JP4543921B2 - Anti-paste sticker - Google Patents

Description

  The present invention is a seal that is used by being affixed to an object to be adhered (adhered body) with an adhesive layer that constitutes a part thereof, and particularly includes holograms that have been used for authentication of brand protection in recent years. OVD (Optical Variable Device), which changes its color and image depending on the direction of light, is used, and when it is replaced, the OVD layer that forms part of it is transformed into an unrecoverable state. Further, the present invention relates to an anti-replacement seal characterized in that it can be peeled from the adherend without leaving a part of an adhesive layer or the like.

  In recent years, holograms, diffraction gratings, or thin films with different optical properties that can express stereoscopic images and special decorative images using light interference have been superimposed, and color changes depending on the viewing angle (color shift) Development of OVDs such as multilayer thin films, etc., in which the above occurs is underway. These OVDs have excellent decorative effects in order to display stereoscopic images and give a unique impression such as color shift, and are used in general printed materials such as various packaging materials, picture books, and catalogs. .

  In addition, since OVD requires advanced manufacturing technology for its production, it is used in the fields of credit cards, securities, certificates and the like as an effective medium for preventing forgery. Recently, in addition to securities, it is also affixed to sports equipment, computer parts and other electrical products and software, and can be affixed to certification seals to prove the authenticity of products and product packages. It has come to be widely used as a seal sticker.

  These authentication seals and seal seals are expected to be used illegally after being peeled off once attached to a genuine product and then replaced with a fake product. Many proposals have been made. Specifically, such a brittle type seal has a brittle layer made of a brittle material in part [see, for example, Patent Document 1]. In addition, a structure in which a portion having strong and weak adhesion is partially provided between the layers [see, for example, Patent Document 2]. ].

However, these are all configured to cause peeling or breakage between layers or layers, and to separate the adhesive layer side and the support side to break the seal. There is a drawback that a part of the adhesive layer or the like remains on the adherend and the adherend becomes dirty.
Utility Model Registration No. 2032258 JP-A-8-152842

The present invention has been made in view of the above situation, and is an OVD seal in which at least an OVD layer and an adhesive layer are laminated on a support, and the OVD layer is restored when it is to be replaced. The OVD image that appeared before the replacement is not observable or the color shift effect cannot be exhibited, and when the seal is peeled off, a part of the adhesive layer etc. An object of the present invention is to provide an anti-sticking seal characterized in that it does not remain on the adherend side.

The present invention has been made to achieve the above object, and the invention according to claim 1 is an OVD seal in which at least an OVD layer and an adhesive layer are laminated in this order on a support. The anti-replacement seal is characterized in that a deformable layer made of a polymer material having a flexible elongation at break of 100% or more is provided between the upper OVD layer .

The invention according to claim 2 is the anti-replacement seal according to claim 1, wherein the deformation layer is partially formed so as to be sandwiched between the support layer and the OVD layer. And

  Since the anti-replacement seal of the present invention is configured as described above, when peeling from the adherend, it is peeled off only at the interface with the adherend to be attached without causing delamination. Therefore, a part of the seal does not remain on the adherend and the adherend is not soiled. In addition, if the seal is peeled off from the adherend, the deformable layer is stretched and deformed, and the OVD layer is deformed to an unrecoverable state. Even if it is pasted on the body, the same OVD image and color shift as before the pasting are not recognized in the sticker after the pasting. In addition, since this deformation remains as a trace to be removed, it can be used for verification of unauthorized use.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.

  FIG. 1 is a cross-sectional explanatory view showing an example of the basic configuration of the anti-replacement seal of the present invention, and FIG. 2 shows the state of the anti-replacement seal when trying to peel off the adherend (adhered body). It is explanatory drawing.

  1 includes a deformable layer 4 provided on a part of a support 1, and further includes an OVD layer 2 having a laminated structure so that the deformed layer 4 is interposed therebetween. The adhesive layer 3 is laminated on the top.

  As the support 1, a film made of synthetic resin or natural resin such as polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene, polyethylene, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyvinyl alcohol, or the like is laminated. Specific examples include laminated sheets and the like.

  The support 1 has an OVD layer 2 laminated thereon. When the OVD layer 2 is laminated, heat support is applied to form a fine uneven pattern such as a hologram on the support 1. Therefore, it is necessary to select a material having heat resistance and strength that does not soften and deform due to hot pressure during the manufacturing process. The thickness is preferably about 2 to 25 μm in consideration of operability and workability.

  On the other hand, the deformation layer 4 is provided on a part of the surface of the support 1, and this layer extends when the seal is peeled off from the adherend, and the entire surface or a part of the layer is deformed. The OVD layer is provided so as to be deformed. Therefore, it is desired that the deformable layer 4 be sufficiently deformed compared to other layers, and it is preferable that the deformable layer 4 is formed from a highly flexible polymer material having a breaking elongation of 100% or more.

