申请人:SUMITOMO BAYER URETHANE CO., LTD.
公开号:EP0531803A2
公开(公告)日:1993-03-17
A method for preventing coloration of an aromatic isocyanate compound, which is characterized in that an organic phosphite ester of formula:
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 phosphite are added to the aromatic isocyanate compound.
一种防止芳香族异氰酸酯化合物着色的方法,其特征在于:式中的有机亚磷酸酯:
其中 R¹、R²、R³ 和 R⁴ 相同或不同,各自为 C₄₋₂₀烃基、
在芳香族异氰酸酯化合物中加入 2,6-二叔丁基-4-甲基苯酚和亚磷酸三苯酯。