JP2001322393A - Transfer sheet and card with light diffraction structure manufactured using the same - Google Patents

Abstract

(57) [Problem] To provide a transfer sheet capable of easily transferring a transfer layer including an optical diffraction structure excellent in performance such as abrasion resistance, abrasion resistance and plasticizer resistance to cards such as a magnetic card. The present invention also provides a card with an optical diffraction structure which is excellent in design and security as well as the above-mentioned performance produced using the same. SOLUTION: A transfer sheet 100 is provided with, for example, a release resin layer 2 on one surface of a support sheet 1, and a transfer layer 7 having an optical diffraction structure thereon, at least a protective layer 3, and a light diffraction structure formation. The layer 4, the light reflecting layer 5, and the adhesive layer 6 are sequentially laminated and formed, and the protective layer 3 is formed of a mixed resin obtained by mixing at least a thermoadhesive resin with an ionizing radiation-curable resin. It is preferable to use a heat-sensitive adhesive for the adhesive layer 6, and the heat-resistant lubricating layer 8 on the back side of the support sheet 1 is provided as needed. Then, the transfer layer 7 having a light diffraction structure is thermally transferred to a magnetic card or the like using the transfer sheet 100 to obtain a card with a light diffraction structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer sheet and a card with an optical diffraction structure manufactured using the transfer sheet.
More specifically, a transfer sheet capable of transferring a light diffraction structure, and when the light diffraction structure is transferred to a transfer target using the transfer sheet, together with the light diffraction structure, transparency, scratch resistance, The present invention relates to a transfer sheet capable of forming a protective layer having excellent abrasion resistance, plasticizer resistance, and adhesiveness, and a card with an optical diffraction structure having the above-mentioned performance, which is manufactured using the transfer sheet.

[0002]

2. Description of the Related Art Conventionally, magnetic cards and IC cards have been used as ID cards such as bank cards, credit cards, membership cards, identification cards, and the like. Various methods have been devised, such as applying various printings, and providing optical diffraction structures such as holograms and diffraction gratings.

For example, when printing is performed on the surface of a magnetic card, printing is performed on the magnetic recording layer to conceal the magnetic recording layer, whereby the position of the magnetic recording layer is visually determined. It becomes impossible and the forgery prevention effect can be enhanced. Further, in addition to printing of patterns, display information, and face photographs, light diffraction structures such as holograms and diffraction gratings are provided. In particular, holograms can reproduce three-dimensional images. It is possible to enhance the design and at the same time, it requires advanced technology for its production,
The forgery prevention effect can be enhanced.

When such an optical diffraction structure is provided on, for example, a magnetic card, usually, from the viewpoint of simplicity of processing,
A method has been adopted in which a transfer sheet having an optical diffraction structure formed on a transfer layer is prepared, and the light diffraction structure is transferred from the transfer sheet onto a magnetic card. In addition, the light diffraction structure provided on the magnetic card has conventionally been provided on a part of the surface of the magnetic card. Is growing.

[0005]

However, when the optical diffraction structure is provided on the surface of the magnetic card with a large area, the optical diffraction structure is also provided on the magnetic recording layer. Also, as a result of the surface of the light diffraction structure being repeatedly rubbed by the magnetic head, there is a problem that the scratch resistance and abrasion resistance are insufficient and the light diffraction structure is damaged.

On the other hand, when a printing layer or an optical diffraction structure is provided on a magnetic recording layer of a magnetic card, in order to read data recorded on the magnetic recording layer, a fixed magnetic field strength is required above the magnetic recording layer. Need to be secured. For this reason, there is a limit to the thickness of the printing layer and the transfer layer of the optical diffraction structure that can be provided on the magnetic recording layer, and the thickness is preferably 8 μm or less, more preferably 6 μm or less. Usually, the limit is about 6 μm in order to conform to the ISO standard.

Therefore, even when printing is performed on the magnetic recording layer, the number of colors and the overprint thickness are limited, and the design is limited. Also, when providing an optical diffraction structure,
A protective layer can be provided to improve the scratch resistance, but the thickness cannot be easily increased, and it is necessary to improve and improve the material without increasing the thickness. was there. Further, the magnetic card may be stored in a case containing a plasticizer during carrying or storage, and depending on the type of the resin of the protective layer serving as the outermost layer, the plasticizer migrates and softens, or In addition, there was a problem that one of the cases peeled off when the case and the protective layer were blocked and forcibly peeled off.

In order to solve such a problem, a test was conducted in which an ionizing radiation-curable resin having excellent transparency, scratch resistance, plasticizer resistance and the like was used as the resin of the protective layer. When used as a transparent protective layer, the resin generally cures quickly and forms a hard film, and is excellent in abrasion resistance and plasticizer resistance.On the other hand, other layers are laminated on the film by coating. If this is attempted, there is a problem that it is difficult to obtain a sufficient adhesive strength. Therefore, when the stacking order is reversed as in the case of the transfer sheet, that is, on the support sheet, for example, a release resin layer, a protective layer, a light diffraction structure forming layer, a light reflecting layer, and an adhesive layer are sequentially stacked. In the case of producing a transfer sheet, there is a problem that the adhesive strength between the protective layer and the light diffraction structure forming layer is not sufficient, and after transfer, the outermost protective layer is easily peeled off by friction or the like.

