US4732928A
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Highly elastic thermoplastic elastomer composition
Assignee: Asahi Kasei Corp
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Filing: 1986-09-19
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Granted: 1988-03-22
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Expires: 2006-09-19
Abstract
Abstract A thermoplastic elastomer composition having superior compression set performance and moldability, comprising the following components (a) to (d): (a) a styrenic block copolymer having in the same molecule at least two of polymeric block A mainly comprised of vinyl aromatic compounds and at least one of polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 15% by weight and not more than 60% by weight; (b) a styrenic block copolymer having in the same molecule at least one of each of polymeric block A mainly comprised of vinyl aromatic compounds and polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 60% by weight and not more than 95% by weight; (c) a polyphenylene ether resin having the reduced viscosity ranging from 0.15 to 0.70 in 0.5 g/dl of a chloroform solution at 30° C.; and (d) a non-aromatic rubber softening oil, and the contents of said components (a), (b), (c) and (d) in the composition satisfying the following formulae (1), (2) and (3) in weight ratio: 2.0≧b/a≧0 (1) 1.4≧c/(a+b)≧0.1 (2) 3.0≧d/(a+b)≧0.1 (3); and a method for producing the thermoplastic elastomer composition comprising melt kneading the components (a) to (d) described above. The composition is useful in the field of automobile parts, electric wire coatings, footwear, toys, sundry goods, etc.
Inventors
- 👤 Ken Mizushiro
- 👤 Hideo Morita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; C; C08; C08L; C08L53/00; C08L53/02; C08L71/00; C08L71/08; C08L71/10; C08L71/12; C08L71/123; H01B3/42; H01B3/427
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
223 words
A thermoplastic elastomer composition having superior compression set performance and moldability, consisting essentially of the following components (a) to (d): (a) a styrenic block copolymer having in the same molecule at least two of polymeric block A mainly comprised of vinyl aromatic compounds and at least one of polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 15% by weight and not more than 60% by weight; (b) a styrenic block copolymer having in the same molecule at least one of each of polymeric block A mainly comprised of vinyl aromatic compounds and polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 60% by weight and not more than 95% by weight; (c) a polyphenylene ether resin having the reduced viscosity ranging from 0.15 to 0.70 in 0.5 g/dl of a chloroform solution at 30° C.; and (d) a non-aromatic rubber softening oil, and the contents of said components (a), (b), (c) and (d) in the composition satisfying the following formulae (1), (2) and (3) in weight ratio: 2.0≧b/a≧ (1) 1.4≧c/(a+b)≧0.1 (2) 3.0≧d/(a+b)≧0.1 (3), wherein the composition has a compression set of not higher than 60% as measured according to JIS K 6301 (70° C., 22 hrs., 25% compression).
Claim 2
Dependent Claim
223 words
A thermoplastic elastomer composition having superior compression set performance and moldability, consisting essentially of the following components (a) to (d): (a) a styrenic block copolymer having in the same molecule at least two of polymeric block A mainly comprised of vinyl aromatic compounds and at least one of polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 15% by weight and not more than 60% by weight; (b) a styrenic block copolymer having in the same molecule at least one of each of polymeric block A mainly comprised of vinyl aromatic compounds and polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 60% by weight and not more than 95% by weight; (c) a polyphenylene ether resin having the reduced viscosity ranging from 0.15 to 0.70 in 0.5 g/dl of a chloroform solution at 30° C.; and (d) a non-aromatic rubber softening oil, and the contents of said components (a), (b), (c) and (d) in the composition satisfying the following formulae (1), (2) and (3) in weight ratio: 2.0≧b/a≧ (1) 1.4≧c/(a+b)≧0.1 (2) 3.0≧d/(a+b)≧0.1 (3), wherein the composition has a compression set of not higher than 60% as measured according to JIS K 6301 (70° C., 22 hrs., 25% compression).
Claim 3
Dependent Claim
44 words
The thermoplastic elastomer composition according to claim 1, wherein said styrenic block copolymer of the component (a) is of an A-B-A type, a B-A-B-A type or a copolymer represented by (A-B) n -X-(B-A) m wherein X is a coupling agent and n and m≧1.
