Method of making hydroxy-substituted hydroxylamines and color de

Details Method of making hydroxy-substituted hydroxylamines and color de Method of making hydroxy-substituted hydroxylamines and color de

1998-09-15

2000-02-22

Barts, Samuel

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

Organic compounds

Amino nitrogen containing

564409, 564413, 564453, 564454, 564487, C07C21300

Patent

active

060282258

ABSTRACT:
Hydroxy-substituted hydroxylamine antioxidants can be prepared by reacting hydroxylamine or a mono-substituted hydroxylamine, in free base form, with an epoxide. The antioxidant reaction product can be used without isolation from the reaction solution, and combined with a color developing agent to provide a photographic color developing composition in either concentrated or working strength formulations. The method for preparing the antioxidant is rapid and efficient because of the use of the free base form of the hydroxylamine reactant, higher temperatures (at or above 50.degree. C.) and certain molar ratios of reactants.

REFERENCES:
patent: 4892804 (1990-01-01), Vincent et al.
patent: 5354646 (1994-10-01), Kobayashi et al.
patent: 5508155 (1996-04-01), Marrese et al.

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