METHOD OF PREPARING SPARSELY CROSS-LINKED ACRYLIC ACID COPOLYMERS Russian patent published in 1999 - IPC

FIELD: organic chemistry, more particularly stabilization of natural and synthetic latexes, preparation of cosmetics and pharmaceuticals, surgical gels, and cintments. SUBSTANCE: method comprises polymerizing acrylic acid in solvent in the presence of cross-linking agent and initiator. Cross-linking agent is polybutadiene in amount of 1-3% based on acrylic acid weight and in the presence of modifying perfluoroacid additive of general formula: wherein n is 7-32 in amount of 0.1-0.5% based on acrylic acid weight. Method makes it possible to remove technological difficulties of polymerization process, e.g. adhesion of product onto apparatus walls, caking, formation of aggregates which result in longer drying time and deteriorated quality of the desired product. EFFECT: improved properties of the resulting copolymer. 1 tbl