Rubber composition for use in tire treads
AssigneeThe Yokohama Rubber Co., Ltd.
InventorYusuke Iizuka
Life of this patent
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Abstract
A rubber composition comprises: per 100 parts by weight of a diene-based rubber, from 70 to 95 parts by weight of an inorganic filler containing two types of silicas, a silica X and a silica Y, and a carbon black. A compounded amount of the silica X is x parts by weight and a compounded amount of the silica Y is y parts by weight. A total amount of the silica X and the silica Y (x+y) is 85% by weight or greater of the inorganic filler, and a weight ratio of the silica X to the silica Y (x/y) is from 1/3 to 2/1. A nitrogen adsorption specific surface area of the silica X is 160 m2/g±10%, and a nitrogen adsorption specific surface area of the silica Y is 200 m2/g±10%.
Claims11
A rubber composition for use in tire treads, the rubber composition comprising:
- per 100 parts by weight of a diene-based rubber containing 80 to 90% by weight of a terminal-modified solution-polymerized styrene-butadiene rubber and from 10 to 20% by weight of a natural rubber, from 75 to 95 parts by weight of an inorganic filler containing two types of silicas, a silica X and a silica Y, and a carbon black;
- where a compounded amount of the silica X is taken to be x parts by weight and a compounded amount of the silica Y is taken to be y parts by weight,
- a total amount of the silica X and the silica Y (x+y) being 85% by weight or greater of the inorganic filler, and the total amount of the silica X and the silica Y (x+y) being 70 to 90.25 parts by weight per 100 parts by weight of the diene-based rubber, and a weight ratio of the silica X to the silica Y (x/y) being from 1/2 to 2/1;
- a nitrogen adsorption specific surface area of the silica X being in a range of 150 to 170 m2/g, and a nitrogen adsorption specific surface area of the silica Y being in a range of 200 to 215 m2/g;
- and
- the terminal-modified solution-polymerized styrene-butadiene rubber having a functional group selected from the group consisting of:
- a hydroxyl group-containing polyorganosiloxane structure and a hydroxyl group.
A rubber composition for use in tire treads, the rubber composition comprising:
- per 100 parts by weight of a diene-based rubber containing 55 to 90% by weight of a terminal-modified solution-polymerized styrene-butadiene rubber and from 10 to 20% by weight of a natural rubber, from 70 to 95 parts by weight of an inorganic filler containing two types of silicas, a silica X and a silica Y, and a carbon black;
- where a compounded amount of the silica X is taken to be x parts by weight and a compounded amount of the silica Y is taken to be y parts by weight,
- a total amount of the silica X and the silica Y (x+y) being 85% by weight or greater of the inorganic filler, and a weight ratio of the silica X to the silica Y (x/y) being from 1/2 to 2/1;
- a nitrogen adsorption specific surface area of the silica X being in a range of 150 to 175 m2/g, and a nitrogen adsorption specific surface area of the silica Y being in a range of 185 to 215 m2/g;
- the rubber composition further comprising an alkyltriethoxysilane having an alkyl group having from 7 to 20 carbons in an amount of 0.1 to 20% by weight of the total amount of the silicas (x+y);
- and
- the terminal-modified solution-polymerized styrene-butadiene rubber having a functional group selected from the group consisting of:
- a hydroxyl group-containing polyorganosiloxane structure and a hydroxyl group.
A rubber composition for use in tire treads, the rubber composition comprising:
- per 100 parts by weight of a diene-based rubber containing 55 to 90% by weight of a terminal-modified solution-polymerized styrene-butadiene rubber and from 10 to 20% by weight of a natural rubber, from 70 to 95 parts by weight of an inorganic filler containing two types of silicas, a silica X and a silica Y, and a carbon black;
- where a compounded amount of the silica X is taken to be x parts by weight and a compounded amount of the silica Y is taken to be y parts by weight,
- a total amount of the silica X and the silica Y (x+y) being 85% by weight or greater of the inorganic filler, and a weight ratio of the silica X to the silica Y (x/y) being from 1/2 to 2/1;
- and
- a nitrogen adsorption specific surface area of the silica X being in a range of 165 to 175 m2/g, and a nitrogen adsorption specific surface area of the silica Y being in a range of 185 to 194 m2/g;
- and
- the terminal-modified solution-polymerized styrene-butadiene rubber having a functional group selected from the group consisting of:
- a hydroxyl group-containing polyorganosiloxane structure and a hydroxyl group.
Dependencies are inferred from the claim text.