CA2046711C - Multilayer optically variable element - Google Patents

Multilayer optically variable element Download PDF

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Publication number
CA2046711C
CA2046711C CA002046711A CA2046711A CA2046711C CA 2046711 C CA2046711 C CA 2046711C CA 002046711 A CA002046711 A CA 002046711A CA 2046711 A CA2046711 A CA 2046711A CA 2046711 C CA2046711 C CA 2046711C
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Prior art keywords
layer
optically variable
transfer material
substrate
variable transfer
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CA002046711A
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French (fr)
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CA2046711A1 (en
Inventor
Wittich Kaule
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GAO Gesellschaft fuer Automation und Organisation mbH
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GAO Gesellschaft fuer Automation und Organisation mbH
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B2038/0052—Other operations not otherwise provided for
    • B32B2038/0092—Metallizing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0244—Surface relief holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/024—Hologram nature or properties
    • G03H1/0248—Volume holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2227/00—Mechanical components or mechanical aspects not otherwise provided for
    • G03H2227/04—Production line for mass production
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2240/00—Hologram nature or properties
    • G03H2240/50—Parameters or numerical values associated with holography, e.g. peel strength
    • G03H2240/55—Thickness
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/10—Laminate comprising a hologram layer arranged to be transferred onto a carrier body
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/33—Absorbing layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/39—Protective layer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Accounting & Taxation (AREA)
  • Finance (AREA)
  • Holo Graphy (AREA)
  • Credit Cards Or The Like (AREA)
  • Optical Integrated Circuits (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

In a multilayer optically variable element, preferably a hologram, comprising an adhesive layer covered by an easily removable cover layer, and at least one layer having the optically variable effect, the protective layer is designed as a self-supporting and dimensionally stable layer with a thickness of a few micrometers.

Description

A multilayer optically variable element The present invention relates to a multilave=
optically variable e:ie~ment, preferably a hologram. It aisc relates to a substrate equipped with the optically variable element and to a method for producing the optically variable element.
Optically variables elements are primarily understood to be holograms and diffraction grids, but they may also be other elements having an optically visible effect that changes in accordance with the viewing angle and/or irradi-ated wavelength due to characteristic interference effects, reflection, transmission, absorption and other properties.
Holograms are customarily produced in the form of sheet-like labels and transferred to the desired substrate, such as paper, plastic, textile material or the like, by means of a contact adhesive or a hot embossing transfer technique. It is also known to emboss holograms directly into layers of lac-quer disposed on the substrate. The holograms are hardened after embossing by exposure to UV light or electron beams.
Holograms are increasingly used as authenticity features for protecting papers of value and cards employed in cashless money transfer. Such holograms must firstly be tamper-=esist-ant, i.e. virtually undetachable from the carrier. Further-more, they must withstand considerable mechanical stresses over a long time without showing any noticeable changes.
Holograms consisting of plastic films affixed to a sub-strate with a contact adhesive have relatively high stabili-ty, i.e. they are most suitable for withstanding the mechani-cal stresses that arise. A disadvantage, however, is their thickness and the resulting rigidity, that makes it impossi-ble to employ such adhesive labels for protecting bank notes, for example.
Holograms that are embossed into a thin layer of lacquer disposed on the substrate can be used in many ways, for exam-ple in bank notes due to their small thickness. However, the layer of lacquer is very sensitive to mechanical and chemical stresses. They are therefore unsuitable for protecting papers of value and cards which are used daily for some time.
German laid open patent application publication DE-OS
33 08 831 published on May 10,1984 discloses a hologram that can be applied to a substrate by the transfer method.
To permit better hand7_ing of the relatively thin hologram it is connected by a reparation layer with a relatively stable carrier film that can be removed after the hclogram has been applied to the substrate. This technique permits the application of relatively thin-layer holograms that can hardly be handled as ~~uch due tc their low dimensional stability and rigidit~T. This property is utilized to rule out a subsequen- detachment of the hologram for purposes of manipulation. On the other hand, the hologram can be machined together with the carrier film, for example, brought together with a substrate i~: a roll slit.
The known hologram has on its side facing away from the carrier film a hot-melt adhesive layer permitting labels to be transferred to a substrate, their contour corresponding exactly to the contour of a heated die with which the com-pound material is pressed against the substrate. After the carrier layer is detached the known hologram is protected by a thermoplastic transparent layer that has no dimensional stability and is not self-supporting so as to prevent detach-ment. This thermoplastic protective gayer does not impede the transfer to the substrate in any way since it tears in the edge area of the heated transfer die when the carrier film is removed after the hologram has been pressed onto the sub-strate, thus also permitting easy detachment of those areas which are not loaded by the transfer die. However, it must be regarded as a serious disadvantage that this thermoplastic protective layer is relatively soft and unresistant. A holo-gram protected with such a layer does not withstand mechani-cal and chemical environmental influences for any length of time.
The present invention is based on the problem of provid-ing an optically variable element that has minimal thickness while being maximally resistant to environmental influences, i.e. to abrasion, crumpling, soiling, washing, chemicals, etc., and that is easy to produce, on the one hand, while being transferable to a substrate without difficulty by means of a transfer method, on the other hand.
This problem is sclved according to the invention which resides in providing multilayer optically variable element having an adhesive layer (22), at least one layer (16, 18, 20) having the optically variable effect, at least one protective layer (14) and a removable carrier layer (10), characterized in that the protective layer (14) is designed as a self-supporting and dimensionally stable layer having a thickness of from a few micrometers t-o about 20 ~.
The invention is based on the finding that the hologram can in fact be mechanically unstable for security reasons but the protective layer of the hologram must not be an unstable, non-self-supporting film but rather a layer that withstands mechanical loads to a maximal degree despite its small thick-ness. A particularly suitable film has proven to be one made of PC, PVF, PETP, PCTFE or FEP with a thickness of from a few micrometers to about 20 u, in particular in the range of 10 u. Since such thin films cannot be handled by machines the film compound is combined, in the basically known way, with a carrier film that is r~amoved after the hologram has been applied to the substrate.
When holograms are .applied the contour of the particular plane element is prepun~~hed in the thin protective film, so that it is readily posaible to detach or extract the hologram from the surrounding m<~teriai.

