EP1006403A1 - Use of direct thermal transparent imaging materials including an organic silver salt for producing labels - Google Patents
Use of direct thermal transparent imaging materials including an organic silver salt for producing labels Download PDFInfo
- Publication number
- EP1006403A1 EP1006403A1 EP99204001A EP99204001A EP1006403A1 EP 1006403 A1 EP1006403 A1 EP 1006403A1 EP 99204001 A EP99204001 A EP 99204001A EP 99204001 A EP99204001 A EP 99204001A EP 1006403 A1 EP1006403 A1 EP 1006403A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- imaging material
- silver salt
- material according
- organic silver
- thermosensitive element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000463 material Substances 0.000 title claims abstract description 84
- 238000003384 imaging method Methods 0.000 title claims abstract description 35
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 238000001931 thermography Methods 0.000 claims abstract description 32
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 239000002243 precursor Substances 0.000 claims abstract description 9
- 125000003118 aryl group Chemical group 0.000 claims abstract description 8
- 239000001003 triarylmethane dye Substances 0.000 claims abstract description 7
- FAYOCELKCDKZCA-UHFFFAOYSA-N 5-hydroxy-2,4-dimethylthiophen-3-one Chemical compound CC1SC(O)=C(C)C1=O FAYOCELKCDKZCA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 150000003568 thioethers Chemical group 0.000 claims abstract description 6
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 44
- 239000011241 protective layer Substances 0.000 claims description 9
- -1 3,4-dihydroxyphenyl compound Chemical class 0.000 claims description 8
- YQUVCSBJEUQKSH-UHFFFAOYSA-N 3,4-dihydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C(O)=C1 YQUVCSBJEUQKSH-UHFFFAOYSA-N 0.000 claims description 4
- KBPUBCVJHFXPOC-UHFFFAOYSA-N ethyl 3,4-dihydroxybenzoate Chemical compound CCOC(=O)C1=CC=C(O)C(O)=C1 KBPUBCVJHFXPOC-UHFFFAOYSA-N 0.000 claims description 4
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- CBDBLXUJRXZQMK-UHFFFAOYSA-N butyl 3,4-dihydroxybenzoate Chemical compound CCCCOC(=O)C1=CC=C(O)C(O)=C1 CBDBLXUJRXZQMK-UHFFFAOYSA-N 0.000 claims description 2
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical class OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims description 2
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- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 2
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- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 description 2
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- 125000000623 heterocyclic group Chemical group 0.000 description 2
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 2
- PHTQWCKDNZKARW-UHFFFAOYSA-N isoamylol Chemical compound CC(C)CCO PHTQWCKDNZKARW-UHFFFAOYSA-N 0.000 description 2
- 150000007517 lewis acids Chemical class 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- FBSFWRHWHYMIOG-UHFFFAOYSA-N methyl 3,4,5-trihydroxybenzoate Chemical compound COC(=O)C1=CC(O)=C(O)C(O)=C1 FBSFWRHWHYMIOG-UHFFFAOYSA-N 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
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- UXTZUUVTGMDXNG-UHFFFAOYSA-N 1,2-benzoxazine-3,4-dione Chemical compound C1=CC=C2C(=O)C(=O)NOC2=C1 UXTZUUVTGMDXNG-UHFFFAOYSA-N 0.000 description 1
- XBYRMPXUBGMOJC-UHFFFAOYSA-N 1,2-dihydropyrazol-3-one Chemical class OC=1C=CNN=1 XBYRMPXUBGMOJC-UHFFFAOYSA-N 0.000 description 1
- UHKAJLSKXBADFT-UHFFFAOYSA-N 1,3-indandione Chemical class C1=CC=C2C(=O)CC(=O)C2=C1 UHKAJLSKXBADFT-UHFFFAOYSA-N 0.000 description 1
- LHENQXAPVKABON-UHFFFAOYSA-N 1-methoxypropan-1-ol Chemical compound CCC(O)OC LHENQXAPVKABON-UHFFFAOYSA-N 0.000 description 1
- CDAWCLOXVUBKRW-UHFFFAOYSA-N 2-aminophenol Chemical class NC1=CC=CC=C1O CDAWCLOXVUBKRW-UHFFFAOYSA-N 0.000 description 1
- UYMBCDOGDVGEFA-UHFFFAOYSA-N 3-(1h-indol-2-yl)-3h-2-benzofuran-1-one Chemical compound C12=CC=CC=C2C(=O)OC1C1=CC2=CC=CC=C2N1 UYMBCDOGDVGEFA-UHFFFAOYSA-N 0.000 description 1
- BOTGCZBEERTTDQ-UHFFFAOYSA-N 4-Methoxy-1-naphthol Chemical compound C1=CC=C2C(OC)=CC=C(O)C2=C1 BOTGCZBEERTTDQ-UHFFFAOYSA-N 0.000 description 1
- GJCOSYZMQJWQCA-UHFFFAOYSA-N 9H-xanthene Chemical compound C1=CC=C2CC3=CC=CC=C3OC2=C1 GJCOSYZMQJWQCA-UHFFFAOYSA-N 0.000 description 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 1
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Natural products OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 1
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- 229920000084 Gum arabic Polymers 0.000 description 1
- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 229920002845 Poly(methacrylic acid) Polymers 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
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- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
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- 125000004429 atom Chemical group 0.000 description 1
