Process for preparing graft and block copolymers

Claim 1

A process for preparing block and/or graft copolymers wherein said process comprises: a. forming an intimate mixture of two or more polymers selected from the group consisting of polyamides, polyesters, acid homopolymers of alpha beta unsaturated carboxylic acids and acid copolymers of alpha, beta unsaturated carboxylic acids and alpha beta unsaturated olefins, and an effective amount of one or more phosphite compounds of the formula ##STR4## and symmetrical and asymmetrical diphosphite derivatives thereof; wherein R 1 is alkyl, haloalkyl, or phenyl either unsubstituted or substituted with one or more substituents selected from the group consisting of alkyl, halogen, haloalkyl, nitro, cyano, and isocyanato, with R 2 and R 3 being the same or different and being a metal cation, ammonium cation, hydrogen or R 1 ; wherein at least one of said polymers includes one or more amino moieties and at least one of the remaining polymers includes one or more carboxylic acid moieties; and b. heating said mixture for a period of time between about 2 minute and about 30 minutes at a temperature at or above the melting point of said polymers to form said block and/or graft copolymer.