JPH09300891A - Transfer sheet, transfer molding method of optically diffracting body, card having optically diffracting body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the transferring of optically diffracting bodies such as holograms having durability such as abrasion resistance or the like provided on a card or the like with an existing heat transferring device without any modification or alteration. SOLUTION: The transfer sheet 10 is made by providing alternately and optically diffracting layer region 1, which is produced by transferably providing optically diffracting structure forming layer and optically diffracting effect layer such as transparent reflecting layer laminated on the optically diffracting structure forming layer or the like, and protective layer region 2, which is produced by transferably providing transparent protective layer, to the longitudinal direction of the sheet. The transparent protective layer and the optically diffracting structure forming layer are made of the one and same material. Further, the transparent reflecting layer is also provided on the transparent protective layer. Furthermore, an adhesive layer is provided on the transparent reflecting layer.

Description

Detailed Description of the Invention TECHNICAL FIELD OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet for transferring and forming a light diffractive body such as a hologram, a method for transferring and forming a light diffractive body using the transfer sheet, and a resulting light diffractive body. Regarding cards that have.

[0002]

2. Description of the Related Art A technique for transferring and forming an optical diffractor such as a hologram or a diffraction grating pattern is known to prevent forgery of driver's licenses, credit cards, employee ID cards and the like. By the way, FIG. 5 shows an example in which such a light diffracting body 21 is provided on a card 20 which has a facial photograph image 22 and becomes a driver's license or an identification card. For example, overseas, there is a driver's license in which a facial photograph image, name, etc. are formed on a plastic card by the sublimation heat transfer printing method, and forgery prevention measures are particularly important, and holograms are further transferred and formed.

[0003]

In order to form a light diffracting body such as a hologram or a diffraction grating pattern on a transfer target such as a card, there is a method of sticking the light diffracting body as a label.
The sticking method is cumbersome for large-scale processing, and is easily peeled off by a label adhered with an adhesive, and the light diffractive body itself is easily forged. In this respect, the transfer method of the optical diffractive body using the transfer sheet is suitable for large-scale processing, and is less likely to be peeled off than the adhesive because of heat fusion. However, the unevenness of the interface between the two layers in the optical diffraction layer is protected from abrasion and scratches in the upper layer side after transfer formation, but in the transfer method, it is a layer to be transferred from the viewpoint of foil breakability and the like. There is a limit to the thickness, and there is also a limit to the protective performance of the upper layer.

Therefore, in order to improve the protection performance, a method of transferring a light-diffractive layer and then forming a transparent protective layer with another transfer sheet, a method of laminating a transparent film after transferring the light-diffractive layer, and the like are considered. To be In the above-mentioned driver's license, a transparent protective layer is formed by laminating a transparent film on the entire surface of the card after hologram formation. In addition to preventing scratches such as holograms, the transparent protective layer is a sublimation dye for printed characters and the like, and also prevents the dye from migrating to other objects when the card is carried.

However, transparent film lamination is not suitable for large-scale processing. On the other hand, in the method of using another transfer sheet for the transparent protective layer, a new transfer machine (a printer for a part, a heat roll for an entire surface, etc. may be used. )Is required. By the way, in the above driver's license, a facial printer image and characters such as names are transferred and printed, and in order to transfer and form a hologram, a dedicated printer equipped with a dedicated transfer sheet and a thermal head has already been installed in one device. is there. Therefore,
Further, it is conceivable to use a dedicated printer in which a transfer sheet dedicated to the transparent protective layer and a heating means such as a thermal head are further built in, but the existing device cannot be used and it is necessary to renew the device. Also becomes large.

[0006]

Therefore, in the present invention, an optical diffraction layer comprising an optical diffraction effect layer such as a transparent reflection layer and an optical diffraction structure forming layer is provided on a support so as to be transferable. A transfer sheet in which a transparent protective layer and a protective layer region provided so as to be transferable on the same support were alternately provided in the longitudinal direction. The method of transferring and forming a light diffracting body using this transfer sheet is such that first, the light diffracting layer is transferred by transfer using the light diffracting area, and then transfer using the protective layer area of the transfer sheet is already performed. The transparent protective layer was transferred and formed so as to cover the light diffractive layer so that the light diffractive body having the thick transparent protective layer could be continuously transferred by one transfer sheet. And, in the form of the transfer sheet in which the light diffraction effect layer is a transparent reflection layer,
It is possible to prevent forgery by transferring and forming a transparent light diffracting body such as a transparent hologram or a transparent diffraction grating on an image such as a face photograph so that the image can be seen through. Further, in the transfer sheet, the transparent protective layer in the protective layer region is made of the same material as the light diffraction structure forming layer, and the transparent reflective layer of the same material as the transparent reflective layer in the light diffraction region is provided on the transparent protective layer. When the adhesive layer is provided on the transparent reflection layer in the light diffraction area, the light diffraction effect layer is a transparent reflection layer, so when forming the transparent reflection layer in the light diffraction area by vapor deposition or coating, A transparent reflective layer may be continuously formed in the alternating protective layer regions, the production is easy, and since the transparent reflective layer is further protected after the transfer, a more durable optical diffractive element is obtained. can get.

In the card having the light diffracting body of the present invention, the light diffracting layer comprising the light diffracting structure forming layer and the transparent reflecting layer of the inorganic compound thin film is at least the adhesive layer, and the transparent diffracting layer made of the same material as the transparent reflecting layer. Since the light diffractive body is covered with a protective film composed of at least the second transparent reflective layer and the transparent protective layer, the second transparent reflective layer also participates in the protective function, so that more solvent resistance and scratch resistance can be obtained. It can be a light diffractor. In such a card, in the transfer sheet, the transparent protective layer in the protective layer region is made of the same material as the light diffraction structure forming layer, and the transparent reflective layer of the same material as the transparent reflective layer in the light diffraction region is formed on the transparent protective layer. It can be obtained by a transfer sheet provided with an adhesive layer on the transparent reflection layer in the protective layer region and the light diffraction region.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below from the transfer sheet thereof. FIG. 1 is a plan view showing one form of the transfer sheet of the present invention. The transfer sheet 10 of the present invention shown in FIG.
Is used as a roll in the form of a long strip, and has a light-diffraction region forming layer 1 having a light-diffraction structure forming layer on one surface of a support.
And a protective layer region 2 having a transparent protective layer are transfer sheets alternately arranged in the longitudinal direction. FIG. 2 is a cross-sectional view of one embodiment of the transfer sheet of the present invention, in which the release layer 4 is formed on one surface of the support 3 made of a polyester film or the like, and the surface serving as the light diffraction region 1 on the release layer 4 is transparent. A different light diffraction structure forming layer 5 is formed, and the light diffraction structure forming layer 5 has unevenness on the upper side of the drawing. Further, a transparent protective layer 6 continuous with the optical diffraction structure forming layer made of the same material as that of the optical diffraction structure forming layer 5 is formed on the surface to be the protective layer region 2, and on the optical diffraction structure forming layer 5 and the transparent protective layer 6. In addition, a transparent reflection layer such as an inorganic compound thin film and a light diffraction effect layer 7 and an adhesive layer 8 made of a heat-sensitive adhesive are sequentially formed. On the other hand, a back surface layer 9 is formed on the back surface side of the support 3 in order to impart heat resistance, lubricity and the like.

Support As the support 3, a long band having heat resistance is used. For example, resin films such as polyethylene terephthalate, polyimide, polymethyl methacrylate, polystyrene, polycarbonate, etc., paper such as condenser paper, etc. , Metal foils such as aluminum, etc., or a laminated body of these may also be used. The thickness of the support depends on the material, but is 1 to
It is 200 μm, preferably 5 to 50 μm. One of the preferred materials for the support is a polyethylene terephthalate film, the thickness of which is preferably 5 to 25 μm.
It is.

