JP3395322B2 - Transfer foil for forgery prevention - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer foil, and more particularly to a transfer foil for preventing forgery which makes it difficult to forge or falsify.

[0002]

2. Description of the Related Art Conventionally, means for preventing forgery has been such that it is difficult to imitate the article itself, or by attaching something difficult to imitate to the article as proof of authenticity, There is something that makes it possible to distinguish between genuine and fake. For example, in the former, fine processing is applied to itself, such as securities such as banknotes, or it is colored in a color that is difficult to imitate. This makes it possible to prevent illegal copying by making it difficult to forge.

Further, due to advances in printing reproduction technology or advances in digital technology such as copying machines, it becomes possible to easily reproduce even if fine processing as described above is performed or colors are hard to imitate. In response to various technologies, processing technology is becoming finer, making it more difficult to copy and forge.

Since the latter is only attached to an article and is easy to handle, it has been widely used. For example, there is a seal on which an image formed of a relief hologram is formed. This has an effect that a hologram image is formed in an uneven shape and can be mass-produced by embossing. In particular, considering the layer structure, it is difficult to peel off the seal, or it is configured to make it difficult to regenerate after peeling, if you stick it on a card, banknote, certificate etc. once as an object of use, peel it off It is possible to tell at a glance that some or all of the hologram has been destroyed and that some kind of alteration such as falsification has been made to the article as well as forgery.

Further, since the formation of a molded body, that is, a three-dimensional object is limited by the shape and may not be possible depending on the shape, a transfer method is considered. There is also one in which a hologram image can be directly formed in another form such that the hologram image is used as a transfer foil.

Further, in the transfer foil having the anti-counterfeit function, it can be easily discriminated whether it is a genuine article or a counterfeit article, it is difficult to discriminate the constitution of the transfer foil itself, and the anti-counterfeit function does not change due to the surrounding environment. There is a request.

[0007]

However, since the true / false discrimination due to the high degree of miniaturization is overlooked unless a very careful view such as enlarging a fine portion or comparing with a genuine article is overlooked. In addition, the brightness of the place and the confirmation time must be taken sufficiently, and it is becoming inconsistent with the actual transaction status. Moreover, even if the material is special, it cannot be made to be a peculiar material, and the cost becomes high, which is not realistic.

Further, since the hologram as described above has a simple hologram principle and a simple structure such as layers, it is apt to be forged, so that the anti-counterfeiting effect due to the hologram is weakened.

Therefore, the present invention is a forgery-preventing transfer foil having a unique color tone that makes it difficult to discriminate the layer structure and the constituent materials and allows true / counterfeit discrimination, and satisfies the demand for the forgery-preventing transfer foil. Another object of the present invention is to provide an optical anti-counterfeit transfer foil, which is formed by laminating ceramics that can be transferred to a three-dimensional object such as a molded body.

[0010]

According to a first aspect of the present invention, a release layer, a functional layer, and an adhesive layer are sequentially provided on a base material, and the functional layer has a plurality of ceramic materials having different refractive indexes. Ri Na by laminating, and color by the angle that the functional layer is seen
Is a transfer foil for forgery prevention, which is characterized by different appearances .

The invention according to claim 2 is based on the invention according to claim 1, wherein the functional layer comprises a combination of a high refractive index layer and a low refractive index layer, and a transfer for preventing forgery. It is a foil.

The invention described in claim 3 is the same as claim 1,
On the premise of the invention described in 2, the functional layer is a laminated body of ceramic materials having different refractive indexes, and a combination of a high refractive index layer and a low refractive index layer is alternately arranged, which is a forgery. It is a transfer foil for prevention.

The invention described in claim 4 is the invention according to claims 1 to
Given the invention as set forth in any one of 3, the functional layer is magnesium fluoride, calcium fluoride, cerium fluoride, aluminum fluoride, silicon dioxide, aluminum oxide, and any one of magnesium oxide, nitrous sulfide
Lead, zirconium dioxide, titanium dioxide, cerium dioxide
Aluminum, magnesium oxide, zinc oxide, indium oxide
The transfer foil for forgery prevention according to any one of claims 1 to 3, wherein the transfer foil is a laminated body formed by a combination with one of the gaps .

