Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Reexamination Certificate
1999-02-10
2002-01-22
Baxter, Janet (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
C430S567000, C430S569000, C430S607000
Reexamination Certificate
active
06340562
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a silver halide photographic emulsion and a silver halide photographic light-sensitive material with high sensitivity, low fog and excellent pressure resistance.
BACKGROUND OF THE INVENTION
Recently, with regard to development processing of silver halide light sensitive photographic materials, there have been demands for further reduction of the processing time and disposal of processing effluent.
In the field of medical use, for example, the amount of time for X-ray photographing is rapidly increasing due to increased use of X-rays for diagnosis and inspection in general medical examinations, as well as increased popularity of periodical health check-ups and clinical surveys. Accordingly, it have been strongly desired to reduce the processing time and disposal of processing effluent.
In response to demand for rapid access for the silver halide photographic light-sensitive material, it is necessary to reduce the processing time of development, fixation, washing and drying. When subjected to rapid processing, pressure to the silver halide photographic light-sensitive material caused by a transferring roller and caused by contacting with a transferring guide becomes larger. Therefore, it is necessary to enhance pressure resistance characteristic of the silver halide photographic light-sensitive material to meet the rapid processing.
With respect to the known methods to enhance the pressure resistance characteristic, there have been a method of employing high iodide content silver halide layer and providing electron trapping capability by occluding a metallic ion in the interior of silver halide grain and a method of increasing an amount of binder in an emulsion layer to reduce the pressure to silver halide grain. However, high iodide content silver halide layer and increased amount of binder lead to lowering processing capability and are not sufficient from the viewpoint of enhancing the pressure resistance characteristic in rapid processing access.
With silver halide grains of a smaller size which is sensitized, the pressure resistance characteristic is improved. However, with reduction sensitization, selenium sensitization and tellurium sensitization etc., increased sensitization is accompanied with increased fog, so that further improvement is sought.
SUMMARY OF THE INVENTION
An object of the present invention is to provide the silver halide photographic light-sensitive material with enhanced sensitivity and reduced fog and capable of being processed in rapid processing.
DETAILED DESCRIPTION OF THE INVENTION
Above object of the invention could be attained by the following constitution:
(1) A silver halide photographic emulsion comprising silver halide grains prepared by adding a compound capable of forming cross-linkage with gelatin to said silver halide grains before the completion of chemical sensitization after the formation of the silver halide grains.
(2) The silver halide photographic emulsion of item 1, wherein the compound capable of forming cross-linkage with gelatin is a high molecular compound.
(3) The silver halide photographic emulsion of item 1, wherein said silver halide grains are prepared by adding an oxazoline type high molecular compound before the completion of chemical sensitization after the formation of the silver halide grains.
(4) The silver halide photographic emulsion of item 1, wherein said silver halide grains are prepared by adding a polysaccharide compound having cross-linkage forming group with gelatin to said silver halide grains before the completion of chemical sensitization after the formation of the silver halide grains.
(5) The silver halide photographic emulsion of item 1, wherein said silver halide grains are subjected to reduction sensitization.
(6) A silver halide photographic light-sensitive material comprising a support having thereon a silver halide light-sensitive e emulsion n layer, wherein said silver halide emulsion layer contains the silver halide emulsion of item 1.
(7) The silver halide photographic light-sensitive material of item 6, wherein an amount of gelatin added in the silver halide photographic light-sensitive material is 0.5 to 2.0 g per m
2
of one side on the support.
(8) The silver halide emulsion of item 3, wherein the oxazoline type high molecular compound has weight average molecular weight of 10000 to 1000000.
(9) The silver halide emulsion of item 3, wherein the oxazoline type high molecular compound contains a repeating units represented by following formula (1):
wherein R
1
, R
2
, R
3
and R
4
represent each a substituent group; R
5
represents a non-cyclic organic group having an unsaturated bonding group.
(10) The silver halide emulsion of item 9, wherein the substituent group is a hydrogen atom, a halogen atom, an alkyl group, an aralkyl group, an aryl group or an alkoxy group.
(11) The silver halide emulsion of item 9, wherein the oxazoline type high molecular compound is water soluble polymer polymerized by 5 to 50% by weight of a monomer having the repeating unit of formula (1) based on total amount of the monomer and not less than 50% by weight of a hydrophilic monomer based on total amount of the monomer.
(12) The silver halide emulsion of item 9, wherein the oxazoline type high molecular compound is polymer latex polymerized by 5 to 30% by weight of a monomer having the repeating unit of formula (1) based on total amount of the monomer.
(13) The silver halide emulsion of item 4, wherein the polysaccharide compound is dextran, dextrin or cyclodextrin having ring structure.
(14) The silver halide emulsion of item 13, wherein the polysaccharide compound is the cyclodextrin having ring structure.
(15) The silver halide emulsion of item 1, wherein added amount of the compound capable of forming cross-linkage with gelatin is 0.01 to 10 mmol per 1 g of gelatin.
(16) The silver halide emulsion of item 10, wherein added amount of the compound capable of forming cross-linkage with gelatin is 0.01 to 10 mmol per 1 g of gelatin.
(17) The silver halide emulsion of item 15, wherein the added amount is 0.05 to 0.5 mmol per 1 g of gelatin.
A compound capable of forming cross-linkage with gelatin (hereinafter referred to as gelatin cross-linkable compound) is a compound having at least one group capable of forming cross-linkage with gelatin (hereinafter referred to as gelatin cross-linkable group) which react with an amino group and a carboxy group existing in gelatin molecule to form cross-linkage. As gelatin cross-linkable group, are cited aldehyde group, carboxyl group, —NHR (R represents a hydrogen atom or substituents), 2,4-dichloro-6-oxy-s-triazine group, epichlorohydrin group, epibromohydrin group, epifluorohydrin group, epiiodohydrin group, ethylchloroformate group, phenylchloroformate group. active vinyl group, oxazoline group, N-methylol group, acrylamide group, methacrylamide group (one of two hydrogen atoms of a amide group may be substituted), ethyleneimine group, carbodiimide group, and epoxy group, but are preferably cited 2,4-dichloro-6-oxy-s-triazine group and oxazoline group, etc. Above mentioned gelatin cross-linkable compound may possess plural gelatin cross-linkable groups, may be a low molecular compound or a high molecular compound, and may be a monomer or a polymer. Among them, the high molecular compound having repeating unit is preferable, for examples, an oxazoline type high molecular compound and a polysaccharide compound having gelatin cross-linkable groups are preferable.
The oxazoline type high molecular compound according to the invention is a polymer latex containing oxazolines as a monomer unit in it's molecule or a water soluble polymer containing oxazolines as a monomer unit in it's molecule. Weight average molecular weight of the oxazoline type high molecular compound is 10,000 to 1,000,000, preferably 10,000 to 150,000.
The oxazoline containing polymer latex (hereinafter referred to as latex polymer) used in the invention is a polymer having repeating unit of the monomer represented by the following formula
Baxter Janet
Bierman Jordan B.
Bierman, Muserlian and Lucas
Konica Corporation
Walke Amanda C.
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