Rubber composition for tread and tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorsYumi Suzuki, Takeo Nakazono
Life of this patent
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Abstract
The rubber composition for a tread comprises: 5 to 30 parts by mass of a carbon black, 95 parts by mass or more of silica, 25 parts by mass or more of a powder of an inorganic compound represented by a given formula (A) and having an average primary particle size of 10 μm or less, and 70 parts by mass or more of a softening agent comprising 2 to 15 parts by mass of a coumarone-based resin, based on 100 parts by mass of a rubber component comprising 70% by mass or more of a styrene-butadiene rubber having a styrene content of from 20 to 50% by mass and a vinyl content of from 15 to 65%, and the tire has a tread composed of the rubber composition for a tread.
Claims13
A rubber composition for a tread comprising:
- 5 to 20 parts by mass of a carbon black,
- 95 parts by mass or more of silica,
- wherein a nitrogen adsorption specific surface area of the silica is 40 to 500 m2/g,
- 35 parts by mass to 50 parts by mass of a powder of an inorganic compound represented by the following formula (A) and having an average primary particle size of 10 μm or less, and
- 70 parts by mass or more of a softening agent comprising 2 to 15 parts by mass of a coumarone-based resin,
- based on 100 parts by mass of a rubber component comprising 70% by mass or more of a styrene-butadiene rubber having a styrene content of from 20 to 50% by mass and a vinyl content of from 15 to 65%,
- M.αSiO2.βH2O (A)
- wherein in formula (A), M is an oxide or hydroxide of at least one metal selected from Al, Mg, Ti and Ca, and each of α and β is an integer of from 0 to 10, and
- wherein the coumarone-based resin is an only resin of the rubber composition.
A rubber composition for a tread comprising:
- 5 to 30 parts by mass of a carbon black,
- not less than 120 parts by mass or more of silica,
- wherein a nitrogen adsorption specific surface area of the silica is 40 to 500 m2/g,
- 25 parts by mass or more of a powder of an inorganic compound represented by the following formula (A) and having an average primary particle size of 10 μm or less, and
- 70 parts by mass or more of a softening agent comprising 2 to 15 parts by mass of a coumarone-based resin,
- based on 100 parts by mass of a rubber component comprising 70% by mass or more of a styrene-butadiene rubber having a styrene content of from 20 to 50% by mass and a vinyl content of from 15 to 65%,
- M.αSiO2.βH2O (A)
- wherein in formula (A), M is an oxide or hydroxide of at least one metal selected from Al, Mg, Ti and Ca, and each of α and β is an integer of from 0 to 10, and
- wherein the coumarone-based resin is an only resin of the rubber composition.
A rubber composition for a tread comprising:
- 5 to 20 parts by mass of a carbon black,
- 120 to 200 parts by mass of silica,
- 35 to 50 parts by mass of a powder of an inorganic compound represented by the following formula (A) and having an average primary particle size of 10 μm or less, and
- 70 parts by mass or more of a softening agent comprising 2 to 15 parts by mass of a coumarone-based resin,
- based on 100 parts by mass of a rubber component comprising 70% by mass or more of a styrene-butadiene rubber having a styrene content of from 20 to 50% by mass and a vinyl content of from 15 to 65%,
- M.αSiO2.βH2O (A)
- wherein in formula (A), M is an oxide or hydroxide of at least one metal selected from Al, Mg, Ti and Ca, and each of α and β is an integer of from 0 to 10.
Dependencies are inferred from the claim text.