Improved polymeric mdi color

Details Improved polymeric mdi color Improved polymeric mdi color

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 2252749

A process for the production of polymethylene polyphenyl polyisocyanates is disclosed. The process comprises phosgenating the corresponding polyamines in solution in an inert organic solvent, removing excess phosgene, and stripping the solvent, the improvement wherein at least 0.00015 percent by weight of hydrazine or hydrazine derivative per 100 percent by weight of polyamine are added to the polyamines at any time prior to the stripping step.

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