The present invention has been made in order to solve such problems, and an object of the present invention is to provide a transfer sheet capable of easily transferring an optical diffraction structure to cards such as a magnetic card. The transfer layer containing the transferred light diffractive structure has excellent abrasion resistance, abrasion resistance, and plasticizer resistance, as well as excellent adhesiveness of each layer. For example, the light diffractive structure is located on the magnetic recording layer of the magnetic card. Even when transferred to a magnetic card, it withstands repeated friction by a magnetic head, does not damage the light diffraction structure, and can be carried or stored for a long time by putting a magnetic card in a case containing a plasticizer. The present invention provides a transfer sheet capable of transferring a light diffraction structure excellent in performance such that a transfer layer including the light diffraction structure is not softened by a plasticizer, and is provided with a scratch resistance and a scratch resistance manufactured using the transfer sheet. Abrasion resistance, plasticizer resistance, etc. The optical diffraction structure with cards with excellent performance to provide high productivity. In the present invention, the light diffraction structure refers to a structure having a structure for diffracting light, such as a hologram or a diffraction grating.

[0010]

The above objects can be attained by the present invention described below. That is, the invention described in claim 1 has at least one surface of the support sheet,
In a transfer sheet including a transfer layer including an optical diffraction structure, the transfer layer is provided from the support sheet side,
At least a protective layer, a light diffraction structure forming layer, a light reflecting layer, and an adhesive layer are formed of a laminate in which layers are sequentially laminated, and the protective layer is a mixed system in which at least a thermoplastic resin is mixed with an ionizing radiation-curable resin. The transfer sheet is formed of a resin.

In the above-described transfer sheet, in order to provide a transfer layer on one surface of the support sheet so as to be transferable, that is, to provide the transfer layer so as to be easily separated from the support sheet at the time of transfer, It is necessary to appropriately adjust the adhesive strength between the support sheet and the protective layer of the transfer layer, and for that purpose, if necessary, a release resin layer is provided on the support sheet surface, and at the time of transfer, It is preferable that the adhesive layer be separated at the interface between the release resin layer and the protective layer, since the adjustment of the adhesive strength becomes easy. Also, when using a heat transfer method using a heating medium such as a thermal head as the transfer means,
A heat-resistant lubricating layer may be provided on the other surface of the support sheet (a back surface on which the transfer layer is not provided) as necessary in order to prevent a so-called sticking phenomenon in which the support sheet is fused to the thermal head. Can be.

By adopting such a structure, when the transfer layer of the light diffraction structure is transferred to a transfer object such as a card, the transfer layer of the light diffraction structure adheres better to the outermost adhesive layer, and the release sheet is attached to the support sheet. In the case where the resin layer is provided, the transfer layer having the light diffraction structure can be more easily attached to the transfer object because the resin layer can be easily separated at the interface between the release resin layer of the support sheet and the protective layer of the transfer layer. Can be transcribed. After the transfer, the protective layer becomes the outermost layer of the transfer layer of the optical diffraction structure, and the protective layer is formed of a mixed resin obtained by mixing at least a thermoplastic resin with an ionizing radiation-curable resin. The adhesive strength between the protective layer and the light diffractive structure forming layer is improved, the protective layer does not peel off due to friction, etc., and the ionizing radiation curable resin becomes The excellent abrasion resistance, abrasion resistance, and plasticizer resistance are also maintained satisfactorily, so that a transfer layer of an optical diffraction structure excellent in these performances can be transferred.

According to a second aspect of the present invention, there is provided the transfer sheet according to the first aspect, wherein the mixed resin of the protective layer has a thermoplastic resin content of 30 to 70% by weight.

In the present invention, in order to adhere the protective layer and the light diffraction structure forming layer with sufficient strength, and to impart good scratch resistance, abrasion resistance and plasticizer resistance to the protective layer, The thermoplastic resin content of the mixed resin of the protective layer is 30 to 7
A range of 0% by weight is preferable, and a range of 35 to 45% by weight is more preferable. The content of the thermoplastic resin is 30% by weight.
When the amount is less than the above, the effect of improving the adhesion between the protective layer and the light diffraction structure forming layer becomes insufficient, and when the content of the thermoplastic resin exceeds 70% by weight, especially the plasticizer resistance decreases. Therefore, it is not preferable.