3a Replacing the known unstable layer by an equally thin but extremely resistant film, for example of polycarbonate (PC), polyvinyl fluoride (PVF), polyethylene terephthalate (PETP), polychlorotrifluoroet:hylene (PCTFE), tetrafluoroethylene/
hexafluoropropylene copolymer (FEP), together with the meas-ure of prepunching th~~ hologram contours, results in a holo-_~ , 4 , gram that combines in an unprecedented way the advantages of particularly small thickness with the advantages of excellent mechanical durability. With consideration of possible securi-ty aspects the layer supporting the hologram should be dimen-sioned without any great inherent strength, while the protec-tive film should be selected in terms of thickness and mate-rial properties such that when applied to the substrate it can sufficiently protect the hologram layer from mechanical and other loads, on the one hand, but is dimensioned such that subsequent detachment leads at least to an irreversible deformation or destruction, on the other hand. A protective film of PC, PVF, PETP, PCTFE or FEP, in a thickness of about 3 to 20 N, in particular in the range of 10 N, meets these basically contradictory demands excellently. If sufficiently viscous plastics material is used, a layer thickness of about 1 (~ is even possible. Furthermore, such a hologram can be applied to a substrate either as an adhesive label or by known heat-sealing techniques. If protection from forgery is of less interest the embossed structure can also be incorpo-rated directly into.the protective layer. In this case the further hologram layer can be omitted.
Instead of an embossed hologram one can of course also use other layers with optically variable effects, for example a photographic emulsion layer with a volume hologram, a dif-fraction grid or a layer with interference or color change effects.
To fabricate the compound film material the material is most simply cut into strips and rolled up. These strips or threads are preferably applied to an continuously supplied substrate in a calender-like roller frame.
For label-like holograms of any desired contour the basi-cally known decal technique is applied, i.e. the label con-tour is prepunched into the thin protective film so that the label sticks to the substrate when the carrier film is re-moved.
Due to their mechanical stability under load and their small thickness, the inventive holograms are particularly suitable for equipping papers of value such as bank notes.
Furthermore, the easy handling and inexpensive production of the transfer material are of great importance.
In the following some embodiment examples of the inven-tion shall be described by way of example with reference to the adjoined drawing. in which:
Figs. 1a to c show various production steps for the transfer material, Fig. 2 shows schematically the production of the transfer material of Fig. 1a, and Fig. 3 shows schematically the application of a hologram to an endless paper strip.
The inventive hologram shown in Figs. 1a to 1c comprises a relatively thick, stable carrier film 10. Polyester films are preferably used. The carrier film bears a separation layer 12, for example a wax, that ensures easy removal of carrier film 10 from the rest of the compound material. Adja-cent to separation layer 12 is transparent thin protective film 14 which is preferably made of PC, PVF, PETP, PCTFE or FEP. Such films are known for their excellent mechanical durability and dimensional stability. Protective film 14 bears an embossed layer 16 which consists far example of a known embossable lacquer. The embossed lacquer relief is customarily metalized. The metalizing is suggested in Figs.
1b and 1c by reference number 18.
The reflective metal layer may bear a protective layer 20 which is followed by an adhesive layer 22. Protective layer 20 can also be omitted; under certain circumstances it may suffice for sufficiently thick adhesive layer 22 to lie di-rectly on embossed hologram 18.

