JP2000206884A - Hologram label to be pasted onto back side and hologram laminated body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hologram label suitable to be observed from the front face side by arranging a transparent adhesive layer in front of the hologram layer so as to paste the hologram label to the back face of the objective body and laminating a suppressing layer of transmission of light to suppress transmission of visible rays on the back of the hologram layer to prevent reflection of light. SOLUTION: A transparent adhesive layer 3 to adhere the label to the objective body is laminated on the under face of the hologram layer 2 comprising a polymer or the like having diffraction gratings of a hologram. A suppressing layer 1 for transmission of light which suppresses transmission of visible rays is laminated on the upper face of the hologram layer 2 so as to improve the visual contrast of an hologram image when the image is observed through the transparent adhesive layer 3. When this hologram label is pasted to the back side of a transparent objective body, layers from the hologram layer to the observer is transparent and the suppressing layer 1 for transmission of light is present on the opposite side of the hologram layer, so that high visibility of the hologram image is obtd. without influenced by the light from the opposite side when the label is observed from the front side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an article made of a transparent substrate such as a plastic film, sheet or plate, or glass, or an article having such a transparent substrate as a part thereof. A hologram label for backing, suitable for observing from the side opposite to the pasting,
The present invention relates to a hologram laminate to which such a back-side hologram label is attached.

[0002]

2. Description of the Related Art Holograms are difficult to forge and falsify.
Items that have a monetary value, such as cash vouchers or securities, items that need to be verified as genuine, such as identification cards or credit cards, or expensive items such as luxury watches or cosmetic boxes for those items The product is attached as a hologram label to products that need to prove that the product is genuine.

As a hologram label to be attached for such a purpose, a transparent polyester film, a transparent adhesive, a polymer hologram layer, a transparent adhesive, a transparent polyester film, a pressure-sensitive adhesive layer, and a release sheet are laminated in this order. Can be exemplified. Of this type,
It is suitable for use in applications such as identification cards or credit cards, which are pasted on the photograph of the owner of a so-called ID card to prevent re-pasting.

When the hologram label is peeled off, the entirety of the hologram label is transparent, so that the visibility of the hologram image is poor as it is. However, when the hologram label is attached to an ID card, the object to be attached is colored. The hologram is easy to recognize because it is light-shielding. However, if this hologram label is affixed to a transparent plate such as a glass plate or an acrylic plate, it is difficult to see because the visibility is poor. In addition, since the hologram label is attached to the front side of the target article, if the hologram label is applied for a long time, the adhesive strength may be reduced and the hologram label may be spontaneously peeled off. In addition, since it is attached to the front side, it may be peeled off for the purpose of forgery or falsification. Therefore, when applied to the back side of the transparent plate, spontaneous peeling and peeling can be somewhat improved, but visibility from the front side is still insufficient. Therefore, the above-mentioned conventional hologram label cannot be used such that the hologram label is attached to a transparent plate or the like from the back side and viewed from the front side.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hologram label for back bonding which is suitable for being attached to a transparent object to be attached from the back side and observing from the front side.

[0006]

In the present invention, a transparent pressure-sensitive adhesive layer is arranged in front of the hologram layer so as to be adhered from the back side, and visible light is applied to the other side of the hologram layer to prevent reflection of light. The problem was solved by laminating a light transmission suppressing layer for suppressing transmission.

According to a first aspect of the present invention, a transparent pressure-sensitive adhesive layer for adhesion to an adherend is laminated on one surface of a hologram layer having a built-in hologram diffraction grating, and the other side of the hologram layer is provided. The present invention relates to a backing hologram label on which a light transmission suppressing layer for suppressing transmission of visible light is laminated on a surface so as to improve visual contrast of a hologram image when viewed from the transparent pressure-sensitive adhesive layer side. .

[0008] The invention of claim 2 relates to the hologram label for backing, wherein the hologram layer and the light transmission control layer are laminated via a transparent pressure-sensitive adhesive layer.

A third aspect of the present invention is the backing hologram label according to the first or second aspect, wherein the hologram layer and a transparent pressure-sensitive adhesive layer for adhesion to an adherend are laminated via a transparent reinforcing layer. It is about.

[0010] The invention of claim 4 relates to the hologram label for backing according to claim 3, wherein the hologram layer and the transparent reinforcing layer are laminated via a transparent pressure-sensitive adhesive layer.

A fifth aspect of the present invention is the backing adhesive according to any one of the first to fourth aspects, wherein a release sheet is laminated on an exposed surface of the transparent pressure-sensitive adhesive layer for adhesion to an adherend. It relates to a hologram label.

