Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
2001-10-25
2003-03-04
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S567000, C430S550000, C430S600000, C430S601000, C430S603000, C430S351000, C430S206000, C430S376000, C430S471000
Reexamination Certificate
active
06528243
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel silver halide color photographic light-sensitive material, which is utilized to record an image.
BACKGROUND OF THE INVENTION
Photographic light-sensitive materials utilizing a silver halide have been increasingly developed in recent years, bringing about the present situation in which a high-quality color image is readily available. For example, in a system generally called color photography, a color negative film is utilized to take a photograph, and image information that is recorded on the color negative film after processing, is optically printed on a color photographic printing paper, to obtain a color print. This process has been highly developed in recent years, driving the spread of color laboratories, which are large-scaled central bases producing a large number of color prints with high efficiency, and so-called minilabs, which are small-sized and simple printer processors set up in shops; and it becomes possible to allow anyone to enjoy color photography conveniently.
The principle of color photography, which is currently spreading, is based on color reproduction according to a subtractive color process. In usual color negative, light-sensitive layers, utilizing silver halide emulsions, which are light-sensitive elements provided with light sensitivity in blue, green, and red regions, are provided on a transparent support, and so-called color couplers that respectively form a yellow, a magenta, and a cyan dye, which has a complementary hue in each light-sensitive layers, are contained in these light-sensitive layers in combination, respectively.
The color negative film, exposed image-wise by photographing, is processed in a color-developing solution containing an aromatic primary amine developing agent. At this time, the sensitized silver halide grain is developed, i.e. reduced, by the developing agent, and each dye is formed by a coupling reaction between an oxidized product of the developing agent, which is formed concurrently with the foregoing reduction, and the above-mentioned respective color coupler. Metal silver (developed silver) produced by the development, and unreacted silver halide, are removed through bleaching and fixing processes respectively, to obtain a dye image.
A color photographic printing paper, which is a color light-sensitive material, obtained by applying, on a reflective support, light-sensitive layers having a combination of a light-sensitive wavelength regions and hues to be produced in each layer similar to that of the color negative film, is optically exposed through the processed color negative film. Then, the resultant paper is subjected to the color-developing, bleaching, and fixing processes similar to the case of the negative film, to obtain a color print composed of a dye image, with which the original scene is reproduced.
These systems are widespread at present, but there is an increasingly strong need to improve the simplicity of these systems. First, for processing baths used for carrying out the aforementioned color-developing, bleaching, and fixing processes, the compositions and temperatures of these baths must be exactly controlled, requiring special knowledge and skilled operation. Second, these processing solutions contain substances, such as a color-developing agent and a bleaching agent of an iron chelating compound, whose discharge must be regulated from the environmental viewpoint. Therefore special equipment is often required for the installation of processing instruments. Third, it takes time for these development processings, though the processing time required for these processings is reduced by recent development in the technologies concerned. It can be said that the level of time reduction is still insufficient to satisfy the present need for reproducing a recorded image rapidly.
In view of these standpoints, many proposals concerning improved techniques have been offered. A variety of techniques utilizing heat development have been proposed with the intention of, particularly, simplifying and accelerating a development processing.
There are descriptions concerning heat-developable light-sensitive materials and processes used for these materials in, for example, “Shasin Kogaku no Kiso”, Higinen Shashin-hen, (published by Corona-sha, 1982), pp. 242 to 255.
Many methods have been proposed concerning methods to obtain a color image by heat development. For example, methods of forming a color image by a binding reaction of an oxidized product of a developing agent and a coupler are proposed in U.S. Pat. No. 3,531,286, U.S. Pat. No. 3,761,270, and U.S. Pat. No. 4,021,240; Belgian Patent No. 802519, Research Disclosure (hereinafter abbreviated to as RD), September (1975), pp.31-32, and the like.
However, in these methods, a relatively long time is generally required for processing, and the resulted image is highly foggy and has low image density, which are still insufficient.
As a system that does not require a processing solution containing a color-developing agent, a PICTROGRAPHY (trade name) system, and a PICTROSTAT (trade name) system, are provided by Fuji Photo Film Co., Ltd. In this system, a small amount of water is supplied to a light-sensitive material containing a base precursor, and the light-sensitive material is superimposed to an image-receiving material, followed by heating, to cause a development reaction. This system is environmentally advantageous in the point that the aforementioned processing bath (solution) is not used. However, this system is used for the purpose of fixing the formed dye to a dye-fixing layer, and appreciating it as a dye image.
All of the aforementioned systems are used for the purpose of appreciation use, and the development of a system that can be used for a recording material for photographing is desired.
Because it is demanded that silver halide light-sensitive materials for photographing have high sensitivity, it is essential to increase the sensitivity of a silver halide grain, and a tabular grain is therefore used by preference.
Various silver halide grains preferably used in heat development systems, in which processing is carried out at a high temperature, have been proposed. For example, JP-B-2-48101 (“JP-B” means examined Japanese patent publication) discloses a technique for improving the thermal-developing progress characteristics, by using a tabular silver halide having a grain diameter five times the grain thickness or more, in a thermal-developing light-sensitive material.
Also, JP-A-62-78555 (“JP-A” means unexamined published Japanese patent application) discloses a technique for improving the long-term storage stability of a thermal-developing light-sensitive material, by allowing the light-sensitive material to contain a tabular light-sensitive silver halide grain, in which the content of silver iodide is 4 to 40 mol %, and the ratio of the grain diameter to the grain thickness is 5 or more, in an amount of 0.05 to 1 mol, per mol of an organosilver salt.
Moreover, JP-A-62-79447 discloses a technique for improving the sensitivity and the maximum density in processing, by allowing a light-sensitive material to contain a tabular light-sensitive silver halide grain in which the ratio of the grain diameter to the grain thickness is 5 or more, and a light-sensitive silver halide grain in which the content of a silver iodide is 4 to 40 mol % and the average grain diameter is 0.4 &mgr;m or less.
An attempt has been made to make a structure of a light-sensitive material for photographing that can be processed simply and rapidly, by applying each of these emulsions utilizing tabular grains to the aforementioned thermal-developing system. However, it was found that the use of the tabular grain brings about insufficient sensitivity and maximum density, creating a hindrance to practical use.
A technique regarding tabular silver halide grains having a thin grain thickness and an average diameter of a circle whose area is equivalent to a projected area of an individual grain (hereinafter which is also referred
Kawagishi Toshio
Koide Tomoyuki
Fuji Photo Film Co. , Ltd.
Letscher Geraldine
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