METHOD OF PRODUCING TETRAFLUOROETHYLENE COPOLYMERS, COPOLYMERS AND ARTICLES THEREOF Russian patent published in 2020 - IPC C08F214/26 C08F214/28 C08J5/18 

FIELD: chemistry.

SUBSTANCE: invention relates to fluoropolymer materials and specifically to a method of producing copolymers of tetrafluoroethylene (TFE) with perfluoromethylvinylether (PFMVE) and hexafluoropropylene (HFP) of a wide range of assortments, of various types (dispersion, powders, granules) and articles made therefrom. Method of producing copolymers of tetrafluoroethylene with perfluoromethylvinyl ether and ternary copolymers with hexafluoropropylene via water-emulsion copolymerisation is carried out in the presence of a radical initiator at high pressure and temperature. Mixture used in the process of copolymerisation in composition of monomers must be in the following range: from 67 to 90 mol. % of tetrafluoroethylene, 5–33 mol. % of perfluoromethylvinyl ether and 0–10 mol. % of hexafluoropropylene. At the beginning of copolymerisation in the reaction medium, the following composition of monomers is provided: from 54.6 to 81.05 mol. % of tetrafluoroethylene, 10–45.4 mol. % of perfluoromethylvinyl ether and 0–34 mol. % of hexafluoropropylene at pressure in range of 1.2–1.6 MPa, which is maintained constant. Emulsifier used is a mixture of ammonium salts of perfluorocarboxylic acids in weight ratio of 1:1 to 1:1.34 and 1:2.

EFFECT: technical result is obtaining copolymers of different types and properties using a single technology.

6 cl, 4 tbl, 8 ex