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WO1993005124A1 - Adhesif pour dispositif de securite a couche mince - Google Patents

Adhesif pour dispositif de securite a couche mince Download PDF

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Publication number
WO1993005124A1
WO1993005124A1 PCT/CA1992/000110 CA9200110W WO9305124A1 WO 1993005124 A1 WO1993005124 A1 WO 1993005124A1 CA 9200110 W CA9200110 W CA 9200110W WO 9305124 A1 WO9305124 A1 WO 9305124A1
Authority
WO
WIPO (PCT)
Prior art keywords
ultraviolet radiation
sensitive adhesive
substrate
pressure sensitive
adhesive
Prior art date
Application number
PCT/CA1992/000110
Other languages
English (en)
Inventor
Alice Hibbert Pincus
Original Assignee
Bank Of Canada
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bank Of Canada filed Critical Bank Of Canada
Publication of WO1993005124A1 publication Critical patent/WO1993005124A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
    • C09J167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
    • C09J167/07—Unsaturated polyesters having carbon-to-carbon unsaturation having terminal carbon-to-carbon unsaturated bonds
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/28—Non-macromolecular organic substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
    • C08L2666/54—Inorganic substances

Definitions

  • the present invention relates to a combination of components to obtain a printable pigmented temporary pressure sensitive UV curable adhesive. More particularly, the present invention relates to formulations which can be printed as an ink, then become pressure sensitive adhesives upon exposure to ultraviolet light, attaining a high tack state for transferring dielectric material thereto, and within hours permanently bonds to the dielectric material to form a thin film security device (TFSD) .
  • TFSD thin film security device
  • the application of dielectric material to valuable, documents has been found to provide excellent security devices.
  • the dielectric material is applied in a thin layer to the document by either a conventional labelling technique or a hot foil stamping technique.
  • the present invention provides a unique pressure sensitive adhesive which permanently bonds a dielectric material in an uncomplicated room temperature conventional labelling technique to provide a thin film security device of minimum thickness.
  • a printable ultraviolet radiation curable pressure sensitive adhesive composition which comprises:
  • the present invention also provides a printable pigmented ultraviolet radiation curable pressure sensitive adhesive composition which comprises: (a) at least one saturated copolyester with some terminal acrylic double bonds;
  • the adhesive composition of this invention has the following properties:
  • the above-described adhesive composition is printable by an offset gravure process and has a viscosity near 20 poise at 25 degrees Centigrade.
  • the dry film has an optical density greater than 1.4.
  • the present invention further provides an article of manufacture comprising: a substrate, to selected areas on the surface of said substrate is permanently bonded a semi-transparent dielectric material, said bonding being by means of the ultraviolet radiation-curable pressure-sensitive adhesive having the constitution and characteristics as set forth hereinabove.
  • the present invention still further provides an article of manufacture which comprises a pattern of patches of semi-transparent dielectric materials and/or a very thin layer of metal, permanently bonded to banknote paper by means of a black UV radiation curable pressure sensitive adhesive having the constitution and characteristics as set forth hereinabove.
  • the ultraviolet radiation-curable pressure-sensitive adhesive which comprises one aspect of the present invention comprises the following components:
  • polyesters that known under the tradename of "Dynacoll A lr , the exact composition of which is not known to the applicant; they are in the form of viscous liquids.
  • Specific polyesters which have been found particularly useful in the present invention are those designated by the tradenames "Dynacoll A 3130", “Dynacoll A 3170” and “Dynacoll A 3251”.
  • a carbon black pigment which is dispersed in an acrylate monomer More specifically the carbon black pigment dispersion which has been found particularly effective is one known under the tradename "Pennco 9B1" which is a dispersion of carbon black pigments in trimethylolpropane triacrylate (TMPTA) at approximately 20% by weight pigment concentration.
  • Pennco 9B1 is a dispersion of carbon black pigments in trimethylolpropane triacrylate (TMPTA) at approximately 20% by weight pigment concentration.
  • One or more vinyl ether monomers such as for example 4 - h yd ro xybuty 1v iny 1 ether (HBVE) , cyclohexylvinylether (CHVE) , and triethyleneglycol divinylether (DVE-3) , or oligomers thereof, or blends of the aforesaid vinyl ether monomers and oligomers.
  • HBVE h yd ro xybuty 1v iny 1 ether
  • CHVE cyclohexylvinylether
  • DVE-3 triethyleneglycol divinylether
