Pneumatic tire with specified inner liner
AssigneeSumitomo Rubber Industries, Ltd.
InventorTakafumi Taguchi
Life of this patent
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Abstract
The present invention relates to a pneumatic tire having an inner liner formed from a rubber composition that includes a butyl rubber in which the Mooney viscosity measured at 130° C. of an unvulcanized rubber of the rubber composition is at least 45, wherein the average value and standard deviation of the butyl rubber gauge of shoulder portion of a finished tire satisfy: (Standard deviation of butyl rubber gauge)/(Average value of butyl rubber gauge)≦0.060. The rubber gauge of the tire exhibits improved uniformity and is superior in air permeability resistance.
Claims2
A pneumatic tire having an inner liner comprising a rubber composition for a pneumatic tire in which the ML1+4 Mooney viscosity measured at 130° C. of an unvulcanized rubber of the rubber composition for a pneumatic tire comprising a butyl rubber is in the range 45 to 55,
- wherein said rubber composition for a pneumatic tire comprises 4 to 6 parts by weight of a mix resin and 1.5 to 2.5 parts by weight of a phenol adhesive resin based on 100 parts by weight of a rubber component which consists of 70 to 100% by weight of a halogenated butyl rubber and 30 to 0% by weight of a natural rubber,
- wherein a butyl rubber gauge of a shoulder portion of a finished tire is 0.25 to 1.50 millimeters in thickness, and the average value and standard deviation of the butyl rubber gauge of a shoulder portion of a finished tire satisfy the relationship:
- (Standard deviation of butyl rubber gauge)/(Average value of butyl rubber gauge)≦0.060, and
- wherein said pneumatic tire is made by a process in which the unvulcanized tire including the unvulcanized inner liner is molded and vulcanized by heating and pressuring the unvulcanized tire in a vulcanizer such that the rubber flow of the inner liner during vulcanization is suppressed by controlling the Mooney viscosity (ML1+4, 130° C.) of the unvulcanized rubber to be in the range 45 to 55.
A pneumatic tire having an inner liner comprising a rubber composition for a pneumatic tire in which the ML1+4 Mooney viscosity measured at 130° C. of an unvulcanized rubber of the rubber composition for a pneumatic tire comprising a butyl rubber is in the range 45 to 55,
- wherein said rubber composition for a pneumatic tire comprises 4 to 6 parts by weight of a mix resin and 1.5 to 2.5 parts by weight of a phenol adhesive resin based on 100 parts by weight of a rubber component which consists of 60 to 100% by weight of a halogenated butyl rubber, 20 to 0% by weight of a natural rubber, and 20 to 0% by weight of a reclaimed butyl rubber, and
- wherein a butyl rubber gauge of a shoulder portion of a finished tire is 0.25 to 1.50 millimeters in thickness, and the average value and standard deviation of the butyl rubber gauge of a shoulder portion of a finished tire satisfy the relationship:
- (Standard deviation of butyl rubber gauge)/(Average value of butyl rubber gauge)≦060, and
- wherein said pneumatic tire is made by a process in which the unvulcanized tire including the unvulcanized inner liner is molded and vulcanized by heating and pressuring the unvulcanized tire in a vulcanizer such that the rubber flow of the inner liner during vulcanization is suppressed by controlling the Mooney viscosity (ML1+4, 130° C.) of the unvulcanized rubber to be in the range 45 to 55.
Dependencies are inferred from the claim text.