To obtain a high-quality organic isocyanate compound by adding a specific three component-based discoloration inhibitor to the compound, useful as a raw material for an elastic material, a foam, an adhesive, etc., while effec tively preventing discoloration.
The method for preventing discoloration of an organic isocyanate compound comprises blending (A) an organic isocyanate compound with (B) a compound of the formula [R1 is a 1-4C alkyl; R2 and R3 are each a group of the formula C(CH3)2-R' (R' is a 1-5C alkyl or phenyl); R4 is H or methyl) {e.g. 2-[1-(2-hydroxy-3,5-di-tert-pentylphenyl)ethyl]-4,6-di-tert-pentylphenyl acrylate} (B1), 2,6-di-tert-butyl-4-ethylphenol (B2) and triphenyl phosphite (B3) in the ratio of 100 pts.wt. of the component A, 0.005 pt.wt., especially 0.01-0.05 pt.wt. of the component B1, the component B2 and the component B3, respectively.
MURATA NAOHIRO
ISHIKAWA KEIKO
TANIGUCHI TOSHIYUKI
TAKAYANAGI HIROSHI
