JP2012252028A - Forgery prevention transfer foil, forgery prevention medium, forgery prevention substrate, and printed matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery prevention medium in which the reflection luminance can be further increased, a forgery prevention substrate including the forgery prevention medium, and a printed matter including the forgery prevention substrate.SOLUTION: A forgery prevention transfer foil 10 includes a diffraction grating layer 13 provided in contact with one face of a protective layer 12, and a reflective layer 14 provided on a face of the diffraction grating layer 13 on the opposite side of the protective layer 12, in which the protective layer 12 is formed of a resin containing a copolymerization structure of norbornene and ethylene.

Description

  The present invention relates to an anti-counterfeit transfer foil provided with OVD (Optical Variable Device) having an anti-counterfeit effect, an anti-counterfeit medium including the anti-counterfeit transfer foil, an anti-counterfeit base material including the anti-counterfeit medium, and the anti-counterfeit The present invention relates to a printed matter including a base material, and is particularly used for preventing counterfeiting and authenticity determination of securities (for example, banknotes, gift certificates, etc.).

Securities such as banknotes and gift certificates are often subjected to processing for preventing counterfeiting using printing technology or transfer technology.
In the presence of various processing technologies for preventing forgery, cases of using OVD are continuously increasing. This OVD is formed to include, for example, a hologram, a diffraction grating, and a multilayer film in which thin films having different optical characteristics are stacked. For this reason, since the color of OVD changes depending on the viewing angle, there are cases where a stereoscopic image using light interference or a special decorative image can be expressed. Thus, since a fine image expressed by OVD cannot be easily forged, OVD has become a representative forgery prevention technique.

  For securities, holographic transfer foil is often used in the OVD. This hologram transfer foil is formed by laminating thin films having functions such as a peeling / protecting layer, a hologram forming layer, a reflective layer, and an adhesive layer in a form supported by a plastic film. Used for about half of the unit. Thus, the hologram transfer foil is one of the most widely adopted techniques as a processing technique for preventing forgery. In addition, as said prior art, there exist some which were described in patent document 1, for example.

  By the way, as one of the hologram authenticity determination, there is a visual method using high reflection luminance. However, even a genuine hologram transfer foil may cause a large difference in reflection luminance depending on the material, configuration, and manufacturing method. In this case, since high reflection luminance cannot be obtained, there is a problem that it is difficult to determine the authenticity by visual observation. Also, in each manufacturing process of hologram transfer foil, when there are many layers to be coated due to heat, pressure, chemical reaction, etc. during coating and drying, the reflection luminance may gradually decrease from process to process. is there. In this case as well, there is a problem that it is difficult to visually determine the authenticity because high reflection luminance cannot be obtained. For example, the hologram transfer foil described in Patent Document 1 has a structure in which a protective layer is provided on a release layer on a substrate to impart resistance, but the increase in the number of layers or the number of coating steps is caused by heat, The visual brightness may be reduced due to the pressure and the refractive index difference between the layers.

Japanese Utility Model Publication No. 4-40256

  An object of the present invention has been made in view of the circumstances described above, and is a forgery-preventing transfer foil capable of further increasing the reflection luminance, a forgery-preventing medium including the forgery-preventing transfer foil, and a forgery including the forgery-preventing medium. It is providing the printed material containing a prevention base material and the said forgery prevention base material.

One aspect of the present invention for solving the above problems is a protective layer, a diffraction grating layer provided in contact with one surface of the protective layer, and the side of the diffraction grating layer opposite to the protective layer side. A forgery-preventing transfer foil, comprising a reflective layer provided in contact with the surface, wherein the protective layer is formed of a resin containing a copolymer structure of norbornene and ethylene.
According to the above aspect, since the protective layer is formed of a resin containing a copolymer structure of norbornene and ethylene, the transparency (that is, the visible light transmittance) of the protective layer is increased as compared with the prior art. Can do. Therefore, the reflection luminance can be further increased.

In another aspect of the present invention, the diffraction grating layer may be a hologram.
According to the above aspect, since the diffraction grating layer is a hologram, the light reflectance can be increased compared to the case where the diffraction grating layer is not a hologram. Therefore, the reflection luminance can be further increased.

Also, a support provided on the surface of the protective layer opposite to the diffraction grating layer side with respect to the forgery prevention transfer foil, and the reflection layer opposite to the diffraction grating layer side An anti-counterfeit medium may be added by further adding an adhesive layer provided in contact with the side surface.
According to the said aspect, since the contact bonding layer is included, the forgery prevention medium which made reflection brightness higher can be affixed on a base material (for example, paper and a film).

Moreover, the other aspect of this invention is a forgery prevention base material characterized by including the forgery prevention transfer foil of the said aspect.
According to the said aspect, the forgery prevention base material containing the forgery prevention transfer foil of the said aspect can be manufactured.
Moreover, the other aspect of this invention is a printed matter characterized by including the forgery prevention base material of the said aspect.

  According to the said aspect, the forgery prevention base material containing the forgery prevention base material of the said aspect can be manufactured.

Sectional drawing which shows the forgery prevention medium which concerns on this invention. Sectional drawing which shows the forgery prevention base material which concerns on this invention. The top view which shows the forgery prevention base material which concerns on this invention.

Hereinafter, the anti-counterfeit medium 9 and the anti-counterfeit base material 8 according to the embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a cross-sectional view showing an anti-counterfeit medium 9 according to the present invention. And FIG. 2 is sectional drawing which shows the forgery prevention base material 8 which concerns on this invention. FIG. 3 is a plan view showing the anti-counterfeit base material 8 shown in FIG.