  Specifically, the deformable layer 4 is formed of a rubber-based resin such as natural rubber, isoprene rubber, styrene-butadiene rubber, butyl rubber, urethane resin, polyester resin, vinyl chloride-vinyl acetate copolymer, or the like. However, the forming material of the deformable layer 4 is not limited to these materials, and other known materials can be used as long as they can be deformed into an unrecoverable state by a force applied when the sheet is peeled.

  It is the OVD layer 2 that is laminated so as to sandwich the deformation layer 4 having the above-described configuration with the support 1. The OVD layer 4 is a portion where a stereoscopic image appears there by utilizing the interference of light, the appearing stereoscopic image changes, and the color changes depending on the difference in viewing angle. More specifically, a portion where a hologram or a diffraction grating is provided, that is, a display portion on which a fine uneven pattern based on light interference is recorded, or interference fringes based on light interference is recorded in the volume direction. It is a display part.

  On the other hand, the OVD layer 4 is composed of a multilayer thin film in which thin films of ceramics or metal materials having different optical characteristics are stacked and color change (color shift) is generated depending on the viewing angle. May be.

  Among these, in consideration of mass productivity and cost, a layer having a relief hologram (diffraction grating) or a layer made of a multilayer thin film is preferable.

  The OVD layer 10 of the anti-replacement seal shown in FIG. 1 is a layer provided with a relief-type hologram (diffraction grating), and has a two-layer structure of an OVD forming layer 2a and an OVD hardened layer.

  The OVD formation layer 2a is a layer provided with a fine uneven pattern related to a relief type hologram (diffraction grating). The fine concavo-convex pattern is obtained by, for example, producing a relief-type master plate having a fine concavo-convex pattern by an optical photographing method, and then replicating a nickel press plate by electroplating from the master plate. It is obtained by heating the press plate and then pressing it against the surface of the member constituting the OVD forming layer.

  Therefore, the OVD formation layer 2a is formed of a material that can form a fine uneven pattern with a press plate. Specifically, thermoplastic resins, thermosetting resins, ultraviolet or electron beam curable resins, and more specifically, thermoplastic resins such as acrylic resins, epoxy resins, cellulose resins, vinyl resins, and the like , A polyisocyanate added as a crosslinking agent to an acrylic polyol or polyester polyol having a reactive hydroxyl group, a crosslinked urethane resin, a thermosetting resin such as a melamine resin or a phenol resin, epoxy (meth) acryl, urethane ( It is formed by ultraviolet rays such as (meth) acrylate or electron beam curable resin, or a mixture thereof.

  On the other hand, the OVD effect layer 2b provided by being laminated on the OVD formation layer 2a is a layer provided to increase the diffraction efficiency in the OVD formation layer 2a. The constituent material of the OVD formation layer 2a has a refractive index. It consists of different materials.

As a material constituting the OVD formation layer 2a, a high refractive index material such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , ZnS, Al, Sn, Cr, Ni, Cu, etc. having a high reflection effect can be used. A metal material such as Au can be used.

The OVD formation layer 2a may be formed in a single layer or a multi-layer state by using a known thin film formation method such as a vacuum deposition method or sputtering using these materials. What is necessary is just about 50-10000cm. In addition, OV other than these
Examples of the method for forming the D layer include a method in which a coating material in which metal flakes are dispersed is provided. In addition, the OVD effect layer formed of these materials can be provided not only on the entire surface of the support but also partially.

  As described above, the OVD layer is a multilayer thin film in which thin films of ceramics or metal materials having different optical characteristics are laminated and a color change (color shift) is generated depending on the viewing angle. May be. Next, an OVD layer composed of such a multilayer thin film will be described.

Examples of materials used in forming each thin film include the following. First, as ceramics, Sb ₂ O ₃ (3.0 = refractive index n: the same applies hereinafter), Fe ₂ O ₃ (2.7), TiO ₂ (2.6), CdS (2.6), CeO ₂ (2.3), ZnS (2.3), PbCl ₂ (2.3), CdO (2.2), Sb ₂ O ₃ (2.0), WO ₃ (2.0), SiO (2. 0), Si ₂ O ₃ (2.5), In ₂ O ₃ (2.0), PbO (2.6), Ta ₂ O ₃ (2.4), ZnO (2.1), ZrO ₂ ( 2.0), MgO (1.6), SiO ₂ (1.5), MgF ₂ (1.4), CeF ₃ (1.6), CaF ₂ (1.3 to 1.4), AlF ₃ (1.6), Al ₂ O ₃ (1.6), GaO (1.7), etc., and the metals include Al, Fe, Mg, Zn, Au, Ag, Cr, Ni, Cu, Si, etc. Is mentioned. Examples of the low refractive index organic polymer include polyethylene (1.51), polypropylene (1.49), polytetrafluoroethylene (1.35), polymethyl methacrylate (1.49), polystyrene (1.60). ) And the like.

  The multilayer thin film is obtained by selecting appropriate materials from the above materials in consideration of optical properties such as refractive index, reflectance, and transmittance, weather resistance, interlayer adhesion, etc., and thinning them to obtain a laminate. It is done.