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

The invention described in claim 5 is the invention according to claim 1
Based on the invention described in any one of 3 above, the functional layer
Is a laminated body of ceramic materials with different refractive indices.
A colored layer is provided on the surface of the adhesive layer side.
The transfer foil for forgery prevention according to any one of Items 1 to 4.

The invention described in claim 6 is from claim 1
Based on the invention described in any one of 5 above, the release layer and
A protective layer is provided between the functional layers.
The transfer foil for forgery prevention according to any one of Items 1 to 5.

The invention described in claim 7 is the invention according to claim 1
Based on the invention described in any one of 6 above, the release layer is
It is formed in a pattern shape.
6. A transfer foil for forgery prevention according to any one of 6

The invention described in claim 8 is the invention defined in claims 1 to 1.
Based on the invention described in any one of 6 above, the adhesive layer is
It is formed in a pattern shape.
The forgery-preventing transfer foil according to any one of 6 above.

[0024]

The anti-counterfeit transfer foil of the present invention has a property of reflecting or transmitting light rays in a specific wavelength region by alternately combining a low refractive index ceramic and a high refractive index ceramic in the functional layer, Moreover, since the film thickness of the functional layer is changed by changing the viewing angle, the wavelength regions of transmission and reflection are shifted, and the colors appear different, which makes it easy to discriminate.

By forming a colored layer in the lower layer,
The transfer foil can be colored without affecting the color change of the transmitted light or the reflected light and the transfer of the functional layer to the transfer target substrate, making it easier to see and selecting the color type. . Further, by forming the release layer or the adhesive layer in a pattern, it is possible to form a specific pattern, mark, character or the like having the above optical characteristics.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a forgery prevention transfer foil of the present invention, FIG. 2 is a sectional view showing the structure of a forgery prevention transfer foil of another embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view showing a structure and a transfer state of a forgery prevention transfer foil of another embodiment, and FIG. 4 is a cross-sectional view showing a structure and a transfer state of a forgery prevention transfer foil of another embodiment of the present invention. 5 is an explanatory view for explaining the transfer state by the forgery prevention transfer foil of the embodiment in FIGS. 3 and 4, and FIGS. 6 and 7 show the visible spectrum of the functional layer by the forgery prevention transfer foil of the present invention. FIG. 8 is a graph showing the same, and FIG. 8 is a graph showing the visible spectrum of a transfer foil as a comparative example with respect to the transfer foil for forgery prevention of the present invention.

1 shows a transfer foil for forgery prevention of the present invention, in which a peeling layer 3, a protective layer 4, a functional layer 5 and an adhesive layer 6 are sequentially laminated on a base material 2. The functional layer 5 is a ceramic layer including a high refractive index layer 7 and a low refractive index layer 8. The protective layer 4 can be provided as needed.

Next, FIG. 2 is a cross-sectional view showing the structure of a transfer foil 11 for forgery prevention of another embodiment of the present invention, in which a peeling layer 3, a protective layer 4, a functional layer 5 and a coloring layer are formed on a base material 2. 9 and the adhesive layer 6 are sequentially laminated. The functional layer 5 is a ceramic layer including a high refractive index layer 7 and a low refractive index layer 8. The protective layer 4 can be provided as needed.

The base material 2 is a base sheet of transfer foil, and may have a certain degree of rigidity and surface smoothness.
It is not particularly limited, and examples thereof include polymer films such as polyester films and polyolefin films.

The release layer 3 is not particularly limited,
It suffices that it has stability in post-processing. For example, there are thermoplastic acrylic resins, chlorinated rubber resins, vinyl chloride-vinyl acetate copolymer resins, cellulose resins, chlorinated polypropylene resins, or those obtained by adding oil silicone, fatty acid amide, or zinc stearate. It may also be an inorganic substance. The peeling layer 3 may be formed in a pattern, and any pattern can be used as long as it can be visually discriminated, and a specific pattern, mark, character or the like can be used, and can be arbitrarily selected according to the intended use.

The protective layer 4 can be selected from various compositions depending on the use and purpose as long as it does not affect the functional layer 5. For example, polyolefin, polyvinyl chloride, polyvinylidene chloride, polyvinyl can be selected. Optically transparent materials such as alcohol or plastics such as polyethylene terephthalate are laminated.