Therefore, by adopting the above configuration, in addition to the operation and effect of the invention described in the first aspect,
The adhesive strength between the protective layer and the light diffractive structure forming layer is more reliably improved, and the protective layer can also have a sufficient effect of improving scratch resistance, abrasion resistance, and plasticizer resistance.

According to a third aspect of the present invention, in a card having a light diffraction structure laminated on at least one surface, the light diffraction structure is provided on the transfer layer of the transfer sheet according to the first or second aspect. A card with a light diffraction structure provided by transfer.

By adopting such a configuration, the formation of the light diffraction structure and its protective layer is not performed directly on the card material, but is performed continuously on the long support sheet for the transfer sheet. Therefore, the productivity can be remarkably improved, and the cost burden for the occurrence loss can be reduced. The transfer sheet of the invention described in claim 1 or 2 is used for forming the light diffraction structure and its protective layer on the card. Since the heat transfer using a heating medium can be arbitrarily selected and formed by transfer, it can be used for transfer of the light diffraction structure in a large amount in the same pattern or in various different patterns. It can be efficiently transferred and formed on a card depending on the application and the purpose.
Therefore, as described in the first or second aspect of the present invention, the protective layer and the light diffraction structure forming layer have good adhesion, and are excellent in performance such as abrasion resistance, abrasion resistance, and plasticizer resistance. Card with a light diffraction structure can be manufactured with high productivity.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a transfer sheet of the present invention,
An embodiment of the invention, such as a material and a manufacturing method of a card with an optical diffraction structure manufactured using the same, will be described. [Transfer sheet] The transfer sheet of the present invention basically has a protective layer, a light diffraction structure forming layer, a light reflection layer, and an adhesive layer sequentially laminated on one surface of a support sheet as a transfer layer. It can be configured. Also, if necessary, a release resin layer for facilitating peeling of the transfer layer is provided on the surface of the support sheet on which the transfer layer is provided, and the heat-resistant lubricity is provided on the other surface of the support sheet. A layer may be provided, and a primer coat layer or an anchor coat layer may be provided on the light reflection layer, that is, between the light reflection layer and the adhesive layer.

(Support Sheet) As the support sheet used in the transfer sheet of the present invention, each layer laminated thereon, that is, a release resin layer, a protective layer, a light diffraction structure forming layer, a light reflection layer, an adhesive Heat resistance and solvent resistance when each layer of the layer is sequentially formed by coating and the like, and when the transfer layer of the formed light diffraction structure is transferred to a transfer object such as a card, a heat transfer method is usually used. Therefore, it is necessary to have heat resistance, and in addition, it is preferable to have toughness and dimensional stability, and various types of processed paper such as condenser paper and plastic films having these properties can be used. Among them, a biaxially stretched polyethylene terephthalate film (hereinafter, simply referred to as a PET film) can be suitably used because it is excellent in the above-mentioned performance and relatively inexpensive as a general-purpose film. P
When using an ET film, its thickness is 5 to 50 μm.
m is preferable, and 5 to 25 μm is more preferable in consideration of workability, tensile strength, thermal efficiency at the time of thermal transfer, and the like.

(Release Resin Layer) A release resin layer laminated by coating or the like on the surface of the support sheet on which the transfer layer is provided is well adhered to the support sheet and formed thereon. The resin of the protective layer can be peeled off relatively easily, and
It is preferable to use a resin having excellent heat resistance and solvent resistance. As such a resin, for example, various thermosetting resins having excellent crosslinking properties such as a melamine resin can be suitably used. By using such a resin while controlling the degree of crosslinking, the peeling force at the time of transfer can be appropriately adjusted. The releasable resin layer can be formed by a coating method using a reverse roll coater or the like, and its thickness may be thin, and about 0.1 to 4 μm is sufficient.

(Protective Layer) The protective layer provided on the release resin layer serves as the outermost layer of a card or the like after transfer and protects the lower light diffraction structure forming layer and the like. As described above, in addition to being excellent in transparency, scratch resistance, abrasion resistance, and plasticizer resistance, it is preferable to also have heat resistance, stain resistance, and the like.Moreover, since it is used for a transfer layer, it is laminated thereon. It is preferable to use a resin capable of adhering and laminating the light diffraction structure forming layer well. As such a resin, in the present invention,
A mixed resin obtained by mixing at least a thermoplastic resin with an ionizing radiation-curable resin is used. The mixing ratio is preferably such that the thermoplastic resin content of the mixed resin is in a range of 30 to 70% by weight, The range is more preferably from 35 to 45% by weight.

Specific examples of the ionizing radiation-curable resin include polyurethane acrylate, polyester acrylate, epoxy acrylate, polyether acrylate, and the like. These are used to adjust the viscosity or crosslink density of each prepolymer. A functional or monofunctional monomer may be added and used, or if necessary, a known photoreaction initiator or sensitizer may be added and used. In addition, a polyene / thiol-based ionizing radiation curable resin and the like are also excellent in abrasion resistance and can be preferably used. As the thermoplastic resin mixed with the ionizing radiation-curable resin as described above, it is preferable that the thermoplastic resin has a polarity and is amorphous. For example, polymethyl methacrylate (PMM)
A), polyvinyl chloride, cellulose nitrate, cellulose acetate, ethyl cellulose, polymethylstyrene, polystyrene, polycarbonate and the like can be used.

