STRUCTURAL AROMATIC POLYESTERS AND METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C08G75/23 C08G65/40 

FIELD: chemistry.

SUBSTANCE: invention relates to aromatic polyesters, in particular to aromatic polyether sulphonylates, which can be used as structural materials in aircraft, space, automotive and other industries, as well as in electronics and electrical engineering. Aromatic polyesters have the following formula, in which n=1–20; m=1–30; z=1–30. Aromatic polyesters are obtained in two steps. At the first stage of synthesis, method includes accepting-catalytic polycondensation of oligoester sulphone based on 1,1-dichloro-2,2-di(n-oxyphenyl)ethylene with condensation degree of 1–20 with an equimolar mixture of terephthalic acid diacyl chlorides and 1,1-dichloro-2,2-di(4-carboxyphenyl)ethylene in a high-boiling solvent ditolyl methane or diphenyl oxide at temperature of 25–180 °C for 0.5 h. At the second step, high-temperature polycondensation is carried out in the presence of triethylamine hydrochloride for 3 hours at 180 °C the polymer solution is then diluted with hot tetrachloroethane and precipitated into isopropanol. Obtained polymer does not contain traces of hydrochloric triethylamine. Conjured hydrochloric triethylamine is collected from the inner surface of the reactor cover, washed with dichloroethane and used as an independent product.

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

2 cl, 1 tbl, 3 ex