RUBBER COMPOSITION AND PNEUMATIC TIRE USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a rubber composition which inhibits deformation and is excellent in heat aging resistance, and a pneumatic tire using the same. SOLUTION: The rubber composition comprises (A) 100 pts.wt. blend rubber comprising natural rubber (NR) and polybutadiene rubber (BR) in a weight ratio ranging from 70/30 to 30/70 and (B) (a) sulfur, (b) 0.1-3 pts.wt. cyclic polysulfide represented by formula (I) (wherein x is a number with an average of 2-6; n is an integer of 1-20; and R is an optionally substituted 2-20C alkylene group, an optionally substituted 2-20C oxyalkylene group or an aromatic group-containing alkylene group) and (c) a vulcanization accelerator in amounts satisfying the relation: 0.4≤(a+2/3×b)/c≤1.5. COPYRIGHT: (C)2006,JPO&NCIPI