Classifications

• • 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
  • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
• • 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
  • B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
  • B41M5/366—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties using materials comprising a polymeric matrix containing a polymeric particulate material, e.g. hydrophobic heat coalescing particles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
  • B42D25/29—Securities; Bank notes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
  • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
  • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
  • B42D25/30—Identification or security features, e.g. for preventing forgery
  • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
  • B42D25/378—Special inks
  • B42D25/387—Special inks absorbing or reflecting ultraviolet light
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
  • Y10T428/24835—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including developable image or soluble portion in coating or impregnation [e.g., safety paper, etc.]
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
  • Y10T428/24893—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including particulate material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
  • Y10T428/249971—Preformed hollow element-containing
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/249921—Web or sheet containing structurally defined element or component
  • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
  • Y10T428/249975—Void shape specified [e.g., crushed, flat, round, etc.]

Definitions

• the invention relates to a security feature in the form of a luminescent marking for inclusion in a recording material and a heat-sensitive recording material, in which a security feature of the proposed type is incorporated.
• Recording materials determine daily life in society and in professional life. For the use of recording materials, the authorized use of which is generally to be demonstrated by a specific marking of the material approved for this purpose, various solutions of authenticity-proofing security features have already been proposed in the past.
• Authenticity proofs for documents in the form of passive examinations are made possible, for example, by watermarks.
• a watermark in the original sense is understood to mean a drawing in the paper that is caused by different paper thicknesses.
• genuine watermarks which are produced by displacement (so-called light watermarks) or by enrichment (so-called shadow watermarks) of the fiber mass, for example using a dandy cutter in the wire section of a paper machine, so-called molten watermarks.
• DE 690 01 677 T 2 discloses the proposal for a synthetic print carrier with pseudo-water mark, which is a plastic substrate, at least one, preferably gravure printed, the opacity of the Print carrier changing authentication and at least one printable pigment coating covering the indicia.
• the monochrome or polychrome character should hardly be visible in reflected light, but should be clearly visible in transmitted light.
• a disadvantage of the known print carrier is that the printed pseudo watermark can be counterfeited relatively easily, which can not be prevented even by simple pigment coatings to be applied thereto.
• thermosensitive recording material discloses, as a first security feature, a latent image printed on the back side of the recording material, which is produced by means of a security ink containing a fluorescent reagent.
• the security ink contains a water-repellent agent.
• the thus constructed security ink with the fluorescent reagent in the form of pigment or dye and with the water-repellent agent is contained or dispersed in an aqueous vehicle, which may contain a binder other than these components.
• the disadvantage of this proposal is first that the water-repellent character of the security ink complicates the often common arrangement of pictorial Vorbedruckieux or labels by means of the usual printing process.
• the object is to provide a universal security feature for inclusion in a recording material that is difficult to fake as possible.
• Another object is, in particular, a heat-sensitive To provide recording material with a new security feature that is as universally applicable and difficult to fake as possible.
• the inventor first recognized in general that basically the above-mentioned prior art can be summarized such that the closer the creation of a security feature in the manufacturing and processing chain is moved to the original production point, the more difficult is the imitation of the security feature in fraudulent intent.
• a security feature coated with one, ideally still aftertreated, or further coatings satisfies to a very particular extent the requirement profile of the security feature of a counterfeiting or imitation intended for counterfeiting which is as far as possible unrealizable.
• the object can be achieved with a security feature in the form of a luminescent label for incorporation into a recording material, the security feature having a radiation layer with luminescent constituents and a masking layer with hollow-shell pigments at least partially covering the radiation layer, and wherein the cavity pigments of the masking layer are fused by localized heat treatment in the form of a marking.
• the radiation layer added pigments, colors - such as optical brighteners - and treated with such pigments or dyes particles, such as fibers excited by energy absorption for light emission can be.
• the luminescent constituents are to be understood as those which can be excited by excitation with UV light for the emission of visible light over a period of fractions of a second to more than half an hour.
• Such ingredients are referred to as fluorescent within the meaning of this invention and are considered to be particularly preferred.
• the hollow-body pigments of the masking layer have a wall of plastic which melts under high heat input, ideally of thermoplastic material.
• Shiny resin This thermoplastic resin or the Hohlraumpigment- outer wall itself preferably comprises (meth) acrylonitrile copolymer, polyvinyl chloride, polyvinylidene chloride, polystyrene, styrene acrylate, styrene (meth) acrylate copolymer, polyacrylonitrile, polyacrylate or the mixture of at least two of the above Components on.
• pigment mixtures of different hollow-shell pigments are conceivable for the masking layer.
• cup-shaped pigments are also considered as hollow-shell pigments, in contrast to conventional hollow-shell pigments in which an inner core of gas, usually of air, is completely enclosed by a shell of organic, usually thermoplastic constituents ,
• a glass transition temperature for the thermoplastic resin of the outer shell Hohlraumpigment in a range of 35 0 C to less than or equal to 200 0 C and preferably in a range of 75 0 C to less than or equal to 120 0 C was found to be advantageous because below of temperatures of 35 0 C, the wall of the cavity pigments at room temperature is no longer sufficiently stable. Above temperatures of 200 0 C, there are handling problems in terms of excessive heating of the surface of the recording material.
• the preferred temperature range between 75 0 C to less than or equal to 120 0 C provides the simplest conditions in terms of processing quality and speed at the completion of the proposed security feature by merging the Hohlraumpigmente in the form of a pattern.
• the security feature according to the invention whose radiation layer with the luminescent or preferably under UV light fluorescent constituents initially opaque covered by the masking layer with the Hohlraumpigmenten. Because of the opacity of the masking layer caused by the hollow-shell pigments, no luminescence or fluorescence of the radiation layer can thus be detected.
• the cavity pigments of the masking layer are fused, for example by means of the printhead of a thermal printer.
• the Hohf raumpigmente no longer in the form of individual particles, each consisting of a thermoplastic shell and in its interior of an enclosed by the shell core with air, but in the form of a uniform, milky translucent enamel layer, which has thus lost its opacity.
• the loss of opacity is explained by the different refractive indexes of the plastic wall of the cavity pigments and the air in the interior of the non-fused cavity pigments.
• the radiation layer and the masking layer of the proposed security feature should have the same color, since at the heat treated areas the masking layer becomes transparent and releases the view of the radiation layer arranged below it.
• the color for the radiation layer and for the masking layer of the proposed security feature is particularly suitable for whitening, since the masking layer is already white because of the non-fused state of white cavity pigments without the addition of further pigments or colors.
• the proposed security feature can also be used without restriction with a bright coloring of the radiation layer and the masking layer and is consequently regarded as a possible form of the proposed security feature.
• An important advantage of the security feature according to the invention is its completion in the form of an individual pattern using, for example, a thermal printer only after completion of production of the two layers of the proposed security feature having recording material.
• Figure 1 shows the basic structure of the security feature according to the invention with a radiation layer (1) and a radiation layer (1) covering masking layer (2).
• the areas (2-1) of the masking layer (2) are those in which the cavity pigments are fused by heat treatment and why the masking layer (2) is milky translucent at these areas (2-1), hatched, while the areas (2-2) of the masking layer (2) are uniformly blackened with unfused cavity pigments - indicative of opaque coverage ,
• the areas (2-1) of the masking layer (2) are those in which the cavity pigments are fused by heat treatment and why the masking layer (2) is milky translucent at these areas (2-1), hatched, while the areas (2-2) of the masking layer (2) are uniformly blackened with unfused cavity pigments - indicative of opaque coverage .
• a recording material having the new security feature comprises a luminescent constituent white substrate as the radiation layer.
• the masking layer is applied, for which in principle a range with respect to the area-related mass between 1 and 6 g / m 2 is considered preferred, is considered to be very particularly preferably a range between 2 and 3 g / m 2 .
• the coverage of the radiation layer is often no longer sufficiently to ensure, while forming the masking layer with a basis weight of well over 6 g / m 2 for economic reasons does not make sense.
• the masking layer generally has, in addition to the hollow-shell pigments with a percentage weight fraction based on the total weight (atro) of the masking layer in a preferred range of from 50 to 95% by weight, only binders in the required amount.
