Method of preparing moulded article from polymerisable materials

Claim 1

A PROCESS FOR PRODUCING SYNTHETIC RESIN PRODUCTS COMPRISING MAKING A MONOMER MIXTURE INCLUDING 20 TO 80% BY WEIGHT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF METHYL METHACRYLATE, STYRENE, VINYL ACETATE, METHACRYLIC ACID, ALLYL ACETATE, ACRYLONITRILE AND ACRYLAMIDE AND 20 TO 80% BY WEIGHT OF A MONOMER SELECTED FROM THE GROUP CONSISTING OF ALLYL METHACRYLATE, ETHYLENE GLYCOL DIMETHACRYLATE, DIVINYL BENZENE, DIALLYL MALEATE, TRIALLYL ACONITATE AND METHACRYLIC ANHYDRIDE, TOGETHER WITH A POLYMERIZATION CATALYST FOR SAID MONOMERS, WHERE THE MONOMERIC COMPONENTS OF SAID MIXTURE ARE METHYL METHACRYLATE AND ALLYL METHACRYLATE THE CONTENT OF ALLYL METHACRYLATE BEING NOT SUBSTANTIALLY IN EXCESS OF 50% BY WEIGHT, PARTIALLY POLYMERISING SAID MIXTURE TO FORM A FLOWABLE SYRUP, PLACING SAID SYRUP IN A CASTING MOULD, POLYMERISING SAID SYRUP IN SAID MOULD TO PRODUCE A MOULDABLE, RIGID, WORKABLE PARTIAL POLYMER, REMOVING SAID PARTIAL POLYMER FROM SAID MOULD, AND SUBSEQUENTLY SHAPING SAID PARTIAL POLYMER AND CURING IT TO INFUSIBLE FORM.