Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
  • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
  • B41M5/323—Organic colour formers, e.g. leuco dyes
  • B41M5/327—Organic colour formers, e.g. leuco dyes with a lactone or lactam ring
  • B41M5/3275—Fluoran compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
  • B41M5/337—Additives; Binders
  • B41M5/3372—Macromolecular compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/41—Base layers supports or substrates
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
  • B41M2205/04—Direct thermal recording [DTR]
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
  • B41M2205/38—Intermediate layers; Layers between substrate and imaging layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
  • B41M2205/40—Cover layers; Layers separated from substrate by imaging layer; Protective layers; Layers applied before imaging
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
  • B41M3/10—Watermarks
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
  • B41M3/14—Security printing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
  • B41M5/333—Colour developing components therefor, e.g. acidic compounds
  • B41M5/3333—Non-macromolecular compounds
  • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
  • B41M5/333—Colour developing components therefor, e.g. acidic compounds
  • B41M5/3333—Non-macromolecular compounds
  • B41M5/3335—Compounds containing phenolic or carboxylic acid groups or metal salts thereof
  • B41M5/3336—Sulfur compounds, e.g. sulfones, sulfides, sulfonamides
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
  • B41M5/337—Additives; Binders
  • B41M5/3375—Non-macromolecular compounds
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
  • B41M5/423—Intermediate, backcoat, or covering layers characterised by non-macromolecular compounds, e.g. waxes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
  • B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes

Definitions

• the invention relates to a heat-sensitive recording material having a substrate which carries on the front side at least one heat-sensitive recording layer, which in turn has at least one dye precursor and at least one color acceptor, which react color-forming with one another under the action of heat.
• the heat-sensitive recording layer is generically covered with a protective layer.
• the thermosensitive recording material has a barrier coating capable of protecting the thermosensitive recording layer from backward penetration of chemicals capable of causing uncontrolled desensitization and color reactions in the thermosensitive recording layer.
• thermosensitive recording material is just as from EP 2 033 802 A1 according to which the recording material comprises a substrate, on the front side a protective layer coated with heat-sensitive recording layer is applied and the back has a backside coating, the backside coating comprises in addition to pigments and binders acting as a crosslinking component based on polyurethane.
• thermosensitive recording materials have proven themselves on the market quite well and solve the problem of a plasticizers, oils and fats protective backing coating quite outstanding. Both writings However, there is no indication as to how the heat-sensitive recording layer is to be protected against chemicals which can either cause an undesired color-forming reaction in the recording layer or a weakening or erasure of a typeface to be formed or formed in the recording layer and which, even in larger quantities, contained in the substrate and / or applied to the back of the substrate. The achievement of this task was preceded by the time-consuming analysis of numerous defective productions, which made it necessary to put the formulation of the task also the usual basic process for the production of heat-sensitive recording materials to the test.
• the heat-sensitive recording layer is shielded toward the substrate by the barrier layer containing ethylene-vinyl alcohol copolymer (EVOH) a perfect and - very much - lasting protection against organic solvents. Even a long-term exposure of organic solvents from the direction of the substrate is able to keep the barrier coating containing ethylene-vinyl alcohol copolymer (EVOH) from the heat-sensitive recording layer.
• EVOH ethylene-vinyl alcohol copolymer
• the heat-sensitive recording material of the present invention is produced by the roll and then stored, the front and back sides of the recording material in the roll come into contact, respectively.
• a protective layer covering the heat-sensitive recording layer, the heat-sensitive recording layer is also shielded to the outside of the next layer within a roll by the protective layer, which is also to be formed to provide good organic solvent protection.
• the barrier coating of the heat-sensitive recording material according to the invention preferably comprises at least 90 wt .-%, most preferably at least 98 wt .-% - each based on the total weight of Barrier coating, the ethylene-vinyl alcohol copolymer.
• Further constituents of this barrier coating are, for example, defoamers and / or agents for stabilizing the color curtain in the case of a possible application of the coating composition for the barrier coating by means of curtain or slide coaters.
• the coating weight for the barrier coating is preferably in a range from 0.9 to 5.0 g / m 2 , very particularly preferably in a range from 1.5 to 3.5 g / m 2 .
• Particularly suitable brushing compositions for the application of this barrier coating are, in particular, contactless application devices such as air brushes and curtain coater or slide coater, without being restricted in any way.
• a protective layer covering the heat-sensitive recording layer is of integral importance to the present invention.
• a protective layer which is the same as the barrier coating based on ethylene-vinyl alcohol copolymer (EVOH) is prepared and then preferably at least 90 wt .-%, most preferably at least 98 wt .-% - in each case based
• modified polyvinyl alcohol wherein the two values relate to the wt .-% on the total content of binder in the protective layer.
• a protective layer constructed in this way is considered to be preferred in the context of the present invention.
• the thus preferred protective layer of the heat-sensitive recording material according to the invention in addition to the diacetone-modified polyvinyl alcohol in a first possible embodiment, further binders, in particular mixtures of different carboxyl or silanol-modified polyvinyl alcohols have. These then make up a maximum of 40 wt .-%, more preferably only a maximum of 15 wt .-%, again, based on the total amount of binder in the protective layer.
• the protective layer of the heat-sensitive recording material according to the invention has as binders exclusively diacetone-modified polyvinyl alcohol.
• diacetone-modified polyvinyl alcohol is the sole binder in the protective layer covering the heat-sensitive recording layer
• Suitable crosslinking aids in the protective layer are, in particular, those selected from the group comprising: boric acid, polyamine, epoxy resin, dialdehyde, formaldehyde oligomers, epiochlorohydrin resin, adipic dihydrazide, dimethylurea, melamine-formaldehyde. It is also possible to use mixtures of different crosslinking aids.
• the ratio of the weight percent of the binder, in particular of the diacetone-modified polyvinyl alcohol, to the crosslinking aid is in a range from 20: 1 to 5: 1 and more preferably in a range from 12: 1 to 7 : 1 is.
• the protective layer additionally contains an inorganic pigment.
• the inorganic pigment is selected from the group comprising silica, aluminum hydroxide, bentonite, calcium carbonate, kaolin or a mixture of said inorganic pigments.
• roller coater, knife coater, curtain coater or air brush are particularly suitable as coating devices for applying the protective layer covering the heat-sensitive recording layer.
• the basis weight of the protective layer is preferably between 1.0 and 3.0 g / m 2 and more preferably between 1.6 and 2.3 g / m 2 .
• the configuration of the heat-sensitive recording layer is less limited.
• the recording layer may initially include all known dye precursors in principle, and combinations of several dye precursors are possible.
• the heat-sensitive recording layer has at least 33% by weight, based on the total amount of color acceptors in the heat-sensitive recording layer, as color acceptor, N- (p-toluenesulphonyl) -N'-3- (p-toluenesulphonyl-oxy-phenyl) urea according to the following formula (1), wherein the two CH 3 end molecules are also often omitted in the literature.
• N- (p-toluensulphonyl) -N'-3- (p-toluensulphonyl-oxy-phenyl) -urea is known as Pergafast ® 201 from Ciba Specialty Chemicals Inc.
• N- (p-toluenesulphonyl) -N ' -3- (p-to! Uensulphonyl-oxy-phenyl) -urea is the sole color acceptor. Based on the total weight of the recording layer, the color acceptor then makes up to 32% by weight, but preferably in the range of 18 to 30% by weight and more preferably 20 to 28.5% by weight of the heat-sensitive recording layer ,
• the recording layer of the heat-sensitive recording material of the present invention within this first embodiment may preferably also contain sensitizers to increase the thermal responsiveness.
• Sensitisers are on the one hand the substances listed in paragraph [0033];
• 2- (2H-benzotriazol-2-yl) -p-cresol according to the following formula (2) is particularly preferred, although here too the CH 3 end molecule is frequently omitted from the literature:
• 2- (2H-benzotriazol-2-yl) -p-cresol of formula (2) available as Tinuvin® from CIBA Specialty Chemicals Inc., may be used as the sole sensitizer or in combination with the sensitizers mentioned in paragraph [0033] the recording layer of the recording material according to the invention are used.
• the heat-sensitive recording layer as color acceptor is at least 66 2/3% by weight, based on the total amount of color acceptors in the heat-sensitive Recording Layer - 4,4'-Dihydroxydiphenylsulfone.
• 4,4'-Dihydroxydiphenylsulfone is also commonly referred to as 4,4'-sulfonyldiphenol and is also known under the tradename 4,4 Bisphenol S.
• 4,4'-Dihydroxydiphenylsulfone has the chemical formula C12H1004S and can be represented as the following formula (3):
• the above color acceptors are preferably incorporated into this heat-sensitive recording layer to a maximum of 10% by weight, based on the total amount of color acceptors in the heat-sensitive recording layer, the remainder being 4,4'-dihydroxydiphenylsulfone.
• 4,4'-dihydroxydiphenylsulfone is the sole color acceptor in the thermosensitive recording layer is considered to be most preferred.
• thermosensitive recording material as the dye precursor in the thermosensitive recording layer preferably comprises at least one substance selected from the list comprising: 3-diethylamino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-7-anilinofluoran, 3 (N-methyl-N-propyl) amino-6-methyl-7-anilinofluoran, 3- (N-ethyl-N-isoamyl) amino-6-methyl-7-anilinofluoran, 3- (N-methyl-N- cyclohexyl) amino-6-methyl-7-anilinofluoran, 3- (N-ethyl-N-tolyl) amino-6-methyl-7-anilinofluoran and 3- (N-ethyl-N-tetrahydrofuryl) amino-6-methyl- 7-anilinofluoran.