Peeling layer The peeling layer 4 is a layer for peeling the light diffraction layer and the transparent protective layer from the support during transfer. There is a form in which the peeling layer itself is peeled from the support and transferred to the transferred body, or a part of which is transferred to the transferred body due to cohesive failure of the peeling layer, or the peeling layer remains on the support side. If the light-diffraction structure-forming layer is releasable from the support, the release layer can be omitted.
Further, in the mode in which a part or all of the peeling layer is transferred to the transferred body, the peeled layer transferred and transferred also functions as a protective layer of the light diffraction layer, and is effective for the durability of the light diffractive body after the transfer. Available for Further, the peeling layer transferred and transferred serves as a surface to be adhered when the transparent protective layer is further formed thereon, and therefore also contributes to the adhesion of the transparent protective layer as an adhesive base layer. For this reason, in the case where a material having poor adhesion when used as a surface to be adhered from the viewpoint of unevenness forming performance and the like must be used as the light diffraction structure forming layer, this peeling layer may be used as the intermediate layer. Specific materials for the release layer include acrylic resins, cellulose resins, vinyl resins such as vinyl chloride-vinyl acetate copolymer, polyester resins, urethane resins,
An olefin resin, an amide resin, an epoxy resin or the like can be used. In the present invention, in the case of a peeling layer which transfers and transfers, since a transparent protective layer serves as an adhesive underlayer at the time of transfer formation, a usual wax or a silicone resin alone is not preferable as the peeling layer. In this respect, as the release layer, one having good adhesiveness with the material to be the adhesive layer at the time of transfer formation of the transparent protective layer is determined in combination with the adhesive layer. When an acrylic resin or a vinyl chloride-vinyl acetate copolymer is used, a cellulose resin, a vinyl chloride-vinyl acetate copolymer or the like is preferable for the release layer. The thickness of the release layer is 0.1 to 5 μm,
It is preferably 0.1 to 2 μm.

Light-Diffraction Structure-Forming Layer The light-diffraction structure-forming layer 5 is a layer in which a light-diffraction structure is formed, and has a light-diffracting ability such as a volume hologram, a relief hologram, or a light-diffraction grating such as a holographic diffraction grating. It is a layer. The light-diffraction structure forming layer can desirably increase the light-diffraction effect by the light-diffraction effect layer described below. In terms of As the light diffraction structure forming layer, polyvinyl chloride, acrylic resin such as polymethylmethacrylate, thermoplastic resin such as polystyrene and polycarbonate, or thermosetting resin such as unsaturated polyester resin, melamine resin and epoxy resin, or An ionizing radiation curable resin such as urethane acrylate, polyester acrylate, or epoxy acrylate that is cured by ultraviolet rays or electron beams, or a naturally curable resin can be used. Also, a combination of a thermosetting resin and a thermoplastic resin, an ionizing radiation curable resin and a thermoplastic resin, and the like may be used. From the viewpoint of durability such as scratch resistance and prevention of forgery, a three-dimensionally crosslinked thermosetting resin or ionizing radiation curable resin is preferable because it is hard and does not dissolve in a solvent. The thickness of the light diffraction structure forming layer is 0.5 to
5 μm.

The light diffraction structure forming layer having a relief is formed by a conventionally known method. For example, a hologram master on which interference fringes are recorded in the form of concavo-convex is used as a press mold, and a support on which a thermoplastic resin layer serving as a light-diffraction structure forming layer has been formed by coating is placed on the hologram master, and a heating roll is used. A light-diffraction structure forming layer in which the concavo-convex pattern of the hologram original plate is duplicated may be formed by a hot pressing method in which both are heated and pressed by a heating means such as. When the light-diffraction structure-forming layer is formed of a thermosetting resin or an ionizing radiation-curable resin, use a resin that is solid and thermoformable in the state before complete curing, and coat it on the support. After that, there is a method in which the uneven pattern is duplicated by heat and then completely cured by heat, ultraviolet rays, or an electron beam as in the hot pressing method. Alternatively, a method may be used in which a liquid resin is applied to a support, and then pressed in a liquid state to a press die to be cured and solidified by irradiating with an ultraviolet ray or an electron beam so as to be duplicated.

As the ionizing radiation curable resin which is solid and has thermoformability when uncured, for example, the following (1) and
There are two types of resin (2).

