Rubber composition and pneumatic tire formed using the rubber composition

摘要

A rubber composition and a pneumatic tire formed by using the rubber composition is provided which has excellent snow and ice control and braking performance on snowy and/or icy road surface and provides a satisfactory wet skid performance. The present invention is a rubber composition and pneumatic tire formed using the rubber composition in at least the tread portion thereof, the rubber composition comprising a 100 parts by weight of rubber component comprising (1) 5 percent by weight to 50 percent by weight of low molecular weight butadiene rubber (BR) having a cis 1, 4-structure of 60 mol% to 98 mol% and a weight average molecular weight (Mw) of 5000 to 80000; and (2) 50 percent by weight to 90 percent by weight of styrene - butadiene rubber (SBR) having a bound styrene content of 15 percent by weight to 45 percent by weight and amount of a vinyl bonding in the butadiene portion of 7 mol% to 60 mol%; and 40 parts by weight to 95 parts by weight of silica.