  • Free radical photoinitiators which have been found to be effective are acetophenone derivatives such as 2-hydroxy-2-methyl-l-phenylpropan-l- one known by the tradename of "Darocur 1173", or diethoxy acetophenone, or a blend of the first-mentioned acetophenone derivatives with a thioxanthone and an amine benzoate, known under the tradename of "Darocur 4043”; or an acetophenone derivative having also amine functionality, specifically the compound 2-benzyl-2- (dimethylamino) -1- [4- (4-morpholinyl)phenyl]-1-butanone, known under the tradename of "Irgacure 369".
  • acetophenone derivatives such as 2-hydroxy-2-methyl-l-phenylpropan-l- one known by the tradename of "Darocur 1173", or diethoxy acetophenone, or a blend of the first-mentioned aceto
  • Cationic photoinitiators which have been found to be effective are triaryl sulfonium salts of hexafluorophosphate, known by the tradenames "FX 512" and “Cyracure UVI 6990", and of hexafluoroantimonate, known by the tradename "Cyracure UVI 6974".
  • a cationic photoinitiator is not essential if an amine functionality is present in the free radical photoinitiator combination.
  • the acrylated copolyester To prepare the adhesive, the acrylated copolyester must be heated to allow dispensing into a tared container. Either the pigment dispersion or the vinyl ether or both are then added and blended, heating to 50°C as necessary to facilitate mixing. The rest of the ingredients can be added and mixed in at room temperature. The mixing may be effected by any suitable means known in the art.
  • the pressure-sensitive adhesive as described above is storage stable (ie. has a shelf life of at least 2 years.)
  • the pressure-sensitive adhesive is obtained by UV curing of saturated copolyesters with some terminal acrylic double bonds and hydroxyl functionality, viz., component (a) of the foregoing composition; and it is the addition of vinyl ether monomers that cause further reaction with the adhesive to render it dry and permanent.
  • the "Dynacoll A" polyesters are designed to be applied to a substrate by hot melt apparatus, and upon cure to form permanently tacky films.
  • the applicant has found that the addition of the vinyl ether monomer (component (b) ) to the saturated copolyester serves to dilute the copolyester adhesive so as to provide an adhesive viscosity low enough for printing application to banknote paper as described hereinafter while at the same time ensuring that sufficiently high tack is developed for the transfer step.
  • the vinyl ether reacts with residual reactive groups of the copolyester to form a dry and durable film.
  • the composition must be printable. This places limits on the viscosity of the composition. If the formulation is too fluid, it will be absorbed by the paper substrate. If the formulation is too viscous, it will not print cleanly, resulting in poor line resolution and scumming in non-image areas.
  • the "Dynacoll" oligomers must be diluted with monomer(s) to reduce their viscosity to make them printable. Monomers differ in their efficiency as diluents. The ratio of oligomer(s)to monomer(s) is targeted to obtaining the optimum application viscosity.
  • the composition must cure upon exposure to UV radiation ( 2 x 300 watts per inch) at 200 feet per minute. Cure speed is a function of formulation components, application thickness and UV intensity.
  • cure speed is dependent on the photoinitiator type and level, the colour, and the chemical structure of the oligomers and monomers.
  • the formulation is black and the level of black pigment is determined by the desired optical density of the cured adhesive. If less black pigment is used, the optical density would be too low. The more black pigment which is used, the slower the cure speed.
  • the "Dynacoll" oligomers are not high speed curing materials. In order to achieve the desired cure speed, fast photoinitiators and/or fast curing monomers must be used. However, the fastest free radical curing monomers tend to produce harder polymers, which means, less tacky surfaces. We have therefore endeavoured to optimize the level of TMPTA (trimethylolpropane triacrylate) in order to balance cure speed with tack.
  • TMPTA trimethylolpropane triacrylate
  • the composition must be a temporary pressure sensitive adhesive to allow transfer of TFSM and then permanently bond the TFSM to banknotes.
  • This requirement is met by a dual cure UV system.
  • the free radical cure of "Dynacoll" oligomers results in a pressure sensitive adhesive.
  • Postcuring presumably by cationic cure, hardens the adhesive to yield a non- tacky, scratch resistant, durable product.
  • the types and levels of monomer greatly affect the performance of the dual cure system.
  • the type and level of photoinitiator plays an even greater role in overall performance. We have found that the dual cure is obtainable with a combination of free radical and cationic photoinitiators, but that the free radical photoinitiator has a greater effect.
  • amine functional free radical photoinitiators eliminates the need for a cationic photoinitiator. Too much photoinitiator results in a drier initial surface than desired (poor transfer) and can result in a surface cure that prevents light penetration to the interlayer between the surface and the substrate (wetback on transfer film) . Too little photoinitiator results in insufficient cure.
