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.
Claims13
A branched conjugated diene copolymer prepared by copolymerizing a branched conjugated diene compound represented by formula (1):
- wherein R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, and
- a conjugated diene compound represented by formula (2):
- wherein R2 and R3 are the same or different and each is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms or a halogen atom,
- wherein a copolymerization ratio (l) of the branched conjugated diene compound (1) is 1 to 99% by weight, and a copolymerization ratio (m) of the conjugated diene compound (2) is 99 to 1% by weight, and the branched conjugated diene compound (1) is farnesene, or myrcene and farnesene.
5-7. (canceled)
A rubber composition comprising a branched conjugated diene copolymer prepared by copolymerizing a branched conjugated diene compound represented by formula (1):
- wherein R1 is an aliphatic hydrocarbon having 6 to 11 carbon atoms, and
- a conjugated diene compound represented by formula (2):
- wherein R2 and R3 are the same or different and each is a hydrogen atom, an aliphatic hydrocarbon group having 1 to 3 carbon atoms or a halogen atom,
- wherein a copolymerization ratio (l) of the branched conjugated diene compound (1) is 1 to 99% by weight, and a copolymerization ratio (m) of the conjugated diene compound (2) is 99 to 1% by weight.
Dependencies are inferred from the claim text.