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US 4,304,885 AGranted
Polybutadiene rubber compositions
AssigneeJapan Synthetic Rubber Co., Ltd.
InventorsToshio Omori, Yutaka Obata, Noboru Ohshima
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AssigneeJapan Synthetic Rubber Co., Ltd.
InventorsToshio Omori, Yutaka Obata, Noboru Ohshima
Estimating the term…
A polybutadiene rubber composition comprising (A) a polybutadiene rubber obtained by solution polymerization and having a Mooney viscosity (ML.sub.1+4.sup.100.degree. 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.sub.1+4.sup.100.degree. 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.
A polybutadiene rubber composition consisting essentially of (A) a polybutadiene rubber obtained by solution polymerization and having a Mooney viscosity (ML.sub.1+4.sup.100.degree. 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.sub.1+4.sup.100.degree. C.) of 20-70.
Dependencies are inferred from the claim text.