RUBBER COMPOSITION AND PNEUMATIC TIRE USING SAME

摘要

The purpose of the present invention is to provide: a rubber composition which has excellent workability, while maintaining excellently low heat generation properties even if the content of a silane coupling agent is decreased; and a pneumatic tire which uses this rubber composition. The present invention provides a rubber composition which contains a diene rubber, silica, a silane coupling agent and a liquid acid-modified polyolefin that has a weight average molecular weight of 20,000 or less and is in a liquid state at 23°C, and wherein: the content of the silica is 1-150 parts by mass relative to 100 parts by mass of the diene rubber: the content of the silane coupling agent is 1 part by mass or more relative to 100 parts by mass of the silica; the content of the liquid acid-modified polyolefin is 1 part by mass or more relative to 100 parts by mass of the diene rubber; and the total content of the silane coupling agent and the liquid acid-modified polyolefin is 3-30 parts by mass relative to 100 parts by mass of the diene rubber. The present invention also provides a pneumatic tire which uses this rubber composition.