| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic tire furnished with a wing tip having excellent crack resistance, extrusion moldability and abrasion resistance. SOLUTION: The pneumatic tire has a wing tip made of a rubber composition comprising (I) a rubber component containing (a) a vinyl/cis-butadiene rubber obtained by (1) controlling the water concentration of a mixture of 1,3-butadiene and an inert organic solvent composed mainly of 4C fraction, (2) carrying out cis-1,4-polymerization of 1,3-butadiene by adding a cis-1,4-polymerization catalyst to the mixture and (3) carrying out 1,2-polymerization of 1,3-butadiene in the presence of a 1,2-polymerization catalyst in the obtained polymerization reaction mixture, (b) NR and/or IR and (c) an A-B (or A-B') block copolymer containing an IR block (A), and a poly(styrene-butadiene) block (B) or BR block (B') and (II) a specific carbon black having a particle diameter of 25-60 nm and a CTAB of 35-100 m<SP>2</SP>/g. COPYRIGHT: (C)2008,JPO&INPIT
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