Process for the production of polyisocyanates

Details Process for the production of polyisocyanates Process for the production of polyisocyanates

1985-02-21

1986-07-01

Torrence, Dolph H.

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

Organic compounds

Isocyanate esters

560359, 564333, C07C11802

Patent

active

045979090

ABSTRACT:
The present invention is directed to a process for the production of polyamines of the diphenylmethane series having a high diamine content and a low 2,2'-diamino-diphenylmethane content by condensing aniline with formaldehyde in the presence of hydrochloric acid as catalyst, neutralizing the acid catalyst at the end of the condensation reaction and working up the polyamine mixture thus obtained by distillation, characterized in that

REFERENCES:
patent: 3367969 (1968-02-01), Perkins
patent: 4259526 (1981-03-01), Dunlap et al.

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