EP1420293A1 - Stabilisatoren zur Verwendung in thermographischen Aufzeichnungsmaterialien die im wesentlichen lichtunempfindlich sind - Google Patents
Stabilisatoren zur Verwendung in thermographischen Aufzeichnungsmaterialien die im wesentlichen lichtunempfindlich sind Download PDFInfo
- Publication number
- EP1420293A1 EP1420293A1 EP03104030A EP03104030A EP1420293A1 EP 1420293 A1 EP1420293 A1 EP 1420293A1 EP 03104030 A EP03104030 A EP 03104030A EP 03104030 A EP03104030 A EP 03104030A EP 1420293 A1 EP1420293 A1 EP 1420293A1
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- European Patent Office
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- Prior art date
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- 125000003107 substituted aryl group Chemical group 0.000 claims abstract description 17
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- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 10
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- 125000002837 carbocyclic group Chemical group 0.000 description 1
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- 229920000457 chlorinated polyvinyl chloride Polymers 0.000 description 1
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- 229940116901 diethyldithiocarbamate Drugs 0.000 description 1
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- 239000002612 dispersion medium Substances 0.000 description 1
- TVACALAUIQMRDF-UHFFFAOYSA-N dodecyl dihydrogen phosphate Chemical group CCCCCCCCCCCCOP(O)(O)=O TVACALAUIQMRDF-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 235000019277 ethyl gallate Nutrition 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 235000004515 gallic acid Nutrition 0.000 description 1
- 229940074391 gallic acid Drugs 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
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- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
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- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- IBKQQKPQRYUGBJ-UHFFFAOYSA-N methyl gallate Natural products CC(=O)C1=CC(O)=C(O)C(O)=C1 IBKQQKPQRYUGBJ-UHFFFAOYSA-N 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000004123 n-propyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 150000002894 organic compounds Chemical group 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- IJAPPYDYQCXOEF-UHFFFAOYSA-N phthalazin-1(2H)-one Chemical compound C1=CC=C2C(=O)NN=CC2=C1 IJAPPYDYQCXOEF-UHFFFAOYSA-N 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 150000003021 phthalic acid derivatives Chemical class 0.000 description 1
- 150000003022 phthalic acids Chemical class 0.000 description 1
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- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 235000010388 propyl gallate Nutrition 0.000 description 1
- 239000000473 propyl gallate Substances 0.000 description 1
- 229940075579 propyl gallate Drugs 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- XGGHFHFZXMMSFA-UHFFFAOYSA-N s-(1-sulfanylpyrazol-3-yl)thiohydroxylamine Chemical compound NSC=1C=CN(S)N=1 XGGHFHFZXMMSFA-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- AQRYNYUOKMNDDV-UHFFFAOYSA-M silver behenate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCCCCCC([O-])=O AQRYNYUOKMNDDV-UHFFFAOYSA-M 0.000 description 1
- 229940054334 silver cation Drugs 0.000 description 1
- YRSQDSCQMOUOKO-KVVVOXFISA-M silver;(z)-octadec-9-enoate Chemical compound [Ag+].CCCCCCCC\C=C/CCCCCCCC([O-])=O YRSQDSCQMOUOKO-KVVVOXFISA-M 0.000 description 1
- CLDWGXZGFUNWKB-UHFFFAOYSA-M silver;benzoate Chemical compound [Ag+].[O-]C(=O)C1=CC=CC=C1 CLDWGXZGFUNWKB-UHFFFAOYSA-M 0.000 description 1
- MNMYRUHURLPFQW-UHFFFAOYSA-M silver;dodecanoate Chemical compound [Ag+].CCCCCCCCCCCC([O-])=O MNMYRUHURLPFQW-UHFFFAOYSA-M 0.000 description 1
- LTYHQUJGIQUHMS-UHFFFAOYSA-M silver;hexadecanoate Chemical compound [Ag+].CCCCCCCCCCCCCCCC([O-])=O LTYHQUJGIQUHMS-UHFFFAOYSA-M 0.000 description 1
- ORYURPRSXLUCSS-UHFFFAOYSA-M silver;octadecanoate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCC([O-])=O ORYURPRSXLUCSS-UHFFFAOYSA-M 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 125000000472 sulfonyl group Chemical group *S(*)(=O)=O 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 description 1
- 235000015523 tannic acid Nutrition 0.000 description 1
- 229920002258 tannic acid Polymers 0.000 description 1
- 229940033123 tannic acid Drugs 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- AUHHYELHRWCWEZ-UHFFFAOYSA-N tetrachlorophthalic anhydride Chemical compound ClC1=C(Cl)C(Cl)=C2C(=O)OC(=O)C2=C1Cl AUHHYELHRWCWEZ-UHFFFAOYSA-N 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000016776 visual perception Effects 0.000 description 1
- 239000003232 water-soluble binding agent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
- G03C1/498—Photothermographic systems, e.g. dry silver
- G03C1/4989—Photothermographic systems, e.g. dry silver characterised by a thermal imaging step, with or without exposure to light, e.g. with a thermal head, using a laser
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
- G03C1/498—Photothermographic systems, e.g. dry silver
- G03C1/49836—Additives
- G03C1/49845—Active additives, e.g. toners, stabilisers, sensitisers
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C2200/00—Details
- G03C2200/40—Mercapto compound
Definitions
- the present invention concerns stabilizers for use in substantially light-insensitive thermographic recording materials.
- Thermography is an image-forming process including a heating step and hence includes photothermography in which the image-forming process includes image-wise exposure and direct thermal processes in which the image-forming process includes an image-wise heating step.
- direct thermal printing a visible image pattern is produced by image-wise heating of a recording material.
- EP-A 0 713 133 discloses a thermal imaging system consisting of (i) a donor element comprising on a support a donor layer containing a binder and a thermotransferable reducing agent capable of reducing a silver source to metallic silver and (ii) a receiving element comprising on a support a receiving layer comprising a silver source, capable of being reduced by means of heat in the presence of a reducing agent, a binder and a stabiliser selected from the group consisting of benzotriazoles, heterocyclic mercaptanes, sulphinic acids, 1,3,4-triazo-indinolines, 1,3-dinitroaryl compounds, 1,2,3-triazoles, phthalic acids and phthalic acid derivatives.
- EP-A 0 713 133 discloses that preferred heterocyclic mercaptanes are mercaptotetrazoles corresponding to the following general formula (C) : and discloses the following 1-(5-mercapto-1-tetrazolyl)-acetyl compounds:
- EP-A 0 901 040 discloses a substantially light-insensitive monosheet recording material comprising a support and a thermosensitive element containing a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith and a binder, characterized in that said thermosensitive element further contains an unsaturated carbocyclic or heterocyclic stabilizer compound substituted with a -SA group where A is hydrogen, a counterion to compensate the negative charge of the thiolate group or a group forming a symmetrical or an asymmetrical disulfide and said recording material is capable of producing prints with a numerical gradation value defined as the quotient of the fraction (2.5 - 0.1)/(E 2.5 - E 0.1 ) greater than 2.3, where E 2.5 is the energy in Joule applied in a dot area of 87 ⁇ m x 87 ⁇ m of the imaging layer that produces an optical density value of 2.5, and E 0.1 is the energy in Joule applied in a dot area of the
- WO 94/16361 discloses a multilayer heat-sensitive material which comprises: a color-forming layer comprising: a color-forming amount of finely divided, solid colorless noble metal or iron salt of an organic acid distributed in a carrier composition; a color-developing amount of a cyclic or aromatic organic reducing agent, which at thermal copy and printing temperatures is capable of a color-forming reaction with the noble metal or iron salt; and an image-toning agent; characterized in that (a) the carrier composition comprises a substantially water-soluble polymeric carrier and a dispersing agent for the noble metal or iron salt and (b) the material comprises a protective overcoating layer for the color-forming layer.
- WO 94/16361 discloses that suitable antifoggants are well-known photographic anti-foggants such as mercaptobenzotriazole, chromate, oxalate, citrate, carbonate, benzotriazole (BZT), 5-methylbenzotriazole, 5,6-dimethylbenzotriazole, 5-bromobenzotriazole, 5-chlorobenzotriazole, 5-nitro-benzotriazole, 4-nitro-6-chlorobenzotriazole, 5-nitro-6-chlorobenzotriazole, 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene, benzimidazole, 2-methylbenzimidazole, 5-nitrobenzimidazole, 1-phenyl-5-mercaptotetrazole, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole, 2-mercaptobenzoxazole, 2-mercaptothiazoline, 2-mercapto-4-methyl-6,6'-dimethylpyr
- thermographic imaging element comprising a substrate having coated on at least one surface thereof a thermographic imaging system comprising at least one layer comprising light-insensitive organic silver salt; reducing agent for silver ion; binder; toner; and a dye which absorbs radiation in the wavelength range of 750-1100 nm, wherein said at least one layer comprising said light-insensitive organic silver salt forms an image density greater than about 1.0 when exposed to 0.10 - 2.0 joules/cm 2 of said radiation in 0.20 to 200 microseconds.
- WO 96/10213 does not disclose a stabilizer against the influence of light, but mentions the optional incorporation of benzotriazole in the thermographic imaging element, but only exemplifies the incorporation of benzotriazole.
- thermographic recording materials contain the imaging-forming components both before and after image formation and unwanted image-forming must be hindered both during storage prior to printing and in prints exposed to light on light-boxes e.g. during examination by radiologists. Furthermore, such stabilization must take place without adverse effects upon the image quality particularly the image tone. Thermographic printers are being introduced with ever higher throughputs, which require thermographic recording materials able to provide stabilization without an adverse effect on the image quality at such faster throughputs. There is therefore a need for stabilizers which fulfil these requirements.
