Process for impregnating glass fiber mat with methyl methacrylate polymer

Claim 1

A PROCESS WHICH COMPRISES IMPREGNATING A GLASS FIBER MAT WITH A METHYL METHACRYLATE MONOMER-POLYMER SYRUP CONTAINING FROM 5 TO 50% BY WEIGHT OF METHYL METHACRYLATE POLYMER AND COMPLEMENTALLY FROM 95 TO 50% BY WEIGHT OF METHYL METHACRYLATE, SAID SYRUP HAVING A BULK VISCOSITY IN THE RANGE OF 0.5 TO 50 POISES, AND CONTAINING METHYL METHACRYLATE POLYMER HAVING AN INGHERENT VISCOSITY OF 0.25 TO 1.0, SAID SYRUP HAVING ADMIXED THEREIN, 0.01 TO 1.0% BY WEIGHT OF A MERCAPTAN, UP TO 3.0 PARTS/MILLION OF COPPER IN DISSOLVABLE FORM, AND 0.01 TO 2.0% OF A PEROXIDE CURING AGENT, SAID FIBER MAT HAVING SNCL2 COATED THEREON IN QUANTITY OF 15 TO 250 PARTS/MILLION PARTS OF SAID SYRUP, AND REMOVING FROM THE RESULTANT MAT, THE EXCESS OF IMPREGNATING LIQUID, WHICH IS UNRETAINED BY THE MAT, SAID EXCESS LIQUID BEING SUFFICIENTLY STABLE TO BE THUS RECOVERED, AND RE-USED FOR THE IMPREGNATION OF SNCL2-COATED GLASS FIBER MAT.