The functional layer 5 is formed by alternately laminating a plurality of ceramics having different refractive indexes with a specific film thickness.
As the low refractive index layer 8, magnesium oxide (refractive index n =
1.6), silicon dioxide (n = 1.5), and magnesium fluoride (n = 1.4), and titanium dioxide (n = 2.4) and zirconium dioxide as the high refractive index layer 7. (N = 2.0) and zinc sulfide (n = 2.3) and one of them are laminated in a predetermined thickness. The functional layer 5 can also be provided with a plurality of layers made of the above combinations. In the present embodiment, materials other than those listed above can be used as long as they satisfy the laminating conditions of the constituent layers.

The optical path length in the thin film is changed by reflecting or transmitting a light ray in a predetermined wavelength range to the functional layer 5 and changing the viewing angle, and the color of the transmitted light or the reflected light is changed. . As a result, the anti-counterfeit property is exhibited.

Since the protective layer 4 of the anti-counterfeit transfer foil 1 of FIG. 1 is an organic polymer and has a low refractive index, it is desirable that the next layer in contact with the protective layer 4 has a high refractive index. Generally, the spectral characteristics change according to the number of layers. The forgery-preventing transfer foil 1 of this embodiment has an even number of layers including the protective layer 3, but an odd number of functional layers. Further, by providing the colored layer 9 with a ceramic or colored transparent ink, the color change becomes diversified and easy to see, so that the forgery prevention effect is improved.

Any film forming method can be used for the functional layer 5 as long as the film thickness can be controlled. Among them, the dry method is superior for the formation of a thin film, and includes a normal vapor deposition method, a physical vapor deposition method such as sputtering, and a CVD method.
Chemical vapor deposition methods such as the method can be used.

The total thickness of the functional layer 5 is preferably 1 μm or less. If it exceeds 1 μm, the flexibility becomes poor and the functional layer 5
This is because cracks may occur in the.

The adhesive layer 6 may be a commonly used one as long as it does not alter or damage the functional layer 5 when it comes into contact with the functional layer 5. For example, a vinyl chloride-vinyl acetate copolymer, an acrylic adhesive or a polyester adhesive layer may be used. Examples include, but are not limited to, polyamides. The adhesive layer 6 may be formed in a pattern, and any material that can be visually discriminated may be used, and a specific pattern, mark, character or the like may be used, and each may be arbitrarily selected according to the application.

FIG. 3 is a sectional view showing the structure and transfer state of the forgery-preventing transfer foil 12 according to another embodiment of the present invention. The substrate 2, the patterned release layer 3, the protective layer 4, and the functional layer 5 are shown. The adhesive layer 6 is sequentially laminated. By forming the peeling layer 3 in a pattern, as shown in FIG. 5, when the transfer surface of the forgery prevention transfer foil 12 and the transfer surface of the transfer base material 14 are pressed together, the forgery prevention transfer foil 12 is pressed. Is transferred to the surface of the transferred substrate 14 only on the portion where the release layer 3 is formed, and only the portion formed of the protective layer 4, the functional layer 5 and the adhesive layer formed in a pattern on the transferred substrate 14 surface. Once formed, the anti-counterfeit pattern 10 appears. The protective layer 4 can be provided if necessary.

Similarly, FIG. 4 is a sectional view showing the structure and transfer state of the forgery-preventing transfer foil 13 according to another embodiment of the present invention. The base material 2, the peeling layer 3, the protective layer 4, the functional layer 5, The patterned adhesive layer 6 is sequentially laminated. By forming the adhesive layer 6 in a pattern, as shown in FIG. 5, when the transfer surface of the forgery prevention transfer foil 12 and the transfer target surface of the transfer base material 9 are pressed together, the forgery prevention transfer foil 12 is pressed. Is only the portion where the release layer 3 is formed on the surface of the transferred substrate 14,
Pattern-formed protective layer 4, functional layer 5, and adhesive layer 6
Only the portion consisting of is formed on the surface of the transferred substrate 14, and the forgery prevention pattern 10 appears. The protective layer 4 can be provided if necessary.

As a method for forming the peeling layer 3 and the adhesive layer in a pattern form, conventionally known gravure printing or the like can be used.