According to a sixth aspect of the present invention, the backing hologram label according to any one of the first to fourth aspects is laminated on the back surface of the transparent substrate via a transparent pressure-sensitive adhesive layer for adhesion to an adherend. Hologram laminate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 are sectional views showing the structure of an embodiment of a backing hologram label of the present invention.
FIG. 7 is a sectional view of an embodiment of the hologram laminate of the present invention. Explaining with reference to FIG. 1, the hologram label for backing according to the present invention essentially has a built-in diffraction grating for hologram, and is attached to the lower surface of a hologram layer 2 made of, for example, a polymer. The transparent adhesive layer 3 is laminated on the hologram layer 2 and the transparent adhesive layer 3
It has a structure in which a light transmission suppression layer 1 that suppresses transmission of visible light is stacked in order to improve the visual contrast of a hologram image when viewed from the side.

The backing hologram label of the present invention can be variously modified as described below. For example, as shown in FIG. 2, the lamination of the light transmission suppressing layer 1 and the hologram layer 2 may be performed not directly but via the transparent pressure-sensitive adhesive layer 4a. Further, as shown in FIGS. 3 and 4, the hologram layer 2 and the transparent pressure-sensitive adhesive layer 3
It may be performed not directly but via the transparent reinforcing layer 5.

In FIGS. 3 and 4, the hologram layer 2 and the transparent pressure-sensitive adhesive layer 3 are laminated via the transparent reinforcement layer 5, but in each case, the hologram layer 2 and the transparent reinforcement layer 5 are laminated. The lamination with the layer 5 may be performed not directly but via the transparent pressure-sensitive adhesive layer 4b. FIG. 5 shows the structure of FIG. 3 with the transparent pressure-sensitive adhesive layer 4b interposed therebetween.
Can be similarly laminated between the hologram layer 2 and the transparent reinforcing layer 5 via a transparent pressure-sensitive adhesive layer. The various modifications described above can be performed alone or in combination.

FIG. 6 is a view showing a structure in which a release sheet 6 is laminated on the exposed surface of the pressure-sensitive adhesive layer 3. The form sheets may be laminated. It is easier to use the backing hologram label when laminating the release sheet, but the backing hologram label of the present invention is rolled up and stored in a long length, or when it is stored in piles. When the exposed surface of the light transmission suppressing layer 1 has releasability, the lamination of the releasable sheet can be omitted.

FIG. 7 shows a hologram laminate of the present invention in which the above-mentioned hologram label for backing is laminated such that the transparent adhesive layer 3 side of the hologram label is in contact with the transparent substrate 7. FIG. 7 shows an example in which the backing hologram label having the structure shown in FIG. 1 is stuck, but a backing hologram label having another structure may be stuck.

Each of the above-described layers will be described. The light transmission suppressing layer 1 is for applying the backing hologram label of the present invention to a transparent substrate and improving the visual contrast of a hologram image when viewed from the transparent substrate side. In the state of a hologram label for backing, when a release sheet is accompanied, the visual contrast of the hologram image is reduced when viewed from the transparent adhesive layer 3 side even when the release sheet is peeled off. It must improve. Further, since it is necessary to view the hologram image of the hologram layer 2 with the light from the transparent adhesive layer 4 side and to shield the transmission of light from the opposite side, the optical transmission density of the light transmission suppression layer 1 is reduced. Is 1.5 or more, preferably 1.9
The above are preferred. Further, the light having the diffraction wavelength of the hologram of the hologram layer 2 described below is reduced to 50% or more, preferably 80% or more.
% Or more is preferable. Further, it is preferable to use not only a light-blocking type but also a dark color type in terms of lightness. Therefore, black or dark colors such as blue, purple, and brown are preferable. However, when it is stuck from the inside to something like a glass window, a dark color appears and stands out from the inside when viewed from the inside. Therefore, the exposed surface (the upper surface in the figure) of the light transmission suppressing layer 1 is appropriately adjusted. It may be less noticeable to coat with a high-brightness color, a metallic color or the like, or a light-colored coating or sheet, or to provide a pattern on the coating or sheet.

The light transmission suppressing layer 1 is specifically a colored plastic film or a colored coating film. As a colored plastic film, a plastic film coated with a paint appropriately colored with a pigment or a dye,
A plastic film dyed with a dye can be used. Further, a coating film obtained by coating a paint colored with a dye or a pigment may be used. When using a dye,
When the layer containing the dye directly contacts the hologram layer,
A dye that does not migrate should be selected for the hologram layer 2 described below. However, even when a dye that migrates is used, a layer such as a polyvinyl alcohol resin or an ethylene-vinyl alcohol copolymer resin may be used as the hologram layer and the hologram layer. If provided between layers 2, migration can be prevented. In the above, as the dye, acid black, chrome black,
A mixture of dyes such as black dyes such as reactive black, disperse red, cationic blue and cationic yellow, or dyes having relatively low lightness can be used alone. As pigments, carbon black, copper-
Black pigments such as iron-manganese and aniline black, and pigments such as naphthol red and phthalosinin blue can be used alone or in combination.

