JP2002366042A - Ovd seal and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an OVD(optical variable device) seal which is effective to prevent illegal action by re-sticking in such a manner that even when illegal action is tried by releasing the pressure sensitive adhesive of the seal by using a commercially available removing agent for labels, re-sticking of the seal accompanied by the action can be prevented and a method for manufacturing the seal. SOLUTION: The seal has at least two layers of an OVD layer and an adhesive layer in this order on a supporting body made of a polymer resin material. A part of the adhesive layer or the whole layer is formed from a hardening resin. The seal features that a resin to be hardened by irradiation of electron beams is used for the adhesive layer, that OVD layer is hardly removed from the supporting body, that an easily removable part and a hardly removable are both formed between the supporting body and the OVD layer, or that an easily removable part and a hardly removable part are formed between the OVD layer and the adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an effective technique for preventing re-sticking. In particular, the color and image change depending on the direction of light such as a hologram used recently for authentication of brand protection and the like. O using OVD
It relates to a VD seal.

[Prior art]

In recent years, a hologram, a diffraction grating, or a thin film having different optical characteristics is superimposed so that a three-dimensional image or a special decorative image can be expressed by using light interference. OVD (OpticalVari) represented by an optical multilayer thin film
The development of an abbreviated device (abbreviated as abbreviated Device) has been progressed in various places.

[0003] These OVDs have an excellent decorative effect in order to give a unique impression such as a stereoscopic image and a color shift, and have been used for various printed materials such as various packaging materials, picture books and catalogs. Further, since the OVD requires a high level of manufacturing technology, it is formed on a part or the whole of a credit card, securities, certificates, etc. and is used as an effective counterfeit prevention means. In recent years, in addition to securities, it has been pasted on software such as sports goods and computer parts, as well as electronic product software, etc., as a certification seal to prove the authenticity of the product and a seal sticker attached to the package of those products Has also become widely used.

[0004]

These so-called authentication seals and sealing seals are once peeled off, and may be counterfeited to be replaced on another product (usually a fake article in the case of fraud). Therefore, there has been proposed a so-called brittle type seal in which if peeled off, it will break somewhere. For example, utility model registration No. 20322
According to No. 58, a layer using a brittle material is provided in a part of the structure, and if the layer is forcibly peeled off, the destruction of the layer using the brittle material triggers the destruction. It is characterized by spreading. However, such a method has a drawback (problem) that the adhesive may be easily peeled off, for example, by using a commercially available label peeling agent (such as a seal peeling solution) to damage the adhesive.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to make it possible to use a commercially available label release agent to attack an adhesive to perform wrongdoing. An object of the present invention is to provide an OVD seal that is effective in preventing improper operation due to replacement, such as preventing accompanying replacement, and a method of manufacturing the same.

[0006]

Means for Solving the Problems To solve the above problems, the present invention provides a method in which at least two layers of an OVD layer and an adhesive layer are provided in this order on a support made of a polymer resin material. And a curable resin is used for part or all of the adhesive layer. (Claim 1)

The OVD seal according to claim 1, wherein the adhesive layer is made of a resin that is cured by electron beam irradiation. (Claim 2) According to this, it is possible to cure the resin in a short time and easily attach it.

[0008] OVD according to claim 1 or 2
A seal, wherein the OVD layer is partially provided in a surface of the OVD seal. According to this, it is possible to easily cure the adhesive from the support side.

The OVD seal according to any one of claims 1 to 3, wherein the support and the OVD layer are easily separated from each other. (Claim 4) According to this, if the support is forcibly peeled off, only the support is peeled and broken.

The OVD seal according to any one of claims 1 to 3, wherein a portion between the support and the OVD layer is provided with a portion which is easy to peel and a portion which is hard to peel. (Claim 5) According to this configuration, when peeling is attempted, partial destruction is caused, and even if it is attempted to return to the original state, it is impossible to restore.

