Preparation of polymethylene polyphenyl polyisocyanate

Details Preparation of polymethylene polyphenyl polyisocyanate Preparation of polymethylene polyphenyl polyisocyanate

1991-05-15

1992-08-04

Dees, Jose G.

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

Organic compounds

Isocyanate esters

560338, 560347, C07C26310

Patent

active

051360870

ABSTRACT:
Disclosed herein is an improved process for the preparation of polymethylene polyphenyl polyisocyanate by reacting phosgene with a corresponding polyamine, followed by removing residual phosgene from the reaction mixture, the improvement comprising removing the residual phosgene by contacting the reaction mixture which is maintained at 150 degrees Centigrade or lower, with an inert solvent vapor stream at a temperature which is sufficient to effect a substantially complete removal of the residual phosgene.

REFERENCES:
patent: 4193932 (1980-03-01), Yamamoto et al.
patent: 4372891 (1983-02-01), Hilbert et al.
patent: 4465639 (1984-08-01), Hatfield, Jr.
patent: 4792624 (1988-12-01), Hatfield, Jr. et al.
patent: 4876380 (1989-10-01), Chen et al.

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