• Very particular preference is given to 3-dibutylamino-6-methyl-7-anilinofluoran - also known as ODB
• thermosensitive recording layer has more than one dye precursor each selected from the dye precursors listed in the above paragraph.
• the recording material according to the invention may further comprise, in addition to these substances mentioned as dye precursors, one or more of the following compounds absorbing in the near infrared range:
• the recording layer of the heat-sensitive recording material of the present invention may also preferably contain sensitisers having a melting point of preferably from 60 ° C to 180 ° C, more preferably having a melting point of from 80 ° C to 140 ° C, to increase the thermal responsiveness.
• Such sensitizers are, for example: benzyl p-benzyloxybenzoate, methylolstearamide, stearic acid amide, p-benzylbiphenyl, 1,2-di (phenoxy) ethane, 1,2-di (m-methylphenoxy) ethane, m-terphenyl, dibenzyl oxalate, Benzylnaphthylether, dimethyl terephthalate and diphenylsulfone, with methylolstearamide, and in particular stearic acid amide and dimethyl terephthalate are considered to be very preferred.
• Suitable binders for incorporation into the heat-sensitive recording layer are, for example, water-soluble binders such as starch, hydroxyethylcellulose, methylcellulose, carboxymethylcellulose, gelatin, casein, polyvinyl alcohols, modified polyvinyl alcohols, ethylene-vinyl alcohol copolymers, sodium polyacrylates, acrylamide-acrylate copolymers, acrylamide-acrylate-methacrylate Terpolymers and alkali salts of styrene-maleic anhydride copolymer or ethylene-maleic anhydride copolymer, which binders can be used alone or in combination with one another; Water-insoluble latex binders such as styrene-butadiene copolymers, acrylonitrile-butadiene copolymers and methyl acrylate-butadiene copolymers also offer themselves as binders for incorporation into the heat-sensitive recording layer at.
• water-soluble binders such as starch, hydroxy
• polyvinyl alcohol ethylene-vinyl alcohol copolymers or polyvinyl alcohol in conjunction with ethylene-vinyl alcohol copolymers as particularly preferred binders which together, based on the total weight of the recording layer, in a range of 10 to 20 wt .-% in the heat-sensitive recording layer is incorporated.
• the coating composition for forming the heat-sensitive recording layer may further contain lubricants and release agents such as metal salts higher fatty acids, for example, zinc stearate, calcium stearate, and waxes, such as paraffin, oxidized paraffin, polyethylene, polyethylene oxide, stearamides, and castor wax.
• lubricants and release agents such as metal salts higher fatty acids, for example, zinc stearate, calcium stearate, and waxes, such as paraffin, oxidized paraffin, polyethylene, polyethylene oxide, stearamides, and castor wax.
• pigments preferably inorganic pigments such as, for example, aluminum (hydr) oxide, silicic acid and calcium carbonate, in which case in particular calcium carbonate, preferably in an amount of from 0 to 28% by weight, based on the total weight of the recording layer, should be included in the recording layer, as is preferred.
• inorganic pigments such as, for example, aluminum (hydr) oxide, silicic acid and calcium carbonate, in which case in particular calcium carbonate, preferably in an amount of from 0 to 28% by weight, based on the total weight of the recording layer, should be included in the recording layer, as is preferred.
• the heat-sensitive recording layer - offer in particular roller blade coater, knife coater, curtain coater or air brush.
• the coating composition used to form the recording layer is aqueous.
• the subsequent drying of the coating composition is usually done by a method in which heat is supplied, as is done by hot-air floating dryer or contact dryer. Proven is also a combination of the listed dry processes.
• the basis weight of the heat-sensitive recording layer is preferably from 2 to 6 g / m 2, and more preferably from 2.2 to 4.8 g / m 2 .
• the heat-sensitive recording material according to the invention comprises a pigment-containing intermediate layer, which is arranged between the barrier coating and the heat-sensitive recording layer.
• Suitable pigments of the intermediate layer are both organic void pigments and inorganic pigments, the latter preferably selected from the group comprising natural and calcined kaolin, silica and in particular bentonite, calcium carbonate and aluminum hydroxide and here especially boehmite.
• organic void pigments and inorganic pigments the latter preferably selected from the group comprising natural and calcined kaolin, silica and in particular bentonite, calcium carbonate and aluminum hydroxide and here especially boehmite.
• such an intermediate layer can make a positive contribution to the leveling of the surface to be coated, which reduces the amount of coating color necessarily to be applied for the heat-sensitive recording layer. For this reason, offer to coat the pigment-containing intermediate layer leveling coating, such as Walzenstreichwerke, doctor blade and (roll) doctor blade coating.
