Rubber composition for sidewall or rim strip of tire, and pneumatic tire
AssigneeToyo Tire & Rubber Co., Ltd.
InventorShinsaku Kamada
Life of this patent
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Abstract
A rubber composition for a sidewall or rim strip of a tire comprises a diene rubber, a hydrocarbon type wax in which the difference (Tm3−Tm1) between a starting point (Tm1) and an end point (Tm3) of a heat absorption peak measured by a differential scanning calorimeter is 40° C. or less, and a processing aid comprising at least one selected from the group consisting of a fatty acid metal salt, a fatty acid amide and a fatty acid ester, in which the difference (Tm3−Tm1) between a starting point (Tm1) and an end point (Tm3) of a heat absorption peak measured by the differential scanning calorimeter is 50° C. or more. The rubber composition can suppress discoloration of a rubber surface due to a wax.
Claims9
A rubber composition for a sidewall or rim strip of a tire, comprising:
- a diene rubber,
- a hydrocarbon wax in which the difference (Tm3−Tm1) between a starting point (Tm1) and an end point (Tm3) of a heat absorption peak measured by a differential scanning calorimeter is 40° C. or less, and
- a processing aid comprising at least one selected from the group consisting of a fatty acid metal salt, a fatty acid amide, and a fatty acid ester, in which the difference (Tm3−Tm1) between a starting point (Tm1) and an end point (Tm3) of a heat absorption peak measured by the differential scanning calorimeter is 50° C. or more.
Dependencies are inferred from the claim text.