Branched conjugated diene copolymer, rubber composition and pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorKensuke Washizu
Life of this patent
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Abstract
There is provided a branched conjugated diene copolymer prepared by copolymerizing 1 to 99% by weight of a branched conjugated diene compound (1): wherein R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, and 99 to 1% by weight of a conjugated diene compound (2): wherein R2 and R3 are the same or different and each is a hydrogen atom, or the like. The branched conjugated diene copolymer is useful as a rubber component of a rubber composition for a tire enhancing both of abrasion resistance and grip performance to a high level and exhibiting excellent processability.
Claims20
A branched conjugated diene copolymer prepared by copolymerizing monomers consisting of a branched conjugated diene compound and a conjugated diene compound, wherein a copolymerization ratio of the branched conjugated diene compound is 1 to 40% by weight, a copolymerization ratio of the conjugated diene compound is 99 to 60% by weight, the branched conjugated diene compound is farnesene, the conjugated diene compound is 1,3-butadiene, and the branched conjugated diene copolymer has a weight-average molecular weight in a range of 3,000 to 3,000,000 and a number-average molecular weight in a range of 3,000 to 3,000,000 such that Mw/Mn is 20.0 or less, where Mw represents the weight-average molecular weight and Mn represents the number-average molecular weight.
A pneumatic tire, comprising:
- a rubber composition comprising a branched conjugated diene copolymer prepared by copolymerizing monomers consisting of a branched conjugated diene compound and a conjugated diene compound,
- wherein a copolymerization ratio of the branched conjugated diene compound is 1 to 99% by weight, a copolymerization ratio of the conjugated diene compound is 99 to 1% by weight, the branched conjugated diene compound is farnesene, the conjugated diene compound is 1,3-butadiene, and the branched conjugated diene copolymer has a weight-average molecular weight in a range of 3,000 to 3,000,000 and a number-average molecular weight in a range of 3,000 to 3,000,000 such that Mw/Mn is 20.0 or less, where Mw represents the weight-average molecular weight and Mn represents the number-average molecular weight.
Dependencies are inferred from the claim text.