Tire
AssigneeSumitomo Rubber Industries, Ltd.
InventorShuichiro Ono
Life of this patent
Estimating the term…
Abstract
A tire including a tread portion, the tread portion having at least one main groove continuously extending in the tire circumferential direction, the tread portion including a rubber having a hardness at 60° C. of 58 or higher and a hardness at 0° C. of not more than 115% of the hardness at 60° C., the tread portion having a S50/S0 ratio of more than 1, wherein S0 denotes the sea proportion (%) in the tread ground contact surface of the new tire, and S50 denotes the sea proportion (%) when the tread portion is worn until the depth of the main groove reaches 50% of that of the new tire.
Claims17
A tire, comprising a tread portion,
- the tread portion having at least one main groove continuously extending in a tire circumferential direction,
- the tread portion comprising a rubber having a hardness at 60° C. of 58 or higher and a hardness at 0° C. of not more than 105% of the hardness at 60° C.,
- the tread portion having a S50/S0 ratio of more than 1, wherein S0 denotes a sea proportion (%) in a tread ground contact surface of the new tire, and S50 denotes a sea proportion (%) when the tread portion is worn until a depth of the main groove reaches 50% of that of the new tire,
- wherein the rubber included in the tread portion comprises a polymer composite in which a group that changes its hydrophilicity with changes in temperature is bound to a conjugated diene polymer, and a solid resin of 5 parts by mass or more per 100 parts by mass of a rubber component content, and
- wherein the group that changes its hydrophilicity with changes in temperature shows a lower critical solution temperature (LCST) in water.
A tire, comprising a tread portion,
- the tread portion having at least one main groove continuously extending in a tire circumferential direction,
- the tread portion comprising a rubber having a hardness at 60° C. of 58 or higher and a hardness at 0° C. of not more than 105% of the hardness at 60° C.,
- the tread portion having a S50/S0 ratio of more than 1, wherein S0 denotes a sea proportion (%) in a tread ground contact surface of the new tire, and S50 denotes a sea proportion (%) when the tread portion is worn until a depth of the main groove reaches 50% of that of the new tire,
- wherein the rubber included in the tread portion comprises a solid resin of 5 parts by mass or more per 100 parts by mass of a rubber component content,
- wherein the rubber included in the tread portion comprises a polymer composite in which a group that changes its hydrophilicity with changes in temperature is bound to a conjugated diene polymer,
- wherein the conjugated diene polymer has weight average molecular weight (Mw) as determined by gel permeation chromatography of 300,000 or more, and
- wherein the group that changes its hydrophilicity with changes in temperature shows a lower critical solution temperature (LCST) in water.
Dependencies are inferred from the claim text.