JPH10133552A - Volume hologram laminate and label for manufacture of volume hologram laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hologram laminate which ensures forgery prevention by surely destroying a volume hologram display stuck onto certificates and cards like photographs when this display is peeled, in preventing the forgery by discriminating whether the volume hologram display is destroyed or not and a label for manufacture of this hologram laminate. SOLUTION: The volume hologram laminate 1 is a volume hologram laminate formed by successively laminating a first tacky adhesive layer 5', a volume hologram layer 6, a second tacky adhesive layer 5 and a surface protective film 7 on a base material 2. The tacky adhesiveness at this second tacky adhesive layer 5 is made weaker than the tacky adhesiveness at the first tacky adhesive layer 5' and the surface protective film 7 is so formed that a peeling line is generated in the direction perpendicular to the peeling direction when this film is peeled from the volume hologram laminate. A colored sheet may be laminated via a third tacky adhesive layer on the base material of the volume hologram laminate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a volume hologram laminate or a volume hologram laminate containing a transparent hologram image which is stuck on the surface of an identification card, an admission ticket, a passport, a credit card or a bank card for the purpose of ensuring security. More particularly, the present invention relates to a volume hologram laminate or a label for forming a volume hologram laminate which can prevent intentional replacement for the purpose of falsification or the like.

[0002]

2. Description of the Related Art In recent years, for example, in order to match a person who brings an ID card with a person described on the ID card,
Although a hologram is stuck on a photograph, a technique for preventing intentional sticking of a photograph for the purpose of falsification and the like is disclosed in Japanese Utility Model Publication No. 5-48215, Japanese Patent Laid-Open No. 5-20 / 1993.
No. 1181 and the like.

The technology described in these publications utilizes the fact that the hologram containing an image has a function equivalent to that of a stamp or the like in a conventional identification card or the like. In the case of delamination for the purpose of alteration or the like, the hologram layer is destroyed by using the softness of the hologram layer, and the hologram image cannot be reproduced even when the hologram layer is re-adhered. They try to prevent counterfeiting.

However, when a rigid plastic film is used as the surface protective layer, the hologram layer is peeled off cleanly following the surface protective layer, and the trace of replacement of the photograph may become unclear. For the purpose, it is required to further ensure the forgery prevention function.

[0005]

An object of the present invention is to determine whether or not an identification card with a photograph or the like attached thereto or a volume hologram display attached to a card has been destroyed to prevent forgery thereof. An object of the present invention is to provide a hologram laminate and a label for producing the hologram laminate, which can surely break the volume hologram display when peeling is attempted, and which reliably prevent forgery.

[0006]

According to the first volume hologram laminate of the present invention, a first pressure-sensitive adhesive layer, a volume hologram layer, a second pressure-sensitive adhesive layer, and a surface protection film are sequentially laminated on a substrate. A volume hologram laminate, wherein the adhesiveness of the second adhesive layer is made weaker than the adhesiveness of the first adhesive layer,
Further, when the surface protective film is peeled off from the volume hologram laminate, a peeling line is generated in a direction perpendicular to the peeling direction.

[0007] The second volume hologram laminate of the present invention comprises:
On a substrate, a third adhesive layer, a colored sheet, a first adhesive layer,
A volume hologram laminate in which a volume hologram layer, a second pressure-sensitive adhesive layer, and a surface protection film are sequentially laminated, wherein the adhesiveness of the second pressure-sensitive adhesive layer is controlled by the first pressure-sensitive adhesive layer and the third pressure-sensitive adhesive layer. And peeling off the surface protective film from the volume hologram laminate in a direction perpendicular to the peeling direction when peeling the surface protective film from the volume hologram laminate.

In the above volume hologram laminate, the peel strength of the surface protective film from the volume hologram laminate is 0.001 kg / 25 mm to 0.1 kg / kg.
25 mm, and the peel strength between the substrate and the volume hologram layer is from 0.1 kg / 25 mm to 5.0 kg / 25 m.
m.

In the above volume hologram laminate, the volume hologram layer is composed of a matrix polymer, a photopolymerizable compound, a photopolymerization initiator and a sensitizing dye, and is a photosensitive material for dry volume phase hologram recording. It is characterized by consisting of.

