Suspension process for production of polyvinyl chloride

Claim 1

A SUSPENSION PROCESS FOR THE POLYMERIZATION OF VINYL CHLORIDE COMPRISING FORMING IN A POLYMERIZATION ZONE A CHARGE INCLUDING (A) VINYL CHLORIDE MONOMER, (B) AT LEAST 150 PARTS OF WATER PER 100 PARTS OF THE MONOMER INITIALLY INTRODUCED INTO SAID ZONE, (C) FROM ABOUT 0.2 TO ABOUT 1 PERCENT OF AN OIL-SOLUBLE PEROXYGEN POLYMERIZATION CATALYST, BASED ON THE WEIGHT OF THE MONOMER INITIALLY INTRODUCED INTO SAID ZONE, AND (D) FROM ABOUT 0.1 TO 0.5 PART OF A WATER-SOLUBLE SUSPENSION MATERIAL BASED ON 100 PARTS OF WATER IN THE CHARGE, AGITATING SAID CHARGE, AND IMPOSING UPON SAID CHARGE AN INITIAL FIXED TEMPERATURE OF ABOUT 60*C. FOR AT LEAST ABOUT ONE HOUR TO CAUSE POLYMERIZATION TO OCCUR, THEN CONTINUING THE POLYMERIZE SAID CHARGE WHILE DECREASING THE TEMPERATURE UPON THE CHARGE UNTIL THE POLYMERIZATION IS AT LEAST 75 PERCENT TO ABOUT 90 PERCENT COMPLETE, AT WHICH TIME THE TEMPERATURE OF THE CHARGE IS ABOUT 10* C. BELOW THE INITIAL POLYMERIZATION TEMPERATURE IMPOSED UPON THE CHARGE.