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:
Aug. 19, 1980
Filed:
May. 09, 1979
Mikhail G Brusilovsky, Moscow, SU;
Valentin P Krasnokutsky, Zagorsk, SU;
Galina I Nemtinova, Moscow, SU;
Evgeny N Novozhilov, Moscow, SU;
Viktor A Pekarsky, Ljubertsy Moskovskoi oblasti, SU;
Svetlana A Platonova, Bykovo Moskovskoi oblasti, SU;
Alexandr S Tumansky, Moscow, SU;
Other;
Abstract
A method for preparing biuret-structure polyisocyanates which comprises reacting 1,6-hexamethylenediisocyanate with water which is introduced into the reaction zone in the form of vapors in a mixture with air or an inert gas at a moisture content of said mixture of from 0.1 to 2.0 kg/kg and temperature of from 110.degree. to 130.degree. C. The reaction is carried out at a temperature ranging from 150.degree. to 170.degree. C. The polyisocyanates having biuret structure as produced by the method according to the present invention have a molecular mass of about 800, the content of isocyanate groups is as high as 23.59%. No polyurea is formed in the reaction. The process is single-staged, technologically simple and can be performed continuously.