JP2011022236A - Re-sticking prevention sticker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a re-sticking prevention sticker capable of completely preventing reuse, by configuring such that even when the sticker is stripped by use of an organic solvent, the sticker leaves a trace and that the trace can not be removed. <P>SOLUTION: The re-sticking prevention sticker includes at least an OVD (optically variable device) layer and an adhesive layer formed in this order on a support made of a polymer resin material and has such characteristics that after the sticker is once adhered to an article, the sticker breaks upon forcible stripping. The sticker includes a solvent dissolution layer between the OVD layer and the adhesive layer, the solvent dissolution layer containing a dye to be dissolved in an organic solvent or a pigment to be dispersed in the organic solvent. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sticking prevention sticker, and in particular, pasting using an OVD (optical device whose color or image changes depending on the direction of light) including a hologram used for authentication of brand protection in recent years. The present invention relates to a replacement prevention seal.

In recent years, multilayer interference films and diffraction gratings that produce color changes (color shifts) depending on the viewing angle by overlaying holograms that can express stereoscopic images and special decorative images using light interference and thin films with different optical characteristics Development of an OVD (Optically Variable Device) using the above is underway. These OVDs have an excellent decorative effect in order to give a unique impression such as a stereoscopic image and color shift, and have been used for general printed materials such as various packaging materials, picture books, catalogs and the like.
In addition, since advanced manufacturing technology is required for manufacturing OVD, credit cards, securities, certificates, etc., have been formed and used as effective counterfeiting means. Recently, in addition to securities, electrical products such as sports equipment and computer parts, CDs and DVDs with various software recorded on them, and certification seals that prove the authenticity of the products, and packages of those products It has come to be widely used as a seal sticker to be attached to.

Since these authentication seals and seal seals are removed once and then illegally reused by replacing them with fake products, anti-replacement seals that can be destroyed when removed have been proposed.
For example, a configuration in which a brittle layer is provided between layers of the seal and the portion is broken when peeled off (Patent Document 1), or a portion having a weak adhesive force or a strong portion is provided between the layers, and a weak portion is peeled off and broken when peeled off (Patent Document 2) has been proposed. However, even with these constitutions, it has been impossible to prevent the technique of peeling while impregnating the adhesive layer with the organic solvent. In order to prevent this technique, a proposal has been made to provide a layer that develops color with an organic solvent on the seal surface (Patent Document 3).

No.05-31671 Japanese Patent Laid-Open No. 08-152842 Japanese Patent Laid-Open No. 10-268772

  In the configuration described in Patent Document 3, when the organic solvent is used for peeling off, the surface is colored, and even if the seal is peeled off, it cannot be reused as it is. However, there is a problem that, after the seal is peeled off, if the colored layer on the surface is completely removed with a solvent and printing is performed in the same color as the original seal, it can be reused.

  The problem of the present invention is that the trace remains even if the seal is peeled off using an organic solvent, and it is impossible to remove the trace so that the above-mentioned reuse can be completely prevented. It is to provide an anti-replacement seal.

The invention according to claim 1 is an anti-replacement seal in which at least an OVD layer and an adhesive layer are formed in that order on a support made of a polymer resin material, and between the OVD layer and the adhesive layer. An anti-replacement seal having a solvent-dissolving layer containing a dye or a pigment to be dispersed in an organic solvent.

  A second aspect of the present invention is the anti-replacement seal according to the first aspect, wherein a light transmitting portion is provided on a part or the whole of the OVD layer.

  The invention according to claim 3 is characterized in that a notch that penetrates the support and the OVD layer and reaches the solvent-dissolving layer is provided. It is.

  The invention described in claim 4 is characterized in that a release layer made of a polymer resin material that is easily peeled off from the support is provided in part or all between the support and the OVD layer. The re-sticking prevention seal according to claim 1.

  The invention according to claim 5 is characterized in that a second release layer made of a polymer resin material that easily peels off from the OVD layer is provided in a part between the OVD layer and the solvent-soluble layer. It is an anti-replacement sticker described in 1.