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- CCGGDOVGIDSGQN-UHFFFAOYSA-N benzo[f][1,2]benzoxazine-1,2-dione Chemical compound C1=CC=CC2=C(C(C(=O)NO3)=O)C3=CC=C21 CCGGDOVGIDSGQN-UHFFFAOYSA-N 0.000 description 1
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- CZZYITDELCSZES-UHFFFAOYSA-N diphenylmethane Chemical compound C=1C=CC=CC=1CC1=CC=CC=C1 CZZYITDELCSZES-UHFFFAOYSA-N 0.000 description 1
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- QDLAGTHXVHQKRE-UHFFFAOYSA-N lichenxanthone Natural products COC1=CC(O)=C2C(=O)C3=C(C)C=C(OC)C=C3OC2=C1 QDLAGTHXVHQKRE-UHFFFAOYSA-N 0.000 description 1
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- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- AQRYNYUOKMNDDV-UHFFFAOYSA-M silver behenate Chemical compound [Ag+].CCCCCCCCCCCCCCCCCCCCCC([O-])=O AQRYNYUOKMNDDV-UHFFFAOYSA-M 0.000 description 1
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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
Definitions
- the present invention concerns the use of substantially light-insensitive monosheet direct thermal imaging materials for producing labels.
- Thermal imaging or thermography is a recording process wherein images are generated by the use of thermal energy.
- a visible image pattern is produced by image-wise heating of a recording material e.g. image signals can be converted into electric pulses and then via a driver circuit selectively transferred to a thermal printhead, which consists of microscopic heat resistor elements, thereby converting the electrical energy into heat via the Joule effect. This heat brings about image formation in the thermographic material.
- Label-printing by means of thermography is known with tapes on the basis of monosheet materials such as colourless or light coloured dye precursor leuco-dye systems, as disclosed in US-P 4,370,370, EP-A 479 578 and EP-A 754 564, diazo systems, as disclosed in JP 60-01077A, or two-sheet thermal dye transfer systems, such as disclosed in EP-A 656 264 and US-P 4,943,555.
- monosheet materials such as colourless or light coloured dye precursor leuco-dye systems, as disclosed in US-P 4,370,370, EP-A 479 578 and EP-A 754 564, diazo systems, as disclosed in JP 60-01077A, or two-sheet thermal dye transfer systems, such as disclosed in EP-A 656 264 and US-P 4,943,555.
- WO 87/03541A discloses a recording material which comprises (a) at least one di- or triarylmethane dye precursor compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with an S-containing moiety ring-closed on the meso carbon atom selected from a thiolactone, dithiolactone and thioether moiety and (b) a Lewis acid material capable of opening said S-containing moiety whereby said compound is rendered colourless, which Lewis acid material can be an organic silver salt.
- US 5,750,464 and US 5,411,929A disclose refinements of the concept of WO 87/03541A in which the organic silver salt opens the S-containing moiety rendering said compound containing the S-containing moiety colourless.
- US-P 3,708,378 provides a single integral imaging sheet that in a single rapid operation may be converted to a label carrying the desired retro-reflective informative symbols. It discloses a light-stable heat-sensitive imaging sheet on which retro-reflective images may be rapidly defined comprising (1) a support layer, (2) a uniform continuous monolayer of retro-reflective elements disposed on one side of the support layer, and (3) an imaging layer disposed over the retro-reflective elements comprising, in uniform distribution throughout the layer, a light-stable heat-sensitive material that is rapidly chemically modified as to its light-transmitting properties by exposure to heat, the imaging layer being selected from the group consisting of (1) normally transparent light-stable layers that are adapted to be converted to transparent when exposed to heat and (2) normally opaque light-stable layers that are adapted to be converted to transparent when exposed to heat, whereby light beamed against the sheet will be retro-reflected only by retro-reflective elements exposed through the transparent areas. Examples 1 and 2 both disclose a silver behenate-based imaging layer using
- thermographic materials produced with monosheet thermographic materials based on leuco-dyes have a well-known propensity to fade when exposed to light
- thermographic materials disclosed in US 5,750,464, US 5,411,929A and WO 87/03541A concern colour removal rather than colour formation, and thermal dye transfer systems are expensive to assemble and produce waste due to the disposal of the donor lint resulting in ecological objections.
- thermosensitive element contains a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith, a binder and does not contain a di-or triarylmethane dye precursor compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with an S-containing moiety ring-closed on the meso carbon atom selected from a thiolactone, dithiolactone and thioether moiety.
- a label according to the present invention is a non-retro-reflective readable object attachable to a second object for information purposes.
