Pneumatic tires having improved durability
AssigneeBridgestone Tire Company Limited
InventorsNoboru Yamazaki, Michio Okuyama, Seisuke Tomita
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Abstract
A steel cord futed pneumatic tire having improved durability is disclosed. In this tire, a coating rubber for the belt and/or carcass ply comprises a rubber composition containing 2 to 10 parts by weight of a polysulfide polymer having the following general formula (I): --(R--S.sub.x).sub.n, (I) wherein x is 3-6, R is --(CH.sub.2 --CH.sub.2 --O).sub.m CH.sub.2 --CH.sub.2 --, m is 3-5 and n is 10-300, as a vulcanizing agent based on 100 parts by weight of rubber hydrocarbon consisting of at least 30% by weight of natural rubber or synthetic polyisoprene rubber or blends thereof.
Claims2
A steel cord belted radial pneumatic tire having improved durability, comprising steel cords and a rubber composition comprising a polysulfide polymer, having a polyether bond therein, of the general formula I:
- --R--S.sub.x).sub.n, (I)
- wherein
- x is 3 to 6, R is --CH.sub.2 --CH.sub.2 --O).sub.m --CH.sub.2, m is 3 to 5 and n is 10 to 300,
- in an amount, an sulfur equivalent, of 2.0 to 10 parts by weight per 100 parts by weight of a rubber hydrocarbon consisting of at least 30% by weight of rubber selected from the group consisting of natural rubber, synthetic polyisoprene rubber and blends thereof, used as a coating rubber for the belt and/or carcass ply.
Dependencies are inferred from the claim text.