  The invention described in claim 6 is characterized in that the dye or pigment contained in the solvent-soluble layer is an ultraviolet-excited visible light-emitting material or an infrared-excited visible light-emitting material that can be dissolved or dispersed in an organic solvent. Item 6. The anti-replacement seal according to any one of Items 1 to 5.

  According to the present invention, it is impossible to remove the authentication seal or the like using a solvent and perform unauthorized reuse.

Sectional drawing which shows the structure of one Example of this invention Sectional drawing which shows the concept of the condition where a solvent melt | dissolution layer colors, when peeling the seal | sticker of this invention shown in FIG. 1 with the organic solvent Sectional drawing which shows the structural example of a sticking prevention seal

  According to the invention described in claim 1, since a layer containing a dye or pigment that dissolves in an organic solvent is provided between the pressure-sensitive adhesive layer and the OVD layer, the organic solvent is soaked in the pressure-sensitive adhesive and peeled off. The dye or pigment in the solvent-dissolving layer dissolves or disperses, and the OVD layer is colored with the dye or pigment, so that the trace of the solvent removal remains. Even after wiping with an organic solvent to remove the portion, the OVD layer also melts and it is impossible to remove only the trace.

  According to the second aspect of the present invention, by providing a light transmission part in a part of the OVD layer, it is easy to confirm the trace of dissolution or dispersion of the dye or pigment.

  The invention according to claim 3 is a structure in which the dye and the dispersed pigment that are dissolved by making a cut are easily penetrated into each layer from the cut part, making it easier to confirm and making it difficult to remove the penetrated part. is there.

In the inventions according to claims 4 and 5, since the specific interlayer is easily peeled off and easily broken, when the organic solvent is to be peeled off, it is necessary to sufficiently soak the organic solvent into the adhesive layer. Therefore, the dyes and pigments are easily dissolved or dispersed, and the trace becomes large, so that it is easy to confirm.

The invention according to claim 6 is configured such that the trace of the solvent removal can be confirmed by irradiating ultraviolet rays or infrared rays and emitting light at that time. Unauthorized users who have attempted to remove organic solvents are not aware of it and can detect the illegally used seals.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The anti-replacement seal shown in FIG. 1 comprises a support 1, an OVD layer 3 composed of an OVD forming layer 3a and an OVD effect layer 3b, a solvent-dissolving layer 5, and an adhesive layer 6 sequentially laminated. FIG. 2 is a diagram showing traces of the organic solvent soaked in the seal after the seal is applied to the article (adhered body). The dye or pigment contained in the solvent-dissolving layer 5 is shown in FIG. It shows a state where it is dissolved or dispersed and soaked into the OVD layer.

  The support 1 may be a transparent film having heat resistance and strength that is not softened and deformed by thermocompression bonding at the time of sealing, and the material thereof is polyvinyl chloride, polyester, polycarbonate, polymethyl methacrylate, polystyrene, polyethylene, Examples thereof include synthetic resins and natural resins such as polyethylene terephthalate, polyethylene naphthalate, polypropylene, and polyvinyl alcohol, and the thickness is preferably about 16 to 100 μm in consideration of operability and workability.

  Next, the OVD layer 3 will be described. The OVD is an optical element that uses light interference and diffraction, and has a function of causing a color shift in which the color changes depending on the representation of a stereoscopic image and the viewing angle. Among them, those produced with a relief hologram (diffraction grating) or a multilayer interference film are generally widely used.

  First, a relief-type hologram (diffraction grating) is obtained by molding a concavo-convex pattern of a hologram by thermocompression-bonding the mold to the OVD forming layer 3a. Molecular resin material is used.

The OVD effect layer 3b is made of a material having a refractive index different from that of the polymer material constituting the relief surface in order to increase the diffraction efficiency of OVD. As a material to be used, high refractive index materials such as TiO ₂ , Si ₂ O ₃ , SiO, Fe ₂ O ₃ , and ZnS having different refractive indexes, Al, Sn, Cr, Ni, Cu, and Au having a higher reflection effect are used. These materials can be used, and these materials can be used alone or in layers. These materials are formed by a well-known thin film forming technique such as vacuum deposition or sputtering, and the film thickness varies depending on the application, but is formed at about 50 to 10,000 mm. In addition to these methods, a method in which a coating material in which metal scales are dispersed is provided.