The OVD seal according to any one of claims 1 to 5, wherein a portion between the OVD layer and the adhesive layer is easy to peel and a portion hard to peel. . (Claim 6)

On a support made of a polymer resin material, O
A method for producing an OVD seal, wherein at least two layers of a VD layer and an adhesive layer are laminated in this order, wherein a curable resin is used for a part or all of the adhesive layer. Is the way. (Claim 7)

In general, in the present invention, the adhesive layer is mainly composed of a curable resin, and it is difficult to peel it off with a commercially available label release agent, or even if it is peeled off, it will be broken somewhere, and it will be replaced. Provide an OVD seal effective for prevention.

[0014]

FIG. 1 is a sectional view showing the basic structure of a sticking prevention seal according to the present invention. 2, 3, and 4 are diagrams illustrating one configuration example of the sticking prevention seal of the present invention. A in the figure is a state before being peeled, and B in the figure is a figure showing a state when it is peeled and destroyed. Hereinafter, the present invention will be described in more detail with reference to these drawings.

The sticking prevention seal 11 shown in FIG.
A support 1, an OVD layer 2, and an adhesive layer 3 are sequentially laminated. FIGS. 2, 3, and 4 are seals of a type that completely breaks when they are to be peeled off, and is provided with a peeling layer 24 that is easily peeled between the layers, entirely or partially.

The base material 1 only needs to have heat resistance and strength so as not to be softened and deformed by heat and pressure during sealing. Examples of the material include polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene, polyethylene, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyvinyl alcohol, and other synthetic resins, natural resins, paper, and synthetic paper. The body can be used. It is also possible to coat the tough film with a soft thermoplastic resin and remove the film portion after attaching a processing intermediate or a seal to the substrate. The thickness is preferably about 2 to 25 μm in consideration of operability and workability.

Next, the OVD layer 2 will be described. OVD
Is an image using light interference or diffraction, and is a display member that causes a color shift in which the color changes depending on the expression of a stereoscopic image and the viewing angle. Among them, OVDs such as holograms and diffraction gratings include a relief type for recording interference fringes of light on a plane as a fine uneven pattern and a volume type for recording interference fringes in a volume direction. On the other hand, there is a multilayer film method in which thin films of ceramics or metal materials having different optical characteristics are laminated and a color change (color shift) is caused depending on a viewing angle, which is different from a hologram or a diffraction grating. Among these OVDs, in consideration of mass productivity and cost, a relief hologram (diffraction grating) or a multilayer thin film type is preferable, and these OVDs are generally widely used.

A relief type hologram (diffraction grating) is produced by an optical photographing method by producing a relief type master plate having a fine concavo-convex pattern, and mass-produced by a nickel press plate whose pattern is duplicated by an electroplating method. I do. That is, the press plate is heated to form the OVD forming layer 2a.
To duplicate the uneven pattern.

The OVD forming layer 2a is required to have a performance capable of being molded by a press plate, and may be made of any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray or an electron beam curable resin. Examples include thermoplastic resins such as acrylic resins, epoxy resins, cellulosic resins, and vinyl resins, and urethanes obtained by adding a polyisocyanate as a crosslinking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group as a crosslinking agent. Resins, thermosetting resins such as melamine resins and phenolic resins, and ultraviolet or electron beam curable resins such as epoxy (meth) acrylic and urethane (meth) acrylates can be used alone or in combination. In addition, even if the material is other than the above, if it is a known material that can form an OVD image,
Can be used.

The OVD effect layer 2b is made of a material having a different refractive index from the polymer material forming the relief surface in order to increase the diffraction efficiency of the OVD image. As materials to be used, TiO2, Si2O3, SiO, Fe2O3, Z
high refractive index material such as nS, Al with higher reflection effect,
Examples include metal materials such as Sn, Cr, Ni, Cu, and Au, and these materials can be used alone or in a laminate. These materials are formed by a known thin film forming technique such as a vacuum evaporation method and a sputtering method.

On the other hand, when the multi-layer thin film method is used, as described above, the OVD layer is composed of multi-layer thin films having different optical aptitudes, and is formed as a metal thin film, a ceramic thin film, or a composite thin film formed by combining them. . For example, when thin films having different refractive indices are stacked, a thin film having a high refractive index and a thin film having a low refractive index may be combined, or a specific combination may be alternately stacked. A desired multilayer thin film can be obtained by a combination thereof.

