US4414363A
Expired / Lapsed
US
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Rubber composition
Assignee: Zeon Corp
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Filing: 1982-06-16
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Granted: 1983-11-08
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Expires: 2002-06-16
Abstract
Abstract A rubber composition comprising as main components (1) at least one rubber having a glass transition temperature of from -45° C. to 0° C. and selected from the group consisting of an isoprene-butadiene copolymer rubber and polyisoprene rubber and (2) at least one rubber selected from the group consisting of natural rubber and cis-1,4-polyisoprene rubber having a cis-1,4-linkage content of at least 90 mole %, said composition having a value, defined by the following formula, of at least 10, [(R-53)+(S-100)] wherein R is a rebound (%) measured at 51° C. by a Dunlop Tripso meter for a vulcanized product of said rubber composition, and S, as defined in the specification, is a wet skid resistance index on a road surface defined by ASTM E-303-74 which is determined at 19° C. by a portable skid tester for a vulcanized product of said rubber composition.
Inventors
- 👤 Shuichi Akita
- 👤 Takeshi Chida
- 👤 Hiroyuki Watanabe
- 👤 Akio Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:59
CPC Classifications
C; C08; C08L; C08L7/00; C08L9/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
171 words
A rubber composition comprising as main components (1) 25 to 75% by weight of at least one essentially amorphous rubber having a glass transition temperature of from -45° C. to 0° C., a Mooney viscosity (ML 1+4 , 100° C.) of 20-200 and 1,2-linkages, 3,4-linkages or both 1,2- and 3,4-linkages and selected from the group consisting of an isoprene-butadiene copolymer rubber, polyisoprene rubber and mixtures thereof and (2) 75 to 25% by weight of at least one rubber selected from the group consisting of natural rubber; cis-1,4-polyisoprene rubber having a cis-1,4-linkage content and mixture thereof of at least 90 mole%, said composition having a value, defined by the following formula, of at least 10, ((R-53)+(S-100)) wherein R is a rebound (%) measured at 51° C. by a Dunlop Tripso meter for vulcanized product of said rubber composition, and a wet skid resistance index S which is determined at 19° C. by a portable skid tester for a vulcanized product of said rubber composition on a road surface defined by ASTM E-303-74.
Claim 2
Dependent Claim
171 words
A rubber composition comprising as main components (1) 25 to 75% by weight of at least one essentially amorphous rubber having a glass transition temperature of from -45° C. to 0° C., a Mooney viscosity (ML 1+4 , 100° C.) of 20-200 and 1,2-linkages, 3,4-linkages or both 1,2- and 3,4-linkages and selected from the group consisting of an isoprene-butadiene copolymer rubber, polyisoprene rubber and mixtures thereof and (2) 75 to 25% by weight of at least one rubber selected from the group consisting of natural rubber; cis-1,4-polyisoprene rubber having a cis-1,4-linkage content and mixture thereof of at least 90 mole%, said composition having a value, defined by the following formula, of at least 10, ((R-53)+(S-100)) wherein R is a rebound (%) measured at 51° C. by a Dunlop Tripso meter for vulcanized product of said rubber composition, and a wet skid resistance index S which is determined at 19° C. by a portable skid tester for a vulcanized product of said rubber composition on a road surface defined by ASTM E-303-74.
Claim 3
Dependent Claim
22 words
The rubber composition of claim 1 wherein the rubber (1) has a glass transition temperature of from -40° C. to -15° C.
Claim 4
Dependent Claim
36 words
The rubber composition of claim 1 or 2 wherein the essentially amorphous rubber component (1) comprises the isoprene-butadiene copolymer rubber wherein the isoprene unit content of the isoprene-butadiene copolymer rubber is at least 5% by weight.
Claim 5
Dependent Claim
22 words
The rubber composition of claim 3 wherein the isoprene unit content of the isoprene-butadiene copolymer rubber is at least 10% by weight.
Claim 6
Dependent Claim
25 words
The rubber composition of claim 1 or 2 wherein the rubber (1) has a Mooney viscosity (ML 1+4 , 100° C.) of 30 to 150.
Claim 7
Dependent Claim
16 words
The rubber composition of claim 1 wherein the essentially amorphous rubber component (1) comprises polyisoprene rubber.
Claim 8
Dependent Claim
24 words
The rubber composition of claim 1 wherein the essentially amorphous rubber component (1) is a mixture of the isoprene-butadiene copolymer rubber and polyisoprene rubber.
Claim 9
Dependent Claim
14 words
The rubber composition of claim 1 wherein the rubber component (2) is natural rubber.
Claim 10
Dependent Claim
14 words
The rubber composition of claim 1 wherein the rubber component (2) is cis-1,4-polyisoprene rubber.
Claim 11
Dependent Claim
20 words
The rubber composition of claim 1 wherein the rubber component (2) is a mixture of natural rubber and cis-1,4-polyisoprene rubber.
References Cited (Backward Citations)
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US3919130A
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US4350621A
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US4220564A
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US4321168A
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US4323485A
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |