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CAPLUS COPYRIGHT 2011 ACS
||Preparation of isocyanates from polyureas formed by polyamine and urea
||Kloetzer, Matthias; Stroefer, Eckhard; Blankertz, Heinrich-Josef
||BASF A.-G., Germany
||PCT Int. Appl., 30pp. CODEN: PIXXD2
Organic, distillable polyisocyanates, preferably diisocyanates, especially preferred aliphatic or cycloaliph. diisocyanates, are prepared continuously by reacting the corresponding organic polyamines with urea to give low-mol. monomeric polyureas, and subsequently thermally decomposing the polyureas.
Please note: Titles for patent records in CAplus are routinely enhanced to better describe the claimed invention. In this example, CAS enhanced the title using additional information found in the patent. The original title of the U.S. granted patent is Method for producing isocyanates. For the CAplus record, this title was enhanced to read Preparation of isocyanates from polyureas formed by polyamine and urea.
View the full-text U.S. patent from USPTO.