Composition for tread rubber of tires
AssigneeSumitomo Rubber Industries, Ltd.
InventorNaohiko Kikuchi
Life of this patent
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Abstract
A rubber composition suitable for use in tread of tires, having excellent rolling characteristics and abrasion resistance and an improved dimensional stability as not causing shrinkage when extruded into rubber sheets for treads, which comprises a rubber component, 20 to 60 parts by weight of silica, 3 to 12 parts by weight of a silane coupling agent, and 2 to 10 parts by weight of a short fiber, respectively, per 100 parts by weight of the rubber component.
Claims16
A rubber composition suitable for tire treads comprising a rubber component consisting of a diene rubber, 20 to 60 parts of silica, 3 to 12 parts of a silane coupling agent, and 2 to 10 parts of an organic short fiber, wherein said organic short fiber has an average diameter of 0.1 to 0.5 .mu.m, an average length of 50 to 500 .mu.m and a length/diameter ratio of 100 to 5,000, said silane coupling agent is a member selected from the group consisting of a compound of the formula:
- RSiXn wherein R is an organic functional group having vinyl group, glycidoxy group, methacryloly group, amino group or mercapto group, X is a hydrolyzable group and n is 2 or 3, and bis(triethoxysilylpropyl)tetrasulfide, and said parts all being parts by weight per 100 parts by weight of said rubber component.
A rubber composition suitable for tire treads comprising a rubber component consisting of a diene rubber, 20 to 60 parts of silica, 3 to 12 parts of a silane coupling agent, 2 to 10 parts of an organic short fiber, and 0 to 25 parts by weight of carbon black having an iodine absorption number of 100 to 190 mg/g, said organic short fiber having an average diameter of 0.1 to 0.5 .mu.m, an average length of 50 to 500 .mu.m and a length/diameter ratio of 100 to 5,000, said silane coupling agent being a member selected from the group consisting of a compound of the formula:
- RSiXn wherein R is an organic functional group having vinyl group, glycidoxy group, methacryloyl group amino group or mercapto group, X is a hydrolyzable group and n is 2 or 3, and bis(triethoxysilylpropyl)tetrasulfide, and said parts all being parts by weight per 100 parts by weight of said rubber component.
A rubber composition suitable for tire treads comprising a rubber component consisting of a diene rubber,
- 20 to 60 parts of silica,
- 3 to 12 parts of a silane coupling agent which comprises bis(triethoxysilylpropyl) tetrasulfide, and
- 2to 10 parts of an organic short fiber which has an average diameter D of 0.1 to 0.5 .mu.m, an average length L of 50 to 500 .mu.m and an L/D ratio of 100 to 5,000
- said parts all being parts by weight per 100 parts by weight of said rubber component.
Dependencies are inferred from the claim text.