Patent US5232987A successfully refreshed from Google Patents.
US5232987A
Expired / Lapsed
US
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Rubber compositions
Assignee: Bridgestone Corp
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Filing: 1991-09-05
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Granted: 1993-08-03
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Expires: 2011-09-05
Abstract
Abstract A rubber composition having an excellent wear resistance while holding proper hardness, modulus and the like as a vulcanizate comprises a blend of (A) styrene-diene copolymer rubber having specified content of bound styrene, glass transition temperature range and Mooney viscosity and (B) low molecular weight polymer having particular weight average molecular weight, wherein the blending ratio of the copolymer rubber (A) to the polymer (B) is 100 parts by weight to 10-120 parts by weight.
Inventors
- 👤 Mitsuhiko Sakakibara
- 👤 Fumio Tsutsumi
- 👤 Makoto Kondo
- 👤 Yoshiro Yagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:18
CPC Classifications
C; C08; C08L; C08L9/00; C08L9/06; C08L9/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
A rubber composition comprising: (A) a styrene-diene copolymer rubber produced by emulsion polymerization having a content of bound styrene of 10-65% by weight, a glass transition temperature range (ΔTg) of not lower than 10° C., and a Mooney viscosity (ML 1+4 , 100° C.) of 60-200, and (B) a low molecular weight polymer having a weight average molecular weight of 5,000-200,000, wherein said polymer (B) is a styrene-diene polymer, wherein the blending ratio of said copolymer (A) to said polymer (B) is 100 parts by weight to 10-120 parts by weight, and wherein the Mooney viscosity (ML 1+4 , 100° C.) of the rubber composition after the blending is not less than 20.
Claim 2
Dependent Claim
113 words
A rubber composition comprising: (A) a styrene-diene copolymer rubber produced by emulsion polymerization having a content of bound styrene of 10-65% by weight, a glass transition temperature range (ΔTg) of not lower than 10° C., and a Mooney viscosity (ML 1+4 , 100° C.) of 60-200, and (B) a low molecular weight polymer having a weight average molecular weight of 5,000-200,000, wherein said polymer (B) is a styrene-diene polymer, wherein the blending ratio of said copolymer (A) to said polymer (B) is 100 parts by weight to 10-120 parts by weight, and wherein the Mooney viscosity (ML 1+4 , 100° C.) of the rubber composition after the blending is not less than 20.
Claim 3
Dependent Claim
20 words
The rubber composition according to claim 1, wherein said glass transition temperature range (ΔTg) is now lower than 30° C.
Claim 4
Dependent Claim
16 words
The rubber composition according to claim 1, wherein said bound styrene content is 20-45% by weight.
Claim 5
Dependent Claim
18 words
The rubber composition according to claim 1, wherein said Mooney viscosity of said copolymer rubber (A) is 100-200.
Claim 6
Dependent Claim
31 words
The rubber composition according to claim 1, wherein said blending ratio of said polymer (B) per 100 parts by weight of said copolymer rubber (A) is 20-100 parts by weight. pg,33
Claim 7
Dependent Claim
19 words
The rubber composition according to claim 1, wherein said polymer (B) has a weight average molecular weight of 10,000-150,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |