Radiation imagery chemistry: process – composition – or product th – Nonradiation sensitive image processing compositions or... – Bleach or intensification
Patent
1986-08-28
1988-10-25
Michl, Paul R.
Radiation imagery chemistry: process, composition, or product th
Nonradiation sensitive image processing compositions or...
Bleach or intensification
430431, 430460, 430462, G03C 538
Patent
active
047803983
ABSTRACT:
A bleaching composition for color photographic materials consists essentially of an aqueous solution containing a complex of ferric ion and an aminopolycarboxylic acid or salt thereof; a mercapto-substituted 5-membered heterocyclic nitrogen compound having at least two nitrogen atoms; and a vinyl pyrrolidone polymer selected from the group consisting of poly-N-vinyl pyrrolidone and an alkyl-substituted poly-N-vinyl pyrrolidone.
Use of the novel bleaching composition in the bleaching process for color photographic materials results in a substantial reduction in bleaching time while preventing the formation of a precipitate during the process. Further, use of the bleaching composition and process permits a significant reduction in the amounts of bleaching agent and other components of the bleaching solution required where the bleaching time is not critical which results in a substantial cost reduction. In addition, the more complete silver removal achieved provides processed color photographic materials having improved quality.
REFERENCES:
patent: 3880660 (1975-04-01), Ishihara et al.
patent: 3893858 (1975-07-01), Wabnitz, Jr.
patent: 4040837 (1977-08-01), Sakamoto et al.
patent: 4138256 (1979-02-01), Fushiki et al.
patent: 4546070 (1985-10-01), Kishimoto et al.
Buscher Mark R.
Haglind James B.
Michl Paul R.
Olin Hunt Specialty Products Inc.
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