Homogeneous single-part photographic color developing concentrat

Details Homogeneous single-part photographic color developing concentrat Homogeneous single-part photographic color developing concentrat

1998-08-11

2000-06-20

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Developer

430434, 430450, 430497, G03C 7413

Patent

active

06077651&

ABSTRACT:
An aqueous, homogeneous, single-part color developing concentrate comprises a color developing agent in free base form, an antioxidant for the color developing agent, a buffering agent, and a water-miscible or water-soluble hydroxy-substituted, straight-chain organic solvent present in an a concentration such that the weight ratio of water to the organic solvent is from about 15:85 to about 50:50. This composition is prepared in a unique manner, namely by combining the noted components, and removing the sulfate anions commonly present in color developing agents by precipitation with alkali metal ions, before addition of further components. The concentrate can be used to make a working strength processing solution, or it can be used as a replenishing composition with proper dilution.

REFERENCES:
patent: 3574619 (1971-04-01), Surash
patent: 5273865 (1993-12-01), Loiacono et al.
patent: 5660974 (1997-08-01), Marrese et al.
patent: 5837435 (1998-11-01), Abe

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