Patent US4250273A successfully refreshed from Google Patents.
US4250273A
Expired / Lapsed
US
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Thermoplastic elastomer blends
Assignee: Bridgestone Firestone Inc
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Filing: 1979-01-08
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Granted: 1981-02-10
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Expires: 1999-01-08
Abstract
Abstract Thermoplastic elastomer compositions of the present invention comprise a blend of from about 10 to about 50 parts by weight of a crystalline 1-olefin polymer, from about 80 to about 15 parts by weight of a styrene-butadiene rubber, and from about 5 to about 55 parts by weight of a highly saturated elastomer. The thermoplastic blends have very good physical properties, especially tear strength, tensile strength, elongation at break, low temperature impact resistance, minimum creep at high temperatures, and smooth surfaces when injection molded. The compositions, which may be partially cured, also have excellent aging properties, as well as paint adhesion. The compositions are a true thermoplastic in that they can be repeatedly processed and yet maintain their good physical properties.
Inventors
- 👤 Georg G. A. Bohm
- 👤 Gary R. Hamed
- 👤 Lee E. Vescelius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:31
CPC Classifications
C; C08; C08L; C08L21/00; C08K; C08K3/00; C08K3/02; C08K3/04; C08K3/06; C08K3/18; C08K3/20; C08K3/22; C08K5/00; C08K5/04; C08K5/09; C08L23/00; C08L23/02; C08L23/10; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L25/10; C08L53/00; C08L53/02; C08L53/025; C08L9/00; C08L9/06; C08L2205/00; C08L2205/03; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/0869; C08L23/16; C08L23/18; C08L23/20; C08L23/22; C08L2312/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
161 words
A thermoplastic elastomer composition comprising, a blend of from about 10 to about 50 parts by weight of a crystalline 1-olefin polymer, said 1-olefin polymer selected from the class consisting of a homopolymer or a copolymer made from 1-olefin monomers having from 2 to 20 carbon atoms, said homopolymer or said copolymer having a melting point of at least 90° C.; from about 80 to about 15 parts by weight of a random styrene-butadiene rubber copolymer; and from about 5 to about 55 parts by weight of a highly saturated elastomer, said highly saturated elastomer selected from the class consisting of a hydrogenated polymer diene having from 4 to 10 carbon atoms, and a hydrogenated diblock or triblock copolymer made from conjugated dienes having from 4 to 10 carbon atoms and vinyl substituted aromatics having from 8 to 12 carbon atoms, the amount of said saturation of said saturated elastomer being at least 70 percent, said blend forming a thermoplastic elastomer.
Claim 2
Dependent Claim
161 words
A thermoplastic elastomer composition comprising, a blend of from about 10 to about 50 parts by weight of a crystalline 1-olefin polymer, said 1-olefin polymer selected from the class consisting of a homopolymer or a copolymer made from 1-olefin monomers having from 2 to 20 carbon atoms, said homopolymer or said copolymer having a melting point of at least 90° C.; from about 80 to about 15 parts by weight of a random styrene-butadiene rubber copolymer; and from about 5 to about 55 parts by weight of a highly saturated elastomer, said highly saturated elastomer selected from the class consisting of a hydrogenated polymer diene having from 4 to 10 carbon atoms, and a hydrogenated diblock or triblock copolymer made from conjugated dienes having from 4 to 10 carbon atoms and vinyl substituted aromatics having from 8 to 12 carbon atoms, the amount of said saturation of said saturated elastomer being at least 70 percent, said blend forming a thermoplastic elastomer.
Claim 3
Dependent Claim
53 words
A thermoplastic elastomer composition according to claim 1, wherein said 1-olefin homopolymer is selected from the class consisting of polyethylene and polypropylene, wherein said 1-olefin copolymer consists of ethylene-propylene, and wherein the amount of said butadiene by weight in said random styrene-butadiene rubber copolymer ranges from about 60 percent to about 90 percent.
Claim 4
Dependent Claim
74 words
A thermoplastic elastomer composition according to claim 2, wherein the amount of said 1-olefin polymer ranges from about 30 to about 45 parts by weight, wherein the amount of said styrene-butadiene rubber ranges from about 50 to about 20 parts by weight, and wherein the amount of said saturated elastomer ranges from about 8 to about 35 parts by weight and the amount of saturation of said saturated elastomer is at least 90 percent.
Claim 5
Dependent Claim
57 words
A thermoplastic elastomer composition according to claim 3, wherein said 1-olefin homopolymer is polypropylene, wherein said 1-olefin copolymer is made from a major amount by weight of propylene monomers and a minor amount by weight of ethylene monomers, and wherein said highly saturated elastomer is selected from the class consisting of a hydrogenated polybutadiene and hydrogenated polyisoprene.
Claim 6
Dependent Claim
57 words
A thermoplastic elastomer composition according to claim 4, wherein the molecular weight of said polypropylene or said polypropylene copolymer ranges from about 20,000 to about 1,000,000, wherein the molecular weight of said styrene-butadiene rubber ranges from about 50,000 to about 1,000,000, and wherein the molecular weight of said saturated elastomer ranges from about 10,000 to about 1,000,000.
Claim 7
Dependent Claim
23 words
A thermoplastic elastomer composition according to claim 5, wherein the melting point of said 1-olefin polymer or copolymer is at least 130° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |