Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Identified backing or protective layer containing
Reexamination Certificate
2001-06-11
2003-02-25
Schilling, Richard L. (Department: 1752)
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Identified backing or protective layer containing
C430S531000, C430S536000, C430S619000, C430S961000, C430S965000
Reexamination Certificate
active
06524781
ABSTRACT:
FIELD OF THE INVENTION
the present invention relates to photothermographic material and an image forming method by the use thereof.
BACKGROUND OF THE INVENTION
It has been known to provide a protective layer on an image forming layer of a photothermographic material. The photothermographic material employs the fact that the image forming layer softens upon heating, enhancing mobility of imaging constituents to promote development. However, problems occur in that the image forming layer which has been soften on heating easily adheres onto the thermal processing drum, often causing image defects, so that a protective layer is required to minimize this.
Further, when subjecting the photothermographic material to thermal processing, odor is caused upon heating, making for worsened environment and it is therefore known to provide a deodorizing apparatus in the thermal processor. One of the causes of the odor is known to be attributed to an aldehyde adduct to alcohol, as described in U.S. Pat. No. 5,469,238. However, there has been no idea of providing a function for positive prevention of the odor from the image forming layer.
In the protective layer of the photothermographic material, coated by using solvents mainly containing water, gelatin has been used but an amino group contained in the gelatin has not been known to have a more or less deodorizing action. Further, although there are known incorporation of a benztriazole compound as an antifoggant into the protective layer of a photographic material, nothing has been known with respect to a deodorizing function of the benztriazole compound. It was also confirmed, by the inventors of this invention, that the benztriazole compound in an amount commonly known in the art exhibited substantially no deodorizing effect.
SUMMARY OF THE INVENTION
In view of the foregoing, the present invention was achieved. Thus, it is an object of the present invention to provide a photothermographic material which one which exhibits superior characteristics including sensitivity and fogging, and an image forming method by the use of the same.
The object of the invention can be accomplished by the following constitution:
(1) A photothermographic material comprising on a support an image forming layer containing a light sensitive silver halide, an organic silver salt and a reducing agent, wherein a layer containing a compound capable of trapping a material causing odor is provided on the image forming layer;
(2) A photothermographic material comprising on a support an image forming layer containing a light sensitive silver halide, an organic silver salt and a reducing agent, wherein a layer containing a compound capable of trapping a material causing odor is provided between the image forming layer and a protective layer;
(3) A photothermographic material comprising on a support an image forming layer containing a light sensitive silver halide, an organic silver salt and a reducing agent, wherein a protective layer, a layer containing a compound capable of trapping a material causing odor and the image forming layer are provided in this order from the outermost layer side, an interlayer is provided between the protective layer and the layer containing a compound capable of trapping a material causing odor, or between the layer containing a compound capable of trapping a material causing odor and the image forming layer;
(4) The photothermographic material described in any one of (1) through (3), wherein the material causing odor is an aldehyde compound or its alcohol adduct, or a carbonyl compound such as an organic acid; and the compound capable of trapping a material causing odor being a compound capable of undergoing nucleophilic addition;
(5) The photothermographic material described in any one of (1) through (4), wherein the compound capable of trapping a material causing odor is contained in an amount of not less than 0.2 g/m
2
;
(6) An image forming method, wherein the photothermographic material described in any one of (1) through (5) is subjected to a thermal processing.
DETAILED DESCRIPTION OF THE INVENTION
Photothermographic Material
The photothermographic material according to this invention is characterized in that a layer containing a compound capable of trapping a material causing odor (hereinafter, also denoted as an odor trapping compound) is provided on the image forming layer (hereinafter, also denoted as a light sensitive layer).
The photothermographic material of this invention comprises, on the support, basically a light sensitive layer and a protective layer. The odor trapping compound may be contained in the protective layer or a layer containing the odor trapping compound may be provided between the protective layer and the light sensitive layer. In this case, an adhesion-enhancing layer may be provided between these layers to enhance adhesion property of each layer. In cases where the odor trapping compound adversely affects image formation, it is preferred to provide a diffusion-proofing layer between the layer containing the odor trapping compound and the light sensitive layer. A sublayer may be provided between the light sensitive layer and the support to enhance adhesion properties of both layers, a backing layer may be coated on the back side of the support, and the light sensitive layer may be comprised of single layer or plural layers. Odor causing material
In this invention, materials causing odor include, for example, aldehydes such as formaldehyde, acetoaldehyde and butylaldehyde, and their alcohol adducts; and carbonyl compounds such as formic acid and oxalic acid, which are usually toxic to the human body and cause pungent odor, deteriorating sanitary of surroundings. Specifically, materials causing odor are aldehydes evaporating from the photothermographic film, such as lower aldehyde compounds, generally having a molecular weight of 30 to 300.
Odor Trapping Ccompound
Odor trapping compounds used in this invention are those capable of undergoing nucleophilic addition to the compounds causing odor described above, and preferably those which contain an —NH— bond in the molecule. Of the compounds containing the —NH— bond in the molecule, specifically, compounds containing an amino bond, a urea bond, an amido bond or an imido bond are preferred. Examples of the compound containing an amino bond include hexamethylenediamine, morpholine, 2-amino-4,5-dicyanoimidazole, 3-azahexane-1,6-diamine, 2-acrylamido-2-methylpropanesulfonic acid, &agr;-amino-caprolactam, acetoguanamine, guanine, acetoaldehyde ammonia, 4,7-diazadecane-1,10-diamine, pyrrolidine, piperidine, piperazine, polyethyleneimine, polyarylamine, polyvinylamine, and polyaniline. Examples of the compound containing a urea bond include uera, ethylurea, dimethylurea, diethylurea, ethyleneurea, guanylurea, guanylthiourea, azodicarbonamide, glycolylurea, and acetylurea. Examples of the compound containing an amido bond include formamide, acetoamide, benzamide, oxamide, oxamic acid, succinic acid amide, and malonamide. Examples of the compound containing an imido bond include succiimide, phthalimide, maleimide, 1-methylol-5,5-dimethylhydantoin, allantoin compound, isocyanuric acid, azole compounds, azine compounds, and pyridazine compounds.
The azole compounds include a diazole compound, triazole compound, and thiadiazole compound. Of these are preferred the diazole compound and triazole compound. Examples of the diazole compound include pyrazolone compounds such as 3-methyl-5-pyrazolone, 1,3-dimethyl-5-pyrazolone3-methyl-1-phenyl-5-pyrazolone, 3-phenyl-6-pyrazolone and 3-methyl-1-(3-sulfophenyl)-5-pyrazolone; and pyrazolo compounds such as pyrazolo, 3-methylpyrazole, 1,4-dimethylpyrazole, 3,5-dimethylpyrazole, 3,5-dimethyl-1-phenylpyrazole, 3-aminopyrazole, 5-amino-3-methylpyrazole, 3-methylpyrazole-5-carboxylic acid, 3-methylpyrazole-5-carboxylic acid methyl ester, 3-methylpyrazole-5-carboxylic acid ethyl ester,3,5-methylpyrazoledicarboxylic acid. Examples of the triazole compound include 1,2,3-triazole, 1,2,4-triazole, 3-n-butyl-1,2,4-triazole, 3,5-dimethyl-1,2,4-t
Bierman, Muserlian and Lucas
Konica Corporation
Schilling Richard L.
LandOfFree
Photothermographic material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photothermographic material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photothermographic material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3171364