Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified radiation sensitive composition with color...
Reexamination Certificate
2000-01-28
2001-09-18
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified radiation sensitive composition with color...
C430S503000, C430S377000
Reexamination Certificate
active
06291151
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide photographic light-sensitive material having excellent rapid processing suitability, and to a method of forming an image using the same. More specifically, the present invention relates to a silver halide color photographic light-sensitive material that comprises grains comprising a tabular silver chloride, or silver chlorobromide, silver chloroiodide, or silver chloroiodobromide, each of which has a high silver chloride content, thereby enabling reduction of each of image-forming time at color development, bleach-fixing time, and washing time, and to a method of forming an image using the light-sensitive material.
Further, the present invention relates to a silver halide photographic light-sensitive material that can reduce each of image-forming time at color development, bleach-fixing time, and washing time, without any harmful influence; a silver halide photographic light-sensitive material having excellent image fastness (stability), and a method of forming an image using the same.
BACKGROUND OF THE INVENTION
Recently, in the field of photographic processing service, a high-image-quality light-sensitive material that can be rapidly processed, is desired as a part of improving service to users in order to reduce, for example, customer's waiting time, and also as means of increasing production efficiency. For this purpose, several technologies have been proposed using silver halide grains having a high silver chloride content, so-called “high silver chloride grains,” which means silver halide grains having a silver chloride content of 80% or more (hereinafter referred to as high silver chloride grains). The use of high silver chloride grains gives such advantages as that developing speed is accelerated, and the reusability or recycling property of a processing solution is increased. Presently, a light-sensitive material of the type using high silver chloride grains is dominant in the light-sensitive materials for print, such as color photographic printing paper. A processing system in which a light-sensitive material containing a high silver chloride emulsion is processed at a color-developing time of 45 seconds, and a total processing time of less than 4 minutes, is generally used (for example, the color processing system CP-45X, tradename, manufactured by FUJI PHOTO FILM CO., LTD.). However, it is difficult to say that the level of total processing time required for such a system is wholly satisfactory, compared with other color systems (for example, an electrostatic transfer system, a thermal transfer system, and an inkjet system). There is a demand for ultra-rapid processing at a level in which the total processing time is less than 1 minute.
In order to achieve the above-described ultra-rapid processing, various kinds of investigations have been carried out with respect to two aspects: the processing solution and the light-sensitive material.
In order to achieve ultra-rapid processing, it is necessary to shorten each of steps of {circle around (1)} color development, {circle around (2)} bleach-fixing, and {circle around (3)} washing/stabilization. With respect to color development, some attempts have been made, such as use of high temperature, high pH, and high-concentration color-developing agent. Further, addition of additives, such as a development accelerator, is also known. Examples of the development accelerator include 1-phenyl-3-pyrazolidone, described in British Patent No. 811,185; N-methyl-p-aminophenol, described in U.S. Pat. No. 2,417,514; and N,N,N′,N′-tetramethyl-p-phenylenediamine, described in JP-A-50-15554 (“JP-A” means an unexamined published Japanese patent application). However, satisfactory rapidity cannot be achieved by these methods. Rather, deterioration of properties, such as increased fogging, often occurs.
Further, some attempts have been made to reduce bleach-fixing time, that is, making desalting to be rapid, by use of such as high-temperature, low pH, and high-concentration bleach ingredients. However, some problems occur, such as that the stability of a bleaching solution deteriorates, that cyan dye density is lowered by reduction of the cyan dye to a leuco base (Blix discoloration), and that insufficiency of washing bleach ingredients (primarily an iron salt of ethylenediamine tetracetic acid, and the like) occurs.
Further, at the step of washing, usually the final bath is replenished, and countercurrent-type multistage washing is used. Further, it is practically carried out to improve efficiency of washing by reducing the salt density in water using an ion-exchanged water, and/or by increasing the temperature of washing water. However, even though rapidity has been achieved to some extent, there are still many insufficiencies, in that an irradiation neutralizing dye, a sensitizing dye, a developing agent, ingredients of a Blix processing solution, and the like are sometimes incompletely washed out due to a shortage of processing time.
On the other hand, from the viewpoint of a light-sensitive material having ultra-rapid processing suitability, investigations have been made with respect to the use of a high-activity coupler and a coupler having a high extinction coefficient, reducing the amount of gelatin, and the like. However, the present existing light-sensitive materials fail to satisfy various properties required for a light-sensitive material.
Further, JP-A-7-239538 and JP-A-7-239539 describe that a silver halide emulsion layer containing a yellow coupler is coated on the same side but further from (apart from) a support than at least any one layer of a silver halide emulsion layer containing a magenta coupler and a silver halide emulsion layer containing a cyan coupler, each being coated on the support, to thereby achieve advance in color development speed. However, according to the method described in these publications, there are such disadvantages that fog stripes of an emulsion at the yellow-coloring layer are induced by pressure when processed using a roller conveyance type autoprocessor, processing color contamination becomes worse, or a cyan-colored density is lowered by Blix discoloration. Accordingly, further advanced technologies have been required. Further, there is also such a problem that at the time of processing by means of a roller conveyance type autoprocessor, if a curl of the light-sensitive material is large, formation of the fog stripes becomes larger.
Meantime, the high silver chloride grains having an excellent rapid processing suitability tend to form grains whose exterior faces (planes) are {100} faces (hereinafter referred to as {100} grains) under usual production conditions. In fact, the practically used grains are cubic. Recently, tabular {100} grains having a large specific surface area (the ratio of a surface area to a volume), thereby enabling an effective spectral sensitization, have been developed. Examples of these tabular grains are disclosed in, for example, U.S. Pat. Nos. 5,320,938, 5,264,337 and 5,292,632.
However, the high silver chloride {100} grains have a problem that they are easily fogged, when compared to commonly used silver bromide grains. In order to overcome this problem, the use of high silver chloride grains whose exterior faces are {111} faces (hereinafter referred to as {111} grains) has been proposed, as disclosed in JP-A-6-138619.
Special means are necessary to produce the high silver chloride {111} grains. In U.S. Pat. No. 4,399,215, Way discloses a method of producing high silver chloride tabular grains, which comprises using ammonia. However, it was difficult to produce practically useful small size grains by this method which comprises using ammonia, thereby producing silver chloride grains having high solubility under the conditions of higher solubility. Further, this method has a disadvantage that fogging easily occurs because the pH at the time of the production is as high as 8 to 10. In U.S. Pat. No. 5,061,617,
Deguchi Yasuaki
Ohzeki Katsuhisa
Takada Katsuyuki
Yoneyama Hiroyuki
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Le Hoa Van
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