| 摘要 |
Provided are a rubber composition achieving balanced improvement in processability, fuel economy, rubber strength, abrasion resistance, and wet-grip performance, and a pneumatic tire thereof. The rubber composition includes a conjugated diene polymer and a silica having N2SA of 40-400 m2/g, the 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 1-60% by mass and the amount of polyisoprene-based rubber is 0-99% by mass, each per 100% by mass of the rubber component; the amount of the silica is 10-80 parts by mass per 100 parts by mass of the rubber component; and the composition has a carbon ratio of at least 50. |
| 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 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 not less than 50. |