- a direct thermal imaging material is a material in which coloration is obtained in areas of the material to which heat is supplied either directly by an external heat source or indirectly by heat produced upon absorption of infra-red radiation in these areas of the material.
- Transparent means capable of transmitting visible light without appreciable scattering.
- substantially light-insensitive is meant not intentionally light sensitive.
- aqueous in the term aqueous medium includes mixtures of water-miscible organic solvents such as alcohols e.g. methanol, ethanol, 2-propanol, butanol, iso-amyl alcohol etc.; glycols e.g. ethylene glycol; glycerine; N-methyl pyrrolidone; methoxypropanol; and ketones e.g. 2-propanone and 2-butanone etc. with water in which water constitutes more than 50% by weight of the aqueous medium with 65% by weight of the aqueous medium being preferred and 80% by weight of the aqueous being particularly preferred.
- alcohols e.g. methanol, ethanol, 2-propanol, butanol, iso-amyl alcohol etc.
- glycols e.g. ethylene glycol
- glycerine N-methyl pyrrolidone
- methoxypropanol methoxypropanol
- ketones e
- the encapsulated organic silver salt in a heat-responsive microcapsule disclosed in EP 736 799A whose use in the thermosensitive element of the present invention is preferably excluded has a wall which isolates the substances incorporated therein from the exterior at room temperature, but becomes permeable without being destroyed when pressure is applied or when heated.
- the microcapsule can be prepared by any of interfacial polymerization, internal polymerization and external polymerization. Interfacial polymerization comprises emulsifying a core substance comprising an organic silver salt that has been dissolved or dispersed in an organic solvent in an aqueous solution having a water-soluble polymer therein and then forming a polymer wall around the emulsified oil droplets of the core substance.
- a leuco-dye is a colourless or weakly coloured compound derived from a dye.
- Colourless or light coloured dye precursor leuco-dye systems whose use in the thermosensitive element of the present invention is excluded include leuco triarylmethane, indolyl phthalide, diphenylmethane, 2-anilinofluoran, 7-anilinofluoran, xanthene and spiro compounds such as disclosed in EP-A 754 564.
- heat solvent in this invention is meant a non-hydrolyzable organic material which is in a solid state in the recording layer at temperatures below 50°C, but becomes a plasticizer for the recording layer when thermally heated and/or a liquid solvent for the organic silver salt or the reducing agent.
- the image density did not vary systematically with the heating energy applied to the adjacent heating element during the thermographic development process, the so-called dot energy, the image density achieved with a substantially light-insensitive monosheet direct thermal imaging material based on an organic silver salt appears surprisingly mainly to depend upon the heating energy applied to the adjacent heating element during the thermographic development process. Since dot energy is the product of heating power and heating pulse-length, this implies that the image density is surprisingly almost independent of the heating power. Moreover, the heating power will largely determine the temperature attained by the heating element and hence that attained by the substantially light-insensitive monosheet direct thermal imaging material based on an organic silver salt in proximity to the heating element during the thermal development process.
- the image density is almost independent of the temperature attained by the substantially light-insensitive monosheet direct thermal imaging material based on an organic silver salt in proximity to the heating element during the thermal development process.
- this dot energy can be supplied to one or more heating elements activated to produce the dot with a particular image density i.e. the heating power (i.e. drive voltage squared divided by the heating element resistance) applied to the one or more heating elements, in one or more heat pulses and the duration of the one or more pulses.
- INVENTION EXAMPLES 1 to 11 show that the image density increases with increasing dot energy up to a maximum image density.
- the dot energy corresponding to this maximum image density has been found to be dependent upon the choice of reducing agent for a particular organic silver salt, the choice of toning agent and the ratio of binder to organic silver salt in the thermosensitive element. At still higher energies the image density decreases with further increase in dot energy.
- the image density potential of the material has been found mainly to depend upon the weight per unit area of substantially light-insensitive organic silver salt therein.
- the substantially light-insensitive monosheet direct thermal imaging materials of the present invention includes a support, a thermosensitive element and an attaching layer and in a preferred embodiment further includes a dyed or a pigmented transparent layer to provide a coloured background for the image on the label.
- the dyed or the pigmented transparent layer is preferably provided on the support.
- the substantially light-insensitive monosheet direct thermal imaging material of the present invention are preferably transparent.
- the attaching layer is, once an optional protective foil has been removed, the outermost layer on the same side of the support as the thermosensitive element or the outermost layer on the side of the support not provided with the thermosensitive element.
- This attaching layer provides adhesion upon contact with the surface of an object to which it is to be attached under the conditions of attachment.
- This object is a solid whose surface may, for example, be plastic, paper, metal, wood, glass, ceramic etc.
- adhesion is a co-operative effect between the attaching layer and the surface of the object to which it is attached and is influenced by the conditions of attachment. Therefore the choice of attaching layer is dependent upon the surface of the object to which it is to be attached, i.e.
- This attaching layer may, for example, be a single or multi-component, cold, hot-melt or pressure resinous adhesive.