i ~,~ . .... .. . .... .t If the adhesive layer is a contact adhesive, i.e, an adhesive that sticks in the cold state, the adhesive layer must be covered with a layer 29 to permit handling of the compound material. Silicone paper has proven particularly useful in this connection. If the layer is a hot-melt adhe-sive, such a paper layer is of course unnecessary since the hot-melt adhesive only develops its adhesive effect at higher temperatures.
Instead of embossed hologram 18 one can also provide a photosensitive layer into which the hologram is incorporated by exposure, i.e. a so-called volume hologram. Such photosen-sitive layers and their treatment axe known; suitable materi-als are photopolymers or fine-grained photographic emulsions.
The volume hologram is covered, not with a metal layer, but with a black backing layer of lacquer. It is also possible to color the already existing adhesive layer 22 black.
The production of a semifinished product according to Fig. 1a is shown schematically in Fig. 2. A separation layer (release layer) made of wax, for example, is applied at 28 to carrier film 10 unrolled from a drum 26. The inventive pro-tective film runs from a film producing or unrolling means 30 to laminating means 32 in which the film is laminated to the carrier film by passing through a roll slit. Embossed layer 16 is then applied in unit 34. The compound material accord-ing to Fig. 1a is finally wound onto drum 36 and subsequently processed in the known way.
The further steps are the embossing of a hologram into embossed layer 16, the vacuum metalizing of embossed layer 1.6 before or after embossing, and then optionally the applica-tion of a protective layer 20. The adhesive, which may be a contact adhesive or a hot-melt adhesive, is then applied to the protective layer. If a contact adhesive is used the com-pound material is covered with silicone paper.
Fig. 3 shows the schematic diagram of an application sys-tem for applying the holograms to an endless paper strip. The film compound materia=~ according to Fig. lc is removed from drum 38, whereby silicone paper 24 is first detached from the compound material via drum 40. The paper to be provided with the hologram is suppl~_ed from drum 42 to a roller frame 44, whereupon the hologram is pressed with contact adhesive layer 22 onto the paper in a roll slit. The paper with the~hologram adhering thereto is wound onto drum 46 while the carrier film is detached from the compound and runs to drum 48. In the case shown a continuous hologram strip or endless thread is transferred to the paper carrier.
It is of course likewise possible to work with the known hot transfer technique, i.e. to design adhesive layer 22 as a heat-sealing layer an~i emboss the hologram on by means of rolls or heated dies. This means that only the adhesive layer located directly below the roll or die softens and adheres to the substrate. Upon removal, all parts of the compound mate-rial are also removed which were located in areas not heated by the die.
When using island7.ike labels it is of course necessary, regardless of the adhesive method used (hot-melt adhesive, contact adhesive, etc..;~, to accordingly prepunch thin pro-tective film 14, which is a tear-resistant, stable material, since it is otherwise impossible to extract the hologram label from the film compound. Preferably, the optically variable elements adhering to the substrate are again pressed on to the sub;~trate over the entire surface and optionally under the action of heat after removal of the non-prepunched areas 7a Further layers ca.n of course also be present in the ele-ment in addition to the described layers, for example to pro-vide protection from forgery. It is also conceivable to pre-treat the paper carrier so as to improve adhesion o~ the smoothness of the transition. Such measures are e.g. the pre-vious application of adhesive layers or bonding agents to the paper, or the preembo;ssing or glazing of the paper in the areas where the hologram is to be disposed:~