• the Hohlraumpigmente are partially fused in the form of a pattern.
• the luminescent constituents are fluorescent under UV light
• the recording material appears white under daylight, there is no indication of any incorporated security feature.
• the fluorescent components of the substrate become visible at the positions through the masking layer where the cavity pigments of the masking layer are fused by heat treatment.
• a protective layer or the printability - if necessary, also in the inkjet process - improving pigment coating may be applied to the masking layer, a protective layer or the printability - if necessary, also in the inkjet process - improving pigment coating.
• a protective layer weakens the recognition of the incorporated security feature, but remains at a white or not darkened pigment coating and even more so in a preferably colorless designed protective layer visible at the fused sites through the masking layer fluorescence from the radiation layer sufficiently visible.
• Figure 2 shows a recording material with the security feature according to the invention, wherein the recording material is designed in one of its simplest embodiments.
• the masking layer (2) is applied, the Hohlraumpigmente are fused by means of a print head of a Thermod jerkers in the form of a pattern.
• the masking layer (2) completely covers the underlying substrate (11).
• the masking layer (2) is in turn covered by a protective layer (40).
• a separate first coating as a radiation layer with the luminescent / fluorescent constituents is preferred.
• a surface-related mass for the radiation layer in a range of 5 g / m 2 to 20 g / m 2 is preferred.
• the percentage by weight of luminescent / fluorescent constituents in the radiation layer related to the total weight (atro) of the radiation layer is preferably in a range from 0.2 to 5% by weight (atro).
• such a heat-sensitive recording material comprises a radiation layer with luminescent constituents which fluoresce under UV light in a preferred embodiment and a masking layer comprising hollow-body pigments at least partially covering the radiation layer, wherein the cavity pigments of the masking layer are produced by locally limited heat treatment in the form of a marking are fused or can be merged.
• the radiation layer comprising the luminescent constituents, which are preferably fluorescent under UV light, and the masking layer containing the hollow-content pigments of the proposed heat-sensitive recording material should preferably have the same color.
• luminescent components or preferably components which fluoresce under UV light are incorporated into the substrate as the radiation layer of the proposed heat-sensitive recording material.
• a masking layer is applied with Hohlraumpigmenten, which are fused by localized heat treatment in the form of a marker.
• a heat-sensitive recording layer having at least one dye precursor and at least one color acceptor, the dye precursor and color acceptor reacting with each other in a color-forming manner under the action of heat.
• the heat-sensitive recording layer can completely and completely cover the masking layer arranged below it in a first variant.
• the heat-sensitive recording layer is applied to the masking layer only a few centimeters in size in the form of small, for example, rectangular or circular surface areas - so-called "spots" - this means preferably imprinted
• areas covered by the masking layer are adjacent While the areas with the spot-like heat-sensitive recording layer are particularly suitable for the formation of individual fields, for example with seat numbers on entrance tickets, the remaining areas can be covered by areas which are covered by the heat-sensitive recording layer with underlying masking layer. areas covered not with the heat-sensitive recording layer but only with the masking layer, in particular frame information, for example event marking and advertising on tickets, by being printed accordingly, for example by flexographic printing.
• the heat-sensitive recording layer can also be applied to the substrate first, which in turn is at least partially covered by the subsequently applied masking layer with the hollow-shell pigments.
• the substrate can act as a radiation layer with the luminescent or preferably under UV light fluorescent constituents, wherein the heat-sensitive recording layer is formed as transparent as possible to let the luminescence or Fluoreszenzstrahiung the substrate shine through as unhindered, or the heat temp sensitive recording layer contains the luminescent or preferably under UV light fluorescent constituents and acts as a radiation layer.
• both substrate and heat-sensitive recording layer have the luminescent or preferably under UV light fluorescent constituents, just as it is generally possible for all proposed embodiments and variants of the present invention, that two ü- arranged one above the other Layers are formed as radiation layers.
• the two radiation layers then to have different luminescent or preferably UV-fluorescent components which emit, for example, light of different colors, as well as different luminescent or preferably UV-fluorescent components in only one radiation layer according to all embodiments and variants of the proposed invention are possible.
