Heat-developable color light-sensitive material

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

2000-11-22

2001-12-11

Schilling, Richard L. (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified backing or protective layer containing

C430S203000, C430S214000, C430S216000, C430S218000, C430S219000, C430S551000, C430S559000

Reexamination Certificate

active

06329129

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a heat-developable color light-sensitive material capable of giving a diffusion transfer image reduced in the uneven density of image and favored with excellent discrimination.
BACKGROUND OF THE INVENTION
A heat-developable color light-sensitive material is known in the art. The heat-developable light-sensitive material and process therefor are described, for example, in
Shashin Kogaku no Kiso
(
Principle of Photographic Engineering
),
Edition of Non
-
Silver Salt System Photography,
Corona Co., pp. 242-255 (1982), and U.S. Pat. No. 4,500,626.
Furthermore, a method of forming a dye image by the coupling reaction of an oxidation product of a developing agent with a coupler is described in U.S. Pat. Nos. 3,761,270 and 4,021,240. Also, a method of forming a positive color image by the bleaching of a photosensitive silver dye is described in U.S. Pat. No. 4,235,957.
A method of releasing or forming imagewise a diffusible dye by a heat development and then transferring the diffusible dye to a dye-fixing image-receiving material has already been put into practice. In this method, both a negative dye image and a positive dye image can be obtained by varying the kind of the dye-donating compound used or the kind of the silver halide used. More specifically, this method is described 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, EP-A-220746, JIII Journal of Technical Disclosure 87-6199 and EP-A-210660.
For obtaining a positive color image by a heat development, a large number of methods have been proposed. For example, U.S. Pat. No. 4,559,290 discloses a method of allowing a reducing agent or a precursor thereof to be present together with an oxidized DRR compound having no capability of releasing a dye image, oxidizing the reducing agent according to the amount of silver halide exposed by a heat development, and reducing the oxidized DDR compound with a reducing agent remaining unoxidized to release a non-diffusible dye. Furthermore, EP-A-220746 and JIII Journal of Technical Disclosure 87-6199 (Vol. 12, No. 22) disclose a heat-developable color light-sensitive material using a compound which releases a diffusible dye by the reductive cleavage of N—X bond (wherein X represents oxygen atom, nitrogen atom or sulfur atom) in the same mechanism as described above.
In these heat-developable light-sensitive materials, the matter of importance is how much the fogging can be suppressed at the heat development. Particularly, in the heat-developable light-sensitive material using a reductive dye-donating compound, the dye is released at the development, for example, by the oxidation reaction of the dissolved oxygen in the light-sensitive material and even when not exposed, the fogging disadvantageously increases.
In order to prevent this unnecessary oxygen oxidation, a method of adding a reducing agent to a light-sensitive material is described in JP-A-60-198540, JP-A-62-85241 and JP-A-62-201434. However, if such a compound is simply added to a layer containing light-sensitive silver halide, the silver halide is reduced to release a dye and the fog increases. Of course, even if the reducing agent is added to a layer adjacent to a light-sensitive layer, the fog is similarly some or less increased.
To solve this problem, a technique of adding a reducing agent to a layer in the outer side of a light-sensitive material farthest from the support and not adjacent to a light-sensitive layer is described in JP-A-5-127335 and JP-A-7-20620. This addition technique has a very high effect for preventing the increase of fogging, however, in the method described in JP-A-5-127335, it has been found that a certain particular smoke-like uneven density of image (unevenness like a black-and-white Japanese ink drawing very low in the density) is generated. Also, the technique described in JP-A-7-20620 where a countermeasure for the uneven density of image is taken account of has a problem that another uneven density of image is newly generated.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a color light-sensitive material capable of giving a diffusion transfer image free of uneven density of image and reduced in the fog.
The above-described object has been attained by the following inventions (1) to (3).
(1) A heat-developable color light-sensitive material having a multi-layer structure, comprising a support having thereon at least a light-sensitive silver halide emulsion, a hydrophilic binder and a dye-donating compound capable of releasing a diffusible dye in correspondence or counter-correspondence to the silver development, wherein at least two light-insensitive layers are provided between the support and a light-sensitive layer closest to the support and the light-insensitive layer not adjacent to the light-sensitive layer contains at least one compound represented by the following formula (I) or (II):
wherein R
1
to R
6
each represents hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, a sulfo group, a carboxyl group, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted carbamoyl group, a substituted or unsubstituted sulfamoyl group, a substituted or unsubstituted sulfonyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted arylcarbonyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group, a substituted or unsubstituted amino group or a substituted or unsubstituted acyloxy group, provided that at least one of R
1
and R
3
and at least one of R
4
and R
6
represent a hydroxyl group and that R
1
and R
2
, R
2
and R
3
, R
4
and R
5
, or R
5
and R
6
may be combined with each other to form a ring, X represents a divalent linking group, and n represents 1 or 0;
wherein R
7
and R
8
each represents hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted carbamoyl group, a substituted or unsubstituted sulfamoyl group, a substituted or unsubstituted acyl group, a substituted or unsubstituted arylcarbonyl group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group, a substituted or unsubstituted alkylthio group, a substituted or unsubstituted arylthio group, a substituted or unsubstituted alkoxycarbonyl group, a substituted or unsubstituted aryloxycarbonyl group, a substituted or unsubstituted amino group or a substituted or unsubstituted acyloxy group, provided that R
7
and R
8
may combine with each other to form a ring, Y represents —CO— or —SO
2
—, and R
9
represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted aryloxy group or a substituted or unsubstituted amino group.
(2) The heat-developable color light-sensitive material as described in (1) , which is scan-exposed at an exposure time of 1×10
−5
seconds or lower per one picture element.
(3) The heat-developable color light-sensitive material as described in (1) or (2), wherein at least one light-sensitive layer has a sensitivity maximum wavelength in the infrared wavelength region of 750 nm or more.
DETAILED DESCRIPTION OF THE INVENTION
The specific construction of the present invention is described in detail below.
The compound represented by formula (I) or (II) for use in the present invention is a so-called hydroquinone derivative

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