JPH08152842A - Hologram brittle seal - Google Patents

Abstract

PURPOSE: To provide a hologram brittle seal which is capable of preventing the readhesion of a hologram seal and makes the presence of a particularly partially brittle-fracturing layer hardly discoverable. CONSTITUTION: This hologram brittle seal is formed by successively providing the seal with a substrate 2, a hologram forming layer 3 having hologram patterns, a reflective thin-film layer 4, a first brittle release layer 5 which partially covers this reflective thin-film layer and an adhesive layer 6. The presence of the first brittle release layer from the outside after sticking of the seal is then hardly recognizable and a partial brittle fracture arises in the hologram in case of deliberate peeling. The reproduced image of the hologram is not affected by the presence of the first brittle release layer and the property to prevent illicitness is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram brittle seal which makes it difficult to perform fraud such as hologram replacement.

[0002]

2. Description of the Related Art A hologram capable of reproducing a three-dimensional image by using light interference requires a high-level manufacturing technique, but since it can be formed in the form of a seal, a foil or the like, it can be used as a card, a video cassette, a compact disc. It is affixed to the surface of articles such as discs, sports equipment, brand products, and ROM boards, and is used as a means for determining whether the article is genuine or illegitimate depending on the presence or absence thereof.

By the way, the hologram adhered to such an article is peeled off and peeled off by the support or the hologram layer or the peeling layer provided between them and the support or the hologram layer so as to prevent the re-adhesion from being abused. A hologram brittle seal or a hologram brittle seal in which a patterned peeling layer is formed between a support and a hologram forming layer and the support and the hologram forming layer are peeled off.
(See Japanese Patent Publication).

However, the former hologram brittle seal may completely peel off the entire hologram seal without destroying the hologram layer and the reflective thin film layer depending on the peeling method. On the other hand, the latter hologram brittle seal does not have such a defect, but when viewed with the hologram brittle seal attached, a patterned peeling layer is provided on the hologram forming layer and the reflective thin film layer. Therefore, the existence of the pattern can be visually discriminated, and not only the appearance of the reproduced image of the hologram is affected (especially in the case of the laser light reproduced hologram), but also the existence of fraud prevention measures is clarified. Have a problem

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hologram brittle seal which can prevent re-adhesion of the hologram sticker, and in which it is particularly difficult to find the presence of a layer that causes partial brittle fracture. And

[0006]

The present invention has been made to solve the above problems, and the invention according to claim 1 is
A hologram brittle seal characterized in that a support, a hologram forming layer having a hologram pattern, a reflective thin film layer, a first brittle peeling layer that partially covers the reflective thin film layer, and an adhesive layer are sequentially provided. .

The present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the configuration of a hologram brittle seal 1 according to claim 1.

The support 2 according to the present invention supports each of the layers constituting the hologram brittle seal during manufacture and, at the time of use, serves as the outermost layer and thus can serve as a protective layer. As such a support, a transparent resin film such as vinyl chloride resin or polyester resin can be used.

The hologram forming layer 3 having a hologram pattern formed on the support is required to be made of a resin which can be formed into a film, has good embossing moldability, is less likely to cause uneven press, and gives a bright reproduced image. To be done.

As a material for forming such a hologram forming layer, a thermoplastic resin such as a polycarbonate resin, a polystyrene resin, a polyvinyl chloride resin or a copolymer or mixture thereof, an unsaturated polyester resin, a melamine resin, an epoxy resin is used. Or a thermosetting resin such as (meth) acrylate resin such as urethane, (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, and triazine (meth) acrylate, or It is possible to use a copolymer or a mixture thereof, or a thermoformable material having a radically polymerizable unsaturated group.

Then, the material forming the hologram forming layer is coated on the support by a coating forming method such as a gravure coating method so as to have a thickness of several μm and dried to form a fine relief pattern forming a relief hologram. A hologram pattern is formed by heating and pressing a press plate manufactured on the hologram forming layer 3.

The hologram pattern may be a pattern which can be visually recognized by irradiation of white light, but a pattern which is readable by using monochromatic light of a specific wavelength is preferable from the viewpoint of fraud prevention. .

The invention described in claim 2 is based on the invention described in claim 1, and is characterized in that the hologram pattern is a laser beam reproduction hologram pattern.

