POLYESTERS FOR FORMING PREPREGS AND METHOD OF PRODUCING SAME Russian patent published in 2019 - IPC C08G65/40 C08G75/20 

FIELD: chemistry.

SUBSTANCE: invention relates to aromatic polyesters, in particular to aromatic polyethersulfonarylates, as well as to a method for production thereof. Polyesters can be used as a polymer matrix of prepregs used in aviation, space, automotive and other industries, as well as in electronics and electrical engineering. Polyesters have the following formula, in which n=1–20; m=1–30; z=1–30. Method of producing polyesters involves reacting oligosulphones based on 4,4'-dihydroxy-2,2-diphenylpropane with condensation degrees of 1–20 with equimolar mixture of terephthaloyl chloride and 1,1-dichloro-2,2-di(4-carboxyphenyl)ethylene for 1 hour in dichloroethane medium at room temperature. Polymer solution is then diluted with dichloroethane to a solution concentration of 5–10 % and held for 1 hour without stirring. After demixing, the bottom layer is poured from the reactor in the form of a transparent solution which does not contain hydrochloric triethylamine. Triethylamine hydrochloride produced in the upper layer is washed with dichloroethane and used as an independent product.

EFFECT: invention enables to obtain polyesters with high fire-, heat- and thermo-resistance, as well as mechanical characteristics.

3 cl, 1 tbl, 4 ex