Patent · US Expired

Process for the preparation of organic polyisocyanates containing urea groups

US4292255A · kind A · utility

14Cited by

4References

7Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Hans-Joachim Hennig · Leverkusen, DE
Peter Ziemek · Cologne, DE
Erhard Schellmann · Cologne, DE

Key dates

Filing date	Dec 5, 1980
Grant date	Sep 29, 1981
Priority date	—
Expiry date	Dec 5, 2000

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/8038
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to a process for the preparation of compounds selected from the group consisting of a polyisocyanate containing urea groups and a polyisocyanate containing biuret groups comprising PA0 (a) introducing an organic polyisocyanate into a reaction vessel, and PA0 (b) injecting an organic polyamine containing at least two primary amino groups into the organic polyisocyanate in the reaction vessel at a pressure of from about 2 to 1000 bar through a straight jet nozzle having an internal diameter of from about 0.01 to 5 mm wherein PA0 (i) the polyisocyanate/polyamine NCO/NH.sub.2 molar ratio is at least about 4:1 and PA0 (ii) the temperature in the reaction vessel is between about -20.degree. C. to 250.degree. C.

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