Silver salt photothermographic dry imaging material, an...

Details Silver salt photothermographic dry imaging material, an... Silver salt photothermographic dry imaging material, an...

2002-08-12

2004-02-10

Chea, Thorl (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Thermographic process

Heat applied after imaging

C430S523000, C430S600000, C430S603000, C430S607000, C430S619000, C430S621000, C430S622000, C430S631000, C430S945000

Reexamination Certificate

active

06689548

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a silver salt photothermographic dry imaging material, and an image recording method and an image forming method by the use thereof.
BACKGROUND OF THE INVENTION
Heretofore, in the medical and printing plate making fields, effluent resulting from wet type processing for image forming materials has become problematic in terms of workability. In recent years, from the viewpoint of environmental protection as well as space saving, a decrease in processing effluent has been highly demanded. Accordingly, there have been demanded techniques regarding photothermographic materials. These materials can be efficiently exposed utilizing laser imagers and image setters, and can form clear black-and-white images with a high resolution.
Examples of these techniques are described in U.S. Pat. Nos. 3,152,904 and 3,487,075, as well as in D. Morgan and B. Shely, “Thermally Processed Silver Systems”, (Image Processes and Materials, Neblette 8th edition, edited by Sturge, V. Walworth and A. Shepp, page 2, 1969). In these references have been disclosed silver salt photothermographic dry imaging materials that produce photographic images by employing a thermal development process.
These silver salt photothermographic dry imaging materials (hereafter it is also called “photothermographic imaging materials”) are characterized by a photosensitive layer that forms images by thermal development commonly at 80 to 140° C. In the photosensitive layer, an organic silver salt is used as a source of silver ions by utilizing an incorporated reducing agent and photosensitive silver halide grains as a photo-sensor. This image forming process does not comprise a fixing process. Much effort has been directed toward improvement of shapes of organic silver salt particles that can be easily and properly allocated in a photosensitive layer and have less adverse influence by light scattering. These shapes are expected to supply silver ions with smooth progress to silver halides, and at the same time to prevent the resulting image from decreasing transparency by light scattering in said photosensitive layer.
For the above-mentioned objects, however, an attempt to simply make particles smaller in size by dispersion or cracking with high mechanical energy using a disperser, causes problems of raised fog and lowered sensitivity. Further, this results in deteriorated image quality. These problems occur as a result of damaging said silver halide particles and organic silver salt particles. Accordingly, techniques to obtain high sensitivity and high image density without increasing an amount of silver, and also lowering fog density, are required.
A silane coupling agent is generally employed to enhance the strength of FRP (fiber glass reinforced plastics). In recent years, it has been widely employed due to its effect of adhesive properties of boundary surfaces of inorganic materials and organic resins, and thus, it is well known that said silane coupling agents are employed as hardeners for silver salt photothermographic dry imaging materials, as described in U.S. Pat. Nos. 4,886,739, 5,264,334 and 5,294,526.
The inventors of the present invention, however, have found that specific silyl compounds show distinguished effects of yielding high maximum density, high sensitivity and lowered fog when employed in photothermographic imaging materials.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a silver salt photothermographic dry imaging material that exhibits high maximum density and minimizes fog, and also to provide an image recording method and an image forming method, herein, both of which use said silver salt photothermographic dry imaging material.
The object of the invention can be achieved by the following embodiments.
1. A photothermographic imaging material comprising a support having thereon a photosensitive layer comprising a photosensitive silver halide, a light-insensitive organic silver salt, a binder and a reducing agent for silver ions,
wherein the photosensitive layer has a silver coverage of 0.8 to 2.5 g/m
2
, and the photosensitive layer comprises a compound represented by Formula (A) or Formula (B):
wherein each R
3
, R
4
and R
5
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, provided that R
5
includes a group represented by Formula (&agr;):
wherein Z represents OR
2
, X, or OH; n is an integer of 1 to 3; each R
1
and R
2
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group; and X is a chlorine atom or a bromine atom,
wherein Z
2
is OR
22
, X
2
, or OH; n
2
is an integer of 1 to 3; each R
21
and R
22
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, provided that R
21
contains at least one primary amino group or at least two selected from the group consisting of primary and secondary amino groups; and X is a chlorine atom or a bromine atom.
2. The photothermographic imaging material of item 1,
wherein the photosensitive layer has a silver coverage of 0.8 to 1.6 g/m
2
.
3. A photothermographic imaging material comprising a support having thereon a photosensitive layer comprising a photosensitive silver halide, a light-insensitive organic silver salt, a binder and a reducing agent for silver ions,
wherein the photosensitive silver halide has an average particle size of 0.01 to 0.15 &mgr;m, and the photosensitive layer comprises a compound represented by Formula (A) or Formula (B):
wherein each R
3
, R
4
and R
5
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, provided that R
5
includes a group represented by Formula (&agr;):
wherein Z is OR
2
, X, or OH; n is an integer of 1 to 3; each R
1
and R
2
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, and X is a chlorine atom or a bromine atom,
wherein Z
2
is OR
22
, X
2
, or OH; n
2
represents an integer of 1 to 3; each R
21
and R
22
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, provided that R
21
contains at least one primary amino group or at least two selected from the group consisting of primary and secondary amino groups; and X represents a chlorine atom or a bromine atom.
4. The photothermographic imaging material of item 3,
wherein the photosensitive silver halide has an average particle size of 0.03 to 0.10 &mgr;m.
5. A photothermographic imaging material comprising a support having thereon a photosensitive layer comprising a photosensitive silver halide, a light-insensitive organic silver salt, a reducing agent for silver ions and a binder,
wherein the photosensitive layer comprises a compound represented by Formula (A) or Formula (B) and the photosensitive layer further comprises a compound represented by Formula (1):
wherein each R
3
, R
4
and R
5
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, provided that R
5
includes a group represented by Formula (&agr;):
wherein Z represents OR
2
, X, or OH; n is an integer of 1 to 3; each R
1
and R
2
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group; and X is a chlorine atom or a bromine atom,
wherein Z
2
represents OR
22
, X
2
, or OH; n
2
is an integer of 1 to 3; each R
21
and R
22
is independently an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, provided that R
21
contains at least one primary amino group or at least two selected from the group consisting of primary and secondary amino groups; and X is a chlorine atom or a bromine atom
wherein Q represents an aryl group or an aromatic heterocyclic group; T represents a single bond or a bivalent aliphatic linking group; J represents a linking group containing at least one of O, S, and N; each Ra, Rb, Rc and Rd independently represents H,

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