| 摘要 |
The present invention addresses the problem of providing a rubber composition that has favorable workability while maintaining favorable heat-generation reduction effects. The present invention also addresses the problem of providing a pneumatic tire that uses the rubber composition. This rubber composition contains a diene rubber that includes 5-70 mass% of a modified butadiene rubber that is obtained by using a nitrone compound (B) that has a carboxy group to modify an unmodified butadiene rubber (A). The unmodified butadiene rubber (A) has 1.5-60 mol% vinyl bonds and includes 2-45 parts by mass of an unmodified low-molecular-weight butadiene rubber (A1) that has a number average molecular weight (Mn) of 2000-60000 per 100 parts by mass of an unmodified butadiene rubber (A2) that has a larger number average molecular weight (Mn) than the unmodified low-molecular-weight butadiene rubber (A1). |