• the pigments of this intermediate layer can absorb the heat-liquefied wax constituents of the thermosensitive recording layer in the typeface formation and thus promote a safe and rapid operation of the heat-induced recording.
• the basis weight of the pigment-containing intermediate layer is preferably between 5 and 20 g / m 2 and more preferably between 7 and 11 g / m 2 .
• paper is the substrate that has prevailed on the market with regard to the good environmental compatibility because of good recyclability and is preferred in the context of the invention.
• the barrier coating between the substrate and heat-sensitive recording layer it is possible due to the arrangement of the barrier coating between the substrate and heat-sensitive recording layer, to use those substrates that would rather prohibit due to their ingredients and their negative influence on the heat-sensitive recording layer such as films or films coated papers in which the respective films Contain larger amounts of plasticizers, or papers from recycled fibers of the lowest quality.
• the proposed heat-sensitive recording material has a coating of a tincture applied to the substrate in the form of at least one character or in the form of a pattern, the tincture comprising at least one organic solvent. It is also possible that the tincture comprises a mixture of several organic solvents. In a preferred Embodiment are also included in the tincture other ingredients such as fluorescent fibers and / or pigments.
• Applying the tincture with at least one organic solvent to the substrate formed to form the paper authentication feature causes the opacity of the substrate to change at the sites wetted with the tincture relative to the non-wetted areas of the substrate. If one keeps the thus treated, here proposed heat-sensitive recording material against a light source, makes the change in transparency in the review sharp-edged as easily recognizable image or pattern.
• analog printing methods such as, for example, the flexographic and gravure printing methods are particularly suitable.
• the tincture is applied by means of digital printing methods. If the order of tincture digital printing technology, which is considered preferable and what is given, inter alia, in the inkjet printing process, the formation of an individual authentication feature per single section of the proposed here heat-sensitive recording material is made possible. If the heat-sensitive recording material proposed here is used as a ticket and / or in particular as an admission ticket, each individual ticket can be provided with an individual authentication feature.
• the heat-sensitive recording material proposed here as a ticket, very particularly preferably as an admission ticket.
• a paper web of bleached and ground deciduous and softwood pulps with a basis weight of 130 g / m 2 with the addition of conventional additives in conventional amounts is first prepared on a fourdrinier paper machine as a substrate. From the paper web 3 sample rolls are cut for further treatment.
• the coating material used for the heat-sensitive recording layer essentially contains the following components: Dye precursors: 3-dibutylamino-6-methyl-7-anilinofluoran, that is ODB-2; color acceptor: N- (p-toluensulphonyl) -N '-3- (p-toluensulphonyl-oxy-phenyl) -urea, which is Pergafast® 201; sensitizer: Benzylnaphthyl ether, that is BNE; Binder: polyvinyl alcohol; co-binders: Acrylate copolymer; Pigment: Calcium carbonate.
• a protective layer of 2.0 g / m 2 is applied to the heat-sensitive recording layer by means of air brushing in each case for all 3 pattern rolls.
• a coating composition which essentially contains the following components: Binder: Diacetone-modified polyvinyl alcohol; 61.3% by weight (atro) crosslinkers: adipic; 6.0% by weight (atro) Pigment: Kaolin; 16.6% by weight (atro) Lubricant: Hidorin Z-7-30; 8.1% by weight (atro) aids: pH regulator, optical brightener; 8.0% by weight (atro)
• the desired barrier effect of the barrier layer against organic solvents should then be investigated.
• 0.5 ml of ethanol is applied to the respective reverse side of test strips from the 3 sample rolls corresponding to Example 1 according to the invention and the two comparative examples 2 and 3 using a pipette. After a respective exposure time of 10 minutes, the ethanol is completely absorbed. The effect of the solvent application on the heat-sensitive recording layer is visually evaluated.
• the heat-sensitive recording layer of Inventive Example 1 shows no thermal reactions at all, the present invention is excellently confirmed in terms of quality.
• Comparative Example 2 shows an intense thermoreactions, this barrier coating is not at all suitable to develop a far-reaching protective effect against organic solvents from the direction of the substrate over a longer exposure time.
• Comparative Example 3 there are scattered color reaction points on the heat-sensitive recording layer: below these colored dots, the barrier coating of the coating composition BS3 has cracks and voids due to the too high viscosity of the silanized polyvinyl alcohol. Again, the barrier effect against organic solvents is not convincing, because not without flaws.
• thermosensitive recording material finally expected by the inventors.

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• 2009
  • 2009-12-01 ES ES09177678T patent/ES2394407T3/es active Active
  • 2009-12-01 EP EP20090177678 patent/EP2329959B1/fr not_active Not-in-force
• 2010
  • 2010-09-13 US US13/512,979 patent/US9050844B2/en active Active
  • 2010-09-13 WO PCT/EP2010/063412 patent/WO2011067004A1/fr active Application Filing

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