METHOD OF PRODUCING POLYMER LATEX FOR PHOTO-CHEMICAL INDUSTRY Russian patent published in 1994 - IPC

FIELD: polymer chemistry. SUBSTANCE: water-emulsion polymerization of 50% of butyl acrylate total amount is accomplished in the presence of sodium dodecylbenzosulfonate and potassium persulfate at 90-95 C for 1 hr. Then a mix of butylacrylate, methacrylic acid, and pyrazolone-5 derivative at a 1.0: 0.2: 1.0-1.4 mass ratio is added to polymerization medium and another polymerization process is initiated. EFFECT: no coagulum produced after 6 months of storage. 1 tbl