  For example, by selecting at least one kind from the above materials from a high refractive index material and at least one kind from a low refractive index material, and laminating them alternately as a thin film with a predetermined thickness, a specific wavelength is obtained. The visible light is absorbed or reflected to cause a color shift. Moreover, you may make it laminate | stack the combination of a specific thin film alternately.

  As a method for forming a multilayer thin film (OVD layer) having such a structure, a known method can be used. The film thickness, the film formation speed, the number of layers, or the optical film thickness (= n · d, n: refractive index) , D: film thickness) and the like, which can be controlled, are preferably employed by a normal vacuum deposition method or sputtering method.

  On the other hand, the adhesive layer 3 is a layer for attaching and fixing the anti-replacement seal of the present invention to the adherend, and the adhesive strength to the adherend is between the support and the OVD layer constituting the seal. It is set to be smaller than the interlayer adhesive strength. In this case, delamination does not occur in each layer constituting the seal, and the deformable layer and the OVD layer thereon are peeled from the adherend while being deformed into an unrecoverable state. .

  As a material for forming the adhesive layer, a pressure-sensitive adhesive that is adhered by pressure is used. Examples of the material for forming this layer include rubber adhesives such as natural rubber, isoprene rubber, styrene-butadiene rubber, and butyl rubber, acrylic adhesives such as ethyl acrylate and butyl acrylate, and urethane adhesives.

The above description has been made with reference to the configuration example in which at least the OVD layer and the adhesive layer are laminated on the support, which is the simplest configuration, but this configuration is a basic configuration. In the present invention, a known anti-counterfeiting ink that colors each layer or improves the designability by providing a printing layer between the layers or enables verification of ultraviolet / infrared light emitting ink or infrared absorbing ink is used. A printed layer may be formed to increase the forgery prevention effect.

  Hereinafter, the present invention will be described in more detail with reference to specific examples.

  First, a deformed layer forming material having the following composition was partially applied with a thickness of 3 μm on a support composed of a transparent polyethylene terephthalate (PET) film having a thickness of 25 μm by a gravure printing method to obtain a deformed layer.

Next, a thin film having a thickness of 5 μm is formed by gravure printing using an OVD forming layer forming material having the following composition so as to sandwich the deformed layer, and then relief is applied to the thin film by roll embossing. The relief pattern of the mold hologram was formed to form an OVD formation layer, and then an Al vapor deposition thin film layer (OVD effect layer) having a film thickness of 0.05 μm was formed thereon using a vacuum vapor deposition method. Thereafter, an adhesive having the following composition was applied to the Al vapor-deposited thin film layer with a thickness of 20 μm by a comma coating method to form an adhesive layer, and a release paper was laminated thereon, and the anti-replacement seal according to Example 1 Was made. Next, half-cutting and debris removal were performed from the support surface side of the seal produced in the above-described process to obtain a small piece of the anti-replacement seal.
[Deformation layer forming material]
Urethane resin (breaking elongation 600%) 15 parts methyl ethyl ketone 60 parts toluene 25 parts [OVD forming layer forming material]
Vinyl chloride-vinyl acetate copolymer 15 parts Urethane resin 10 parts Methyl ethyl ketone 50 parts Toluene 25 parts
[adhesive]
Acrylic adhesive ... 40 parts Isocyanate curing agent ... 5 parts Ethyl acetate ... 45 parts Toluene ... 10 parts

An OVD seal according to Example 2 for comparison was manufactured under the same conditions as in Example 1 except that the forming materials of the deformation layer, the OVD forming layer, and the adhesive layer were changed to the following compositions.
[Deformation layer forming material]
Polyester resin (breaking elongation 2%) ... 20 parts Methyl ethyl ketone ... 60 parts Toluene ... 20 parts [OVD forming layer forming material]
Vinyl chloride-vinyl acetate copolymer 15 parts Urethane resin 10 parts Methyl ethyl ketone 50 parts Toluene 25 parts
[adhesive]
Acrylic adhesive ... 40 parts Isocyanate curing agent ... 5 parts Ethyl acetate ... 45 parts Toluene ... 10 parts The small pieces of the seals according to Examples 1 and 2 obtained as described above were each made of an acrylic resin sheet. After being pasted on one side, it was stored at room temperature for one day, and then the seal was peeled off and the peel condition was tested. The results are shown in Table 1.

It is sectional explanatory drawing which shows an example of the basic composition of the sticking prevention seal | sticker of this invention. It is explanatory drawing which shows the state which is going to peel the sticking prevention seal | sticker of this invention from a to-be-adhered body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Support body 2 ... OVD layer 2a ... OVD formation layer 2b ... OVD effect layer 3 ... Adhesive layer 4 ... Deformation layer

Claims (2)

An OVD seal in which at least an OVD layer and an adhesive layer are laminated in this order on a support, and the flexible rupture elongation between the OVD layer on the support is 100% or more from a polymer material. An anti-replacement seal characterized in that a deformable layer is provided . 2. The anti-replacement seal according to claim 1, wherein the deformation layer is partially formed so as to be sandwiched between the support layer and the OVD layer .

Images