When the light transmission suppressing layer 1 is formed by laminating a colored plastic film, the plastic film may be a polyethylene film, a polypropylene film, a polyethylene fluoride film, a polyvinylidene fluoride film, a polyvinyl chloride film, a polyvinylidene chloride film. Polyester films such as ethylene-vinyl alcohol film, polyvinyl alcohol film, polymethyl methacrylate film, polyether sulfone film, polyether ether ketone film, polyamide film, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer film, and polyethylene terephthalate film , It is good to use a polyimide film, etc., as the thickness of these plastic films 2μm~200μm, preferably, it is a 10μm~50μm.

The colored plastic film may be subjected to a hard coat treatment, if necessary, for the purpose of enhancing the surface protection function. The hard coat treatment is, for example, coating a silicone-based, fluorine-containing silicone-based, melamine alkyd-based, urethane-acrylate-based (ultraviolet curable) or the like to a film thickness of 1 μm to 50 μm by a dipping method, a spray method, a roll coating method, or the like. Good to do.
A release treatment may be performed on the colored plastic film or on the hard coat treated surface as described above.
In the release treatment, a fluorine-based release agent, a silicone-based release agent, a stearic acid-based release agent, a wax-based release agent, or the like may be applied by a dipping method, a spray method, a roll coating method, or the like.

The hologram layer 2 is preferably what is called a volume hologram. The volume hologram is obtained by recording interference light between object light and reference light on a photosensitive material sufficiently thicker than the interval between interference fringes. The three-dimensional structure of the object is recorded as it is. In order to form this volume hologram, the interference light between the object light and the reference light is recorded directly on the laminated material of the volume hologram forming material on the support film, or the original volume hologram is adhered. It is obtained by copying by exposure, and industrially by the latter method.

In the following, materials for forming a volume hologram and a method of forming the same will be described in detail. The support film to be coated with the volume hologram forming material has a thickness of 1 μm.
A polyethylene terephthalate film, a polyethylene film, a polypropylene film, a polyvinyl chloride film, an acrylic film, a triacetylcellulose film, a cellulose acetate butyrate film having a thickness of m to 1 mm, preferably 10 μm to 100 μm is used. It is desirable to use a film having high transparency and high smoothness as the support film.

Generally, the hologram-forming material includes:
Known volume hologram recording materials such as a silver salt material, a dichromated gelatin emulsion, a photopolymerizable resin, and a photocrosslinkable resin may be mentioned.In the volume hologram of the present invention, a matrix polymer, It is preferable to use, as a material for forming a volume hologram, a photosensitive material for dry volume phase hologram recording, which comprises a photopolymerizable compound, a photopolymerization initiator, and a sensitizing dye.

Examples of the matrix polymer as the binder resin include polymethacrylic ester or its partial hydrolyzate, polyvinyl acetate or its hydrolyzate, polyvinyl alcohol or its partial acetalized product, triacetyl cellulose, polyisoprene, polybutadiene,
Polychloroprene, silicone rubber, polystyrene, polyvinyl butyral, polychloroprene, polyvinyl chloride, chlorinated polyethylene, chlorinated polypropylene, poly-N-vinylcarbazole or a derivative thereof, poly-N
-Vinylpyrrolidone or a derivative thereof, a copolymer of styrene and maleic anhydride or a half ester thereof, acrylic acid, acrylic ester, methacrylic acid, methacrylic ester, acrylamide, acrylonitrile, ethylene, propylene, vinyl chloride, vinyl acetate, etc. A copolymer or the like having at least one of the copolymerizable monomer groups as a polymerization component, or a mixture thereof is used. Preferably polyisoprene, polybutadiene, polychloroprene, polyvinyl alcohol, or polyvinyl acetal which is a partially acetalized product of polyvinyl alcohol, polyvinyl butyral, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, or the like, or a mixture thereof. .

As a step of stabilizing the recorded hologram, there is a step of monomer transfer by heating. For this purpose, these matrix polymers preferably have a relatively low glass transition temperature and facilitate monomer transfer. It is necessary to be.

Examples of the photopolymerizable compound include photopolymerizable and photocrosslinkable monomers and oligomers having at least one ethylenically unsaturated bond in one molecule as described below.
Prepolymers, and mixtures thereof, for example, unsaturated carboxylic acids and salts thereof, esters of unsaturated carboxylic acids and aliphatic polyhydric alcohol compounds, unsaturated carboxylic acids and aliphatic polyhydric amine compounds and Amide bond.

Specific examples of unsaturated carboxylic acid monomers include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, and their halogen-substituted unsaturated carboxylic acids such as chlorinated unsaturated carboxylic acids. , Brominated unsaturated carboxylic acids, fluorinated unsaturated carboxylic acids, and the like. Examples of the salts of unsaturated carboxylic acids include the above-mentioned sodium salts and potassium salts.

Specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid include acrylates such as ethylene glycol diacrylate, triethylene glycol diacrylate, and 1,3-butanediol diacrylate. Acrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolpropane tri (acryloyloxypropyl) ether, trimethylolethane triacrylate, 1,4-cyclohexanediol di Acrylate,
Tetraethylene glycol diacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol diacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, sorbitol triacrylate, sorbitol Tetraacrylate, sorbitol pentaacrylate, sorbitol hexaacrylate, tri (acryloyloxyethyl) isocyanurate, polyester acrylate oligomer, 2-phenoxyethyl acrylate, 2-phenoxyethyl methacrylate, phenol ethoxylate monoacrylate, 2- (p-
(Chlorophenoxy) ethyl acrylate, p-chlorophenyl acrylate, phenyl acrylate, 2-phenylethyl acrylate, (2-acryloxyethyl) ether of bisphenol A, ethoxylated bisphenol A diacrylate, 2- (1-naphthyloxy) ethyl Acrylate and o-biphenyl acrylate.

Of the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, methacrylic acid esters include tetramethylene glycol dimethacrylate, triethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, and trimethyl glycol dimethacrylate. Methylol propane trimethacrylate, trimethylol ethane trimethacrylate, ethylene glycol dimethacrylate, 1,3-butanediol dimethacrylate, hexanediol dimethacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol hexa Methacrylate,
Sorbitol trimethacrylate, sorbitol tetramethacrylate, bis- [p- (3-methacryloxy-2-hydroxypropoxy) phenyl] dimethylmethane, bis- [p- (acryloxyethoxyphenyl)
Examples include dimethylmethane, 2,2-bis (4-methacryloyloxyphenyl) propane, and 2-naphthyl methacrylate.

Among the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, itaconic esters include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-
Butanediol diitaconate, 1,4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaethasritol diitaconate, sorbitol tetritaconate, and the like.

Among the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, the crotonates include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate, Sorbitol tetracrotonate and the like.

Of the specific examples of the ester monomer of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, isocrotonic acid esters include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, and sorbitol tetraisocrotonate. Etc.

Among the specific examples of the monomer of the ester of the aliphatic polyhydric alcohol compound and the unsaturated carboxylic acid, maleic esters include ethylene glycol dimaleate, triethylene glycol dimaleate, pentaerythritol dimaleate, Sorbitol tetramaleate and the like.

The halogenated unsaturated carboxylic acids include
2,2,3,3-tetrafluoropropyl acrylate, 1H, 1H, 2H, 2H-heptadecafluorodecyl acrylate, 2,2,3,3-tetrafluoropropyl methacrylate, 1H, 1H, 2H, 2H-heptadeca Fluorodecyl methacrylate, methacrylic acid
2,4,6-tribromophenyl, dibromoneopentyl dimethacrylate, (trade name; NK ester DBN,
Shin-Nakamura Chemical Co., Ltd.), dibromopropyl acrylate (trade name: NK Ester A-DBP, Shin-Nakamura Chemical Co., Ltd.), dibromopropyl methacrylate (trade name: NK Ester DBP, Shin-Nakamura Chemical Co., Ltd.) )),
Methacrylic acid chloride, methacrylic acid-2,4,6-
Trichlorophenyl, p-chlorostyrene, methyl-2
-Chloroacrylate, ethyl-2-chloroacrylate, n-butyl-2-chloroacrylate, tribromophenol acrylate, tetrabromophenol acrylate and the like.

Specific examples of amide monomers of an unsaturated carboxylic acid and an aliphatic polyamine compound include methylenebisacrylamide, methylenebismethacrylamide, 1,6-hexamethylenebisacrylamide,
6-Hexamethylenebismethacrylamide, diethylenetriaminetrisacrylamide, xylylenebisacrylamide, xylylenebismethacrylamide, N-phenylmethacrylamide, diacetoneacrylamide and the like.

As another example, see JP-B-48-417.
08, a polyisocyanate compound having two or more isocyanate groups in one molecule, a compound represented by the general formula CH
₂ ＣC (R) COOCH ₂ (R ′) OH (wherein R and R ′
Represents hydrogen or a methyl group. A) a vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule to which a vinyl monomer having a hydroxyl group is added.

Urethane acrylates described in JP-A-51-37193, JP-A-48-6418
No. 3, JP-B-49-43191, JP-B-52
Polyester acrylates and polyfunctional acrylate methacrylates such as an epoxy group and (meth) acrylic acid as described in JP-A-30490 can be exemplified.

Further, the Journal of the Adhesion Society of Japan, Vol. 20, N
o. 7, those introduced as photocurable monomers and oligomers on pages 300 to 308 can also be used.

