JPH0745100Y2 - Colored hologram transfer sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a colored hologram transfer sheet which is colored in any color and has an appearance suitable for the intended use.

[Conventional technology]

Holograms can reproduce three-dimensional images by utilizing light interference, and because they require advanced technology for manufacturing, they are provided as part of anti-counterfeiting measures on credit cards or have a novel appearance. Aiming at magazine covers, book covers such as books, brochures, calendars, record jackets,
Attempts have been made to install it on paper / plastic packages, clothing, and the like.

[Problems to be solved by the device]

In many cases, as a hologram, a colorless and transparent synthetic resin film provided with a minute concavo-convex shape by an embossing method and a light-reflecting metal layer provided as a light-reflecting layer is used. The overall color is determined by the light-reflecting metal layer, and since aluminum is usually used as the light-reflecting metal layer, it is limited to silver gray, so it may not match the surrounding colors depending on the place of use. There were many. Therefore, in an attempt to colorize the hologram, a volume hologram was formed and the wavelength selectivity at the time of reproduction was used, but it was difficult to reproduce two or more colors with this type. .

The present invention has been made in view of the above circumstances, and is capable of mass copying and has an appropriate color tone according to the application,
It is an object of the present invention to provide a colored hologram transfer sheet that matches the color tone around the part to be used and can be easily adhered to various articles as needed.

[Means for Solving the Problems]

Therefore, as a result of intensive research to solve the above-mentioned problems of the prior art, it was found that at least a part of the volume hologram layer is transparently colored to solve the problems of the prior art. Then the present invention was completed.

That is, the colored hologram transfer sheet of the present invention comprises a release sheet, a volume hologram layer provided on the release sheet, and an adhesive layer, and at least a part of the volume hologram layer is transparently colored. It is characterized by that.

The present invention will now be described in more detail with reference to the accompanying drawings.

FIG. 1 shows the basic structure of a colored hologram transfer sheet of the present invention, which is an example in which the volume hologram layer is wholly or partially colored. The volume hologram layer may be colored in two or more colors.

FIG. 2 shows an example in which a translucent protective layer and / or a peeling layer are provided in the example of FIG.

FIG. 3 schematically shows a method of transferring the hologram transfer sheet shown in FIG. 1 to any transfer target material.

First, FIG. 1 will be described in detail.

In the figure, the volume hologram layer 3 made of a photosensitive resin provided on the release sheet 1 is light-transparently colored as described later. The volume hologram layer 3 may be colored in multiple layers, or may be divided into multiple colors and colored.

The release sheet 1 is one in which a volume hologram layer is formed on this, a laser beam is irradiated to form a volume hologram, and the volume hologram is transferred, and then peeled off. Any known material may be used as long as it is a transparent sheet material having a releasability to such an extent that it can be easily and releasably adhered to the layer and / or the release layer 2, for example, polyethylene terephthalate, polypropylene,
Plastic films such as polyethylene and poroamide,
Releasable films obtained by applying a release agent to these films, and those obtained by subjecting these films to silicon treatment can be used. The thickness of the release sheet 1 is not particularly limited as long as it has appropriate strength and heat resistance.

The volume hologram layer 3 is preferably colored with a dye or a pigment, and examples of the dye that can be used include various dyes described below.

Direct dyes, acid dyes, basic dyes, mordant dyes, vat dyes, sulfur dyes, soluble vat dyes, azoic dyes, reactive dyes, cationic dyes, disperse dyes, oxidation dyes, metal complex dyes, etc.

Light enters the volume hologram layer 3, is reflected in the layer, and is emitted again. Therefore, light is transmitted through the volume hologram layer 3 twice. It is desirable that the light transmittance of the layer 3 is not lowered so much and the layer 3 is not clouded. Since the light transmittance varies depending on the thickness of the layer 3, the white light transmittance of the layer 3 is preferably 50% or more, and the haze value measured by a haze meter is preferably 10% or less. If the white light transmittance is less than 50%, the hologram will not be clearly visible and the stereoscopic effect will be poor, and the haze meter will give a haze value of 10 or less.
If it exceeds%, the background of the hologram will be clouded in milky white,
After all, the clarity of the hologram is lost and the stereoscopic effect becomes poor.

Further, depending on the application of the colored hologram transfer sheet, for example, a dye in consideration of various physical properties such as chemical resistance, solvent resistance, plasticizer resistance and washing fastness if it is applied to cards, clothes, stationery, etc. Is preferably used.

