Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Patent
1992-07-23
1994-05-17
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
560 25, 560331, 560333, 560352, C07C26310, C07C26318
Patent
active
053129717
ABSTRACT:
The present invention is directed to a process for the production of polymethylene polyphenyl polyisocyanates by phosgenating the corresponding polyamines in solution in an inert organic solvent, removing excess phosgene, and stripping the solvent. The improvement resides in adding at least 0.02 parts by weight of reducing agent per 150 parts by weight of polyamine to the polyamines at any time prior to the stripping step.
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Adkins Rick L.
Blue Clarence D.
Brown N. Denise
Clarke Vera C.
Dees Jos,e G.
Gil Joseph C.
Miles Inc.
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