• the proposed thermosensitive recording material comprising a substrate, a heat-sensitive recording layer and a masking layer comprises at least one intermediate layer interposed between the substrate and the thermosensitive recording layer and functioning as a radiation layer. If the intermediate layer is in a preferential zugten embodiment applied with gratis areden coating devices, such as roller coater, doctor blade or (RoII-) Rakelstreichwerke, the intermediate layer can also make a positive contribution to equalization of the substrate surface, which reduces the amount of necessarily applied coating material for the heat-sensitive recording layer.
• the percentage by weight of luminescent / fluorescent components based on the total weight (atro) of the intermediate layer is preferably in a range of 0.2 to 5% (atro).
• inorganic oil-absorbing pigments are incorporated into the interlayer underneath the heat-sensitive recording layer, these pigments can absorb the wax constituents of the heat-sensitive recording layer liquefied by heat from the thermal head in the case of typeface formation and thus promote a still safer and faster functioning of the heat-induced recording which is of particular importance because of a possible energy-absorbing masking layer It. of a claimed embodiment applied to the recording layer.
• a layer structure is possible in which above the pigmented and formed as a radiation layer intermediate layer, first the masking layer and then the heat-sensitive recording layer is applied.
• Preferred inorganic pigments of the intermediate layer are those selected from the group comprising natural and calcined kaolin, silica, bentonite, calcium carbonate and alumina, and in particular boehmite here. Also mixtures of several different types of inorganic pigments are conceivable.
• the particle size of the inorganic pigments present in the intermediate layer as D 50 white is preferably in a range of less than 2 ⁇ m. Pigments which have a particle size distribution of from 34 to 40% by weight of less than 1 ⁇ m and from 57 to 63% by weight of less than 2 ⁇ m have proved to be advantageous.
• the pigmented intermediate layer contains at least one binder preferably based on a synthetic polymer, wherein, for example, styrene-butadiene latex gives particularly good results.
• the use of a synthetic binder with admixture of at least one natural polymer is a particularly suitable embodiment. It has also been found in experiments that with a binder to pigment ratio within the pigmented interlayer between 1:10 and 1:20 a particularly suitable embodiment is present.
• the proposed heat-sensitive recording material preferably has a protective layer, the completely covers the recording material on the recording layer side.
• the protective layer can be applied both to the recording layer and to the masking layer.
• the protective layer embodied in one or more layers can be a coating applied conventionally in a coating machine by means of a curtain or spray coater, airbrush, doctor blade or doctor blade coating, wherein here one has surface mass in a range of 1.5 to 6 g / m 2 and especially between 1, 8 and 4 g / m 2 has proven.
• the protective layer initially contains one or more inorganic pigments, wherein in particular the incorporation of a highly purified alkaline-treated bentonite is advantageous.
• Other pigments are in particular natural or precipitated calcium carbonate, kaolin, titanium oxide and especially aluminum hydroxide and silicas.
• the protective layer contains one or more binders, for example selected from the list comprising water-insoluble, self-crosslinking acrylic polymers, polyvinyl alcohol and polyvinyl alcohol derivatives, in particular silanized polyvinyl alcohol, and also If appropriate, and depending on the selected binders and crosslinking agents.
• crosslinking agents cyclic urea, methylolurea, polyamide-epichlorohydrin resin, ammonium zirconium carbonate and glyoxal are particularly suitable here.
• the proposed recording material may also preferably have a crosslinkable under the influence of UV radiation protective layer, which optionally applied classically by means of curtain or spray coater, air brush, doctor blade or (RoII) doctor blade coating or printed in a very particularly preferred embodiment.
• UV radiation protective layer which optionally applied classically by means of curtain or spray coater, air brush, doctor blade or (RoII) doctor blade coating or printed in a very particularly preferred embodiment.
• the masking layer is located in the form of a pattern of fused cavity pigments.
• the masking layer acts on the at least one intermediate layer acting as the radiation layer and then the masking layer heat-sensitive recording layer is coated with the final protective layer.
• Both embodiments are suitable to a very special extent to provide a heat-sensitive recording material with high environmental resistance and individually producible, difficult to falsifying security feature of the public, which is why they are considered to be preferred in a very special degree.