- the protective foil may, for example, be plastic, metallic or a glassine-based paper coated e.g. with a silicone layer.
- the substantially light-insensitive monosheet direct thermal imaging material used in the present invention comprises a thermosensitive element.
- the thermosensitive element contains a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith a binder and does not contain a di-or triarylmethane dye precursor compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with an S-containing moiety ring-closed on the meso carbon atom selected from a thiolactone, dithiolactone and thioether moiety.
- thermosensitive element preferably excludes colourless or light coloured dye precursor leuco-dye systems and also preferably excludes
- thermosensitive element may also comprise a layer system in which the ingredients may be dispersed in different layers, with the proviso that the substantially light-insensitive organic silver salt and the reducing agent are in thermal working relationship with one another 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 substantially light-insensitive organic silver salt particles so that reduction of the substantially light-insensitive organic silver salt can take place.
- Preferred substantially light-insensitive organic silver salts for use in the thermosensitive element of the substantially light-insensitive monosheet direct thermal imaging material used in the present invention are silver salts of aliphatic carboxylic acids known as fatty acids, wherein the aliphatic carbon chain has preferably at least 12 C-atoms, which silver salts are also called "silver soaps". Combinations of different organic silver salts may also be used in the imaging materials of the present invention.
- Suitable organic reducing agents for the reduction of the substantially light-insensitive organic silver salts are organic compounds containing at least one active hydrogen atom linked to O, N or C, such as is the case with: catechol; hydroquinone; aminophenols; METOLTM; p-phenylenediamines; alkoxynaphthols, e.g. 4-methoxy-1-naphthol described in US-P 3,094,417; pyrolidin-3-one type reducing agents, e.g.
- PHENIDONETM pyrazolin-5-ones; indan-1,3-dione derivatives; hydroxytetrone acids; hydroxytetronimides; hydroxylamine derivatives such as for example described in US-P 4,082,901; hydrazine derivatives; and reductones e.g. ascorbic acid; see also US-P 3,074,809, 3,080,254, 3,094,417 and 3,887,378.
- thermosensitive element contains a 3,4-dihydroxyphenyl compound in which a benzene ring substituted with any group in the 1-position is further substituted with hydroxy-groups in the 3- and 4-positions, the 3,4-dihydroxyphenyl compound being preferably selected from the group consisting of gallic acid derivatives, gallates, ethyl 3,4-dihydroxybenzoate, butyl 3,4-dihydroxybenzoate, 3,4-dihydroxy-benzoic acid and 3,4-dihydroxybenzonitrile.
- the thermosensitive element further contains a second reducing agent.
- thermosensitive element of the direct thermal transparent imaging material used in the present invention may be coated onto a support in sheet- or web-form from an organic solvent containing the binder dissolved therein or may be applied from an aqueous medium using water-soluble or water-dispersible binders.
- Suitable binders for coating from an organic solvent are all kinds of natural, modified natural or synthetic resins or mixtures of such resins, wherein the organic heavy metal salt can be dispersed homogeneously or mixtures thereof.
- Suitable water-soluble film-forming binders are: polyvinyl alcohol, polyacrylamide, polymethacrylamide, polyacrylic acid, polymethacrylic acid, polyethyleneglycol, polyvinylpyrrolidone, proteinaceous binders such as gelatin modified gelatins such as phthaloyl gelatin, polysaccharides, such as starch, gum arabic and dextrin and water-soluble cellulose derivatives.
- Suitable water-dispersible binders are any water-insoluble polymer.
- Binder to organic silver salt weight ratios decreases the gradation of the image increasing. Binder to organic silver salt weight ratios of 0.2 to 6 are preferred with weight ratios between 0.5 and 3 being particularly preferred.
- binders or mixtures thereof may be used in conjunction with waxes or "heat solvents" to improve the reaction speed of the organic silver salt reduction at elevated temperatures.
- the direct thermal transparent imaging material used in the present invention may contain one or more toning agents.
- the toning agents should be in thermal working relationship with the substantially light-insensitive organic silver salt and reducing agents during thermal processing. Any known toning agent from thermography or photothermography may be used. Suitable toning agents are the phthalimides and phthalazinones within the scope of the general formulae described in US-P 4,082,901 and the toning agents described in US-P 3,074,809, US-P 3,446,648 and US-P 3,844,797.
- Particularly useful toning agents are the heterocyclic toner compounds of the benzoxazine dione or naphthoxazine dione type described in GB-P 1,439,478, US-P 3,951,660 and US-P 5,599,647.
- stabilizers and antifoggants may be incorporated into the substantially light-insensitive monosheet direct thermal imaging material used in the present invention.
- Suitable stabilizers compounds for use in the substantially light-insensitive monosheet direct thermal imaging material used in the present invention are represented by general formula I : where Q are the necessary atoms to form a 5- or 6-membered aromatic heterocyclic ring, A is selected from hydrogen, a counterion to compensate the negative charge of the thiolate group or a group forming a symmetrical or an asymmetrical disulfide.
