Photographic bleaching compositions and method of photographic p

Details Photographic bleaching compositions and method of photographic p Photographic bleaching compositions and method of photographic p

1996-06-19

1997-12-02

Le, Hoa Van

Radiation imagery chemistry: process, composition, or product th

Nonradiation sensitive image processing compositions or...

Bleach or intensification

430393, 430430, G03C 742

Patent

active

056934564

ABSTRACT:
A bleaching composition is a mixture of two ferric complexes with two different aminopolycarboxylic acid complexing ligands. The first complex is formed of a biodegradable aminopolycarboxylic acid, and acts as the primary bleaching agent. The second complex is formed of a less biodegradable aminopolycarboxylic acid, and acts to inhibit biological growth and rust formation. The molar ratio of the first complex to the second complex is at least 2:1. The first complexing ligand is iminodiacetic acid or an alkyliminodiacetic acid. The second complexing ligand is either ethylenediaminetetraacetic acid or propylenediaminetetraacetic acid.

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patent: 5238791 (1993-08-01), Tappe et al.
patent: 5508150 (1996-04-01), Craver et al.

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