Color reduction of polymethylene polyphenyl polyisocyanates

Details Color reduction of polymethylene polyphenyl polyisocyanates Color reduction of polymethylene polyphenyl polyisocyanates

C - Chemistry, Metallurgy

07

C

C07C 265/14 (2006.01) C07C 263/10 (2006.01) C07C 263/20 (2006.01) C08G 18/76 (2006.01)

Patent

CA 2098949

Mo-3820 MD-91-15-PU COLOR REDUCTION OF POLYMETHYLENE POLYPHENYL POLYISOCYANATES ABSTRACT OF THE DISCLOSURE The present invention is directed to a process for the production of polymethylene polyphenyl polyisocyanates by phosgenating the corresponding polyamines in solution in an inert organic solvent, removing excess phosgene, and stripping the solvent. The improvement resides in adding at least 0.02 parts by weight of reducing agent per 150 parts by weight of polyamine to the polyamines at any time prior to the stripping step.

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