Other monomers containing phosphorus include mono (acryloyloxyethyl) acid phosphate (trade name: Light Ester PA, manufactured by Kyoeisha Yushi Kagaku Kogyo KK) and mono (2-methacryloyloxyethyl) acid Phosphate (trade name; light ester PM,
Kyoeisha Yushi Kagaku Kogyo Co., Ltd.), and an epoxy acrylate-based product name; Lipoxy VR-60
(Trade name (Lipoxy VR-90, manufactured by Showa Polymer Co., Ltd.)
(Manufactured by Showa Polymer Co., Ltd.).

Also, trade name: NK ester M-230G
(Manufactured by Shin-Nakamura Chemical Co., Ltd.), trade name: NK ester 2
3G (manufactured by Shin-Nakamura Chemical Co., Ltd.) is also included.

Further, triacrylates having the following structure

[0043]

Embedded image

(Trade name: Aronix M-315, manufactured by Toa Gosei Chemical Industry Co., Ltd.), triacrylates having the following structure

[0045]

Embedded image

(Trade name: Aronix M-325, manufactured by Toa Gosei Chemical Industry Co., Ltd.), and 2,2'-bis (4-
Acryloxy diethoxyphenylpropane (trade name;
NK ester A-BPE-4), tetramethylolmethanetetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name: NK ester A-TMMT) and the like.

Next, as a photopolymerization initiator in the initiator system, 1,3-di (t-butyldioxycarbonyl) benzophenone, 3,3 ′, 4,4′-tetrakis (t-
(Butyldioxycarbonyl) benzophenone, N-phenylglycine, 2,4,6-tris (trichloromethyl) s-triazine, 3-phenyl-5-isoxazolone, 2-mercaptobenzimidazole, imidazole dimer, etc. Is exemplified. The photopolymerization initiator is preferably decomposed after recording the hologram from the viewpoint of stabilizing the recorded hologram. For example, organic peroxides are preferred because they are easily decomposed by ultraviolet irradiation.

The sensitizing dyes include thiopyrylium salt dyes, merocyanine dyes, quinoline dyes, styrylquinoline dyes, ketocoumarin dyes, thioxanthene dyes, xanthene dyes, and oxonol dyes having absorption light at 350 to 600 nm. Dyes, cyanine dyes, rhodamine dyes, thiopyrylium salt dyes, pyrylium ion dyes, and diphenyliodonium ion dyes are exemplified. A sensitizing dye having absorption light in a wavelength region of 350 nm or less or 600 nm or more may be present.

It comprises the above-mentioned matrix polymer, photopolymerizable compound, photopolymerization initiator and sensitizing dye,
The compounding ratio of the volume hologram forming material is as follows. The photopolymerizable compound is 10 parts by weight to 1000 parts by weight, preferably 10 parts by weight, based on 100 parts by weight of the binder resin.
It is used in a proportion of 100 parts by weight to 100 parts by weight. The photopolymerization initiator is 1 part by weight to 1 part by weight based on 100 parts by weight of the binder resin.
0 parts by weight, preferably 5 parts by weight to 10 parts by weight. The sensitizing dye is used in an amount of 0.01 to 1 part by weight, preferably 0.01 to 0.5 part by weight, based on 100 parts by weight of the binder resin.

Other components of the material for forming a volume hologram include, for example, plasticizer, glycerin, diethylene glycol, triethylene glycol and various nonionic surfactants, cationic surfactants, anionic surfactants Is mentioned.

The material for forming the volume hologram is acetone,
Methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, benzene, toluene, xylene, chlorobenzene, tetrahydrofuran, methyl cellosolve, ethyl cellosolve, methyl cellosolve acetate, ethyl cellosolve acetate, ethyl acetate, 1,4-dioxane, 1,2-dichloroethane, dichloromethane, Using chloroform, methanol, ethanol, isopropanol, etc., or a mixed solvent thereof, and having a solid content of 15% to
The coating liquid is about 25%. If the support film is applied in the form of a single sheet (each sheet) using these coating solutions, the support film is rolled into a long length by bar coating, spin coating, dipping or the like. If it is applied in the state of, apply by gravure coat, roll coat, die coat, comma coat, etc., and after applying all, solidify using the drying or curing means according to the application liquid Let it. The thickness of the material for forming a volume hologram thus obtained is 0.1 μm to 50 μm, preferably 5 μm to 20 μm.
m.

A protective film may be stuck on the volume hologram-forming material obtained by coating the support film until the hologram information is exposed. The protective film has a thickness of 1 μm to 1 mm, preferably 1 μm to 1 mm.
A highly transparent, highly smooth resin film such as a polyethylene terephthalate film of 0 μm to 100 μm, a polyethylene film, a polypropylene film, a polyvinyl chloride film, an acrylic film, a triacetyl cellulose film, a cellulose acetate butyrate film, and the like, using a rubber roller or the like. It is good to stick. Alternatively, instead of attaching a transparent resin film, a protective film may be formed by applying a coating material in which a film-forming material such as triacetyl cellulose, polyvinyl alcohol, or polymethyl methacrylate is dissolved by spin coating or the like.

