JP2009133019A - Anti-falsification paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide anti-falsification paper in which anti-falsification measures are taken to reversibly change transparency with temperature by using threads as a heat-sensitive recording layer and blending the threads in the paper etc. <P>SOLUTION: The anti-falsification paper is obtained by blending a substrate film 20 having the heat-sensitive recording layer 10 reversibly changing the transparency depending on the temperature as the threads 30 in the paper 40 or embedding the substrate film as the threads in the paper, or partially exposing the substrate film as the threads from the paper. The heat-sensitive recording layer 10 is prepared by successively laminating a support 1, an anchor layer 2, a light-reflecting metal layer 3, an adhesive layer 4, a recording layer 5, and a protective layer 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes securities such as banknotes, stock certificates, claims, gift certificates, lottery tickets, certificates, personal certificates such as driver's licenses, employee ID cards, student ID cards, or passport VISA pages, ID pages, covers and passbooks. More particularly, the present invention relates to a forgery-preventing sheet having a forgery-preventing measure that is extremely difficult to counterfeit or falsify with an electronic copying machine.

  Conventionally, paper has been widely used as brand protection for banknotes, securities having a monetary value such as lotteries and gift certificates, passports, identification cards such as driver's licenses, security labels, and the like.

  In order not to easily forge or tamper with such securities paper, identification paper, etc., watermarks are made on the paper itself, special printing such as micro letters, intaglio printing, hidden letters, fluorescent printing, etc., metal A glossy foil, a hologram foil, or the like is applied by transfer or sealing.

  However, none of these anti-counterfeiting measures changed depending on the ambient temperature.

On the other hand, as a thermal recording medium whose transparency reversibly changes depending on the temperature, for example, as disclosed in Patent Document 1, two state transition temperatures T _{1 are set to} a temperature higher than a specific temperature T ₀ near room temperature. It has T ₂ , and when the recording layer is heated and held at T ₂ or higher and then cooled to T ₀ or lower, it becomes white turbid and its light scattering property is increased so as to be in the maximum light shielding state. There is a configuration in which when the recording layer is heated to T ₁ or more and less than T ₂ and then cooled to T ₀ or less, the light scattering property is reduced and the recording layer becomes transparent (see, for example, Patent Document 1).

The said prior art document is shown.
Japanese Patent No. 2701624.

  In the present invention, for example, the heat-sensitive recording layer described in Patent Document 1 is threaded into a paper, embedded in paper, or partially exposed from paper, and the transparency is reversible depending on the temperature. It is an object of the present invention to provide a forgery-preventing sheet having a forgery-preventing measure that changes with time.

  The invention according to claim 1 of the present invention is an anti-counterfeit paper characterized in that a base film provided with a thermosensitive recording layer whose transparency changes reversibly depending on temperature is encased in paper as a thread. is there.

  The invention according to claim 2 of the present invention is a forgery-preventing paper characterized in that a base film having a heat-sensitive recording layer whose transparency changes reversibly depending on temperature is embedded in paper as a thread. .

The invention according to claim 3 of the present invention is characterized in that the base film provided with the thermosensitive recording layer whose transparency changes reversibly depending on temperature is partially exposed from paper as a thread. It is paper.

As described above, according to the present invention, the base film provided with the heat-sensitive recording layer whose transparency changes reversibly depending on the temperature is encased or embedded in the paper as a thread. Therefore, variable information can be put into a thread, and an on-demand thread is possible.
In addition, by applying the property of becoming cloudy depending on the temperature, it can be seen in a pattern from the top of the paper due to the difference in light transmittance between the cloudy part and the transparent part, and it looks like white watermark paper.
Furthermore, copying with a copier or the like becomes impossible by using threads.

  As described above, the anti-counterfeit paper of the present invention has the following effects. In other words, the forgery prevention effect can be enhanced by partially exposing the base film provided with the heat-sensitive recording layer as a thread. By using a thermal recording layer whose transparency changes reversibly depending on the temperature as a thread, variable information can be put into the thread, and an on-demand thread is possible. Applying the property of white turbidity depending on the temperature, it can be seen as a pattern from the top of the paper due to the difference in light transmittance between the white turbid part and the transparent part, and it looks like white watermark paper. Furthermore, copying with a copier or the like becomes impossible by using threads.

The present invention will be described in detail below based on one embodiment.
The anti-counterfeit paper (100) of the present invention has a base film (20) provided with a thermosensitive recording layer (10) whose transparency changes reversibly depending on temperature, as shown in FIGS. 1 and 2, for example. The thread (30) is inserted into the paper, embedded in the paper, or partially exposed from the paper.

  First, the thermosensitive recording layer (10) will be described. As described in Japanese Patent No. 2701624, the heat-sensitive recording layer (10) includes a support (1) which is a base film made of a transparent polyester sheet, and an anchor provided on the support. Layer (2), light-reflective metal layer (3) provided on the anchor layer, adhesive layer (4) provided on the light-reflective metal layer, and recording layer provided on the adhesive layer The main part is composed of (5) and the protective layer (6) provided on the recording layer.