- the substantially light-insensitive monosheet direct thermal imaging 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 direct thermal transparent imaging material may contain other additives such as free fatty acids, antistatic agents, e.g. non-ionic antistatic agents including a fluorocarbon group as e.g. in F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H, silicone oil, ultraviolet light absorbing compounds, white light reflecting and/or ultraviolet radiation reflecting pigments, silica, and/or optical brightening agents.
- antistatic agents e.g. non-ionic antistatic agents including a fluorocarbon group as e.g. in F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H
- silicone oil e.g. in F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H
- ultraviolet light absorbing compounds e.g. in F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H
- silicone oil e.g. in F 3 C(CF 2 ) 6 CONH(CH 2 CH 2 O)-H
- the support of the direct thermal transparent imaging material used in the present invention is transparent and 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.
- thermosensitive element In a preferred embodiment of the present invention a protective layer is provided for the thermosensitive element. 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 mainsheet direct thermal transparent imaging material used in the present invention may proceed by any known 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.
- Direct thermal imaging is carried out by the image-wise application of heat either in analogue fashion by direct exposure through an image of 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, or by direct thermal imaging with a thermal head.
- an infra-red heat source for example with a Nd-YAG laser or other infra-red laser
- 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 electric pulses thus converted into thermal signals manifest themselves as heat transferred to the surface of the thermal paper wherein the chemical reaction resulting in colour development takes place.
- Such thermal printing heads may be used in contact or close proximity with the recording layer.
- 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. 200-500g/cm 2 to ensure a good transfer of heat.
- the image-wise heating of the recording layer 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.
- the image signals for modulating the laser beam or current in the micro-resistors of a thermal printhead are obtained directly or from an intermediary storage means, optionally linked to a digital image work station wherein the image information can be processed to satisfy particular needs.
- Activation of the heating elements can be power-modulated or pulse-length modulated at constant power.
- EP-A 654 355 describes 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. When used in thermographic recording operating with thermal printheads the imaging materials are not suitable for reproducing images with fairly large number of grey levels as is required for continuous tone reproduction.
- 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 thermographic material can also be carried out using an electrically resistive ribbon incorporated into the material. Image- or pattern-wise heating of the thermographic material may also proceed by means of pixel-wise modulated ultra-sound.
- the label-printing apparatus used for these experiments was a thermal head printer, the thermal head having a nominal resistance of 102.6 ohms and 115 ⁇ m by 142 ⁇ m heating elements. It printed with a line time of 11.5ms at a process speed of 7.3mm/s, was powered by six 1.5 volt batteries and had a DC-motor driven drum transport.
- BROTHER P-TOUCH TYPETM M-K231 black on white leuco-dye-based direct thermal imaging material with an opaque white backing layer was printed with three heating pulses evenly distributed over the line time at the voltages and pulse times given in table 1.
- the image density D vis and the CIELAB L*, a* and b* values determined in refection according to ASTM Norm E308 of the resulting prints are given in table 1 below.
- the lightfastness of a print produced with the BROTHER P-TOUCH TYPETM M-K231 leuco dye-based direct thermal imaging material was evaluated according to DIN 54 024 of August 1983 for the determination of lightfastness of colourings and prints, which is equivalent to the ISO-document 38/l N 767, pages 59-73, with an Atlas Material Testing Technology By, D-63558 Gelnhausen, Germany, SUNTESTTM CPS apparatus.
- the print is exposed to artificial sunlight through a glass filter together with standardized pigmented cloth samples and exposed to different doses of artificial sunlight as determined by the fading of the standardized pigmented cloth samples and expressed as numbers on the International Wool-scale.
- thermosensitive element Preparation of the thermosensitive element
- thermosensitive element with the composition:
- thermosensitive element Overcoating of thermosensitive element with a protective layer
- thermosensitive element was overcoated with a protective layer with the composition: PIOLOFORMTM LL4160, a polyvinyl butyral from WACKER CHEMIE 1.539 g/m 2 BAYSILONTM MA, a silicone oil from BAYER 0.006 g/m 2 MICRODOLTM SUPER, a talc from Norwegian Talc AS 0.052 g/m 2 TINUVINTM 320 from CIBA-GEIGY 0.229 g/m 2 TEGOGLIDETM 410 from Goldschmidt 0.02 g/m 2 DESMODURTM N100, a hexamethylene diisocyanate from BAYER 0.154 g/m 2
- thermographic printer used in these experiments was also a thermal head printer, but had a thermal head with a nominal resistance of 1850 ohms, had 85 ⁇ m by 85 ⁇ m heating elements, printed with a line time of 11.5ms and the thermographic material was transported at a process speed of 7.36 mm/s.
- the number of heating pulses, printhead voltages and pulse times were completely variable.
- Colour neutrality on the basis of CIELAB-values corresponds to a* and b* values of zero, with a negative a*-value indicating a greenish image-tone becoming greener as a* becomes more negative, a positive a*-value indicating a reddish image-tone becoming redder as a* becomes more positive, a negative b*-value indicating a bluish image-tone becoming bluer as b* becomes more negative and a positive b*-value indicating a yellowish image-tone becoming more yellow as b* becomes more positive.
