Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Two or more radiation-sensitive layers containing other than...
Reexamination Certificate
2002-09-26
2004-11-09
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Two or more radiation-sensitive layers containing other than...
C430S502000, C430S503000, C430S567000, C430S599000, C430S604000, C430S605000
Reexamination Certificate
active
06815152
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a silver halide color photographic photosensitive material, and particularly to a silver halide color photographic photosensitive material that is preferably used as a cinematographic color photographic photosensitive material, exhibits high image quality, and is excellent in storage stability and processing stability.
2. Description of the Related Art
Silver halide color photographic photosensitive materials used for viewing, recording and storing dye images have been always desired to have high image quality, and numerous studies therefor have been conducted.
Motion picture, which is one application of silver halide photography, is a method for obtaining a moving picture by projecting sequentially 24 precise, still pictures per second and has overwhelmingly high image quality in comparison to other methods for obtaining the moving picture. However, the recent rapid progress in electronic and information processing techniques has provided in such a simple reproduction technique for moving picture that has high image quality approaching the motion picture, for example, a projector using a DMD device produced by Texas Instruments, Inc., and an ILA projector produced by Hughes JVC Technology Corp. Therefore, the current situation is that motion picture is further demanded to have higher image quality, ease of handling and a quickened developing (time saving).
It is necessary that photosensitive materials, particularly those used for projection (color positive films for motion picture), have high image quality since they are directly viewed by the users through movie-projectors, and are produced with the quickened developing and an even performance, wherein the high image quality and the quickened development processing are stable, since it is necessary to produce the material in large amounts for viewing in movie theaters around the world.
In order to quicken developing process, shortening of a developing time of the silver halide photographic photosensitive material has been considered an important problem, and various studies have been conducted for silver halide emulsions having a fast developing rate, a couplers having a high coupling activity, and processing agents able to develop quickly. In particular, as disclosed in U.S. Pat. No. 4,840,878, the use of a silver halide emulsion having a high silver chloride content is extremely effective for the rapid processing of color photographic photosensitive materials.
It is important that the photosensitive material have a high image quality, and exhibit a good reproducibility of scenes upon being projected on screens in theaters. The motion picture is enlarged upon projection, therefore, the photosensitive material used is required to have a fine granularity. To improve the granularity, techniques for using silver halide particles having a relatively small size are disclosed in JP-A No. 62-99751, No. 4-217242 and No. 4-275544. These publications disclose techniques for further improving in granularity by using silver halide particles in a tabular particle form, and techniques for improving gradation and color reproducibility, as well as granularity and sharpness, by modifying the layer structure of the photosensitive material and combining diffusible DIR compounds. However, there has been no technique that can overcome the problem of storage stability of a photosensitive material noted later, and particularly the problem of degradation of storage stability (desensitization over time) when using a high silver chloride emulsion having a relatively small particle size, which has been made clear by the invention.
SUMMARY OF THE INVENTION
The present invention has been developed to solve the problems associated with the conventional techniques and to attain the following objects.
An object of the invention is to provide a silver halide color photographic photosensitive material that has high image quality, is excellent in storage stability, and in finishing uniformity and processing stability when processed in laboratories, and exhibits less fluctuation in magenta density, and in particular, to provide a silver halide color photographic photosensitive material that can be suitably used as a cinematographic color positive photosensitive material.
As a result of earnest investigations made by the inventors with respect to these problems, it has been found that in order to realize high image quality, particularly improvement of the magenta granularity of high luminosity, and processing stability, particularly uniform photographic property when rapid processing, which are demanded by a silver halide color photographic photosensitive material, particularly a cinematographic color photographic photosensitive material, it is preferable that the halogen composition of all of the silver halide emulsion particles be controlled, and the average sphere-equivalent particle diameter of the green-sensitive emulsion particles be set at 0.25 &mgr;m or less.
However, when the foregoing photosensitive material is produced and evaluated, it has been confirmed that the finished magenta density suffers considerably large fluctuation while the material is sufficient in granularity and processing stability, particularly in uniform photographic property when rapid processing. This is a critical problem from the standpoint of always maintaining stable quality.
The inventors have then made further earnest investigations on the problem, and as a result, it has been found that the fluctuation in magenta density is a problem caused by the storage stability of the photosensitive material (desensitization of the magenta sensitivity of the photosensitive material over time), and the phenomenon specifically occurs in the case where the halogen composition is high silver chloride emulsion particles having a silver chloride content of 95% by mole or more, and the average sphere-equivalent particle diameter of the green-sensitive silver halide emulsion particles is set at 0.25 &mgr;m or less. In view of the findings, they have found that it is effective to dope the green-sensitive silver halide emulsion particles with iridium, and the amount of Fe in the photosensitive material is controlled. Moreover, they have found that restorability can be more improved to achieve this invention by using a flourine-based surface active agent to be contained in the photosensitive material, which has a specific structure. whereby the invention has been completed.
Therefore, the foregoing and other objects of the invention can be attained by the following embodiments.
A first embodiment of the invention is a silver halide color photographic photosensitive material comprising: a transmitting support; at least three types of photosensitive hydrophilic colloid layers disposed on the transmitting support, each type including at least one of a yellow color forming coupler, a magenta color forming coupler and a cyan color forming coupler; silver halide emulsion particles, which have a color sensitivity different from the other types, wherein at least one of the color sensitivities comprises green-sensitivity; and an Fe content of no more than 2×10
−5
moles/m
2
; each silver halide emulsion particle including a halogen composition, which comprises at least one of silver chlorobromide, silver chloroiodide, silver chloroiodide bromide and silver chloride having a silver chloride content ratio of 95% by mole or more, an average sphere-equivalent particle diameter of the green-sensitive silver halogen emulsion particles comprising no more than 0.25 &mgr;m and at least one type of the green-sensitive silver halogen emulsion particles being doped with Ir.
A second embodiment of the invention is the silver halide color photographic photosensitive material according to the first embodiment, further comprising at least one compound, in the silver halide color photographic photosensitive material, which is represented by the following general formula (FS):
wherein, A and B each independently represents
Sakai Hidekazu
Takada Kiyohito
Yanagi Terukazu
Fuji Photo Film. Co., Ltd.
Letscher Geraldine
Sughrue & Mion, PLLC
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