Process for the preparation of n- and o-substituted...

Details Process for the preparation of n- and o-substituted... Process for the preparation of n- and o-substituted...

C - Chemistry, Metallurgy

08

G

260/468.7

C08G 18/70 (2006.01)

Patent

CA 1207334

PROCESS FOR THE PREPARATION OF N- AND O-SUBSTITUTED DIURETHANES AND/OR POLYURETHANES ABSTRACT OF THE DISCLOSURE Low molecular weight N- and O-substituted diure- thanes and/or polyurethanes are prepared by reacting a diamine and/or polyamine containing a primary amino group with an N-aryl-0-alkyl urethane in the presence of at least one high boiling alcohol. This reaction may be carried out at a temperature of from 180 to 350°C and a pressure of approximately 0.1 to 1,500 mbar. The aryl- amine corresponding to the N-aryl-0-alkyl urethane which forms during this reaction is continuously removed from the reaction mixture.

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