Patent · US Expired

Polyisocyanates which contain carbodiimide groups and which are stable in storage

US4294719A · kind A · utility

53Cited by

0References

19Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Kuno Wagner · Leverkusen, DE
Hans-Dieter Block · Cologne, DE
Walter Schafer · Leichlingen, DE

Key dates

Filing date	Aug 8, 1977
Grant date	Oct 13, 1981
Priority date	—
Expiry date	Aug 8, 1997

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2110/0083
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to stable equilibrium mixtures of carbodiimides, uretone imines and organic isocyanates and to stable solutions of carbodiimides and uretone imines in polyisocyanates which are free from carbodiimide groups. Either the carbodiimide, or the uretone imine, or both, may contain isocyanate groups. The present invention also relates to a process for the preparation of such products by "heterogeneous catalysis" and the use thereof for the production of polyurethane resins. According to one embodiment of the process according to the instant invention, individual isocyanates in a mixture of various isocyanates may be carbodiimidized selectively.

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