  • the UV radiation-curable pressure-sensitive adhesive of the present invention has the following properties:
  • Io is the intensity of incident light I
  • I is the intensity of the reflected light.
  • the viscosity of the adhesive in its non-activated state ranges from about 3500-5200 cps. at 20°C.
  • the thin film security device (TFSD) to which reference has been made earlier in this specification is a reflective surface which switches colour when a viewer observes it from different angles. Bank notes with the TFSD are easily identified as genuine but difficult to counterfeit.
  • the TFSD optical coating material is supplied as a very thin releasable layer deposited on a plastic carrier ribbon.
  • the above-described adhesive is used to secure the coating to banknotes in the following manner: A motif (patch) in adhesive ink, approximately 10 mm by 12 mm, is printed over the lithographic background on the face of each banknote. Each note is then exposed to ultra-violet light to begin curing of the adhesive.
  • the plastic carrier ribbon is then forced into contact with the printed adhesive motif as it cures. This application, under appropriate pressure, ensures the instant formation of a positive bond between all three elements: the optical coating, the adhesive, and the banknote. Separation of the plastic ribbon from the banknote releases a portion of the TFSD optical coating onto the banknote surface in the exact image of the printed motif.
  • Figure 1 is a schematic drawing of the laminate and substrate before application.
  • Figure 2 is a schematic drawing of the laminate and substrate after application.
  • Figure 3 is a plan view of a sheet of banknote paper to which an array of patches of UV radiation curable printable pressure-sensitive adhesive according to the present invention has been applied.
  • the adhesive (4) is applied to a substrate or a document (5) by an offset gravure printing process or other similar printing application.
  • the adhesive (4) is applied in patches on the document (5) in the shape of the final transferred thin film security device.
  • the substrate or document (5) is preferably banknote paper, but may be other suitable paper carriers which, if desired, could be calendered or plastic coated.
  • Figure 3 illustrates a typical array of patches of the adhesive applied to a sheet of banknote paper.
  • the polymerization of the adhesive advances it to a tacky state.
  • the adhesive is able to attain a highly tacky state by the action of ultraviolet radiation in less than 1 second after treatment.
  • the thin film of transparent dielectric material is brought into contact with the adhesive.
  • the dielectric material is one of three layers of a laminate.
  • the three layers of the laminate are: - a polyester film of a thickness of 12-25 ⁇ m (1) ;
  • the polyester film is comprised of polyethylene terephthalate, a readily available material sold under such trade designations as "Mylar llR , "Hostaphan”TM and “Melinex”TM.
  • the release coating may be of any suitable release material known in the art. A suitable thickness of the release coating is about 5 micrometres.
  • the dielectric material layers (3) are made up of five layers, the outermost layers of which are of zirconia (Zr0 2 ) , a central layer also of zirconia, and sandwiched between the outer and innermost zirconia layers are two layers of silica, the total thickness of the combined layers of dielectric material being about 0.8 microns.
  • the dielectric material may be comprised of outer layers of metal, between which is a layer of silica (Si0 2 ) •
  • a layer of silica Si0 2
  • One of the metal layers is of aluminum, and the other is "Inconel” (trademark) , a nickel based, heat- and oxidation-resistant alloy with approximately 13% chromium, 6% iron, and small amounts of manganese, silicon and/or copper.
  • the five-layer thin film stack is deposited on a polyethylene terephthalate web (380 mm wide, 0.025 mm thick and 1700 metres long) , in a vacuum roll coater manufactured by Ulvac Japan.
  • Zirconia and silica are heated by electron beams of approximately 20 KW power.
  • the deposition thickness is controlled by varying the speed at which material is moved under the electron beam, the beam current, and the sweep patterns of the electron beams.
  • Zirconia and silica are deposited in a single pass of the web through the two deposition chambers in the roll coater.
  • Patent No. 3,858,977 dated January 7, 1975, and in the paper entitled "Optically Variable Devices for Use on Bank Notes", by J. Rolfe, Proceedings of the International Society for Optical Engineering, SPIE, Vol. 1210, January, 1990, incorporated herein by reference.
  • the transfer process which takes place at room temperature, brings the dielectric material (3) on the outer surface of the laminate material into pressurized contact with the adhesive patches (4) on the paper.
  • the high tack adhesive (4) is of sufficient strength to exceed the combined release coat (2) holding strength and the dielectric material (3) shear strength.
