Patent ID: 6900268

Claim:
A method of grafting an unsaturated carboxylic acid derivative onto a thermoplastic polymer, which method comprises heating a mixture of thermoplastic polymer, unsaturated carboxylic acid or carboxylic acid derivative and a hydroxylamine ester having at least one structural unit of formula (I) or (I′) wherein X is hydrogen, C 1 -C 36 alkyl, C 1 -C 36 alkyl which is substituted by halogen, C 5 -C 12 cycloalkyl, C 7 -C 12 bicyclo- or tricycloalkyl, C 2 -C 36 alkenyl, C 2 -C 18 alkynyl, C 6 -C 10 aryl, —O—C 1 -C 18 alkyl, —O—C 6 -C 10 aryl, —NH—C 1 -C 18 alkyl, —NH—C 6 -C 10 aryl, —N(C 1 -C 6 alkyl) 2 ; and X′ is a direct bond or C 1 -C 36 alkylene, C 2 -C 36 alkenylene, C 2 -C 36 alkynylene, —(C 1 -C 6 alkylene)-phenyl-(C 1 -C 6 alkylene) or a group in a processing apparatus for thermoplastic polymers, to above the softening point or melting point of the thermoplastic polymer and allowing the components of the mixture to react with one another.