Rubber composition for tire treads
View Patent ↗A rubber composition contains: a diene rubber; 1 to 25 parts by weight of aromatic modified terpene resin; 80 to 150 parts by weight of silica; 5 to 50 parts by weight of carbon black; an oil component; and 0.1 to 20 wt. % of the weight of the silica of alkyltriethoxysilane having an alkyl group having 3 to 20 carbons, the diene rubber containing 10 to 30 wt. % of natural rubber, 10 to 30 wt. % of solution polymerized styrene butadiene rubber having a styrene unit content of 30 to 40 wt. % and 80 to 40 wt. % of emulsion polymerized styrene butadiene rubber, and a ratio of a total amount of an oil-extending component in the solution polymerized styrene butadiene rubber and/or the emulsion polymerized styrene butadiene rubber, the aromatic modified terpene resin, and the oil component to a weight of the natural rubber being 3.0 to 4.0.
1. A rubber composition for tire treads comprising:
a diene rubber;
from 1 to 25 parts by weight of an aromatic modified terpene resin;
from 80 to 150 parts by weight of a silica;
from 5 to 50 parts by weight of a carbon black;
an oil component, per 100 parts by weight of the diene rubber; and
from 0.1 to 20 wt. % of the weight of the silica of an alkyltriethoxysilane having an alkyl group having from 3 to 20 carbons,
the diene rubber containing from 10 to 30 wt. % of a natural rubber, from 10 to 30 wt. % of a solution polymerized styrene butadiene rubber having a styrene unit content of 30 to 40 wt. %, and from 80 to 40 wt. % of an emulsion polymerized styrene butadiene rubber, and
a ratio of a total amount W oil of an oil-extending component contained in the solution polymerized styrene butadiene rubber and/or the emulsion polymerized styrene butadiene rubber, the aromatic modified terpene resin, and the oil component to a weight W NR of the natural rubber (W oil /W NR ) being from 3.0 to 4.0.
2. The rubber composition for tire treads according to claim 1 , wherein a CTAB specific surface area of the silica is from 180 to 250 m 2 /g.
3. The rubber composition for tire treads according to claim 1 , wherein a total compounded amount of the silica and the carbon black is greater than 140 parts by weight and 200 parts by weight or less.
4. A pneumatic tire comprising the rubber composition for tire treads according to claim 1 .
5. The rubber composition for tire treads according to claim 2 , wherein a total compounded amount of the silica and the carbon black is greater than 140 parts by weight and 200 parts by weight or less.