METHOD OF PRODUCING LINEAR BLOCK-COPOLYMERS (METH) ACRYLIC MONOMERS Russian patent published in 2018 - IPC C08F293/00 C08F2/02 C08F2/38 

FIELD: chemistry.

SUBSTANCE: method of producing linear block-copolymers of methacrylic monomers involves sequentially synthesizing the first and the second blocks of copolymers by the controlled radical polymerization. At the first stage, obtaining a polymethacrylate initiator is carried out through the synthesis of its monomer A with dinitrile of isoiso-butyric acid used as an initiator, and 4,6-di-tert-butyl-N-(2,6-diisopropylphenyl)-o-imino-benzoquinone used as a polymerization regulator, when their molar ratio of monomer: initiator: polymerization regulator as 1000:(1÷8):(1÷8) for 3-20 hours at a temperature of 70°C, at the second stage obtaining a diblock-copolymer is carried out by the copolymerization of the obtained polymethacrylate initiator with the monomer B, in their weight ratio of (10-25):(90-75) for 1-15 hours at a temperature of 70°C. The monomer B is not styrene, or styrene is used as the azeotropic mixture with methyl methacrylate as the monomer B if methacrylate is used as the monomer A or styrene is used as the monomer B when n-butylmethacrylate is used as the monomer A.

EFFECT: production of finely dispersed block-copolymers of various molecular weights and with the variation of monomeric compositions.

7 cl, 2 tbl, 3 dwg