Claim 4
Dependent Claim
70 words
The thermoplastic elastomer composition according to claim 1, wherein said styrenic block copolymer of the component (b) is a straight chain type block copolymer of an A-B type, an A-B-A type or that represented by A-B-(A-B) n wherein n≧1, A-(B-A) n wherein n≧2, or B-(A-B) n wherein n≧2; or a coupling type block copolymer represented by (A-B) n -X-(B-A) m wherein n and m≧1 and X is a coupling agent.
Claim 5
Dependent Claim
33 words
The thermoplastic elastomer composition according to claim 1, wherein said styrenic block copolymer of the component (a) has a number average molecular weight of not lower than 70,000 and not higher than 500,000.
Claim 6
Dependent Claim
33 words
The thermoplastic elastomer composition according to claim 2, wherein said styrenic block copolymer of the component (a) has a number average molecular weight of not lower than 70,000 and not higher than 500,000.
Claim 7
Dependent Claim
33 words
The thermoplastic elastomer composition according to claim 1, wherein said styrenic block copolymer of the component (b) has a number average molecular weight of not lower than 30,000 and not higher than 300,000.
Claim 8
Dependent Claim
33 words
The thermoplastic elastomer composition according to claim 3, wherein said styrenic block copolymer of the component (b) has a number average molecular weight of not lower than 30,000 and not higher than 300,000.
Claim 9
Dependent Claim
22 words
The thermoplastic elastomer composition according to claim 1, wherein said polyphenylene ether resin of the component (c) is a 2,6-dimethyl-1,4-phenylene ether resin.
Claim 10
Dependent Claim
43 words
The thermoplastic elastomer composition according to claim 1, wherein said non-aromatic rubber softening oil of the component (d) is a paraffinic oil containing not more than 5.0% by weight of an aromatic component as measured according to the analytical method of ASTM 2140-63T.
Claim 11
Dependent Claim
34 words
The thermoplastic elastomer composition according to claim 1, wherein the contents of the components (a) to (d) satisfy the following formulae (4), (5) and (6) in weight ratio: 1.0≧b/a≧0 (4) 1.3≧c/(a+b)≧0.3 (5) 2.5≧d/(a+b)≧0.3 (6).
Claim 12
Dependent Claim
39 words
A thermoplastic elastomer composition according to any one of claims 1 to 10, wherein the composition has a melt flow index of not lower than 0.1 g/10 min. as measured according to JIS K 6870 (200° C., 5 kgf).
Claim 13
Dependent Claim
34 words
The thermoplastic elastomer composition according to claim 1, wherein the composition has a melt flow index of not lower than 0.1 g/10 min. as measured according to JIS K 6870 (200° C., 5 kgf).
Claim 14
Independent Claim
222 words
A method for producing a thermoplastic elastomer composition having superior compression set performance and moldability, comprising melt kneading the following components consisting essentially of (a) to (d): (a) a styrenic block copolymer having in the same molecule at least two of polymeric block A mainly comprised of vinyl aromatic compounds and at least one of polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 15% by weight and not more than 60% by weight; (b) a styrenic block copolymer having in the same molecule at least one of each of polymeric block A mainly comprised of vinyl aromatic compounds and polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 60% by weight and not more than 95% by weight; (c) a polyphenylene ether resin having the reduced viscosity ranging from 0.15 to 0.70 in a 0.5 g/dl of chloroform solution at 30° C.; and (d) a non-aromatic rubber softening oil, in such a mixing proportion satisfying the following formulae (1), (2) and (3) in weight ratio: 2.0≧b/a≧0 (1) 1.4≧c/(a+b)≧0.1 (2) 3.0≧d/(a+b)≧0.1 (3) wherein the composition produced has a compression set of not higher than 60% as measured according to JIS K 6301 (70° C., 22 hrs., 25% compression).