- thermosensitive element containing a substantially light-insensitive organic silver salt, an organic reducing agent therefor in thermal working relationship therewith, a binder and at least one stabilizer selected from the group consisting of 1-(5-mercapto-1-tetrazolyl)-acetyl compounds represented by formula (I): wherein R 1 is -NR 2 R 3 , -OR 4 or an optionally substituted aryl or heteroaryl group; R 2 is hydrogen or an optionally substituted alkyl, aryl or heteroaryl group; R 3 is an optionally substituted aryl or heteroaryl group; and R 4 is an optionally substituted aryl group; and compounds with two or more groups represented by formula (II) : where Q comprises the necessary atoms to form a 5- or 6-membered unsaturated heterocyclic ring, A is hydrogen, a counterion to compensate
- alkyl means all variants possible for each number of carbon atoms in the alkyl group i.e. for three carbon atoms: n-propyl and isopropyl; for four carbon atoms: n-butyl, isobutyl and tertiary-butyl; for five carbon atoms: n-pentyl, 1,1-dimethylpropyl, 2,2-dimethylpropyl and 2-methyl-butyl etc.
- the L*, a* and b* CIELAB-values are defined in ASTM Norm E179-90 in a R(45/0) geometry with evaluation according to ASTM Norm E308-90.
- Substantially light-insensitive means not intentionally light sensitive.
- substantially water-free condition means heating at a temperature of 80 to 250°C.
- substantially water-free condition means that the reaction system is approximately in equilibrium with water in the air, and water for inducing or promoting the reaction is not particularly or positively supplied from the exterior to the element. Such a condition is described in T.H. James, "The Theory of the Photographic Process", Fourth Edition, Macmillan 1977, page 374.
- thermosensitive element as used herein is that element which contains all the ingredients which contribute to image formation.
- the thermosensitive element contains one or more substantially light-insensitive organic silver salts, one or more reducing agents therefor in thermal working relationship therewith and a binder.
- the element may comprise a layer system in which the above-mentioned ingredients may be dispersed in different layers, with the proviso that the substantially light-insensitive organic silver salts are in reactive association with the reducing agents i.e. during the thermal development process the reducing agent must be present in such a way that it is able to diffuse to the particles of substantially light-insensitive organic silver salt so that reduction to silver can occur.
- Such materials include the possibility of one or more substantially light-insensitive organic silver salts and/or one of more organic reducing agents therefor being encapsulated in heat-responsive microcapsules, such as disclosed in EP-A 0 736 799 herein incorporated by reference.
- the substantially light-insensitive black and white monosheet thermographic recording material of the present invention can contain at least one 1-(5-mercapto-1-tetrazolyl)-acetyl compound represented by formula (I): wherein R 1 is -NR 2 R 3 , -OR 4 or an optionally substituted aryl or heteroaryl group; R 2 is hydrogen or an optionally substituted alkyl, aryl or heteroaryl group; R 3 is an optionally substituted aryl or heteroaryl group; and R 4 is an optionally substituted aryl group.
- Preferred substituents for the alkyl, aryl and heteroaryl groups include alkyl, ester, acyl, carbonato-alkyl, alkoxy, -S-alkyl, hydroxy and mercapto groups.
- the at least one stabilizer is
- the 1-(5-mercapto-1-tetrazolyl)-acetyl (MTA) compounds can be prepared from readily available starting materials using standard organic chemistry techniques known to one skilled in the art and available in such reference books such as Houben-Weyl.
- Suitable 1-(5-mercapto-1-tetrazolyl)-acetyl (MTA) compounds according to formula (I), according to the present invention include:
- the substantially light-insensitive black and white monosheet thermographic recording material of the present invention can contain at least one compound with two or more groups represented by formula (II) : where Q comprises the necessary atoms to form a 5- or 6-membered unsaturated heterocyclic ring, A is hydrogen, a counterion to compensate the negative charge of the thiolate group or two or more A groups provide a linking group between the two or more groups represented by formula (II).
- At least one of the 5- or 6-membered unsaturated heterocyclic ring is a pyridine, a pyrazine, a pyrimidine, a triazine, a pyrrole, a 1,2,3-triazole, a 1,2,4-triazole, a tetrazole, an oxadiazole, a thiadiazole, an oxazole, an iso-oxazole, a thiazole, an iso-thiazole or an imidazole ring.
- Such rings may also be annelated with an aromatic ring system.
- alkyl group is preferably an optionally substituted alkyl group, an optionally substituted alkyl group in which at least one of the non-terminal main chain carbon atoms is substituted with an oxygen or a sulfur atom, an optionally substituted aryl group, an optionally substituted alkyl-aryl-alkyl group, an optionally substituted alkyl-heteroaryl-alkyl group, an optionally substituted alkyl-COO-alkyl-OOC-alkyl group, an optionally substituted alkyl-O-COO-alkyl group, an optionally substituted alkyl-CONH-alkyl group, or an optionally substituted alkyl-COO-aryl-OOC-alkyl group.
- Preferred substituents for the alkyl, aryl and heteroaryl groups include alkyl, alkoxy, -S-alkyl, hydroxy and mercapto groups.
