Heat developable color photographic light-sensitive material

Details Heat developable color photographic light-sensitive material Heat developable color photographic light-sensitive material

1999-02-22

2001-07-24

Le, Hoa Van (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

C430S467000, C430S470000, C430S543000

Reexamination Certificate

active

06265142

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a heat developable color photographic light-sensitive material, more particularly to a heat developable color photographic light-sensitive material which provides excellent images upon development for a very short time and which is excellent in preservation stability before imagewise exposure.
BACKGROUND OF THE INVENTION
The heat developable color light-sensitive materials are known in the field of art. For instance, methods for forming dye images by a coupling reaction of an oxidation product of a developing agent with a coupler are described, for example, in U.S. Pat. Nos. 3,761,270 and 4,021,240. Also, methods for forming positive color images by a light-sensitive silver dye bleach process are described, for example, in U.S. Pat. No. 4,235,957.
Further, a method has recently been proposed in which a diffusible dye is released or formed imagewise by heat development and the diffusible dye is transferred onto a dye fixing element. According to the method, either a negative dye image or a positive dye image can be obtained by changing the kind of dye providing compound used or the kind of silver halide used. More details thereof are described, for example, in U.S. Pat. Nos. 4,500,626, 4,483,914, 4,503,137 and 4,559,290, JP-A-58-149046 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”), JP-A-60-133449, JP-A-59-218443, JP-A-61-238056 and EP-A-210,660.
Many methods for obtaining positive color images upon heat development have been proposed. For instance, in U.S. Pat. No. 4,559,290, a method is described wherein an oxidized compound, which in its oxidized state does not have a dye releasing ability, obtained by converting a so-called DRR compound, is coexistent with a reducing agent (including a precursor thereof), the reducing agent is oxidized in correspondence to an exposure amount of silver halide upon heat development, and the oxidized compound is reduced with the remaining reducing agent which has been not oxidized, whereby a diffusible dye is released. Further, in U.S. Pat. No. 4,783,396 and
Kokai Giho
87-6199 (Vol. 12, No. 22), a heat developable color light-sensitive material containing, as a compound capable of releasing a diffusible dye in a similar mechanism, a compound which can release a diffusible dye upon reductive cleavage of an N—X bond (wherein X represents an oxygen atom, a nitrogen atom or a sulfur atom) is described.
On the other hand, progress on computer graphics is remarkable in recent years as described, for example, in
Eizojoho,
edited by Kunigome Takeshi, October, 1993 published by Sangyo Kaihatsu Kiko Co., Ltd., and in order to output such image information, various systems of color printers (color hard copiers) of high image quality have been developed. For instance, printers for heat developable color light-sensitive materials using silver halide such as Pictrography 3000 and Pictrostat Digital 400 manufactured by Fuji Photo Film Co., Ltd. are commercially available.
Since negative-positive conversion is digitally conducted in these devices, conventional DRR compounds can be employed as they are in light-sensitive materials and images excellent in discrimination are available.
Although images having excellent image quality can be obtained in a short period of time using such light-sensitive materials, more rapid processing has been desired in a market place, recently. Processing at higher temperature is attempted in order to reduce the processing time. However, control of a period of time for processing is difficult under such a condition and unevenness of image occurs in some cases.
On the other hand, a technique for accelerating development by adding a reducing agent such as phenidone as an electron transfer agent is known for a long time. However, when such known reducing agents are used, problems, for example, degradation of stability of light-sensitive material, increase in density of white background area and decrease in color separation tend to occur.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a silver halide color photographic light-sensitive material which provides images excellent in discrimination upon development processing for a very short time and which is excellent in preservation stability.
Other objects of the present invention will become apparent from the following detailed description and examples.
It has been found that these objects of the present invention are accomplished with a heat developable color photographic light-sensitive material comprising at least one dye providing compound represented by the formula (L1) shown below and at least one developing agent represented by the formula (1) or (2) shown below:
(Dye-X)
q
—Y  (L1)
wherein Dye represents a dye moiety, a dye moiety temporarily shifted to a short wavelength or a dye precursor; X represents a mere bond or connecting group; Y represents a group having a property of bringing about the difference in diffusibility of the compound represented by (Dye-X)
q
—Y corresponding to or reversely corresponding to a light-sensitive silver salt having imagewise a latent image, or releasing Dye to generate the difference in diffusibility between Dye released and the compound represented by (Dye-X)
q
—Y; and q represents 1 or 2, and when q is 2, two Dye-X groups may be the same or different;
wherein R
1
, R
2
, R
3
and R
4
, which may be the same or different, each represents a hydrogen atom, a halogen atom, a cyano group or an alkyl, aryl, heterocyclic, alkoxy, aryloxy, alkylthio, arylthio, alkylcarbonyl, arylcarbonyl, alkylsulfonyl, arylsulfonyl, alkylcarbonamido, arylcarbonamido, alkylsulfonamido, arylsulfonamido, alkylcarbonyloxy, arylcarbonyloxy, carbamoyl, alkylcarbamoyl, arylcarbamoyl, alkoxycarbonyl, aryloxycarbonyl, sulfamoyl, alkylsulfamoyl, arylsulfamoyl, ureido or urethane group having not more than 4 carbon atoms or an I/O value of not less than 1; and R
5
represents an alkyl group, an aryl group, a heterocyclic group, an alkylamino group, an arylamino group or a heterocyclic amino group.
DETAILED DESCRIPTION OF THE INVENTION
The dye providing compound represented by the formula (L1) will be described in more detail below.
Dye represents a dye moiety having one or more dyes or dye precursors, and q represents 1 or 2 and when q is 2, two Dye-X groups may be the same or different. Preferably, q is 1.
X represents a mere bond or a linking group which is dissociated corresponding to or reversely corresponding to development. Representative examples of the linking group represented by X include a group represented by —N(J
1
)—(wherein J
1
represents a hydrogen atom, an alkyl group or a substituted alkyl group), —SO
2
—, —CO—, an alkylene group, a substituted alkylene group, a phenylene group, a substituted phenylene group, a naphthylene group, a substituted naphthylene group, —O—, —SO—and a group obtained by combining two or more of these divalent groups. Among these, a group represented by —N(J
1
)—SO
2
—, a group represented by —N(J
1
)—CO— and a group represented by —J
2
—(L)
k
—(J
3
)
r
—, wherein J
2
and J
3
each represents an alkylene group, a substituted alkylene group, a phenylene group, a substituted phenylene group, a naphthylene group or a substituted naphthylene group; L represents —O—, —SO—, —SO
2
—, —CO—, —SO
2
NH—, —CONH— or —NHCO—; k represents 0 or 1; and r represents 1 or 0 are preferred. A combination of —N(J
1
)—SO
2
— or —N(J
1
)—CO— with —J
2
—(L)
k
—(J
3
)
r
— is also preferred.
In the formula (L1), it is particularly preferred that Dye and Y are connected in the form of Dye-SO
2
NH—Y.
Now, Y in the formula (L1) is described below.
Y represents a group having a property of dissociating the Y—X bond corresponding to or reversely corresponding to a light-sensitive silver halide having a latent image. Such a group is known in the field of photographic chemistry utilizing diffusion transfer of a dye and examples thereof are described in U.S. Pat. No. 5,021,334 (corresponding to JP-A-2-184852).
Y i

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