Polyamide moulding compounds having high impact strength

Claim 1

A polymer blend consisting of I. from 60 to 99% by weight of a polyamide; II. from 1 to 40% by weight of a graft product consisting of (a) from 70 to 99% by weight of a graft substrate of polyethylene and/or a copolymer of ethylene and a vinyl ester containing up to 50% by weight of the vinyl ester, and (b) from 1 to 30% by weight of grafted units of (α) from 0 to 100% by weight, based on the total weight of grafted units, of (meth) acrylic acid, (β) from 0 to 100% by weight, based on the total weight of grafted units, of an ester of (meth) acrylic acid formed from an alcohol having from 1 to 8 carbon atoms, (γ) from 0 to 30% by weight, based on the total weight of grafted units, of acrylamide and (δ) from 0 to 30% by weight, based on the total weight of grafted units, of maleic acid anhydride, the sum total of grafted units (α) and (δ) being 100% by weight of the total grafted units of said graft product and said products having been prepared by a process of graft polymerization which comprises bringing a solvent free melted polymer used as a graft substrate into contact with oxygen or an oxygen-containing gas at a pressure of from 1 to 150 bar and at a temperature of from 80° to 300° C. under conditions of vigorous mixing for a maximum of 10 minutes, adding immediately thereafter the monomers which are to be grafted under conditions of vigorous mixing in the absence of oxygen and oxygen-containing gas, and removing the residual monomers after polymerization; and III. from 0 to 20% by weight of polyethylene.