• the heat-sensitive recording layer is applied to this masking layer only in the form of small areas - so-called "spots", which are preferably printed on top Areas before that are covered by the heat-sensitive recording layer with underlying masking layer.
• the recording material in this case has a polyolefin coated paper as a substrate (10) on which an interlayer (21) formed as a radiation haze with here, for example, fluorescent under UV light colors formed ) is applied.
• the intermediate layer (21) is covered over its entire surface with a masking layer (2), the hollow-shell pigments of which are partially fused in the form of a pattern.
• the masking layer (2) may additionally comprise inorganic oil-absorbing pigments which suppress the wax components of the heat-sensitive recording layer (30) liquefied by heat of the thermal head ) can take in the typeface education.
• thermosensitive recording layer 30 is applied to the masking layer 2 only in the form of small areas ("spots").
• the recording material is covered on the side with the heat-sensitive recording layer (30) by means of a protective layer (40) because of the "spot” type formation of the thermosensitive recording layer (30) is partially applied on the masking layer (2) and partly on the thermosensitive recording layer (30).
• FIG. 4 is another embodiment of the proposed heat-sensitive recording material with security feature! shown.
• a substrate (10) in this case made of a non-surface-treated coated base paper has a first leveling intermediate layer (20) and a second intermediate layer (21) formed as a radiation layer with pigments that fluoresce under UV light. Since a heat-sensitive recording layer (30) is to be applied to the second intermediate layer (21), the second intermediate layer (21) additionally contains, in addition to the UV-fluorescent pigments, inorganic oil-absorbing pigments which reduce the heat constituent of the heat-sensitive element liquefied by the thermal action of the thermal head Recording layer (30) in the writing to take up image training.
• the heat-sensitive recording layer (30) is applied over the entire surface to the second intermediate layer (21).
• On the heat-sensitive recording layer (30) are first applied a masking layer (2) with partially fused in the form of a pattern Hohlraumpigmenten and then a protective layer (40).
• such a heat-sensitive recording material according to the invention whose hollow-shell pigments are fused in the form of a pattern belonging to the security feature, causes the print head to form the typeface in the recording layer, for example when the recording material is fed to the thermal printer
• the cavity pigments of the masking layer are fused at the places where the typeface is caused in the recording layer, thus revealing the typeface formed in the recording layer.
• thermosensitive recording material In order to increase the color forming temperature or to reduce the color forming sensitivity, there is a well-known and industrially used and preferred way for all embodiments and variants of the proposed thermosensitive recording material in the incorporation of at least one compound from under the action of heat color-forming mutually reactive dye precursor and color acceptor in microcapsules, which are incorporated into the heat-sensitive recording layer. Especially in the production of multicolored heat-sensitive recording materials, the encapsulation of dye precursor and / or dye acceptor is common.
• thermosensitive recording layer covering, optionally multilayer protective layer and according to a variant, the arrangement of the masking layer between thermosensitive recording layer and protective layer increases the distance between the recording layer and the print image causing printhead of a thermal printer. As the distance between the recording layer and the printhead of the thermal printer becomes larger, the resolution inevitably deteriorates, and the resolution is approximately inversely proportional to the square of the distance between the recording layer and the thermal head.
• a heat-sensitive recording layer which effectively counteracts this physical effect by guaranteeing optimized resolution, is of particular importance against this background.
• the heat-sensitive recording layer may contain all known dye precursors and, in particular, color acceptors suitable for this purpose, in particular organic dye acceptors. Without being limited thereto, however, particularly preferred dye precursors are selected from the group comprising
• the limits are given upwards by a too low sensitivity and down by an otherwise too strong inclination of the heat-sensitive recording material for graying.
• Roll coating coater, knife coater, curtain coater or air brush are particularly suitable as coating apparatus for applying the heat-sensitive recording layer.
• the coating composition used to form the recording layer is aqueous.
• the subsequent drying of the coating material 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 2.3 to 5.8 g / m 2 .
• paper and especially a non-surface treated base paper is preferably in a range for the basis weight between 50 and 180 g / m 2 substrate, which is also in the market with regard to the good Environmental compatibility due to good recyclability has enforced and which is preferred for the purposes of the invention.
