Process for the production of fireresistant methacrylate resin compositions containing phosphates

Claim 1

A POLYMERIZATION PROCESS WHICH COMPRISES POLYMERIZING A MONOMERIC COMPOSITION IN BULK OR IN SOLUTION, SAID MONOMER COMPOSITION, WHICH MAY BE PARTIALLY POLYMERIZED, COMPRISING METHYL METHACRYLATE OR MIXTURES OF METHYL METHACRYLATE WITH UP TO 15% BY WEIGHT, BASED ON THE TOTAL WEIGHT OF SAID MONOMERIC COMPOSITION, OF A SECOND COPOLYMERIZABLE MONOMER SELECTED FROM THE GROUP CONSISTING OF ACRYLIC ACID, METHACRYLIC ACID ACRYLATE ACID ESTERS, METHACRYLIC ACID ESTERS, STYRENE, HALOGEN SUBSTITUTED STYRENE, AND ACRYLONITRILE, TO WHICH HAS BEEN ADDED PHOSPHORUS PENTOXIDE AND AT LEAST ONE ALCOHOL SELECTED FROM THR CLASS CONSISTING OF ALIPHATIC ALCOHOLS, CYCLOALIPHATIC ALCOHOLS AND ARALKYL ALCOHOLS CONTAINING FROM 1 TO 8 CARBON ATOMS PER MOLECULE, THERE BEING FROM 1.5 TO 5 MOLES OF ALCOHOL OR MIXTURE OF ALCOHOLS TO EACH MOLE OF PHOSPHORUS PENTOXIDE, AND INITIATING POLYMERIZATION OF THE POLYMERIZABLE INGREDIENTS DURING OR AFTER REACTION OF THE PHOSPHORUS PENTOXIDE AND SAID ALCOHOL, THE AMOUNT OF SAID PHOSPHORUS PENTOXIDE AND SAID ALCOHOL INITIALLY ADDED FORMING FROM 3 TO 20% BY WEIGHT OF THE TOTAL WEIGHT OF POLYMERIZABLE INGREDIENTS IN THE MATERIAL UNDERGOING POLYMERIZATION TOGETHER WITH ANY POLYMER PRESENT PLUS THE WEIGHT OF SAID INITIALLY ADDED PHOSPHORUS PENTOXIDE AND SAID ALCOHOL.