Patent ID: 6506847
Filing Date: 2003-01-14
Classification: C08F

Abstract:
A process for reducing the molecular weight of graft copolymers comprising, in a substantially non-oxidizing atmosphere,(a) treating a propylene polymer material with an organic compound that is a free radical polymerization initiator, (b) treating the propylene polymer material over a period of time that coincides with or follows (a) with or without overlap, with about 2 to about 240 parts per hundred parts of the propylene polymer material, of at least one vinyl-substituted grafting monomer capable of being polymerized by free radicals, in the presence of about 0.5% to about 5% by weight, based on the total weight of monomer, of a polymerizable chain transfer agent that is an ether or ester of allyl alcohol, and (c) removing any unreacted monomer from the resulting grafted propylene polymer material, decomposing any unreacted initiator, and deactivating any residual free radicals in the material.