Process of preparing copolymers of butyl acrylate and 1-( alpha -alkyl acrylate)-1-tert-butyl peroxy ethanes

PCT No. PCT/SU79/00015 Sec. 371 Date Nov. 13, 1980 Sec. 102(e) Date Nov. 6, 1980 PCT Filed Mar. 13, 1979 PCT Pub. No. WO80/01916 PCT Pub. Date Sep. 18, 1980.The process for preparing copolymers of butyl acrylate and 1-( alpha -alkyl acrylate)-1-tert-butyl peroxy ethanes comprises performing emulsion copolymerization of butyl acrylate and 1-( alpha -alkyl acrylate)-1-tert-butyl peroxy ethanes in the presence of an initiating system consisting of sodium metabisulfite in an amount of 0.008 to 1.650% of the total mass of monomers and a compound of the general formula NaxHySzO3, where "x" is an integer of 1 or 2, "y" is zero or 1, "z" is an integer of 1 or 2, said compound being in an amount of 0.002 to 0.360% of the total mass of monomers. In accordance to the required characteristics of the copolymers, i.e. extent of the final product swelling and the gel fraction content therein, the initiating system amount is determined from the formula: +TR c-amount of the initiating system, in % of the mass of initial monomers; alpha -extent of the final product swelling, in % of the final product mass; G-gel fraction content of the final product, in % of the final product mass.