (Novi, MI) ; Dreux; Peter
C.; (Lumberton, NJ) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Dow Global Technologies LLC
Rohm and Haas Company |
Midland
Collegeville |
MI
PA |
US
US |
|
|
Family ID: |
1000005582353 |
Appl. No.: |
17/050515 |
Filed: |
April 26, 2019 |
PCT Filed: |
April 26, 2019 |
PCT NO: |
PCT/US2019/029361 |
371 Date: |
October 26, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
62663499 |
Apr 27, 2018 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C09D 123/0892 20130101;
H01B 3/441 20130101; C08F 210/02 20130101; C08K 5/34926 20130101;
C08K 2201/019 20130101 |
International
Class: |
C09D 123/08 20060101
C09D123/08; C08K 5/3492 20060101 C08K005/3492; C08F 210/02 20060101
C08F210/02; H01B 3/44 20060101 H01B003/44 |
Claims
1. A composition comprising: a silane functionalized polyolefin;
and a hindered amine light stabilizer (HALS) having a weight
average molecular weight, Mw, greater than 5,000 Dalton
(g/mol).
2. The composition of claim 1, wherein the composition comprises a
UV absorber that is different than the HALS.
3. The composition of claim 1, wherein the composition yields a wet
insulation resistance (IR) ratio from 0.4 to 20.0.
4. The composition of claim 1, wherein the HALS has a Mw from
greater than 5,000 Dalton to 50,000 Dalton.
5. The composition of claim 1, wherein the HALS has a Structure
(H): ##STR00008## wherein m is an integer from 3 to 20.
6. The composition of claim 1, wherein the silane functionalized
polyolefin is selected from the group consisting of a
silane-grafted ethylene-based polymer and an ethylene/silane
copolymer.
7. The composition of claim 1, wherein the composition is void of
flame retardant.
8. The composition of claim 1 comprising: from 20 wt % to 99.5 wt %
of the silane functionalized polyolefin selected from the group
consisting of a silane-grafted ethylene-based polymer and an
ethylene/silane copolymer; from 0.1 wt % to 0.5 wt % of the HALS,
based on the total weight of the composition; and from 0.01 wt % to
3.0 wt % UV absorber that is different than the HALS, based on the
total weight of the composition.
9. The composition of claim 1 wherein the composition is
halogen-free.
10. A coated conductor comprising: a conductor; and a coating on
the conductor, the coating comprising the composition of claim
1.
11. (canceled)
12. (canceled)
13. (canceled)
14. (canceled)
15. (canceled)
16. (canceled)
17. (canceled)
Description
FIELD
[0001] The present disclosure relates to moisture curable
compositions. In one aspect, the disclosure relates to moisture
curable compositions with suitable wet electrical insulation
resistance and/or suitable retained dielectric strength after
glancing impact and/or suitable long term UV resistance, while in
another aspect, the disclosure relates to insulation or jacket
layers for wires and cables comprising a moisture curable
composition and coated conductors including the same.
BACKGROUND
[0002] Moisture-curable compositions containing a
silane-functionalized polyolefin (e.g., a silane-grafted
polyolefin) are frequently used to form coatings, and particularly
insulation or jacket layers, for wires and cables. To improve the
ultraviolet (UV) light stabilization of the compositions, a light
stabilizer or combination of stabilizers is added (such as hindered
amine light stabilizers). Often, the compositions contain flame
retardants, which can be halogen-free or halogenated. However,
coated conductors with coating compositions containing conventional
hindered amine light stabilizers and halogen-free flame retardants
exhibit unacceptably low wet electrical insulation resistance over
prolonged periods of time at elevated temperatures. Furthermore,
conventional coated conductors with coating compositions containing
conventional hindered amine light stabilizers and flame retardants
can exhibit inferior or unacceptably low retained dielectric
strength after glancing impact. Moreover, conventional coated
conductors with coating compositions containing conventional
hindered amine light stabilizers and flame retardants can exhibit
inferior or unacceptably low long-term UV resistance due to
migration of the conventional hindered amine light stabilizer.
[0003] The art recognizes the need for a coating composition
containing a light stabilizer that exhibits suitable long-term UV
resistance for wire and cable applications. The art further
recognizes the need for a halogen-free moisture curable coating
composition containing a light stabilizer that is void of flame
retardant and exhibits suitable long-term UV resistance for wire
and cable applications.
[0004] The art recognizes the need for a coating composition
containing a light stabilizer that exhibits wet electrical
insulation resistance suitable for wire and cable applications. The
art further recognizes the need for a halogen-free moisture curable
coating composition containing a light stabilizer that is void of
flame retardant and exhibits wet electrical insulation resistance
suitable for wire and cable applications.
SUMMARY
[0005] The present disclosure provides a composition that is
suitable for wire and cable applications. The composition includes
a silane functionalized polyolefin; and a hindered amine light
stabilizer (HALS) having a weight average molecular weight, Mw,
greater than 5,000 Dalton (g/mol).
[0006] The present disclosure also provides a composition, and
further a halogen-free composition, that is suitable for wire and
cable applications. The composition includes a silane
functionalized polyolefin; and a HALS having a weight average
molecular weight, Mw, greater than 5,000 Dalton.
[0007] The present composition provides a coated conductor. The
coated conductor includes a conductor and a coating on the
conductor, the coating including a composition. The composition
includes a silane functionalized polyolefin; and a HALS having a
weight average molecular weight, Mw, greater than 5,000 Dalton.
[0008] The present composition also provides a coated conductor,
and further a halogen-free coated conductor. The coated conductor
includes a conductor and a coating on the conductor, the coating
including a composition. The composition includes a silane
functionalized polyolefin; and a HALS having a weight average
molecular weight, Mw, greater than 5,000 Dalton.
Definitions
[0009] Any reference to the Periodic Table of Elements is that as
published by CRC Press, Inc., 1990-1991. Reference to a group of
elements in this table is by the new notation for numbering
groups.
[0010] For purposes of United States patent practice, the contents
of any referenced patent, patent application or publication are
incorporated by reference in their entirety (or its equivalent US
version is so incorporated by reference) especially with respect to
the disclosure of definitions (to the extent not inconsistent with
any definitions specifically provided in this disclosure) and
general knowledge in the art.
[0011] The numerical ranges disclosed herein include all values
from, and including, the lower and upper value. For ranges
containing explicit values (e.g., a range from 1, or 2, or 3 to 5,
or 6, or 7), any subrange between any two explicit values is
included (e.g., the range 1-7 above includes subranges 1 to 2; 2 to
6; 5 to 7; 3 to 7; 5 to 6; etc.).
[0012] Unless stated to the contrary, implicit from the context, or
customary in the art, all parts and percents are based on weight
and all test methods are current as of the filing date of this
disclosure.
[0013] "Alkoxy" (or "alkoxy group") refers to the --OZ radical,
where representative Z include alkyl, substituted alkyl,
cycloalkyl, substituted cycloalkyl, heterocycloalkyl, substituted
heterocycloalkyl, silyl groups and combinations thereof.
Nonlimiting examples of suitable alkoxy radicals include methoxy,
ethoxy, benzyloxy, and t-butoxy.
[0014] "Alkyl" and "alkyl group" refer to a saturated linear,
cyclic, or branched hydrocarbon group.
[0015] "Alkenyl" or "alkenyl group" refer to a hydrocarbyl group
containing at least one C.dbd.C double bond. Alkenyl groups may be
linear, cyclic or branched. Nonlimiting examples of suitable
alkenyl groups include ethenyl groups, n-propenyl groups,
i-propenyl groups, n-butenyl groups, t-butenyl groups, i-butenyl
groups, etc.
[0016] "Aralkyl" and "aralkyl group" refer to an organic radical
derived from aromatic hydrocarbon by replacing one or more hydrogen
atoms with an aryl group.
[0017] "Aryl" and "aryl group" refer to an organic radical derived
from aromatic hydrocarbon by deleting one hydrogen atom therefrom.
An aryl group may be a monocyclic and/or fused ring system, each
ring of which suitably contains from 5 to 7, preferably from 5 or 6
atoms. Structures wherein two or more aryl groups are combined
through single bond(s) are also included. Specific examples
include, but are not limited to, phenyl, tolyl, naphthyl, biphenyl,
anthryl, indenyl, fluorenyl, benzofluorenyl, phenanthryl,
triphenylenyl, pyrenyl, perylenyl, chrysenyl, naphtacenyl,
fluoranthenyl and the like.
[0018] "Alpha-olefin," ".alpha.-olefin" and like terms refer to a
hydrocarbon molecule or a substituted hydrocarbon molecule (i.e., a
hydrocarbon molecule comprising one or more atoms other than
hydrogen and carbon, e.g., halogen, oxygen, nitrogen, etc.), the
hydrocarbon molecule comprising (i) only one ethylenic
unsaturation, this unsaturation located between the first and
second carbon atoms, and (ii) at least 2 carbon atoms, or 3 to 20
carbon atoms, or 4 to 10 carbon atoms, or 4 to 8 carbon atoms.
Nonlimiting examples of .alpha.-olefins include ethylene,
propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-dodecene, and
mixtures of two or more of these monomers.
[0019] "Blend," "polymer blend" and like terms refer to a
composition of two or more polymers. Such a blend mayor may not be
miscible. Such a blend mayor may not be phase separated. Such a
blend may or may not contain one or more domain configurations, as
determined from transmission electron spectroscopy, light
scattering, x-ray scattering, and any other method used to measure
and/or identify domain configurations.
[0020] A "cable" is at least one conductor, e.g., wire, optical
fiber, etc., within a protective insulation, jacket, sheath. A
cable may be two or more wires or two or more optical fibers bound
together in a common protective jacket or sheath. Combination
cables may contain both electrical wires and optical fibers. The
individual wires or fibers inside the jacket or sheath may be bare,
covered or insulated. Typical cable designs are illustrated in U.S.
Pat. Nos. 5,246,783; 6,496,629; and 6,714,707. The cable can be
designed for low, medium, and/or high voltage applications.
[0021] "Carboxylate" refers to a salt or ester of carboxylic acid.
"Carboxylic acid" is an organic acid containing a carboxyl group
(--COOH).
[0022] The term "composition" refers to a mixture of materials
which comprise the composition, as well as reaction products and
decomposition products formed from the materials of the
composition.
[0023] The terms "comprising," "including," "having," and their
derivatives, are not intended to exclude the presence of any
additional component, step or procedure, whether or not the same is
specifically disclosed. In order to avoid any doubt, all
compositions claimed through use of the term "comprising" may
include any additional additive, adjuvant, or compound, whether
polymeric or otherwise, unless stated to the contrary. In contrast,
the term "consisting essentially of" excludes from the scope of any
succeeding recitation any other component, step, or procedure,
excepting those that are not essential to operability. The term
"consisting of" excludes any component, step, or procedure not
specifically delineated or listed. The term "or," unless stated
otherwise, refers to the listed members individually as well as in
any combination. Use of the singular includes use of the plural and
vice versa.
[0024] A "conductor" is one or more wire(s), or one or more
fiber(s), for conducting heat, light, and/or electricity at any
voltage (DC, AC, or transient). The conductor may be a
single-wire/fiber or a multi-wire/fiber and may be in strand form
or in tubular form. Non-limiting examples of suitable conductors
include carbon and various metals, such as silver, gold, copper,
and aluminum. The conductor may also be optical fiber made from
either glass or plastic. The conductor may or may not be disposed
in a protective sheath. The conductor may be a single cable or a
plurality of cables bound together (i.e., a cable core, or a
core).
