Photographic bleach compositions and methods of photographic pro

Details Photographic bleach compositions and methods of photographic pro Photographic bleach compositions and methods of photographic pro

1993-09-22

1994-08-02

Van Le, Hoa

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Using identified radiation sensitive composition in the...

430430, 430461, G03C 742

Patent

active

053344910

ABSTRACT:
Bleach compositions and methods that are improvements over those provided by Fyson, U.S. Pat. No. 4,294,914, are disclosed. A highly preferred bleach composition of this invention (a) has the ferric complex of methyliminodiacetic acid as a bleaching agent, and additionally comprises (b) at least 0.9 mole of acetic acid per liter, (c) from about 15 to about 35 grams per liter of potassium bromide; and (d) has a pH of from about 2.5 to about 4.0.
This invention includes the discovery of a synergistic bleaching coaction of a bleach (i) comprising an alkyliminodiacetic acid such as methyliminodiacetic acid, and (ii) which has a pH of from about 3.5 to about 4.5 , and (iii) in which the amount of ferric iron is from about 2 to about 16 grams per liter. This coaction between iron levels and pH was previously unknown and was unexpected.
Bleach formulations of this invention can be used in the processing of color photographic materials, such as film.

REFERENCES:
patent: 4242442 (1980-12-01), Idota et al.
patent: 4268618 (1981-05-01), Hashimura
patent: 4294914 (1981-10-01), Fyson
patent: 4444673 (1984-04-01), Ishikawa
patent: 4780398 (1988-10-01), Kim
patent: 4822725 (1989-04-01), Abe et al.
patent: 5061608 (1991-10-01), Foster et al.
patent: 5070004 (1991-12-01), Fujita et al.
patent: 5147765 (1992-09-01), Goto et al.

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