WO2020067087A1 - Multilayered structure, authenticity determination method, authenticity determination system, and program - Google Patents

Abstract

The purpose of the present invention is to provide a multilayered structure with an improved forgery resistant property, an authenticity determination method and an authenticity determination system thereof, and a program that can be integrated into the system. Provided is a multilayered structure comprising a resin layer (A) containing a first luminescent material, and a resin layer (B) containing laser light energy absorber, the multilayered structure satisfying at least one of (1) and (2): (1) the resin layer (B) contains a second luminescent material different from the first luminescent material; and (2) the multilayered structure further includes a resin layer (C), the resin layer (C) being located opposite side to the resin layer (A) across the resin layer (B) and containing the second luminescent material different from the first luminescent material.

Description

Multilayer body, authentication method, authentication system and program

The present invention relates to a multilayer body, an authentication method, an authentication system and a program.

樹脂 Conventionally, resin films have been used in ID cards, e-passports, IC cards, and the like. As such a resin film, there is known a laser marking film capable of printing a specific area by irradiating a laser beam (see Patent Document 1).

WO2010 / 089035

By the way, in various personal authentication cards, personal information may be printed. In such cards, there is a problem that the prints are easily shaved and forged. In the laser marking film exemplified in Patent Document 1, the inner layer of the laminated film can be printed or drawn by laser engraving. Therefore, it is improved from the viewpoint of preventing forgery as compared with the conventional one in which printing or drawing is performed on the surface. However, since the information can be visually confirmed, there is a problem that the effect of preventing forgery is limited. Further, there is a problem that the content can be falsified by additionally performing laser marking.
Therefore, an object of the present invention is to provide a multilayer body having improved anti-counterfeiting properties, an authentication method thereof, an authentication system, and a program that can be incorporated in the system.

The above problem has been solved by the following means.
<1> It has a resin layer (A) containing a first luminous body and a resin layer (B) containing a laser beam energy absorber, and further satisfies at least one of the following (1) and (2) , Multilayer body;
(1) the resin layer (B) contains a second illuminant different from the first illuminant;
(2) further comprising a resin layer (C), the resin layer (C) being located on the opposite side of the resin layer (B) from the resin layer (A), and Contains a different second illuminant.
<2> The multilayer body according to <1>, which satisfies the above (1).
<3> The multilayer body according to <1> or <2>, which satisfies the above (2).
<4> The method according to any one of <1> to <3>, wherein the second luminous body is at least one selected from luminous bodies excited by at least one of ultraviolet light and infrared light. Multilayer body.
<5> The first light emitter and the second light emitter are at least one selected from light emitters excited by light supplied from the same light source, any of <1> to <4>. A multilayer body according to any one of the preceding claims.
<6> The first light-emitting body according to any one of <1> to <5>, wherein the first light-emitting body is at least one selected from a light-emitting body that is excited by at least one of ultraviolet light and infrared light. Multilayer body.
<7> The multilayer body according to any one of <1> to <6>, wherein the resin layer (A) contains at least one of a polycarbonate resin and a polyester resin.
<8> The method according to any one of <1> to <7>, wherein at least one of the resin layer (B) and the resin layer (C) contains at least one of a polycarbonate resin and an amorphous polyester resin. Multi-layer body.
<9> The first luminous body is composed of B, F, Mg, Al, Si, P, S, Cl, Ca, V, Mn, Cu, Zn, Ge, Sr, Y, Ba, La, Ce, Pr. , Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the element according to any one of <1> to <8>, Multi-layer body.
<10> The second luminous body is composed of B, F, Mg, Al, Si, P, S, Cl, Ca, V, Mn, Cu, Zn, Ge, Sr, Y, Ba, La, Ce, Pr. , Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the element according to any one of <1> to <9>, Multi-layer body.
<11> The multilayer body according to any one of <1> to <10>, which is used for determining authenticity.
<12> The multilayer body according to any one of <1> to <11>, which is a security card.
<13> The multilayer body according to any one of <1> to <12>, wherein a laser marking process is performed on the resin layer (B).
<14> The multilayer body according to any one of <1> to <13>, further having a light shielding layer.
<15> The multilayer body according to <14>, wherein the light shielding layer contains a white pigment or a black pigment.
<16> After performing the laser marking process on the resin layer (B) of the multilayer body according to any one of <1> to <15>, the first luminous body and the second luminous body emit light, respectively. A method for determining the authenticity of a multilayer body, comprising irradiating a specific light capable of performing the method.
<17> The authenticity determination method according to <16>, wherein the wavelength of the specific light is in a range of 200 to 450 nm.
<18> The authenticity determination method according to <16>, wherein the wavelength of the specific light is in a range of 800 to 10,000 nm.
<19> The authentication method according to any one of <16> to <18>, wherein the multilayer body is a security card.
<20> The multilayer body according to any one of <1> to <15>, wherein the multilayer body after laser marking processing is irradiated with specific light to emit light from the multilayer body. Irradiation unit, the light emitted by the multilayer body after the laser marking process is performed, if the light emitted by the multilayer body after the pre-registered laser marking process matches, the multilayer body, An authenticity determination system comprising: an authenticity determination unit that determines that the light emitted by the device is authentic light.
<21> The light emitted from the multilayer body after the pre-registered laser marking processing is performed is light emitted from the laser marking non-processing portion and light emitted from the laser marking processing portion having a specific optical density. The authenticity determination system according to <20>, comprising:
<22> A program described in a computer-readable format, the method comprising: detecting light emitted by the multilayer body according to any one of <1> to <15>; The light emitted from the multilayer body after the pre-registered laser marking processing is performed, and the light emitted from the multilayer body is an authenticity determining step of determining that the emitted light is genuine light. A program that causes a computer to execute the processing that includes it.

