Patent · US Active

Method for producing a composition comprising polycarbodiimide having improved storage stability

US10633476B2 · kind B2 · utility

0Cited by

10References

12Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Hans-Detlef Arntz · Overath, DE
Stefan Wershofen · Mönchengladbach, DE
Ernst Felske · Neuss, DE

Key dates

Filing date	Feb 25, 2016
Grant date	Apr 28, 2020
Priority date	—
Expiry date	Feb 25, 2036

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/797
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.