Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2001-06-08
2004-02-03
Le, Hoa Van (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S569000
Reexamination Certificate
active
06686141
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2000-172800, filed Jun. 8, 2000, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a novel silver halide photographic light-sensitive material for image recording (hereinafter may simply be referred to as “light-sensitive material”) and a method of forming an image therein. More particularly, the present invention relates to a silver halide photographic light-sensitive material which is highly sensitive and is excellent in rapid processability and a method of forming an image therein.
Now, high-quality recorded images can easily be obtained by the use of a photographic light-sensitive material based on a silver halide. For example, generally, in the system known as “color photography”, photography is first performed with the use of a color negative film. Then, the color negative film is developed, and the image information recorded in the developed color negative film is optically printed on color photographic paper. Thus, a color print is obtained. In recent years, this process has been highly progressed, and now everyone can readily enjoy color photographs by virtue of the spread of color laboratories which are large-scale centers where a large number of color prints can be produced with high efficiency, or so-called “minilabos” which are small simple printer processors installed at shops.
Although the above system is now widely spread, the demand for greater simplicity thereof is increasing. For example, first, with respect to the processing baths for carrying out development, bleaching and fixing, it is needed to accurately control the composition and the temperature thereof, so that expert knowledge and skilled operation are required. Secondly, the processing solutions contain developing agents, chelate compounds as bleaching agents and other substances whose effluence must be regulated from the viewpoint of the environment, so that special equipment may be needed at the installation of the developing apparatus. Thirdly, development requires much time, although it has been shortened as a result of technical development in recent years, so that meeting the demands for rapid reproduction of recorded images is still unsatisfactory. As is apparent from the above, there still remains room for improvement in the system.
Also, requirements on the light-sensitive material are becoming stricter. Higher demands are being imposed on photographic performance such as sensitivity increase, image quality such as graininess or sharpness, and toughness such as storage stability or pressure resistance.
Rapidly processable light-sensitive materials containing tabular silver halide grains are disclosed in, for example, Jpn. Pat. Appln. KOKAI Publication Nos. (hereinafter referred to as JP-A's) 10-115888, 10-62936, 9-61960 and 62-78555. The technologies disclosed in these publications, although enabling production of highly sensitive and rapidly processable light-sensitive materials, are still unsatisfactory in respect of toughness, such as storage stability or pressure resistance, of light-sensitive material. Further, the technologies for finely controlling the film pAg of light-sensitive material are disclosed in, for example, JP-A's 8-146570 and 4-324856. The light-sensitive materials disclosed in these publications, although being excellent in rapid processability, are light-sensitive materials wherein an emulsion constituted of regular grains is used as silver halide grains, so that these are conspicuously inferior, in respect of sensitivity and image quality from the viewpoint of practical application, to the light-sensitive material for photography wherein use is made of an emulsion constituted of tabular silver halide grains according to the present invention.
BRIEF SUMMARY OF THE INVENTION
It is an object of the present invention to provide a silver halide color photographic light-sensitive material, which is highly sensitive, ensures high image quality and is excellent in storage stability despite easy rapid processing. It is another object of the present invention to provide a method of forming an image, which can stand practical use.
These objects of the present invention have been attained by the following means. That is, the means include:
(I) A silver halide photographic light-sensitive material comprising, on a support, at least one light-sensitive silver halide emulsion layer and at least one non-light-sensitive layer, wherein 60% or more of the total projected area of silver halide grains contained in the at least one light-sensitive silver halide emulsion layer are tabular silver halide grains having an average aspect ratio of 5 or more, and a film pAg on the light-sensitive silver halide emulsion layer side of the material falls within 4.0 to 8.5.
(II) The material according to item (I), wherein the tabular silver halide grains have an average thickness of 0.01 to 0.12 &mgr;m.
(III) The material according to item (I), wherein at least some of the tabular silver halide grains have a sensitizing dye adsorbed thereon so as to exhibit a spectral absorption maximum wavelength of less than 500 nm and a light absorption intensity of 60 or more, or so as to exhibit a spectral absorption maximum wavelength of 500 nm or more and a light absorption intensity of 100 or more.
(IV) The material according to item (I), wherein a developing agent and/or a precursor thereof is contained in the at least one light-sensitive silver halide emulsion layer and/or the at least one non-light-sensitive layer.
(V) The material according to item (IV), wherein the developing agent is at least one compound selected from among the compounds represented by the following general formulae (1) to (5):
where each of R
1
to R
4
independently represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkylcarbonamido group, an arylcarbonamido group, an alkylsulfonamido group, an arylsulfonamido group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an alkylcarbamoyl group, an arylcarbamoyl group, a carbamoyl group, an alkylsulfamoyl group, an arylsulfamoyl group, a sulfamoyl group, a cyano group, an alkylsulfonyl group, an arylsulfonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkylcarbonyl group, an arylcarbonyl group or an acyloxy group; R
5
represents a substituted or unsubstituted alkyl group, aryl group or heterocyclic group; Z represents an atom group (including a carbon atom of the formula) capable of forming an aromatic ring (including a heteroaromatic ring), which may have substituents other than —NHNHSO
2
-R
5
or —NHNHCONH-R
5
, provided that when Z is a benzene ring, the total of Hammett's constants (&sgr;) of the substituents is 1 or more; R
6
represents a substituted or unsubstituted alkyl group; X represents an oxygen atom, a sulfur atom, a selenium atom or a tertiary nitrogen atom substituted with an alkyl or aryl; and each of R
7
and R
8
independently represents a hydrogen atom or a substituent, wherein R
7
and R
8
may be bonded to each other to thereby form a double bond or a ring.
(VI) The material according to item (IV), wherein the developing agent is a p-phenylenediamine compound and/or a p-aminophenol compound.
(VII) The material according to item (IV), wherein the developing agent precursor is a compound represented by the following general formula (6):
where each of R
1
, R
2
, R
3
and R
4
independently represents a hydrogen atom or a substituent; each of R
5
and R
6
independently represents an alkyl group, an aryl group, a heterocyclic group, an acyl group or a sulfonyl group; R
1
and R
2
, R
3
and R
4
, R
5
and R
6
, R
2
and R
5
, and/or R
4
and R
6
may be bonded to each other to thereby form a 5-membered, 6-membered or 7-membered ring; and R
7
represents R
11
-O—CO—, R
12
-CO—CO—, R
13
-NH—CO—, R
14
-SO
2
—, R
15
-W—C (R
16
)(R
17
)- or (M)
1
OSO
2
—, wher
Fuji Photo Film Co. , Ltd.
Le Hoa Van
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