The multilayer thin film layer is made of a material such as ceramics or metal, and is formed by laminating approximately two or more high refractive index materials and a low refractive index material having a refractive index of about 1.5 to a predetermined thickness. It is. Examples of materials used below are given. First, as ceramics, Sb2O3 (3.0 =
Refractive index n: the same applies hereinafter), Fe2 O3 (2.7), TiO2
(2.6), CdS (2.6), CeO2 (2.3),
ZnS (2.3), PbCl2 (2.3), CdO
(2.2), Sb2O3 (2.0), WO3 (2.0),
SiO (2.0), Si2 O3 (2.5), In2 O3
(2.0), PbO (2.6), Ta2O3 (2.4),
ZnO (2.1), ZrO2 (2.0), MgO (1.
6), SiO2 (1.5), MgF2 (1.4), CeF
3 (1.6), CaF2 (1.3-1.4), AlF3
(1.6), Al2O3 (1.6), GaO (1.7) and the like, and a thin film of a single metal or an alloy, for example, Al, F
e, Mg, Zn, Au, Ag, Cr, Ni, Cu, Si
And the like. Examples of the organic polymer having a low refractive index include polyethylene (1.51), polypropylene (1.49), and polytetrafluoroethylene (1.3).
5), polymethyl methacrylate (1.49), polystyrene (1.60) and the like. By absorbing at least one of these high-refractive-index materials or metal thin films having a transmittance of 30% to 60% and at least one of low-refractive-index materials and alternately stacking them at a predetermined thickness, absorption of visible light of a specific wavelength is achieved. Or it will show reflection.

In the thin film made of metal, the optical characteristics such as the refractive index change depending on the state of the constituent materials and the forming conditions. Therefore, in the embodiment of the present invention, values under certain conditions are used. .

The above materials are appropriately selected based on optical properties such as refractive index, reflectance, transmittance, etc., weather resistance, interlayer adhesion, etc., and are laminated as thin films to form a multilayer thin film. A known method can be used for the formation method, and the film thickness, the film formation rate, the number of layers, or the optical film thickness (= n · d, n: refractive index, d: film thickness) can be controlled. Formed by a vacuum evaporation method or a sputtering method.

The OVD effect layer 2b can be formed by removing an arbitrary portion as shown in FIG. 4 or by removing an arbitrary portion. Below, the OVD effect layer 2 of FIG.
An example of a method of partially providing the OVD effect layer as in b. First, there is a method in which a pattern is printed on the OVD forming layer 2a with an ink using a water-soluble resin, the OVD effect layer 2b is provided, and then the water-soluble ink portion is washed.
Alternatively, a method of performing masking printing after providing the OVD effect layer, and then partially dissolving and removing the OVD effect layer 2b with an alkali or acidic chemical can be used. Any other known method such as a laser removal method can be used as appropriate. By partially providing the effect layer in this way, the design can be improved.

On the other hand, when an adhesive or the like which promotes curing by ultraviolet rays or electron beams, which will be described later, is used, light does not pass through the portion where the OVD effect layer 2b exists and curing cannot be expected, but the OVD effect layer 2b does not exist. Light can pass through the part and be cured. When this structure is peeled, a part is easily peeled off, and a part is hardly peeled off, and an effect of partially breaking can be expected.

The adhesive layer 3 is a layer for attaching and fixing the OVD seal to the adherend, and is made of a curable resin so as not to easily dissolve in the release agent. To be specific, a thermosetting adhesive which is completely cured by applying heat, an electron beam or ultraviolet curable adhesive, or the like is used. Examples thereof include a polyisocyanate as a crosslinking agent added to an acrylic polyol or a polyester polyol having a reactive hydroxyl group, and a thermosetting resin such as a urethane-based resin that promotes thermosetting, a melamine-cured resin, an epoxy-cured resin, or an epoxy (meth ) Ultraviolet or electron beam curable resins such as acryl and urethane (meth) acrylate. The above resins can be used alone or in combination with a thermoplastic resin or the like, but are not limited to known adhesives having high solvent resistance.