  • the shape of the thin film security device will shear out of the stack material around the edges of the adhesive patches (4) , leaving the dielectric patch bonded to the paper, with part of the release coat (2) as the exposed surface.
  • a final bond strength is obtained in less than 200 hours after pressurized transfer at 40 psi for 250 milliseconds.
  • the pressurized transfer can be done with transfer pads on a Thin Film Application and Conversion System (TACS) .
  • TACS Thin Film Application and Conversion System
  • the Thin Film Application and Conversion System is a horizontal process machine where stacked bank note sheets are fed in one end and move on a flat horizontal path through each of the process sections to exit in stacked format at the opposite end.
  • the sheet feeder is a 5000 sheet capacity unit manufactured by Autofeeds London Ltd. , London, England. The sheets are stacked with the longitudinal axis of the individual bank notes parallel to the process axis of the machine.
  • Sheets are stream fed in shingled fashion with the trailing edge of each sheet overlapping the leading edge of the following sheet. Sheets are guided against a side lay on the feed board by skewed tapes and fed to a registration stop for transfer to the sheet transport system.
  • the sheet transport system consists of an endless dual chain and sprocket system equipped with mechanical grippers running in a horizontal track mounted below the top surface of a transport table.
  • the bank note sheets are held by the same grippers throughout the application process and move in a "web like" stream with a 6 inch (152 mm) longitudinal pitch spacing between individual bank notes, maintained from sheet to sheet by overlapping leading and trailing edges in shingled fashion. The double thickness caused by this overlapping is accommodated by the resilience of the printing and application rollers.
  • the printing system uses a gravure offset process to deposit a measured portion of the above-described printable adhesive as a small printed motif on the surface of each bank note.
  • the etched gravure cylinder is charged with ink using a double doctor blade and ink well system manufactured by Inta Roto Co.
  • the gravure cylinder transfers the adhesive ink to a relieved rubber offset cylinder.
  • the offset cylinder deposits the ink directly onto the note sheet as the sheet passes horizontally beneath it through the nip created with the matching impression cylinder mounted beneath the transport table.
  • the offset and impression rollers are relieved to permit passage of the transport system grippers.
  • the UV curing stage is manufactured by Fusion UV Curing System, Rockville, Maryland, USA.
  • the bank note sheets are passed beneath the curing unit and exit to the TFSM application stage.
  • the adhesive begins curing on exposure to ultra ⁇ violet (UV) light.
  • the curing time is a function of the duration of the exposure and the intensity of the light source.
  • Exposure to UV radiation takes place after printing and prior to the arrival of the bank note sheets at the application process.
  • the curing system initiates a photochemical polymerization of the adhesive ink which changes in fractions of a second from a liquid to a highly tacky adhesive.
  • the thin film security material (TFSM) i.e. the laminate as previously described, is applied to the bank note sheets while the adhesive is tacky, and it bonds instantly to form TFSDs.
  • the adhesive dries as the bank note sheets travel to the PAS delivery system.
  • the ultraviolet radiation is provided by ultraviolet lamps having an output power rating of a minimum of 600 watts per inch transverse to the path of travel of the bank note sheets through the TACS. Suitable lamps for this purpose are two banks of Fusion Systems Corp. "D" lamps or equivalent.
  • the application stage consists of a plurality of disc shaped rotary application units stacked side by side across the width of the transport table.
  • the outside circumference of each rotary application unit is contoured with raised pressure points similar to gear teeth.
  • the pitch of the pressure points matches the longitudinal pitch spacing of the individual notes on each sheet (6 in.).
  • the application units are matched to an impression cylinder beneath the transport table which creates a nip to provide the required application pressure.
  • the ribbons of TFSM are contained in a plurality of cassette type storage and handling units which are individually mounted within each application unit. As the application units rotate in synchronization with the velocity of the bank note sheets moving on the transport table, the ribbons wind in and out of each cassette while being drawn on a circular path covering the pressure points around the circumference of each application unit.
  • the indexing action of each application unit moves a fresh portion of TFSM ribbon over each pressure point as that particular point rotates into contact with an adhesive motif on the bank note sheets passing through the nip.