  When a highly refractive material is used in the above, since it becomes a light transmissive reflective film, it is easy to observe the change of the solvent-dissolved layer 5, but when the above metal material is used, it does not transmit light, so the OVD effect layer. It is preferable to provide part 3b and make a light transmission part in a part so that a dye or pigment dissolved or dispersed in a solvent can be easily confirmed. (See Figure 1)

On the other hand, a multi-layer thin film type OVD is composed of multi-layer thin film layers having different optical characteristics, and is laminated 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 indexes are stacked, a high refractive index thin film and a low refractive index thin film may be combined, or a specific combination may be stacked alternately. These are appropriately selected based on optical characteristics such as refractive index, reflectance, and transmittance, weather resistance, interlayer adhesion, and the like, and are laminated as a thin film to form a multilayer interference film. As a forming method, a normal vacuum deposition method or a sputtering method capable of controlling the film thickness, the film forming speed, the number of stacked layers, or the optical film thickness (= n · d, n: refractive index, d: film thickness), etc. Is formed.

  The solvent-dissolving layer 5 is used by dispersing a dye or pigment soluble in various organic solvents and not dissolved or dispersed in water in a polymer resin dissolved in water or a water-dispersible polymer resin (emulsion ink). In this case, a dye or pigment having the same solubility or dispersibility as that of the pressure-sensitive adhesive layer is appropriately selected, and the addition amount varies depending on the solubility or dispersibility of the dye or pigment, but about 1 to 50% is added to the resin. It is preferable to do. About 1 to 20 μm is formed by various coating methods and printing methods using this ink. It is also possible to add a plurality of dyes or pigments or add a white pigment to hide the color in a dispersed state.

  The pressure-sensitive adhesive layer 6 is a layer for attaching and fixing an OVD seal to an adherend, and a pressure-sensitive pressure-sensitive adhesive that is bonded by pressure is used. Examples include natural rubber, isoprene rubber, styrene-butadiene rubber, butyl rubber, and other rubber adhesives, acrylic adhesives such as ethyl acrylate and butyl acrylate, urethane adhesives, and the like. If it is water-based ink, it can be coated directly, but if it is solvent-based ink, it is applied to release paper (separator) in advance by 10-50 μm, and after drying sufficiently, the solvent component is removed and pasted. .

Next, the structure of the seal according to the fifth aspect of the present invention shown in FIG. 3 will be described.
The structure of the seal of the present invention is provided with a part that is easily peeled off between each layer, and it is designed to break if it is forcibly peeled off, and it is designed so that it cannot be peeled off unless the organic solvent is sufficiently soaked in the adhesive layer Has been.
Therefore, the trace of solvent peeling becomes large, and the configuration is easy to confirm.

The feature of this configuration is that a release layer 2 and a second release layer 4 that are easily peeled off between layers are provided.
In this configuration, the balance of interlayer adhesive strength (peel strength) is important, and the following conditions must be satisfied. When the adhesive strength (peel strength) between the respective layers is defined as follows, the balance of the adhesive strength (peel strength) needs to be B) <A) <C).
A) Peel strength between the support 1 and the release layer 2 B) Peel strength between the OVD effect layer 3b and the second release layer 4 C) Adhesive strength between the adhesive layer 6 and the article to be attached

  These release layers are made of a polymer resin material and are provided in a thickness of about 0.1 to 10 μm by various coating methods and printing methods.

