Process for making 4,4'-methylene diphenyl diisocyanate

Details Process for making 4,4'-methylene diphenyl diisocyanate Process for making 4,4'-methylene diphenyl diisocyanate

1980-09-29

1981-10-27

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453AM, 544180, 564331, 564333, C07C11802, C07C119048

Patent

active

042972949

ABSTRACT:
A novel process for making 4,4'-methylene diphenyl diisocyanate and corresponding oligomer in improved selectivity and yield comprises condensing formaldehyde and aniline under neutral or basic conditions to yield an anil condensate, followed by reacting the anil condensate with additional aniline and a protonic salt of aniline to yield 4,4'-methylene dianiline and corresponding oligomer, then followed by conventional phosgenation.

REFERENCES:
patent: 2818433 (1957-12-01), Erickson
patent: 2974168 (1961-03-01), Sharp et al.
patent: 3476806 (1969-11-01), Wolf
patent: 3676497 (1972-07-01), Recchia et al.

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