- the at least one compound according to formula (II) is represented by formula (IV): wherein R 5 has the same meaning as in formula (III); the two R 5 groups may be the same or different; and L 1 is a linking group.
- L 1 is preferably an optionally substituted alkyl group, an optionally substituted alkyl group in which at least one of the non-terminal main chain carbon atoms is substituted with an oxygen or a sulfur atom, an optionally substituted aryl group, an optionally substituted alkyl-aryl-alkyl group, an optionally substituted alkyl-heteroaryl-alkyl group, an optionally substituted alkyl-COO-alkyl-OOC-alkyl group, an optionally substituted alkyl-O-COO-alkyl group, an optionally substituted alkyl-CONH-alkyl group, or an optionally substituted alkyl-COO-aryl-OOC-alkyl group.
- Preferred substituents for the alkyl, aryl and heteroaryl groups include alkyl, alkoxy, -S-alkyl, hydroxy and mercapto groups.
- the at least one compound according to formula (II) is represented by formula (V): wherein R 6 has the same meaning as in formula (III); the two R 6 groups may be the same or different; and L 2 is a linking group.
- L 2 is preferably an optionally substituted alkyl group, an optionally substituted alkyl group in which at least one of the non-terminal main chain carbon atoms is substituted with an oxygen or a sulfur atom, an optionally substituted aryl group, an optionally substituted alkyl-aryl-alkyl group, an optionally substituted alkyl-heteroaryl-alkyl group, an optionally substituted alkyl-COO-alkyl-OOC-alkyl group, an optionally substituted alkyl-O-COO-alkyl group, an optionally substituted alkyl-CONH-alkyl group, or an optionally substituted alkyl-COO-aryl-OOC-alkyl group.
- Preferred substituents for the alkyl, aryl and heteroaryl groups include alkyl, alkoxy, -S-alkyl, hydroxy and mercapto groups.
- the at least one compound according to formula (II) is represented by formula (VI): wherein L 3 is a linking group.
- L 3 is preferably an optionally substituted alkyl group, an optionally substituted alkyl group in which at least one of the non-terminal main chain carbon atoms is substituted with an oxygen or a sulfur atom, an optionally substituted aryl group, an optionally substituted alkyl-aryl-alkyl group, an optionally substituted alkyl-heteroaryl-alkyl group, an optionally substituted alkyl-COO-alkyl-OOC-alkyl group, an optionally substituted alkyl-O-COO-alkyl group, an optionally substituted alkyl-CONH-alkyl group, or an optionally substituted alkyl-COO-aryl-OOC-alkyl group.
- Preferred substituents for the alkyl are preferably an optionally substituted alkyl group, an optionally substituted alkyl group in which at
- the at least one compound according to formula (II) is represented by formula (VII): wherein A has the same meaning as in formula (II) and L 4 is a linking group.
- L 4 is preferably an optionally substituted alkyl group, an optionally substituted alkyl group in which at least one of the non-terminal main chain carbon atoms is substituted with an oxygen or a sulfur atom, an optionally substituted aryl group, an optionally substituted alkyl-aryl-alkyl group, an optionally substituted alkyl-heteroaryl-alkyl group, an optionally substituted alkyl-COO-alkyl-OOC-alkyl group, an optionally substituted alkyl-O-COO-alkyl group, an optionally substituted alkyl-CONH-alkyl group, or an optionally substituted alkyl-COO-aryl-OOC-alkyl group.
- Preferred substituents for the alkyl, aryl and heteroaryl groups include alkyl, alkoxy, -S-alkyl, hydroxy and mercapto groups.
- the at least one stabilizer is: or
- Suitable compounds represented by formula (II), according to the present invention include:
- the organic silver salts are not double organic salts containing a silver cation associated with a second cation e.g. magnesium or iron ions.
- At least one of the organic silver salts is a substantially light-insensitive silver salt of an organic carboxylic acid.
- At least one of the organic silver salts is a substantially light-insensitive silver salt of an aliphatic carboxylic acids known as a fatty acid, wherein the aliphatic carbon chain has preferably at least 12 C-atoms, e.g. silver laurate, silver palmitate, silver stearate, silver hydroxystearate, silver oleate and silver behenate, which silver salts are also called "silver soaps".
- Other silver salts of an organic carboxylic acid as described in GB-P 1,439,478, e.g. silver benzoate may likewise be used to produce a thermally developable silver image.
- Combinations of different silver salt of an organic carboxylic acids may also be used in the present invention, as disclosed in EP-A 964 300.
- Organic silver salts may be dispersed by standard dispersion techniques. Ball mills, bead mills, microfluidizers, ultrasonic apparatuses, rotor stator mixers etc. have been found to be useful in this regard. Mixtures of organic silver salt dispersions produced by different techniques may also be used to obtain the desired thermographic properties e.g. of coarser and more finely ground dispersions of organic silver salts.
- the reducing agent is an organic compound containing at least one active hydrogen atom linked to O, N or C, such as is the case with, aromatic di- and tri-hydroxy compounds.
- 1,2-dihydroxybenzene derivatives such as catechol, 3-(3,4-dihydroxyphenyl) propionic acid, 1,2-dihydroxybenzoic acid, gallic acid and esters e.g. methyl gallate, ethyl gallate, propyl gallate, tannic acid, and 3,4-dihydroxy-benzoic acid esters are preferred, with those described in EP-A 0 692 733 and EP-A 0 903 625 being particularly preferred.
- Combinations of reducing agents may also be used that on heating become reactive partners in the reduction of the one or more substantially light-insensitive organic silver salt.
- combinations of sterically hindered phenols with sulfonyl hydrazide reducing agents such as disclosed in US 5,464,738; trityl hydrazides and formyl-phenyl-hydrazides such as disclosed in US 5,496,695; trityl hydrazides and formyl-phenyl-hydrazides with diverse auxiliary reducing agents as disclosed in US 5,545,505, US 5,545,507 and US 5,558,983; acrylonitrile compounds as disclosed in US 5,545,515 and US 5,635,339; and 2-substituted malonodialdehyde compounds as disclosed in US 5,654,130.
- thermosensitive element Binder of the thermosensitive element
- the film-forming binder of the thermosensitive element may be all kinds of natural, modified natural or synthetic resins or mixtures of such resins, in which the at least one organic silver salt can be dispersed homogeneously either in aqueous or solvent media: e.g.
- cellulose derivatives starch ethers, galactomannan, polymers derived from ⁇ , ⁇ -ethylenically unsaturated compounds such as polyvinyl chloride, after-chlorinated polyvinyl chloride, copolymers of vinyl chloride and vinylidene chloride, copolymers of vinyl chloride and vinyl acetate, polyvinyl acetate and partially hydrolyzed polyvinyl acetate, polyvinyl alcohol, polyvinyl acetals that are made from polyvinyl alcohol as starting material in which only a part of the repeating vinyl alcohol units may have reacted with an aldehyde, preferably polyvinyl butyral, copolymers of acrylonitrile and acrylamide, polyacrylates, polymethacrylates, polystyrene and polyethylene or mixtures thereof.
- aldehyde preferably polyvinyl butyral
- copolymers of acrylonitrile and acrylamide copolymers of acrylonitrile and
- thermographic recording materials are: polyvinyl alcohol, polyacrylamide, polymethacrylamide, polyacrylic acid, polymethacrylic acid, polyvinylpyrrolidone, polyethyleneglycol, proteinaceous binders, polysaccharides and water-soluble cellulose derivatives.
- a preferred water-soluble binder for use in the thermographic recording materials of the present invention is gelatine.
- the binder to organic silver salt weight ratio is preferably in the range of 0.2 to 7, and the thickness of the thermosensitive element is preferably in the range of 5 to 50 ⁇ m. Binders are preferred which do not contain additives, such as certain antioxidants (e.g. 2,6-di-tert-butyl-4-methylphenol), or impurities which adversely affect the thermographic properties of the thermographic recording materials in which they are used.
- additives such as certain antioxidants (e.g. 2,6-di-tert-butyl-4-methylphenol), or impurities which adversely affect the thermographic properties of the thermographic recording materials in which they are used.
- thermosensitive element contains a toning agent, which enables a neutral black image tone to be obtained in the higher densities and neutral grey in the lower densities.
- thermosensitive element further contains a toning agent selected from the group consisting of phthalimides, phthalazinones, benzoxazine diones and naphthoxazine diones e.g.
- phthalimides and phthalazinones within the scope of the general formulae described in US 4,082,901; the toning agents described in US 3,074,809, 3,446,648 and 3,844,797; and the heterocyclic toner compounds of the benzoxazine dione or naphthoxazine dione type as disclosed in GB 1,439,478, US 3,951,660 and US 5,599,647, herein incorporated by reference.
- the substantially light-insensitive thermographic material contains a thermosensitive element, the thermosensitive element containing one or more toning agents selected from the group consisting of phthalazinone, benzo[e][1,3]oxazine-2,4-dione, 7-methyl-benzo[e][1,3]oxazine-2,4-dione, 7-methoxy-benzo[e][1,3]oxazine-2,4-dione and 7-(ethylcarbonato)-benzo[e][1,3]oxazine-2,4-dione.
- phthalazinone benzo[e][1,3]oxazine-2,4-dione
- 7-methyl-benzo[e][1,3]oxazine-2,4-dione 7-methoxy-benzo[e][1,3]oxazine-2,4-dione
- thermographic recording material further contains an auxiliary antifoggant to obtain improved shelf-life and reduced fogging.
- the thermographic recording material further contains an antifoggant selected from the group consisting of benzotriazole, substituted benzotriazoles and aromatic polycarboxylic acid such as ortho-phthalic acid, 3-nitro-phthalic acid, tetrachlorophthalic acid, mellitic acid, pyromellitic acid and trimellitic acid and anhydrides thereof.
- an antifoggant selected from the group consisting of benzotriazole, substituted benzotriazoles and aromatic polycarboxylic acid such as ortho-phthalic acid, 3-nitro-phthalic acid, tetrachlorophthalic acid, mellitic acid, pyromellitic acid and trimellitic acid and anhydrides thereof.
- thermosensitive element further contains an optionally substituted benzotriazole.
- the thermosensitive element further contains at least one polycarboxylic acid and/or anhydride thereof in a molar percentage of at least 15 with respect to all the organic silver salt(s) present and in thermal working relationship therewith.
- the polycarboxylic acid may be aliphatic (saturated as well as unsaturated aliphatic and also cycloaliphatic) or an aromatic polycarboxylic acid, may be substituted and may be used in anhydride form or partially esterified on the condition that at least two free carboxylic acids remain or are available in the heat recording step.
- the substantially light-insensitive thermographic material used in the present invention may contain one or more surfactants, which may be anionic, non-ionic or cationic surfactants and/or one or more dispersants.
- Suitable dispersants are natural polymeric substances, synthetic polymeric substances and finely divided powders, e.g. finely divided non-metallic inorganic powders such as silica.
- the support is transparent or translucent. It is preferably a thin flexible carrier made transparent resin film, e.g. made of a cellulose ester, e.g. cellulose triacetate, polypropylene, polycarbonate or polyester, e.g. polyethylene terephthalate.
- the support may be in sheet, ribbon or web form and subbed if needs be to improve the adherence to the thereon coated thermosensitive element.
- the support may be dyed or pigmented to provide a transparent coloured background for the image.
- the thermosensitive element is provided with a protective layer.
- a protective layer In general this protects the thermosensitive element from atmospheric humidity and from surface damage by scratching etc. and prevents direct contact of printheads or heat sources with the recording layers.
- Protective layers for thermosensitive elements which come into contact with and have to be transported past a heat source under pressure, have to exhibit resistance to local deformation and good slipping characteristics during transport past the heat source during heating.
- a slipping layer being the outermost layer, may comprise a dissolved lubricating material and/or particulate material, e.g. talc particles, optionally protruding from the outermost layer. Examples of suitable lubricating materials are a surface active agent, a liquid lubricant, a solid lubricant or mixtures thereof, with or without a polymeric binder.
- any layer of the substantially light-insensitive thermographic material used in the present invention may proceed by any coating technique e.g. such as described in Modern Coating and Drying Technology, edited by Edward D. Cohen and Edgar B. Gutoff, (1992) VCH Publishers Inc., 220 East 23rd Street, Suite 909 New York, NY 10010, USA. Coating may proceed from aqueous or solvent media with overcoating of dried, partially dried or undried layers.
- Thermographic imaging is carried out by the image-wise application of heat either in analogue fashion by direct exposure through an image or by reflection from an image, or in digital fashion pixel by pixel either by using an infra-red heat source, for example with a Nd-YAG laser or other infra-red laser, with a substantially light-insensitive thermographic material preferably containing an infra-red absorbing compound, or by direct thermal imaging with a thermal head.
- thermal printing image signals are converted into electric pulses and then through a driver circuit selectively transferred to a thermal printhead.
- the thermal printhead consists of microscopic heat resistor elements, which convert the electrical energy into heat via Joule effect.
- the operating temperature of common thermal printheads is in the range of 300 to 400°C and the heating time per picture element (pixel) may be less than 1.0ms, the pressure contact of the thermal printhead with the recording material being e.g. 200-1000g/linear cm, i.e. with a contact zone (nip) of 200 to 300 ⁇ m a pressure of 5000 to 50,000 g/cm 2 , to ensure a good transfer of heat.
- the image-wise heating of the recording material with the thermal printing heads may proceed through a contacting but removable resin sheet or web wherefrom during the heating no transfer of recording material can take place.
- Activation of the heating elements can be power-modulated or pulse-length modulated at constant power.
- EP-A 654 355 discloses a method for making an image by image-wise heating by means of a thermal head having energizable heating elements, wherein the activation of the heating elements is executed duty cycled pulsewise.
- EP-A 622 217 discloses a method for making an image using a direct thermal imaging element producing improvements in continuous tone reproduction.
- Image-wise heating of the recording material can also be carried out using an electrically resistive ribbon incorporated into the material.
- Image- or pattern-wise heating of the recording material may also proceed by means of pixel-wise modulated ultrasound.
- Thermographic imaging can be used for the production of reflection type prints and transparencies, in particular for use in the medical diagnostic field in which black-imaged transparencies are widely used in inspection techniques operating with a light box.
- Subbing layer Nr. 01 has the composition: copolymer of 88% vinylidene chloride, 10% methyl acrylate and 2% itaconic acid 79.1 mg/m 2 Kieselsol® 100F, a colloidal silica from BAYER 18.6 mg/m 2 Mersolat® H, a surfactant from BAYER 0.4 mg/m 2 Ultravon® W, a surfactant from CIBA-GEIGY 1.9 mg/m 2 Subbing layer Nr.
