Patent ID: 6087420
Filing Date: 2000-07-11
Classification: C08K,C08L,C10C

Abstract:
Process for the preparation of polymer/bitumen compositions with reinforced mechanical properties, which comprises contacting, at temperatures of between 100 C. and 230 C. and with stirring for a period of time of at least 10 minutes, a bitumen or mixture of bitumens with, with respect to the weight of the bitumen or mixture of bitumens, 0.1% to 30% of a copolymer of styrene and butadiene containing 50% to 95% of units from butadiene, and having a proportion of units containing a 1,2 double bond resulting from butadiene of between 12% and 50% by weight of the copolymer, with an amount of a crosslinking agent sufficient to effect crosslinking selected from the group consisting of (i) sulphur-donor coupling agents, (ii) functionalization agents selected from the group consisting of carboxylic acids containing thiol or disulphide groups and carboxylic esters containing thiol or disulphide groups and (iii) peroxide compounds generating free radicals at temperatures of between 100 C. and 230 C.