Patent ID: 6028146
Filing Date: 2000-02-22
Classification: C08F

Abstract:
A method of free radical grafting of monomers onto a polypropylene resin comprising:(i) mixing the polypropylene resin having a melt flow index of 0.2 to 100g/10 minutes (230.degree. C./2.16 kg) with an unsaturated epoxy compound having the formula ##STR5## in which R is H or a C.sub.1-4 alkyl; R.sub.1 is --(CH.sub.2).sub.n --; C(O)O--(CH.sub.2).sub.n --; or --(CH.sub.2).sub.n --O--; and n is an integer of 1 to 4;a styrenic compound having the formula: ##STR6## in which R.sub.2 is H, OH, CH.sub.3 or allyl; and a peroxide as an initiator,(ii) heating said mixture to a temperature which is higher than the melting point of the polypropylene resin and the decomposition temperature of said peroxide, at conditions of continuous mixing until a desired degree of grafting of the unsaturated epoxy compound and the styrenic compound onto the polypropylene resin has been achieved, and(iii) cooling and comminuting the obtained composition; wherein said unsaturated epoxy compound is used in an amount of from 5 to 10% by weight and said styrenic compound is used in an amount of from 2 to 10% by weight based on the weight of the polypropylene resin.