| abstract |
PROBLEM TO BE SOLVED: To provide a rubber composition for a breaker excellent in balance among rigidity, heat resistance, adhesiveness, wet heat adhesiveness, elongation performance and the like, and air having a breaker layer or a belt layer made of the rubber composition. Provide tires with tires. SOLUTION: 55 to 6 parts by weight per 100 parts by weight of a rubber component mainly composed of natural rubber and / or isoprene rubber. Rubber composition for breaker comprising 5 parts by weight of carbon black, 5 to 15 parts by weight of silica, 3.5 to 4.5 parts by weight of sulfur, 0.08 parts by weight or more of cobalt, resorcinol resin and methylene donor And a pneumatic tire using the rubber composition for a breaker layer or a belt layer. |