C - Chemistry – Metallurgy – 08 – G
Patent
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.
397564
Hammen Gunther
Heitkamper Peter
Knofel Hartmut
Penninger Stefan
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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