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Kalininsky Politekhnichesky Institut Ussr

Tatyana I Nikitina

Lev B Sokolov

Vladimir A Nikiforov

Savely A Zhizhilev

Nison I Gelperin

Alexandr G Mukhometzyanov

Valentin M Savinov

Vadim B Igonin

Vitaly A Vasiliev

Olga I Mischenko

Vladimir Z Nikonov

Lidia A Klimenko

Vladimir M Ivanov

Viktor I Rabinovich

Vikior I Rabinovich

Fibrides of synthetic heterochain polymers are produced by a non-equilibrium polycondensation of an aqueous alkaline solution of bifunctional compounds supplied into the reaction zone as a continuous stream oriented in the horizontal plane of the reaction zone to be acylated with diacyl chlorides of dicarboxylic acids in the state of a superheated vapor with a carrier supplied into the reaction zone in the vertical plane, contacting the reagents being effected in a cross-current stream under shear stress conditions. An apparatus employed for carrying out the process for producing fibrides of synthetic heterochain polymers includes a vertically mounted cylindrical housing comprising a reaction chamber provided with means for admitting of the liquid phase of the starting products thereinto as a continuous flow oriented in the horizontal plane of reaction chamber; a chamber for generating the gas phase of the starting products positioned under the reaction chamber, and means for removing the reaction products from the reaction chamber provided in the upper part of the latter. The present invention is useful in the manufacture of synthetic paper for electroengineering applications, in aviation engineering, fuel filters for diesel engines, in the production of plastics, and non-woven materials in the textile and light industries.

Apparatus for producing fibrides of synthetic heterochain polymers

Fibrides of synthetic heterochain polymers are produced by a non-equilibrium polycondensation of an aqueous alkaline solution of bifunctional compounds supplied into the reaction zone as a continuous stream oriented in the horizontal plane of the reaction zone to be acylated with diacylchlorides of dicarboxylic acids in the state of a superheated vapor with a carrier supplied into the reaction zone in the vertical plane, the contacting of the reagents being effected in a cross-current stream under shear stress conditions. An apparatus employed for carrying out the process for producing fibrides of synthetic heterochain polymers includes a vertically mounted cylindrical housing comprising a reaction chamber provided with means for admitting the liquid phase of the starting products thereinto as a continuous flow oriented in the horizontal plane of the reaction chamber; a chamber for generating the gas phase of the starting products positioned under the reaction chamber, and means for removing the reaction products from the reaction chamber provided in the upper part of the latter. The present invention is useful in the manufacture of synthetic paper for electroengineering applications, in aviation engineering, fuel filters for diesel engines, in the production of plastics, and non-woven materials in the textile and light industries.

Gas/liquid interfacial preparation of polyamide fibrids

A method for preparing heterochain polymers, viz. polyamides or polyarylates which comprises an interphase polycondensation of diamines or bisphenols with dihaloanhydrides of dicarboxylic acids; said interphase polycondensation is performed by atomization of dihaloanhydrides of dicarboxylic acids in the form of an aerosol by means of a compressed gas into an aqueous solution of said diamines or bisphenols; concentration of said dihaloanhydrides of dicarboxylic acids in the aerosol is maintained within the range of from 0.4.times.10.sup.-4 to 2.times.10.sup.-4 mol/l of the gas; dihaloanhydrides of dicarboxylic acids which are solid under normal conditions are melted or dissolved prior to the atomization in organic solvents which are inert with respect to said dihaloanhydrides of dicarboxylic acids to a concentration of from 5 to 20 mol/l of the solvent; dihaloanhydrides of dicarboxylic acids which are liquid under normal conditions are fed directly to atomization; the desired product is then isolated from the suspension resulting from the interphase polycondensation. The method of the present invention makes it possible to substantially reduce (by 10 to 40 times) the consumption of an organic solvent or totally avoid its use in the process. It also makes possible to produce polymers in the form of fibrides thus making more simple and efficient the manufacture of synthetic paper and filter materials. The method of the present invention is technologically simple and can be performed both by a continuous and a periodic scheme.

Method for preparing heterochain polymers

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Tatyana I Nikitina