Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Antihalation or filter layer containing
Reexamination Certificate
2001-09-27
2002-09-03
Chea, Thorl (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Antihalation or filter layer containing
C430S510000, C430S512000, C430S522000, C430S523000, C430S619000
Reexamination Certificate
active
06444415
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to thermally developable light-sensitive material comprising a specific dye, a silver halide light-sensitive material comprising said specific dye, an image forming method using the same, a filter comprising said specific dye, and a support comprising said specific dye usable for a silver halide photosensitive material.
BACKGROUND OF THE INVENTION
In exposing a light-sensitive material to light, incident light is reflected or refracted by a silver halide, other additives, or at a layer interface, and as a result, the image dims and resolution degrades. In order to prevent such resolution degradation, an anti-halation (AH) dye or an anti-irradiation (AI) dye have been widely employed.
Conventionally, necessary characteristics of these AH and AI dyes are the following: they absorb a desired wavelength of light; they do not give an adverse effect to a silver halide emulsion; and they completely decolor or leach out of a photosensitive material so as not to leave any residual color stain in said photosensitive material.
In recent years, the trend toward more and more rapid developing processes and a dry developing process have been marked, and color stain derived from these dyes after processing a light-sensitive material, namely, residual color stain, has received much study. Therefore, reducing said residual color stain has been strongly demanded. Specifically, in the case of a dry process, using no water, in which dyes can not leach out of said photosensitive material, said residual color stain tends to become critical, therefore, reducing said residual color stain has become a point of focus.
Representative AI and AH dyes which can absorb infrared rays are organic dyes, and many such organic dyes have been suggested. Among them, specifically used have been cyanine and oxonol dyes. However, absorption in the visible region of these dyes is relatively large, and these dyes are also marginal effectiveness in preventing said residual color stain, since decomposed compounds derived from these dyes absorb yellow light. Further, these compounds are relatively unstable and decomposable, and still further, synthesizing these compounds is relatively expensive.
The solubility of squarylium dye and croconium dye in an organic solvent is, in general, relatively low, therefore, additon of these dyes into a silver halide photographic light-sensitive material is very challenging. Further, since spectral absorption characteristics of these dyes, in the form of a dispersion, tend to vary, reducing the sectral absorption characteristics has been demanded.
A thermally developable photographic light-sensitive material comprising a squarylium dye having a naphthalene ring is disclosed in Japanese Patent Publication to Public Inspection under PCT Application No. 9-509503, as well as in Japanese Patent Publication Open to Public Inspection (hereinafter referred to as JP-A) Nos. 8-262986, 10-236695, 10-104779, 10-158253 and 10-204310, however, these dyes are tinged with yellow, and therefore, their residual color stain is unacceptable. Furthermore, heat stability of these dyes is also unacceptable, so that storage stability of these dyes, used in a light-sensitive material is also critical. An image forming method described in JP-A No. 10-24654 is one in which an image is formed directly merely by exposing a light-sensitive material to infrared rays (thermally dye forming), however, said method does not refer to an image forming method in which a light-sensitive, material is exposed to light to form a latent image, and said light-sensitive material, in which said latent image is formed, must be subjected to thermal development so as to form an visible image. The present inventive employees have made a great effort to solve the above-mentioned problems and finally found a way to obtain “a blue-black tone” of a formed silver image which is desired to be applicable to a direct appreciation or the medical diagnosis. Solubility of S-1 and S-4 described in JP-A No. 10-24654 is relatively low in organic solvents, since these dyes have four hydroxy groups in their molecules, and therefore, sufficient antihalation and antiirradiation effect can not be obtained. Dyes described in JP-A Nos. 10-36695 and 10-158253 are difficult to commercially produce. Solubility of dyes described in JP-A 10-104779 in an organic solvent is relatively low and the cost for producing them is relatively expensive.
Squarylium dye having a thiopyrylium nucleous (being termed thiopyryliumsquarylium dye in the present invention, while squarylium dye having pyrylium nucleous is termed pyryliumsquarylium dye) is described in U.S. Pat. Nos. 4,508,811, and 5,667,943. However, these patents do not propose nor suggest that said thiopyryliumsquarylium dye can be applied to a silver halide photosensitive material.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a thermally developable photographic light-sensitive material and a silver halide photographic light-sensitive material, capable of producing various preferable photographic characteristics of a formed image, such as a silver image of excellent resolution, less residual color stain, preferable blue-black silver image tone, excellent image stability when stored over a long period of time, employing a dye which is excellent in solubility in an organic solvent, and finally, one which exhibits desirable dispersibility in the form of a solid dispersion or an oil dispersion. Another object of the present invention is to provide a thermally developable photographic light-sensitive material as well as a silver halide photographic light-sensitive material, which are suitably applicable to a dry process by employing said dye, cited above, and an image forming method by which said thermally developable photographic light-sensitive material and said silver halide photographic light-sensitive material are processed, and further, an optical filter having preferable characteristics provided by employing said dye, and still further, a support for a silver halide light-sensitive material provided, employing said dye.
DETAILED DESCRIPTION OF THE INVENTION
The above-mentioned objects of the present invention are attained by the following constitution.
(1) A silver halide photographic light-sensitive material comprising a dye represented by the following formula (1) or formula (2):
wherein A
1
and B
1
each represent substituents other than a naphthalene group; and A
2
and B
2
represent substituents.
(2) The silver halide photographic light-sensitive material of item 1, wherein said dye represented by said formula (1) or said formula (2) is a dye represented by the following formula (3) or formula (4):
wherein R
1
, R
2
, R
3
and R
4
each represent a hydrogen atom or an alkyl group; each of A
3
, B
3
, A
4
and B
4
is symmetrical so that a structure obtained by rotating each of A
3
, B
3
, A
4
and B
4
by 180 degrees around the bond connecting each of A
3
, B
3
, A
4
and B
4
with a carbon atom attached to each of A
3
, B
3
, A
4
and B
4
leads to the same structure as each original structure of A
3
, B
3
, A
4
and B
4
; the sum total of hydroxy group contained in A
3
and B
3
is 0 or 1; and the sum total of hydroxy group contained in A
4
and B
4
is 0 or 1.
(3) The silver halide photographic light-sensitive material of item 2, wherein said dye represented by said formula (3) or said formula (4) is a dye represented by the following formula (5) or formula (6):
wherein R
1
, R
2
, R
3
and R
4
each represent a hydrogen atom or an alkyl group; ZA3, ZB3, ZA4 and ZB4 each represent a group of atoms necessary for forming a 6-membered heterocyclic ring with a carbon atom.
(4) The silver halide photographic light-sensitive material of item 1, wherein said dye is represented by said formula (1).
(5) The silver halide photographic light-sensitive material of item 1, wherein said dye is represented by said formula (2).
(6) The silver halide photographic light-sensitive material of item 5, wherein said dye is represented by
Ikemizu Dai
Tanaka Shinri
Bierman, Muserlian and Lucas
Chea Thorl
Konica Corporation
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