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Svetlana Vasilievna Vinogradova

Vasily Vladimirovich Korshak

Lev B Sokolov

Irina Alexandrovna Gribova

Alexandr Petrovich Krasnov

Olga Vladimirovna Vinogradova

Georgy Viktorovich Mamatsashvili

Evgenia Semenovna Krongauz

Galina Ilinichna Gureeva

Alexandr Vasilievich Vinogradov

Alla Markovna Berlin

Vladimir Dmitrievich Vorobiev

Nikolai Sergeevich Zabelnikov

Natalia Monovna Kofman

Andrei Alexandrovich Askadsky

Petr Maximilianovich Valetsky

Abdulakh Kazbulatovich Mikitaev

Ivan Pavlovich Storozhuk

Alla Nikolaevna Chumaevskaya

Ljudmila Fedorovna Nebosenko

Yakov Semenovich Vygodsky

Jury Sergeevich Kochergin

Nikolai Danilovich Zhuravlev

Grigory Lvovich Slonimsky

Leonid Sergeevich Zakharov

Larisa Borisovna Shirokova

Zinaida Vasilievna Geraschenko

Martin Izrailevich Kabachnik

Irina Sergeevna Mazaeva

The present invention relates to novel compounds, viz. poly(arylate-sulphones) and to a method of preparing same. The compounds according to the present invention have the following formula: ##STR1## WHEREIN R is a carbon-to-carbon bond in para- or meta-position; ##STR2## n, m are indices denoting statistical distribution of structures over the macrochain; n and m are statistical values ranging from 1 to 10; x is a statistical value ranging from 1 to 100; y = 3 to 20; z = 5 to 20. The method of preparing said poly-(arylate-sulphones) comprises polycondensation of dichloroanhydrides of dicarboxylic acids with a mixture of bisphenol of the formula: ##STR3## and an oligosulphone of the formula: ##STR4## wherein y = 3 to 20; ##STR5## said oligosulphone being contained in the mixture in an amount ranging from 3 to 97% by weight as calculated for the desired poly(arylate-sulphone). The reaction is conducted in a medium of chlorinated hydrocarbons, followed by isolation of the desired product. The poly(arylate-sulphones) according to the present invention have a melt viscosity within the range of from 10.sup.3.8 to 10.sup.5.0 poises at a temperature of 330.degree. C and a shear stress of 10.sup.6 dn/cm.sup.2, which substantially facilitates their processing into articles by injection-molding or extrusion; they also feature a high heat-resistance as well as high thermal and mechanical characteristics. The method according to the present invention makes it possible to prepare poly(arylate-sulphones) on existing commercial plants producing polyarylates without any changes in the process scheme.

Poly/arylate-sulphones/and method of preparing same

An antifriction self-lubricating material comprising fusible polyimides or polyphenylquinoxalines taken in a quantity of from 5 to 95 percent by weight of the antifriction material, and a filler of molybdenum disulphide modified with phosphorus-containing acids or phosphorus-containing esters, the phosphorus content in the modified molybdenum disulphide being within the range from 0.01 to 2 percent by weight, and the modified molybdenum disulphide being taken in a quantity of from 5 to 95 percent by weight of the antifriction material. The modified molybdenum disulphide employed as the filler imparts improved antifriction properties to the material.

Antifriction self-lubricating material

A method of preparing polyimides by polycondensation of diamines and dianhydrides of tetracarboxylic acids in the presence of a catalyst, viz. a carboxylic acid such as acetic, benzoic, a tetracarboxylic acid taken in an amount of from 0.25 to 10, preferably from 0.8 to 2.5 COOH groups per one unit of a polyimide in a polar organic solvent medium which is inert with respect to the starting diamines and dianhydrides and immiscible with water at a temperature within the range of from 100.degree. to 220.degree. C.

Method of preparing polyimides

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Moscow, Russia

Svetlana Vasilievna Vinogradova