Elastomeric compositions
First Claim
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1. A thermoplastic elastomer composition comprising:
- (i) at least one low molecular weight polyalphaolefin comprising oligomers of C5 to C18 olefins, wherein the polyalphaolefin has a number average molecular weight, Mn, of 300 to 15,000 g/mol, a kinematic viscosity of 10 cSt or more at 100°
C., a pour point of −
20°
C. or less according to ASTM D97, a flash point of 200°
C. or more according to ASTM D56, a specific gravity of 0.855 or less, and a viscosity index of 130 or more;
(ii) 10.0 to 30.0 wt % of a block copolymer obtainable by selectively hydrogenating a block copolymer having terminal polymeric blocks of a vinyl aromatic monomer and a mid-block prepared originally with an olefin and subsequently hydrogenated; and
(iii) 5.0 to 50.0 wt % of polypropylene having a weight average molecular weight, Mw, of 30,000 to 2,000,000 g/mol;
wherein the wt % are based on the total weight of the composition; and
(iv) with the proviso that when (i) is a PAO having a number average molecular weight, Mn, of between about 400 and 1000 g/mole;
(a) (iii) is a homopolymer characterized by an MFR greater than 2 g/10 min under 2.16 kg load, or(b) (iii) is a copolymer;
or(c) (iii) is a polymer or copolymer made by a metallocene catalyst;
or(d) the composition does not contain calcium carbonate; and
(v) wherein the composition after aging at 125°
C. in air for 5 days has all of the following parameters;
(a) decrease in 100% Tensile Modulus of less than 15%;
(b) decrease in Tensile Strength of less than 55%;
(c) decrease in Elongation at Break of less than 25%; and
(d) decrease in Toughness of less than 60%,and the decrease is measured relative to the original sample prior to aging.
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Abstract
This invention relates a composition comprising:
- (i) at least one low molecular weight polyolefin;
- (ii) a block copolymer obtainable by selectively hydrogenating a block copolymer having terminal polymeric blocks of a vinyl aromatic monomer and a mid-block prepared originally with an olefin and subsequently hydrogenated; and
- (iii) polypropylene;
- (iv) with the proviso that when (i) is a PAO having a molecular weight of between about 400 and 1000 g/mole, either:
- (a) (iii) is a homopolymer characterized by an MFR greater than 2 g/10 min,
- (b) (iii) is a copolymer; or
- (c) (iii) is a polymer or copolymer made by a metallocene catalyst; or
- (d) the composition does not contain calcium carbonate.
605 Citations
37 Claims
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1. A thermoplastic elastomer composition comprising:
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(i) at least one low molecular weight polyalphaolefin comprising oligomers of C5 to C18 olefins, wherein the polyalphaolefin has a number average molecular weight, Mn, of 300 to 15,000 g/mol, a kinematic viscosity of 10 cSt or more at 100°
C., a pour point of −
20°
C. or less according to ASTM D97, a flash point of 200°
C. or more according to ASTM D56, a specific gravity of 0.855 or less, and a viscosity index of 130 or more;(ii) 10.0 to 30.0 wt % of a block copolymer obtainable by selectively hydrogenating a block copolymer having terminal polymeric blocks of a vinyl aromatic monomer and a mid-block prepared originally with an olefin and subsequently hydrogenated; and (iii) 5.0 to 50.0 wt % of polypropylene having a weight average molecular weight, Mw, of 30,000 to 2,000,000 g/mol; wherein the wt % are based on the total weight of the composition; and (iv) with the proviso that when (i) is a PAO having a number average molecular weight, Mn, of between about 400 and 1000 g/mole; (a) (iii) is a homopolymer characterized by an MFR greater than 2 g/10 min under 2.16 kg load, or (b) (iii) is a copolymer;
or(c) (iii) is a polymer or copolymer made by a metallocene catalyst;
or(d) the composition does not contain calcium carbonate; and (v) wherein the composition after aging at 125°
C. in air for 5 days has all of the following parameters;(a) decrease in 100% Tensile Modulus of less than 15%; (b) decrease in Tensile Strength of less than 55%; (c) decrease in Elongation at Break of less than 25%; and (d) decrease in Toughness of less than 60%, and the decrease is measured relative to the original sample prior to aging. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A thermoplastic elastomer composition comprising:
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(i) at least one low molecular weight polyalphaolefin comprising oligomers of C5 to C18 olefins, wherein the polyalphaolefin has a number average molecular weight, Mn, of 300 to 15,000 g/mol, a kinematic viscosity of 10 cSt or more at 100°
C., a pour point of −
20°
C. or less according to ASTM D97, a flash point of 200°
C. or more according to ASTM D56, a specific gravity of 0.855 or less, and a viscosity index of 130 or more;(ii) 50.0 to 70.0 wt % of a block copolymer obtainable by selectively hydrogenating a block copolymer having terminal polymeric blocks of a vinyl aromatic monomer and a mid-block prepared originally with an olefin and subsequently hydrogenated; and (iii) 5.0 to 50.0 wt % of polypropylene having a weight average molecular weight, Mw, of 30,000 to 2,000,000 g/mol; wherein the wt % are based on the total weight of the composition; and (iv) with the proviso that when (i) is a PAO having a number average molecular weight, Mn, of between about 400 and 1000 g/mole; (a) (iii) is a homopolymer characterized by an MFR greater than 2 g/10 min under 2.16 kg load, or (b) (iii) is a copolymer;
or(c) (iii) is a polymer or copolymer made by a metallocene catalyst;
or(d) the composition does not contain calcium carbonate; and (v) wherein the composition after aging at 125°
C. in air for 5 days has all of the following parameters;(a) decrease in 100% Tensile Modulus of less than 15%; (b) decrease in Tensile Strength of less than 55%; (c) decrease in Elongation at Break of less than 25%; and (d) decrease in Toughness of less than 60%, and the decrease is measured relative to the original sample prior to aging.
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Specification
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Current AssigneeExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
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Original AssigneeExxonMobil Chemical Patents Inc. (Exxon Mobil Corporation)
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InventorsTse, Mun Fu, Mathew, Thottinal Abraham, Li, Feng
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Primary Examiner(s)MULLIS, JEFFREY C
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Application NumberUS11/482,283Publication NumberTime in Patent Office2,601 DaysField of Search525/98, 524/474, 524/490, 524/491US Class Current524/474CPC Class CodesC08L 2205/03 containing three or more po...C08L 23/00 Compositions of homopolymer...C08L 23/02 not modified by chemical af...C08L 23/04 Homopolymers or copolymers ...C08L 23/0815 Copolymers of ethene with a...C08L 23/10 Homopolymers or copolymers ...C08L 23/12 PolypropeneC08L 23/18 Homopolymers or copolymers ...C08L 2314/06 Metallocene or single site ...C08L 2666/02 Organic macromolecular comp...C08L 2666/06 Homopolymers or copolymers ...C08L 2666/24 Graft or block copolymers a...C08L 53/025 modifiedC08L 91/00 Compositions of oils, fats ...
