Process for the preparation of aromatic mono- and polyisocyanate

Details Process for the preparation of aromatic mono- and polyisocyanate Process for the preparation of aromatic mono- and polyisocyanate

1988-11-03

1989-10-03

Siegel, Alan

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

Organic compounds

Isocyanate esters

C07C 7100

Patent

active

048718718

ABSTRACT:
An improved process is provided for the preparation of aromatic mono- and poly- isocyanates by the thermal decomposition of an aromatic bis dialkyl urea in solvent in the presence of a tertiary amine hydrohalide, such as pyridine hydrochloride, as a promoter for conversion of the urea groups to isocyanates.

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.
Hofmann, Proc. Royal Soc. London, 9, 274 (1858).
Hofmann, Chem. Ber. 3, 653 (1870).
Iwakura et al., Bull. Tokyo Inst. Tech 13, 25 (1950); Chem. Abs. 44, 3924e (1950).
Bennet et al., J. Am. Chem. Soc. 75, 2101 (1952).

Affiliated with

Also associated with

Rating

Process for the preparation of aromatic mono- and polyisocyanate does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of aromatic mono- and polyisocyanate, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of aromatic mono- and polyisocyanate will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-665814