Process for acrylic polymerizations

Claim 1

A PROCESS WHICH COMPRISES IMPREGNATING A GLASS FIBER MAT WITH A METHYL METHACRYLATE MONOMER-POLYMER SIRUP, CONTAINING FROM 5 TO 50% BY WEIGHT OF METHYL METHACRYLATE POLYMER AND COMPLEMENTALLY FROM 95 TO 50% BY WEIGHT OF METHYL METHACRYLATE, SAID SIRUP HAVING A BULK VISCOSITY IN THE RANGE OF 0.5 TO 50 POISES, AND CONTAINING METHYL METHACRYLATE POLYMER HAVING AN INHERENT VISCOSITY OF 0.225 TO 1.0, SAID SIRUP HAVING ADMIXED THEREIN 0.01 TO 1.0% BY WEIGHT OF A MERCAPTAN, 0.005 TO 3.0 PRTS PER MILLION OF COPPER IN DISSOLVED FORM, AND 0.01 TO 2.0% OF A CURING AGENT OF THE CLASS CONSISTING OF HYDROGEN PEROXIDE, METHYL ETHYL KETONE PEROXIDE TERTIARY PERESTERS AND TERTIARY HYDROPEROXIDES, SAID GLASS FIBER MAT HAVING SBCL3 COATED THEREON IN QUANTITY OF 15 TO 250 PARTS PER MILLION PARTS OF SAID SIRUP, 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 A FURTHER QUANTITY OF SBCL3-COATED GLASS FIBER MAT.