| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber composition suitable for being used for a rim cushion of a pneumatic tire improving a hardness, a wearing-resistance property, an anti-bending cracking property and a processability. SOLUTION: In the pneumatic tire, a rubber composition comprising (A) 100 pts.wt. of a rubber composition containing 5-100 pts.wt. of a vinyl-cis-polybutadiene rubber obtained by (1) adjusting a concentration of a moisture content of a mixture of 1,3-butadiene and an inert organic solvent mainly containing a C<SB>4</SB>fraction, (2) then, adding a catalyst of cis-1,4-polymerization to the mixture to cis-1,4-polymerizing the 1,3-butadiene, (3) then, 1,2-polymerizing 1,3-butadiene in the obtained polymerization reaction mixture in the presence of the 1,2-polymerization catalyst, and (B) 70-90 pts.wt. of carbon black is used for the rim cushion. COPYRIGHT: (C)2008,JPO&INPIT
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