Vinyl chloride polymers dried in the presence of metal ions and ammonium salts of monocarboxylic acids

Claim 1

THE PROCESS OF PRODUCING A DRIED VINYL POLYMER SELECTED FROM THE GROUP CONSISTING OF VINYLCHLORIDE HOMOPOLYMER AND COPOLYMERS CONTAINING AT LEAST 80% BY WEIGHT OF VINYLCHLORIDE, SAID VINYL POLYMER BEING ADAPTED FOR THE PREPARATION OF DISPERSIONS WITH AT LEAST ONE SOFTENER FOR VINYL POLYMERS, WHCIH COMPRISES THE STEPS OF MIXING AT LEAST ONE MONOMER SELECTED FROM THE GROUP CONSISTING OF CINYLCHLORIDE AND MIXTURES OF VINYLCHLORIDE WITH MONOMERS COPOLYMERIZABLE THEREWITH, SAID MIXTURES CONTAINING AT LEAST 80% VINYLCHLORIDE, WITH WATER IN THE PRESENCE OF A FREE-RADICAL POLYMERIZATION CATALYST AND FROM ABOUT 0.1% TO 5%, BASED ON THE WEIGHT OF SAID MONOMER, OF AT LEAST ONE AMMONIUM SALT OF ORGANIC CARBOXYLIC ACIDS HAVING FROM 8 TO 22 CARBON ATOMS, HEATING SAID MIXTURE TO A TEMPERATURE BETWEEN ABOUT ROOM TEMPERATURE AND 100*C, AND MAINTAINING SAID TEMPERATURE FOR A TIME SUFFICIENT TO EFFECT POLYMERIZATION, DEWATERING THE POLYMER DISPERSION, AND DRYING THE RECOVERED VINYL POLYMER, WITH THE PROVISO THAT AT SOME TIME GEFORE THE TERMINATION OF THE DRYING OF SAID VINYL POLYMER, SUFFICIENT IONS OF METALS SELECTED FROM THE GROUP CONSISTING OF METALS OF GROUP IA OF THE PERIODIC SYSTEM, METALS OF GROUP KKA OF THE PERIODIC SYSTEM, CADMIUM AND LEAD ARE ADDED TO REPLACE 20% TO 70% OF THE AMMONIUM IONS IN SAID AMMONIUM SALT IN THE UNDRIED POLYMER.