Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
2001-06-26
2003-07-15
Letscher, Geraldine (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S517000, C430S570000, C430S576000, C430S581000
Reexamination Certificate
active
06593074
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide photographic emulsion stable in quality, and/or improved in dyeing property, and/or capable of reducing the amount of an organic solvent to be added, relates to a method for producing a silver halide photographic material containing the silver halide photographic emulsion, relates to a silver halide photographic emulsion stable in quality and/or improved in dyeing property, and relates to a silver halide photographic material containing the silver halide photographic emulsion.
BACKGROUND OF THE INVENTION
Every effort has been expended to improve the quality of the silver halide photographic emulsion and the silver halide photographic material (the increment of sensitivity, the reduction of the residual color after processing, the improvement of the storage stability, etc.). Although the improvement of the quality is being realized, it is still a difficult problem to obtain stably high quality products without unevenness among production lots. With respect to the dyeing, there is still a problem that a photographic material dyes with a dye disadvantageously.
Further, when a sensitizing dye is added to an emulsion by being dissolved in an organic solvent, a lot of organic solvent is required if the solubility of the dye is low.
It is known that the sensitizing dye used for spectral sensitization has a great influence on the performances of the silver halide photographic material. Even a slight structural difference of the sensitizing dye largely affects the photographic performances such as sensitivity, fog, storage stability and residual color but it is difficult to forecast the effects in advance, therefore, many engineers have endeavored to synthesize various kinds of sensitizing dyes and examine the photographic performances.
However, a sensitizing dye which is effective for the stabilization of the quality of a silver halide photographic emulsion and a silver halide photographic material, and/or effective for the improvement of dyeing, and/or effective for the reduction of the addition amount of an organic solvent, and the directions as to how to use the same are difficult problems and the development has been required.
SUMMARY OF THE INVENTION
The objects of the present invention are to provide a silver halide photographic emulsion stable in quality, and/or improved in dyeing property, and/or capable of reducing the amount of an organic solvent to be added, relates to a method for producing a silver halide photographic material containing the silver halide photographic emulsion, relates to a silver halide photographic emulsion stable in quality and/or improved in dyeing property, and relates to a silver halide photographic material containing the silver halide photographic emulsion.
As a result of eager investigation of the present inventors, the above objects of the present invention have been accomplished by the following items (1) to (7):
(1) A silver halide photographic emulsion which comprises at least one dye or sensitizing dye having at least one organic counter ion.
(2) The silver halide photographic emulsion as described in the above item (1), wherein said dye or sensitizing dye has at least two anionic groups and/or at least two positive organic counter ions.
(3) The silver halide photographic emulsion as described in the above item (1) or (2), wherein said dye or sensitizing dye has at least one carboxyl group and at least one sulfo group.
(4) The silver halide photographic emulsion as described in the above item (1), (2) or (3), wherein said dye or sensitizing dye is a merocyanine dye having at least one carboxyl group and at least one sulfo group.
(5) A silver halide photographic material which contains at least one silver halide photographic emulsion layer as described in the above item (1), (2), (3) or (4).
(6) A method of producing a silver halide photographic emulsion, which comprises the step of adding the dye or sensitizing dye as described in the above item (1), (2), (3) or (4) to the silver halide photographic emulsion as the solution of an organic solvent.
(7) A silver halide photographic emulsion which is produced by the method as described in the above item (6), a silver halide photographic material which contains at least one said silver halide photographic emulsion, and a producing method of a silver halide photographic material which contains at least one said silver halide photographic emulsion.
The preferred embodiments of the present invention are described above but these items can be further classified in detail into the following items (1) to (15) including the preferred additional factors.
(1) A silver halide photographic emulsion which comprises at least one dye having at least one organic counter ion.
(2) A silver halide photographic emulsion which comprises at least one sensitizing dye having at least one organic counter ion.
(3) The silver halide photographic emulsion as described in the above item (1) or (2), wherein said dye or sensitizing dye has at least one anionic group and/or at least one positive organic counter ion.
(4) The silver halide photographic emulsion as described in the above item (1), (2) or (3), wherein said dye or sensitizing dye has at least two anionic groups and/or at least two positive organic counter ions.
(5) The silver halide photographic emulsion as described in the above item (1), (2), (3) or (4), wherein said dye or sensitizing dye has at least one anionic group other than a sulfo group.
(6) The silver halide photographic emulsion as described in the above item (1), (2), (3), (4) or (5), wherein said dye or sensitizing dye has at least one anionic group other than a sulfo group and at least one sulfo group.
(7) The silver halide photographic emulsion as described in the above item (1), (2), (3), (4), (5) or (6), wherein said dye or sensitizing dye has at least one carboxyl group and at least one sulfo group.
(8) The silver halide photographic emulsion as described in the above item (1), (2), (3), (4), (5), (6) or (7), wherein said dye or sensitizing dye is a merocyanine dye having at least one carboxyl group and at least one sulfo group.
(9) A silver halide photographic material which comprises at least one silver halide photographic emulsion layer as described in the above item (1), (2), (3), (4), (5), (6), (7) or (8).
(10) A method of producing a silver halide photographic emulsion, which comprises the step of adding the dye or sensitizing dye as described in the above item (1), (2), (3), (4), (5), (6), (7) or (8) to the silver halide photographic emulsion as the solution of an organic solvent.
(11) A silver halide photographic emulsion which is produced by the method as described in the above item (10).
(12) A silver halide photographic material which comprises at least one silver halide photographic emulsion as described in the above item (11).
(13) A method of producing a silver halide photographic material which comprises at least one silver halide photographic emulsion as described in the above item (11).
(14) The silver halide photographic emulsion, the silver halide photographic material containing the silver halide photographic emulsion, the method of producing the silver halide photographic emulsion and the method of producing the silver halide photographic material described in any of the above items (1) to (14), wherein said silver halide photographic emulsion is an emulsion in which tabular grains having an aspect ratio of 2 or more occupying 50% or more (in area).
(15) A photothermographic material comprising at least one kind of light-sensitive silver halide and light-insensitive organic silver salt, wherein the photothermographic material comprises the silver halide photographic emulsion as described in any of the above items (1) to (14), and a method of producing the same.
DETAILED DESCRIPTION OF THE INVENTION
The present invention is described in detail below.
Any dyes can be used in the present invention so long as they have an organic counter ion.
Examples of the dyes include a cyanine dye, a styryl dye, a hemicy
Hikichi Noboru
Hioki Takanori
Birch & Stewart Kolasch & Birch, LLP
Fuji Photo Film Co. , Ltd.
Letscher Geraldine
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