Rubber composition for tire and pneumatic tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorHiroki Nakajima
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide a rubber composition for tire which can improve initial grip performance and stable grip performance during running at a high level while maintaining sufficient abrasion resistance, and a pneumatic tire having a tread composed of this rubber composition for tire. The rubber composition for tire comprises 70 to 200 parts by mass of a filler and 60 to 250 parts by mass of a softener compounding 15 to 60 parts by mass of a predetermined tackifying resin with a softening point of not less than 110° C. based on 100 parts by mass of a diene rubber component comprising not less than 20% by mass of a SBRa having a glass transition temperature of −35 to 15° C., a styrene content of 35 to 48% by mass and a vinyl unit quantity in the butadiene component of 35 to 55%.
Claims8
A rubber composition for tire comprising:
- 70 to 200 parts by mass of a filler and
- 60 to 250 parts by mass of a softener compounding 15 to 60 parts by mass of a tackifying resin with a softening point of not less than 110° C.
- based on 100 parts by mass of a diene rubber component comprising not less than 20% by mass of a styrene-butadiene copolymer rubber a (SBRa) having a glass transition temperature of −35 to 15° C., a styrene content of 35 to 48% by mass and a vinyl unit quantity in the butadiene component of 35 to 55%,
- wherein the diene rubber component is a diene rubber component consisting of an SBRa and a styrene-butadiene copolymer rubber b other than SBRa (SBRb) only,
- wherein the tackifying resin is a copolymer resin of 1-methyl-4-(1-methylethenyl)-cyclohexene and/or (1S,5S)-2,6,6-trimethylbicyclo[3.1.1]-2-heptene and/or (1S,5S)-6,6-dimethyl-2-methylenebicyclo[3.1.1]heptane and aromatic vinyl, or a hydrogenated product thereof.
Dependencies are inferred from the claim text.