Rubber composition for tire tread and tire
AssigneeToyo Tire Corporation
InventorYasuhiro Hishikawa
Life of this patent
Estimating the term…
Abstract
A rubber composition for a tire tread according to an embodiment includes, per 100 parts by mass of a diene rubber including 30 to 85 parts by mass of a styrene butadiene rubber and 15 to 70 parts by mass of a butadiene rubber and having an average glass transition temperature of −57° C. or less: 90 to 150 parts by mass of silica; 5 to 30 parts by mass of an oil; and 10 parts by mass or more and less than 40 parts by mass of a thermoplastic resin having a softening point of 40° C. or more. In the rubber composition, the total content of the oil and the thermoplastic resin is less than 45 parts by mass, and the oil content is less than 20 parts by mass per 100 parts by mass of silica.
Claims18
A rubber composition for a tire tread, comprising, per 100 parts by mass of a diene rubber including 30 to 85 parts by mass of a styrene butadiene rubber and 15 to 70 parts by mass of a butadiene rubber and having an average glass transition temperature of −57° C. or less,
- 90 to 150 parts by mass of silica;
- 5 to 30 parts by mass of an oil;
- and
- 10 parts by mass or more and less than 40 parts by mass of a thermoplastic resin having a softening point of 40° C. or more, wherein
- the total content of the oil and the thermoplastic resin is less than 45 parts by mass, and the content of the oil is 20 parts by mass or less per 100 parts by mass of the silica.
A rubber composition for a tire tread, comprising, per 100 parts by mass of a diene rubber including 30 to 85 parts by mass of a styrene butadiene rubber and 15 to 70 parts by mass of a butadiene rubber and having an average glass transition temperature of −57° C. or less,
- 90 to 150 parts by mass of silica;
- 5 to 30 parts by mass of an oil;
- and
- 10 parts by mass or more and less than 40 parts by mass of a thermoplastic resin having a softening point of 40° C. or more, wherein
- the total content of the oil and the thermoplastic resin is less than 45 parts by mass, and the content of the oil is 20 parts by mass or less per 100 parts by mass of the silica,
- wherein 100 parts by mass of the diene rubber includes:
- as the styrene butadiene rubber, 40 to 70 parts by mass of a modified solution-polymerized styrene butadiene rubber having a glass transition temperature of −75 to −45° C. and 10 to 30 parts by mass of an unmodified styrene butadiene rubber having a glass transition temperature of −80 to −50° C.;
- and
- 15 to 40 parts by mass of the butadiene rubber.
A rubber composition for a tire tread, comprising, per 100 parts by mass of a diene rubber including 30 to 85 parts by mass of a styrene butadiene rubber and 15 to 70 parts by mass of a butadiene rubber and having an average glass transition temperature of −57° C. or less,
- 90 to 150 parts by mass of silica;
- 5 to 30 parts by mass of an oil;
- and
- 10 parts by mass or more and less than 40 parts by mass of a thermoplastic resin having a softening point of 40° C. or more, wherein
- the total content of the oil and the thermoplastic resin is less than 45 parts by mass, and the content of the oil is 20 parts by mass or less per 100 parts by mass of the silica, wherein 100 parts by mass of the diene rubber includes:
- as the styrene butadiene rubber, 15 to 45 parts by mass of a modified solution-polymerized styrene butadiene rubber having a glass transition temperature of −40 to ˜10° C. and 35 to 65 parts by mass of a modified solution-polymerized styrene butadiene rubber having a glass transition temperature of −75 to −45° C.;
- and
- 15 to 35 parts by mass of the butadiene rubber.
Dependencies are inferred from the claim text.