(1) A resin having a radically polymerizable unsaturated group in a polymer having a glass transition point of 0 to 250 ° C. For example,
It is a polymer in which a radically polymerizable unsaturated group is introduced into a prepolymer obtained by polymerizing or copolymerizing the following monomers (1) to (4) to (4) below. : N
A monomer having a hydroxyl group such as methylol acrylamide; a monomer having a carboxyl group such as acrylic acid; a monomer having an epoxy group such as glycidyl methacrylate; a monomer having an aziridinyl group such as 2-aziridinylethyl methacrylate; Monomers having amino groups such as: Monomers having sulfone groups such as 2-acrylamido-2-methylpropanesulfonic acid, Monomers having isocyanate groups (for example, 1 of 2,4-toluene diisocyanate and 2-hydroxyethyl acrylate) 1 mol of an adduct of a diisocyanate with a radically polymerizable monomer having active hydrogen, etc.): a monomer such as methyl methacrylate or styrene for controlling the glass transition point or the physical properties of a cured product. A copolymerizable monomer. In the case of a polymer or copolymer of a monomer having a hydroxyl group (a), a radically polymerizable unsaturated group is introduced by a condensation reaction of a monomer having a carboxyl group such as acrylic acid or methacrylic acid. Base,
In the case of a polymer or copolymer of a monomer having a sulfone group, the monomer having a hydroxyl group described above is subjected to a condensation reaction,
(C) In the case of a polymer or copolymer of a monomer having an epoxy group, an isocyanate group or an aziridinyl group, the above-mentioned monomer having a hydroxyl group or a monomer having a carboxyl group is subjected to an addition reaction to form a (d) hydroxyl group or a carboxyl group. In the case of a polymer or copolymer of a monomer having, a monomer having an epoxy group, a monomer having an aziridinyl group or a diisocyanate compound and a hydroxyl group-containing acrylic acid ester monomer in a 1: 1 mole adduct addition reaction, You can do it.

(2) A compound having a melting point of 0 to 250 ° C. and a radically polymerizable unsaturated group. Specifically, stearyl acrylate, stearyl methacrylate, triacryl isocyanurate, cyclohexanediol diacrylate, cyclohexanediol dimethacrylate, spiroglycol diacrylate, spiroglycol dimethacrylate, and the like. Alternatively, JP-A-5-54502
The melamine acryl compound having a melamine skeleton and an ethylenically unsaturated group, which is disclosed in Japanese Patent Laid-Open Publication No. 1994-154, etc.

A mixture of the above (1) and (2) may be used. Further, a radical polymerizable monomer may be added to them, for example, ethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetramethacrylate, etc. In the case of using an ultraviolet resin, a sensitizer such as benzoquinone, benzoin or benzoin methyl ether is added.

Light-Diffraction Effect Layer The light-diffraction effect layer 7 is, for example, a reflection layer such as an aluminum-vapor-deposited thin film or a transparent reflection layer formed of a metal compound thin film such as ZnS that is both transparent and reflective. It is a layer that increases the light diffraction effect of. If a reflection layer is used as the light diffraction effect layer, the light diffractor becomes, for example, a reflection hologram. A light-reflective metal thin film is used as the reflective layer. The light-reflecting metal thin film has a film thickness of 10 to 1 formed by vacuum deposition, sputtering, etc. of Al, Cr, Ni, Ag, Au, or the like.
It is a thin film of 0000Å, preferably 200 to 2000Å metal, metal oxide, nitride or the like. If a transparent reflection layer is used as the light diffraction effect layer, the light diffractive body becomes, for example, a transparent hologram. As the transparent reflection layer, (1) ZnS, T
Transparent thin film having a larger refractive index than the optical diffraction structure forming layer such as iO ₂ , (2) Transparent ferroelectric having a larger refractive index than the optical diffraction structure forming layer such as BaTiO ₃ , (3) Optical diffraction such as MgF ₂ A transparent thin film having a refractive index smaller than that of the structure forming layer, (4) a resin having a refractive index different from that of the light diffraction structure forming layer, (5) these (1)
A laminated body or the like in which (4) is appropriately combined is used. The thin film of the inorganic compound of (1) to (3) is formed by a method such as vacuum deposition and sputtering, and has a thickness of 10 to 10000Å, preferably 1
It is from 00 to 5000Å. One of the preferred transparent reflective layers is titanium oxide such as TiO ₂ , and its thickness is 100 to 1000Å, preferably 300 to 600.
Å. Then, the light diffraction layer is constituted by the above-mentioned light diffraction structure forming layer and this light diffraction effect layer.

