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US 6,187,843 B1Granted
Rubber compositions for tire tread developing excellent gripping performance
AssigneeBridgestone Corporation
InventorsDaisuke Nohara, Kazuya Hatakeyama
Life of this patent
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Abstract
A rubber composition for use in a tread of a pneumatic tire comprises particular amounts of particular nitrogen-containing compound and particular proton acid or derivative thereof based on 100 parts by weight of rubber ingredient, and develops an excellent gripping performance.
Claims7
A rubber composition for use in a tire tread developing an excellent gripping performance, comprising 0.1-50 parts by weight of at least one nitrogen-containing compound selected from the group consisting of the following compounds (1)-(4):
- (1) a lactam having of 4-19 carbon atoms in a heterocyclic ring and represented by the following formula:
- wherein each of R1 and R2 is a straight or branched chain alkyl group having 1-8 carbon atoms, a hydrogen atom, a phenyl group, or a phenyl group substituted with an alkyl group having 1-8 carbon atoms and they are the same or different;
- (2) a tertiary amine represented by the following formula:
- (R3)3N
- wherein R3 is a straight or branched chain alkyl group having 1-8 carbon atoms, a phenyl group, or a phenyl group substituted with an alkyl group having 1-8 carbon atoms;
- (3) an isoquinoline represented by the following formula:
- wherein R4 is a straight or branched chain alkyl group having 1-8 carbon atoms, a hydrogen atom, a phenyl group, or a phenyl group substituted with an alkyl group having 1-8 carbon atoms;
- and
- (4) a cyclic dipeptide represented by the following formula:
- wherein each of R5 and R6 is a straight or branched chain alkyl group having 1-8 carbon atoms, a hydrogen atom, a phenyl group, or a phenyl group substituted with an alkyl group having 1-8 carbon atoms and they are the same or different;
- and 0.1-50 parts by weight of at least one compound selected from the group consisting of proton acid compounds, based on 100 parts by weight of rubber ingredient consisting of natural rubber and/or synthetic rubber;
- wherein said proton acid compounds are selected from the group consisting of acetic acid, succinic acid, oleic acid, resin acid, maleic acid, benzoic acid, p-methoxybenzoic acid, p-chlorobenzoic acid, p-nitrobenzoic acid, cinnamic acid, d-naphthylcarboxylic acid, phthalic acid, trimellitic acid, pyromellitic acid, anhydrous phthalic acid, naphthoic acid and bisphenolics thereof.
9 more elements
Dependencies are inferred from the claim text.