The first label for producing a volume hologram laminate of the present invention is a volume hologram laminate in which a first pressure-sensitive adhesive layer, a volume hologram layer, a second pressure-sensitive adhesive layer, and a surface protection film are sequentially laminated on release paper. When the adhesiveness of the second pressure-sensitive adhesive layer is made weaker than the adhesiveness of the first pressure-sensitive adhesive layer, and when the surface protective film is peeled off from the volume hologram laminate, the peeling direction is It is characterized in that a peeling line is generated in a perpendicular direction.

The second label for producing a volume hologram laminate of the present invention comprises a third adhesive layer, a colored sheet, a first adhesive layer, a volume hologram layer, a second adhesive layer, and a surface protective film on a release paper. A volume hologram laminate that is sequentially laminated, wherein the adhesiveness of the second adhesive layer is made weaker than the adhesiveness of the first adhesive layer and the third adhesive layer, and the surface protective film is A label for producing a volume hologram laminate, characterized in that when peeled off from the volume hologram laminate, a peeling line is generated in a direction perpendicular to the direction of the peeling.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a front view of a first or second volume hologram laminate of the present invention, and FIG.
FIG. 3 is a cross-sectional view of the first volume hologram laminate taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view of the second volume hologram laminate taken along the line AA in FIG.

In the figure, 1 is a volume hologram laminate, 2 is a substrate such as a certificate, 3 is a photo sticker, 4 is a face photograph, 5 is a second adhesive layer, 5 'is a first adhesive layer, 5 ″ is a third adhesive layer, 6 is a volume hologram layer, 7 is a surface protection film, 8
Denotes personal information, and 9 denotes a coloring sheet.

The volume hologram laminate 1 of the present invention
In the example shown in FIG. 1, taking an examination ticket as an example, personal information 8 such as a name and an examination number is entered, and a face photograph 4 is attached. The face photograph 4 is pasted in order to verify whether the person who brings the examination ticket is a person of the personal information described in the examination ticket. A volume hologram layer 6 and a surface protection film 7 are laminated on the face photograph 4 and the test ticket base material. On this volume hologram layer, a hologram image such as a school name or a school emblem is recorded as interference fringes corresponding to the hologram interference pattern.

Next, the layer configuration of the first volume hologram laminate will be described with reference to FIG. The first volume hologram laminate of the present invention comprises a photo-paste paste 3 on a substrate 2.
The first adhesive layer 5 ′, the volume hologram layer 6, the second adhesive layer 5, and the surface protection are provided so as to extend over the base material 2 and the face photograph 4. Films 7 are sequentially stacked.

As the substrate 2, a film or sheet made of paper, synthetic paper, synthetic resin or metal can be used, and a sheet shape such as an examination card as shown in FIG. 1, a card shape such as an ID card, Various forms such as a booklet such as a passport, a bank card, and a credit card can be used.

The photo-paste glue 3 has an adhesive strength that cannot peel the photograph 4 from the substrate 3 even when the laminate composed of the volume hologram laminate and the surface protection film is to be peeled from the substrate. Commonly, common starch pastes and synthetic pastes can be used.

The face photograph 4 may be a known photographic material represented by a silver salt, a sublimation transfer image, or the like. The face photograph 4 does not necessarily need to be an image of a face. It may be an image displaying a part that can be specified.

In the volume hologram layer 6, after a volume hologram recording material is applied onto a support film, interference fringes corresponding to the wavefront of light from an object are recorded in the layer in the form of transmittance modulation and refractive index modulation. Also, at the time of duplication, it can be easily produced by bringing the volume hologram master into close contact and performing exposure and development. Examples of the recording material include well-known volume hologram recording materials such as a silver salt material, a dichromated gelatin emulsion, a photopolymerizable resin, and a photocrosslinkable resin. From the viewpoint of properties, a photosensitive material for use in dry volume phase hologram recording comprising a matrix polymer, a photopolymerizable compound, a photopolymerization initiator and a sensitizing dye is preferred.

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, and unsaturated carboxylic acids and aliphatic polyhydric amine compounds. Amide bonds may be mentioned.

