The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 1980
Filed:
Jul. 29, 1977
Vadim B Igonin, Vladimir, SU;
Vladimir Z Nikonov, Vladimir, SU;
Lev B Sokolov, Vladimir, SU;
Valentin M Savinov, Vladimir, SU;
Vitaly A Vasiliev, Vladimir, SU;
Vladimir M Ivanov, Vladimir, SU;
Vladimir A Nikiforov, Kalinin, SU;
Savely A Zhizhilev, Kalinin, SU;
Tatyana I Nikitina, Kalinin, SU;
Lidia A Klimenko, Kalinin, SU;
Olga I Mischenko, Kalinin, SU;
Other;
Abstract
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.