Considering various practical conditions as described above, the dye is preferably in the form of an oil-soluble metal complex salt, for example,
Examples thereof include 1-2 type azo metal complex salt dyes, 1-1 type azo metal complex salt dyes, metal phthalocyanine type dyes, and organic base salts of these dyes. More specifically, they are as follows. .

Bali First Yellow # 3104 and # 3105 (both manufactured by Orient Chemical Industry Co., Ltd.), Zabon First Yellow
GR (manufactured by BASF), Eisenspiron Yellow GRH and G
RH Special (both manufactured by Hodogaya Chemical Co., Ltd.), Aizen Metallon Yellow HNRS (manufactured by Hodogaya Chemical Co., Ltd.), Orazol Yellow II GLN (manufactured by Ciba Gay Key Co., Ltd.), Varifast Orange # 3206 (manufactured by Orient Chemical Industry Co., Ltd.), Zabon First Orange RE, G and RR (all manufactured by BAS),
Aizespiron Orange GRH and 2RH (Hodogaya Chemical Co., Ltd.), Bali Fast Red # 3304 and # 3305 (Orient Chemical Co., Ltd.), Neo-Zabone Red GE and Zabone Fast Red GE (both from BASF), Aizen Spice Ron Red BEH, GEH and GEH Special (Hodogaya Chemical Co., Ltd.), Orazol Red IIBL (Ciba Gay Key Co., Ltd.), Aizen Spyron Violet RH (Hodogaya Chemical Co., Ltd.), Zabong First Blue HFL and Zabon First Brown BE (any. Also made by BASF) etc.

Further, the pigment used for coloring the volume hologram layer 3 is
It is roughly divided into organic pigments and inorganic pigments. (1) Neutral type pigments such as nitro pigments, azo pigments, anthraquinone pigments, phthalocyanine pigments, azine pigments, etc. (2) Cationic type pigments Fanylmethane pigments, xanthene pigments, etc. (3) Anionic pigments, for example, azo pigments, triphenylmethane pigments, and the like, and those belonging to the category of inorganic pigments are cobalt pigments, iron pigments. Pigments, chromium-based pigments, manganese-based pigments, copper-based pigments, vanadium-based pigments, mercury-based pigments, lead-based pigments, sulfide-based pigments, selenide-based pigments and the like.

As with dyes, it is necessary to pay attention to various properties such as light transmittance, haze value, discoloration upon heating, chemical resistance, plasticizer resistance, and fastness to washing of the above pigments.

Especially when using a pigment, translucency generally tends to be a problem, and it is necessary to consider the particle size of the pigment, wetting of the surrounding synthetic resin, and dispersion. Deteriorates, and wetting and clouding occur when dispersion is poor. In these meanings, the particle size of the pigment is very small, preferably 1/2 or less of the wavelength of light, and the pigment is made to a synthetic resin to a high concentration by coprecipitation method, roll milling, extruding, etc. It is preferable to use a masterbatch, a master pellet, or the like that has been dispersed, wetted, and improved in dispersion. Examples of pigments having improved wettability and dispersion include, for example, Sicotrans Yellow manufactured by Taisei Kako Co., Ltd. (fine iron oxide particles (major axis 0.06 μm, minor axis 0.02 μm) sold as BACO Shikotrans L-2715D). And the HF chip 4B (a nitrified cotton chip pigment of an insoluble azo dye) manufactured by Taisei Kako Co., Ltd.).

Various materials can be used as the volume hologram recording material colored with the above-mentioned dye or pigment, and any material can be used as long as it can record interference fringes of light as a modulation of density, density, refractive index and the like. As the recording material, known volume hologram recording materials such as silver halide-zetilan emulsion, dichromate gelatin emulsion, dichromate casein emulsion and photopolymer can be used.

The colored hologram layer 3 has a thickness of 0.1 to 100 μm, preferably 0.5 to 20 μm.

An adhesive layer 4 is formed on the surface of the volume hologram 3, and the adhesive layer 4 is formed of any adhesive material that can adhere the hologram sheet to other articles. Good.

FIG. 1 shows a preferable example of the heat-sensitive adhesive as the adhesive layer 4.

