| abstract |
(57) [Summary] [Object] To provide a method for preventing coloration of an aromatic isocyanate compound having a good coloration-preventing effect. [Structure] The aromatic isocyanate compound has the general formula: [In the formula, R 1 , R 2 , R 3 and R 4 are the same or different and each is a C 4 to C 20 hydrocarbon group. ] The coloring prevention method of the aromatic isocyanate compound characterized by adding the organic phosphite represented by these, 2,6-di-tert-butyl-4-methylphenol, and triphenyl phosphite. |