- the direct thermal transparent imaging material used in the experiments of INVENTION EXAMPLES 12 to 33 was produced by coating the thermosensitive element overcoated with a protective layer used in INVENTION EXAMPLES 1 to 11 and coating the opposite side of the support to that coated with the thermosensitive element and its protective layer sequentially with a 5.5g/m 2 coating of a white acrylic water-based ink pigmented with titanium dioxide having an optical density of 0.38 and overcoating with a white pressure sensitive water-based dispersion to a coating weight of 26g/m 2 , the two layers together having an optical density of 0.65.
- the second layer was then pressure laminated with the silicone-coated side of 65g/m 2 glassine-based paper coated with a silicone layer, which acts as a release foil.
- the label-printing apparatus used for the printing experiments of COMPARATIVE EXAMPLES 1 to 11 was used in the printing experiments of INVENTION EXAMPLES 12 to 33 in which a direct thermal transparent imaging material produced as described above was printed with three heating pulses evenly distributed over the line time at the voltages and pulse times given in table 4.
- the image density D vis and the CIELAB L*, a* and b* values determined in refection according to ASTM Norm E308 of the resulting prints are given in table 4 below.
- L*, a* and b* were also found to be dependent upon the dot energy, L* increasing with increasing dot energy, indicating decreasing optical density, and a* and b* increasing with increasing dot energy from values in the region of zero indicating colour neutrality at lower dot energies to increasingly less neutral colour tone with increasing dot energy.
- a print produced with the organic silver salt-containing thermographic material was exposed to artificial sunlight through a glass filter in an Atlas Material Testing Technology BV, SUNTESTTM CPS apparatus according to DIN 54 004.
- the changes in the background density, D min , the maximum density, D max , and CIELAB a*-and b*-values with respect to the white background of the material expressed in terms of particular UV-light doses expressed as numbers on the International Woolscale are summarized in table 5.
- thermographic materials based upon organic silver salts have the advantages over the conventionally used leuco dye-based direct thermal imaging materials of no fading or changes in the image tone in D max and reduced D min increase and background discoloration upon exposure to artificial sunlight.
Abstract
Description
Comparative example nr | Printing conditions | Print characteristics | |||||
dot energy [mJ/mm2] | printhead voltage [V] | pulse-length [ms] | Dvis | L* | a* | b* | |
1 | 49.2 | 3.95 | 1.76 | 1.51 | 20.39 | -0.10 | -5.03 |
2 | 55.6 | 4.20 | 1.76 | 1.57 | 18.88 | 0.89 | -5.36 |
3 | 56.2 | 3.95 | 2.01 | 1.51 | 20.33 | 0.73 | -5.63 |
4 | 63.5 | 4.20 | 2.01 | 1.57 | 18.81 | 0.81 | -5.06 |
5 | 64.2 | 3.95 | 2.30 | 1.55 | 19.37 | 0.61 | -5.33 |
6 | 68.2 | 4.65 | 1.76 | 1.58 | 18.41 | 0.73 | -4.79 |
7 | 72.6 | 4.20 | 2.30 | 1.60 | 17.97 | 0.72 | -4.64 |
8 | 77.8 | 4.65 | 2.01 | 1.59 | 18.31 | 0.45 | -4.53 |
9 | 83.4 | 4.20 | 2.64 | 1.56 | 19.04 | 0.33 | -4.58 |
10 | 89.0 | 4.65 | 2.30 | 1.58 | 18.39 | 0.28 | -4.75 |
11 | 95.4 | 4.20 | 3.02 | 1.65 | 16.73 | 0.42 | -3.80 |
12 | 102.2 | 4.65 | 2.64 | 1.60 | 17.86 | 0.60 | -4.70 |
13 | 109.3 | 4.20 | 3.46 | 1.65 | 16.81 | -0.01 | -3.38 |
14 | 116.9 | 4.65 | 3.02 | 1.65 | 16.73 | 0.49 | -4.26 |
15 | 134.0 | 4.65 | 3.46 | 1.64 | 16.99 | 0.45 | -4.70 |
Dmax | a* | b* | Dmin | a* | b* | |
Image characteristics prior to sunlight exposure | 1.602 | 2.21 | -6.78 | 0.083 | -1.72 | 3.31 |
Image characteristics after an exposure of 2 according to the IWS | 1.591 | 2.04 | -7.08 | 0.087 | -1.40 | 4.35 |
Image characteristics after an exposure of 4 according to the IWS | 1.558 | 2.92 | -7.59 | 0.096 | -0.92 | 10.23 |
