Method for preventing coloration of aromatic isocyanate compound

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

1992-09-03

1993-11-02

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

524710, 560331, 560358, 560359, C07C26318

Patent

active

052585484

ABSTRACT:
A method for preventing coloration of an aromatic isocyanate compound, which is characterized in that an organic phosphite ester of formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are, the same or different, each a C.sub.4-20 hydrocarbon group, 2,6-di-tert.-butyl-4-methylphenol and triphenyl phosphite are added to the aromatic isocyanate compound.

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