- 02 has the composition: copolymer of 88% vinylidene chloride, 10% methyl acrylate and 2% itaconic acid 151 mg/m 2 Kieselsol® 100F, a colloidal silica from BAYER 35 mg/m 2 Mersolat® H, a surfactant from BAYER 0.75 mg/m 2
- thermosensitive element Ingredients in the thermosensitive element in addition to the above-mentioned ingredients:
- thermographic materials of COMPARATIVE EXAMPLES 1 to 3 were prepared by coating a dispersion with the following ingredients in 2-butanone onto a 175 ⁇ m thick blue-pigmented polyethylene terephthalate support with CIELAB a*- and b*- values of -9.5 and -17.9 respectively subbed on the emulsion-coated side with subbing layer 01 giving layers after drying at 50°C for 1h in a drying cupboard with the compositions given in Table 1.
- thermosensitive elements were then coated with an aqueous composition with the following ingredients, which was adjusted to a pH of 3.8 with 1N nitric acid, to a wet layer thickness of 85 ⁇ m and then dried at 50°C for 15 minutes to produce a protective layer PRO-L with the composition:
- the protective layer was hardened by heating the substantially light-insensitive thermographic material at 45°C for 7 days at a relative humidity of 70%.
- thermographic recording materials of COMPARATIVE EXAMPLES 1 to 3 were printed using a DRYSTARTM 4500 printer from AGFA-GEVAERT with a resolution of 508 dpi which had been modified to operate at a printing speed of 14 mm/s and a line-time of 3.5 ms instead of 7.1 ms and in which the 75 ⁇ m long (in the transport direction) and 50 ⁇ m wide thermal head resistors were power-modulated to produce different image densities.
- the maximum densities of the images (D max ) measured through a visible filter with a MACBETHTM TR924 densitometer were all greater than 2.2.
- the stainless steel light-box used was 650mm long, 600mm wide and 120mm high with an opening 610mm long and 560mm wide with a rim 10mm wide and 5mm deep round the opening, thereby forming a platform for a 5mm thick plate of white PVC 630mm long and 580mm wide, making the white PVC-plate flush with the top of the light-box and preventing light loss from the light-box other than through the white PVC-plate.
- This light-box was fitted with 9 Planilux?
- TLD 36W/54 fluorescent lamps 27mm in diameter mounted length-wise equidistantly from the two sides, with the lamps positioned equidistantly to one another and the sides over the whole width of the light-box and with the tops of the fluorescent tubes 30mm below the bottom of the white PVC plate and 35mm below the materials being tested.
- the shifts in CIELAB a*- and b*-values at an optical density, D, of 1.0 and the shift in the CIELAB b*-value were determined for COMPARATIVE EXAMPLES 1 to 3 and the results are also given in Table 2. Comparative Example nr.
- thermographic materials of COMPARATIVE EXAMPLES 4 to 7 and INVENTION EXAMPLES 1 to 2 were prepared by coating a dispersion with the following ingredients in 2-butanone onto the support described for COMPARATIVE EXAMPLES 1 to 3 giving layers after drying at 85°C for 3 minutes in a drying cupboard with the compositions given in Table 3.
- thermographic properties of the substantially light-insensitive thermographic recording materials of COMPARATIVE EXAMPLES 4 to 7 and INVENTION EXAMPLES 1 to 2 were evaluated as described for COMPARATIVE EXAMPLES 1 to 3. The results are given in Table 4. Comparative Example nr.
- thermographic recording materials of INVENTION EXAMPLES 1 and 2 containing MTA-1 and Compound 2 respectively, according to the present invention No prohibitive imaging characteristics were found for the thermographic recording materials of INVENTION EXAMPLES 1 and 2 containing MTA-1 and Compound 2 respectively, according to the present invention.
- thermographic materials of INVENTION EXAMPLES 3 and 4 in which S03, benzotriazole, was used in the thermosensitive element in combination with various 1-(5-mercapto-tetrazolyl)-acetyl stabilizers were prepared by coating a dispersion with the following ingredients in 2-butanone onto a 175 ⁇ m thick blue-pigmented polyethylene terephthalate support with CIELAB a*- and b*- values of -9.5 and -17.9 respectively subbed on the emulsion-coated side with subbing layer 02 giving layers after drying at 50°C for 1h in a drying cupboard with the compositions given in Table 6.
- thermosensitive elements were then provided with a protective layer as described for COMPARATIVE EXAMPLES 1 to 3.
- invention stabilizer AgBeh coverage [g/m 2 ] BL5HP [g/m 2 ] R01 mol% vs AgB R02 mol% vs AgB T02 mol% vs AgB S01 mol% vs AgB S02 mol% vs AgB S03 mol% vs AgB VL [g/m 2 ] Oil [g/m 2 ] type mol% vs AgB 3 MTA-1 3 3.94 15.52 35 45 15 27 5 3 0.175 0.033 4 Comp. 1 1.5 3.94 15.52 35 45 15 27 5 3 0.175 0.033
- thermographic properties of the substantially light-insensitive thermographic recording materials of INVENTION EXAMPLES 3 and 4 were evaluated as described above for COMPARATIVE EXAMPLES 1 to 3. The results are given in Table 7.
