Process for preparing polyamines for lighter color polyisocyanat

Details Process for preparing polyamines for lighter color polyisocyanat Process for preparing polyamines for lighter color polyisocyanat

1991-12-10

1995-01-31

Hollrah, Glennon H.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564333, 564334, C07C20978

Patent

active

053860594

ABSTRACT:
The present invention encompasses an improved process for preparing polymethylene polyphenyl polyisocyanate comprising reacting phosgene with polymethylene polyphenyl polyamine, the improvement wherein the polymethylene polyphenyl polyamine is acidified prior to phosgenation.

REFERENCES:
patent: 3952042 (1976-04-01), Knofel
patent: 4465639 (1984-08-01), Hatfield, Jr.
patent: 4792624 (1988-12-01), Hatfield, Jr. et al.
patent: 5173521 (1992-12-01), Ishino
patent: 5196591 (1993-03-01), Knofel et al.
patent: 5286760 (1994-02-01), Bolton et al.
patent: 5310769 (1994-05-01), Konig et al.

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