| 摘要 |
PROBLEM TO BE SOLVED: To provide a rubber composition for a pneumatic tire capable of improving workability during rubber processing and lowering fuel consumption without losing friction-resistance and road surface gripping properties. SOLUTION: The rubber composition is obtained by incorporating silica and carbon black into a rubber component at the following ratio. For 100 pts. wt. of the rubber composition comprising≥50 wt.% of styrene-butadiene copolymer rubber having a glass transition point≥-70°C, a styrene content of 10-30 wt.%, and a vinyl content in butadiene part of 40-70 wt.%; 20-100 pts.wt. of silica having CTAB specific surface area 100-140 m<SP>2</SP>/g, and carbon black 0-100 pts.wt. are blended at the ratio of silica/carbon black=0.7/1-1/0. And a silane coupling agent having a formula; (C<SB>n</SB>H<SB>2n+1</SB>O)<SB>3</SB>Si-C<SB>m</SB>H<SB>2m</SB>-S-CO-C<SB>k</SB>H<SB>2k+1</SB>in an amount of 2-25 pts.wt. is incorporated into 100 pts.wt. of silica. In the formula, n represents a 1-3 integer, m represents a 1-5 integer and k represents a 5-9 integer. COPYRIGHT: (C)2006,JPO&NCIPI
|