Image characteristics after an exposure of 5 according to the IWS | 1.040 | 18.73 | -4.33 | 0.144 | 1.00 | 24.29 |
Image characteristics after an exposure of 5+ according to the IWS | 1.116 | 16.37 | -2.06 | 0.146 | 1.06 | 24.74 |
PIOLOFORM™ LL4160, a polyvinyl butyral from WACKER CHEMIE | 1.539 g/m2 |
BAYSILON™ MA, a silicone oil from BAYER | 0.006 g/m2 |
MICRODOL™ SUPER, a talc from Norwegian Talc AS | 0.052 g/m2 |
TINUVIN™ 320 from CIBA-GEIGY | 0.229 g/m2 |
TEGOGLIDE™ 410 from Goldschmidt | 0.02 g/m2 |
DESMODUR™ N100, a hexamethylene diisocyanate from BAYER | 0.154 g/m2 |
Invention example number | Printing conditions | Print characteristics | |||||
dot energy [mJ/mm2] | printhead voltage [V] | pulse-length [ms] | Dvis | L* | a* | b* | |
1 | 37.9 | 11.5 | 3.83 | 0.01 | 99.23 | -0.04 | 0.92 |
2 | 41.7 | 11.5 | 4.21 | 0.06 | 94.84 | 0.18 | 2.37 |
3 | 45.5 | 11.5 | 4.60 | 0.22 | 81.73 | 0.62 | 6.02 |
4 | 49.3 | 11.5 | 4.98 | 0.52 | 61.90 | 0.98 | 9.34 |
5 | 53.0 | 11.5 | 5.36 | 0.90 | 41.99 | 1.70 | 11.15 |
6 | 56.9 | 11.5 | 5.75 | 1.42 | 22.89 | 2.89 | 9.70 |
7 | 60.6 | 11.5 | 6.13 | 1.79 | 13.34 | 2.90 | 4.69 |
8 | 64.4 | 11.5 | 6.51 | 1.86 | 11.79 | 1.69 | 0.33 |
9 | 68.2 | 11.5 | 6.89 | 1.98 | 9.44 | 1.13 | -1.37 |
10 | 72.0 | 11.5 | 7.28 | 1.98 | 9.43 | 0.95 | -1.35 |
11 | 75.8 | 11.5 | 7.66 | 1.89 | 11.20 | 0.76 | -2.00 |
Invention example number | Printing conditions | Print characteristics | |||||
dot energy [mJ/mm2] | printhead voltage [V] | pulse-length [ms] | Dvis | L* | a* | b* | |
12 | 63.7 | 4.20 | 1.76 | 1.93 | 10.39 | -0.04 | 3.87 |
13 | 72.3 | 4.20 | 2.01 | 2.15 | 6.34 | 0.81 | -0.98 |
14 | 77.8 | 4.65 | 1.76 | 1.97 | 9.54 | 1.70 | -0.14 |
15 | 82.7 | 4.20 | 2.30 | 1.95 | 9.98 | 1.02 | -0.62 |
16 | 88.8 | 4.65 | 2.01 | 1.77 | 13.88 | 3.45 | 1.26 |
17 | 94.9 | 4.20 | 2.64 | 1.74 | 14.46 | 2.98 | 1.27 |
18 | 97.4 | 5.20 | 1.76 | 1.65 | 16.64 | 8.89 | 5.00 |
19 | 101.7 | 4.65 | 2.30 | 1.60 | 18.00 | 6.05 | 3.53 |
20 | 109.0 | 4.20 | 3.02 | 1.64 | 16.90 | 9.95 | 7.09 |
21 | 110.8 | 5.20 | 2.01 | 1.52 | 20.17 | 10.38 | 6.89 |
22 | 116.4 | 4.65 | 2.64 | 1.49 | 20.97 | 11.56 | 7.56 |
23 | 124.9 | 4.20 | 3.46 | 1.58 | 18.52 | 16.04 | 13.45 |
24 | 127.4 | 5.20 | 2.30 | 1.50 | 20.59 | 19.18 | 14.52 |
25 | 133.5 | 4.65 | 3.02 | 1.50 | 20.71 | 18.20 | 14.52 |
26 | 136.6 | 5.20 | 2.47 | 1.41 | 23.42 | 18.00 | 12.76 |
27 | 145.7 | 5.20 | 2.64 | 1.25 | 28.30 | 17.29 | 9.70 |
28 | 153.1 | 4.65 | 3.46 | 1.36 | 24.83 | 18.14 | 12.07 |
29 | 155.5 | 5.20 | 2.82 | 1.23 | 29.00 | 20.77 | 12.14 |
30 | 167.2 | 5.20 | 3.02 | 1.13 | 32.84 | 14.02 | 9.14 |
31 | 178.2 | 5.20 | 3.23 | 1.00 | 37.69 | 13.86 | 13.27 |
32 | 191.1 | 5.20 | 3.46 | 0.95 | 39.80 | 13.06 | 11.07 |
33 | 204.5 | 5.20 | 3.70 | 0.86 | 43.94 | 11.81 | 17.49 |
Dmax | a* | b* | Dmin | a* | b* | |
Image characteristics prior to sunlight exposure | 1.805 | 12.87 | 4.42 | 0.109 | -0.90 | 9.67 |
Image characteristics after an exposure of 4 according to the IWS | 1.862 | 11.26 | 2.88 | 0.139 | -0.51 | 10.34 |
Image characteristics after an exposure of 7 according to the IWS | 1.845 | 11.92 | 2.61 | 0.167 | 0.85 | 16.26 |
Claims (9)
- Use of a substantially light-insensitive monosheet direct thermal imaging material for producing a non-retro-reflective readable object attachable to a second object for information purposes, said imaging material including a support, a thermosensitive element and an attaching layer, characterized in that said thermosensitive element contains a substantially light-insensitive organic silver salt, a reducing agent therefor in thermal working relationship therewith, a binder and does not contain a di-or triarylmethane dye precursor compound possessing within its di- or triarylmethane structure an aryl group substituted in the ortho position to the meso carbon atom with an S-containing moiety ring-closed on the meso carbon atom selected from a thiolactone, dithiolactone and thioether moiety.
