A process for the preparation of highly pure aromatic...

Details A process for the preparation of highly pure aromatic... A process for the preparation of highly pure aromatic...

C - Chemistry, Metallurgy

07

C

C07C 271/28 (2006.01) C07C 263/04 (2006.01) C07C 265/14 (2006.01) C07C 269/04 (2006.01) C07C 269/06 (2006.01) C08G 18/32 (2006.01) C08G 71/04 (2006.01)

Patent

CA 2085284

Mo3814 LeA 28,779 A PROCESS FOR THE PREPARATION OF HIGHLY PURE AROMATIC DIURETHANES AND/OR POLYURETHANES ABSTRACT OF THE DISCLOSURE This invention relates to a process for the preparation of highly pure aromatic diurethanes and/or polyurethanes by reaction of the corresponding aromatic diamines and/or polyamines with unsubstituted carbamates with the release of ammonia. The reaction is carried out in the presence of excess carbamates. The resultant reaction mixture is freed from any solvents used, and the formed aromatic diurethanes and/or polyurethanes are purified by extraction with water.

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