The laser beam reproducing hologram pattern is a pattern which exhibits a hologram effect by entering a laser beam (monochromatic light), and more specifically, it is a pattern or a two-beam light beam which can visually confirm an image. A fine concavo-convex pattern composed of a diffraction grating (grating) formed by interference or electron beam (EB) can be given.
When the former pattern is a hologram, it is possible to visually judge whether it is true or false by projecting the reflected light directly or on a screen, and when the latter pattern is a hologram, the fine irregularities have a specific angle. Since the laser light incident at is reflected at a specific angle, it is possible to make a genuine / counterfeit judgment by detecting the presence / absence of reflection by the light receiving element.

Next, the reflective thin film layer 4 formed on the hologram forming layer 3 is a layer for reflecting incident light rays.
As a material for such a reflective thin film layer, metals such as aluminum, silver, gold and tin can be used. Since this thin film shines metallic color and is impermeable, it makes it very difficult to recognize that the following first brittle peeling layer 5 exists below the reflective thin film layer, and improves the fraud prevention. be able to.

However, the reflective thin film layer merely shines in a metallic color and is slightly inferior in decorativeness.

A third aspect of the present invention is based on the first and second aspects of the invention, and is characterized in that the reflective thin film layer is formed of a transmissive thin film having a refractive index different from that of the hologram forming layer. It is a thing.

Here, the transmissive thin film is a thin film which exhibits light transmissivity and causes light reflection at the interface due to the difference in refractive index from the hologram forming layer, and is used for reproducing a hologram image on the hologram forming surface. As the material for forming the transparent thin film, the hologram forming layer 3 (refractive index n = 1.3 to 1.
It is preferable that the refractive index is larger than that of 6) to improve the decorative property, and for example, the inorganic materials shown in Table 1 can be used.

[0019]

[Table 1]

As a method for forming such a transparent thin film, a film forming means such as a sputtering method or an ion plating method can be applied in addition to the vacuum vapor deposition method, and the film thickness is 10 nm to 1000 nm. It is preferably in the range.

According to this, the design and pattern of the base material, the image such as characters and the like, the color and the like can be visually observed together with the hologram, and the decorativeness can be further improved.

Some of such transparent thin films are colored and transparent, and light reflection occurs, so that the pattern formed by the first brittle peeling layer 5 and the adhesive layer described below becomes difficult to see.

Next, a first brittle peeling layer 5 formed so as to partially cover the reflective thin film layer 4 is provided. The first brittle peeling layer 5 is the interface between the first brittle peeling layer 5 and the reflective thin film layer 4 or the first brittle peeling layer 5 and the adhesive layer 6 when peeled after the hologram brittle seal is attached to an article. The interface is peeled off or the first brittle peeling layer 5 itself is peeled off between layers, and is formed by an offset printing method, a silk screen printing method or the like other than the gravure printing method. The first brittle peeling layer 5 is partially provided on the reflective thin film layer 4 and may be provided so as to show a message such as a character or a mark, and its shape is arbitrary.
It is necessary to be able to clearly determine that the hologram has been peeled off illegally.

As a material for forming such a first brittle peeling layer 5, an acrylic resin, a chlorinated rubber-based resin, a vinyl chloride-vinyl acetate copolymer having poor adhesion to the reflective thin film layer 4 or the adhesive layer 6 is used. Resins, cellulosic resins, chlorinated propylene resins, silicone resins and the like, resins in which silicone oil, fatty acid amide, zinc stearate are mixed, fragile resins in which a large amount of inorganic filler, etc. are mixed . A brittle resin containing a large amount of inorganic filler or the like has a slightly poor transparency,
The reflective thin film layer 4 is preferably not a transmissive thin film.

Next, an adhesive layer 6 for adhering to a base material or the like is formed on the first brittle peeling layer 5. The material forming the adhesive layer 6 is not particularly limited as long as it does not alter or affect the reflective thin film layer 4 and the first brittle peeling layer 5. For example, butyl rubber-based, natural rubber-based, silicone-based, polyisobutyl-based adhesive components, alkyl methacrylate, vinyl ester, acrylonitrile, styrene, vinyl monomer and other aggregation components, unsaturated carboxylic acids, hydroxyl group-containing monomers, A modifying component typified by acrylonitrile, a polymerization initiator, a plasticizer, a curing agent,
An adhesive to which additives such as a curing accelerator and an antioxidant are added as necessary can be applied.

The hologram brittle seal thus produced can be attached to various base materials via an adhesive layer.