[0041]

The present invention will be described in detail with reference to examples.
The visible spectrum of the transfer foil prepared for comparison with the created anti-counterfeit transfer foil of the present invention and the anti-counterfeit transfer foil of the present invention was measured by an ultraviolet / visible spectrophotometer, and the patterning test A pattern as shown in FIG. 5 was formed on the transfer foil, and was actually transferred to the transfer target substrate to evaluate the transfer state.

Example 1 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, silicon dioxide is used as the low refractive index layer 8 and the high refractive index layer 7 is used.
Zinc sulfide was used as the material, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil.

Table 1 shows the constitution, layer state and evaluation results of the forgery-preventing transfer foil of this example. The visible spectrum of this anti-counterfeit transfer foil is shown in FIG. The central wavelength of absorption of visible light perpendicular to the film is 550 nm.
When incident at an angle of 45 degrees, the central wavelength shifted to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 2 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, silicon dioxide is used as the low refractive index layer 8 and the high refractive index layer 7 is used.
Titanium dioxide was used as the material, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The central wavelength of absorption of visible light perpendicular to the film is 550
When the visible light is incident at an angle of 45 degrees, the center wavelength shifts to the lower wavelength side and a color change occurs. The transferability of the anti-counterfeit transfer foil was good.

Example 3 A polyester film having a thickness of 12 μm was used for the substrate 2, and a thermoplastic acrylic resin containing oil silicone was used for the release layer 3. In the functional layer 5, silicon dioxide is used as the low refractive index layer 8 and the high refractive index layer 7 is used.
Zirconium dioxide was used as the number of layers, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the constitution, layer states, and evaluation results of the forgery-preventing transfer foil of this example.
Shown in. The central wavelength of absorption of visible light perpendicular to the film is 5
The wavelength was 50 nm, and when the visible light was incident at an angle of 45 degrees, the center wavelength was shifted to the low wavelength side, and a color change was caused. The transferability of the anti-counterfeit transfer foil was good.

Example 4 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and zinc sulfide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the constitution, layer states, and evaluation results of the forgery-preventing transfer foil of this example.
Shown in. The central wavelength of absorption of visible light perpendicular to the film is 5
It was 50 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change.
The transferability of the anti-counterfeit transfer foil was good.

Example 5 A 12 μm-thick polyester film was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and titanium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light was incident at an angle of 45 degrees, the center wavelength shifted to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 6 A polyester film having a thickness of 12 μm was used for the base material 2, and a thermoplastic acrylic resin added with oil silicon was used for the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and zirconium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 7 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, magnesium oxide was used as the low refractive index layer 8 and zinc sulfide was used as the high refractive index layer 7, and the number of layers was five.
The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The central wavelength of absorption of visible light perpendicular to the film is 550
was nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 8 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, magnesium oxide was used as the low refractive index layer 8 and titanium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the constitution, layer states, and evaluation results of the forgery-preventing transfer foil of this example.
Shown in. The central wavelength of absorption of visible light perpendicular to the film is 5
It was 50 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change.
The transferability of the anti-counterfeit transfer foil was good.

Example 9 A polyester film having a thickness of 12 μm was used for the base material 2, and a thermoplastic acrylic resin containing oil silicone was used for the release layer 3. In the functional layer 5, magnesium oxide is used as the low refractive index layer 8 and zirconium dioxide is used as the high refractive index layer 7, and the number of layers is 5
Layered. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 10 A polyester film having a thickness of 12 μm was used for the substrate 2, and a thermoplastic acrylic resin was used for the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and titanium dioxide was used as the high refractive index layer 7, and the number of layers was five. Total film thickness is 1μ
m. After the functional layer 5 was formed on the base material 2, the colored layer 8 and the adhesive layer 6 were provided thereon to form a transfer foil.

Table 1 shows the constitution, layer states and evaluation results of the forgery-preventing transfer foil of this example. The visible spectrum of this anti-counterfeit transfer foil is shown in FIG. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. In addition, the adhesion of the functional layer to the transferred substrate by the anti-counterfeit transfer foil was good.

