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:
Apr. 28, 2020
Filed:
Feb. 25, 2016
Covestro Deutschland Ag, Leverkusen, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
A method for producing a composition comprising polycarbodiimide, comprising the step of the reaction of a reaction mixture which contains an aromatic polyisocyanate and a carbodiimidising catalyst, wherein, before the reaction, the aromatic polyisocyanate is treated at a temperature of ≥80° C. to ≤150° C. and a pressure of ≥1 mbar to ≤500 mbar by passing through an inert gas and/or during the reaction, the reaction mixture is treated at a temperature of ≥80° C. to ≤150° C. and a pressure of ≥1 mbar to ≤500 mbar by passing through an inert gas and wherein the content of hydrolysable chlorine in the reaction mixture is ≤10 ppm.