FIG. 2 shows a state (a) attached to the surface of the base material 9 and a state (b) in which the hologram brittle seal 1 is broken when the hologram brittle seal 1 is forcibly peeled from the base material 9. It is shown schematically. In this case, peeling occurs between the reflective thin film layer 4 and the first brittle peeling layer 5, and a part of the peeled hologram remains on the peeling surface. Therefore, it becomes a state in which replacement is impossible.

By the way, the hologram brittle seal 1
However, although the hologram image formed by the hologram forming layer and the reflective thin film has a stereoscopic effect, there is a problem in that the viewing angle (viewing angle) is restricted and the decorativeness is slightly lacking.

The invention described in claim 4 is based on the invention described in claims 1 to 3, and is adhered to a support or a support and a hologram forming layer or a hologram forming layer and a reflective thin film layer or a reflective thin film layer. A printing layer is provided between the layers.

FIG. 3 is a sectional view showing a case where a printing layer 7 is provided between the hologram forming layer 3 and the reflective thin film layer 4. The printing layer 7 is formed by forming a known colored transparent or opaque ink by a known printing method before or after the press plate is heated and pressed onto the hologram forming layer 3. The printed layer 7 can be recognized from any angle without being restricted in viewing angle.

FIG. 4 shows the state (a) in which the hologram brittle seal 1 according to claim 4 is adhered to the surface of the base material 9 and the hologram brittle seal 1 when the hologram brittle seal 1 is peeled from the base material 9 is broken. The state (b) is shown schematically. In this case, peeling occurs between the reflective thin film layer 4 and the first brittle peeling layer 5, and the peeled hologram and a part of the printed layer remain on the peeled surface, and the state becomes impossible to replace.

FIG. 5 is a sectional view showing a case where the printing layer 7 is provided between the support 2 and the hologram forming layer 3.
The printing layer 7 is formed before the hologram forming layer 3 is formed. In this case as well, the hologram peeled off from the first brittle peeling layer portion and part of the peeled hologram remains on the peeled surface, and the hologram cannot be replaced.

FIG. 6 is a sectional view showing a case where a printing layer is provided on a support. In this case as well, the hologram is peeled between the reflective thin film layer 4 and the first brittle peeling layer, and a part of the peeled hologram remains on the peeling surface, which makes it impossible to replace the hologram.

When a printed layer is provided between the reflective thin film layer and the adhesive layer, the reflective thin film layer needs to be a transmissive thin film.

By the way, in the invention described in claims 1 to 4, whether the interface between the first brittle peeling layer 5 and the reflective thin film layer 4 or the interface between the first brittle peeling layer 5 and the adhesive layer 6 peels off,
Alternatively, it is preferable that the first brittle peeling layer 5 itself peels off the layer and a portion peels off between the support and the hologram forming layer.

The invention described in claim 5 is based on the invention described in claims 1 to 4, and is provided between the support and the hologram forming layer.
A second brittle peeling layer is provided.

7 and 9 are sectional views thereof. The second brittle peeling layer 8 is preferably formed so as to entirely cover the support 2. However, when the adhesive strength of the second brittle peeling layer to the support or the hologram forming layer is low, peeling occurs only between the support and the second brittle peeling layer or between the second brittle peeling layer and the hologram forming layer, and the reflective thin film layer. It may happen that peeling does not occur between the first brittle peeling layer. Therefore, the adhesive strength of the second brittle peeling layer 8 to the support 1 or the hologram forming layer 3 is equal to the reflective thin film layer 4 or the adhesive layer 6 of the first brittle peeling layer.
Or the first brittle release layer is second
It is preferable to provide a layer that can be peeled off with a force smaller than that of the brittle peeling layer. In order to adjust the adhesive strength and the like of the second brittle peeling layer, it suffices to increase the components that contribute to the improvement of the adhesive strength in the same material as the above-mentioned first brittle peeling layer.

8 and 10 show a state (a) in which the hologram brittle seal 1 according to claim 5 is attached to the surface of the base material 9 and the hologram brittle seal 1 when the hologram brittle seal 1 is peeled from the base material 9. 3B schematically shows a state (b) in which the element is destroyed. In this case, peeling occurs between the reflective thin film layer 4 and the first brittle peeling layer 5 and between the support and the second brittle peeling layer 8,
The peeled hologram and a part of the printed layer remain,
It becomes impossible to replace.

