Patent ID: 6187843
Filing Date: 2001-02-13
Classification: C08K

Abstract:
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: ##STR5##wherein each of R.sup.1 and R.sup.2 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:(R.sup.3).sub.3 Nwherein R.sup.3 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: ##STR6##wherein R.sup.4 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: ##STR7##wherein each of R.sup.5 and R.sup.6 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.