Process for the production of polyisocyanates

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

1974-11-11

1976-04-20

Roberts, Elbert L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260570D, C07C11802, C07C119048

Patent

active

039520420

ABSTRACT:
A process is provided for making a mixture of diisocyanate and polyisocyanates having more than two amino groups of the diphenylmethane series which has a low content of the o-isomers wherein a mixture of aniline and a polyamine prepared by condensation of aniline and formaldehyde is condensed with formaldehyde, at least 90% of the amino groups in the mixture being protonized with an acid, and phosgenating the resulting condensation product to form corresponding polyisocyanates.

REFERENCES:
patent: 3012008 (1961-12-01), Lister
patent: 3367969 (1968-02-01), Perkins

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