Silver halide color photosensitive material

Details Silver halide color photosensitive material Silver halide color photosensitive material

2002-12-27

2004-08-03

Letscher, Geraldine (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

C430S543000, C430S551000

Reexamination Certificate

active

06770431

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2001-401228, filed December 28, 2001, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a novel color coupler compound, and relates to a silver halide color photosensitive material containing the novel color coupler compound and an image-forming method using the silver halide color photosensitive material. More particularly, the present invention relates to a silver halide color reversal photosensitive material and an image-forming method using the same.
2. Description of the Related Art
In recent years, the demands on silver halide color photosensitive materials for not only photographic speed increase, excellent sharpness and graininess but also faithful color reproduction to originals are strong.
In recent years, pyrazolotriazole couplers of low secondary absorption are in practical use as a magenta dye forming coupler. It has become apparent that pyrazolotriazole magenta couplers, although being compounds having excellent characteristics in hue, pose various problems such as low color-forming property, low resistance to processing variation and poor color image storability.
For example, couplers wherein the position for coupling with an oxidized aromatic primary amine developer is a hydrogen atom, known as 4-equivalent couplers, have drawbacks such as low color-forming property and yellow coloring upon aging after development processing, although the couplers are excellent in graininess. On the other hand, couplers having a coupling position substituted with a split-off group other than a hydrogen atom (for example, a halogen atom), known as 2-equivalent couplers, have a drawback in that the graininess is lowered to thereby result in deterioration of image quality, although the couplers are characterized in that, as compared with those of the 4-equivalent couplers, a color formation occurs with a decreased amount of silver and the possibility of yellow coloring is lowered.
Further, most of these couplers are used in the form of a solution or dispersion in a high-boiling organic solvent such as a phosphoric ester or a phthalic ester. In recent years, in accordance with the requirement for high sharpness, the amount of high-boiling organic solvent added tends to be reduced, and so-called oilless is demanded. However, with respect to most of pyrazolotriazole magenta couplers, extreme lowering of color-forming property is caused when they are used in an oilless state. Therefore, an improvement thereto is being demanded.
For solving the above problems, there have been proposed couplers based on pyrazolotriazoles wherein various ingenuities have been exerted onto substituents on the pyrazolotriazole ring. For example, with respect to the durability of color image, an improvement by a coupler having a 6-position substituent rendered bulky has been disclosed in U.S. Pat. No. 4,882,266 and E.P. 183,445.
Further, with respect to an improvement to color-forming property in an oilless state, a coupler having a carboxyl group introduced as a split-off group in the molecule thereof has been disclosed in Jpn. Pat. Appln. KOKAI Publication No. (hereinafter referred to as JP-A-) 1-102557.
However, these disclosed technologies have been unsatisfactory for the resolution of problems, such as yellow coloring by aging after processing and color image storability. Introduction of a split-off group, although an improvement in color-forming property can be recognized, causes couplers to suffer a cost increase and a poor crystallinity, thereby posing a problem in the industrial application. Moreover, additional problems, such as yellow staining of undyed portions by light irradiation or in humid heating atmosphere and occurrence of photographic speed drop during the stay from mixing with a color-sensitized silver halide emulsion through coating, have revealed. Still further, the resistance to variations of processing solution compositions is unsatisfactory, so that an improvement thereto has been demanded.
Most of the pyrazoloazole couplers now in practical use are 2-equivalent couplers. In the processing of color reversal photosensitive material, the first development is followed by reversal, and thereafter a color development processing is carried out. At this stage, the 2-equivalent couplers pose such an inherent problem that the color-forming property per mol of silver is high, thereby causing the photographic speed to be low as compared with those of the 4-equivalent couplers. Accordingly, when it is intended to apply a pyrazolotriazole magenta coupler to a color reversal photosensitive material, 4-equivalent couplers are preferably employed from the viewpoint of photographic speed. The application of 4-equivalent pyrazolotriazole magenta couplers to color reversal photosensitive materials is disclosed in, for example, JP-A's 1-102557, 5-100382 (pages 13-15, 24-34, 42-45 and 53-63), 2001-33921 (pages 12-44) and 2001-324784 (pages 22-41). However, these disclosed technologies are not yet satisfactory for resolving the problems of durability to variations in processing solution compositions, and a solution to the problem of yellow coloring by aging after processing is desired.
BRIEF SUMMARY OF THE INVENTION
It is the first object of the present invention to provide a magenta coupler capable of accomplishing stable image formation despite variations of processing solution compositions and further to provide a magenta coupler which realizes excellent color-forming property even in the reduction of high-boiling organic solvents, in so-called an oilless state. It is the second object of the present invention to provide a silver halide color photosensitive material which enables stable image formation despite variations of processing solution compositions, which exhibits excellent color reproducibility and durability, and which arises less stain.
The inventors have made extensive and intensive studies with a view toward obtaining a coupler which exhibits satisfactory color-forming property even in an oilless state, and also which arises less stain, which enables stable image formation despite variations of processing solution compositions, and which is excellent in graininess, image storability, etc. As a result, the present invention has been completed.
The objects of the present invention have been attained by the following means.
(1) A silver halide color photosensitive material comprising a 1H-pyrazolo[3,2-c]-1,2,4-triazole type coupler having, in its molecule, at least one substituent represented by the following general formula (I):
wherein R
1
represents a substituent, m represents an integer of 0 to 4, and R
2
represents an alkyl group, alkenyl group or aryl group.
(2) The silver halide color photosensitive material according to item (1) above wherein the coupler described in item (1) above is represented by the following general formula (II):
wherein R
3
represents a substituent; X
1
represents a hydrogen atom or a group capable of splitting-off upon reaction with an oxidized developing agent; R
4
and R
5
each independently represents a hydrogen atom, alkyl group, or aryl group; and n represents an integer of 1 to 3. M represents —O—, —S—, —SO—, —SO
2
—, —C(═O)O—, —OC(═O)—, —C(═O)N(R
6
)—, —N(R
6
)C(═O)—, —SO
2
N(R
6
)—, —N(R
6
)SO
2
—, —C(R
6
)C(═O)N(R
7
)—, —N(R
6
)C(═O)O— or —OC(═O)N(R
6
)—, wherein R
6
and R
7
each independently represents a hydrogen atom, alkyl group or aryl group; L
1
represents an alkylene group, aralkylene group or arylene group; and p represents 0 or 1. * represents the position at which the group represented by the general formula (I) is attached.
(3). A silver halide color photosensitive material comprising at least one coupler represented by the following general formula (III) or general formula (IV):
wherein R
8
represents a substituent; X
2
rep

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