Transparent protective layer As the transparent protective layer 6, it is possible to use a material different from that of the light diffraction structure forming layer and separately form the layer serving as the light diffraction structure forming layer and the transparent protective layer. If the same material as the light diffraction structure forming layer is used, both layers can be continuously formed at one time, which is desirable. For the same material, for example,
If it is a thermoplastic resin layer formed by coating, the area where the relief is formed by hot pressing becomes the light diffraction area having the light diffraction structure forming layer, and the area between the light diffraction areas is formed in the longitudinal direction without forming the relief. The thermoplastic resin layer in the area is the transparent protective layer, and becomes the protective layer area. Similarly, in the case of a thermosetting resin or an ionizing radiation curable resin, the area between the areas which form the relief and become the light diffraction area becomes the protective layer area. The material used has already been described for the light diffraction structure forming layer. However, in the case of the light-diffraction structure forming layer, it is preferable to use a resin layer obtained by curing a curable resin so that the relief does not deform or disappear due to the heat pressure during transfer, but in the case of the transparent protective layer Curing is preferable from the viewpoint of protection functions such as durability and solvent resistance, but if the protection function is not so demanded, it may be in an uncured thermoplastic state as long as it is solidified, or it may be cured after transfer. You may let me.

Adhesive Layer The adhesive layer 8 is an acrylic resin, vinyl resin such as vinyl chloride-vinyl acetate copolymer, polyester resin, urethane resin, amide resin, epoxy resin,
A conventionally known heat-sensitive adhesive such as a rubber resin is used. Thickness is 0.1-50 μm, preferably 1-10 μm
It is. When a thermoplastic resin is used for the light diffraction effect layer, it may also be used as the adhesive layer.

It is desirable to provide a back surface layer 9 on the back surface side of the back surface support 3 in order to improve the slidability with the head, particularly in the case of transferring with a thermal head. Further, the back surface layer is used also in a printer or the like so as to facilitate the conveyance of the transfer sheet and thus to prevent heat fusion of the support during transfer. As the back layer, a thermoplastic resin such as polyester resin, acrylonitrile-styrene resin, styrene resin, urethane resin, polyamide resin, melamine resin, or thermosetting resin is used.
If lubricity is desired, it is advisable to add a lubricant such as metal soap or silicone oil. The thickness of the back layer is sufficient to prevent heat fusion and slipping, and is usually 0.1.
Is about 3 μm.

The layer structure of the transfer sheet of the present invention further includes a peeling layer and a light diffraction structure forming layer, a peeling layer and a transparent protective layer, a transparent reflecting layer or a light reflecting layer and an adhesive layer. An intermediate layer may be appropriately provided between the layers such as between and to improve adhesion. To improve the adhesion between the transparent reflection layer or the light reflection layer and the adhesive layer, and between the peeling layer and the light diffraction structure forming layer, for example, a vinyl chloride-vinyl acetate copolymer, an acrylic resin, a urethane resin or the like is used. Further, formation of each layer using the above-mentioned resin is carried out by a known coating means such as a conventionally known gravure coat, gravure reverse coat, roll coat and the like. Further, as in the transfer sheet shown in FIG. 5, a sensor mark 11 for the transfer device to mechanically detect the position of a pair of the light diffraction region and the protective layer region is appropriately provided at a position that does not hinder the transfer. May be. If the sensor mark is an optical diffraction grating, it can be formed simultaneously with the optical diffraction layer.

The transfer sheet of the present invention may be used for various purposes such as a driver's license, an employee ID card, a credit card, etc., as well as for forgery prevention purposes or decoration purposes, and is durable in various applications. A light diffractor can be provided. For example, video tapes, CDs (compact discs), CDs
-ROM (read-only CD), checks, certificates, name plates, passports, books, accessories such as accessories, and stationery.