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. The salts of unsaturated carboxylic acids include the sodium and potassium salts of the aforementioned acids.

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, hexanediol diacrylate, 1,4 -Cyclohexanediol diacrylate, 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, o -Biphenyl methacrylate, o-biphenyl acrylate and the like.

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, tetramethylene glycol diacrylate, propylene glycol diacrylate, neopentyl glycol diacrylate, trimethylolpropane triacrylate, trimethylolpropane tri (acryloyloxypropyl) ether, trimethylolethane triacrylate, hexanediol diacrylate 1,4-cyclohexanediol diacrylate, tetraethylene glycol diacrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol diacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol Pentaerythritol Sa, sorbitol triacrylate, sorbitol tetraacrylate,
Sorbitol pentaacrylate, sorbitol hexaacrylate, tri (acryloyloxyethyl) isocyanurate, polyester acrylate oligomer and the like.

Examples of the methacrylic acid ester include tetramethylene glycol dimethacrylate, triethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, trimethylolethane trimethacrylate, ethylene glycol dimethacrylate, and 1,3-butanediol. Dimethacrylate, hexanediol dimethacrylate, pentaerythritol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, dipentaerythritol dimethacrylate, dipentaerythritol hexamethacrylate, sorbitol trimethacrylate, sorbitol tetramethacrylate, bis- [p- (3 -Methacryloxy-2- Mud propoxy) phenyl] dimethyl methane, bis - [p- (acryloxy ethoxy phenyl] dimethyl methane, 2,2-bis (4-methacryloyloxy) propane, methacrylate -2
-Naphthyl and the like.

Examples of itaconic acid esters include ethylene glycol diitaconate, propylene glycol diitaconate, 1,3-butanediol diitaconate,
4-butanediol diitaconate, tetramethylene glycol diitaconate, pentaerythritol diitaconate, sorbitol tetritaconate, and the like.

The crotonates include ethylene glycol dicrotonate, tetramethylene glycol dicrotonate, pentaerythritol dicrotonate,
And sorbitol tetracrotonate.

Examples of the isocrotonic acid ester include ethylene glycol diisocrotonate, pentaerythritol diisocrotonate, sorbitol tetraisocrotonate and the like.

Examples of the maleic acid ester 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, manufactured by Shin-Nakamura Chemical Co., Ltd.), dibromopropyl acrylate (trade name: NK ester A-DBP, Shin-Nakamura Chemical Co., Ltd.) Dipromopropyl methacrylate (trade name: NK ester DBP, manufactured by 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 the amide monomer 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.
JP-A-08-0838, a polyisocyanate compound having two or more isocyanate groups in one molecule, represented by the following general formula: CH ₂ CC (R) COOCH ₂ CH (R ′) OH (where R and R ′ are hydrogen or And a vinyl urethane compound containing two or more polymerizable vinyl groups in one molecule to which a hydroxyl-containing vinyl monomer represented by the following formula:

Further, urethane acrylates described in JP-A-51-37193, JP-A-48-641
No. 83, Japanese Patent Publication No. 49-43191, Japanese Patent Publication No. 5
Polyester acrylates, epoxy resins and (meth) as described in JP-A-2-30490, respectively.
Examples include polyfunctional acrylates and methacrylates such as acrylic acid.

Further, the Journal of the Adhesion Society of Japan, Vol. 20, N
o7, those introduced as photocurable monomers and oligomers on pages 300 to 308 can also be used.

Other monomers containing phosphorus include mono (2-acryloyloxyethyl) acid phosphate (trade name: Light Ester PA, manufactured by Kyoeisha Yushi Kagaku Kogyo KK) and mono (2-methacryloikiethyl) Acid Phosphate (trade name: Light Ester PM, manufactured by Kyoeisha Yushi Kagaku Kogyo Co., Ltd.); epoxy acrylate-based trade name: Lipoxy VR-60 (manufactured by Showa Polymer Co., Ltd.); trade name: Lipoxy VR-90 (manufactured by Showa Polymer Co., Ltd.) and the like.

Product 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 structural formula:

[0037]

Embedded image

(Alonix M-315, manufactured by Toa Gosei Chemical Industry Co., Ltd.)

