Patent ID: 9120890
Filing Date: 2015-09-01
Classification: B60C,C08C,C08F,C08K,C08L,Y02T

Abstract:
1. A rubber composition, comprising a conjugated diene polymer, and a silica having a nitrogen adsorption specific surface area of 40 to 400 m the conjugated diene polymer being obtained by polymerizing a monomer component including a conjugated diene compound and a silicon-containing vinyl compound in the presence of a polymerization initiator represented by the following formula (I): wherein i represents 0 or 1; R 11 represents a C 1-100 hydrocarbylene group; R 12 and R 13 each represent an optionally substituted hydrocarbyl group or a trihydrocarbylsilyl group, or R 12 and R 13 are bonded to each other to form a hydrocarbylene group optionally containing at least one, as a hetero atom, selected from the group consisting of a silicon atom, a nitrogen atom, and an oxygen atom; and M represents an alkali metal atom, to produce a copolymer, and then reacting a compound containing at least one of a nitrogen atom and a silicon atom with an active terminal of the copolymer, wherein an amount of the conjugated diene polymer is 1 to 60% by mass and an amount of a polyisoprene-based rubber is 0 to 99% by mass, each based on 100% by mass of a rubber component of the rubber composition, an amount of the silica is 10 to 80 parts by mass for each 100 parts by mass of the rubber component, and the rubber composition has a carbon ratio of more than 50.