2,3,3,3-TETRAFLUORO-1-PROPENE AS DILUENT FOR PRODUCING NOVEL BUTYL RUBBERS Russian patent published in 2019 - IPC C08F210/12 C08F6/06 C08F2/04 C08F8/22 

FIELD: chemistry.

SUBSTANCE: invention relates to an efficient method of producing copolymers with a specific microstructure. Method of producing copolymers involves taking a diluent and a mixture of monomers containing isobutylene and isoprene. Diluent contains at least 50.0 wt. % 2,3,3,3-tetrafluoro-1-propene. Weight ratio of the mixture of monomers to the diluent ranges from 5:95 to 95:5. Further, the mixture of monomers is polymerised in a reaction medium in the presence of an initiating system to form a copolymer solution containing a copolymer, a diluent and residual monomers. Polymerisation is carried out at temperature within range from -100 °C to 0 °C. At the last step, residual monomers and a diluent are separated from the reaction medium to obtain a copolymer.

EFFECT: invention enables to obtain copolymers with a specific microstructure having more uniformly distributed cross-linking sites.

23 cl, 1 tbl, 12 ex