As a preferable heat-sensitive adhesive for forming the adhesive layer 4, any of the adhesives used in conventionally known transfer sheets can be used. For example, polyisoprene rubber, polyisobutyl rubber, styrene butadiene rubber, butadiene acrylonitrile rubber. Rubber resin such as, (meth) acrylic ester resin, polyvinyl ether resin, polyvinyl acetate resin, vinyl chloride vinyl acetate copolymer resin, polystyrene resin, polyester resin, polyamide resin, polychlorination Any adhesive such as an olefin resin or a polyvinyl butyral resin can be used, and if necessary, various additives such as a softening agent, a filler and an antiaging agent can be added. All such adhesives are commercially available and can be easily used.

If necessary, an organic solvent may be added to such an adhesive to adjust the viscosity, and the surface of the volume hologram layer 3 may be coated by a conventional coating method such as roll coating, die coating, knife coating, or gravure coating. The adhesive layer 4 is formed by coating. The adhesive layer 4 thus formed may have any thickness, but it is generally desirable to form the adhesive layer 4 to a thickness corresponding to about 10 to 50 g / m ² (solid content). In this way, the colored hologram transfer sheet 20 of the present invention is completed.

Next, an example of a preferred method for manufacturing the colored hologram transfer sheet of the present invention will be described with reference to FIG.

First, the volume hologram layer 3 is formed on a suitable release sheet 1 with a protective layer and / or a release layer (not shown) according to need. For this purpose, it is preferable to apply the above-mentioned dye or pigment and the solvent for the light-sensitive material, or to apply a mixture by heating and melting to form a coating composition by an appropriate method. Next, the hologram master is brought into close contact with the surface of the volume hologram layer 3 on the release sheet 1 and exposed and developed to transfer the interference fringes of the hologram master.

Next, the hologram transfer sheet of the present invention is prepared by providing the adhesive layer 4 as described above on the surface of the volume hologram layer 3.
20 is completed.

Next, referring to FIG. 2, what is schematically shown in FIG. 2 is that the transparent protective layer 2 is provided between the hologram layer 3 and the release sheet 1 of the colored hologram transfer sheet 20 of FIG. This is an example provided.

In this example, the protective layer 2 is transparently colored. The protective layer 2 may be uncolored and the hologram layer 3 may be colored, or both the hologram layer 3 and the protective layer 2 may be colored.

The protective layer 2 protects the hologram layer after transfer,
It improves the releasability between the release sheet 1 and the hologram layer 3 at the time of transfer, and can be regarded as a release layer if importance is attached to the releasability. Of course, both the protective layer and the peeling layer may be provided.

As such a protective layer and / or a peeling layer, any material can be used as long as it is a material that is sufficiently translucent.
Cellulosic resin, (meth) acrylic ester resin, vinyl chloride resin, vinyl acetate resin, urethane resin, melamine resin, polyester resin, etc.
It may be a layer formed by various coating methods from a paint made of a mixture, a copolymer or the like, and a resin to which various additives are added. The thickness of these protective layers 2 is preferably 0.05 to 10 μm, more preferably 0.1 to 5 μm. The protective layer 2 can be colored in a light-transmitting manner by a conventional method using the dye or pigment as described above.

The photosensitive adhesive layer, which is the adhesive layer 4, is formed of a conventionally known photosensitive adhesive, that is, a resin that does not exhibit tackiness at room temperature but that exhibits tackiness when heated.

The example shown in FIG. 3 is a schematic illustration of a method of transferring a hologram layer to a transfer target material 5 using the hologram transfer sheet 20 of the example shown in FIG. The hologram layer can be transferred to the transferred material 5 by pressing 20 onto the transferred material 5 with the heating roll 6 and then peeling off the release sheet 1.

As the transferred material 5, plastic molded products, woven fabric, paper,
Although any article such as metal, wood, glass, ceramics and the like can be used, it is natural that the adhesive forming the adhesive layer 4 is appropriately selected according to the material of the transferred material 5. The various transfer conditions are the same as in the prior art, but a transfer temperature high enough to deteriorate the interference fringes of the volume hologram must be avoided.

The above are preferred examples of the colored hologram transfer sheet of the present invention, but in these examples and other examples not shown,
When the protective layer 2, the volume hologram layer 3, and the adhesive layer 4 are laminated during the production, an anchor layer (not shown) may be provided as necessary to improve the adhesive force between these layers.

