Patent ID: 8242207

Claim:
A process for synthesis of a graft copolymer obtained by grafting: a copolymer (II) obtained from the copolymerization of at least two monomers, (i) the first monomer being selected from styrene and its derivatives and (ii) the second monomer containing at least one anhydride function, with molecules M-R—X (I) containing at least one heterocycle unit (M) selected from the group consisting of units (1) to (4): with A=oxygen, sulphur or NH; and containing at least one chemical function (X) selected from a halogen, a primary or secondary amine function, an alcohol function, a thiol function, a carboxylic acid function or a derivative of this function and an epoxy function, the unit (M) and said function (X) being connected by a rigid or flexible chain (R), wherein the molecules (I) are obtained from the reaction of urea with at least one compound containing at least one primary amine function (—NH 2 ) and at least one secondary amine function (—NH—), said functions being connected by a carbon chain containing at least two carbon atoms; and the molecules (I) are contacted with the copolymer (II) in the melt state, without solvent, in an extruder, a calender, or any other mixer.