FIG. 1 shows an anti-counterfeit transfer foil 10 formed by laminating a protective layer 12, a diffraction grating layer 13, and a reflective layer 14. Specifically, the anti-counterfeit transfer foil 10 is one of the protective layers 12. The diffraction grating layer 13 is provided on this surface. A reflective layer 14 is provided on the surface of the diffraction grating layer 13 opposite to the protective layer 12 side.
In the present embodiment, the forgery prevention medium 9 is configured by laminating the support 11 and the adhesive layer 15 on the forgery prevention transfer foil 10. Specifically, the anti-counterfeit medium 9 is provided with a support 11 on the surface of the protective layer 12 included in the anti-counterfeit transfer foil 10 on the side opposite to the diffraction grating layer 13 side. An adhesive layer 15 is provided on the surface of the reflective layer 14 included in the forgery prevention transfer foil 10 on the side opposite to the diffraction grating layer 13 side.

In addition, resins and metals that are generally used for forming each of the above layers can be used.
In addition, characters such as letters and pictures generated by the diffraction grating layer 13 are at arbitrarily desired positions within the transfer area of the forgery prevention transfer foil 10 and the positions are ± 0 relative to the arbitrarily desired positions. It may be within 5 mm.

Further, the forgery prevention medium 9 may be a hologram that has been subjected to demetallized processing that partially removes the reflective layer 14.
Further, the demetallized processing applied to the anti-counterfeit medium 9 is applied to an arbitrarily desired position with respect to a pattern such as a character or a picture generated by the diffraction grating layer 13, and the position is arbitrarily desired. It may be within ± 0.5 mm with respect to the position.

FIG. 2 shows a structure in which the anti-counterfeit transfer foil 10 and the base material 20 are bonded via the adhesive layer 15, that is, the anti-counterfeit base material 8.
The anti-counterfeit base material 8 is formed by bringing the adhesive layer 15 contained in the anti-counterfeit medium 9 and the base material 20 into close contact, and then peeling the support 11 contained in the anti-counterfeit medium 9 from the protective layer 12. can get.

Further, as the base material 20 of the anti-counterfeit base material 8, paper, a synthetic resin film, or the like can be used. For this reason, the printed matter containing the forgery prevention transfer foil 10 can be manufactured by printing on this paper, a synthetic resin film, etc. (not shown).
Examples of the present invention and comparative examples will be described below.
[Example]
The anti-counterfeit base material 8 according to the present invention was obtained as follows.
(Paper)
OCR paper was used as the paper used as the substrate 20.
(Forgery prevention transfer foil)
A PET film was used as the material of the support 11 included in the forgery prevention medium 9. Urethane resin was used for the diffraction grating layer 13. The reflective layer 14 was made of vapor-deposited aluminum. For the adhesive layer 15, a copolymer resin of vinyl chloride and vinyl acetate was used. For the protective layer 12, TOPAS5013S-04 (manufactured by Polyplastics Co., Ltd.), which is a resin mainly composed of a copolymer of cyclic olefin and ethylene, was used.

The protective layer 12 is a single thin film with high transparency. Further, “norbornene” described in the claims of the present application is a kind of cyclic olefin.
(Transfer machine)
As a transfer machine for transferring the forgery prevention transfer foil 10 (that is, the hologram transfer foil) to the base material 20, an up-down type thermal transfer apparatus manufactured by NAVITAS was used.
(Brightness measurement)
When the diffraction efficiency (luminance) after embossing when forming the diffraction grating was measured, the average value was 1.19%.

[Comparative example]
In order to compare with the anti-counterfeit transfer foil according to the present invention, the anti-counterfeit base material 8 of the comparative example was obtained as follows.
(Paper)
OCR paper was used as the paper used as the substrate 20.
(Forgery prevention transfer foil)
A PET film was used as the material of the support 11 included in the forgery prevention medium 9. Urethane resin was used for the diffraction grating layer 13. The reflective layer 14 was made of vapor-deposited aluminum. For the adhesive layer 15, a copolymer resin of vinyl chloride and vinyl acetate was used. The protective layer 12 was a composite laminate of a release layer made of polyethylene wax and a protective layer made of melamine resin.

(Transfer machine)
As a transfer machine for transferring the forgery-preventing transfer foil 10 to the base material 20, an up-down type thermal transfer apparatus manufactured by NAVITAS was used.
(Brightness measurement)
When the diffraction efficiency (luminance) after embossing at the time of forming the diffraction grating was measured, the average value was 1.06%.
From the above results, it was found that the anti-counterfeit transfer foil 10 according to the present invention has a high reflection luminance.

  The anti-counterfeit transfer foil 10 according to the present invention can impart an easy authenticity determination function to articles such as securities, and is used as a forgery-preventing member such as a banknote or an ID card.

8 Counterfeit Prevention Base Material 9 Counterfeit Prevention Medium 10 Counterfeit Prevention Transfer Foil 11 Support 12 Protective Layer 13 Diffraction Grating Layer 14 Reflective Layer 15 Adhesive Layer 20 Base Material

Claims (5)

A protective layer;
A diffraction grating layer provided in contact with one surface of the protective layer;
A reflective layer provided in contact with the surface of the diffraction grating layer opposite to the protective layer side;
The forgery-preventing transfer foil, wherein the protective layer is formed of a resin containing a copolymer structure of norbornene and ethylene.   The forgery-preventing transfer foil according to claim 1, wherein the diffraction grating layer is a hologram. For the anti-counterfeit transfer foil according to claim 1 or claim 2,
A support provided in contact with the surface of the protective layer opposite to the diffraction grating layer side;
An anti-counterfeit medium, further comprising an adhesive layer provided in contact with a surface of the reflective layer opposite to the diffraction grating layer side.   An anti-counterfeit base material comprising the anti-counterfeit transfer foil according to claim 1.   A printed matter comprising the anti-counterfeit base material according to claim 4.

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