Process for grafting unsaturated monomers onto polyamides

Claim 1

IN THE PROCESS OF PRODUCING A GRAFT-SYNTHETIC COPOLYMER OF (A) A SYNTHETIC LINEAR CONDENSATION POLYMER SUBSTRATE AND (B) A POLYMERIZABLE MONOETHYLENICALLY UNSATURATED, MONOMERIC MODIFIER SELECTED FROM THE GROUP CONSISTNG OF AMIDES; ACRYLATE ESTERS; VINYL ALCOHOLS; VINYL AMINES, ESTERS, ETHERS AND KETONES; CYANIDES; HALIDES; PHOSPHOROUS CONTANING VINYLS; AND SULFUR CONTAINING VINYLS, SAID SYNTHIC LINEAR CONDENSATION POLYMER BEING A SYNTHETIC LINEAR FIBER-FORMING POLYCARBONAMIDES CONTAINING RECURRING AMIDE GROUPS AS AN INTEGRAL PART OF THE POLYMER CHAIN, THE IMPROVEMENT WHICH CONSISTS OF HEATING TOGETHER A STIRRABLE MELT WHOSE REACTIVE COMPONENTS CONSIST EXCLUSIVELY OF SAID SUBSTRATE AND MODIFIER, AT A TEMPERATURE IN THE RANGE OF 110* TO 400*C., SAID TEMPERATURE BEING ABOVE THE INITIAL SOLIDIFICATION POINT OF THE MIXTURE BUT BELOW THE TEMPERATURE AT WHICH SUBSTANTIAL DEGRADATION OF EITHER REACTANT OCCURS, SAID SUBSTRATE BEING SUBJECTED TO SAID HEATING WITHOUT PRE-TREATMENTS DESIGNED TO FORM TTHEREON FREE RADICALS, AND SAID HEATING OF THE MELT BEING THE ONLY SOURCE OF ENERGY APPLIED TO THE REACTION MIXTURE