Patent ID: 6136913
Filing Date: 2000-10-24
Classification: B29B,C08J,C08K,Y02T

Abstract:
Process for producing a vulcanizable rubber composition with a silica-based reinforcing filler, characterized in that it comprises the steps of:throughly mixing, at a temperature of from 165.degree. to 180.degree. C. and in substantial absence of silica coupling agents, a cross-linkable unsaturated chain polymer base, at least a silica-based reinforcing filler and optionally one or more non cross-linking ingredients;adding to the rubber composition thus obtained at least a silane-based silica coupling agent and optionally a second portion of said silica-based reinforcing filler;submitting to intimate mixing the resulting rubber composition at a temperature of from 110.degree. to 160.degree. C.;adding to and homogeneously dispersing throughout said rubber composition a suitable vulcanizing agent at a temperature lower than the vulcanization temperature.