If necessary, additives such as a surfactant, an antistatic agent and an ultraviolet absorber can be added to the resin for the protective layer as described above. In addition, the method of providing a protective layer is to prepare a coating solution with the mixed resin for the protective layer,
After applying by a conventionally known roll coating method or gravure coating method, removing the solvent by hot air drying, curing the ionizing radiation-curable resin by UV (ultraviolet) irradiation or EB (electron beam) irradiation to form a protective layer. Can be formed.

The thickness of such a protective layer is 0.5 to 4.0 μm to reduce the thickness of the entire light diffraction structure transfer layer.
It is preferable to be within the range. 0.5μ of protective layer thickness
When the thickness is less than m, sufficient scratch resistance and abrasion resistance cannot be obtained, and when the thickness exceeds 4.0 μm,
There is no need for it because it is sufficient in terms of performance such as abrasion resistance and plasticizer resistance, but rather, the entire thickness of the transfer layer of the optical diffraction structure increases, for example, on the magnetic recording layer of a magnetic card. In the case of transfer, it is not preferable because magnetic recording / reading characteristics may be deteriorated.

(Light Diffraction Structure Forming Layer) On the protective layer, there is provided a light diffraction structure forming layer, that is, a layer on which a hologram or a diffraction grating is formed. The light diffraction structure itself can be used for both planar holograms and volume holograms. Specific examples are relief holograms, Lippmann holograms, Fresnel holograms, Fraunhofer holograms, lensless Fourier transform holograms, laser reproduction holograms (such as image holograms), and white light. Examples include a reproduction hologram (such as a rainbow hologram), a color hologram, a computer hologram, a hologram display, a multiplex hologram, a holographic stereogram, and a holographic diffraction grating.

The material of the formation layer for forming these light diffraction structures is polyvinyl chloride, acrylic resin (eg, PMM).
A), thermoplastic resins such as polystyrene and polycarbonate, unsaturated polyester, melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate , A thermosetting resin such as melamine (meth) acrylate or triazine acrylate can be used alone, or a mixture of the above-mentioned thermoplastic resin and thermosetting resin can be used. Or a material obtained by adding a radical polymerizable unsaturated monomer to these materials to make them ionizing radiation-curable. In addition, photosensitive materials such as silver salts, dichromated gelatin, thermoplastics, diazo photosensitive materials, photoresists, ferroelectrics, photochromic materials, thermochromic materials, and chalcogen glass can be used.

A method for forming an optical diffraction structure using the above materials can be formed by a conventionally known method.
For example, when recording an interference fringe of a diffraction grating or a hologram as a relief of surface unevenness, an original plate on which the diffraction grating or the interference fringe is recorded in the form of unevenness is used as a press mold, and the releasability is formed on the support sheet. On the protective layer of a laminated sheet in which a resin layer and a protective layer are sequentially laminated, a coating solution of the resin for the light diffraction structure forming layer is applied by means of a gravure coating method, a roll coating method, a bar coating method, or the like. A film is formed, and the original is superimposed thereon, and the two are heated and pressed by an appropriate means such as a heating roll, so that the concavo-convex pattern of the original can be duplicated. When a photopolymer is used, a photopolymer can be coated on the protective layer of the laminated sheet in the same manner, and then the original can be overlapped and irradiated with a laser beam to perform replication. As described above, the method of recording the interference fringes of the diffraction grating or the hologram on the surface of the light diffraction structure layer as the relief of the surface unevenness is particularly preferable since it has mass productivity and can reduce the cost. The thickness of such a light diffraction structure forming layer is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 0.1 to 4 μm.

(Light Reflecting Layer) When the diffraction grating or the interference fringes of the hologram is recorded as a relief of irregularities on the surface of the light diffraction structure forming layer as described above, the light reflecting layer is relieved to increase the diffraction efficiency. It is preferably formed on a surface.
When a light reflecting metal thin film is formed on the relief surface as the light reflecting layer, a reflection type light diffraction structure can be obtained. When a transparent thin film is formed on the relief surface, a transparent light diffraction structure can be obtained. These can be appropriately selected according to the purpose. As the light reflecting layer of the light diffraction structure forming layer in the present invention, since an information display and other printing layers are also provided below the light diffraction structure forming layer, it is preferable to have these transmissive properties. A material having transparency is used.