- Use of an imaging material according to claim 1, wherein said attaching layer is the outermost layer, on the opposite side of said support to said thermosensitive element, once an optional protective foil has been removed.
- Use of an imaging material according to claim 1 or 2, wherein said imaging material is transparent.
- Use of an imaging material according to any of the preceding claims, wherein said imaging material further includes a dyed or a pigmented transparent layer.
- Use of an imaging material according to claim 4, wherein said support is provided with said dyed or said pigmented transparent layer.
- Use of an imaging material according to any of the preceding claims, wherein said substantially light-insensitive organic silver salt is a silver salt of an organic carboxylic acid.
- Use of an imaging material according to any of the preceding claims, wherein said reducing agent is a 3,4-dihydroxyphenyl compound.
- Use of an imaging material according to claim 7, wherein said 3,4-dihydroxyphenyl compound is selected from the group consisting of gallic acid derivatives, gallates, ethyl 3,4-dihydroxybenzoate, butyl 3,4-dihydroxybenzoate, 3,4-dihydroxy-benzoic acid and 3,4-dihydroxybenzonitrile.
- Use of an imaging material according to any of the preceding claims, wherein thermosensitive element is provided with a protective layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99204001A EP1006403B1 (en) | 1998-11-30 | 1999-11-24 | Use of direct thermal transparent imaging materials including an organic silver salt for producing labels |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98204015 | 1998-11-30 | ||
EP98204015 | 1998-11-30 | ||
EP99204001A EP1006403B1 (en) | 1998-11-30 | 1999-11-24 | Use of direct thermal transparent imaging materials including an organic silver salt for producing labels |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1006403A1 true EP1006403A1 (en) | 2000-06-07 |
EP1006403B1 EP1006403B1 (en) | 2004-10-20 |
Family
ID=26150924
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99204001A Expired - Lifetime EP1006403B1 (en) | 1998-11-30 | 1999-11-24 | Use of direct thermal transparent imaging materials including an organic silver salt for producing labels |
Country Status (1)
Country | Link |
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EP (1) | EP1006403B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7023460B2 (en) | 2002-11-13 | 2006-04-04 | Agfa Gevaert | Thermal head printer and process for printing substantially light-insensitive recording material |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987003541A2 (en) * | 1985-12-16 | 1987-06-18 | Polaroid Corporation | Novel compounds and novel recording material using the same |
US5411929A (en) * | 1994-06-30 | 1995-05-02 | Polaroid Corporation | Thermally-processable image recording materials including substituted purine compounds |
US5750464A (en) * | 1997-04-22 | 1998-05-12 | Polaroid Corporation | Thermographic recording |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR9509042A (en) * | 1994-09-27 | 1997-09-30 | Imation Corp | Thermographic image generating element and process for image formation |
GB2305509A (en) * | 1995-09-19 | 1997-04-09 | Minnesota Mining & Mfg | Heat sensitive elements |
EP0809144B1 (en) * | 1996-05-21 | 2004-04-07 | Agfa-Gevaert | Substantially non-photosensitive thermographic recording material with improved stability and image-tone |
EP0864944A1 (en) * | 1997-03-14 | 1998-09-16 | Agfa-Gevaert N.V. | Thermal processing system |
-
1999
- 1999-11-24 EP EP99204001A patent/EP1006403B1/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1987003541A2 (en) * | 1985-12-16 | 1987-06-18 | Polaroid Corporation | Novel compounds and novel recording material using the same |
US5411929A (en) * | 1994-06-30 | 1995-05-02 | Polaroid Corporation | Thermally-processable image recording materials including substituted purine compounds |
US5750464A (en) * | 1997-04-22 | 1998-05-12 | Polaroid Corporation | Thermographic recording |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7023460B2 (en) | 2002-11-13 | 2006-04-04 | Agfa Gevaert | Thermal head printer and process for printing substantially light-insensitive recording material |
Also Published As
Publication number | Publication date |
---|---|
EP1006403B1 (en) | 2004-10-20 |
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