- thermographic materials of COMPARATIVE EXAMPLES 8 and 9 and INVENTION EXAMPLES 5 to 8 were prepared by coating a dispersion with the following ingredients in 2-butanone onto the support as described for COMPARATIVE EXAMPLES 1 to 3 giving layers after drying at 85°C for 3 minutes in a drying cupboard with the compositions given in Table 8. Comparative example nr.
- thermosensitive elements were then provided with a protective layer as described for COMPARATIVE EXAMPLES 1 to 3.
- thermographic properties of the substantially light-insensitive thermographic recording materials of COMPARATIVE EXAMPLES 8 and 9 and INVENTION EXAMPLES 5 to 8 were evaluated as described for COMPARATIVE EXAMPLES 1 to 3. The results are given in Table 9. Invention Example nr.
- the substantially light-insensitive recording materials of INVENTION EXAMPLES 5 to 8 containing the stabilizers Compound 3 to Compound 6 exhibited improved light box stability i.e. reduced shifts in CIELAB-values compared with the substantially light-insensitive recording materials of COMPARATIVE EXAMPLES 8 and 9, without a stabilizer and with benzotriazole respectively, particularly with respect to lower shifts in the CIELAB b*-value for Dmin.
- the substantially light-insensitive recording materials of INVENTION EXAMPLES 5 to 8 containing the stabilizers Compound 3 to Compound 6 clearly exhibit improved overall stabilizing properties compared with the substantially light-insensitive recording materials of COMPARATIVE EXAMPLES 8 and 9, without a stabilizer and with benzotriazole respectively.
- the present invention may include any feature or combination of features disclosed herein either implicitly or explicitly or any generalisation thereof irrespective of whether it relates to the presently claimed invention.
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US4201582A (en) * | 1974-05-02 | 1980-05-06 | Eastman Kodak Company | Photothermographic and thermographic element, composition and process |
US5686228A (en) * | 1996-07-25 | 1997-11-11 | Imation Corp. | Substituted propenitrile compounds as antifoggants for black-and-white photothermographic and thermographic elements |
EP0838722A2 (de) * | 1996-10-22 | 1998-04-29 | Fuji Photo Film Co., Ltd. | Photothermographisches Material, neues 2,3-Dihydrothiazol-Derivat und photographisches, lichtempfindliches Silberhalogenid-Material |
EP0897130A1 (de) * | 1997-08-11 | 1999-02-17 | Fuji Photo Film Co., Ltd. | Thermographisches Aufzeichnungsmaterial |
US5922529A (en) * | 1996-12-26 | 1999-07-13 | Fuji Photo Film Co., Ltd. | Photothermographic material |
EP1079269A1 (de) * | 1999-08-20 | 2001-02-28 | Konica Corporation | Silberhalogenidemulsion und photographisches lichtempfindliches Silberhalogenidmaterial |
EP1164421A1 (de) * | 2000-06-13 | 2001-12-19 | Eastman Kodak Company | Photothermographisches Bildaufzeichnungselement mit verbessertem Kontrast und Verfahren zur Bildentwicklung |
WO2001096944A2 (en) * | 2000-06-13 | 2001-12-20 | Eastman Kodak Company | Color photothermographic elements comprising phenolic thermal solvents |
-
2003
- 2003-10-30 EP EP03104030A patent/EP1420293B1/de not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US4201582A (en) * | 1974-05-02 | 1980-05-06 | Eastman Kodak Company | Photothermographic and thermographic element, composition and process |
US5686228A (en) * | 1996-07-25 | 1997-11-11 | Imation Corp. | Substituted propenitrile compounds as antifoggants for black-and-white photothermographic and thermographic elements |
EP0838722A2 (de) * | 1996-10-22 | 1998-04-29 | Fuji Photo Film Co., Ltd. | Photothermographisches Material, neues 2,3-Dihydrothiazol-Derivat und photographisches, lichtempfindliches Silberhalogenid-Material |
US5922529A (en) * | 1996-12-26 | 1999-07-13 | Fuji Photo Film Co., Ltd. | Photothermographic material |
EP0897130A1 (de) * | 1997-08-11 | 1999-02-17 | Fuji Photo Film Co., Ltd. | Thermographisches Aufzeichnungsmaterial |
EP1079269A1 (de) * | 1999-08-20 | 2001-02-28 | Konica Corporation | Silberhalogenidemulsion und photographisches lichtempfindliches Silberhalogenidmaterial |
EP1164421A1 (de) * | 2000-06-13 | 2001-12-19 | Eastman Kodak Company | Photothermographisches Bildaufzeichnungselement mit verbessertem Kontrast und Verfahren zur Bildentwicklung |
WO2001096944A2 (en) * | 2000-06-13 | 2001-12-20 | Eastman Kodak Company | Color photothermographic elements comprising phenolic thermal solvents |
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