Examples of the material of such a light reflecting layer include a continuous thin film of a substance having a different refractive index from that of the light diffraction structure forming layer and a metal thin film. The thickness of the continuous thin film may be a transparent region of a material forming the thin film, but is usually 100 to 100.
1000 ° is preferred. Examples of a method for forming a continuous thin film on the relief surface include a thin film forming method such as a vacuum deposition method, a sputtering method, and an ion plating method. The continuous thin film may have a refractive index larger or smaller than that of the light diffraction structure forming layer, but the difference in the refractive index is preferably 0.3 or more, and the difference is 0.5 or more, and more preferably 1.0 or more. More preferably, there is.

As the continuous thin film having a higher refractive index than the light diffraction structure forming layer, ZnS, TiO ₂ , Al ₂ O ₃ , Sb ₂
Examples include S ₃ , SiO, TiO, and SiO ₂ . As a continuous thin film having a smaller refractive index than the light diffraction structure forming layer,
LiF, MgF ₂ , AlF _{3 and the} like can be mentioned. Also,
When the thickness is 200 ° or less, the light transmittance is relatively small, but the film is transparent and can be used as a transparent light reflecting layer. Further, a transparent synthetic resin having a different refractive index from the light diffraction structure forming layer, for example, a layer of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl acetate, polyethylene, polypropylene, polymethyl methacrylate is used for the light reflection layer. You can also.

(Adhesive Layer) An adhesive layer is provided on the light reflecting layer to complete a light diffraction structure transfer sheet. The material of the adhesive layer is preferably one that has good adhesiveness to the light reflection layer and can firmly adhere to a transfer target such as a magnetic card during transfer. Since the transfer is usually performed by a heat transfer method, a heat-adhesive resin is used for the adhesive layer. Specific examples thereof include a vinyl chloride resin, a vinyl acetate resin, a vinyl chloride-vinyl acetate copolymer resin, and an acrylic resin. Examples thereof include a series resin, a polyester series resin, a polyurethane series resin, a polyamide series resin, and a modified rubber, and a suitable one can be appropriately selected from these and used. In addition, these alone,
Alternatively, a mixture of two or more kinds may be used by further adding a hard resin, a plasticizer, and other additives as necessary.

The adhesive layer formed of the above-mentioned material is
Usually, the material can be formed by applying a solution in the form of a solution, applying the solution with a roll coater or the like, and drying.
The thickness of the adhesive layer is preferably in the range of 0.5 to 5 μm,
The range of 1.5 to 3 μm is more preferable. As described above, on the release resin layer of the support sheet, as a transfer layer of the light diffraction structure, a protective layer, a light diffraction structure forming layer, a light reflection layer,
A transfer sheet in which adhesive layers are sequentially laminated can be manufactured. The transfer layer of the light diffraction structure is preferably formed so as to have an overall thickness of 8 μm or less, and more preferably 6 μm or less.

[Regarding Card with Light Diffraction Structure] As described above, the transfer sheet of the present invention can be used, for example, when the transfer layer having the light diffraction structure is transferred onto the magnetic recording layer of a magnetic card. Without impairing the magnetic recording characteristics of the magnetic recording layer,
In addition, the protective layer on the surface of the transfer layer has scratch resistance, abrasion resistance,
By improving physical properties such as plasticizer resistance, the light diffraction structure is configured to have durability, and the main transfer target is a magnetic card, but the surface of the transfer layer of the light diffraction structure is Because of the excellent physical properties such as the abrasion resistance, abrasion resistance and plasticizer resistance, not only magnetic cards, but also general cards including IC cards, etc., and information for authentication such as passports are described. It can be widely used for certified certificates, etc.
This enhances the design and at the same time prevents forgery and the like, and improves security.

(Base Sheet) The base sheet of the card with an optical diffraction structure of the present invention includes polyvinyl chloride, polyester, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene resin, acrylic resin, polypropylene,
In addition to resin sheets such as polyethylene, aluminum,
A single or composite sheet such as a metal sheet such as copper, paper, and an impregnated paper such as resin or latex can be used.

The thickness of the base sheet varies depending on the material, but is usually in the range of about 10 μm to 3 mm. In particular, in the case of a magnetic card, when the base sheet conforms to the ISO standard, its thickness is 0.76 m.
m. When the base sheet is formed of, for example, polyvinyl chloride (hereinafter, PVC), the thickness is usually 280.
μm white PVC sheet as core sheet,
100 μm thick transparent PV on both sides
A four-layer base sheet (total thickness of 0.7) in which C sheets are stacked as oversheets and stacked by hot pressing or the like
6 mm). In this case, the magnetic recording layer
By being provided in advance in the form of a tape or the entire surface on the surface of the transparent PVC sheet (oversheet), even when in the form of a tape, it is pressed into the base sheet during lamination by hot pressing or the like, and is integrated into a smooth surface. It is laminated.