Example 11 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3 to form a pattern by gravure printing. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and zirconium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the constitution, layer states, and evaluation results of the forgery-preventing transfer foil of this example.
Shown in. The central wavelength of absorption of visible light perpendicular to the film is 5
It was 50 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change.
The transferability of the anti-counterfeit transfer foil was good.

Example 12 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and zirconium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 13 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, calcium fluoride was used as the low refractive index layer 8 and zinc oxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The central wavelength of absorption of visible light perpendicular to the film is 55
It was 0 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 14 A 12 μm-thick polyester film was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, cerium fluoride was used as the low refractive index layer 8 and indium oxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the constitution, layer states, and evaluation results of the forgery-preventing transfer foil of this example.
Shown in. The central wavelength of absorption of visible light perpendicular to the film is 5
It was 50 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change.
The transferability of the anti-counterfeit transfer foil was good.

Example 15 A 12 μm-thick polyester film was used as the base material 2, and a thermoplastic acrylic resin added with oil silicone was used as the release layer 3. In the functional layer 5, cerium fluoride is used as the low refractive index layer 8 and zirconium dioxide is used as the high refractive index layer 7, and the number of layers is 5
Layered. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 16 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, cerium fluoride was used as the low refractive index layer 8 and cerium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the constitution, layer states, and evaluation results of the forgery-preventing transfer foil of this example.
Shown in. The central wavelength of absorption of visible light perpendicular to the film is 5
It was 50 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change.
The transferability of the anti-counterfeit transfer foil was good.

Example 17 A polyester film having a thickness of 12 μm was used for the base material 2, and a thermoplastic acrylic resin containing oil silicone was used for the release layer 3. In the functional layer 5, aluminum fluoride was used as the low refractive index layer 8 and tantalum oxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. Functional layer 5 on substrate 2
After the formation, the adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 18 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3. In the functional layer 5, aluminum fluoride was used as the low refractive index layer 8 and zinc oxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The central wavelength of absorption of visible light perpendicular to the film is 55
It was 0 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 19 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, aluminum fluoride is used as the low refractive index layer 8 and indium oxide is used as the high refractive index layer 7, and the number of layers is 5
Layered. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 20 A 12 μm-thick polyester film was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3. In the functional layer 5, aluminum oxide was used as the low refractive index layer 8 and zinc sulfide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The central wavelength of absorption of visible light perpendicular to the film is 55
It was 0 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 21 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, aluminum oxide was used as the low refractive index layer 8 and cerium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. Functional layer 5 on substrate 2
After the formation, the adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 22 A 12 μm-thick polyester film was used as the base material 2, and a thermoplastic acrylic resin was used as the release layer 3. In the functional layer 5, aluminum oxide was used as the low refractive index layer 8 and titanium dioxide was used as the high refractive index layer 7, and the number of layers was five. Total film thickness is 1 μm
And After forming the functional layer 5 on the base material 2, the colored layer 8 and the adhesive layer 6 were provided thereon to form a transfer foil.

Table 1 shows the structure of the forgery-preventing transfer foil of this example, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. 45 visible light
The center wavelength was shifted to the lower wavelength side when the light was incident at an angle of 10 degrees, resulting in a color change. In addition, the adhesion of the functional layer to the transferred substrate by the anti-counterfeit transfer foil was good.

