Method for preventing coloration of aromatic isocyanate...

Details Method for preventing coloration of aromatic isocyanate... Method for preventing coloration of aromatic isocyanate...

C - Chemistry, Metallurgy

07

C

C07C 263/18 (2006.01) C07C 265/14 (2006.01) C07F 9/145 (2006.01)

Patent

CA 2077632

METHOD FOR PREVENTING COLORATION OF AROMATIC ISOCYANATE COMPOUNDS ABSTRACT OF THE DISCLOSURE A method for preventing coloration of an aromatic isocyanate compound, which is characterized in that an organic phosphite ester of formula: Image wherein R1, R2, R3 and R4 are, the same or different, each a C4-20 hydrocarbon group, 2,6-di-tert.-butyl-4-methylphenol and triphenyl phos- phite are added to the aromatic isocyanate compound. SBU 54

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