Providing such a second brittle peeling layer is particularly effective when the adhesive strength between the support and the hologram forming layer is high.

[0040]

According to the first aspect of the present invention, by forming the first brittle peeling layer on the lower surface of the reflective thin film layer, it is difficult to recognize its existence from the outside after sticking the seal, and it is intentional. Partial brittle fracture occurs in the hologram upon delamination. In addition, the hologram reproduced image is not affected by the presence of the first brittle peeling layer, and the tamperproof property can be improved.

According to the second aspect of the present invention, since the machine reading accuracy is high, it is possible to further improve the fraud prevention property.

According to the third aspect of the present invention, the reflective thin film layer is a transmissive thin film layer having a refractive index different from that of the hologram forming layer, thereby designing the base of the adherend,
The decorativeness can be further improved without impairing the image and color of patterns, characters, etc., and fraud prevention is also high.

According to the fourth aspect of the invention, in addition to the effect that the formation of the printing layer enhances the decorative property, it is partially destroyed by peeling like the hologram, so that the tamperproof property is improved. be able to.

According to the fifth aspect of the present invention, the support and the hologram forming layer can be easily peeled off, and the tamperproof property of the hologram brittle seal is improved.

[0045]

Embodiments of the present invention will be described below with reference to the drawings.

[Example 1] A hologram-forming layer composition having the following compounding ratio was applied to a support made of a polyethylene terephthalate film having a thickness of 25 µm by a gravure coating method and dried at 110 ° C to give a thickness of 1 A hologram forming layer having a thickness of 0.0 μm was formed.

(Composition for hologram forming layer) Acrylic polyol resin 250 parts Nitrocellulose resin 50 parts Xylene diisocyanate (XDI) 50 parts Isobutyl acetate 200 parts Methyl ethyl ketone 200 parts Toluene 250 parts

Next, a press plate made of nickel on which a fine uneven pattern having a diffraction grating (grating) shape formed by an electron beam (EB) is formed is a hologram forming layer 3.
The press surface was heated and pressed at a plate surface temperature of 155 ° C.

Next, as a reflective thin film layer, a thickness of 100 n
m of Al was formed by a vacuum evaporation method.

Further, printing is performed on the reflective thin film layer so as to partially cover the composition for forming the first brittle peeling layer having the following composition, 11
It was dried at 0 ° C. to form a first brittle peeling layer having a thickness of 0.5 μm.

(First Brittle Release Layer Forming Composition) Acrylic resin 30 parts Toluene 40 parts Methyl ethyl ketone 40 parts Methyl isobutyl ketone 20 parts

As the adhesive layer 6, an adhesive layer-forming composition having the following compounding ratio was used at a drying temperature of 11 by a gravure method.
It was formed at 0 ° C. and a thickness of 20 μm.

(Composition for forming adhesive layer) Acrylic adhesive 30 parts Methyl ethyl ketone 50 parts Toluene 50 parts

The hologram brittle seal produced in the above steps was attached to a substrate. Then, when the hologram brittle seal was peeled off using the support as a clue,
The hologram peeled off from the brittle peeling layer, and a part of the peeled hologram remained on the peeled surface, which made it impossible to replace the hologram.

[Example 2] In Example 1, after forming the hologram forming layer and pressing by heat molding, an ink having the following composition was dried by a gravure printing method at a drying temperature of 110 ° C and a thickness of 1.0.
A printed layer consisting of μm alphabetic characters was formed.
The other steps are the same as in Example 1.

(Ink composition) Polyester resin 25 parts Carbon black 8 parts Methyl ethyl ketone 70 parts Toluene 30 parts

The hologram brittle seal produced by the above-mentioned steps was attached to a substrate. Then, when the hologram brittle seal was peeled off using the support as a clue,
The hologram peeled off from the brittle peeling layer, and a part of the peeled hologram remained on the peeled surface, which made it impossible to replace the hologram.

Example 3 In Example 1, ZnS was used to form a reflective thin film layer having a thickness of 50 nm. This reflective thin film layer exhibited light transmittance and caused light reflection at the interface due to the difference in refractive index from the hologram forming layer to reproduce the hologram image on the hologram forming surface. The reproduction of the hologram was visually observable along with the design and pattern of the base material, images such as characters and colors. Note that ZnS was slightly colored (colored and transparent), and the first brittle peeling layer as the lower layer was inconspicuous.