The material for forming a volume hologram on the support film, when a protective film is adhered, as it is or after peeling off the protective film, directly from the support film side, a two-beam laser beam, for example, Using an argon laser (wavelength: 514.5 nm), a krypton laser (wavelength: 647 nm), or the like, record the interference light between the object light and the reference light, or peel off the protective film, and then use the material for forming a volume hologram. The original volume hologram was directly adhered to the support and the argon laser (wavelength 514.5 n) was applied from the support film side of the material for forming the volume hologram.
m) is incident, and interference fringes between the reflected light from the original and the incident light are recorded to give information on the volume hologram.

[0054] Then, ultra-high pressure mercury lamp, high pressure mercury lamp, carbon arc, xenon arc, from a light source such as a metal halide lamp, 0.1~10,000mJ / cm ^2, preferably, ultraviolet radiation 10~1,000mJ / cm ² And a heat treatment, for example, a step of diffusing and moving a photopolymerizable compound by heating at 120 ° C. for 24 minutes to obtain a stable volume hologram.

The hologram layer 2 of the present invention typically has a structure in which a hologram layer made of a polymer having a volume hologram obtained as described above is laminated on a support film. When a transparent material is used, various layers are laminated as it is or by peeling off the support film.

The pressure-sensitive adhesive used in the present invention includes:
For the transparent pressure-sensitive adhesive layers 3, 4a and 4b, the same can be used in principle. However, when the transparent adhesive layer 4a is laminated between the light transmission suppressing layer 1 and the hologram layer 2, the transparent adhesive layer 4a may not always be transparent. Either one or both of the light transmission suppressing layer 1 and the transparent pressure-sensitive adhesive layer 4a are colored and have a light-shielding property, or one of the light transmission suppressing layer 1 and the transparent pressure-sensitive adhesive layer 4a This is because one of the layers is colored and the other is light-shielding, so that both layers can function as a light transmission suppressing layer as a whole. The permeation suppression layer also includes such a material. Further, since the transparent pressure-sensitive adhesive layers 4 a and 4 b are directly laminated on the hologram layer 2, it is preferable that the transparent pressure-sensitive adhesive layers 4 a and 4 b do not contain a migrating substance that migrates to the hologram layer 2. When using a plurality of transparent pressure-sensitive adhesive layers,
If the adhesive strength of each layer is adjusted and, for example, the transparent adhesive layer 4a is configured so that the adhesive strength of the transparent pressure-sensitive adhesive layer 4a in FIG. 4 exceeds the adhesive strength to the adherend, the uppermost light transmission suppressing layer 1 is pinched and peeled off. At times, the pressure-sensitive adhesive layer 3 can be prevented from remaining on the adherend 7.

As the adhesive, for example, acrylic resin,
Acrylic ester resins or their copolymers, styrene-butadiene copolymers, natural rubber, casein, gelatin, rosin esters, terpene resins, phenolic resins, styrene resins, cumarone indene resins, polyvinyl ether, silicone resins And the like, and α
-Adhesives of cyanoacrylate type, silicone type, maleimide type, styrene type, polyolefin type, resorcinol type, polyvinyl ether type, silicone type and the like.

In addition to the above, a heat sealant also exhibits tackiness when heated, and can be used as a pressure-sensitive adhesive. For example, ethylene-vinyl acetate copolymer resin, polyamide resin, polyester resin, polyethylene resin, ethylene-isobutyl acrylate copolymer resin, butyral resin, polyvinyl acetate and its copolymer resin, cellulose derivative, polymethyl methacrylate resin, A polyvinyl ether resin, a polyurethane resin, a polycarbonate resin, a polypropylene resin, an epoxy resin, or a phenol resin can be used. Alternatively, SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer),
A thermoplastic elastomer such as SEBS (styrene-ethylene-butylene-styrene block copolymer) or a reaction hot-melt resin may be used. The transparent pressure-sensitive adhesive layers 3, 4a, and 4b may be formed using the above-mentioned materials so as to have a thickness of 4 μm to 20 μm.