[0025] "Crosslinkable" and "curable" indicate that the polymer,
before or after shaped into an article, is not cured or crosslinked
and has not been subjected or exposed to treatment that has induced
substantial crosslinking although the polymer comprises additive(s)
or functionality that will effectuate substantial crosslinking upon
subjection or exposure to such treatment (e.g., exposure to
water).
[0026] "Crosslinked" and similar terms indicate that the polymer
composition, before or after it is shaped into an article, has
xylene or decalin extractables of less than or equal to 90 weight
percent (i.e., greater than or equal to 10 weight percent gel
content).
[0027] "Cured" and similar terms indicate that the polymer, before
or after it is shaped into an article, was subjected or exposed to
a treatment which induced crosslinking.
[0028] An "ethylene-based polymer," "ethylene polymer," or
"polyethylene" is a polymer that contains equal to or greater than
50 wt %, or a majority amount of polymerized ethylene based on the
weight of the polymer, and, optionally, may comprise one or more
comonomers. The generic term "ethylene-based polymer" thus includes
ethylene homopolymer and ethylene interpolymer. A suitable
comonomer is an alpha-olefin. "Ethylene-based polymer" and the term
"polyethylene" are used interchangeably. Nonlimiting examples of
ethylene-based polymer (polyethylene) include low density
polyethylene (LDPE) and linear polyethylene. Nonlimiting examples
of linear polyethylene include linear low density polyethylene
(LLDPE), ultra low density polyethylene (ULDPE), very low density
polyethylene (VLDPE), multi-component ethylene-based copolymer
(EPE), ethylene/.alpha.-olefin multi-block copolymers (also known
as olefin block copolymer (OBC)), single-site catalyzed linear low
density polyethylene (m-LLDPE), substantially linear, or linear,
plastomers/elastomers, medium density polyethylene (MDPE), and high
density polyethylene (HDPE). Generally, polyethylene may be
produced in gas-phase, fluidized bed reactors, liquid phase slurry
process reactors, or liquid phase solution process reactors, using
a heterogeneous catalyst system, such as Ziegler-Natta catalyst, a
homogeneous catalyst system, comprising Group 4 transition metals
and ligand structures such as metallocene, non-metallocene
metal-centered, heteroaryl, heterovalent aryloxyether,
phosphinimine, and others. Combinations of heterogeneous and/or
homogeneous catalysts also may be used in either single reactor or
dual reactor configurations. Polyethylene may also be produced in a
high pressure reactor without a catalyst.
[0029] An "ethylene/.alpha.-olefin polymer" is an polymer that
contains a majority amount of polymerized ethylene, based on the
weight of the polymer, and one or more .alpha.-olefin
comonomers.
[0030] "Functional group" and like terms refer to a moiety or group
of atoms responsible forgiving a particular compound its
characteristic reactions. Nonlimiting examples of functional groups
include heteroatom-containing moieties, oxygen-containing moieties
(e.g., hydrolysable silane, alcohol, aldehyde, ester, ether,
ketone, and peroxide groups), and nitrogen-containing moieties
(e.g., amide, amine, azo, imide, imine, nitrate, nitrile, and
nitrite groups).
[0031] A "halogen" is an element in IUPAC Group 17 of the Periodic
Table of Elements, which includes fluorine (F), chlorine (Cl),
bromine (Br), iodine (I), and astatine (At).
[0032] "Halogen-free" refers to a flame retardant, a composition,
or a coated conductor that substantially excludes halogen, or
excludes halogen. A flame retardant, composition, or coated
conductor that substantially excludes halogen contains from 0
mg/kg, or greater than 0 mg/kg to less than 2,000 mg/kg halogen,
based on the total weight of flame retardant, composition, or
coated conductor, as measured by ion chromatography (IC), or a
similar analytical method.
[0033] A "heteroatom" is an atom other than carbon or hydrogen. The
heteroatom can be a non-carbon atom from Groups IV, V, VI and VII
of the Periodic Table. Nonlimiting examples of heteroatoms include:
F, N, O, P, B, S, and Si.
[0034] The terms "hydrocarbyl" and "hydrocarbon" refer to
substituents containing only hydrogen and carbon atoms, including
branched or unbranched, saturated or unsaturated, cyclic,
polycyclic or noncyclic species. Nonlimiting examples include
alkyl-, cycloalkyl-, alkenyl-, alkadienyl-, cycloalkenyl-,
cycloalkadienyl-, aryl-, and alkynyl-groups.
[0035] A "hydrolysable silane group" is a silane group that will
react with water. These include alkoxysilane groups on monomers or
polymers that can hydrolyze to yield silanol groups, which in turn
can condense to crosslink the monomers or polymers.
[0036] A "jacket" is an outermost coating on the conductor. When
the conductor includes a single coating, the coating may serve as
both a jacket and an insulation on the conductor.
[0037] "Low density polyethylene" (or "LDPE") is an ethylene
homopolymer, or an ethylene/.alpha.-olefin copolymer comprising at
least one C.sub.3-C.sub.10 .alpha.-olefin, or a
C.sub.3-C.sub.4.alpha.-olefin, that has a density from 0.915 g/cc
to 0.925 g/cc and contains long chain branching with broad MWD.
LDPE is typically produced by way of high pressure free radical
polymerization (tubular reactor or autoclave with free radical
initiator). Nonlimiting examples of LDPE include MarFlex.TM.
(Chevron Phillips), LUPOLEN.TM. (LyondellBasell), as well as LDPE
products from Borealis, Ineos, ExxonMobil, and others.
[0038] "Metals" includes all elements listed as metals in the
Periodic Table of Elements, including Li, Be, Na, Mg, Al, K, Ca,
Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Rb, Sr, Y, Zr, Nb, Mo,
Tc, Ru, Rh, Pd, Ag, Cd, In, Sn, Cs, Ba, La, Hf, Ta, W, Re, Ir, Pt,
Au, Hg, Tl, Pb, Bi, Po, Fr, Ra, and Ac, and the lanthanides and
actinides.
[0039] "Moisture curable" and "moisture crosslinkable" indicate
that the composition will cure, i.e., crosslink, upon exposure to
water. Moisture cure can be with or without the assistance of a
crosslinking catalyst (e.g., a silanol condensation catalyst),
promoter, etc.
[0040] An "olefin-based polymer" or "polyolefin" is a polymer that
contains equal to or greater than 50 wt %, or a majority amount of
polymerized olefin monomer (based on the weight of the polymer),
and optionally, may contain at least one comonomer. Nonlimiting
examples of .alpha.-olefin monomer include C.sub.2, or C.sub.3 to
C.sub.4, or C.sub.6, or C.sub.8, or C.sub.10, or C.sub.12, or
C.sub.16, or C.sub.18, or C.sub.20 .alpha.-olefins, such as
ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, and
1-octene. Nonlimiting examples of an olefin-based polymer include
an ethylene-based polymer and a propylene-based polymer.
[0041] A "polymer" is a polymeric compound prepared by polymerizing
monomers, whether of the same or a different type. The generic term
polymer thus embraces the term "homopolymer" (employed to refer to
polymers prepared from only one type of monomer, with the
understanding that trace amounts of impurities can be incorporated
into the polymer structure), and the term "interpolymer," which
includes copolymers (employed to refer to polymers prepared from
two different types of monomers), terpolymers (employed to refer to
polymers prepared from three different types of monomers), and
polymers prepared from more than three different types of monomers.
Trace amounts of impurities, for example, catalyst residues, may be
incorporated into and/or within the polymer. It also embraces all
forms of copolymer, e.g., random, block, etc. The terms
"ethylene/.alpha.-olefin polymer" and "propylene/.alpha.-olefin
polymer" are indicative of copolymer as described above prepared
from polymerizing ethylene or propylene respectively and one or
more additional, polymerizable .alpha.-olefin comonomers. It is
noted that although a polymer is often referred to as being "made
of" one or more specified monomers, "based on" a specified monomer
or monomer type, "containing" a specified monomer content, or the
like, in this context the term "monomer" is understood to be
referring to the polymerized remnant of the specified monomer and
not to the unpolymerized species. In general, polymers herein are
referred to has being based on "units" that are the polymerized
form of a corresponding monomer.
[0042] A "propylene-based polymer," "propylene polymer," or
"polypropylene" is a polymer that contains equal to or greater than
50 wt %, or a majority amount of polymerized propylene based on the
weight of the polymer, and, optionally, may comprise one or more
comonomers. The generic term "propylene-based polymer" thus
includes propylene homopolymer and propylene interpolymer.
[0043] A "sheath" is a generic term and when used in relation to
cables, it includes insulation coverings or layers, protective
jackets and the like.
[0044] A "wire" is a single strand of conductive metal, e.g.,
copper or aluminum, or a single strand of optical fiber.
Test Methods
[0045] Crush resistance is measured in accordance with Section 620
of UL-1581, or Section 7.11 of UL2556 (condition: 14 AWG (American
Wire Gauge)). The result is recorded in pounds-force (lb-f). The
average of ten measurements is reported. The reported crush
resistance values are the ultimate values, not those from an
initial peak (if any exists).
[0046] Density is measured in accordance with ASTM D792, Method B.
The result is recorded in grams (g) per cubic centimeter (g/cc or
g/cm.sup.3).
[0047] Hot creep is measured in accordance with UL-2556 Section 7.9
for conductor sizes of 8 AWG or smaller. Tests are conducted on
insulation and/or jacket layers that have been removed (stripped)
from conductors. Two marks spaced 25 mm apart are marked on a
sample. The sample is then placed into an oven at 150.degree. C.
under a load of 20 N/cm.sup.2 (0.2 MPa) for 15 minutes. The
distance between the initial marks is re-measured and the hot creep
elongation is recorded (as a percentage).
[0048] Melt index (MI) (also known as I.sub.2) is measured in
accordance with ASTM D1238, Condition 190.degree. C./2.16 kilogram
(kg) weight and is reported in grams eluted per 10 minutes (g/10
min).
[0049] Melting Point (Tm) is measured by the Differential Scanning
Calorimetry (DSC) technique for measuring the melting peaks of
polyolefins as described in U.S. Pat. No. 5,783,638. The melting
point is reported in degrees Celsius (.degree. C.).
[0050] Retained dielectric strength (also known as AC breakdown, or
ACBD) after glancing impact is determined on 14 AWG copper wire
with an insulation layer, in accordance with UL 2556 Section 7.14,
Edition Number: 4, Edition Date: Dec. 15, 2015. ACBD is measured
before and after impact. The ACBD of six specimens before impact
and six specimens (per coated conductor construction) after impact
is measured, and the average values of ACBD are computed before and
after impact (excluding the highest and lowest values measured
after glancing impact). Retained ACBD after glancing impact
(average value) is recorded as a percentage of the average value
before impact.
[0051] Shore A hardness is measured in accordance with ASTM
D2240.
[0052] Shore D hardness is measured in accordance with ASTM
D2240.
[0053] Tensile strength (stress at break) and tensile elongation
(strain at break) are measured in accordance with UL 2556 Section
3.5. Tensile stress at break and tensile elongation at break are
measured with an Instron model 4201. Tests are conducted on
insulation and/or jacket layers that have been removed (stripped)
from conductors. The testing conditions are 20 inches per minute
crosshead speed, 2.5 inch jaw span with a 100 pound load cell.
Tensile stress at break is recorded in pounds per square inch
(psi). Tensile elongation is recorded as a percentage.
