Process for the preparation of methylene diphenylene diisocyanat

Details Process for the preparation of methylene diphenylene diisocyanat Process for the preparation of methylene diphenylene diisocyanat

1988-12-09

1989-10-10

Siegel, Alan

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

Organic compounds

Isocyanate esters

C07C11800

Patent

active

048733644

ABSTRACT:
An improved process is provided for the preparation of methylene diphenylene diisocyanates (MDI) and polymethylene polyphenylene poly (diisocyanates) by the thermal decomposition of a methylene diphenylene bis (dialkylurea) or a polymethylene polyphenylene poly (dialkylurea) in a solvent in the presence of a tertiary amine hydrohalide, such as pyridine hydrochloride, as a promoter for conversion of the urea groups to the corresponding isocyanate.

REFERENCES:
patent: 2773086 (1956-12-01), Slocombe et al.
patent: 3898259 (1975-08-01), Hearsey
patent: 3936484 (1976-02-01), Rosenthal et al.
patent: 4223145 (1980-09-01), Hentschel et al.
patent: 4223145 (1980-09-01), Hentschel et al.
Hofmann, Proc. Royal Soc., London, 9, 274 (1858).
Bennet et al., J. Am. Chem. Soc., 75, 2101 (1952).

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