In the case where the base sheet is composed of a laminate as described above, when a solid color layer, a picture print layer, an information display print layer, etc. are provided by printing or the like, there is no particular limitation. , Printing surface under the sheet, for example,
Since printing can be performed on the core sheet, the printing layer can be freely provided regardless of the magnetic characteristics of the magnetic recording layer. For example, a colored printing layer of the same color as the magnetic recording layer may be provided on the entire surface of the core sheet, and a printed layer of a picture or information display may be provided thereon. When the magnetic card is finished, since the magnetic recording layer and the colored printing layer have the same color, the presence of the magnetic recording layer cannot be visually confirmed from the outside, and the magnetic card becomes concealed. Security can be improved.

Since the transfer layer of the light diffraction structure has the transparency of the base, the colored print layer and the picture print layer and the information display print layer provided thereon can be visually observed. Furthermore, by providing the transfer layer of the light diffraction structure in almost the entire area on the base sheet of the card, the design is improved, and at the same time, the forgery of peeling the transfer layer of the light diffraction structure and replacing it with another card is also possible. It becomes difficult and security is improved.

[0038]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the drawings, specific examples, and comparative examples. However, the present invention is not limited to these drawings and examples. Further, the same reference numerals are used for the parts having the same names in different drawings.

FIG. 1 is a schematic sectional view for explaining the structure of one embodiment of the transfer sheet of the present invention. In FIG. 1, a transfer sheet 100 is provided with a release resin layer 2 on one surface of a support sheet 1, and a protective layer 3 as a transfer layer 7 of an optical diffraction structure thereon (on the lower side in the figure). The light diffraction structure forming layer 4, the light reflecting layer 5, and the adhesive layer 6 are sequentially laminated. still,
The other surface of the support sheet 1 (upper surface in the figure)
The heat-resistant lubricating layer 8 provided as necessary is provided, for example, when a heating medium such as a thermal head is used for the transfer means. Although not shown in the figure,
After the light reflecting layer 5 is provided, a primer coat or an anchor coat is formed on the light reflecting layer 5 to protect the light reflecting layer 5 if necessary, or to improve the adhesion between the light reflecting layer 5 and the adhesive layer 6. Can be applied.

When an optical diffraction structure is provided on the surface of a magnetic card or the like, the transfer sheet 100 having the above-described structure is used, and the adhesive layer 6 is superposed on the surface of the magnetic card, for example, and the heat is applied. The transfer sheet 10 may be formed by any of a pressing device, a hot stamping device, a thermal head, or the like.
By applying heat and pressure from the back side of the adhesive layer 6, the adhesive layer 6 is melted or softened and adheres to the magnetic card surface. afterwards,
By peeling the support sheet 1, it is easily peeled at the interface between the release resin layer 2 and the protective layer 3, and the transfer layer 7 of the light diffraction structure having the protective layer 3 as the outermost layer is formed on the surface of the magnetic card. Transcribed.

FIG. 2 is a schematic sectional view illustrating the structure of an embodiment of a card with an optical diffraction structure according to the present invention. In FIG. 2, a card 200 with an optical diffraction structure has a magnetic recording layer 11 such as a tape on one surface of a base sheet 10 for a card.
Is provided thereon, and the print layer 12 is laminated thereon, and further thereon, the transfer layer 7 of the light diffraction structure of the transfer sheet 100 having the configuration shown in FIG. 1 is laminated by transfer.
Therefore, the adhesive layer 6, the light reflection layer 5, the light diffraction structure forming layer 4, and the protective layer 3 are sequentially laminated on the printing layer 12 of the base sheet 10. In this case, the printing layer 12 and the transfer layer 7 of the light diffraction structure are provided on the entire surface of one side of the base sheet 10 for a card. it can.

By adopting such a configuration, when manufacturing the card 200 with the light diffraction structure, the light diffraction structure can be prepared in advance as a transfer sheet with a protective layer. Even in the case of a large number of copies as well as a small number of copies, it can be manufactured quickly and easily. The manufactured card 200 with the light diffraction structure is, for example, the light diffraction structure on the printing layer 12 is a transparent hologram or a diffraction grating, so that both the pattern and characters of the printing layer 12 and the light diffraction structure can be used. Can be visually recognized, and the security such as forgery prevention can be improved as well as the design.

Further, since the outermost protective layer 3 of the transfer layer 7 of the light diffraction structure is formed of a mixed resin in which a thermoplastic resin is mixed with an ionizing radiation-curable resin, the ionizing radiation-curable resin alone is used. Transfer sheet 1
At the time of the production of No. 00, the protective layer 3 is formed on the release resin layer 2 by coating, drying and curing, and the light diffractive structure forming layer 4, the light reflecting layer 5, and the adhesive layer 6 are formed thereon. Even when the protective layer 3 is laminated, the adhesion between the protective layer 3 and the light diffraction structure forming layer 4 is improved, and the abrasion resistance, abrasion resistance, and plasticizer resistance of the protective layer 3 are also ionizing radiation curable. Improved by resin,
Excellent performance can be achieved. Therefore, even if the surface of the card 200 is repeatedly rubbed with a magnetic head or the like, the light diffraction structure is not damaged, and the card 200 is used or stored in a case to which a plasticizer is added. A card with an optical diffraction structure having excellent durability can be obtained without the surface being eroded.