[0054] Wet insulation resistance (IR) is measured in accordance
with UL-44. Wet IR is measured on a coiled moisture cured coated
conductor (14 AWG copper wire with nominal 30 mil coating
thickness), of which a 10 ft (3.048 meter) length of wire is
immersed in an electrical water bath at 90.degree. C. The wire is
connected to a megohmmeter in a manner such that the water is one
electrode and the wire conductor is the other electrode. In that
manner, the direct current (DC) electrical resistance of the
coating is measured with 500 V applied. The initial measurement is
taken after 6-24 hours of submersion, and all subsequent
measurements are taken on a 7-day frequency for a period of
typically up to 36 weeks, while the sample is aged under 600 V
alternating current (AC).
[0055] The wet insulation resistance ratio (the wet IR ratio) is
computed by dividing the average wet IR recorded in weeks 7-9 by
the average wet IR recorded in weeks 4-6.
Size Exclusion Chromatography (SEC)
[0056] Weight average molecular weight (Mw), number average
molecular weight (Mn), and Mw/Mn, are determined by conventional
size exclusion chromatography (SEC). The technique uses a
differential reflectometer as concentration sensor and a relative
calibration built with polystyrene (PS) standards with molecular
weight distribution (MWD) narrow.
[0057] Samples are solubilized in the SEC mobile phase at the
desired concentration. A Waters modular chromatographic HPLC/SEC
system is used.
[0058] During sample characterization, the chromatographic system
has the following conditions: [0059] Mobile Phase: THF+0.08 M
diethanolamine [0060] Columns Bench: 2 Mesopore Polymer
Laboratories [0061] Temperature: 30.degree. C. [0062] Flow: 0.6
l/min [0063] Degassing: helium [0064] Concentration: >>10
mg/ml [0065] Injection volume: 50 .mu.L [0066] Test time: 40
minutes [0067] Calibration: polynomial relative of 3 order built
with 8 polystyrene (PS) standards with MWD narrow with peak
molecular weight (Mp) of between 95000 g/mol and 382 g/mol.
DETAILED DESCRIPTION
[0068] The present disclosure provides a composition suitable for
wire and cable applications. The composition includes: a silane
functionalized polyolefin; a hindered amine light stabilizer (HALS)
having a having a weight average molecular weight, Mw, greater than
5,000 Dalton (g/mol); and optionally, an additive.
[0069] In an embodiment, the composition includes: a silane
functionalized polyolefin; a hindered amine light stabilizer (HALS)
having a having a weight average molecular weight, Mw, greater than
5,000 Dalton (g/mol); and optionally, an additive.
[0070] A. Silane Functionalized Polyolefin
[0071] The present composition includes a silane functionalized
polyolefin. A "silane functionalized polyolefin" is a polymer that
contains silane and equal to or greater than 50 wt %, or a majority
amount, of polymerized .alpha.-olefin, based on the total weight of
the polymer. Nonlimiting examples of suitable silane functionalized
polyolefin include .alpha.-olefin/silane copolymer, silane-grafted
polyolefin (Si-g-PO), and combinations thereof.
[0072] An ".alpha.-olefin/silane copolymer" is formed by the
copolymerization of an .alpha.-olefin (such as ethylene) and a
hydrolysable silane monomer (such as a vinyl alkoxysilane monomer).
In an embodiment, the .alpha.-olefin/silane copolymer is an
ethylene/silane copolymer prepared by the copolymerization of
ethylene, a hydrolysable silane monomer and, optionally, an
unsaturated ester. The preparation of ethylene/silane copolymers is
described, for example, in U.S. Pat. Nos. 3,225,018 and 4,574,133,
each incorporated herein by reference.
[0073] A "silane-grafted polyolefin" (or "Si-g-PO") is formed by
grafting a hydrolysable silane monomer (such as a vinyl
alkoxysilane monomer) onto the backbone of a base polyolefin (such
as polyethylene). In an embodiment, grafting takes place in the
presence of a free-radical generator, such as a peroxide. The
hydrolysable silane monomer can be grafted to the backbone of the
base polyolefin (i) prior to incorporating or compounding the
Si-g-PO into a composition used to make a final article, such as a
coated conductor (also known as a SIOPLAS.TM. process), or (ii)
simultaneously with the extrusion of a composition to form a final
article (also known as a MONOSIL.TM. process, in which the Si-g-PO
is formed in situ during melt blending and extrusion). In an
embodiment, the Si-g-PO is formed before the Si-g-PO is compounded
with HALS, and other optional components. In another embodiment,
the Si-g-PO is formed in situ by compounding a polyolefin,
hydrolysable silane monomer, peroxide initiator, and silanol
condensation catalyst along with HALS, and other optional
components.
[0074] The base polyolefin for the Si-g-PO may be an ethylene-based
polymer or a propylene-based polymer. In an embodiment, the base
polyolefin is an ethylene-based polymer, resulting in a
silane-grafted ethylene-based polymer (Si-g-PE). Non-limiting
examples of suitable ethylene-based polymers include ethylene
homopolymers and ethylene-based interpolymers containing one or
more polymerizable comonomers, such as an unsaturated ester and/or
an .alpha.-olefin.
[0075] The hydrolysable silane monomer used to make an
.alpha.-olefin/silane copolymer or a Si-g-PO is a silane-containing
monomer that will effectively copolymerize with an .alpha.-olefin
(e.g., ethylene) to form an .alpha.-olefin/silane copolymer (e.g.,
an ethylene/silane copolymer) or graft to an .alpha.-olefin polymer
(e.g., a polyolefin) to form a Si-g-PO. Exemplary hydrolysable
silane monomers are those having the following Structure (A):
##STR00001##
wherein R is a hydrogen atom or methyl group; x and y are 0 or 1
with the proviso that when x is 1, y is 1; n is an integer from 1
to 12 inclusive, or n is an integer from 1 to 4, and each R
independently is a hydrolysable organic group such as an alkoxy
group having from 1 to 12 carbon atoms (e.g., methoxy, ethoxy,
butoxy), aryloxy group (e.g., phenoxy), araloxy group (e.g.,
benzyloxy), aliphatic acyloxy group having from 1 to 12 carbon
atoms (e.g., formyloxy, acetyloxy, propanoyloxy), amino or
substituted amino groups (alkylamino, arylamino), or a lower alkyl
group having 1 to 6 carbon atoms inclusive, with the proviso that
not more than one of the three R groups is an alkyl.
[0076] Nonlimiting examples of suitable hydrolysable silane
monomers include silanes that have an ethylenically unsaturated
hydrocarbyl group, such as vinyl, allyl, isopropenyl, butenyl,
cyclohexenyl or gamma-(meth)acryloxy allyl group, and a
hydrolysable group, such as, for example, a hydrocarbyloxy,
hydrocarbonyloxy, or hydrocarbylamino group. Examples of
hydrolysable groups include methoxy, ethoxy, formyloxy, acetoxy,
propionyloxy, and alkyl or arylamino groups.
[0077] In an embodiment, the hydrolysable silane monomer is an
unsaturated alkoxysilane such as vinyl trimethoxysilane (VTMS),
vinyl triethoxysilane, vinyl triacetoxy silane,
gamma-(meth)acryloxy, propyl trimethoxy silane, and mixtures of
these silanes.
[0078] Nonlimiting examples of suitable unsaturated esters used to
make an .alpha.-olefin/silane copolymer include alkyl acrylate,
alkyl methacrylate, or vinyl carboxylate. Nonlimiting examples of
suitable alkyl groups include methyl, ethyl, n-propyl, i-propyl,
n-butyl, t-butyl, etc. In an embodiment, the alkyl group has from
1, or 2 to 4, or 8 carbon atoms. Nonlimiting examples of suitable
alkyl acrylates include ethyl acrylate, methyl acrylate, t-butyl
acrylate, n-butyl acrylate, and 2-ethylhexyl acrylate. Nonlimiting
examples of suitable alkyl methacrylates include methyl
methacrylate and n-butyl methacrylate. In an embodiment, the
carboxylate group has from 2 to 5, or 6, or 8 carbon atoms.
Nonlimiting examples of suitable vinyl carboxylates include vinyl
acetate, vinyl propionate, and vinyl butanoate.
[0079] In an embodiment, the silane functionalized polyolefin
contains from 0.1 wt %, or 0.3 wt %, or 0.5 wt %, or 0.8 wt %, or
1.0 wt %, or 1.2 wt %, or 1.5 wt %, or 1.6 wt % to 1.8 wt %, or 2.0
wt %, or 2.3 wt %, or 2.5 wt %, or 3.0 wt %, or 3.5 wt %, or 4.0 wt
%, or 4.5 wt %, or 5.0 wt % silane, based on the total weight of
the silane functionalized polyolefin.
[0080] In an embodiment, the silane functionalized polyolefin has a
density from 0.850 g/cc, or 0.860 g/cc, or 0.875 g/cc, or 0.890
g/cc to 0.900 g/cc, or 0.910 g/cc, or 0.915 g/cc, or 0.920 g/cc, or
0.930 g/cc, or 0.940 g/cc, or 0.950 g/cc or 0.960 g/cc, or 0.965
g/cc.
[0081] In an embodiment, the silane functionalized polyolefin is a
silane functionalized polyethylene. A "silane functionalized
polyethylene" is a polymer that contains silane and equal to or
greater than 50 wt %, or a majority amount, of polymerized
ethylene, based on the total weight of the polymer.
[0082] In an embodiment, the silane functionalized polyethylene
contains (i) from 50 wt %, or 55 wt %, or 60 wt %, or 65 wt %, or
70 wt %, or 80 wt %, or 90 wt %, or 95 wt % to 97 wt %, or 98 wt %,
or 99 wt %, or less than 100 wt % ethylene and (ii) from 0.1 wt %,
or 0.3 wt % or 0.5 wt %, or 0.8 wt %, or 1.0 wt %, or 1.2 wt %, or
1.5 wt %, or 1.6 wt % to 1.8 wt %, or 2.0 wt %, or 2.3 wt %, or 2.5
wt %, or 3.0 wt %, or 3.5 wt %, or 4.0 wt %, or 4.5 wt %, or 5.0 wt
% silane, based on the total weight of the silane functionalized
polyethylene.
[0083] In an embodiment, the silane functionalized polyethylene has
a melt index (MI) from 0.1 g/10 min, or 0.5 g/10 min, or 1.0 g/10
min, or 2 g/10 min, or 3 g/10 min, or 5 g/10 min, or 8 g/10 min, or
10 g/10 min, or 15 g/10 min, or 20 g/10 min, or 25 g/10 min, or 30
g/10 min to 40 g/10 min, or 45 g/10 min, or 50 g/10 min, or 55 g/10
min, or 60 g/10 min, or 70 g/10 min, or 80 g/10 min, or 90 g/10
min.
[0084] In an embodiment, the silane functionalized polyethylene is
an ethylene/silane copolymer. The ethylene/silane copolymer
contains ethylene and the hydrolyzable silane monomer as the only
monomeric units. In another embodiment, the ethylene/silane
copolymer optionally includes a C.sub.3, or C.sub.4 to C.sub.6, or
C.sub.8, or C.sub.10, or C.sub.12, or C.sub.16, or C.sub.18, or
C.sub.20 .alpha.-olefin; an unsaturated ester; and combinations
thereof. In an embodiment, the ethylene/silane copolymer is an
ethylene/unsaturated ester/silane reactor copolymer. Non-limiting
examples of suitable ethylene/silane copolymers include SI-LINK.TM.
DFDA-5451 NT and SI-LINK.TM. AC DFDB-5451 NT, each available from
The Dow Chemical Company.
[0085] The .alpha.-olefin/silane reactor copolymer, and further the
ethylene/silane reactor copolymer may comprise two or more
embodiments disclosed herein.
