METHOD OF POLYVINYL ACETATE DISPERSION PRODUCING Russian patent published in 1996 - IPC

FIELD: polymers, chemical technology. SUBSTANCE: polyvinyl acetate dispersion is prepared by an aqueous-emulsion polymerization in the presence of copolymer of styrene with maleic anhydride neutralized with sodium hydroxide per 0.48-0.52 carboxylic group equivalents and bis-(alkylpolyhydroxyethylene)-phosphate. The first is used as protective polymeric colloid and the second - as emulsifier. Their total content in dispersion is 5-14 mas. p. per 100 mas. p. vinyl acetate and mass ratio = (2: 1)-(1: 2). Dispersion synthesis is carried out by polymerization initiation with water-soluble radical initiating agent - potassium persulfate. Dispersion can be used in chemical industry. EFFECT: increased stability of dispersion during storage. 1 tbl