Claims (35)

1. A multilayer optically variable transfer material having an adhesive layer (22), at least one layer (16, 18, 20) having the optically variable effect, at least one protective layer (14) and a removable carrier layer (10), characterized in that the protective layer (14) is designed as a self-supporting and dimensionally stable layer having a thickness of from a few micrometers to about 20 µ, and is a plastic film being selected from the group consisting of polycarbonate (PC), polyvinyl fluoride (PVF), polyethylene terephthalate (PETP), polychlorotrifluoroethylene (PCTFE)and tetrafluoroethylene/hexafluoropropylene copolymer (FEP).
2. The optically variable transfer material as defined in claim 1 wherein the optically variable transfer material is a hologram.
3. The optically variable transfer material as defined in claim 1 or 2 wherein the adhesive layer (22) is covered by an easily removable cover layer (24).
4. The optically variable transfer material as defined in any one of claims 1, 2 and 3, characterized in that the layer with the optically variable effect consists of an embossed layer (16), a reflective metal layer (18) and a protective layer (20) that is adjacent to the adhesive layer (22).
5. The optically variable transfer material as defined in any one of claims 1, 2 and 3, characterized in that the layer with the optically variable effect consists of a photosensitive layer with a volume hologram and further consisting of a black backing layer covering the photosensitive layer and adjacent to the adhesive layer (22), the photosensitive layer being selected from the group consisting of a photosensitive emulsion and a photosensitive polymer.
6. The optically variable transfer material of claim 5, characterized in that the black backing layer is formed of the adhesive layer (22).
7. The optically variable transfer element as defined in any one of claims 1 to 6, characterized in that the adhesive layer (22) is a layer of hot-melt adhesive.
8. The optically variable transfer material as defined in any one of claims 1 to 6, characterized in that the adhesive layer (22) is a layer of contact adhesive.
9. The optically variable transfer material as defined in any one of claims 1 to 8, characterized in that contours of an element to be transferred to a substrate are punched out or prepunched in the protective layer (14).
10. The optically variable transfer material as defined in any one of claims 1 to 8, characterized in that it is present in the form of one selected from the group of an endless, reelable thread and an endless reelable strip.
11. A substrate with the optically variable transfer material as defined in any one of claims 1 to 10 glued thereto.
12. The substrate of claim 11, characterized in that it is a paper of value.
13. The substrate of claim 12, characterized in that the paper of value is a bank note.
14. The substrate of claim 12 or 13, characterized in that the optically variable transfer material is glued to the paper of value in the form of a thread running from edge to edge.
15. A method for producing an optically variable transfer material, characterized by the following steps:
a) applying a separation layer (12)to a long-wearing and machinable carrier film (10), b) applying a transparent, self-supporting, dimensionally stable protective film (14) with a thickness of from a few micrometers to about 20 µ to the separation layer (12), the protective film (14) consisting of a plastic film being selected from the group consisting of polycarbonate (PC), polyvinyl fluoride (PVF), polyethylene terephthalate (PETP), polychlorotrifluoroethylene (PCTFE) and tetrafluoroethylene/hexafluoropropylene copolymer (FEP), c) coating the film (14) with an embossable layer of lacquer (16), d) embossing a hologram into the layer of lacquer, e) metalizing the embossed layer of lacquer with a thin reflective metal layer (18), f) applying a protective layer (20) covering the metal layer (18), and g) applying an adhesive layer (22).
16. A method for producing an optically variable transfer material, characterized by the following steps:
a) applying a separation layer (12) to a long-wearing and machinable carrier file (10), b) applying a transparent, self-supporting, dimensionally stable protective film (14) with a thickness of from a few micrometers to about 20 µ to the separation layer (12), the protective film (14) consisting of a plastic film being selected from the group consisting of polycarbonate (PC), polyvinyl fluoride (PVF), polyethylene terephthalate (PETP), polychlorotrifluoroethylene (PCTFE) and tetrafluoroethylene/hexafluoropropylene copolymer (FEP), c) coating the film (14) with one selected from the group consisting of a photographic emulsion and a photopolymer, d) incorporating a volume hologram into the one selected from the group consisting of the emulsion and the photopolymer by appropriate exposure steps, e) covering the one selected from the group consisting of the emulsion and the polymer with a black backing layer, and f) applying an adhesive layer (22).
