Radiation imagery chemistry: process – composition – or product th – Silver halide colloid tanning process – composition – or product
Patent
1996-07-26
1999-02-09
Chea, Thorl
Radiation imagery chemistry: process, composition, or product th
Silver halide colloid tanning process, composition, or product
430440, 430446, 430480, 430484, 430485, G03C 529, G03C 106
Patent
active
058692185
ABSTRACT:
Disclosed are an image formation process which comprises developing a photographic material comprising a silver halide emulsion layer, and a hydrazine derivative and a specific phosphonium compound of formula (1) with a developer which is substantially free of a dihydroxybenzene developing agent, contains a specific developing agent of formula (2) and at least one p-aminophenol derivative, and has a pH value of not more than 10, and a development process which comprises developing a photographic material comprising a silver halide emulsion layer, and a hydrazine derivative and a nucleation accelerator, with a developer having a pH value of from 9.0 to 10.5 and containing a first developing agent selected from ascorbic acid and a derivative thereof and a second developing agent selected from aminophenol and a derivative thereof, wherein a solution having the same composition as the fresh developer but a higher pH value than the fresh developer is used as a development replenisher. The image formation process enables the formation of a high contrast image desirable in the field of graphic arts with a stable developer which is unharmful to an ecosystem or working atmosphere and shows an extremely small deterioration with time, and the development process is useful for a plate-making silver halide photographic material, accomplishes an ultrahigh contrast, minimizes the pH variation during running processing, and reduces the burden on environment.
REFERENCES:
patent: 4699873 (1987-10-01), Takahashi et al.
patent: 4929535 (1990-05-01), Takahashi et al.
patent: 5503965 (1996-04-01), Okutsu
patent: 5578433 (1996-11-01), Morishima et al.
patent: 5587276 (1996-12-01), Katoh
Katoh Kazunobu
Sakai Minoru
Chea Thorl
Fuji Photo Film Co. , Ltd.
LandOfFree
Image formation process does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image formation process, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image formation process will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1947432