AU642030B2 - A multilayer optically variable element - Google Patents

A multilayer optically variable element Download PDF

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Publication number
AU642030B2
AU642030B2 AU80288/91A AU8028891A AU642030B2 AU 642030 B2 AU642030 B2 AU 642030B2 AU 80288/91 A AU80288/91 A AU 80288/91A AU 8028891 A AU8028891 A AU 8028891A AU 642030 B2 AU642030 B2 AU 642030B2
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Australia
Prior art keywords
layer
optically variable
variable element
substrate
adhesive layer
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AU80288/91A
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AU8028891A (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

Landscapes

  • 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)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

In the case of a multilayered optically variable element, preferably a hologram, having an adhesive layer which is covered by an easily removable top layer and at least one layer which has the optically variable effect, the protective layer is designed as a self-supporting and dimensionally stable layer of a thickness of a few micrometres. <IMAGE>

Description

1- P/00/011 Regulation 3.2
AUSTRALIA
Patents Act 1990 4203 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
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Name of Applicant: Actual Inventor(s): Address for Service: Invention Title: GAO Geseilschaft ffir Automation und Organisation mbH Wittich Kaule GRIFFITH HACK CO 71 YORK STREET SYDNEY NSW 2000 A MULTILAYER OPTICALLY VARIABLE ELEMENT The following statement is a full d'iscription of this invention, including the best method of performing it known to us: GH&CO REF: 21530-B:CLC:RK 9077A:rk r e 4
IA
A multilayer optically variable element The present invention relates to a multilayer optically variable element, preferably a hologram, a1 1 d It also relates to a substrate equipped with the optically variable element and to a method for producing the optically variable element.
Optically variable elements are primarily understood to be holograms and diffraction grids, but they may also be other elements having an optically visible effect that 0. changes in accordance with the viewing angle and/or irradi- 0 ated wavelength due to characteristic interference effects, reflection, transmission, absorption and other properties.
Holograms are customarily produced in the form of sheetlike 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- S:"o quer disposed on the substrate. The holograms are hardened after embossing by exposure to UV light or electron beams.
got 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-resistant, i.e. virtually undetachable from the carrier. Furthermore, they must withstand considerable mechanical stresses over a long time without showing any noticeable changes.
Holograms consisting of plastic films affixed to a substrate with a contact adhesive have relatively high stability, i.e. they are most suitable for withstanding the mechanical stresses that arise. A disadvantage, however, is their thickness and the resulting rigidity, that makes it impossible to employ such adhesive labels for protecting bank notes, Sfor example.
2 Holograms that are embossed into a thin layer of lacquer disposed on the substrate can be used in many ways, for example 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.
DE-OS 33 08 831 discloses a hologram that can be applied to a substrate by the transfer method. To permit better handling of the relatively thin hologram it is connected by a separation layer with a relatively stable carrier film that G can be removed after the hologram has been applied to the substrate. This technique permits the application of relatively thin-layer hologram\5 that can hardly be handled as such due to their low dimensional stability and rigidity.
~This property is utilized to rule out a subsequent detachment o" 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 in a Gose roll slit.
osoo 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 compound material is pressed against the substrate. After the So 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 detachment. This thermoplastic protective layer 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 substrate, 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 hologram protected with such a layer does not withstand mechani- 3 cal and chemical environmental influences for any length of time.
The present invention is based on the problem of providing an optically variable element that has minimal thickness while being maximally resistant to environmental influences, ie. 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.
According to the present invention there is provided a multilayer optically variable element, having an adhesive layer, at least one layer having an optically variable effect, a protective layer and a removable carrier layer wherein the protective layer is designed as a self-supporting and dimensionally stable layer having a thickness of from a few micrometers to 20 A.
The invention is based on the finding that the hologram can in fact be mechanically unstable for 20 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 thickness. A particularly suitable film has proven to be one made of 25 PC, PVF, PETP, PCTFE or FEP with a thickness of from a few micrometers to about 20 A, in particular in the range of 10 j. 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 removed after the 30 hologram has been applied to the substrate.