The present invention will be described in detail with specific examples.
First, each layer was provided in the following steps on a support 1 made of a transparent polyethylene terephthalate (PET) film having a thickness of 38 μm.
1) Apply 2 μm of OVD forming layer by gravure method.
2) An OVD relief pattern is formed by roll embossing.
3) A vacuum-deposited thin film layer (OVD effect layer) of 0.05 μm of titanium oxide is formed.
4) Apply 5 μm of solvent-soluble layer by gravure method.
5) A release paper (separator) coated with 20 μm of an adhesive layer was bonded.
Through the above steps, the anti-replacement seal of the present invention was produced.
[OVD forming layer paint]
Vinyl chloride-vinyl acetate copolymer 15 parts Urethane resin 10 parts Methyl ethyl ketone 50 parts Toluene 25 parts
[Solvent Soluble Layer Paint]
Acrylic emulsion ink: 70 parts Red dye: 3 parts The dye was sufficiently dispersed in the ink.
[Adhesive layer paint]
Acrylic adhesive ... 40 parts Isocyanate curing agent ... 5 parts Ethyl acetate ... 45 parts Toluene ... 10 parts

Each layer was provided in the following steps on a support made of a transparent polyethylene terephthalate (PET) film having a thickness of 38 μm. (See Figure 3)
1) 2 μm coating of release layer by gravure method 2) 2 μm coating of OVD formation layer by gravure method 3) Formation of OVD relief pattern by roll embossing method 4) Deposition thin film of 0.05 μm titanium oxide by vacuum deposition method Formation of layer (OVD effect layer) 5) A second release layer was partially provided by 1 μm by a gravure printing method.
6) Solvent-dissolved layer was applied by 5 μm by gravure method. 7) Release paper (separator) coated with 20 μm of adhesive layer was bonded. The above-described process produced the anti-replacement seal shown in FIG.
The same [OVD forming layer coating material], [solvent dissolving layer coating material], and [adhesive layer coating material] as in Example 1 were used.
[Peeling layer and second peeling layer paint]
Acrylic resin ... 10 parts Ethyl acetate ... 60 parts Toluene ... 30 parts

<Comparative example>
As a comparative example, a seal excluding the solvent-dissolved layer was produced using the material of <Example 1>.
The above-obtained seal was attached to an acrylic plate and allowed to stand at room temperature for 24 hours, and then an attempt was made to remove the seal using an organic solvent (acetone).
Table 1 shows the results.

  As described above, even if the organic solvent is soaked into the seal of the present invention and peeled off, the dye or pigment is dissolved or dispersed, causing an irreversible change and being unusable. In particular, in the configuration of Example 2, the color development of the dye was increased because the organic solvent was not sufficiently impregnated and it was broken.

  The anti-replacement seal of the present invention can be used for brand protection as a sealing seal or an approval seal for electrical products such as sports equipment and computer parts, software, and the like. In addition, in the configuration using a light-transmitting reflective layer such as titanium oxide as in this embodiment, the pattern under the seal can be confirmed, so that it can be used as a seal that prevents information on the passport and ID card from being rewritten. .

DESCRIPTION OF SYMBOLS 1 Support body 2 Release layer 3 OVD layer 3a OVD formation layer 3b OVD effect layer 4 Second release layer 5 Solvent dissolution layer 6 Adhesive layer

Claims (6)

  In an anti-replacement seal in which at least an OVD layer and an adhesive layer are formed in this order on a support made of a polymeric resin material, a dye or dispersion dissolved in an organic solvent between the OVD layer and the adhesive layer An anti-replacement seal comprising a solvent-dissolving layer containing a pigment to be used.   The anti-replacement seal according to claim 1, wherein a light transmissive portion is provided on a part or all of the OVD layer.   3. The anti-replacement seal according to claim 1, wherein a cut is provided through the support and the OVD layer to reach the solvent-dissolving layer.   The re-sticking prevention according to any one of claims 1 to 3, wherein a release layer made of a polymer resin material that is easily peeled off from the support is provided on a part or all of the support and the OVD layer. sticker.   5. The anti-replacement seal according to claim 4, wherein a second release layer made of a polymer resin material that is easily peeled off from the OVD layer is provided in a part between the OVD layer and the solvent-soluble layer.   The dye or pigment contained in the solvent-dissolving layer is an ultraviolet-excited visible light-emitting material or an infrared-excited visible light-emitting material that can be dissolved or dispersed in an organic solvent. The anti-replacement seal described in 1.