Manufacture of 4,4'-diphenylmethane diisocyanate and a mixture o

Details Manufacture of 4,4'-diphenylmethane diisocyanate and a mixture o Manufacture of 4,4'-diphenylmethane diisocyanate and a mixture o

1974-10-25

1977-03-29

Gotts, Lewis

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260453AM, 260570D, C07C11902

Patent

active

040149145

ABSTRACT:
Production of 4,4'-diphenylmethane diisocyanate and a mixture of diisocyanates and polyisocyanates by the phosgenation of pure 4,4'-diaminodiphenylmethane and a mixture of diamines and polyamines. 4,4'-Diaminodiphenylmethane is obtained by distillation of the mixture of products obtained from the reaction of aniline with formaldehyde and crystallization of the distillate from a solvent. The combined distillation residue and mother liquor from the crystallization form the mixture for reaction with phosgene to produce a mixture of diisocyanates and polyiisocyanates. This process produces a highly pure 4,4'-diphenylmethane diisocyanate which is particularly suitable for the production of polyurethanes serving as intermediates in the manufacture of rigid foams or as glue.

REFERENCES:
patent: 3542871 (1970-11-01), Thompson

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