Then, the transfer forming method of the light diffracting body according to the present invention is to form the light diffracting body on the transferred body by using the above-mentioned transfer sheet. In particular, in this transfer sheet, since the light diffraction areas and the protective layer areas are alternately provided in the longitudinal direction, if only one transfer sheet is attached to the transfer device,
If you transfer the light diffraction layer of the desired pattern in the first transfer, then send the transfer sheet and transfer the transparent protective layer so as to cover the light diffraction layer transferred in the second transfer, the desired light diffraction The body can be formed. The transfer of the transparent protective layer may be wider than the already transferred light diffracting layer and may cover other portions. As a result, the light diffractive layer is protected from above by the transparent layer. This dramatically improves the durability of the light diffraction structure forming layer. In the case of the transfer sheet having the structure shown in FIG. 2, the obtained light diffractive element is, from the transfer target side, adhesive layer 8 / light diffraction effect layer 7 (transparent reflection layer) / light diffraction structure forming layer 5 / release layer 4 / Adhesive layer 8 / Transparent reflective layer (light diffraction effect layer 7) / Transparent protective layer 6 / Peeling layer 4 Therefore, in the light diffracting body, the layer having the function of protecting the light diffracting layer is: peeling layer 4 / adhesive layer 8 / transparent reflecting layer (light diffracting effect layer 7) / transparent protective layer 6 /
The layer composed of the peeling layer 4 collectively acts as a protective film.

Next, a card having the optical diffractive element of the present invention will be described. FIG. 5 shows an example thereof, in which the card 20 is provided with the light diffracting body 21 at a position overlapping the face photograph image 22. In the card of the present invention, the light diffracting body 21 is a transparent light diffracting body, and is characterized by a protective layer as illustrated in the sectional view of FIG. In the case of FIG. 5, the card 20 has a card base material 23 on which an image 24 such as a facial photograph image or characters is formed by sublimation transfer printing or the like, and further, an optical diffractive body formed by the transfer sheet of the present invention described above. 21. Layer 25 (adhesive layer, formed by using the light diffraction region in the first transfer of the transfer sheet,
The protective film 26 formed by using the protective layer region in the next transfer is laminated on the (light diffraction layer, release layer), and the content of the protective film 26 in FIG. As described above, the adhesive layer from the card substrate side, the transparent reflection layer which is the light diffraction effect layer in the light diffraction area, and the transparent protection layer made of the same material as the light diffraction structure forming layer in the light diffraction area, Further, each layer is laminated in the order of the peeling layer, and it is characterized in that the transparent reflection layer 27 is provided in the protective film 26. Moreover, in the card of the present invention, a resin is not used as the transparent reflection layer, but the thin film of the inorganic compound (1) to (3) among the transparent reflection layers described above in the transfer sheet is used. Therefore, as compared with the case where the protective film 26 is simply formed of resin, since it is a thin film of an inorganic compound that is essentially insoluble in solvents, the solvent resistance of the protective film is improved, and it is more difficult for counterfeiting.

[0025]

Next, the present invention will be described more specifically with reference to examples and comparative examples. In the text, “part” is based on weight unless otherwise specified.

Example: 100 mm long optical diffraction region and 1
A transfer sheet of the present invention having a protective layer region having a length of 00 mm alternately in the longitudinal direction was manufactured as follows. First, a coating liquid having the following composition was applied to the entire surface of one side of a polyethylene terephthalate film having a thickness of 12 μm as a support to form a back layer having a thickness of 0.5 μm. Next, each coating liquid having the following composition is applied to the entire other surface to form a release layer having a thickness of 1 μm,
An uncured UV-curable resin layer having a thickness of 3 μm and serving as a light diffraction structure forming layer and a transparent protective layer was formed. And the length is 100 mm, which becomes the light diffraction area at 100 mm intervals.
After forming the relief hologram irregularities in the area of the hot press method, the ultraviolet ray is irradiated to complete the curing of the ultraviolet curable resin layer, and the optical diffraction structure forming layer and the transparent protective layer made of the cured ultraviolet curable resin layer Layers were formed. Next, a thin film of titanium oxide (TiOx) having a thickness of 500 Å was formed on the entire surface of the light diffraction structure forming layer and the transparent protective layer to form a transparent reflection layer which became a transparent type light diffraction effect layer. Further, a coating solution having the following composition was applied on the entire surface of this transparent reflective layer to form an adhesive layer having a thickness of 3 μm, to obtain a transfer sheet of the present invention.