[0086] In an embodiment, the silane functionalized polyethylene is
a Si-g-PE.
[0087] The base ethylene-based polymer for the Si-g-PE includes
from 50 wt %, or 55 wt %, or 60 wt %, or 65 wt %, or 70 wt %, or 80
wt %, or 90 wt %, or 95 wt % to 97 wt %, or 98 wt %, or 99 wt %, or
100 wt % ethylene, based on the total weight of the base
ethylene-based polymer.
[0088] In an embodiment, the base ethylene-based polymer for the
Si-g-PE has a density from 0.850 g/cc, or 0.860 g/cc, or 0.875
g/cc, or 0.890 g/cc to 0.900 g/cc, or 0.910 g/cc, or 0.915 g/cc, or
0.920 g/cc, or 0.930 g/cc, or 0.940 g/cc, or 0.950 g/cc, or 0.960
g/cc, or 0.965 g/cc.
[0089] In an embodiment, the base ethylene-based polymer for the
Si-g-PE has a melt index (MI) from 0.1 g/10 min, or 0.5 g/10 min,
or 1.0 g/10 min, or 2 g/10 min, or 3 g/10 min, or 5 g/10 min, or 8
g/10 min, or 10 g/10 min, or 15 g/10 min, or 20 g/10 min, or 25
g/10 min, or 30 g/10 min to 40 g/10 min, or 45 g/10 min, or 50 g/10
min, or 55 g/10 min, or 60 g/10 min, or 70 g/10 min, or 80 g/10
min, or 90 g/10 min.
[0090] In an embodiment, the base ethylene-based polymer for the
Si-g-PE is an ethylene/.alpha.-olefin copolymer. The .alpha.-olefin
contains from 3, or 4 to 6, or 8, or 10, or 12, or 16, or 18, or 20
carbon atoms. Non-limiting examples of suitable .alpha.-olefin
include propylene, butene, hexene, and octene. In an embodiment,
the ethylene-based copolymer is an ethylene/octene copolymer. When
the ethylene-based copolymer is an ethylene/.alpha.-olefin
copolymer, the Si-g-PE is a silane-grafted ethylene/.alpha.-olefin
copolymer. Non-limiting examples of suitable
ethylene/.alpha.-olefin copolymers useful as the base
ethylene-based polymer for the Si-g-PE include the ENGAGE.TM. and
INFUSE.TM. resins available from the Dow Chemical Company.
[0091] In an embodiment, the base ethylene-based polymer for the
Si-g-PE is an ethylene plastomer or elastomer. "Ethylene
plastomers/elastomers" are substantially linear, or linear,
ethylene/.alpha.-olefin copolymers containing homogeneous
short-chain branching distribution comprising units derived from
ethylene and units derived from at least one C.sub.3-C.sub.10
.alpha.-olefin comonomer, or at least one C.sub.4-C.sub.8
.alpha.-olefin comonomer, or at least one C.sub.6-C.sub.8
.alpha.-olefin comonomer. Ethylene plastomers/elastomers have a
density from 0.870 g/cc, or 0.880 g/cc, or 0.890 g/cc to 0.900
g/cc, or 0.902 g/cc, or 0.904 g/cc, or 0.909 g/cc, or 0.910 g/cc,
or 0.917 g/cc. Nonlimiting examples of ethylene
plastomers/elastomers include AFFINITY.TM. plastomers and
elastomers (available from The Dow Chemical Company), EXACT.TM.
Plastomers (available from ExxonMobil Chemical), Tafmer.TM.
(available from Mitsui), Nexlene.TM. (available from SK Chemicals
Co.), and Lucene.TM. (available LG Chem Ltd.).
[0092] In an embodiment, the Si-g-PE is a silane-grafted
ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer. The
silane-grafted ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer
consists of the hydrolyzable silane monomer, ethylene, and
C.sub.4-C.sub.8 .alpha.-olefin comonomer. In other words, the
silane-grafted ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer
contains the hydrolyzable silane monomer, ethylene, and
C.sub.4-C.sub.8 .alpha.-olefin comonomer as the only monomeric
units.
[0093] In an embodiment, the Si-g-PE is a silane-grafted
ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer. The
silane-grafted ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer
consists of the hydrolyzable silane monomer, ethylene, and
C.sub.4-C.sub.8 .alpha.-olefin comonomer. The silane-grafted
ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer has one, some, or
all of the following properties: (a) a density from 0.850 g/cc, or
0.860 g/cc, or 0.875 g/cc, or 0.890 g/cc to 0.900 g/cc, or 0.910
g/cc, or 0.915 g/cc, or 0.920 g/cc, or 0.925 g/cc, or 0.930 g/cc,
or 0.935 g/cc; and/or (b) a melt index from 0.1 g/10 min, or 0.5
g/10 min, or 1 g/10 min, or 2 g/10 min, or 5 g/10 min, or 8 g/10
min, or 10 g/10 min, or 15 g/10 min, or 20 g/10 min, or 25 g/10
min, or 30 g/10 min to 40 g/10 min, or 45 g/10 min, or 50 g/10 min,
or 55 g/10 min, or 60 g/10 min, or 65 g/10 min, or 70 g/10 min, or
75 g/10 min, or 80 g/10 min, or 90 g/10 min; and/or (c) a silane
content of from 0.1 wt %, or 0.3 wt %, or 0.5 wt %, or 0.8 wt %, or
1.0 wt %, or 1.2 wt %, or 1.5 wt %, or 1.6 wt % to 1.8 wt %, or 2.0
wt %, or 2.3 wt %, or 2.5 wt %, or 3.0 wt %, or 3.5 wt %, or 4.0 wt
%, or 4.5 wt %, or 5.0 wt %, based on the total weight of the
silane-grafted ethylene/C.sub.4-C.sub.8 .alpha.-olefin
copolymer.
[0094] The Si-g-PE may comprise two or more embodiments disclosed
herein.
[0095] In an embodiment, the composition contains from 20 wt %, or
25 wt %, or 30 wt %, or 35 wt %, or 40 wt %, or 45 wt %, or 50 wt
%, or 55 wt %, or 60 wt %, or 65 wt %, or 70 wt %, or 75 wt %, or
80 wt %, or 90 wt % to 95 wt %, or 99 wt %, or 99.5 wt % of the
silane functionalized polyolefin, based on the total weight of the
composition. In another embodiment, the composition contains from
20 wt % to 99.5 wt %, or from 50 wt % to 99 wt %, or from 75 wt %
to 99 wt %, or from 90 wt % to 95 wt % of the silane functionalized
polyolefin, based on the total weight of the composition.
[0096] Blends of silane functionalized polyolefins may also be
used, and the silane-functionalized polyolefin(s) may be diluted
with one or more other polyolefins to the extent that the
polyolefins are (i) miscible or compatible with one another, and
(ii) the silane functionalized polyolefin(s) constitutes from 40 wt
%, or 50 wt %, or 55 wt %, or 60 wt %, or 65 wt %, or 70 wt %, or
75 wt %, or 80 wt %, or 85 wt %, or 90 wt %, or 95 wt %, or 98 wt
%, or 99 wt % to less than 100 wt % of the blend (based on the
combined weight of the polyolefins, including the silane
functionalized polyolefin).
[0097] In an embodiment, the composition includes the
silane-functionalized polyolefin and a polyolefin that is an
ethylene-based polyolefin. The ethylene-based polyolefin is
different than the silane functionalized polyolefin because the
ethylene-based polyolefin is not silane functionalized. In an
embodiment, the ethylene-based polyolefin is an ethylene plastomer
or elastomer. In another embodiment, the ethylene-based polyolefin
is an LDPE. In another embodiment, the ethylene-based polyolefin is
an ethylene/.alpha.-olefin copolymer, or further a maleic-anhydride
(MAH)-grafted ethylene/.alpha.-olefin copolymer. In an embodiment,
the .alpha.-olefin is a C.sub.4-C.sub.8 .alpha.-olefin. In another
embodiment, the ethylene-based polyolefin is a copolymer of
ethylene and maleic anhydride (such as ZeMac.TM. E60 or ZeMac.TM.
M603, available from Vertellus Holdings LLC), or a random ethylene
copolymer with a comonomer that is classified as being a maleic
anhydride equivalent for application purposes (such as FUSABOND.TM.
M603, available from DuPont).
[0098] In an embodiment, the composition includes a polymeric blend
containing, consisting essentially of, or consisting of the
silane-functionalized polyolefin; optionally, one or more ethylene
plastomer or elastomer; optionally, one or more MAH-grafted
ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer; and optionally,
one or more LDPE. The silane functionalized polyolefin constitutes
from 40 wt %, or 50 wt %, or 55 wt %, or 60 wt %, or 65 wt %, or 70
wt %, or 75 wt %, or 80 wt %, or 85 wt %, or 90 wt %, or 95 wt %,
or 98 wt %, or 99 wt % to less than 100 wt % of the polymeric
blend. In an embodiment, the polymeric blend contains, consists
essentially of, or consists of (i) from 40 wt %, or 50 wt %, or 55
wt %, or 60 wt %, or 65 wt % to 70 wt %, or 75 wt %, or 80 wt %
Si-g-PE; (ii) from 1 wt %, or 5 wt %, or 10 wt %, or 15 wt %, or 20
wt %, or 25 wt % to 30 wt %, or 35 wt %, or 40 wt %, or 45 wt %, or
50 wt %, or 55 wt % ethylene plastomer or elastomer (e.g., an
ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer); (iii) from 1 wt
%, or 5 wt % to 10 wt %, or 15 wt %, or 20 wt %, or 25 wt %, or 30
wt %, or 35 wt %, or 40 wt %, or 45 wt %, or 50 wt %, or 55 wt %
MAH-grafted ethylene/C.sub.4-C.sub.8 .alpha.-olefin copolymer; and
(iv) from 0.1 wt %, or 0.5 wt %, or 0.8 wt % to 1.0 wt %, or 5 wt
%, or 10 wt %, or 15 wt %, or 20 wt %, or 25 wt %, or 30 wt %, or
35 wt %, or 40 wt %, or 45 wt %, or 50 wt %, or 55 wt % LDPE, based
on the total weight of the polymeric blend.
[0099] In an embodiment, the composition includes a polymeric blend
containing, consisting essentially of, or consisting of (i)
Si-g-PE, (ii) a first ethylene-based polymer, (iii) optionally, a
second ethylene-based polymer, (iv) optionally, a third
ethylene-based polymer, (v) optionally, a fourth ethylene-based
polymer, and (vi) optionally, a fifth ethylene-based polymer. The
ethylene-based polymers are different than the Si-g-PE because the
ethylene-based polymers are not silane functionalized. Each
ethylene-based polymer is compositionally, structurally, and/or
physically different than the other ethylene-based polymers present
in the composition. In other words, the first ethylene-based
polymer is compositionally, structurally, and/or physically
different than each of the second ethylene-based polymer, the third
ethylene-based polymer, the fourth ethylene-based polymer, and the
fifth ethylene-based polymer.
[0100] The silane functionalized polyolefin may comprise two or
more embodiments disclosed herein.
[0101] B. Hindered Amine Light Stabilizer (HALS)
[0102] The present composition includes a hindered amine light
stabilizer (HALS) having a weight average molecular weight, Mw,
greater than 5,000 Dalton (g/mol).