[0039]

Embedded image

(Trade name, manufactured by Toa Gosei Chemical Industry Co., Ltd.)
Aronix M-325) and 2,2'-bis (4-acryloxydiethoxyphenyl) propane (manufactured by Shin-Nakamura Chemical Co., Ltd., 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, and imidazole dimers Etc. are exemplified. The photopolymerization initiator is
From the viewpoint of stabilization of the recorded hologram, it is preferable that the hologram is decomposed after recording the hologram. For example, organic peroxides are preferable 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. Note that a sensitizing dye having absorption light in a wavelength region of 350 nm or less or 600 nm or more may be used.

Examples of the matrix polymer as a binder resin include polymethacrylic acid ester or its partially hydrolyzed product, polyvinyl acetate or its hydrolyzed product, polyvinyl alcohol or its partially acetalized product, triacetyl cellulose, polyisoprene, and 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, styrene and anhydrous Maleic acid copolymer or its half ester, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, acrylamide, acrylonitrile, ethylene, propylene, Vinyl, copolymers and at least one polymerizable component copolymerizable monomers groups such as vinyl acetate or mixtures thereof, are used. Preferably polyisoprene, polybutadiene, polychloroprene, polyvinyl alcohol, polyvinyl acetal which is also a partially acetalized product of polyvinyl alcohol,
Examples include polyvinyl butyral, polyvinyl acetate, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, and 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 the monomer transfer. It is necessary to be.

The photopolymerizable compound is a binder resin 1
It is used in an amount of 10 parts by weight to 1000 parts by weight, preferably 10 parts by weight to 100 parts by weight based on 00 parts by weight.

The photopolymerization initiator is used in a proportion of 1 to 10 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the binder resin.

The sensitizing dye is used in an amount of 0.01 to 1 part by weight, preferably 0.0 to 1 part by weight, based on 100 parts by weight of the binder resin.
It is used in a proportion of 1 part by weight to 0.5 part by weight.

Other photosensitive material components include, for example, plasticizers, glycerin, diethylene glycol, triethylene glycol and various nonionic surfactants, cationic surfactants, and anionic surfactants.

These hologram recording materials include 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, chloroform, methanol, ethanol, isopropanol or the like, or a mixed solvent thereof, is used. % ~
It is a 25% coating liquid. In addition, as such a coating liquid, for example, Omnidex 352, 70 manufactured by Tupon Corporation
6 may be used.

The thickness of the hologram recording layer is 0.1
μm to 50 μm, preferably 5 μm to 20 μm.

A protective layer is provided on the hologram recording layer. As the protective film, a polyethylene terephthalate film having a thickness of 0.001 to 10 mm, preferably 0.01 to 0.1 mm, a polyethylene film, a polypropylene film, a polyvinyl chloride film, an acrylic film, a polyacetylose film, a cellulose acetate butyrate A transparent resin film having good weather resistance, such as a film, may be formed by bonding with a rubber roller, or a film-forming material such as triacetylose, polyvinyl alcohol, polymethyl methacrylate may be applied by spin coating.

To record a hologram on the volume hologram layer, a two-beam laser beam, for example, an argon beam or a laser beam (wavelength 514.5) is produced by a Lippmann hologram forming apparatus in the same manner as in the conventional method for producing a dry hologram.
Use nm) or the like, the step of recording the interference fringes in the hologram recording layer, ultra-high pressure mercury lamp, high pressure mercury lamp, carbon arc, xenon arc, 0.1~10000mJ / cm ² from a light source such as a metal halide lamp, preferably 10 ~
A step of decomposing the photopolymerization initiator by irradiating 1000 mJ / cm ² of ultraviolet light, a heat treatment (for example, 120 ° C., 120
Hologram), and sequentially undergoes a process of diffusing and moving the photopolymerizable compound, thereby obtaining a stable hologram.