Back layer coating liquid styrene-acrylonitrile copolymer 18 parts Polyester resin 1 part Zinc stearyl phosphate 2 parts Toluene 36 parts Methyl ethyl ketone 44 parts Release layer coating liquid acrylic resin 22 parts Vinyl chloride-vinyl acetate copolymer 4.5 parts Cellulose resin 3 parts Silicone resin 0.5 parts Toluene 35 parts Methyl ethyl ketone 35 parts Light-diffraction structure forming layer coating liquid (= for transparent protective layer) Melamine acrylate UV curable resin 50 parts Cyclohexanone 50 parts Methyl ethyl ketone 50 parts Adhesive layer coating liquid Vinyl chloride-vinyl acetate copolymer 30 parts Acrylic resin 10 parts Fine particle microsilica (particle size 0.1 μm) 10 parts Toluene 50 parts Methyl ethyl ketone 50 parts

Next, using this transfer sheet, a transparent hologram is transferred to a part of a facial photograph image formed by the sublimation heat transfer method on a card made of vinyl chloride resin by using the light diffraction area having the hologram pattern. After that, a transparent protective layer was transferred and formed on the entire surface of the same card by using the same protective layer region of the thermal transfer sheet to obtain a card having the optical diffractive body of the present invention.

Comparative Example A card having an optical diffractor in which only a light diffraction region was used and a protective layer region was not used when a hologram was transferred and formed on a card in the example.

In contrast to the comparative example, in the cards of the examples, a protective film of about 7 μm including a light-transparent protective layer was further formed on the layer obtained by the first transfer, and therefore the card was excellent in scratch resistance. Also, since the transparent protective layer and the like are hardened resins, they have excellent solvent resistance.

[0031]

According to the present invention, the durability of the optical diffractive body such as a hologram formed on a transferred body such as a card, such as scratch resistance, is improved, and the anti-counterfeiting effect is also improved. Further, such a light diffracting body can be formed by one transfer sheet and one transfer device, and the existing device can be used as it is. Further, in the card of the present invention, since the protective film has an inorganic compound thin film that is essentially insoluble in a solvent, it is excellent in solvent resistance and scratch resistance.

[Brief description of drawings]

FIG. 1 is a plan view showing a transfer sheet of the present invention.

FIG. 2 is a cross-sectional view showing one form of the transfer sheet of the present invention.

FIG. 3 is a plan view showing another form of the transfer sheet of the present invention.

FIG. 4 is a plan view showing an example of a card having a light diffracting body.

FIG. 5 is a cross-sectional view showing one form of a card having a light diffracting body of the present invention.

[Explanation of symbols]

 1 Optical Diffraction Area 2 Protective Layer Area 3 Support 4 Release Layer 5 Optical Diffraction Structure Forming Layer 6 Protective Layer 7 Optical Diffraction Effect Layer 8 Adhesive Layer 9 Back Layer 10 Transfer Sheet 11 Sensor Mark 20 Optical Diffractive Card 21 Optical Diffraction 21 Body 22 Face photograph image 23 Card substrate 24 Image 25 Light diffraction area transfer layer 26 Protective film (protective layer area transfer layer) 27 Transparent reflective layer (inorganic compound thin film)

Claims (5)

[Claims] 1. A light diffraction layer in which a light diffraction layer including a light diffraction structure forming layer and a light diffraction effect layer laminated on the light diffraction structure forming layer is transferably provided on one surface of a support. A transfer sheet in which regions and protective layer regions in which transparent protective layers are transferably provided are alternately provided in the longitudinal direction. 2. The transfer sheet according to claim 1, wherein the light diffraction effect layer is a transparent reflection layer. 3. In the protective layer area, the transparent protective layer is made of the same material as that of the light diffraction structure forming layer, and the transparent reflective layer of the same material as the transparent reflective layer of the light diffraction area is provided on the transparent protective layer. The transfer sheet according to claim 2, wherein an adhesive layer is provided on the transparent reflection layer in the protective layer region and the light diffraction region. 4. The transfer sheet according to claim 1, 2 or 3 wherein the light diffracting regions and the protective layer regions are alternately provided in the longitudinal direction, after transfer of the light diffracting layer to the transfer object, transfer formation. A method for transferring and forming an optical diffractive element, wherein a transparent protective layer is transferred and formed by the transfer sheet used for forming the optical diffractive layer so as to cover the formed optical diffractive layer to form an optical diffractive element. 5. A card having a light diffractive element, wherein the light diffractive layer comprising the light diffractive structure forming layer and the inorganic compound thin film transparent reflective layer is at least the same as the adhesive layer and the transparent reflective layer. A card with a light diffractor, which is covered with a protective film consisting at least of a second transparent reflective layer of material and a transparent protective layer.