AROMATIC COPOLYESTER-SULPHONE KETONES OF HIGH FIRE-RESISTANCE Russian patent published in 2019 - IPC C08G75/23 C08G65/40 

FIELD: chemistry.

SUBSTANCE: invention relates to aromatic copolyester-sulphone ketones (CPESK), which can be used as thermo- and heat-resistant structural polymer materials, as well as to a method of producing aromatic copolyester-sulphone ketones. Aromatic copolyester-sulphone ketones have the following formulas (I)–(IV). Method of producing aromatic copolyester-sulphone ketones involves reacting high-temperature polycondensation 3,3',5,5'-tetrabromophenolphthalein, 3,3',5,5'-tetrabromodiphenylol propane, 4,4'-dichlorodiphenylsulphone and 4,4'-difluorobenzophenone, or 3,3',5,5'-tetrabromophenolphthalein, 4,4'-dioxydiphenylpropane, 4,4'-dichlorodiphenylsulphone and 4,4'-difluorobenzophenone, or 3,3',5,5'-tetrabromophenolphthalein, phenolphthalein, 4,4'-dichlorodiphenylsulphone and 4,4'-difluorobenzophenone, or 3,3',5,5'-tetrabromophenolphthalein, 4,4'-dioxydiphenyl, 4,4'-dichlorodiphenylsulphone and 4,4'-difluorobenzophenone. Reaction is carried out at temperature of 170 °C in medium of N,N-dimethylacetamide. Hexabromobenzene is then added to the reaction mixture as a blocker of end phenoxide groups and a substance, which increases fire resistance of the copolyesters. Further, the reaction mixture is diluted with N,N-dimethylacetamide, distilled during synthesis.

EFFECT: invention enables to obtain aromatic copolyester-sulphone ketones with high thermal- and heat-resistance and high fire-resistance.

2 cl, 1 tbl, 28 ex