RUBBER COMPOSITION FOR TIRE

摘要

PROBLEM TO BE SOLVED: To stabilize quality of a tire in improving a tire performance on ice by blending a dien-rubber with a thermally expansible capsule or thermally expandable graphite. SOLUTION: This rubber composition for a tire tread comprises 2 to 50 pts.wt. precipitated silica, 1 to 25 pts.wt. thermally expansible micro-capsule or 1 to 20 pts.wt. thermally expansible micro-capsule and thermally expandable graphite, and 0.1 to 10 pts.wt. polysiloxane compound having number-average molecular weight of 200 to 100,000 and repeating units expressed by the formula (I) (where R<1> represents methyl, ethyl or phenyl; R<2> represents hydrogen or an organic group; R<3> represents an alkyl or an acyl group; m is an integer of 0 or 1 or more; and n is an integer of 1 or more) blended simultaneously to 100 pts.wt. of a dien-rubber.