As the anchor layer, those conventionally known as anchor layers such as vinyl chloride-vinyl acetate copolymer, acrylic resin, urethane resin, epoxy resin, polyester resin can be widely used. The thickness of this anchor layer is 0.
The thickness is 02 to 10 μm, preferably 0.2 to 2 μm.

[Action]

The hologram transfer sheet of the present invention and the volume hologram layer and / or the protective layer on which the interference fringes of the hologram are formed are transparently colored in advance so that a large amount of duplication is possible and an appropriate color tone according to the application is provided. By matching the color tone around the portion to be applied and used and making the recording position unclear by coloring, the anti-counterfeiting effect can be enhanced, and moreover, it can be easily adhered to various articles if necessary.

〔Example〕

 Examples will be described below.

A polyethylene terephthalate film having a thickness of 50 μm as a release sheet, and 3 parts by weight of a metal-containing blue dye (Zapon Fast Blue HFL, manufactured by BASF) dissolved in 100 parts by weight of trimethicol propane acrylate as a colored protective layer, have a thickness of To 2 μm, 80W /
At a position of 10 cm under a mercury lamp, the resin was passed and cured at a speed of 2 m / min. 20 μm of gelatin (made by Nitta Gelatin Co., Ltd.) on the surface
It was applied thickly, dried and then immersed in a 5% ammonium dichromate aqueous solution for 10 minutes and dried to form a volume hologram layer.
After that, a volume hologram master plate was brought into close contact with the surface, and optical duplication was performed using Ar laser light. After development, an acrylic adhesive (Acrynal # 3000 acrylic resin manufactured by Toei Kasei Co., Ltd.) as an adhesive layer was applied on the surface to a thickness of 5 μm to prepare a transfer sheet.

[Effect of device]

As described above, according to the present invention, the hologram transfer sheet has the following effects because the volume hologram layer and / or the protective layer in which the interference fringes of the hologram are formed are already colored.

(1) The hologram transfer sheet can have an arbitrary color tone, and the hologram transfer sheet can be in harmony with the surrounding color tone in which it is used.

(2) The production itself can be efficiently performed in large quantities using existing coating equipment, shaping equipment, and developing equipment.

(3) Forgery can be made technically difficult by attaching the colored hologram transfer sheet of the present invention to an ID card, a cash voucher, and the like, and the color tone of the colored hologram transfer sheet, the card, and the cash voucher. By making the color tone of the base material such as, for example, the coloring position of the colored hologram transfer sheet unclear, the image of the laser reproduction hologram such as the Fresnel hologram recorded in the colored hologram transfer sheet becomes recording noise. Even if the remaining recording position is implied, coloring can make the recording position unclear and enhance the forgery prevention effect.

(4) And the colored hologram transfer sheet as described above,
It can be easily attached to and peeled from various articles immediately if necessary.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic structure of a colored hologram transfer sheet of the present invention, FIG. 2 is a diagram showing an example in which a light-transmitting protective layer and / or a peeling layer are provided in the example of FIG. 1, and FIG. FIG. 4 is a diagram for explaining a method of transferring the hologram transfer sheet shown in FIG. 1 to an arbitrary transfer target material. 1 ... Release sheet, 2 ... Protective layer and / or release layer, 3 ... Volume hologram layer, 4 ... Adhesive layer, 5 ...
Material to be transferred, 6 ... Heating roll, 20 ... Colored hologram transfer sheet.

Claims (6)

[Scope of utility model registration request] 1. A release sheet, a volume hologram layer and an adhesive layer provided on the release sheet, wherein at least a part of the volume hologram layer has a white light transmittance of 50% or more and a haze meter measured haze value of 10%. A colored hologram transfer sheet characterized by being colored below. 2. The transfer sheet according to claim 1, wherein a white light transmittance of 50% or more is provided between the release sheet and the volume hologram layer.
Haze meter measurement A colored hologram transfer sheet provided with a protective layer and / or a peeling layer colored to have a haze value of 10% or less. 3. The colored hologram transfer sheet according to claim 1 or 2, wherein a pigment having a particle diameter of 1/2 or less of a wavelength of light is used for the coloring. 4. The colored hologram transfer sheet according to claim 1, wherein a dye in the form of an oil-soluble metal complex salt is used for the coloring. 5. The colored hologram transfer sheet according to claim 1, wherein the adhesive layer is a heat-sensitive adhesive layer. 6. A colored hologram transfer sheet according to any one of claims 1 to 5, wherein an anchor layer is provided on at least one of the layers when laminating the layers.