Discoloration inhibitors for aromatic amines

Details Discoloration inhibitors for aromatic amines Discoloration inhibitors for aromatic amines

1987-05-11

1989-08-29

Warren, Charles F.

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

Organic compounds

Amino nitrogen containing

C07C 8526, C07C 8758, C07C 8756

Patent

active

048619140

ABSTRACT:
Substituted aromatic amines or mixtures thereof containing a discoloration inhibiting amount of a substituted phenol having the structure: ##STR1## or mixtures of such substituted phenols wherein R.sub.1 and R.sub.2 are independently selected alkyl, cycloalkyl, aryl, aralkyl, or alkaryl and p is 0 to 4.
A method and composition are provided for inhibiting discoloration of alkylated aromatic amines and diamines. A minor portion of the substituted phenol is combined with a fresh, water white substituted aromatic amine of structure ##STR2## or mixtures thereof wherein m is 1 or 2, n is 1 to 5, m+n is not greater than 6, and the R are independently selected alkyl, cycloalkyl, aryl, aralkyl or alkaryl, said amine being subject to gradual discoloration, and a minor amount by weight of a substituted phenol or mixture of substituted phenols to inhibit color degradation.

REFERENCES:
patent: 2410829 (1946-11-01), Luten
patent: 2410847 (1946-11-01), Walters
patent: 2411307 (1946-11-01), Walters
patent: 2552466 (1951-05-01), Sweeney
patent: 2637636 (1953-05-01), Walters
patent: 3222310 (1965-12-01), Hinckley
patent: 4306985 (1981-12-01), Walters

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