| 摘要 |
The rubber composition of the present invention comprises a rubber component which is a blend rubber of a copolymer rubber and other diene based rubbers or the copolymer rubber alone, the copolymer rubber having a glass transition temperature of -60° C. or higher, a styrene content of 15 to 30% by weight and a vinyl content of 40 to 70% of a butadiene portion and the blend rubber comprising 55 parts by weight or more of the copolymer rubber and 45 parts by weight or less of the other diene based rubbers in 100 parts by weight of the rubber component; 20 to 100 parts by weight of silica per 100 parts by weight of the rubber component; 0 to 100 parts by weight of carbon black per 100 parts by weight of the rubber component, a ratio by weight of the amount of the silica to the amount of the carbon black being 1:1 to 1:0; and, in an amount of 1 to 20% by weight of the amount of silica, a specific silane coupling agent which is a bis(alkoxysilylalkyl) polysulfide having a specific polysulfide structure with a specific distribution of sulfur. The obtained rubber composition has excellent workability. The pneumatic tire using this rubber composition shows improved uniformity and abrasion resistance.
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