[0103] In an embodiment, the HALS has a Mw greater than 5,000
Dalton, or greater than 7,500 Dalton, or greater than 10,000
Dalton. In an embodiment, the HALS has a Mw from greater than 5,000
Dalton to 50,000 Dalton. In another embodiment, the HALS has a Mw
from 5,500 Dalton, or 6,000 Dalton, or 7,000 Dalton, or 7,500
Dalton, or 8,000 Dalton, or 10,000 Dalton, or 11,000 Dalton, or
11,500 Dalton to 12,000 Dalton, or 13,000 Dalton, or 15,000 Dalton,
or 20,000 Dalton, or 25,000 Dalton, or 30,000 Dalton, or 35,000
Dalton, or 40,000 Dalton, or 45,000 Dalton, or 50,000 Dalton. In
another embodiment, the HALS has a Mw from 5,500 Dalton to 50,000
Dalton, or from 6,000 Dalton to 20,000 Dalton, or from 10,000
Dalton to 15,000 Dalton, or from 11,000 Dalton to 15,000
Dalton.
[0104] In an embodiment, the HALS with a Mw greater than 5,000
Dalton is a polymeric HALS. A "polymeric HALS" is a HALS with
repeating monomeric units as shown in the following Structure
(B):
##STR00002##
wherein
[0105] m is an integer from 3 to 20;
[0106] n is an integer from 2 to 12;
[0107] A.sup.1 and A.sup.2 each is independently selected from
hydrogen, linear and branched C.sub.1-C.sub.12 alkyl groups,
C.sub.3-C.sub.8 alkenyl groups, and C.sub.7-C.sub.19 aralkyl
groups;
[0108] R.sup.1 and R.sup.2 each is independently selected from
oxygen and a group of Structure (C):
##STR00003##
[0109] A.sup.3 is selected from hydrogen, linear and branched
C.sub.1-C.sub.12 alkyl groups, C.sub.5-C.sub.12 cycloalkyl groups,
and C.sub.7-C.sub.19 aralkyl groups;
[0110] X is a --(CH.sub.2).sub.p-- group, wherein p is an integer
from 2 to 12, with the proviso that p is a different integer than
n;
[0111] Y is selected from C.sub.1-C.sub.18 alkyl groups, a group of
Structure (D), and a group of Structure (E):
##STR00004##
[0112] Z is selected from an O-A.sup.4 group, a S-A.sup.4 group,
and a group of Structure (F):
##STR00005##
and
[0113] A.sup.4 and A.sup.5 each is independently selected from
hydrogen; linear and branched C.sub.1-C.sub.18 alkyl groups;
C.sub.5-C.sub.12 cycloalkyl groups; C.sub.7-C.sub.12 aralkyl
groups; C.sub.6-C.sub.12 aryl groups; or may form, together with
the nitrogen atom to which they are linked, a C.sub.5-C.sub.7
heterocycle; and a piperidine group of Structure (G):
##STR00006##
[0114] In Structure (B), m refers to the number of repeating units
of the piperidine compound.
[0115] In an embodiment, the HALS has the Structure (B), wherein: m
is an integer from 3 to 20; n is an integer from 3 to 12; A.sup.1
and A.sup.2 each is hydrogen; R.sup.1 and R.sup.2 each is a group
of Structure (C); A.sup.3 is a linear C.sub.4 alkyl group; X is a
--(CH.sub.2).sub.2-- group; Y is a group of Structure (D); Z is a
group of Structure (F); and A.sup.4 and A.sup.5 each is a
piperidine group of Structure (G).
[0116] In an embodiment, the HALS with a Mw greater than 5,000
Dalton has the following Structure (H):
##STR00007##
wherein m is an integer from 3 to 20.
[0117] A nonlimiting example of a suitable HALS having the
Structure (H) is UVASORB.TM. HA10 (CAS 136504-96-6), available from
3V Sigma USA. UVASORB.TM. HA10 has a Mw of 11,600 Dalton.
[0118] In an embodiment, the HALS with a Mw greater than 5,000
Dalton is a poly(styryl-co-styryl isocyanate) having a HALS
functional group bonded to the terminal isocyanate chain end, as
described in Singh, R. P. et al, Journal of Applied Polymer
Science, Vol. 90, 1126-1138 (2003), the entire contents of which
are herein incorporated by reference.
[0119] In an embodiment, the composition contains from 0.10 wt %,
or 0.15 wt %, or 0.20 wt % to 0.25 wt %, or 0.30 wt %, or 0.35 wt
%, or 0.40 wt %, or 0.45 wt %, or 0.50 wt % HALS having a Mw
greater than 5,000 Dalton, based on the total weight of the
composition. In another embodiment, the composition contains from
0.10 wt % to 0.50 wt %, or from 0.20 wt % to 0.40 wt %, or from
0.30 wt % to 0.40 wt % HALS having a Mw greater than 5,000 Dalton,
based on the total weight of the composition.
[0120] The HALS may comprise two or more embodiments disclosed
herein.
[0121] C. Additives
[0122] The present composition may include one or more additives.
Nonlimiting examples of suitable additives include antioxidants,
colorants, corrosion inhibitors, lubricants, silanol condensation
catalysts, ultra violet (UV) absorbers or stabilizers,
anti-blocking agents, coupling agents, compatibilizers,
plasticizers, fillers, processing aids, moisture scavengers, scorch
retardants, metal deactivators, siloxanes, and combinations
thereof.
[0123] In an embodiment, the composition includes an antioxidant.
"Antioxidant" refers to types or classes of chemical compounds that
are capable of being used to minimize the oxidation that can occur
during the processing of polymers. Nonlimiting examples of suitable
antioxidants include high molecular weight hindered phenols and
multifunctional phenols such as sulfur and phosphorous-containing
phenol. A nonlimiting example of a suitable hindered phenol is
pentaerythritol
tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate),
commercially available as Irganox.RTM. 1010 from BASF. In an
embodiment, the composition contains from 0 wt %, or 0.001 wt %, or
0.01 wt %, or 0.02 wt %, or 0.05 wt %, or 0.1 wt %, or 0.2 wt %, or
0.3 wt % to 0.4 wt %, or 0.5 wt %, or 0.6 wt %, or 0.7 wt %, or 0.8
wt %, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %
antioxidant, based on total weight of the composition.
[0124] In an embodiment, the composition includes silanol
condensation catalyst, such as Lewis and Bronsted acids and bases.
A "silanol condensation catalyst" promotes crosslinking of the
silane functionalized polyolefin. Lewis acids are chemical species
that can accept an electron pair from a Lewis base. Lewis bases are
chemical species that can donate an electron pair to a Lewis acid.
Nonlimiting examples of suitable Lewis acids include the tin
carboxylates such as dibutyl tin dilaurate (DBTDL), and various
other organo-metal compounds such as lead naphthenate, zinc
caprylate and cobalt naphthenate. Nonlimiting examples of suitable
Lewis bases include the primary, secondary and tertiary amines.
These catalysts are typically used in moisture cure applications.
In an embodiment, the composition includes from 0 wt %, or 0.001 wt
%, or 0.005 wt %, or 0.01 wt %, or 0.02 wt %, or 0.03 wt % to 0.05
wt %, or 0.1 wt %, or 0.2 wt %, or 0.5 wt %, or 1.0 wt %; or from
0.01 wt % to 0.50 wt % silanol condensation catalyst, based on the
total weight of the composition. During the MONOSIL.TM. process,
the silanol condensation catalyst is typically added to the
reaction-extruder so that it is present during the grafting
reaction of silane to the polyolefin backbone to form the in situ
Si-g-PO. As such, the silane functionalized polyolefin may
experience some coupling (light crosslinking) before it leaves the
extruder with the completion of the crosslinking after it has left
the extruder, typically upon exposure to moisture (e.g., a sauna
bath or a cooling bath) and/or the humidity present in the
environment in which it is stored, transported or used.
[0125] In an embodiment, the silanol condensation catalyst is
included in a catalyst masterbatch blend, and the catalyst
masterbatch is included in the composition. Nonlimiting examples of
suitable catalyst master batches include those sold under the trade
name SI-LINK.TM. from The Dow Chemical Company, including
SI-LINK.TM. DFDA-5481 Natural. SI-LINK.TM. DFDA-5481 Natural is a
catalyst masterbatch containing a blend of 1-butene/ethene polymer,
ethene homopolymer, phenolic compound antioxidant, dibutyltin
dilaurate (DBTDL) (a silanol condensation catalyst), and a phenolic
hydrazide compound. In an embodiment, the composition contains from
0 wt %, or 0.001 wt %, or 0.01 wt %, or 0.1 wt %, or 0.3 wt %, or
0.5 wt %, or 1.0 wt %, or 2.0 wt %, or 3.0 wt %, or 4.0 wt % to 5.0
wt %, or 6.0 wt %, or 7.0 wt %, or 8.0 wt %, or 9.0 wt %, or 10.0
wt % silanol condensation catalyst or catalyst masterbatch, based
on total weight of the composition.
[0126] In an embodiment, the composition includes an ultraviolet
(UV) absorber or stabilizer that is compositionally and/or
structurally distinct from the HALS having an Mw greater than 5,000
Dalton. A nonlimiting example of a suitable UV stabilizer is a HALS
having a Mw less than 5,000 Dalton, such as
1,3,5-Triazine-2,4,6-triamine,
N,N-1,2-ethanediylbisN-3-4,6-bisbutyl(1,2,2,6,6-pentamethyl-4-piperidinyl-
)amino-1,3,5-triazin-2-ylaminopropyl-N,N-dibutyl-N,N-bis(1,2,2,6,6-pentame-
thyl-4-piperidinyl)-1,5,8,12-tetrakis[4,6-bis(n-butyl-n-1,2,2,6,6-pentamet-
hyl-4-piperidylamino)-1,3,5-triazin-2-yl]-1,5,8,12-tetraazadodecane,
which is commercially available as SABO.TM. STAB UV-119 from SABO
S.p.A. of Levate, Italy. Another nonlimiting example of a suitable
UV absorber is benzophenone, which is commercially available as
CHIMMASORB-81.TM. from BASF. In an embodiment, the composition
contains from 0 wt %, or 0.001 wt %, or 0.002 wt %, or 0.005 wt %,
or 0.006 wt % to 0.007 wt %, or 0.008 wt %, or 0.009 wt %, or 0.01
wt %, or 0.1 wt %, or 0.2 wt %, or 0.3 wt %, or 0.4 wt %, or 0.5 wt
%, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt % UV absorber
or stabilizer, based on total weight of the composition. In another
embodiment, the composition contains from 0.01 wt % to 3.0 wt %, or
from 0.01 wt % to 1.0 wt %, or from 0.01 wt % to 0.50 wt %, or from
0.20 wt % to 0.40 wt % UV absorber, based on the total weight of
the composition.
[0127] In an embodiment, the composition excludes HALS having a Mw
less than 5,000 Dalton.
[0128] In an embodiment, the composition includes a metal
deactivator. Metal deactivators suppress the catalytic action of
metal surfaces and traces of metallic minerals. Metal deactivators
convert the traces of metal and metal surfaces into an inactive
form, e.g., by sequestering. Non-limiting examples of suitable
metal deactivators include
1,2-bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamoyl)hydrazine,
2,2'-oxamindo bis[ethyl
3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], and oxalyl
bis(benzylidenehydrazide) (OABH). The metal deactivator is present
in an amount from 0 wt %, or greater than 0 wt %, or 0.01 wt %, or
0.02 wt %, or 0.03 wt %, or 0.04 wt % to 0.05 wt %, or 0.1 wt %, or
0.5 wt %, or 1 wt %, or 2 wt %, or 3 wt %, or 5 wt %, or 8 wt %, or
10 wt %, based on the total weight of the composition.
[0129] In an embodiment, the composition includes a filler.
