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

1994-10-13

1996-01-16

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521113, 521128, 521130, 521159, 521170, C08G 1870

Patent

active

054848199

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: 4465639 (1984-08-01), Hatfield, Jr.
patent: 4792624 (1988-12-01), Hatfield, Jr. et al.
patent: 5312971 (1994-05-01), Adkins et al.

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