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples. Example 1 (Preparation of Transfer Sheet) A transfer sheet having an optical diffraction structure was prepared in the following configuration. Support sheet / Releasable resin layer / Protective layer / Light diffractive structure forming layer / Light reflecting layer / Primer layer / Adhesive layer A 16 μm thick PET film (one-sided corona discharge treatment) was used as the support sheet. A resin layer of a mixture of a melamine-based resin and a cellulose acetate resin in a weight ratio of 5: 1 was used as a mold-releasing resin layer on the discharge-treated surface so that the coating amount when dried was 0.6 g / m ^2. A support sheet was formed by coating and drying, and a release resin layer was laminated on the support sheet.

On the release resin layer, as a protective layer,
A resin layer of a mixed system in which a thermoplastic resin (non-ionizing radiation-curable resin) is mixed with an ionizing radiation-curable resin at a weight ratio of 6: 4 is applied so that the applied amount after curing is 1 g / m ² , dried,
Formed upon curing. Incidentally, the ionizing radiation-curable resin, using a trifunctional acrylate, a prepolymer of pentafunctional acrylate, an oligomer, an appropriate mixture of monomers,
A photopolymerization initiator was added, and polymethyl methacrylate (PMMA) was used as the thermoplastic resin. Therefore, an ultraviolet irradiation device (output 160)
High-pressure mercury lamp of 2 W / cm).

Next, a melamine acrylate (including a prepolymer, an oligomer and a photopolymerization initiator) was coated on the protective layer as a light diffraction structure forming layer at a coating amount of 2.0 g / m ^2.
After applying a hologram relief plate on top of the hologram relief plate, press-bonding it, irradiating ultraviolet rays from the back side to cure the melamine acrylate, molding the hologram relief, peeling off the hologram relief plate, and removing the hologram relief The provided light diffraction structure forming layer was formed.

Next, on the hologram relief forming surface of the light diffraction structure forming layer, a thin film layer of TiO ₂ having a thickness of 500 ° was formed by a vacuum evaporation method to form a light reflecting layer. Then
A heat-resistant polyester-based resin layer is formed as a primer coat layer on the light reflection layer (TiO ₂ thin film layer) so that the coating amount when dried is 0.5 g / m ² and dried. did.

On the primer coat layer, a heat-sensitive adhesive layer obtained by mixing a vinyl chloride-vinyl acetate copolymer with an acrylate resin at a weight ratio of 2: 1 was used as an adhesive layer.
Coating and drying were performed so that the coating amount at the time of drying was 1.5 g / m ^2, and a transfer sheet of Example 1 was produced.

(Production of Card with Light Diffraction Structure) In order to produce a card with a light diffraction structure using the transfer sheet produced as described above, a magnetic material having a surface with a magnetic field strength of 6
On a magnetic tape laminated surface of a 0.76 mm thick polyvinyl chloride sheet (two white core sheets and two transparent over sheets, four-layer laminated structure) on which 00 [Oe] magnetic tapes (thickness: 20 μm) are laminated, Further, a card on which a pattern and characters are printed is prepared, and the printed layer is aligned with the adhesive layer surface of the transfer sheet.
The transfer layer of the light diffraction structure of the transfer sheet was transferred by thermocompression bonding under the condition of 0 kg / cm ² for 1 second, and the card with the light diffraction structure of Example 1 was produced.

[Comparative Example 1] In the structure of the transfer sheet of Example 1, only the kind of resin used for the protective layer was changed from a mixed resin obtained by mixing a thermoplastic resin to an ionizing radiation-curable resin. A transfer sheet was prepared in place of the methacrylate copolymer which had been used, and a card with an optical diffraction structure was prepared using this transfer sheet. 1 transfer sheet and a card with an optical diffraction structure.

[Performance Evaluation and Results] Using the cards with the optical diffraction structure of Example 1 and Comparative Example 1 produced as described above as samples, performance tests were performed on the following items by the following test methods, respectively. The evaluation results are shown in Table 1.

(1) Abrasion resistance test The test method uses a measuring device (Taber-type ablaser) described in 2.9 Abrasion Resistance of JIS K6902, and the test method is the same as the plastic wear test method using JIS K7204 wear wheels. And the rotation speed of the test piece rotating disc 45
± 2 rpm, wear wheel is CS-10F (US TELEDY
The method described in “8. Operation” (however, operations 8.1, 8.6, 8.7, 8.8) was performed using a load of 500 gf using ASTM D1044-82 manufactured by NE TABER.
), The degree of wear was visually determined every 100 rotations of the worn wheel, the number of times when the visibility of the optical diffraction structure of each test piece began to be impaired was recorded, and the number of times was displayed.

