Process for the preparation of isocyanates or isocyanate...

Details Process for the preparation of isocyanates or isocyanate... Process for the preparation of isocyanates or isocyanate...

C - Chemistry, Metallurgy

07

C

C07C 263/20 (2006.01) C07C 263/10 (2006.01) C07C 265/14 (2006.01) C08G 18/70 (2006.01) C08G 18/71 (2006.01)

Patent

CA 2092623

Mo-3865 LeA 28,819 PROCESS FOR THE PREPARATION OF ISOCYANATES OR ISOCYANATE MIX- TURES AND THEIR USE FOR THE PREPARATION OF POLYURETHANE FOAMS ABSTRACT OF THE INVENTION Isocyanates or isocyanate mixtures which are substantially free of color-imparting components are made by treating the isocyanate with hydrogen in the presence of a catalyst at a pressure of from about 3 to about 150 bar, a temperature of from about 100 to about 180°C for from about 15 minutes to about 4 hours. These isocyanates are particularly useful for the preparation of light-colored polyurethane rigid foams. Le A 28 819-Foreign Countries

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