Claim 15
Independent Claim
222 words
A method for producing a thermoplastic elastomer composition having superior compression set performance and moldability, comprising melt kneading the following components consisting essentially of (a) to (d): (a) a styrenic block copolymer having in the same molecule at least two of polymeric block A mainly comprised of vinyl aromatic compounds and at least one of polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 15% by weight and not more than 60% by weight; (b) a styrenic block copolymer having in the same molecule at least one of each of polymeric block A mainly comprised of vinyl aromatic compounds and polymeric block B mainly comprised of conjugated diene compounds, and containing vinyl aromatic compounds in an amount of not less than 60% by weight and not more than 95% by weight; (c) a polyphenylene ether resin having the reduced viscosity ranging from 0.15 to 0.70 in a 0.5 g/dl of chloroform solution at 30° C.; and (d) a non-aromatic rubber softening oil, in such a mixing proportion satisfying the following formulae (1), (2) and (3) in weight ratio: 2.0≧b/a≧0 (1) 1.4≧c/(a+b)≧0.1 (2) 3.0≧d/(a+b)≧0.1 (3) wherein the composition produced has a compression set of not higher than 60% as measured according to JIS K 6301 (70° C., 22 hrs., 25% compression).
Claim 16
Dependent Claim
48 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein said styrenic block copolymer of the component (a) is of an A-B-A type, a B-A-B-A type or a copolymer represented by (A-B) n -X-(B-A) m wherein X is a coupling agent and n and m≧1.
Claim 17
Dependent Claim
74 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein said styrenic block copolymer of the component (b) is a straight chain type block copolymer of an A-B type, an A-B-A type or that represented by A-B-(A-B) n wherein n≧1, A-(B-A) n wherein n≧2, or B-(A-B) n wherein n≧2; or a coupling type block copolymer represented by (A-B) n -X-(B-A) m wherein n and m≧1 and X is a coupling agent.
Claim 18
Dependent Claim
37 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein said styrenic block copolymer of the component (a) has a number average molecular weight of not lower than 70,000 and not higher than 500,000.
Claim 19
Dependent Claim
37 words
The method for producing a thermoplastic elastomer composition according to claim 14, wherein said styrenic block copolymer of the component (a) has a number average molecular weight of not lower than 70,000 and not higher than 500,000.
Claim 20
Dependent Claim
37 words
The method for producing a tnermoplastic elastomer composition according to claim 13, wherein said styrenic block copolymer of the component (b) has a number average molecular weight of not lower than 30,000 and not higher than 300,000.
Claim 21
Dependent Claim
37 words
The method for producing a thermoplastic elastomer composition according to claim 15, wherein said styrenic block copolymer of the component (b) has a number average molecular weight of not lower than 30,000 and not higher than 300,000.
Claim 22
Dependent Claim
26 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein said polyphenylene ether resin of the component (c) is a 2,6-dimethyl-1,4-phenylene ether resin.
Claim 23
Dependent Claim
47 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein said non-aromatic rubber softening oil of the component (d) is a paraffinic oil containing not more than 5.0% by weight of an aromatic component as measured according to the analytical method of ASTM 2140-63T.
Claim 24
Dependent Claim
38 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein the contents of the components (a) to (d) satisfy the following formulae (4), (5) and (6) in weight ratio: 1.0≧b/a≧0 (4) 1.3≧c/(a+b)≧0.3 (5) 2.5≧d/(a+b)≧0.3 (6).
Claim 25
Independent Claim
43 words
A method for producing a thermoplastic elastomer composition according to any one of claims 13 to 23, wherein the composition has a melt flow index of not lower than 0.1 g/10 min. as measured according to JIS K 6870 (200° C., 5 kgf).
Claim 26
Dependent Claim
38 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein the composition has a melt flow index of not lower than 0.1 g/10 min. as measured according to JIS K 6870 (200° C., 5 kgf).
Claim 27
Dependent Claim
23 words
The method for producing a thermoplastic elastomer composition according to claim 13, wherein the melt kneading is carried out by a mechanical means.
Claim 28
Dependent Claim
38 words
The method for producing a thermoplastic elastomer composition according to claim 25, wherein said melt kneading is carried out by means of a monoaxial extruder, a biaxial extruder, a Banbury type mixer, a kneader or a heating roll.
Claim 29
Dependent Claim
29 words
The method for producing a thermoplastic elastomer composition according to claim 25, wherein said mechanical melt kneading is carried out at a temperature ranging from 170° to 230° C.
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