Rubber composition and pneumatic tire
AssigneeBridgestone Corporation
InventorNao Kawakami
Life of this patent
Estimating the term…
Abstract
Provided are a pneumatic tire in which balance between dry steering stability and low rolling resistance is improved while excellent on-ice performance and wet grip performance are maintained, and a rubber composition from which the tire is obtained. The rubber composition contains a rubber component containing a natural rubber and a modified styrene-butadiene copolymer rubber having a glass transition temperature of −50° C. or lower, a resin, a filler containing silica having a cetyltrimethylammonium bromide specific surface area of 190 m2/g or more, and an oil component. A content of the modified styrene-butadiene copolymer rubber in the rubber component is more than 50% by mass.
Claims9
A rubber composition comprising:
- a rubber component comprising a natural rubber and a modified styrene-butadiene copolymer rubber having a glass transition temperature of −50° C. or lower;
- a resin;
- a filler comprising silica having a cetyltrimethylammonium bromide specific surface area of 190 m2/g or more;
- and
- an oil component, wherein
- a content of the modified styrene-butadiene copolymer rubber in the rubber component is more than 50% by mass,
- the filler comprises aluminum hydroxide,
- a ratio (s/a) of a content(s) of the silica to a content (a) of the aluminum hydroxide is 5 to 10 on a mass basis,
- the content of the silica having a cetyltrimethylammonium bromide specific surface area of 190 m2/g or more is 100% by mass in a total amount of all silica, and
- the rubber component further comprises 1% to 30% by mass of a modified styrene-butadiene copolymer rubber having a glass transition temperature of −40° C. or higher.
Dependencies are inferred from the claim text.