In the first volume hologram laminate of the present invention, as the first pressure-sensitive adhesive layer 5 ′, for example, an acrylic resin, an acrylate resin, a copolymer thereof, a styrene-butadiene copolymer, a natural Rubber, casein, gelatin, rosin ester, terpene resin, phenolic resin, styrene resin, chromanindene resin,
Examples include polyvinyl ether, silicone resin, and the like, and alpha-cyanoacrylate, silicone,
Maleimide-based, styrene-based, polyolefin-based, resorcinol-based, polyvinyl ether-based, silicone-based adhesives and the like, and a heat sealant, 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, polyvinyl ether resin, polyurethane resin, polycarbonate resin, polypropylene resin, epoxy resin, Phenol resin, SB
A thermoplastic elastomer such as S, SIS, SEBS, and SEPS, or a reactive hot melt resin may be used.

The second pressure-sensitive adhesive layer 5 may be made of, for example, an acrylic resin, an acrylate resin, a copolymer thereof, a styrene-butadiene copolymer, a natural rubber,
Casein, gelatin, rosin ester, terpene resin,
Examples include phenolic resins, styrene resins, chromanindene resins, polyvinyl ethers, silicone resins, and the like.Also, alpha-cyanoacrylate, silicone, maleimide, styrene, polyolefin, resorcinol, polyvinyl ether, and silicone And the like. Any of the pressure-sensitive adhesive layers may be formed to have a thickness of 4 μm to 20 μm.

In the volume hologram laminate of the present invention, the second layer is formed so as to be peeled between the surface protection film 7 and the volume hologram layer 6 when the volume hologram laminate is separated.
It is characterized in that the adhesiveness of the adhesive layer 5 is made weaker than the adhesiveness of the first adhesive layer 5 '. In order to make the adhesiveness of the second adhesive layer 5 weaker than the adhesiveness of the first adhesive layer 5 ', the adhesive of the first adhesive layer forming material and the first adhesive layer forming material is used. It is advisable to select one having a different tackiness.

The tackiness was measured by the peel strength (Kg / 25) of the laminate.
mm) and defined by JIS Z0237.
° Peeling test: Model SV-201-, manufactured by Konno Seisakusho Co., Ltd.
E is evaluated by E-tensile compression tester II. The measurement conditions are as follows.

Measurement atmosphere: 20 ° C. × 65% RH Test piece: 25 mm width Bonding: 2 Kg rubber roller pressed back and forth with one reciprocation Bonding time: 60 minutes after bonding Peeling angle: 180 ° Peeling speed: 250 mm / min Second The tackiness of the pressure-sensitive adhesive layer 5 can be evaluated by the peel strength when the surface protective film 7 is peeled off from the laminate.
0.001 kg / 25 mm to 0.1 kg / 25 mm, preferably 0.01 kg / 25 mm to 0.1 kg / 25 m
m. The adhesiveness of the first adhesive layer 5 'is larger than the adhesiveness of the second adhesive layer 5, and can be evaluated by the peeling force between the substrate 2 or the photograph 4 and the volume hologram layer 6, and is 0.1 kg / 25 mm. It is good to be -5.0 kg / 25 mm, preferably 0.5 g / 25 mm-3.0 kg / 25 mm.

The adhesiveness of the first adhesive layer 5 'and the second adhesive
Assuming that the adhesiveness of the adhesive layer 5 is within the above range, FIG.
(A), as shown in a schematic cross-sectional view (the pressure-sensitive adhesive layer is not shown), the peeling of the surface protective film 7 causes the volume hologram layer 6 to be caught at regular intervals and follow the surface protective film 7. A floating portion p is generated, and as shown in the perspective view of FIG. 4B, the peeling lines q arranged at regular intervals in a direction perpendicular to the peeling direction X, so-called “chatter”, form the volume hologram layer 6.
Occurs. The present invention is based on the finding that this phenomenon can be used to prevent forgery.After peeling off the surface protection film, even if you try to copy the hologram recording, the peeling line is also copied at the same time, which is different from the real thing. In addition, even if the hologram having the peeling line is repositioned on another substrate, the authenticity can be determined based on the presence or absence of the peeling line.

The surface protective film 7 is made of polyethylene film, polypropylene film, polyethylene fluoride film, polyvinylidene fluoride film, polyvinyl chloride film, polyvinylidene chloride film, ethylene-vinyl alcohol film, polyvinyl alcohol film, polymethyl film. Methacrylate film, polyethersulfone film, polyetheretherketone film, polyamide film, tetrafluoroethylene-perfluoroalkylvinylether copolymer film, polyester film such as polyethylene terephthalate film, polyimide film and the like are exemplified, as the thickness of the protective layer Is 2 μm to 200 μm, preferably 10 μm to
50 μm.