(2) Plasticizer resistance test The card of each sample was completely bent back and forth three times, and dioctyl phthalate (DOP) was dropped on the bent portion and the unfolded smooth portion, respectively. After being allowed to stand in a constant temperature room for one week, changes in images of the protective layer and the light diffraction structure of the bent portion and the smooth portion were examined by visual observation and finger touch. (Evaluation Criteria) ：: (Good) The protective layer has almost no change, and the image of the light diffraction structure can be seen well. ×: (Defective) The protective layer is softened or the visibility of the image of the light diffraction structure is poor. What has fallen

(3) Moisture resistance test After completely bending the card of each sample back and forth three times,
Immersed in water at ℃ for 1 week,
The changes in the protective layer and the optical diffraction structure were visually inspected for the unfolded smooth portion. (Evaluation Criteria) ○: (Good) No change in the image of the protective layer and the light diffraction structure ×: (Bad) Change in whitening or the like on the surface, resulting in reduced visibility of the image of the light diffraction structure

[0055]

[Table 1]

As is clear from the evaluation results shown in Table 1, in the abrasion resistance test using the Taber-type ab laser in (1), the card with the light diffraction structure of Example 1 was the same as the card with the light diffraction structure of Comparative Example 1. About three times more wear resistant than
Regarding the plasticizer resistance (2), in the card with the light diffraction structure of Comparative Example 1, the protective layer was softened by DOP in both the smooth portion and the bent portion, and the visibility of the image of the light diffraction structure was reduced. In contrast, the card with the light diffraction structure of Example 1 was good without being affected by DOP. (3) Regarding the moisture resistance, the card with the light diffraction structure of Example 1 was good without any change in the smooth portion and the bent portion, whereas the card with the light diffraction structure of Comparative Example 1 was good. , But there was no change in the smooth part and it was good,
In the bent part, whitening occurred on the surface, which was defective. As described above, the card with the light diffraction structure of Example 1 shows a comparative example 1 in all of abrasion resistance, plasticizer resistance and moisture resistance.
And the effect of the protective layer was observed.

[0057]

As described above in detail, according to the present invention, a transfer sheet capable of easily transferring a light diffraction structure to cards such as a magnetic card, wherein a transfer layer including the transferred light diffraction structure is provided. , In addition to scratch resistance, abrasion resistance, plasticizer resistance, moisture resistance, excellent adhesion of each layer, for example, when a transfer layer containing an optical diffraction structure is transferred onto the magnetic recording layer of a magnetic card However, it withstands the friction repeatedly performed by the magnetic head, the light diffraction structure is not damaged, and the magnetic card is stored in a case containing a plasticizer, etc.
Even when used or stored for a long period of time, it is possible to transfer an optical diffraction structure excellent in performance such that the transfer layer including the optical diffraction structure is not softened by a plasticizer or the surface is not contaminated by blocking or the like. A card with an optical diffraction structure that provides a transfer sheet and has excellent performance such as abrasion resistance, abrasion resistance, plasticizer resistance, and moisture resistance, and is also excellent in design and security. Is provided with high productivity.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating the configuration of an embodiment of a transfer sheet of the present invention.

FIG. 2 is a schematic sectional view illustrating the configuration of an embodiment of a card with a light diffraction structure of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 support sheet 2 release resin layer 3 protective layer 4 light diffractive structure forming layer 5 light reflective layer 6 adhesive layer 7 transfer layer 8 heat resistant slip layer (back layer) 10 base sheet 11 magnetic recording layer 12 print layer 100 Transfer sheet 200 Card with light diffraction structure

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B44F 1/12 B44F 1/12 G03H 1/18 G03H 1/18 F term (Reference) 2C005 HA10 HA18 HB01 HB09 JA01 JB09 KA03 KA07 KA37 LA05 LA30 2K008 AA13 EE01 GG01 GG05 3B005 EA12 EB01 EC01 EC02 FA04 FB11 FB21 FB61 FC02Y FC08Y FC12Y FC20Y FD06Y FF00 GA02 GB01

Claims (3)

[Claims] 1. A transfer sheet having a transfer layer including an optical diffraction structure provided on at least one surface of a support sheet so as to be transferable, wherein the transfer layer is at least a protective layer and a light The diffraction structure forming layer, the light reflecting layer, and the adhesive layer are formed in a laminated body in order, and the protective layer is formed of a mixed resin obtained by mixing at least a thermoplastic resin with an ionizing radiation-curable resin. A transfer sheet. 2. The transfer sheet according to claim 1, wherein the thermoplastic resin content of the mixed resin of the protective layer is 30 to 70% by weight. 3. A card having a light diffraction structure laminated on at least one surface thereof, wherein the light diffraction structure is provided by transferring a transfer layer of the transfer sheet according to claim 1 or 2. A card with a light diffraction structure.