On the other hand, the peeling layer 24 is a layer provided so that the seal is peeled off entirely or partially when the seal is to be peeled, and the seal is broken, and can be provided between the layers. As a material of the release layer 24, any of a thermoplastic resin, a thermosetting resin, an ultraviolet ray or an electron beam curable resin may be used as long as the material is peeled between the layers.
Examples include thermoplastic polyacrylate resins,
Chlorinated rubber resin, vinyl chloride-vinyl acetate copolymer resin,
Thermoplastic resins such as cellulose resin, chlorinated polypropylene resin, epoxy resin, polyester resin, nitrocellulose resin, styrene acrylate resin, polyether resin, polycarbonate resin, urethane curing resin, and melamine curing Resin, thermosetting resin such as epoxy cured resin, and ultraviolet or electron beam curable resin such as epoxy (meth) acrylic and urethane (meth) acrylate.

In consideration of peelability, petroleum wax,
Various waxes such as vegetable waxes, metal salts of higher fatty acids such as stearic acid, release agents such as silicone oil, organic fillers such as Teflon (R) powder, polyethylene powder, silicone fine particles and acrylonitrile fine particles, By adding an inorganic filler such as silica fine particles, the cohesive force of the layer itself can be reduced, and the layer can be easily broken. The release layer is provided on the entire surface or a part of the support and the OVD layer and between the OVD layer and the adhesive layer, and can be designed to be easily broken at the time of release.

The above description has been given of the simplest configuration of the OVD seal of the present invention, in which the substrate 1, the OVD layer 2, and the adhesive layer 3 are laminated. This configuration is a basic configuration,
Each layer is colored or a printing layer is provided between the layers to improve the design, or to form a printing layer using a known anti-counterfeit ink that enables verification of ultraviolet / infrared light emitting ink or infrared absorbing ink. The anti-counterfeiting effect can also be appropriately increased according to the purpose. Further, a cut may be added to the seal to further prevent peeling.

[0031]

<Example 1> First, a 5 μm holographic layer was applied to a support made of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure method.
After forming an OVD relief pattern by a roll embossing method, a 0.05 μm-thick Al-deposited thin film layer (OVD effect layer) was provided by a vacuum evaporation method. Thereafter, a thermosetting adhesive was provided in a thickness of 20 μm by a comma coating method, and release paper was laminated to produce an OVD seal. Next, a half blanking process and a scrap removing process were performed from the substrate surface side to obtain an OVD seal shown in FIG. It is characterized in that the adhesive layer is made of a curable resin and provides a sticker that cannot be peeled off with a commercially available label peeling agent or is broken when peeled off.

[OVD-forming layer paint] Vinyl chloride-vinyl acetate copolymer: 15 parts Urethane resin: 10 parts Methyl ethyl ketone: 50 parts Toluene: 25 parts

[Adhesive coating] Acrylic adhesive: 50 parts Isocyanate: 10 parts Methyl ethyl ketone: 30 parts Toluene: 50 parts

<Comparative Example> After preparing a sheet on which OVD was formed in the same manner as in Example 1 described above, an adhesive having the following composition was provided by a comma coating method to a thickness of 20 μm, and release paper was laminated. A seal was made. Next, a half blanking process and a scrap removing process were performed to obtain an OVD seal of a comparative example.

Each of the OVD seals obtained as described above was affixed to cardboard paper, and the seal was peeled off using a release agent. Note that the seal of Example 1 was stuck at 60 ° C.
Tested after storing for -7 days. Table 1 shows the results.
Indicated.

[0036]

[Table 1]

Example 2 First, a release layer and a holo layer were formed on a support made of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure method.
After coating with μm and 5 μm, and then forming an OVD relief pattern by a roll embossing method, a 0.05 μm-thick Al-evaporated thin film layer (OVD effect layer) was provided by a vacuum evaporation method. Thereafter, etching was partially performed, and processing was performed so that Al deposition was left only in the central portion as shown in FIG.

