Process for preparing polymethylene-polyphenyl polyisocyanates

Details Process for preparing polymethylene-polyphenyl polyisocyanates Process for preparing polymethylene-polyphenyl polyisocyanates

1980-12-01

1981-12-22

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

560 25, C07C11800

Patent

active

043070299

ABSTRACT:
A process for preparing polymethylene polyphenyl polyisocyanates, in which N-phenyl carbamic acid esters are subjected to a condensation reaction with formaldehyde, and the reaction product containing polymethylene polyphenyl polycarbamic acid esters and unreacted N-phenyl carbamic acid esters is thermally decomposed to obtain polymethylene polyphenyl polyisocyanates.

REFERENCES:
patent: 2409712 (1946-10-01), Schweitzer
patent: 3870739 (1975-03-01), DeLaMater et al.
patent: 3919278 (1975-11-01), Rosenthal
patent: 4081472 (1978-03-01), Tsumura et al.
patent: 4146727 (1979-03-01), Shawl et al.
patent: 4163019 (1979-07-01), Mango
J. Am. Chem. Soc., 78, 1946 (1956).
Bull, Chem. Soc., Japan, 33, 1137 (1960).

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