Goes When holograms are applied the contour of the *0 particular plane element is prepunched in the thin 0. protective film, so that it is readily possible to detach or extract the hologram from the surrounding material.
Replacing the known unstable layer by an equally thin but extremely resistant film, for example of polycarbonate polyvinyl fluoride (PVF), S' Apolyethylene terephthalate (PETP) 3A polychlorotrifluoroethylene (PCTFE tetrafluoroethylene/hexafluoropropylene copolymer (PEP), together with the mea.sure of prepunching the hologram contours, results in a boo- V to.* toS **s .1 to 0: S.21 530B/700
I
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 security aspects the layer supporting the hologram should be dimensioned without any great inherent strength, while the protective film should be selected in terms of thickness and material 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 i o• O. *o film of PC, PVF, PETP, PCTFE or FEP, in a thickness of about 3 to 20 p, in particular in the range of 10 p, meets these basically contradictory demands excellently. If sufficiently 00 viscous plastics material is used, a layer thickness of about 0000 1 p 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 incorporated 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 diffraction 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 basically known decal technique is applied, i.e. the label contour is prepunched into the thin protective film so that the label sticks to the substrate when the carrier film is removed.
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 invention shall be described by way of example with reference to the adjoined drawing, in which: Figs. la to c show various production steps for the e transfer material, Fig. 2 shows schematically the production of the transfer 0e material of Fig. la, and *.ge Fig. 3 shows schematically the application of a hologram to an endless paper strip.
*The inventive hologram shown in Figs. la to Ic 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 too carrier film 10 from the rest of the compound material. Adjacent to separation layer 12 is transparent thin protective film 14 which is preferably made of PC, PVF, PETP, PCTFE or r* FEP. Such films are known for their excellent mechanical durability and dimensional stability. Protective film 14 bears an embossed layer 16 which consists for example of a known embossable lacquer. The embossed lacquer relief is customarily metalized. The metalizing is suggested in Figs.
Ib and Ic by reference number 18.
The reflective metal layer may bear a protective layer which is followed by an adhesive layer 52. Protective layer can also be omitted; under certain circumstances it may suffice for sufficiently thick adhesive layer 22 to lie directly on embossed hologram 18.
L
6 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 24 to permit handling of the compound material. Silicone paper has proven particularly useful in this connection. If the layer is a hot-melt adhesive, 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 al?-o provide a photosensitive layer into which the hologram is incorporated 0. 4 by exposure, i.e. a so-called volume hologram. Such photosensitive layers and their treatment are known; suitable materials 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.
i -The production of a semifinished product according to Fig. la 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 protective film runs from a film producing or unrolling means 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 according to Fig. la 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 16 before or after embossing, and then optionally the application 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 compound material is covered with silicone paper.
Fig, 3 shows the schematic diagram of an application sys-
J
7 tem for applying the holograms to an endless paper strip. The film compound material according to Fig. Ic 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 supplied 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.
4 O 0O 0.0It is of course likewise possible to work with the known Shot transfer technique, i.e. to design adhesive layer 22 as a heat-sealing layer and emboss the hologram on by means of *c 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 material are also removed which were located in areas not heated by the die.
00 When using islandlike labels it is of course necessary, regardless of the adhesive method used (hot-melt adhesive, contact adhesive, itc.), to accordingly prepunch thir protective film 14, which is a tear-resistant, stable material, since it is otherwise impossible to extract the hologram label from the film compound.
Further layers can of course also be presen. in the element in addition to the described layers, for example to provide protection from forgery. It is also conceivable to pretreat the paper carrier so as to improve adhesion or the smoothness of the transition. Such measures are e.g. the previous application of adhesive layers or bonding agents to the paper, or the preembossing or glazing of the paper in the areas where the hologram is to be disposed-.-