  • the TACS forces the laminate or thin film security material (TFSM) ribbon into direct contact with the adhesive motif with sufficient force to cause a complete transfer of the TFSM material to the bank note surface, separates the TFSM ribbon from the surface, and indexes the ribbon to the next section of coating for application.
  • the application device applies a contact force equivalent to the force produced by rolling line contact, the contact force being adjustable in a range of 100 to 1000 N with a mean operating force of 200 N, such as to provide optimum control of adhesive deposition and image density.
  • the transport system delivers the bank note sheets to a stacker unit which is also manufactured by Autofeeds London Ltd. The stacker piles the sheets in stacks of up to 5000 sheets.
  • the patches of permanently bonded dielectric material provide a security device for which tampering, counterfeiting and copying of the substrate is made more difficult. For example, to photocopy the article with the attached dielectric material will result in an inaccurate copy.
  • the dielectric material reflects coloured light such that the resulting copy will contain areas corresponding to the patches of dielectric material which will be distorted. Any attempt to tamper with or remove the dielectric material will damage the article by possibly tearing the document so that successful copying is not possible.
  • the thin film security device (TFSD) produced in accordance with the present invention which device incorporates a UV cured adhesive as previously described, must meet a number of requirements so that it is durable in use, that is, so that the thin film security device (TFSD) will last at least as long as any bank note to which it is applied.
  • the fully cured adhesive (24 hours or more after application on banknotes) with a top layer of thin film material must survive the following mechanical and chemical tests without a significant amount of thin film being removed, the judgement being made visually.
  • the allowable amount of thin film removal is less than 10%.
  • Crumple test - to evaluate the ability of a TFSD printed bank note to survive folding and creasing.
  • the thin film adhesive layers are placed on a square piece of bank note 2.25 inches on a side. This piece is rolled into a cylinder, fitted into a metal cylinder, then compressed inside the cylinder with a closely fitting piston using a specified weight as the compression force.
  • the piece is removed from the cylinder, unrolled, moved through 90 degrees and replaced in the cylinder for another compression (a second crumple) .
  • the adhesive-thin film layers must survive four crumples.
  • the apparatus used in this test is commonly known as the IGT Crumple Tester. Crumpled specimens are compared with existing exemplars from previous tests, (ii) Abrasion Test - to evaluate the ability of a TFSD printed bank note to survive the surface abrasion encountered during circulation:
  • abrasion testing device similar to the Taber Abraser, a test is performed first on an area of the specimen note not containing a TSFD, to establish the effect of abrasion on intaglio ink. Two abrasion intensities are established; the first corresponding to just noticeable wear of the intaglio ink, the second corresponding to obvious wear. Two TFSD specimens are then subjected to the same treatments using the Taber model 503 Abraser, testing is performed with Taber CS10 abrading wheels with a standard 250 gram loading. The test is run for 100 cycles, after which just noticeable wear of the intaglio print of the bank note has occurred. Abraded specimens are compared to existing exemplars from previous tests, (iii) Laundering Test - to evaluate the ability of the TSFD printed note to withstand laundering:
  • TFSD specimen secured to an article of clothing
  • the specimen is subjected to a normal hot wash laundering cycle using a powerful detergent.
  • Samples are enclosed in shirt pockets and subjected to a normal hot wash cycle: 3/4 cup (approximately 170 ml) "Tide” detergent with bleach in 41 litres of water (0.4%) at 43°C for 10 minutes, followed by a ten minute rinse in 41 litres of water at 20°C, and a final four minute spin at room temperature.
  • Chemical Resistance Test to evaluate the ability of a TFSD printed bank note to resist exposure to chemicals: Specimen notes with a TFSD are immersed in the following chemicals for the times and temperatures specified, and allowed to dry in air.
  • Samples (e) , (f) and (g) were water rinsed to remove the chemical before drying.
  • Adhesive formulations were prepared by mixing together the following ingredients, in the proportions indicated, as expressed in Table 1:
  • Tests were run on the TACS using the formulations given in Table 1. Viscosities were measured just prior to testing and adjusted with the appropriate vinyl ether diluent where necessary. Each test run was first made with one bank of UV lamps and the machine speed was increased from 120 to 140 to 160 feet per minute; and then a second bank of UV lamps was turned on and the machine speed was decreased from 160 to 140 to 120 feet per minute. Results are shown in Table 2.
  • IB s ngle bank of UV lamps

