Rubber composition for sidewall and tire
View Patent ↗A rubber composition for sidewall contains 10 to 40 mass % syndiotactic-1,2-polybutadiene-containing polybutadiene rubber and 10 to 30 mass % tin-modified polybytadiene rubber in a polymer component, and contains 10 to 40 parts by mass silica with respect to 100 parts by mass polymer component. Thus, cut resistance and ozone resistance as well as fuel efficiency of a car can be improved.
1. A rubber composition for sidewall, comprising:
10 to 40 mass % syndiotactic-1,2-polybutadiene-containing polybutadiene rubber and 10 to 30 mass % tin-modified polybutadiene rubber and 40 to 60 mass % natural rubber in a polymer component; and
10 to 40 parts by mass silica with respect to 100 parts by mass said polymer component.
2. The rubber composition for sidewall according to claim 1 , containing 0.5 to 3 parts by mass silane coupling agent with respect to 100 parts by mass said silica.
3. A tire manufactured with the rubber composition for sidewall according to claim 1 .
4. A tire manufactured with the rubber composition for sidewall according to claim 2 .
5. A tire having a sidewall formed from the rubber composition according to claim 1 .
6. A tire having a sidewall formed from the rubber composition according to claim 2 .