There are several methods for applying a pressure-sensitive adhesive and bonding, one of which is applied to one or both sides of the bonding surface, dried if necessary, and then There is a method of crimping. At the time of press bonding, heating may be performed if necessary. Alternatively, a pressure-sensitive adhesive is applied to the releasable surface of the releasable sheet, called a separator, and then pressure-bonded to one of the adhesive surfaces, and the separator is peeled off after the pressure-bonding,
There is a method of pressing another adhesive surface to the pressure-sensitive adhesive surface exposed by peeling. When the adhesive is applied immediately after being applied to the separator, the number of the separators may be one, but the adhesive layer, or the adhesive layer, the transparent reinforcing layer, and the adhesive layer are provided between the two separators. There is a method such as using a `` double-sided tape '' to make what sandwiches those laminated in order, first, peeling off one separator and bonding it, then peeling off the other separator and bonding it, Good. A double-sided tape having a transparent reinforcing layer inside is suitable for producing a transparent reinforcing layer 5 laminated on the hologram layer 2 via an adhesive layer as shown in FIG. Here, as the transparent reinforcing layer, a non-woven fabric or the like can be used as long as the transparency can be ensured. However, in that respect, a transparent plastic film is more preferable. Can be used as the plastic film used when forming the film by laminating colored films.

The release sheet 6 is made of synthetic resin laminated paper, synthetic paper, or a synthetic resin film subjected to a release treatment. For example, the surface of the PET film is made of a fluorine-based release agent, a silicone-based release agent, or a stearic acid-based release agent. It is preferable to use a material that has been release-treated with a mold agent, a wax-based release agent, or the like.

The transparent substrate of the hologram laminate of the present invention, in other words, the object to which the hologram label for backing of the present invention is applied is a transparent material such as glass or plastic. In addition to acrylic resin, polystyrene resin, polycarbonate resin, etc., the same materials as those listed as examples of the transparent plastic film cited as the base material of the protective film and the volume hologram forming material are applicable. Examples of typical articles include, for example, various vehicles such as automobiles and railway vehicles, windows of aircrafts, windows for observation, and doors. Alternatively, there are building windows, doors, mortis windows, light windows, and the like. In addition, products that can be counterfeited, such as cameras, video tape recorders, or equipment such as high-end audio equipment, or high-grade watches, jewelry, precious metals, antiques, etc., made of transparent materials. Are included.

The hologram label for backing is suitable for use as a certificate showing the safety and hygiene grades of fire protection, disinfection, fire protection and the like, or as a certificate that the measures for that purpose have been taken. Also, for relatively expensive products and cases,
It is also suitable for use as a proof that goods are genuine. In addition, for applications where a paper certificate has been pasted and sealed, and the target article is transparent and has a substantially flat or quadratic surface, the certificate is basically replaced with a certificate. Can be used. Therefore, in the present invention, the hologram image of the hologram layer 2 can be designed according to the above-mentioned object, application, and purpose, and can freely include symbols and characters expressing necessary meanings.

The production of the backing hologram label of the present invention has been described in a fragmentary manner. However, in order to make sure, the hologram original is designed as a hologram image designed in accordance with the above-mentioned intention. There is a method of calculating a hologram diffraction grating that reproduces the hologram by calculation and drawing the hologram diffraction grating by an appropriate means such as an electron beam. Next, a hologram-forming photoconductor is prepared by laminating a hologram-forming material on an appropriate support, and the hologram-forming material is exposed to information of a hologram master using a laser beam or the like and developed to copy the hologram. In the case of mass production, this initial duplication may be performed several times, and the duplicated hologram may be used as a mass duplication master.

Since the obtained hologram typically has a polymer layer (= hologram layer) incorporating the hologram on the support, the hologram layer is directly shielded from light, for example, black light. A light transmission suppressing layer is laminated by applying a transparent film via an adhesive or applying a coating such as black. An adhesive is simply applied to the lower surface of the opposite support, or a release sheet coated with a transparent adhesive is overlapped and laminated so that the transparent adhesive is in contact with the support. Alternatively, the support of the hologram is peeled off, and a double-sided tape is prepared by laminating a pressure-sensitive adhesive and a release sheet on both sides at the mark where the hologram has been peeled off, and only one release sheet is peeled off and adhered to the support. An adhesive layer with a release sheet may be laminated on the lower surface of the body.

[0065]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a material for forming a hologram, a polyethylene terephthalate (= PET) having a thickness of 50 μm was used.
A hologram-forming film (Omnidex 7) in which an ultraviolet-curable resin composition is applied to a thickness of 20 μm on the film, and a 50 μm-thick polyvinyl chloride film is further adhered to the film.
06) was used. The hologram-forming film was exposed using an original volume hologram, using an argon laser having a wavelength of 488 nm, and after exposure, heated and developed.