Although not shown, the surface protective film 7 may be subjected to a hard coat treatment as required for the purpose of enhancing the protection of the surface protective film 7 surface. The hard coat treatment is, for example, dipping coating of a silicone system, a fluorine-containing silicone system, a melamine alkyd system, a urethane-acrylate system (ultraviolet curing type), and the like.
Spray coating, roll coating method, film thickness 1μm
It is good to apply to 50 μm.

Although not shown, the surface of the surface protective film 7 or the hard coat surface may be subjected to a release treatment. The release treatment may be performed by dipping, spraying, or roll coating a fluorine-based release agent, a silicone-based release agent, a stearate-based release agent, a wax-based release agent, or the like.

Next, the second volume hologram laminate of the present invention will be described with reference to FIG. In the drawing, 9 indicates a colored sheet, 5 ″ indicates a third pressure-sensitive adhesive layer, and the same reference numerals as those in FIG. 2 indicate the same contents.

As shown in FIG. 3, in the second volume hologram laminate of the present invention, a colored sheet is laminated on a base material with a third adhesive layer 5 ″ interposed therebetween, and the first sheet is placed on the colored sheet. The pressure-sensitive adhesive layer 5 ', the volume hologram layer 6, the second pressure-sensitive adhesive layer 5, and the surface protection film 7 are sequentially laminated.

The colored sheet 9 can be made of a polyester film, a triacetyl cellulose film, a polypropylene film, an acrylic film, or the like colored with a dye or a pigment which does not adversely affect the volume hologram recording layer. Therefore, a transparent colored sheet is used if it is necessary to see through as in the case of being laminated on the photograph of FIG. 5, and an opaque colored sheet is used if there is no need to see through. The film thickness is 10 μm to 1
The thickness is preferably set to 00 μm. By providing a color sheet 9 having a color different from or complementary to the hologram color or a black system color in the layer structure, the contrast of the hologram image can be improved.

The third pressure-sensitive adhesive layer 5 ″ may be formed in the same manner by using the above-mentioned first pressure-sensitive adhesive layer-forming material, and its adhesiveness is the same as that of the first pressure-sensitive adhesive layer 5 ′. It is good to do the same.

FIG. 5 shows the layer structure of the cross section of the first or second label for producing a volume hologram laminate of the present invention.
This will be described with reference to (a) and (b).

In the figure, reference numeral 20 denotes a label for producing a volume hologram laminate, reference numeral 11 denotes a release paper, and the same reference numerals as those in FIGS. 2 and 3 denote the same contents.

The label 20 shown in FIG.
A first pressure-sensitive adhesive layer 5 ', a volume hologram layer 6, a second pressure-sensitive adhesive layer 5, and a surface protection film 7 are laminated on the first pressure-sensitive adhesive layer 1.

As the release paper 11, a synthetic resin laminated paper, a synthetic paper, a synthetic resin film, for example, a PET film surface is released with a fluorine-based release agent, a silicone-based release agent, a stearate-based material, and other waxes. It is good to use a treated one. After peeling this release paper, the first
The volume hologram laminate shown in FIG. 2 is produced from the pressure-sensitive adhesive layer 5 'on the substrate 2 on which a photograph or the like is attached.

The label 20 shown in FIG. 5B has a third adhesive layer 5 ″, a colored sheet 9, a first adhesive layer 5 ′, a volume hologram layer 6, and a second adhesive layer 5 on a release paper 11. As shown in FIG. 3, after the release paper 11 is peeled off when the label 20 is laminated on a base material such as a certificate and a credit card, the layer 5 and the surface protection film 7 are sequentially laminated. The third pressure-sensitive adhesive layer 5 ″ is laminated on the base material 2 to produce a volume hologram laminate.

In these labels, the surface protective film surface may be subjected to a hard coat treatment if necessary, and may be subjected to a release treatment.

