Process for the preparation of an aryl mono-, di-, and/or...

Details Process for the preparation of an aryl mono-, di-, and/or... Process for the preparation of an aryl mono-, di-, and/or...

C - Chemistry, Metallurgy

08

G

260/468.5

C08G 18/70 (2006.01) C07C 271/06 (2006.01)

Patent

CA 1121374

PROCESS FOR THE PREPARATION OF AN ARYL MONO, DI-, AND/OR POLYURETHANE Abstract of the Disclosure A process for the preparation of an aryl-mono and/or polyurethane comprising the steps of A. reacting a primary aromatic mono, di-, and/or polyamine with an O-alkyl carbamate in the presence of alcohol and catalysts, and B. separating the ammonia and other by-products from the aliphatic and/or cycloaliphatic di- and/or poly- urethane. The reaction is preferably carried out in the presence of urea. The aryl mono-, di-, and/or polyurethanes produced are valuable end and intermediate products. They can be transferred into the corresponding isocyanates which can then be used for the preparation of polyurethanes.

349798

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