Claims (21)

1. A multilayer optically variable element, having an adhesive layer, at least one layer having an optically variable effect, a protective layer and a removable carrier layer wherein the protective layer is designed as a self-supporting and dimensionally stable layer having a thickness of from a few micrometers to 20 p.
2. The optically variable element of claim 1, characterised in that the protective layer is a plastic film, preferably made of polycarbonate polyvinyl fluoride (PVF), polyethylene terephthalate (PETP), polychlorotrifluoroethylene (PCTFE) or tetrafluoroethylene/hexafluoropropylene copolymer (FEP).
3. The optically variable element of claim 1 or 2, characterised in that the layer with the optically variable effect consists of an embossed layer, a reflective metal layer and a protective layer that is adjacent to the outer adhesive layer.
4. The optically variable element of claim 1 or 2, 20 characterised in that the layer with the optically variable effect consists of a photosensitive emulsion or a photosensitive polymer with a volume hologram and a black backing layer covering the photosensitive layer and adjacent to the adhesive layer. 25 5. The optically variable element of claim 4, characterised in that the black backing layer is formed of the black coloured adhesive layer. S
6. The optically variable element of any one of "claims 1 to 5, characterised in that the adhesive layer e S:215308/700 is a layer of hot-melt adhesive.
7. The optically variable element ofa~a3e one of claims 1 to 5, characterized in that the adhesive layer is a layer of contact adhesive.
8. The optically variable element ofAt=&at one of claims 1 to 7, characterized in that the contours of the element to be transferred to a substrate are punched out or prepunched in the protective layer S* S. 9. The optically variable element of 4 *eat one of 0 claims 1 to 7, characterized in that it is present in the 6 e form of an endless, reelable thread or strip.
10. A substrate with the optically variable element of any of claims 1 to 9 glued thereto.
11. The substrate of claim 10, characterized in that it is a paper of value, preferably a bank note. oo*«
12. The substrate of claim 11, characterized in that the optically variable element is glued to the paper of value in the form of a thread running from edge to edge.
13. A method for producing an optically variable element, preferably a hologram, characterized by the following steps: a) applying a separation layer (detachable adhesive layer) to a long-wearing and machinable carrier film b) applying a transparent, self-supporting, dimensionally stable protective film with a thickness of from a few micrometers to about 20 p to the separation layer c) coating the compound material with an embossable layer A of lacquer d) embossing a hologram into the layer of lacquer, e) metalizing the embossed layer of lacquer with a thin reflective metal layer f) applying a protective layer covering the metal layer (18), g) applying an adhesive layer and optionally o f) applying a detachable protective layer
14. A method for producing an optically variable element, 0 preferably a hologram, characterized by the following steps: a) applying a separation layer (detachable adhesive layer) to a long-wearing and machinable carrier film b) applying a transparent, self-supporting, dimensionally stable protective film with a thickness of from a few micrometers to about 20 p to the. separation layer c) coating the compound material with a photographic emulsion or a photopolymer, d) incorporating a volume hologram into the emulsion or the photopolymer by appropriate exposure steps, e) covering the emulsion or the polymer with a black backing layer, f) applying an adhesive layer and optionally g) applying a detachable protective layer The method of claim 14, characterized in that the adhesive layer is colored black. 11
16. The method of claims 13 to 15, characterised in that the adhesive layer comprises of contact adhesive that is covered by an easily removable cover layer.
17. The method of any of claims 13 to 16, characterised in that the contours of the element to be .ransferred to a substrate are prepunched in the protective film.
18. The method of any of claims 13 to characteriset in that the adhesive layer comprises a hot- melt adhesive.
19. The method of at least one of claims 13 to 18, characterised in that the compound material is cut into narrow endless threads and wound up. A method of applying the optically variable element of claim 9 to a substrate, characterised in that the thread or strip is wound off a supply reel, the easily removable cover layer is removed and the threads or strips are brought together in a roll slit with a substrate, the threads or strips stick with their adhesive layer to the paper of value, and the carrier filin is simultaneously removed from the threads or strips upon leaving the roll slit.
21. A method of applying the optically variable element of claim 8 to a substrate, characterised in that 25 the substrate and a flat piece of the optically variable element with the prepunched area are placed together, and the flat piece is removed from the substrate, the prepunched area of the optic:lly variable element sticking to the substrate. 30 22. The method of claim 21, characterised in that the optically variable elements adhering to the substrate o. are again pressed onto the substrate over the entire surface.
23. A method as claimed in claim 20 wherein the substrate is a continuously supplied paper.
24. A method as claimed in claim 21 wherein the prepunched contour is subjected to a heated die. 1530B/700 12 A method as claimed in claim 21 wherein the optically variable'elements adhering to the substrate are again pressed onto the substrate over the entire surface under the action of heat after removal of the non- prepunched areas.
26. A multilayer optically variable element as claimed in claim 1 wherein the adhesive layer is covered by an easily removable cover layer.
27. A multilayer opticall' variable element hereinbefore described with reference to the accompanying drawings. DATED this 26th day of July 1993 GAO GESELLSCHAFT FUR AUTOMATION UND ORGANISATION MBH By their Patent Attorneys GRIFFITH HACK CO. 0* 0* IS. o g 1530B/700 1 I 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 Sthickness. of a few micrometers. 4 *4 0 0o 0,00 •4 0 40
AU80288/91A 1990-07-10 1991-07-08 A multilayer optically variable element Ceased AU642030B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4021908A DE4021908C2 (en) 1990-07-10 1990-07-10 Process for producing a substrate with an optically variable element and use of the substrate
DE4021908 1990-07-10

Publications (2)

Publication Number Publication Date
AU8028891A AU8028891A (en) 1992-01-16
AU642030B2 true AU642030B2 (en) 1993-10-07

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AU80288/91A Ceased AU642030B2 (en) 1990-07-10 1991-07-08 A multilayer optically variable element

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EP (1) EP0466118B2 (en)
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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DE59106649D1 (en) 1995-11-16
ES2077728T3 (en) 1995-12-01
CA2046711C (en) 2002-04-09
EP0466118B2 (en) 2001-04-25
JPH04331972A (en) 1992-11-19
DE4021908A1 (en) 1992-01-16
ES2077728T5 (en) 2001-06-16
EP0466118B1 (en) 1995-10-11
EP0466118A2 (en) 1992-01-15
AU8028891A (en) 1992-01-16
CA2046711A1 (en) 1992-01-11
DE4021908C2 (en) 2002-04-25
ATE129081T1 (en) 1995-10-15
EP0466118A3 (en) 1993-01-13

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