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)

Abstract

Composition de contact polymérisable par rayons ultraviolets (UV) qui, lorsqu'elle est irradiée par les ultraviolets, atteint rapidement un état collant important permettant le transfert d'un matériau diélectrique, et en quelques heures se lie de manière permanente au matériau diélectrique, de manière à former un dispositif de sécurité à couche mince (TFSD). L'adhésif de contact polymérisable par rayons UV comprend: (a) au moins un copolyester saturé ayant des doubles liaisons terminales acryliques et des fractions d'hydroxyle; (b) au moins un colorant dispersé dans un liquide sélectionné dans le groupe contenant un monomère acrylique, un monomère d'éther vinylique, leurs oligomères et leurs mélanges; (c) au moins un monomère d'éther vinylique, ses oligomères, ou les mélanges dudit monomère d'éther vinylique et de ses oligomères; et (d) au moins un photo-initiateur dans une quantité suffisante pour rendre la composition collante environ 1 seconde après l'exposition aux rayons ultraviolets. L'invention décrit également un procédé d'obtention d'un substrat (et plus spécialement du papier pour billets de banque) avec des indices, consistant à: (1) former un stratifié composé (a) d'un film polyester ayant une épaisseur de 12 à 25 microns, (b) d'un revêtement de sûreté d'une épaisseur de 1 à 2 microns, (c) d'une couche de protection de 1 à 2 microns d'épaisseur et (d) d'une pile de couches diélectriques et/ou métalliques ayant une épaisseur maximale de 1 micron; (2) créer plusieurs zones sur le substrat, chacune de ces zones étant enduites d'un adhésif de contact polymérisable aux UV tel que décrit ci-dessus; (3) soumettre le substrat comportant lesdites zones enduites d'adhésif aux rayons UV de manière à ce que les zones deviennent très collantes; (4) amener la face externe de la pile de couches diélectriques et/ou métalliques en contact sous pression avec les zones enduites d'adhésif sur le substrat, faisant ainsi adhérer le stratifié aux zones enduites d'adhésif sur le substrat; et (5) enlever le stratifié du substrat, de sorte que les couches diélectriques et/ou métalliques se séparent du revêtement de sécurité et adhèrent fermement auxdites zones enduites d'adhésif sur le substrat.
PCT/CA1992/000110 1991-09-06 1992-03-16 Adhesif pour dispositif de securite a couche mince WO1993005124A1 (fr)