[0072]

The present invention will be described below with reference to examples. In the examples, "parts" indicates parts by weight. (Example 1) (Preparation of first volume hologram laminate) (Preparation of hologram recording material) On a polyethylene terephthalate film, a hologram recording material layer (film thickness: 20 μm) was formed.
m, Omnidex 706; manufactured by DuPont), and a hologram recording medium in which a polyvinyl chloride film is sequentially laminated.
A Lippmann hologram was recorded.

(Production of Silicone Separator / First Pressure-Sensitive Adhesive Layer 5 ') Silicone separator (film thickness 50 μm, S
An adhesive (Nissetsu PE-118; manufactured by Nippon Carbide Co., Ltd.) was dried on P-PET (manufactured by Tokyo Cellophane Paper Co., Ltd.) by die coating to prepare a film having a thickness of 20 μm.

(Surface protective film / second pressure-sensitive adhesive layer 5 / silicone separator) PET / acrylic pressure-sensitive adhesive layer / silicone separator (Sanitect H225E: manufactured by San-A Kaken) was used.

(Preparation of Label for Producing Volume Hologram Laminate) The polyvinyl chloride film of the hologram recording material obtained above was peeled off, and the silicone separator / first pressure-sensitive adhesive layer 5 ′ obtained above was laminated, and a PET film was formed. / Hologram layer / first pressure-sensitive adhesive layer 5 '/ silicone separator.

The PET film of this laminate was peeled off, and at the same time, the surface protective film / second pressure-sensitive adhesive layer 5 / silicone separator of the silicone separator was peeled off, and the two were laminated to form a surface protective film / second pressure-sensitive adhesive layer. 5
A hologram layer 6 / first pressure-sensitive adhesive layer 5 '/ silicone separator was obtained as shown in FIG.

(Preparation of Volume Hologram Laminate) After the silicone separator of the label obtained above was peeled off, the label was placed on a paper substrate on which a photograph was stuck from the side of the first pressure-sensitive adhesive layer 5 '.
Were laminated as shown in FIG.

After leaving this laminate for 24 hours,
The surface protection film 7 was peeled off from the volume hologram laminate.

FIG. 6 shows the measurement results of the state of the change in peel strength when the surface protective film is peeled. The state (a) in FIG. 6 corresponds to the part where the peeling line has occurred, and the peeling line is 2.
Occurred at ４4 mm intervals. Then, the surface protective film was laminated again, but the peeling line clearly remained.

(Example 2) (Preparation of second volume hologram laminate) In place of the silicone separator / first pressure-sensitive adhesive layer 5 'used for preparing the label for preparing the volume hologram laminate in Example 1, the following was carried out. A second volume hologram laminate and a label for producing a volume hologram laminate were prepared in the same manner except that the silicone separator / third pressure-sensitive adhesive layer 5 ″ / colored sheet / first pressure-sensitive adhesive layer 5 ′ was used.

Preparation of (Silicone separator / third pressure-sensitive adhesive layer 5 ″ / colored sheet / first pressure-sensitive adhesive layer 5 ′) Silicone separator (50 μm in thickness, SP-PET;
Adhesive (Nissetsu PE-) on Tokyo Cellophane Paper
118; Nippon Carbide Co., Ltd.) was applied to a dry film thickness of 10 μm, and then a transparent colored sheet (PET film dyed red, film thickness of 50 μm) was laminated. ) Was applied to a film thickness of 20 μm.

Next, after the silicone separator in the label for preparing the second volume hologram laminate prepared above was peeled off, a picture was stuck on a paper base from the third pressure-sensitive adhesive layer side. As shown in FIG. After leaving this laminate for 24 hours, the surface protection film 7 was peeled off from the volume hologram laminate.

After peeling, the surface of the hologram layer was observed, and peeling lines were generated at intervals of 2 to 4 mm. Then, the surface protective film was laminated again, but the peeling line clearly remained.