Example 4 A support made of a polyethylene terephthalate film was used, and a second support having the following compounding ratio was used.
Printing the brittle release layer forming composition so as to cover the entire surface,
It was dried at 110 ° C. to form a second brittle peeling layer having a thickness of 1.5 μm.

(Second Brittle Release Layer Forming Composition) Acrylic resin 28 parts Polyester resin 2 parts Toluene 40 parts Methyl ethyl ketone 40 parts Methyl isobutyl ketone 20 parts

Next, a hologram forming layer composition having the following compounding ratio was applied by a gravure coating method at 110 ° C.
And dried to form a hologram forming layer having a thickness of 1.0 μm. Others are the same as in the first embodiment.

(Composition for hologram forming layer) Vinyl chloride-vinyl acetate copolymer 25 parts Urethane resin 10 parts Methyl ethyl ketone 70 parts Toluene 30 parts

The hologram brittle seal produced in the above steps was attached to a substrate. Then, when the hologram brittle seal was peeled off using the support as a clue,
The hologram was peeled off by the brittle peeling layer and the second brittle peeling layer, and a part of the peeled hologram remained on the peeled surface, which made it impossible to replace the hologram.

[0064]

As described above, according to the present invention, after the hologram brittle seal is attached, a layer that provides a partial brittle effect even when viewed from the surface of the seal is provided under the reflective thin film layer. , It can be very difficult to recognize its existence, and fraud prevention can be improved.

Further, by designing the reflective thin film layer as a transmissive thin film layer having a refractive index different from that of the hologram forming layer, the design, pattern, image and color of letters, etc. of the base of the article (adherend) The decorativeness can be further improved without impairing the above.

Further, by providing the printing layer, the decorative property can be enhanced, and the peeling action can be partially destroyed similarly to the hologram, thereby further improving the fraud prevention property. .

Furthermore, by providing the second brittle peeling layer, peeling of the support and the hologram forming layer is facilitated,
The tamperproof property of the hologram brittle seal is improved.

[0068]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a hologram brittle seal according to claim 1.

FIG. 2 is a cross-sectional view showing a state before and after peeling off the hologram brittle seal according to claim 1.

FIG. 3 is a cross-sectional view showing a configuration of a hologram brittle seal according to claim 4.

FIG. 4 is a cross-sectional view showing a state before and after peeling of a hologram brittle seal according to claim 4.

FIG. 5 is a cross-sectional view showing another configuration of the hologram brittle seal according to claim 4.

FIG. 6 is a cross-sectional view showing another configuration of the hologram brittle seal according to claim 4.

FIG. 7 is a cross-sectional view showing the structure of a hologram brittle seal according to claim 5;

FIG. 8 is a cross-sectional view showing a state before and after peeling of a hologram brittle seal according to claim 5;

FIG. 9 is a cross-sectional view showing another configuration of the hologram brittle seal according to claim 5;

FIG. 10 is a cross-sectional view showing a state before and after peeling of the hologram brittle seal according to claim 5;

[Explanation of symbols]

 1 Hologram Brittle Seal 2 Support 3 Hologram Forming Layer 4 Reflective Thin Film Layer 5 First Brittle Release Layer 6 Adhesive Layer 7 Printing Layer 8 Second Brittle Release Layer 9 Base Material

Front page continued (72) Inventor Kazuhisa Hoshino 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Takashi Sato 1-1-5 Taito, Taito-ku, Tokyo Toppan Printing Stocks In the company

Claims (5)

[Claims] 1. A support, a hologram forming layer having a hologram pattern, a reflective thin film layer, a first brittle peeling layer that partially covers the reflective thin film layer, and an adhesive layer are sequentially provided. Holographic brittle seal. 2. The hologram brittle seal according to claim 1, wherein the hologram pattern is a laser beam reproduction hologram pattern. 3. The hologram brittle seal according to claim 1, wherein the reflective thin film layer comprises a transmissive thin film having a refractive index different from that of the hologram forming layer. 4. A hologram according to claim 1, wherein a printing layer is provided on the support or between the support and the hologram forming layer or between the hologram forming layer and the reflective thin film layer or between the reflective thin film layer and the adhesive layer. Brittle seal. 5. The hologram brittle seal according to claim 1, wherein a second brittle peeling layer is provided between the support and the hologram forming layer.