Radiation imagery chemistry: process – composition – or product th – Color imaging process – Using identified radiation sensitive composition in the...
Patent
1987-09-23
1990-01-09
Michl, Paul R.
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Using identified radiation sensitive composition in the...
430393, 430432, 430434, 430464, 430467, 430567, G03C 730/7/26
Patent
active
048928038
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a color image-forming process, and more particularly to a color image-forming process capable of saving the coating amount of silver and capable of performing quick processing.
BACKGROUND ART
For forming color photographic images, three kinds of color forming photographic couplers, namely yellow, magenta, and cyan color forming couplers are contained in light-sensitive silver halide emulsion layers, and the layers are exposed and then processed by a color developer containing a color developing agent. In this development course, the oxidation product of the aromatic primary amine causes coupling reactions with the couplers to give colored dyes and in this case, it is necessary to give color density as high as possible in a limited developing time.
The purpose of obtaining high color density is usually attained by using couplers having a coupling speed as high as possible, by using silver halide emulsions which are liable to be developed and provide large amount of developed silver per unit coating amount, or by using a color developer showing a high developing speed.
For increasing the developing speed of a silver halide emulsion, it can be easily considered to increase the content of silver chloride in the silver halide but the increase of the content of silver chloride causes a faults that the sensitivity is reduced and fog is liable to form. Also, it may be considered to increase the aforesaid content of silver chloride or strengthen the chemical sensitization for increasing the amount of developed silver but in this case also, there is a fault that fog is liable to form. Furthermore, it is a means for quickening the development to reduce the grain size in a silver halide emulsion but such an attempt has a fatal fault that the sensitivity is lowered. Also, a process of using a silver chloride emulsion is described, for example, in unexamined Published Japanese Patent Application Nos. 95345/83, 232342/84, and 19140/85, but there is a problem that the control of the gradation is difficult.
On the other hand, on a color developer, various attempts have hitherto been made for increasing the development. In these attempts, various additives have been investigated for increasing the permeation of a color developing agent into color coupler-dispersed oil drops to accelerate coloring, and in particular, a process of quickening the color development by adding benzyl alcohol to a color developer has been widely used for the processing of color photographic light-sensitive materials, particularly color photographic papers since the process has a high coloring accelerating effect.
However, since benzyl alcohol has low water-solubility, in the case of using benzyl alcohol it is required to use a solvent such as diethylene glycol, triethylene glycol, alkanolamine, etc. However, since the aforesaid compounds including benzyl alcohol give high BOD and COD, which are pollution-giving values, it is preferred not to use benzyl alcohol for the purpose of reducing the pollution load.
Furthermore, even in the case of using the aforesaid solvent, it takes a long period of time to dissolve benzyl alcohol in the solvent and hence for the purpose of reducing the working load for preparing the liquid, it is better not to use benzyl alcohol.
Also, when benzyl alcohol is carried in a bleach bath or a blix bath, which is a post-bath, it causes the formation of leuco dyes of cyan dyes, which results in the reduction of color density. Furthermore, the entrance of benzyl alcohol delays the washing out speed of the developer components, which sometimes gives bad influences on the image storage stability of processed light-sensitive materials. Accordingly, it is better not to use benzyl alcohol in the reasons described above.
A color development has generally been performed in from 3 minutes to 4 minutes but it has been desired to further shorten the processing time with the recent desirement for shortening the time for delivery of finished products and the reduction of laboratory works.
Howe
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Asami Masahiro
Hasebe Kazunori
Waki Kokichi
Doody Patrick A.
Fuji Photo Film Co. , Ltd.
Michl Paul R.
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