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US 5,705,549 AGranted
Rubber compositions
AssigneeBridgestone Corporation
InventorMasahiro Hojo
Life of this patent
Estimating the term…
Abstract
A rubber composition comprises a particular copolymer containing isobutylene unit, a paramethylstyrene unit and a parabromomethylstyrene unit; natural rubber and/or diene synthetic rubber; carbon black; and at least one hydrazide compound, and has a low value of tan .delta. at 60.degree. C. with maintaining tan .delta. at 0.degree. C. at a high level.
Claims6
A rubber composition comprising (1) 10-50 parts by weight of a copolymer containing isobutylene unit, a paramethylstyrene unit and a parabromomethylstyrene unit;
- (2) (100-Q) parts by weight of natural rubber and/or diene synthetic rubber when the amount of the copolymer of the above item (1) is Q;
- (3) 20-150 parts by weight of carbon black;
- and (4) 0.1-5.0 parts by weight of at least one hydrazide compound represented by the following general formulae (I), (II) and (III):
- ##STR11## wherein A is a bivalent group obtained from an aromatic ring, a substituted or nonsubstituted hydantoin ring, or a saturated or unsaturated straight-chain hydrocarbon having a carbon number of 1-18, B is a bivalent aromatic hydrocarbon group, X is a hydroxyl group or an amino group, and Y is a pyridyl group or a hydrazino group.
1 more element
Dependencies are inferred from the claim text.