Plastisol compositions and method of making them

Claim 1

IN THE METHOD OF PREPARING A STABLE PLASTISOL BLOWING COMPOSITION BY DISPERSING AN EMULSION TYPE PLASTISOL GRADE POLYMER OF VINYL CHLORIDE OF MOLECULAR WEIGHT BETWEEN 45,000 AND 80,000 IN FINELY DIVIDED FORM CONTAINING A COATING OF A SOAP IN A PLASTICIZER FOR SAID POLYMER, THE IMPROVEMENT WHICH COMPRISES COMBINING AT LEAST 4 PERCENT OF THE POLYMER WITH LESS THAN HALF OF THE PLASTICIZER TO FORM A MIXTURE OF WHICH ABOUT 25-30 PERCENT BY WEIGHT IS POLYMER, AGITATING SAID MIXTURE WHILE HEATING IT TO AT LEAST 50*C. UNTIL ITS VISCOSITY HAS INCREASED TO AT LEAST ABOUT 1,600 CP. AS MEASURED AT 25*C. ON A BROOKFIELD RVF VISCOSIMETER WITH A NO. 5 SPINDLE AT 20 R.P.M., COOLING SAID MIXTURE TO ABOUT ROOM TEMPERATURE, SAID HEATING BEING INSUFFICIENT TO INDUCE GEL FORMATION WHEN SAID MIXTURE IS COOLED, AND COMBINING THE MIXTURE WITH THE BALANCE OF POLYMER AND PLASTICIZER TOGETHER WITH AN AMOUNT OF SODIUM BICARBONATE COMPRISING FROM ABOUT 0.1-2.0 PERCENT BY WEIGHT OF THE FINAL MIXTURE, AND AN AMOUNT OF CALCIUM OXIDE COMPRISING FROM ABOUT 0.2-5.0 PERCENT BY WEIGHT OF THE FINAL MIXTURE.