METHOD OF PREPARING FILM-FORMING COPOLYMER Russian patent published in 1999 - IPC

FIELD: chemistry of polymers. SUBSTANCE: film-forming copolymer is prepared by thermal copolymerization of stillage residues resulting from rectification of styrene in ethyl benzene production and stillage residues resulting from rectification of styrene in combined production of styrene and propylene oxide and maleic anhydride. The resulting copolymer is further treated with diethylene glycol and/or propylene glycol of 0.2-1.5 mole per 1 mole of maleic anhydride. EFFECT: high atmospheric-resistance of the film-forming polymer. 7 ex, 2 tbl