RUBBER COMPOSITION, AND PNEUMATIC TIRE

摘要

Provided are: a rubber composition a achieving balanced improvement in processability, fuel economy, rubber strength, abrasion resistance, wet-grip performance, and handling stability, and a pneumatic tire including the composition. Included is a rubber composition including a conjugated diene polymer and a silica having N2SA of 40-400 m2/g, the 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 of formula (I):;;to produce, a copolymer, and reacting a compound containing nitrogen and/or silicon atoms with an active terminal of the copolymer, wherein the amount of the diene polymer is 1-90% by mass and the amount of a polyisoprene-based rubber is 0-70% by mass, each per 100% by mass of the rubber component, and the amount of the silica is 10-150 parts by mass per 100 parts by mass of the rubber component.

主权项

1. A rubber composition, comprising
a conjugated diene polymer, and a silica having a nitrogen adsorption specific surface area of 40 to 400 m2/g, 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; R11 represents a C1-100 hydrocarbylene group; R12 and R13 each represent an optionally substituted hydrocarbyl group or a trihydrocarbylsilyl group, or R12 and R13 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 90% by mass and an amount of a polyisoprene-based rubber is 0 to 70% by mass, each based on 100% by mass of a rubber component of the rubber composition, and an amount of the silica is 10 to 150 parts by mass for each 100 parts by mass of the rubber component.