Patent ID: 6218449
Filing Date: 2001-04-17
Classification: C08G,C08L,C10C

Abstract:
Process for the preparation of functionalized elastomer/bitumen compositions with a wide plasticity range, in which a bitumen or mixture of bitumens is brought into contact, the operation being carried out at temperatures of between 100.degree. C. and 230.degree. C. and with stirring for a period of time of at least ten minutes, with, with respect to the weight of the bitumen, between 0.5% and 25% of an elastomer and between 0.01% and 6% of a functionalization agent, wherein the functionalization agent is composed of at least one compound selected from the group consisting of:(i) poly(thiolcarboxylic esters) A corresponding to the formula ##STR7##(ii) polythioethers B resulting from the reaction of at least one polythiolester A with ethylene sulphide and containing, on average, 0.1 to 20 (SCH.sub.2 CH.sub.2) units per molecule A and(iii) polythioethers E resulting from the reaction of at least one thiol compound D of formula ##STR8##with ethylene sulphide and containing, on average, 0.1 to 20 (SCH.sub.2 CH.sub.2) units per molecule D, with, in these formulae, R denoting a y-valent hydrocarbon radical, which optionally contains oxygen, having a molecular weight at least equal to 28 and which can range up to 20,000, R.sub.1 representing a (t+2)-valent C.sub.1 to C.sub.30 hydrocarbon radical, R.sub.2 representing an (x+t+1)-valent C.sub.1 to C.sub.30 hydrocarbon radical, X denoting a hydrogen atom or a monovalent C.sub.1 to C.sub.12 hydrocarbon radical R.sub.5, t representing zero or one, y being an integer ranging from 2 to 10 and x denoting an integer having a value ranging from 1 to 3, with x+t.ltoreq.3.