| abstract |
Provided is a rubber composition capable of achieving high elasticity while suppressing a significant decrease in tensile elongation and ensuring workability. The glass transition temperature is 130 ° C. or less with respect to 100 parts by mass of a low-polar diene rubber (natural rubber, polybutadiene rubber, styrene butadiene rubber, etc.) whose SP value (MPa) 1/2 is less than 17.2. In addition, it contains 0.5 to 40 parts by mass of a thermoplastic polyester resin having an SP value of 20.0 or more, a high polarity having an SP value of 17.2 or more and less than 20.0, and a number average molecular weight of 50,000 or more. It is a rubber composition containing 2-30% by mass of diene rubber (nitrile rubber, epoxidized natural rubber, etc.) with respect to the thermoplastic polyester resin. [Selection figure] None |