Process for the preparation of polyisocyanates

Details Process for the preparation of polyisocyanates Process for the preparation of polyisocyanates

1982-07-12

1983-09-20

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C11802

Patent

active

044055277

ABSTRACT:
Polyisocyanates are prepared by reacting a polyamine solution with a phosgene solution. Excess phosgene and hydrogen chloride formed during the reaction are removed from the reaction mixture. The solvent is subsequently removed from the reaction mixture (e.g., by evaporation and condensation) and treated with a compound containing isocyanate reactive hydrogen atoms to convert any isocyanates present into urethanes and/or ureas. The thus-treated solvent may then be reused, preferably after any urethanes and/or ureas present in the solvent have been removed.

REFERENCES:
patent: 3835172 (1974-09-01), Arndt et al.
Ullmans Encyklopadie der Technischen Chemie, 4th Edition (1977), vol. 13, pp. 350 et seq.

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