Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...
Patent
1991-08-02
1995-03-28
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Using identified radiation sensitive composition in the...
430372, 430428, 430429, 430430, 430455, 430460, G03C 700, G03C 538, G03C 1100, G03C 518
Patent
active
054016215
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process and composition for the processing of a silver halide photographic material. More particularly, the present invention relates to a process for processing a silver halide photographic material which provides excellent desilvering properties and a processing composition therefor. Further, the present invention relates to a process for processing a silver halide photographic material which is little subject to thermostain on the material after processing and provides excellent desilvering properties and a processing composition therefor.
Moreover, the present invention relates to a process for processing a silver halide color photographic material which is little subject to bleach fogging caused by blix and provides an excellent solution stability and a processing composition therefor.
BACKGROUND ART
In general, the processing of a silver halide color photographic material consists of steps of color development and desilvering. Silver which has been produced in the development step is then oxidized with a bleaching agent and dissolved with a fixing agent. As bleaching agent there may be mainly used a, ferric complex salt, e.g., aminopolycarboxylic acid-ferric complex salt. As fixing agent there may be normally used a thiosulfate.
On the other hand, the processing of a black-and-white photographic light-sensitive material consists of steps of development and removal of unexposed silver halide. Unlike the processing of a color photographic light-sensitive material, the black-and-white photographic light-sensitive material which has been developed is then fixed without being bleached. In this case, too, as fixing agent there is normally used a thiosulfate.
It has been desired to speed up both the color development and the black-and-white development. It has thus been studied to shorten each processing step. This doesn't except the fixing step. Various fixing accelerators have been studied. Little or no effective fixing accelerators have been found. It is possible to use fixing agents other than thiosulfates to-speed up the fixing step.
Examples of fixing agents to replace thiosulfates include 1,2,4-triazolium-3-thiolates of mesoionic compounds as described in U.S. Pat. No. 4,378,424, and JP-A-57-150842 (the term "JP-A" as used herein means an "unexamined published Japanese patent application"). However, no full studies have been made on these fixing agents.
JP-A-1-201659 discloses the use of mesoionic compounds as bleach accelerators in the bleaching bath or blix bath. Further, JP-A-2-44355 discloses the use of 1,2,4-triazolium-3-thiolate compounds as fixing accelerators in the fixing bath. However, the above cited patents give no reference to the effects of the present invention.
Other examples of mesoionic compounds include those disclosed in U.S. Pat. Nos. 4,003,910, 4,675,276, 4,624,913, and 4,631,253, and JP-A-62-217237, JP-A-64-3641, JP-A-60-144737, JP-A-62-253161, JP-A-62-287239, JP-A-61-176920, JP-A-62-96423, and JP-A-1-154056. However, all these mesoionic compounds are intended to be incorporated in the photographic light-sensitive material or the developer. The above cited patents give no reference to the effects of the present invention.
There is an increasing demand for the improvement in the image preservability. For this purpose, studies have been made on both the material to be used in the light-sensitive material and the final processing bath. However, these approaches still leave much to be desired. Thus, there have been not yet attained desired desilvering properties and image preservability. It has thus been desired to drastically improve these properties.
Further, the above mentioned bleaching agent and fixing agent are used in the same bath as blix bath in the processing of a color photographic paper, etc., for the purpose of speeding up the processing. The bleaching agent to be used in the blix bath is normally an ethylenediaminetetraacetic acid-ferric complex salt. It is the recent tendency that an oxidizing agent having a high
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U.S. Statutory Invention Registration H953, Aug. 1991, Goto et al., Research Disclosure 20430, pp. 159-160, Apr. 1981.
Kojima Tetsuro
Watanabe Nobuo
Bowers Jr. Charles L.
Fuji Photo Film Co. , Ltd.
Pasterczyk J.
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