Nonlimiting examples of suitable fillers include zinc oxide, zinc
borate, zinc molybdate, zinc sulfide, carbon black, organo-clay,
and combinations thereof. The filler may or may not have flame
retardant properties. In an embodiment, the filler is coated with a
material (such as stearic acid) that will prevent or retard any
tendency that the filler might otherwise have to interfere with the
silane cure reaction. In an embodiment, the composition contains
from 0 wt %, or 0.01 wt %, or 0.02 wt %, or 0.05 wt %, or 0.1 wt %,
or 0.2 wt %, or 0.4 wt % to 0.5 wt %, or 0.6 wt %, or 0.8 wt %, or
1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %, or 5.0 wt %, or
8.0 wt %, or 10.0 wt %, or 20 wt % filler (such as carbon black),
based on total weight of the composition.
[0130] In an embodiment, the composition includes a processing aid.
Nonlimiting examples of suitable processing aids include oils,
organic acids (such as stearic acid), and metal salts of organic
acids (such as zinc stearate). In an embodiment, the composition
contains from 0 wt %, or 0.01 wt %, or 0.02 wt %, or 0.05 wt %, or
0.1 wt %, or 0.2 wt %, or 0.3 wt %, or 0.4 wt % to 0.5 wt %, or 0.6
wt %, or 0.7 wt %, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt
% processing aid, based on total weight of the composition.
[0131] In an embodiment, the composition includes a moisture
scavenger. Moisture scavengers remove or deactivate unwanted water
in the composition to prevent unwanted (premature) crosslinking and
other water-initiated reactions in the composition during storage
or at extrusion conditions. Non-limiting examples of moisture
scavengers include organic compounds selected from ortho esters,
acetals, ketals or silanes such as alkoxysilanes. In an embodiment,
the moisture scavenger is an alkoxy silane (e.g.,
hexadecyltrimethoxysilane, octyltrimethoxysilane, or
octyltriethoxysilane). The alkoxy silane moisture scavenger is not
grafted to a polyolefin or copolymerized with an olefin such as
ethylene. The moisture scavenger is present in an amount from 0 wt
%, or greater than 0 wt %, or 0.01 wt %, or 0.02 wt %, or 0.03 wt
%, or 0.04 wt %, or 0.05 wt %, or 0.1 wt % to 0.2 wt %, or 0.3 wt
%, or 0.5 wt %, or 0.75 wt %, or 1.0 wt %, or 1.5 wt %, or 2.0 wt
%, or 3.0 wt %, based on the total weight of the composition.
[0132] In an embodiment, the composition includes a siloxane. A
nonlimiting example of a suitable siloxane is a
polydimethylsiloxane (PDMS). A nonlimiting example of a suitable
PDMS is dimethylvinylsilyl terminated polydimethylsiloxane. In an
embodiment, PDMS is included in a PDMS masterbatch blend, and the
PDMS masterbatch is included in the composition. A nonlimiting
example of a suitable PDMS masterbatch is MB50-002 Masterbatch,
available from Dow Corning. MB50-002 Masterbatch includes 50 wt %
dimethylvinylsilyl terminated PDMS dispersed in LDPE, based on the
total weight of the masterbatch. In an embodiment, the composition
contains from 0.2 wt %, or 0.5 wt %, or 0.8 wt % to 1.0 wt %, or
1.5 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %, or 5.0 wt %
siloxane, based on the total weight of the composition. In another
embodiment, the composition contains from 0.5 wt %, or 1.0 wt %, or
1.5 wt %, or 1.8 wt % to 2.0 wt %, or 2.5 wt %, or 3.0 wt %, or 5.0
wt % PDMS masterbatch, based on the total weight of the
composition.
[0133] In an embodiment, the composition includes an additive
selected from a silanol condensation catalyst (which may be
included in a catalyst masterbatch blend), a UV absorber (e.g.,
benzophenone), and combinations thereof.
[0134] In an embodiment, the composition contains from 0 wt %, or
greater than 0 wt %, or 0.001 wt %, or 0.002 wt %, or 0.005 wt %,
or 0.006 wt % to 0.007 wt %, or 0.008 wt %, or 0.009 wt %, or 0.01
wt %, or 0.1 wt %, or 0.2 wt %, or 0.3 wt %, or 0.4 wt %, or 0.5 wt
%, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %, or 4.0 wt %,
or 5.0 wt % to 6.0 wt %, or 7.0 wt %, or 8.0 wt %, or 9.0 wt %, or
10.0 wt %, or 15.0 wt %, or 20.0 wt % additive, based on the total
weight of the composition.
[0135] The additive may comprise two or more embodiments disclosed
herein.
[0136] D. Composition
[0137] In an embodiment, the composition includes: (A) a silane
functionalized polyolefin (e.g., a silane functionalized
polyethylene); (B) a hindered amine light stabilizer (HALS) having
a Mw greater than 5,000 Dalton; (C) optional additive.
[0138] The silane functionalized polyolefin; HALS having a Mw
greater than 5,000 Dalton; and optional additive may be any
respective silane functionalized polyolefin; HALS having a Mw
greater than 5,000 Dalton; and optional additive disclosed
herein.
[0139] In an embodiment, the composition is void of, or
substantially void of, aflame retardant. A "flame retardant" is a
compound that inhibits or delays the spread of fire by suppressing
combustion reactions. Nonlimiting examples of flame retardants
include halogen-free flame retardants and halogenated flame
retardants.
[0140] In an embodiment, the composition is void of, or
substantially void of, a halogenated flame retardant. A
"halogenated flame retardant" is a flame retardant compound that
contains at least one halogen atom. A nonlimiting example of a
halogenated flame retardant is a brominated flame retardant such as
decabromodiphenylethane (e.g., Saytex.TM. 8010, available from
Albemarle Corporation), brominated polyphenyl ether (e.g., Emerald
Innovation.TM. 1000, available from Great Lakes Solutions), and
brominated styrene/butadiene block copolymer (e.g., Emerald
Innovation.TM. 3000, available from LANXESS).
[0141] In an embodiment, the composition is void of, or
substantially void of, halogen-free flame retardant. Nonlimiting
examples of halogen-free flame retardants include metal hydrates,
silica, glass powder, metal carbonate, antimony trioxide, and
combinations thereof. In an embodiment, the halogen-free flame
retardant is a metal hydrate. A nonlimiting example of a metal
hydrate is magnesium hydroxide.
[0142] In an embodiment, the composition contains, consists
essentially of, or consists of: (A) from 20 wt %, or 25 wt %, or 30
wt %, or 35 wt %, or 40 wt %, or 45 wt %, or 50 wt %, or 55 wt %,
or 60 wt %, or 65 wt %, or 70 wt %, or 75 wt %, or 80 wt %, or 90
wt % to 95 wt %, or 99 wt %, or 99.5 wt % silane functionalized
polyolefin; (B) from 0.10 wt %, or 0.15 wt %, or 0.20 wt % to 0.25
wt %, or 0.30 wt %, or 0.35 wt %, or 0.40 wt %, or 0.45 wt %, or
0.50 wt % HALS having a Mw greater than 5,000 Dalton; and (C) from
0 wt %, or greater than 0 wt %, or 0.001 wt %, or 0.002 wt %, or
0.005 wt %, or 0.006 wt % to 0.007 wt %, or 0.008 wt %, or 0.009 wt
%, or 0.01 wt %, or 0.1 wt %, or 0.2 wt %, or 0.3 wt %, or 0.4 wt
%, or 0.5 wt %, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %,
or 4.0 wt %, or 5.0 wt % to 6.0 wt %, or 7.0 wt %, or 8.0 wt %, or
10.0 wt %, or 15.0 wt %, or 20.0 wt % additive (e.g., a UV
absorber, a silanol condensation catalyst, or a combination
thereof). Ina further embodiment, the composition is void of flame
retardant.
[0143] It is understood that the sum of the components in each of
the foregoing compositions yields 100 weight percent (wt %).
[0144] In an embodiment, the composition yields a wet insulation
resistance (IR) greater than 500 megaohm/3.048 meter (Mohm/3.048
m), or greater than 600 Mohm/3.048 m, or greater than 700
Mohm/3.048 mat 90.degree. C. from 6 hours to 7 weeks, or from 6
hours to 9 weeks, or from 6 hours to 12 weeks, or from 6 hours to
24 weeks, or from 6 hours to 36 weeks.
[0145] In an embodiment, the composition yields a wet IR from 800
Mohm/3.048 m, or 1,000 Mohm/3.048 m, or 1,300 Mohm/3.048 m, or
1,500 Mohm/3.048 m to 2,000 Mohm/3.048 m, or 3,00 Mohm/3.048 m, or
4,000 Mohm/3.048 m, or 5,000 Mohm/3.048 m, or 10,000 Mohm/3.048 m,
or 15,000 Mohm/3.048 m, or 20,000 Mohm/3.048 m, or 30,000
Mohm/3.048 m, or 40,000 Mohm/3.048 m, or 50,000 Mohm/3.048 m at
90.degree. C. from 6 hours to 7 weeks, or from 6 hours to 9 weeks,
or from 6 hours to 12 weeks, or from 6 hours to 24 weeks, or from 6
hours to 36 weeks.
[0146] In an embodiment, the composition yields a wet IR ratio from
0.4, or 0.5, or 0.6, or 0.7, or 0.8, or 0.9, or 1.0 to 1.1, or 1.5,
or 2.0, or 3.0, or 5.0, or 10, or 15, or 20.
[0147] In an embodiment, the composition has a tensile stress at
break from 500 psi (3.45 megaPascal (MPa)), or 700 psi (4.83 MPa),
or 1,000 psi (6.90 MPa), or 1,500 psi (10.34 MPa), or 2,000 psi
(13.79 MPa), or 2,100 psi (14.48 MPa), or 2,150 psi (14.82 MPa), or
2,160 psi (14.89 MPa), or 2,165 psi (14.93 MPa) to 2,200 psi (15.17
MPa), or 2,500 psi (17.24 MPa), or 3,000 psi (20.68 MPa), or 4,000
psi (27.58 MPa), or 5,000 psi (34.47 MPa).
[0148] In an embodiment, the composition has a tensile elongation
at break from 100%, or 125%, or 130%, or 140%, or 144% to 150%, or
200%, or 250%, or 300%, or 400%, or 440%, or 450%, or 500%, or
600%, or 700%, or 800%.
[0149] In an embodiment, the composition yields a crush resistance
from 800 lb-f (362.81 kg-f), or 1,000 lb-f (453.51 kg-f), or 1,200
lb-f (544.22 kg-f), or 1,500 lb-f (680.27 kg-f), or 1,520 lb-f
(689.34 kg-f), or 1,550 lb-f (702.95 kg-f), or 1,600 lb-f (725.62
kg-f) to 2,000 lb-f (907.03 kg-f), or 2,500 lb-f (1133.79 kg-f), or
3,000 lb-f (1360.54 kg-f). In another embodiment, the composition
yields a crush resistance greater than 1,600 lb-f (725.62
kg-f).
[0150] In an embodiment, the composition has a hot creep from 0%,
or 1%, or 2%, or 5%, or 6% to 7%, or 10%, or 15%, or 20%, or 30%,
or 40%, or 50%, or 60%, or 70%, or 80%, or 90%, or 100%, or 150%,
or 170% at 0.2 MPa and 150.degree. C.
[0151] In an embodiment, the composition yields a retained
dielectric strength (retained ACBD) after glancing impact from 20%,
or 30%, or 35%, or 40%, or 45%, or 50%, or 55%, or 60%, or 65%, or
70%, or 75%, or 80%, or 85%, or 90%, or 95% to 100%; or from 20% to
100%, or from 75% to 100%.