[0084]

According to the volume hologram laminate of the present invention, when the surface protective film is peeled off, a peeling line is formed. Even if an attempt is made to copy the hologram recording, the peeling line is also copied at the same time and can be distinguished from the real one. ,Also,
Even if the hologram in which the peeling line is generated is replaced on another substrate, it is possible to determine the authenticity by the presence or absence of the peeling line,
This ensures forgery prevention. Further, the label for producing a volume hologram laminate can easily produce a volume hologram laminate.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a first or second volume hologram laminate of the present invention in a front view thereof.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and is a cross-sectional view for explaining a first volume hologram laminate of the present invention.

FIG. 3 is a cross-sectional view taken along the line AA of FIG. 1, and is a cross-sectional view for explaining a second volume hologram laminate of the present invention.

FIG. 4A is a schematic cross-sectional view showing a state when the surface protective film in the volume hologram laminate of the present invention is peeled off, and FIG. 4B is a perspective view of the same.

FIG. 5 is a cross-sectional view for explaining a first or second volume hologram laminate production label of the present invention.

FIG. 6 shows a measurement result of a change in peel strength when the surface protective film is peeled off in the first volume hologram laminate of the present invention.

[Explanation of symbols]

1 is a first or second volume hologram laminate, 2 is a base material,
3 is a photo pasting glue, 4 is a face photograph, 5 is a second adhesive layer,
5 'is a first adhesive layer, 5 "is a third adhesive layer, 6 is a volume hologram layer, 7 is a surface protective film, 8 is personal information, 9
Denotes a colored sheet, 11 denotes a release sheet, and 20 denotes a label for producing a volume hologram laminate.

Claims (6)

[Claims] 1. A volume hologram laminate in which a first pressure-sensitive adhesive layer, a volume hologram layer, a second pressure-sensitive adhesive layer, and a surface protection film are sequentially laminated on a base material, wherein the second pressure-sensitive adhesive layer When the adhesiveness is made weaker than the adhesiveness of the first adhesive layer, and when the surface protective film is peeled off from the volume hologram laminate, a peeling line is generated in a direction perpendicular to the peeling direction. A volume hologram laminate characterized by the above-mentioned. 2. A third pressure-sensitive adhesive layer, a colored sheet,
A volume hologram laminate in which a first pressure-sensitive adhesive layer, a volume hologram layer, a second pressure-sensitive adhesive layer, and a surface protection film are sequentially laminated, wherein the first pressure-sensitive adhesive layer and the first pressure-sensitive adhesive layer The third adhesive layer is weaker in adhesiveness, and when the surface protective film is peeled off from the volume hologram laminate, a peeling line is generated in a direction perpendicular to the peeling direction. Volume hologram laminate. 3. The peel strength of the surface protective film from the volume hologram laminate is 0.001 kg / 25 mm to 0.1 mm.
Kg / 25 mm, and the peel strength between the substrate and the volume hologram layer is from 0.1 kg / 25 mm to 5.0 kg /.
The volume hologram laminate according to claim 1 or 2, wherein the thickness is 25 mm. 4. The volume hologram layer is made of a dry photosensitive material for volume phase hologram recording, comprising a matrix polymer, a photopolymerizable compound, a photopolymerization initiator and a sensitizing dye. The volume hologram laminate according to any one of claims 1 to 3. 5. A label for producing a volume hologram laminate used for producing the volume hologram laminate according to claim 1, wherein the first pressure-sensitive adhesive layer, the volume hologram layer, and the second pressure-sensitive adhesive are formed on release paper. Layer, a surface protection film is sequentially laminated on the volume hologram laminate, the adhesiveness of the second adhesive layer is weaker than the adhesiveness of the first adhesive layer,
A label for producing a volume hologram laminate, wherein when the surface protective film is peeled off from the volume hologram laminate, a peeling line is generated in a direction perpendicular to the peeling direction. 6. A label for producing a volume hologram laminate used for producing the volume hologram laminate according to claim 2, wherein a third adhesive layer, a colored sheet, and a first adhesive layer are formed on release paper. , Volume hologram layer, second adhesive layer,
A volume hologram laminate in which surface protective films are sequentially laminated, wherein the adhesiveness of the second adhesive layer is weaker than the adhesiveness of the first adhesive layer and the third adhesive layer, and A label for producing a volume hologram laminate, characterized in that when the surface protective film is peeled off from the volume hologram laminate, a peeling line is generated in a direction perpendicular to the peeling direction.