Patent ID: 6765045
Filing Date: 2004-07-20
Classification: B60C,C08K,C08L,Y10T

Abstract:
A rubber composition vulcanizable with sulfur which comprisesa) at least one polymer selected from the group consisting of diene polymers, olefin/monomeric diene copolymers and halogenated isoolefin/para-alkylstyrene copolymers; b) silica or mixture of silicas as filler; c) at least one agent promoting linking between the silica and the polymer, said agent having the formula Z1â€”R1â€”Snâ€”R2â€”Z2â€ƒâ€ƒ(I) whereinn is an integer between 2 and 8, R1 and R2, which may be the same or different, are each selected from among substituted or unsubstituted alkylene groups having 1 to 18 carbon atoms and of substituted or unsubstituted arylene groups having 6 to 12 carbon atoms, Z1 and Z2, which may be the same or different, each represents a group wherein R3, R4 and R5, which may be the same or different, are each selected from among alkyl groups having 1 to 4 carbon atoms, phenyl groups, alkoxy groups having 1 to 8 carbon atoms, and cycloalkoxy groups having 5 to 8 carbon atoms, with the proviso that at least one of R3, R4 and R5 is an alkoxy or cycloalkoxy; andd) at least one guanidine substituted by at least two groups, which may be the same or different, and each selected from among alkyl, aryl or aralkyl groups; wherein the composition satisfies at least one of the following features (i) and/or (ii): (i) the composition comprises at least one diene polymer which has at least one amino terminal group of an aliphatic or cycloaliphatic amine which is bonded thereto at the end of the chain, the polymer then being devoid of alkoxysilane and silanol group; and (ii) the composition comprises at least one free aliphatic or cycloaliphatic amine.