[0152] In an embodiment, the composition contains, consists
essentially of, or consists of: (A) silane functionalized
polyolefin (e.g., a silane/ethylene copolymer); (B) HALS having a
Mw greater than 5,000 Dalton (e.g., of Structure (H)); (C) UV
absorber (e.g., benzophenone); and (D) silanol condensation
catalyst. In a further embodiment, the composition has one, some,
or all of the following properties: (i) a tensile stress at break
from 2,150 psi (14.82 MPa), or 2,160 psi (14.89 MPa), or 2,165 psi
(14.93 MPa) to 2,200 psi (15.17 MPa), or 2,500 psi (17.24 MPa), or
3,000 psi (20.68 MPa), or 4,000 psi (27.58 MPa), or 5,000 psi
(34.47 MPa); and/or (ii) a tensile elongation at break from 144% to
150%, or 200%, or 250%, or 300%, or 400%, or 440%, or 450%, or
500%, or 600%, or 700%, or 800%; and/or (iii) a hot creep from 0%,
or 1%, or 2%, or 5%, or 6% to 7% at 0.2 MPa and 150.degree. C.;
and/or (iv) the composition yields a crush resistance greater than
1,600 lb-f (725.62 kg-f); and/or (v) the composition is void of
flame retardant.
[0153] In an embodiment, the composition is halogen-free.
[0154] In an embodiment, the composition contains, consists
essentially of, or consists of: (A) from 20 wt %, or 25 wt %, or 30
wt %, or 35 wt %, or 40 wt %, or 45 wt %, or 50 wt %, or 55 wt %,
or 60 wt %, or 65 wt %, or 70 wt %, or 75 wt %, or 80 wt %, or 90
wt % to 95 wt %, or 99 wt %, or 99.5 wt % silane functionalized
polyolefin (e.g., a silane/ethylene copolymer); (B) from 0.10 wt %,
or 0.15 wt %, or 0.20 wt % to 0.25 wt %, or 0.30 wt %, or 0.35 wt
%, or 0.40 wt %, or 0.45 wt %, or 0.50 wt % HALS having a Mw
greater than 5,000 Dalton (e.g., of Structure (H)); and (C) from 0
wt %, or greater than 0 wt %, or 0.001 wt %, or 0.002 wt %, or
0.005 wt %, or 0.006 wt % to 0.007 wt %, or 0.008 wt %, or 0.009 wt
%, or 0.01 wt %, or 0.1 wt %, or 0.2 wt %, or 0.3 wt %, or 0.4 wt
%, or 0.5 wt %, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %,
or 4.0 wt %, or 5.0 wt % to 6.0 wt %, or 7.0 wt %, or 8.0 wt %, or
9.0 wt %, or 10.0 wt %, or 15.0 wt %, or 20.0 wt % additive (e.g.,
a UV absorber, a silanol condensation catalyst, or a combination
thereof); and the composition or coated conductor has one, some, or
all of the following properties: (i) a wet IR from 500 Mohm/3.048
m, or 800 Mohm/3.048 m, or 1,000 Mohm/3.048 m, or 1,500 Mohm/3.048
m to 5,000 Mohm/3.048 m, or 10,000 Mohm/3.048 m, or 15,000
Mohm/3.048 m, or 20,000 Mohm/3.048 m, or 30,000 Mohm/3.048 m, or
50,000 Mohm/3.048 m at 90.degree. C. from 6 hours to 24 weeks;
and/or (ii) a wet IR ratio from 0.4, or 0.5, or 0.6, or 0.7, or
0.8, or 0.9, or 1.0 to 1.1, or 1.5, or 2.0, or 3.0, or 5.0; and/or
(iii) a tensile stress at break from 500 psi (3.45 megaPascal
(MPa)), or 1,000 psi (6.90 MPa), or 2,000 psi (13.79 MPa), or 2,100
psi (14.48 MPa), or 2,150 psi (14.82 MPa), or 2,160 psi (14.89
MPa), or 2,165 psi (14.93 MPa) to 2,200 psi (15.17 MPa), or 2,500
psi (17.24 MPa), or 3,000 psi (20.68 MPa), or 4,000 psi (27.58
MPa), or 5,000 psi (34.47 MPa); and/or (iv) a tensile elongation at
break from 100%, or 125%, or 130%, or 140%, or 144% to 150%, or
200%, or 250%, or 300%, or 400%, or 440%, or 450%, or 500%, or
600%, or 700%, or 800%; and/or (v) a crush resistance from 800 lb-f
(362.81 kg-f), or 1,000 lb-f (453.51 kg-f), or 1,200 lb-f (544.22
kg-f), or 1,500 lb-f (680.27 kg-f), or 1,520 lb-f (689.34 kg-f), or
1,550 lb-f (702.95 kg-f), or 1,600 lb-f (725.62 kg-f) to 2,000 lb-f
(907.03 kg-f), or 2,500 lb-f (1133.79 kg-f), or 3,000 lb-f (1360.54
kg-f); and/or (vi) a hot creep from 0%, or 1%, or 2%, or 5%, or 6%
to 7%, or 10%, or 15%, or 20% at 0.2 MPa and 150.degree. C.; and/or
(vii) a retained ACBD after glancing impact from 20%, or 25%, or
30%, or 35%, or 40%, or 45%, or 50%, or 55%, or 60%, or 65%, or
70%, or 75%, or 80%, or 85%, or 90%, or 95% to 100%; and/or (viii)
the composition is halogen-free; and/or (ix) the composition is
void of flame retardant.
[0155] In an embodiment, the composition is moisture-curable. In
another embodiment, the composition is crosslinked.
[0156] The composition may comprise two or more embodiments
disclosed herein.
[0157] E. Coated Conductor
[0158] The present disclosure also provides a coated conductor. The
coated conductor includes a conductor and a coating on the
conductor, the coating including a composition. The composition
includes a silane functionalized polyolefin; a HALS having a Mw
greater than 5,000 Dalton; and optional additive.
[0159] The composition may be any composition disclosed herein. The
silane functionalized polyolefin, HALS having a Mw greater than
5,000 Dalton, and optional additive may be any respective silane
functionalized polyolefin, HALS having a Mw greater than 5,000
Dalton, and optional additive disclosed herein.
[0160] In an embodiment, the composition contains an additive
selected from a UV absorber, a silanol condensation catalyst, and a
combination thereof.
[0161] In an embodiment, the composition is void of, or
substantially void of, flame retardant.
[0162] In an embodiment, the coating is void of, or substantially
void of, flame retardant.
[0163] In an embodiment, the coated conductor is void of, or
substantially void of, flame retardant.
[0164] In an embodiment, the coating is an insulation sheath for a
conductor. In another embodiment, the coating is a jacket for a
conductor.
[0165] The process for producing a coated conductor includes
heating the present composition to at least the melting temperature
of the silane functionalized polyolefin, and then extruding the
polymeric melt blend onto the conductor. The term "onto" includes
direct contact or indirect contact between the polymeric melt blend
and the conductor. The polymeric melt blend is in an extrudable
state.
[0166] The coating is located on the conductor. The coating may be
one or more inner layers such as an insulating layer. The coating
may wholly or partially cover or otherwise surround or encase the
conductor. The coating may be the sole component surrounding the
conductor. When the coating is the sole component surrounding the
conductor, the coating may serve as a jacket and/or an insulation.
In an embodiment, the coating is the outermost layer on the coated
conductor. Alternatively, the coating may be one layer of a
multilayer jacket or sheath encasing the metal conductor. In an
embodiment, the coating directly contacts the conductor. In another
embodiment, the coating directly contacts an insulation layer
surrounding the conductor.
[0167] In an embodiment, the coating directly contacts the
conductor. The term "directly contacts," as used herein, is a
coating configuration whereby the coating is located immediately
adjacent to the conductor, the coating touches the conductor, and
no intervening layers, no intervening coatings, and/or no
intervening structures, are present between the coating and the
conductor.
[0168] In another embodiment, the coating indirectly contacts the
conductor. The term "indirectly contacts," as used herein, is a
coating configuration whereby an intervening layer, an intervening
coating, or an intervening structure, is present between the
coating and the conductor. Nonlimiting examples of suitable
intervening layers, intervening coatings, and intervening
structures include insulation layers, moisture barrier layers,
buffer tubes, and combinations thereof. Nonlimiting examples of
suitable insulation layers include foamed insulation layers,
thermoplastic insulation layers, crosslinked insulation layers, and
combinations thereof.
[0169] The coating is crosslinked. In an embodiment, crosslinking
of the present composition begins in the extruder, but only to a
minimal extent. In another embodiment, crosslinking is delayed
until the composition is extruded upon the conductor. Crosslinking
of the present composition can be initiated and/or accelerated
through exposure to humid environment (e.g., ambient conditions or
cure in a sauna or water bath), and/or the application of heat
(including when peroxides are used for crosslinking) or radiation.
In an embodiment, after extrusion, the coated conductor is
conditioned at humid conditions to cause crosslinking of the
polymer layers and yield suitably low hot creep values (e.g., from
1% to 7%, measured at 150.degree. C. or 200.degree. C.).
[0170] In an embodiment, the coated conductor has a wet IR greater
than greater than 500 Mohm/3.048 m, or greater than 600 Mohm/3.048
m, or greater than 700 Mohm/3.048 m at 90.degree. C. from 6 hours
to 7 weeks, or from 6 hours to 9 weeks, or from 6 hours to 12
weeks, or from 6 hours to 24 weeks, or from 6 hours to 36
weeks.
[0171] In an embodiment, the coated conductor has a wet IR from 800
Mohm/3.048 m, or 1,000 Mohm/3.048 m, or 1,300 Mohm/3.048 m, or
1,500 Mohm/3.048 m to 2,000 Mohm/3.048 m, or 3,00 Mohm/3.048 m, or
4,000 Mohm/3.048 m, or 5,000 Mohm/3.048 m, or 10,000 Mohm/3.048 m,
or 15,000 Mohm/3.048 m, or 20,000 Mohm/3.048 m, or 30,000
Mohm/3.048 m, or 40,000 Mohm/3.048 m, or 50,000 Mohm/3.048 m at
90.degree. C. from 6 hours to 7 weeks, or from 6 hours to 9 weeks,
or from 6 hours to 12 weeks, or from 6 hours to 24 weeks, or from 6
hours to 36 weeks.
[0172] In an embodiment, the coated conductor has a wet IR ratio
from 0.4, or 0.5, or 0.6, or 0.7, or 0.8, or 0.9, or 1.0 to 1.1, or
1.5, or 2.0, or 3.0, or 5.0, or 10, or 15, or 20.
[0173] In an embodiment, the coated conductor is halogen-free.
[0174] In an embodiment, the coated conductor has a retained ACBD
after glancing impact greater than 20%, or greater than 75%, or
from 20%, or 25%, or 30%, or 35%, or 40%, or 45%, or 50%, or 55%,
or 60%, or 65%, or 70%, or 75%, or 80%, or 85%, or 90%, or 95% to
100%.
