Process for preparing homo- and copolymers of vinyl chloride in an aqueous emulsion and subsequently spray drying the latex

Claim 1

A PROCESS FOR THE MANUFACTURE OF A VINYL POLYMER IN A FORM HAVING UNIQUE PASTE-FORMING PROPERTIES WHICH COMPRISES POLYMERIZING IN AN AQUEOUS EMULSION A MEMBER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND A MIXTURE OF VINYL CHLORIDE WITH UP TO 20% BY WEIGHT OF THE MIXTURE OF A COMONOMER SELECTED FROM THE GROUP CONSISTING OF A FATTY ACID ESTER OF VINYL ALCOHOL, VINYLIDENE CHLORIDE AND AN ACRYLIC ACID ESTER OF AN ALIPHATIC ALCOHOL CONTAINING 1-12 CARBON ATOMS, A MALEIC ACID ESTER OF AN ALIPHATIC ALCOHOL CONTAINING 1-12 CARBON ATOMS, AND A FUMARIC ACID ESTER OF AN ALIPHATIC ALCOHOL CONTAINING 1-12 CARBON ATOMS, SAID POLYMERIZATION BEING CONDUCTED IN THE PRESENCE OF AN EMULSIFIER WHICH IS SOLUBLE TO THE EXTENT OF AT LEAST 30% BY WEIGHT IN BENZENE AT 25*C. AND THE AQUEOUS SOLUTION OF WHICH HAS A SURFACE TENSION OF AT MOST 32 DYNES/CM. AS MEASURED WITH THE TRAUBE-STALAGMOMETER, WHEREBY A POLYMER LATEX IS FORMED HAVING A POLYMER PARTICLE SIZE OF ABOUT 0.5-0.8 MICRON, THEN ADDING TO SAID POLYMER LATEX 0.2-4% BY WEIGHT, BASED ON THE WEIGHT OF THE POLYMER, OF A WAX-LIKE COATING AGENT SELECTED FROM THE GROUP CONSISTING OF FATTY ACID ESTERS OF POLYHYDRIC ALCOHOLS, POLYGLYCOL ETHERS OF POLYHYDRIC ALCOHOLS AND SEMI-ESTERS THEREOF, PHOSPHORIC ACID ESTERS OF MONOHYDRIC ALCOHOLS CONTAINING 6-20 CARBON ATOMS, PHTHALIC ACID ESTERS OF MONOHYDRIC ALCOHOL CONTAINING 6-20 CARBON ATOMS, POLYGLYCOL ESTERS OF PHOSPHORIC ACID, AND POLYGLYCOL ESTERS OF PHTHALIC ACID, AND SUBSEQUENTLY SPRAY DRYING THE RESULTING POLYMER LATEX.