17. The method as defined in claim 15 wherein the optically variable transfer material is a hologram.
18. The method as defined in claim 15 or 17, characterized in that the separation layer (12) is a detachable adhesive layer.
19. The method as defined in any one of claims 15, 17 and 18, characterized in applying a detachable protective layer (24).
20. The method as defined in claim 16, characterized in that the optically variable transfer material is a hologram.
21. The method as defined in claim 16 or 20, characterized in that the separation layer (12) is a detachable adhesive layer.
22. The method as defined in any one of claims 16, 20 and 21, characterized in applying a detachable protective layer (24).
23. The method as defined in any one of claims 16 and 20 to 22, characterized in that the adhesive layer is colored black.
24. The method as defined in any one of claims 15 to 23, characterized in that the adhesive layer (22) consists of contact adhesive that is covered by an easily removable cover layer (24).
25. The method as defined in claim 24 characterized in that the easily removable cover layer (24) is silicone paper.
26. The method as defined in any one of claims 15 to 25, characterized in that contours of an element to be transferred to a substrate are prepunches in the protective film (14).
27. The method as defined in any one of claims 15 to 23 and 25, characterized in that the adhesive layer (22) comprises a hot-melt adhesive.
28. The method of any one of claims 15, 16, 23, 24, 26 and 27, characterized in that the optically variable transfer material is cut into narrow endless threads and wound up.
29. A method for applying an optically variable element using the transfer material of claim 10 to a substrate, characterized in that the one selected from the group consisting of the thread and the strip is wound off a supply reel (38), the one selected from the group consisting of the thread and the strip is brought together in a roll slit with a substrate, the one selected from the group consisting of the thread and the strip sticks with its adhesive layer to the substrate, and the carrier film (10) is simultaneously removed from the one selected from the group consisting of the thread and the strip upon leaving the roll slit.
30. A method for applying an optically variable element using the transfer material of claim 9 to a substrate, characterized in that the substrate and a flat piece of the optically variable transfer material with the prepunched area are placed together, the prepunched contour is subjected to a die, and the flat piece is removed from the substrate, the prepunched area of the transfer material sticking to the substrate as an optically variable element.
31. The method as defined in claim 30, characterized in that the die is heated.
32. The method of claim 30 or 31, characterized in that the optically variable element adhering to the substrate is again pressed onto the substrate over the entire surface.
33. The method as defined in claim 24,characterized in that the easily removable cover layer (24) is removed.
34. The method as defined in claim 29 or 33, characterized in that the substrate is a continuously supplied paper of value.
35. The method as defined in claim 32, characterized in that the optically variable element adhering to the substrate is pressed onto the substrate under the action of heat after removal of the non-prepunched areas.
CA002046711A 1990-07-10 1991-07-10 Multilayer optically variable element Expired - Lifetime CA2046711C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4021908.9 1990-07-10
DE4021908A DE4021908C2 (en) 1990-07-10 1990-07-10 Process for producing a substrate with an optically variable element and use of the substrate

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CA2046711A1 CA2046711A1 (en) 1992-01-11
CA2046711C true CA2046711C (en) 2002-04-09

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JP (1) JPH04331972A (en)
AT (1) ATE129081T1 (en)
AU (1) AU642030B2 (en)
CA (1) CA2046711C (en)
DE (2) DE4021908C2 (en)
ES (1) ES2077728T5 (en)

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EP0466118B1 (en) 1995-10-11
ATE129081T1 (en) 1995-10-15
AU8028891A (en) 1992-01-16
DE4021908C2 (en) 2002-04-25
AU642030B2 (en) 1993-10-07
DE4021908A1 (en) 1992-01-16
CA2046711A1 (en) 1992-01-11
ES2077728T3 (en) 1995-12-01
EP0466118B2 (en) 2001-04-25
JPH04331972A (en) 1992-11-19
DE59106649D1 (en) 1995-11-16
EP0466118A2 (en) 1992-01-15
EP0466118A3 (en) 1993-01-13
ES2077728T5 (en) 2001-06-16

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