Next, an ultraviolet-sensitive adhesive was provided in a thickness of 20 μm by a comma coating method, and release paper was laminated to produce an OVD seal. Further, a half blanking process and a scrap removing process were performed from the base material surface side to obtain an OVD seal shown in FIG.

[Release layer paint] Acrylic resin: 20 parts Methyl ethyl ketone: 40 parts Toluene: 40 parts

[OVD forming layer paint] Vinyl chloride-vinyl acetate copolymer: 15 parts Urethane resin: 10 parts Methyl ethyl ketone: 50 parts Toluene: 25 parts

[Adhesive layer coating] Acrylate-based UV-sensitive adhesive: 50 parts Methyl ethyl ketone: 20 parts

Each of the OVD seals obtained as described above was affixed to corrugated paper and irradiated with ultraviolet rays from the substrate side.
The adhesive was cured. When the seal of Example 3 thus adhered was to be peeled off, as shown in FIGS. 4 and 4B, the cured portion of the adhesive was peeled off at the release layer portion, and the uncured portion was peeled off at the adhesive portion. OVD destroyed. Table 2 shows the results of an attempt to peel using a release agent.

[0043]

[Table 2]

In any of the examples, the seal could not be peeled off even when a release agent was used.

[0045]

As described above, the OVD seal of the present invention is made of a hardening type adhesive which is hard to be broken by a release agent. . After all, according to the present invention, for example, even if an attempt is made to perform an illegal act by attacking the adhesive with a commercially available label release agent, it is effective to prevent illegal act by reattachment, such as preventing the accompanying sticking. An OVD seal and a method for manufacturing the same can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an OVD seal configuration according to the present invention.

FIG. 2A is a sectional view showing an example of an OVD seal configuration of the present invention. B: A cross-sectional view depicting a state of breaking when the OVD seal of the present invention shown in A is peeled off.

FIG. 3A is a sectional view showing an example of the OVD seal configuration of the present invention. B: A cross-sectional view depicting a state of breaking when the OVD seal of the present invention shown in A is peeled off.

FIG. 4A is a sectional view showing an example of an OVD seal configuration of the present invention. B: A cross-sectional view depicting a state of breaking when the OVD seal of the present invention shown in A is peeled off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... OVD layer 2a ... OVD formation layer 2b ... OVD effect layer 3 ... Adhesive layer 24 ... Release layer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G02B 5/32 G02B 5/32 G03H 1/18 G03H 1/18 G09F 3/02 G09F 3/02 A F term (reference) 2H049 AA07 AA25 AA40 AA64 AA68 CA07 CA09 CA22 CA28 2K008 AA13 EE04 FF11 FF12 FF13 FF14 GG05 4J004 AA10 AA12 AA13 AA14 AA15 AB05 AB06 AB07 CA01 CB03 DA02 DA03 DA05 DB04 FA01 4J040 EB131 EC001 EB131 EC001

Claims (7)

[Claims] 1. A support made of a polymer resin material is provided with O
An OVD seal in which at least two layers of a VD layer and an adhesive layer are laminated in this order, and a curable resin is used for part or all of the adhesive layer. 2. The OVD seal according to claim 1, wherein the adhesive layer is made of a resin that is cured by electron beam irradiation. 3. OVD according to claim 1 or 2
A seal, wherein the OVD layer is partially provided in a surface of the OVD seal. 4. The OVD seal according to claim 1, wherein a separation between the support and the OVD layer is facilitated. 5. The OVD seal according to claim 1, wherein a portion between the support and the OVD layer is provided with a portion that is easily peeled and a portion that is hardly peeled. 6. The OVD seal according to claim 1, wherein between the OVD layer and the adhesive layer, a portion which is easy to peel and a portion which is hard to peel are provided. . 7. A support made of a polymer resin material is provided with O
What is claimed is: 1. A method for manufacturing an OVD seal in which at least two layers of a VD layer and an adhesive layer are laminated in this order, wherein a curable resin is used for part or all of the adhesive layer. Method.