• a non-surface treated base paper is to be understood as meaning a base paper not treated in a size press or in a coating device.
• films of, for example, polyolefin and polyolefin-coated papers as a substrate are possible to the same extent, without such an embodiment having an exclusive character.
• the heat-sensitive recording material according to the invention is equipped as a label with back (self) adhesive layer.
• the adhesive layer can be covered with a release material such as a silicone-containing release paper or the outer protective layer of the novel recording material is provided with an additional release layer which is preferably printed - ideally by means of flexographic printing.
• the release layer in this case has release agents based on silicone oil and / or silicone grease.
• the release layer under the influence of high-energy radiation, such as UV or electron radiation, hard or crosslinkable.
• high-energy radiation such as UV or electron radiation
• the monomers or prepolymers used for the preparation of this layer must contain additives of photoinitiators in a known manner.
• electron beam curing a particularly uniform over its cross-section, that is cured release layer could be achieved.
• the intermediate layer under UV light contains fluorescent colors in the form of optical brighteners in an amount of 2% by weight (atro), based on the total weight of the intermediate layer (atro).
• a masking layer is applied to the intermediate layer using a roller blade coater and dried with 16.67% by weight of (atro) binder and 83.33% by weight of voided pigments. In this case, the percentages are based on the total weight (atro) of the finished masking layer whose basis weight is 2.5 g / m 2 .
• the finished paper is fed to a thermal printer.
• the cavity pigments of the masking layer are partially fused in accordance with a predetermined check pattern by the printhead of the thermal printer, so that areas in the masking layer with fused hollow-shell pigments and areas with unfused hollow-space pigments are formed. Under daylight, the paper coated with radiation and masking layer appears uniformly white.
• Example 1 paper with substrate, formed as a radiation layer intermediate layer and the masking layer applied thereto is provided with a heat-sensitive recording layer, which is applied over the entire surface with a basis weight of 4 g / m 2 on the masking layer.
• the heat-sensitive recording layer comprises 13.89% by weight of binder, 27.78% by weight of color acceptor, and 58.33 of encapsulated dye precursors.
• the method described in DE 198 54866 A1 has been used as the encapsulation method.
• a UV-curable protective layer of 2 g / m 2 has been applied by flexographic printing. The thus-finished heat-sensitive recording paper is fed to a thermal printer.
• the cavity pigments of the masking layer are partially fused in accordance with a predetermined fringe pattern by the printhead of the thermal printer at a temperature Ti of 101 ° C., so that areas in the masking layer with fused hollow-shell pigments and areas with unmelted hollow-space pigments are formed.
• a temperature T 2 of 145 0 C is generated in the heat-sensitive recording layer by the print head of the thermal printer a predetermined typeface.
• the heat-sensitive recording paper appears uniformly white with a thermoformed image.
• UV light strong fluorescence can be seen at the areas of the masking layer in which the cavity pigments are fused together by the heat input of the printhead of the thermal printer.
• the fluorescence originates from the fluorescent constituents of the intermediate layer, whose emitted light rays can be recognized by the transparent regions of the masking layer with the cavity pigments fused there.

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• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Business, Economics & Management (AREA)
• Accounting & Taxation (AREA)
• Finance (AREA)
• Heat Sensitive Colour Forming Recording (AREA)
• Materials For Medical Uses (AREA)
• Glass Compositions (AREA)
• Developing Agents For Electrophotography (AREA)

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• 2005
  • 2005-06-22 EP EP20050759525 patent/EP1778499B1/fr not_active Not-in-force
  • 2005-06-22 DE DE200550004468 patent/DE502005004468D1/de active Active
  • 2005-06-22 AT AT05759525T patent/ATE398534T1/de not_active IP Right Cessation
  • 2005-06-22 WO PCT/EP2005/006746 patent/WO2006136188A1/fr active IP Right Grant
  • 2005-06-22 ES ES05759525T patent/ES2308516T3/es active Active
  • 2005-06-22 JP JP2008517328A patent/JP4751447B2/ja not_active Expired - Fee Related
  • 2005-06-22 US US11/791,622 patent/US8524633B2/en not_active Expired - Fee Related

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