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US755,771 1991-09-06

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994013749A1 (fr) * 1992-12-14 1994-06-23 Bank Of Canada Procede et adhesif pour l'application d'un dispositif de securite a film mince
WO1995031337A1 (fr) * 1994-05-13 1995-11-23 Prittie Allan R Procede de transfert d'image
US5629093A (en) * 1994-07-08 1997-05-13 Minnesota Mining And Manufacturing Company Transparent multilayer film and its use for protection of data on documents as well as a tamper-proof label
WO1999033931A1 (fr) * 1997-12-23 1999-07-08 Henkel Kommanditgesellschaft Auf Aktien Adhesif pour stratifies durcissable par rayonnement et son utilisation
EP0684908B2 (fr) † 1993-02-19 2002-09-04 Giesecke & Devrient GmbH Document de securite et son procede de production
WO2006005434A1 (fr) 2004-07-14 2006-01-19 Giesecke & Devrient Gmbh Element de securite et procede pour le realiser
DE102009031877A1 (de) 2008-12-23 2010-07-01 Giesecke & Devrient Gmbh Sicherheitselement mit verbessertem Heißsiegelklebstoff
WO2024094521A1 (fr) * 2022-11-03 2024-05-10 Surys Dispositif optique de sécurité

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US4856857A (en) * 1985-05-07 1989-08-15 Dai Nippon Insatsu Kabushiki Kaisha Transparent reflection-type
US4930866A (en) * 1986-11-21 1990-06-05 Flex Products, Inc. Thin film optical variable article and method having gold to green color shift for currency authentication

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US3858977A (en) * 1972-01-18 1975-01-07 Canadian Patents Dev Optical interference authenticating means
EP0165021A2 (fr) * 1984-06-08 1985-12-18 Canadian Patents and Development Limited Dispositif utilisant une forme en couche d'interférence optique pour authentification
US4856857A (en) * 1985-05-07 1989-08-15 Dai Nippon Insatsu Kabushiki Kaisha Transparent reflection-type
US4930866A (en) * 1986-11-21 1990-06-05 Flex Products, Inc. Thin film optical variable article and method having gold to green color shift for currency authentication

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994013749A1 (fr) * 1992-12-14 1994-06-23 Bank Of Canada Procede et adhesif pour l'application d'un dispositif de securite a film mince
EP0684908B2 (fr) † 1993-02-19 2002-09-04 Giesecke & Devrient GmbH Document de securite et son procede de production
WO1995031337A1 (fr) * 1994-05-13 1995-11-23 Prittie Allan R Procede de transfert d'image
US5629093A (en) * 1994-07-08 1997-05-13 Minnesota Mining And Manufacturing Company Transparent multilayer film and its use for protection of data on documents as well as a tamper-proof label
WO1999033931A1 (fr) * 1997-12-23 1999-07-08 Henkel Kommanditgesellschaft Auf Aktien Adhesif pour stratifies durcissable par rayonnement et son utilisation
US6565696B1 (en) 1997-12-23 2003-05-20 Henkel Kommanditgesellschaft Auf Aktien Laminating adhesive hardenable by radiation and use of same
WO2006005434A1 (fr) 2004-07-14 2006-01-19 Giesecke & Devrient Gmbh Element de securite et procede pour le realiser
US9840071B2 (en) 2004-07-14 2017-12-12 Giesecke+Devrient Currency Technology Gmbh Security element and method for producing the same
DE102009031877A1 (de) 2008-12-23 2010-07-01 Giesecke & Devrient Gmbh Sicherheitselement mit verbessertem Heißsiegelklebstoff
WO2024094521A1 (fr) * 2022-11-03 2024-05-10 Surys Dispositif optique de sécurité
FR3141639A1 (fr) * 2022-11-03 2024-05-10 Surys Dispositif optique de sécurité

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TW226405B (fr) 1994-07-11

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