[0175] In an embodiment, the coating includes a composition
containing, consisting essentially of, or consisting of: (A) silane
functionalized polyolefin (e.g., a silane/ethylene copolymer); (B)
HALS having a Mw greater than 5,000 Dalton (e.g., of Structure
(H)); (C) UV absorber (e.g., benzophenone); and (D) silanol
condensation catalyst. Ina further embodiment, the composition has
one, some, or all of the following properties: (i) a tensile stress
at break from 2,150 psi (14.82 MPa), or 2,160 psi (14.89 MPa), or
2,165 psi (14.93 MPa) to 2,200 psi (15.17 MPa), or 2,500 psi (17.24
MPa), or 3,000 psi (20.68 MPa), or 4,000 psi (27.58 MPa), or 5,000
psi (34.47 MPa); and/or (ii) a tensile elongation at break from
144% to 150%, or 200%, or 250%, or 300%, or 400%, or 440%, or 450%,
or 500%, or 600%, or 700%, or 800%; and/or (iii) a hot creep from
0%, or 1%, or 2%, or 5%, or 6% to 7% at 0.2 MPa and 150.degree. C.;
and/or or (iv) the composition is void of flame retardant. The
coated conductor has a crush resistance greater than 1,600 lb-f
(725.62 kg-f).
[0176] The coated conductor includes a conductor and a coating on
the conductor, the coating including a composition. In an
embodiment, the composition contains, consists essentially of, or
consists of: (A) from 20 wt %, or 25 wt %, or 30 wt %, or 35 wt %,
or 40 wt %, or 45 wt %, or 50 wt %, or 55 wt %, or 60 wt %, or 65
wt %, or 70 wt %, or 75 wt %, or 80 wt %, or 90 wt % to 95 wt %, or
99 wt %, or 99.5 wt % of the silane functionalized polyolefin
(e.g., a silane/ethylene copolymer); (B) from 0.10 wt %, or 0.15 wt
%, or 0.20 wt % to 0.25 wt %, or 0.30 wt %, or 0.35 wt %, or 0.40
wt %, or 0.45 wt %, or 0.50 wt % HALS having a Mw greater than
5,000 Dalton (e.g., a HALS of Structure (H)); and (C) from 0 wt %,
or greater than 0 wt %, or 0.001 wt %, or 0.002 wt %, or 0.005 wt
%, or 0.006 wt % to 0.007 wt %, or 0.008 wt %, or 0.009 wt %, or
0.01 wt %, or 0.1 wt %, or 0.2 wt %, or 0.3 wt %, or 0.4 wt %, or
0.5 wt %, or 1.0 wt %, or 2.0 wt %, or 2.5 wt %, or 3.0 wt %, or
4.0 wt %, or 5.0 wt % to 6.0 wt %, or 7.0 wt %, or 8.0 wt %, or
10.0 wt %, or 15.0 wt %, or 20.0 wt % additive (e.g., a UV
absorber, a silanol condensation catalyst, or a combination
thereof); and
the coated conductor has one, some, or all of the following
properties: (i) a wet IR from 800 Mohm/3.048 m, or 1,000 Mohm/3.048
m, or 1,500 Mohm/3.048 m to 5,000 Mohm/3.048 m, or 10,000
Mohm/3.048 m, or 15,000 Mohm/3.048 m, or 20,000 Mohm/3.048 m, or
30,000 Mohm/3.048 m, or 40,000 Mohm/3.048 m, or 50,000 Mohm/3.048 m
at 90.degree. C. from 0 to 24 weeks; and/or (ii) a wet IR ratio
from 0.4, or 0.5, or 0.6, or 0.7, or 0.8, or 0.9, or 1.0 to 1.1, or
1.5, or 2.0, or 3.0, or 5.0; (iii) a crush resistance from 800 lb-f
(362.81 kg-f), or 1,000 lb-f (453.51 kg-f), or 1,200 lb-f (544.22
kg-f), or 1,500 lb-f (680.27 kg-f), or 1,520 lb-f (689.34 kg-f), or
1,550 lb-f (702.95 kg-f), or 1,600 lb-f (725.62 kg-f) to 2,000 lb-f
(907.03 kg-f), or 2,500 lb-f (1133.79 kg-f), or 3,000 lb-f (1360.54
kg-f); and/or (iv) the coated conductor is halogen-free; and/or (v)
the coated conductor is void of flame retardant; and the
composition has one, some, or all of the following properties: (1)
a tensile stress at break from 500 psi (3.45 megaPascal (MPa)), or
1,000 psi (6.90 MPa), or 2,000 psi (13.79 MPa), or 2,100 psi (14.48
MPa), or 2,150 psi (14.82 MPa), or 2,160 psi (14.89 MPa), or 2,165
psi (14.93 MPa) to 2,200 psi (15.17 MPa), or 2,500 psi (17.24 MPa),
or 3,000 psi (20.68 MPa), or 4,000 psi (27.58 MPa), or 5,000 psi
(34.47 MPa); and/or (2) a tensile elongation at break from 100%, or
125%, or 130%, or 140%, or 144% to 150%, or 200%, or 250%, or 300%,
or 400%, or 440%, or 450%, or 500%, or 600%, or 700%, or 800%;
and/or (3) a hot creep from 0%, or 1%, or 2%, or 5%, or 6% to 7%,
or 10%, or 15%, or 20% at 0.2 MPa and 150.degree. C.; and/or (4)
the composition is void of flame retardant.
[0177] In an embodiment, the coated conductor is selected from a
fiber optic cable, a communications cable (such as a telephone
cable or a local area network (LAN) cable), a power cable, wiring
for consumer electronics, a power cable, a power charger wire for
cell phones and/or computers, computer data cords, power cords,
appliance wiring material, home interior wiring material, consumer
electronic accessory cords, and any combination thereof.
[0178] In another embodiment, the present composition is
melt-shaped into an article other than a coating on a conductor,
e.g., an electrical connector or a component of an electrical
connector.
[0179] The coated conductor may comprise two or more embodiments
disclosed herein.
[0180] Byway of example, and not limitation, some embodiments of
the present disclosure will now be described in detail in the
following Examples.
Examples
[0181] The materials used in the examples are provided in Table 1
below.
TABLE-US-00001 TABLE 1 Materials Component Specification Source
SI-LINK .TM.AC DFDB- ethylene/silane copolymer; 1.5 wt %
vinyltrimethoxysilane; The Dow 5451 NT density = 0.922 g/cc; Melt
Index = 1.5 g/10 min; Chemical Tm = 149-210.degree. C. Company
SI-LINK .TM. DFDA-5481 Silanol Condensation Catalyst Masterbatch
containing a The Dow Natural blend of 1-butene/ethene polymer,
ethene homopolymer, Chemical a phenolic compound, dibutyltin
dilaurate (DBTDL), and a Company phenolic hydrazide compound
UVASORB .TM. HA10 hindered amine light stabilizer (CAS
136504-96-6); 3V Sigma USA Mw = 11,600 Dalton; Structure (H)
(depicted above) SABO .TM. STAB UV-119 hindered amine light
stabilizer; CAS 106990-43-6; SABO S.p.A. Mw = 2,286 Dalton
CHIMMASORB-81 .TM. benzophenone UV absorber BASF
A. Production of Coated Conductors Using Ethylene/Silane
Copolymer
[0182] Example 1 (Ex 1) and Comparative Sample 2 (CS 2) are
prepared by melt mixing the components of Table 2, except for the
SI-LINK.TM. DFDA-5481 Natural (silanol condensation catalyst
masterbatch), using a Brabender at around 140.degree. C. for 5
minutes. The resulting blend containing SI-LINK.TM. AC DFDB-5451 NT
(ethylene/silane copolymer) is pelletized into small pieces for
wire extrusion.
[0183] In the extrusion step, the silanol condensation catalyst
masterbatch (SI-LINK.TM. DFDA-5481 Natural), is added with either
(i) the pelletized mixture (for Ex 1 and CS 2) or (ii) SI-LINK.TM.
AC DFDB-5451 NT (ethylene/silane copolymer) (for CS 3), to extrude
the composition onto 14 AWG single strand copper wire with a
diameter of 0.064 inches (1.6256 mm). The composition forms a
coating on the conductor. The coating is indirect contact with the
conductor. The coating wall thickness is set around 30 mil (762
.mu.m) and the extrusion temperature is from 140.degree. C. to a
head temperature of 165.degree. C. (zone 1:140.degree. C., zone
2:150.degree. C., zone 3:160.degree. C., head/die: 165.degree. C.).
The concentration of silanol condensation catalyst (DBTDL) in the
overall composition is in the range of 0.01 wt % to 0.5 wt %.
[0184] The amount of each component present in each final
composition, prior to extrusion and cure (i.e., crosslinking), is
provided in Table 2 below. In other words, the wt % of each
component for the individual samples is provided as the amount of
each component in the formulation that is melt blended in the
extruder, prior to moisture-induced crosslinking (said crosslinking
occurring after extrusion).
[0185] The coated conductors are cured in a 90.degree. C. water
bath overnight (16 hours) and the cured wires are cut into segments
of varying lengths for testing. The properties of the samples,
including wet IR, are measured after curing (crosslinking).
[0186] The properties of each sample are provided in Table 2 below.
The amounts provided in Table 2 are in weight percent, based on the
total weight of the respective composition. In Table 2, "CS" refers
to a comparative sample.
TABLE-US-00002 TABLE 2 Ex 1 CS 2 CS 3 SI-LINK .TM. AC DFDB-5451 NT
(ethylene/silane copolymer) 94.3 94.3 95.0 SABO .TM. STAB UV-119
(HALS, Mw = 2,286 Dalton) -- 0.35 -- UVASORB .TM. HA10 (HALS, Mw =
11,600 Dalton) 0.35 -- -- CHIMMASORB-81 .TM. (UV absorber) 0.35
0.35 -- SI-LINK .TM. DFDA-5481 Natural 5.0 5.0 5.0 (silanol
condensation catalyst masterbatch) Total wt % 100 100 100 Hot Creep
(%) 7 8 8 Tensile Stress at Break (psi) 2168 2120 2159 Tensile
Stress at Break (MPa) 14.95 14.62 14.89 Tensile Strain at Break (%)
144 143 140 Crush Resistance (lb-f) >1600 >1600 >1600
Crush Resistance (kg-f) >725.75 >725.75 >725.75
[0187] As shown in Table 2, CS 2 is a comparative coated conductor
with a coating composition containing (A) ethylene/silane copolymer
(SI-LINK.TM. AC DFDB-5451 NT), (B) a UV absorber
(CHIMMASORB-81.TM.), and (C) a HALS having a Mw less than 5,000
Dalton (SABO.TM. STAB UV-119).
[0188] CS 3 is a comparative coated conductor with a coating that
lacks a HALS and UV absorber. Instead, CS 3 contains (A)
ethylene/silane copolymer (SI-LINK.TM. AC DFDB-5451 NT), and is not
light stabilized. In other words, the coating composition of CS 3
is not protected from the effects of photo-oxidation, making the CS
3 coating unsuitable for wire and cable applications with UV
exposure.
[0189] Applicant unexpectedly found that a coated conductor with a
coating composition containing (A) ethylene/silane copolymer
(SI-LINK.TM. AC DFDB-5451 NT), (B) UV absorber (CHIMMASORB-81.TM.);
and (C) a HALS having a Mw greater than 5,000 Dalton (UVASORB.TM.
HA10) (Ex 1) advantageously exhibits improved mechanical properties
(i.e., tensile stress at break and tensile strain at break) and hot
creep compared to CS 2 and CS 3. Additionally, not wishing to be
bound by any particular theory, it is believed that Ex 1 will
advantageously exhibit improved long-term UV resistance compared to
CS 2 due to the comparatively lower migration, lower volatility,
and improved extraction resistance due to the high molecular weight
(Mw greater than 5,000 Dalton) of UVASORB.TM. HA10 that is present
in Ex 1.
[0190] It is specifically intended that the present disclosure not
be limited to the embodiments and illustrations contained herein,
but include modified forms of those embodiments including portions
of the embodiments and combinations of elements of different
embodiments as come within the scope of the following claims.
* * * * *