Rubber composition
A rubber composition, comprises a rubber component; and a completely amorphous olefin based elastomer having a glass transition temperature Ig of −40 to 20° C. in an amount of 1 to 40 parts by mass when the entire amount of the rubber component is regarded as 100 parts by mass. It is preferred that the rubber composition further comprises a liquid rubber in an amount of 1 to 40 parts by mass.
1. A rubber composition, comprising:
a rubber component; and
a completely amorphous olefin based elastomer,
wherein the rubber component is a diene rubber,
wherein the completely amorphous olefin based elastomer has a glass transition temperature Tg of −40 to 20° C. in an amount of 1 to 40 parts by mass when the entire amount of the rubber component is regarded as 100 parts by mass;
wherein the rubber composition includes terminal modified SBR in an amount of 5 to 80 parts by mass when the entire amount of the rubber component is regarded as 100 parts by mass.
2. The rubber composition according to claim 1 , further comprising a liquid rubber in an amount of 1 to 40 parts by mass when the entire amount of the rubber component is regarded as 100 parts by mass.
3. The rubber composition according to claim 1 , wherein the completely amorphous olefin based elastomer is a polyolefin having recurring units selected from the group consisting of ethylene, propylene, butylene, 1-pentene, 4-methylpentene, 1-hexene and 1-octene.
4. The rubber composition according to claim 1 , wherein the glass transition temperature Tg of the completely amorphous olefin based elastomer is −20 to 10° C.
5. The rubber composition according to claim 1 , wherein the amount of the completely amorphous olefin based elastomer is 1 to 25 parts by mass when the entire amount of the rubber component is regarded as 100 parts by mass.