Example 23 A 12 μm-thick polyester film was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3 and patterned by gravure printing. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and titanium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 24 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicone was used as the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and titanium dioxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. Functional layer 5 on substrate 2
After the formation, a patterned adhesive layer 6 was provided to obtain a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 25 A polyester film having a thickness of 12 μm was used for the substrate 2, a thermoplastic acrylic resin containing oil silicone was used for the release layer 3, and patterned by guavia printing. In the functional layer 5, cerium fluoride was used as the low refractive index layer 8 and cerium dioxide was used as the high refractive index layer 7, and the number of layers was 5. Total film thickness is 1
μm. After forming the functional layer 5 on the base material 2, the adhesive layer 6 is formed.
Was provided as a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 26 A polyester film having a thickness of 12 μm was used for the base material 2, and a thermoplastic acrylic resin containing oil silicone was used for the release layer 3. In the functional layer 5, cerium fluoride was used as the low refractive index layer 8 and cerium dioxide was used as the high refractive index layer 7, and the number of layers was 5. The total film thickness was 1 μm. After forming the functional layer 5 on the substrate 2, a patterned adhesive layer 6 was provided to form a transfer foil. The structure and layer state of the forgery-preventing transfer foil of this example,
The evaluation results are shown in Table 1. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 27 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3 and patterned by gravure printing. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and cerium dioxide was used as the high refractive index layer 7, and the number of layers was 5. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 28 A polyester film having a thickness of 12 μm was used for the base material 2, and a thermoplastic acrylic resin containing oil silicone was used for the release layer 3. In the functional layer 5, magnesium fluoride was used as the low refractive index layer 8 and cerium dioxide was used as the high refractive index layer 7, and the number of layers was 5. The total film thickness was 1 μm. Functional layer 5 on substrate 2
After the formation, a patterned adhesive layer 6 was provided to obtain a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 29 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3, and repatterning was performed by gravure printing. In the functional layer 5, silicon dioxide was used as the low refractive index layer 8 and tantalum oxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the base material 2, an adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. Visible light
When incident at an angle of 45 degrees, the central wavelength shifted to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Example 30 A polyester film having a thickness of 12 μm was used as the base material 2, and a thermoplastic acrylic resin containing oil silicon was used as the release layer 3. In the functional layer 5, silicon dioxide was used as the low refractive index layer 8 and tantalum oxide was used as the high refractive index layer 7, and the number of layers was five. The total film thickness was 1 μm. After forming the functional layer 5 on the substrate 2, a patterned adhesive layer 6 was provided to form a transfer foil. Table 1 shows the structure of the anti-counterfeiting transfer foil, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. The transferability of the anti-counterfeit transfer foil was good.

Comparative Example 1 A 12 μm-thick polyester film was used as the substrate, and a thermoplastic acrylic resin containing oil silicone was used as the release layer. In the functional layer, magnesium fluoride was used as the low refractive index layer and titanium dioxide was used as the high refractive index layer, and the number of layers was three. The total film thickness was 1 μm or less. After forming the functional layer on the substrate, an adhesive layer was provided to form a transfer foil.

Table 2 shows the constitution, layer states and evaluation results of the forgery-preventing transfer foil of this comparative example. The visible spectrum of this anti-counterfeit transfer foil is shown in FIG. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light was incident at an angle of 45 degrees, the center wavelength shifted to the lower wavelength side, but the color change was not clear. The adhesion of the functional layer to the transferred substrate was good.

Comparative Example 2 A 12 μm-thick polyester film was used as the base material, and an acrylic resin added with oil silicon was used as the release layer. In the functional layer, magnesium fluoride was used as the low refractive index layer and titanium dioxide was used as the high refractive index layer, and the number of layers was seven. The total film thickness was 1 μm. After forming the functional layer on the substrate, an adhesive layer was provided to form a transfer foil. Table 2 shows the structure of the forgery-preventing transfer foil of this comparative example, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light is incident at an angle of 45 degrees, the central wavelength shifts to the lower wavelength side, causing a color change. However, because of the large number of layers, the adhesion of the functional layer to the transferred substrate was poor, and cracks were generated in the functional layer during transfer and bending.

Comparative Example 3 A 12 μm-thick polyester film was used as the base material, and an acrylic resin added with oil silicon was used as the release layer. Aluminum fluoride was used as the low refractive index layer and cerium dioxide was used as the high refractive index layer in the functional layer, and the number of layers was three. The total film thickness was 1 μm. After forming the functional layer on the substrate, an adhesive layer was provided to form a transfer foil. Table 2 shows the structure of the forgery-preventing transfer foil of this comparative example, the state of the layers, and the evaluation results. The center wavelength of absorption of visible light perpendicular to the film was 550 nm. When visible light was incident at an angle of 45 degrees, the center wavelength shifted to the lower wavelength side, but the color change was not clear. The adhesion of the functional layer to the transferred substrate was good.

[0079]

[Table 1]

[0080]

The transfer foil for forgery prevention of the present invention comprises a release layer, a protective layer, a functional layer, and an adhesive layer, which are sequentially provided on a base material, and the functional layer is made of a plurality of ceramic materials having different refractive indexes with a specific thickness. It has the property of reflecting or transmitting light rays in a specific wavelength range by stacking the layers on top of it, and the optical path length in the thin film changes due to the change in the film thickness of the functional layer depending on the viewing angle. The color of the light changes. As a result, the colors look different, which makes it easy to discriminate and exhibits anti-counterfeiting properties.

