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US4304885A Expired / Lapsed US ⏱️ 0.0 years remaining

Polybutadiene rubber compositions

Assignee: JSR Corp
•
Filing: 1980-09-02
•
Granted: 1981-12-08
•
Expires: 2000-09-02
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Abstract

Abstract A polybutadiene rubber composition comprising (A) a polybutadiene rubber obtained by solution polymerization and having a Mooney viscosity (ML 1+4 100 ° C.) of 60-110 and a 1,4-configuration content of not less than 60%, preferably not less than 70%, and (B) a polybutadiene polymer obtained by solution polymerization and having a viscosity-average molecular weight of 20,000-140,000, preferably 40,000-100,000, and a 1,4-configuration content of not less than 60%, preferably not less than 70%, in which composition the weight ratio of (A)/(B) is 100/5-100/150, preferably 100/35-100/100, and the Mooney viscosity (ML 1+4 100 ° C.) of which composition is 20-70. This composition is high in tackiness in the unvulcanized state and also excellent in the physical properties of vulcanizate.

Inventors

  • 👤 Toshio Omori
  • 👤 Yutaka Obata
  • 👤 Noboru Ohshima

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 10:42
CPC Classifications
C; C08; C08L; C08L9/00; C08L2205/00; C08L2205/02

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 80 words
A polybutadiene rubber composition consisting essentially of (A) a polybutadiene rubber obtained by solution polymerization and having a Mooney viscosity (ML 1+4 100 ° C.) of 60-110 and a 1,4-configuration content of 60% or more and (B) a polybutadiene polymer obtained by solution polymerization and having a viscosity-average molecular weight of 20,000-140,000 and a 1,4-configuration content of 60% or more, said composition having an (A)/(B) weight ratio of 100/5-100/150 and a Mooney viscosity (ML 1+4 100 ° C.) of 20-70.
Claim 2
Dependent Claim 80 words
A polybutadiene rubber composition consisting essentially of (A) a polybutadiene rubber obtained by solution polymerization and having a Mooney viscosity (ML 1+4 100 ° C.) of 60-110 and a 1,4-configuration content of 60% or more and (B) a polybutadiene polymer obtained by solution polymerization and having a viscosity-average molecular weight of 20,000-140,000 and a 1,4-configuration content of 60% or more, said composition having an (A)/(B) weight ratio of 100/5-100/150 and a Mooney viscosity (ML 1+4 100 ° C.) of 20-70.
Claim 3
Dependent Claim 22 words
A polybutadiene rubber composition according to claim 1, wherein the polybutadiene rubber (A) has a cis-1,4-configuration content of not less than 70%.
Claim 4
Dependent Claim 31 words
A polybutadiene rubber composition according to claim 1 or 2, wherein the polybutadiene polymer (B) has a viscosity-average molecular weight of 40,000-100,000 and a cis-1,4-configuration content of not less than 70%.
Claim 5
Dependent Claim 28 words
A polybutadiene rubber composition according to claim 1, 2 or 3, wherein the (A)/(B) weight ratio in the composition is within the range of from 100/35 to 100/100.
Claim 6
Dependent Claim 52 words
A polybutadiene rubber composition according to claim 1, wherein the polybutadiene rubber (A) has a Mooney viscosity of 65-85 and a cis-1,4-configuration content of at least 80%, the polybutadiene polymer (B) has a viscosity-average-molecular weight of 50,000-100,000 and a cis-1,4-configuration content of at least 70%, and the (A)/(B) weight ratio is 100/50-100/100.

References Cited (Backward Citations)

US3281389A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-12-07 1985-06-08 1985-12-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-12-07 1989-06-08 1989-12-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-12-07 1993-06-08 1993-12-08 $7700.00 Window Closed / Lapsed

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