Patent ID: 7553802
Filing Date: 2009-06-30
Classification: C08F

Abstract:
1. A process to modify the rheology of a EP(D)M polymer, said process consisting of: treating, in conditions of high shear, a polymer mixture consisting of one or more EP(D)M polymers, optionally mixed with polyalpha-olefins, in presence of one or more polyfunctional vinyl monomers and of one or more hydroperoxides in water, wherein an amount of said the polyfunctional vinyl monomer is from 0.02 to 2% by weight, wherein a molar ratio between said vinyl monomer and hydroperoxide is from 0.005/1 to 2/1, and said process being carried out at a temperature from 75° C. to 260° C.; in which the polymer mixture consists of one or more EP(D)M polymers selected from the group consisting of one or more EPM polymers which are ethylene-propylene copolymers, -one or more EPDM ter-polymers which are ethylene-propylene-not conjugated diene terpolymers and mixtures thereof; wherein an ethylene content of said EP(D)M polymers is from 85% to 40% by weight, and wherein, if present, a maximum amount of said not-conjugated diene is 12% by weight.