By forming a colored layer as the lower layer,
The transfer foil can be colored without being adversely affected by the change in color of transmitted light or reflected light and the transfer of the functional layer to the transfer target substrate, and it is easier to see and the color type can be selected.

Further, the peeling layer or the adhesive layer has a specific pattern.
A specific pattern having the characteristics of the functional layer can be formed by forming a mark, a character, or the like in a pattern.

In addition, by using a transfer foil, the transfer onto a three-dimensional object such as a molded product is facilitated, and an excellent effect that the conventional transfer foil for forgery prevention is very high, which is extremely effective in preventing forgery, is exhibited.

[0084]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a transfer foil for forgery prevention of the present invention.

FIG. 2 is a sectional view showing the structure of a forgery-preventing transfer foil according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a structure and a transfer state of a forgery-preventing transfer foil according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a structure and a transfer state of a forgery prevention transfer foil according to another embodiment of the present invention.

FIG. 5 is an explanatory diagram illustrating a transfer state by the forgery prevention transfer foil of the embodiment in FIGS. 3 and 4;

FIG. 6 is a graph showing a visible spectrum of a functional layer of the transfer foil for forgery prevention of the present invention in Example 1.

FIG. 7 is a graph showing a visible spectrum of a functional layer of the forgery-preventing transfer foil of the present invention in Example 10.

FIG. 8 is a graph showing a visible spectrum of a transfer foil as Comparative Example 1 with respect to the transfer foil for forgery prevention of the present invention.

[Explanation of symbols]

1, 11, 12, 13 ... Transfer foil for manufacturing prevention 2 ... Base material 3
... Release layer 4 ... Protective layer 5 ... Functional layer 6 ... Adhesive layer 7 ... Low refractive index layer 8 ... High refractive index layer 9 ... Colored layer 10 ... Anti-counterfeit pattern 14 ... Transferred substrate

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Fuminobu Noguchi 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Satoshi Kitamura 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (56) Reference JP 61-292181 (JP, A) JP 64-40878 (JP, A) JP 7-191604 (JP, A) JP 7-191595 (JP , A) JP 7-199812 (JP, A) JP 7-210085 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B44C 1/165-1/17 B41M 3/12-3/14

Claims (8)

(57) [Claims] 1. A release layer on the substrate, the functional layer are sequentially provided it with an adhesive layer, and the functional layer is Ri name by laminating a plurality of ceramic materials having different refractive index, and the functional layer is viewing angle To
A transfer foil for anti-counterfeiting that is characterized by different colors . 2. The forgery-preventing transfer foil according to claim 1, wherein the functional layer comprises a combination of a high refractive index layer and a low refractive index layer. 3. The functional layer is a laminated body of ceramic materials having different refractive indexes, and a combination of high refractive index layers and low refractive index layers is alternately arranged. 2. A transfer foil for forgery prevention according to 2. 4. The functional layer comprises magnesium fluoride, calcium fluoride, cerium fluoride, aluminum fluoride,
Any one of silicon dioxide, aluminum oxide, magnesium oxide , zinc sulfide, zirconium dioxide, dioxide
Titanium, cerium dioxide, magnesium oxide, suboxide
Lead claims 1-3 noise, which is a laminate consisting of a combination of any one of indium oxide
The anti-counterfeit transfer foil described therein. 5. The functional layer comprises ceramics having different refractive indexes.
It is a laminated body of materials and a colored layer is provided on the surface of the adhesive layer side.
False according to any one of claims 1 to 4, characterized in that
Transfer foil for manufacturing prevention. 6. A protective layer is provided between the release layer and the functional layer.
The character according to any one of claims 1 to 5, wherein
Anti-counterfeit transfer foil. 7. The release layer is formed in a pattern.
Anti-counterfeiting according to any one of claims 1 to 6,
Transfer foil for stop. 8. The adhesive layer is formed in a pattern.
Anti-counterfeiting according to any one of claims 1 to 6,
Transfer foil for stop.