Plastisols of vinyl chloride polymer

Claim 1

AN IMPROVED PLASTISOL WHICH GIVES UPON GELATION A PLASTIC COMPOSITION OF EXTREMELY HIGH ELECTRICAL RESISTIVITY COMPRISING A FINELY DIVIDED POLYMER OF VINYL CHLORIDE UNIFORMLY DISPERSED AND SUSPENDED IN ABOUT 40% TO 125% BY WEIGHT OF A LIQUID ESTER PLASTICIZER BOILING ABOVE ABOUT 125* C. UNDER 1 MM. HG PRESSURE, SAID POLYMER PRODUCED BY A PROCESS WHEREIN LIQUID VINYL CHLORIDE IN ADMIXTURE WITH UP TO 5% BY WEIGHT OF ANOTHER POLYMERIZABLE COMPOUND CONTAINING ONE VINYLIDENE RADICAL AS SOLE POLYMERIZABLE GROUP THEREIN IS POLYMERIZED AS AN EMULSION IN AN AQUEOUS MEDIUM AT ABOUT 30* C. TO 60* C. IN THE PRESENCE OF A PEROXY POLYMERIZATION CATALYST SOLUBLE IN SAID MONOMER FOR A TIME OF AT LEAST 15.5 HOURS, AND THE PREPARATION AND RECOVERY OF SAID POLYMER IS EFFECTED WITH AN AMMONIUM SALT EMULSIFYING AGENT AS THE SOLE STRONG ELECTROLYTE EMPLOYED IN CONTACT WITH SAID POLYMER, SAID EMULSIFYING AGENT BEING AN AMMONIUM SALT OF AN ORGANIC ACID HAVING THE ACID GROUP SELECTED FROM THE CLASS CONSISTING OF CARBOXYLIC ACID, SULFONIC ACID, AND HYDROGEN SULFATE GROUPS, WHICH ACID GROUP IS LINKED DIRECTLY TO A RADICAL CONTAINING 8 TO 20 CARBON ATOMS WHICH IS OTHERWISE FREE OF SALT-FORMING AND IONIZABLE GROUPS.