  The thermosensitive recording layer (10) is manufactured through the following steps.

  That is, on the support (1) made of a transparent polyester sheet having a thickness of 12 μm, the anchor layer composition having the following composition was applied with a wire bar, dried at 100 ° C. for 5 minutes, and thermally cured, An anchor layer (2) having a dry film thickness of 1.5 μm was formed.

Composition for anchor layer Polyester resin 10 parts Isocyanate 0.1 part Triethylenediamine 0.01 part Toluene 45 parts 2-butanone 45 parts.

  After aluminum was vacuum-deposited on the anchor layer to provide a light-reflective metal layer (3) having a thickness of 50 nm, an adhesive layer composition having the following composition was also applied to the wire bar on the light-reflective metal layer. And then dried at 90 ° C. for 5 minutes to form an adhesive layer (4) having a dry film thickness of 0.5 μm.

Composition for adhesive layer Polyparabanic acid resin 10 parts Acetone 80 parts Dioxane 10 parts.

  Next, on the adhesive layer, the following recording layer composition dissolved uniformly is applied with a wire bar and dried at 110 ° C. for 3 minutes to form a recording layer (5) having a dry film thickness of 9 μm. A protective layer composition having the following composition was applied onto the recording layer using a wire bar and dried at 90 ° C. for 3 minutes, and then the support was placed on a conveyor and a speed of 10 m / min. The film is moved under the above conditions, and the ultraviolet ray is uniformly irradiated from a position of 10 m in height by a high pressure mercury lamp (80 W / cm, ozone condensing type), and the protective layer composition is photocured to obtain a cured film thickness. A 5 μm-thick protective layer (6) was formed to obtain a thermosensitive recording layer (10).

Composition for recording layer Behenic acid 95 parts Alicyclic dicarboxylic acid compound 5 parts
(1,4-ciscyclohexanedicarboxylic acid)
Vinyl chloride-vinyl acetate copolymer 300 parts Toluene 300 parts Tetrahydrofuran 1200 parts.

Composition for protective layer 100 parts of polyfunctional polyester acrylate emulsion
(Solid content 40% by weight)
Lubricant (special polymer silicone resin solution) 5 parts Photoinitiator 2 parts.

  The base film (20) is a support and is provided with a transparent plastic film or sheet, a plastic film or sheet mixed with a colorant such as a dye or pigment, and a light-reflective metal layer such as aluminum. A plastic film or sheet is preferably used.

  As for the application of the recording layer (5) to the base film, the recording layer can be applied after applying the anchor layer (2) on the base film in advance as described above.

  A solvent-based or water-based adhesive layer (15) is applied to the opposite surface of the base film (20) provided with the recording layer (5) with a wire bar or the like.

  Finally, it is slit to a width of about 0.5 to 20 mm to form a thread-like thread (30) (see FIG. 3).

The thread (30) is inserted into the paper (40), embedded in the paper, or partially exposed from the paper at the paper making stage to form the anti-counterfeit paper (100) of the present invention.
The heat-sensitive recording layer becomes cloudy at the paper making stage.

For example, after processing the anti-counterfeit paper of the present invention into a gift certificate (50), the thread portion (30) is heated on the thread by a technique such as using a hot stamp, and the heat-sensitive recording layer (10 ) Can be made transparent (see FIG. 4).

  That is, in the present invention, the heat-sensitive recording layer can be seen as a pattern from the top of the paper due to the difference in light transmittance between the white turbid portion (31) and the transparent portion (32) by applying the property of white turbidity depending on the temperature. Yes (see FIG. 5).

It is block explanatory drawing which shows one Example of the procedure which manufactures the forgery prevention paper of this invention. FIG. 3 is a cross-sectional explanatory view showing an example of a layer structure of a heat-sensitive recording layer used in the anti-counterfeit paper of the present invention. FIG. 3 is a cross-sectional explanatory view showing an embodiment of a layer structure of threads used in the anti-counterfeit paper of the present invention. One Example of the gift certificate produced using the forgery prevention paper of this invention is shown, (a) is plane explanatory drawing, (b) is A-A 'sectional explanatory drawing of (a). FIG. 5 is an explanatory plan view showing an embodiment in which the gift certificate of FIG. 4 is patterned with heat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Support body 2 ... Anchor layer 3 ... Light reflective metal layer 4 ... Adhesive layer 5 ... Recording layer 6 ... Protective layer 10 ... Thermal recording layer 15 ... Adhesive layer 20 ... Base material Film 30 ... Thread 31 ... Cloudy part 32 ... Transparent part 40 ... Paper 50 ... Gift certificate 100 ... Anti-counterfeit paper

Claims (3)

  An anti-counterfeit paper characterized in that a base film provided with a heat-sensitive recording layer whose transparency changes reversibly depending on temperature is encased in paper as a thread.   An anti-counterfeit paper, characterized in that a base film provided with a heat-sensitive recording layer whose transparency changes reversibly depending on temperature is embedded in paper as a thread.   An anti-counterfeit paper, characterized in that a base film provided with a heat-sensitive recording layer whose transparency changes reversibly depending on temperature is partially exposed from the paper as a thread.

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