The polyvinyl chloride film was peeled from the obtained laminate, and a black PET (= polyethylene terephthalate) film, an acrylic pressure-sensitive adhesive, and a release sheet were sequentially laminated on the peeled trace (Lintech Co., Ltd.). ), A black PET film, an acrylic adhesive, a volume hologram layer, and a PET film were laminated in this order to obtain an intermediate. Black PE used here
The T film was obtained by kneading carbon black at the time of film formation, and had an optical density (transmission) of 1.9. Furthermore, from this intermediate, the PET film laminated on the volume hologram layer was peeled off,
Release sheet, acrylic adhesive, transparent PET film,
Acrylic pressure-sensitive adhesive, and double-sided pressure-sensitive adhesive film in which a release sheet is sequentially laminated (manufactured by Lintec Co., Ltd., PET (W)
PL thin) was peeled off and pasted on one release sheet.

As described above, the final product
A backing hologram label in which a black PET film, an acrylic pressure-sensitive adhesive, a volume hologram layer, an acrylic pressure-sensitive adhesive, a transparent PET film, an acrylic pressure-sensitive adhesive, and a release sheet were sequentially laminated was obtained. In the state in which the release sheet is peeled off, the obtained hologram label for the backing, although the hologram image looks somewhat blurred due to the unevenness of the adhesive surface, the hologram can be visually recognized, and the hologram label is attached to the transparent glass plate. And a clear hologram image could be visually recognized.

[0068]

According to the first aspect of the present invention, when pasted to the transparent object to be pasted from the back side, the space from the hologram layer to the observation company is transparent, and light is transmitted to the opposite side of the hologram layer. Due to the presence of the suppression layer, there is no influence of light from the opposite side when observing from the front side, and the visibility of the hologram image is high.

According to the second aspect of the present invention, since the separately formed light transmission suppressing layer is laminated via the pressure-sensitive adhesive layer, this structure has a hologram layer for forming the light transmission suppressing layer. Impact can be minimized.

According to the third aspect of the present invention, when the transparent pressure-sensitive adhesive layer for adhesion to the adherend is laminated, the transparent pressure-sensitive adhesive layer is applied after being laminated on another layer in advance. In this case, the effect on the hologram layer can be minimized.

According to the fourth aspect of the present invention, since the pressure-sensitive adhesive layer is reinforced by the transparent reinforcing layer, a hologram label for backing with high adhesive strength can be provided at the time of sticking to an adherend. .

According to the fifth aspect of the present invention, since the release sheet is laminated on the exposed surface of the transparent pressure-sensitive adhesive layer, it can be prevented from being inadvertently attached during handling, and the transparent pressure-sensitive adhesive layer can be prevented. Can be prevented from being stained to lower the adhesive strength and the interposition of foreign matter when attaching to an adherend.

According to the sixth aspect of the present invention, the hologram of the hologram layer can be visually recognized from the front side by being attached to the back side of the transparent base material, and is attached to the inner surface. Unauthorized peeling from the outside can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the structure of a basic backing hologram label.

FIG. 2 is a cross-sectional view of another embodiment of the backing hologram label.

FIG. 3 is a cross-sectional view of another embodiment of the backing hologram label.

FIG. 4 is a cross-sectional view of another embodiment of the backing hologram label.

FIG. 5 is a cross-sectional view of another embodiment of the backing hologram label.

FIG. 6 is a cross-sectional view of another embodiment of the backing hologram label.

FIG. 7 is a sectional view of a hologram laminate.

[Explanation of symbols]

 Reference Signs List 1 light transmission suppressing layer 2 hologram layer 3 transparent pressure-sensitive adhesive layer 4 transparent pressure-sensitive adhesive layer 5 transparent reinforcing layer 6 release sheet 7 transparent substrate

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H049 CA05 CA15 CA22 CA28 2K008 AA00 AA13 BB04 BB08 DD13 DD14 DD15 DD22 FF17 HH01 HH19

Claims (6)

[Claims] 1. A hologram layer having a built-in hologram diffraction grating, a transparent pressure-sensitive adhesive layer for bonding to an adherend is laminated on one surface of the hologram layer, and the other surface of the hologram layer is A hologram label for back application in which a light transmission suppressing layer for suppressing transmission of visible light is laminated in order to improve the visual contrast of a hologram image when viewed from the transparent pressure-sensitive adhesive layer side. 2. The backing hologram label according to claim 1, wherein the hologram layer and the light transmission control layer are laminated via a transparent pressure-sensitive adhesive layer. 3. The hologram label according to claim 1, wherein the hologram layer and a transparent pressure-sensitive adhesive layer for adhesion to an adherend are laminated via a transparent reinforcing layer. 4. The backing hologram label according to claim 3, wherein the hologram layer and the transparent reinforcing layer are laminated via a transparent pressure-sensitive adhesive layer. 5. The backing hologram label according to claim 1, wherein a release sheet is laminated on an exposed surface of the transparent pressure-sensitive adhesive layer for adhesion to an adherend. 6. A hologram laminate in which the backing hologram label according to any one of claims 1 to 4 is laminated on a back surface of a transparent substrate via a transparent pressure-sensitive adhesive layer for adhesion to an adherend.