According to the present invention, it is possible to provide a multilayer body having improved anti-counterfeiting properties, an authentication method thereof, an authentication system, and a program that can be incorporated in the system.

It is a sectional view showing typically an example of a multilayer object concerning a preferred embodiment of the present invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically another example of the multilayer body which concerns on preferable embodiment of this invention. It is sectional drawing which shows typically an example of the multilayer body of the comparative example of this invention. It is sectional drawing which shows another example of the multilayer body of the comparative example of this invention typically. It is sectional drawing which shows another example of the multilayer body of the comparative example of this invention typically. It is sectional drawing which shows another example of the multilayer body of the comparative example of this invention typically. It is sectional drawing which shows another example of the multilayer body of the comparative example of this invention typically. It is sectional drawing which shows another example of the multilayer body of the comparative example of this invention typically. It is sectional drawing which shows another example of the multilayer body of the comparative example of this invention typically. It is a flowchart which shows an example of the authentication judgment method using the multilayer body which concerns on the preferable embodiment of this invention. 17 is a part of a flowchart showing a modification of the authentication method shown in FIG. 16. 1 is an apparatus configuration diagram illustrating an example of an authentication determination system according to a preferred embodiment of the present invention.

Hereinafter, the present invention will be described in detail. Note that the present invention is not limited to the following embodiments, and can be arbitrarily modified and implemented within the scope of the effects of the invention.

The multilayer body of the present invention has a resin layer (A) containing a first luminous body and a resin layer (B) containing a laser beam energy absorber, and further comprises the following (1) and (2) Meet at least one.
(1) The resin layer (B) contains a second luminous body different from the first luminous body.
(2) further comprising a resin layer (C), the resin layer (C) being located on the opposite side of the resin layer (B) from the resin layer (A), and Contains a different second illuminant.

FIG. 1 is a cross-sectional view schematically illustrating an example of a multilayer body according to a preferred embodiment of the present invention.
The multilayer body of this embodiment includes a violet light-emitting film 1 that emits purple light in response to a first light (light 1), and a yellow-green LM that emits yellow-green in response to the first light (light 1). And a film 23. The purple light emitting film 1 contains a purple light emitter (first light emitter) that emits purple light in response to the first light. The yellow-green LM film 23 absorbs laser light and emits yellow-green light in response to the first light and emits yellow-green light, and discolors the matrix resin to black by its energy. It contains a laser light energy absorber (for example, a laser marking agent is exemplified). In the present embodiment, before the laser light energy absorber is irradiated with the first light (light beam 1) before being irradiated with the laser light (before the laser marking process), the purple light emitter and the yellow-green light emitter are irradiated with the first light (light beam 1). Both glow and appear white. On the other hand, even if the second light (light ray 2) is irradiated, the violet light emitter and the yellow-green light emitter do not emit light, and the color of the thermoplastic resin can be seen as it is. If the thermoplastic resin is, for example, a polycarbonate resin or an amorphous polyester resin, it looks so-called transparent. In this specification, “transparent” means that the value of the total light transmittance specified by ISO13468-1: 1996 indicates 50% or more. In the case where other components are added to the thermoplastic resin without departing from the spirit of the present invention, the color of the thermoplastic resin including such additives will be confirmed.
On the other hand, after being irradiated with the laser light (after the laser marking process), the portion of the yellow-green LM film 23 that has been irradiated with the laser light usually turns black. Therefore, when the first light (light beam 1) is irradiated, the laser marking processing section causes the violet luminous body to emit light on the black region, and shows a slightly dark purple. On the other hand, the laser marking non-processed portion remains white.
On the other hand, when the second light (light beam 2) is applied, the violet light-emitting film 1 and the yellow-green LM film 23 do not emit light in the laser-marking non-processed portion, so that the color of the thermoplastic resin as it is can be confirmed. . On the other hand, the laser marking processing section normally looks black when irradiated with laser light.
Unless otherwise stated, it is assumed that all cross-sectional views of the multilayer body are visually observed or detected from above the drawings (the same applies to the following drawings).

According to the multilayer body of the present embodiment, the color detected by the emission of the first light (light 1) differs before and after the laser marking process. Therefore, by performing the laser marking process, an irreversible change can be given to the emission color of the multilayer body, which can be used for authenticity determination. Further, by further laminating the multilayer body of the present embodiment on the already written true information portion, it is possible to distinguish from the already written true information portion for additional counterfeit laser marking processing. As a result, an additional counterfeit laser marking process can be prevented.
The method of determining the authenticity utilizing such properties will be described later, but a typical advantage is that the laser-marked portion is predetermined because the color of the light emitted from the multilayer body is different. Irradiation with light of a wavelength changes the color of the multilayer body. Using this, for example, as will be described later, there is an embodiment in which information on the emission color (light) after the laser marking process is recorded in advance. In this way, when it is necessary to confirm the card (example of a multilayer body), the card is subjected to laser marking processing, and the luminescent color (light) at that time is compared with the recorded luminescent color (light) so that the card can be checked. Can be checked in a simple and non-destructive manner as to whether or not it is forged.

FIG. 2 is a cross-sectional view schematically showing another example of the multilayer body according to the preferred embodiment of the present invention.
The multilayer body shown in FIG. 2A emits yellow-green LM film 23 that emits yellow-green in response to the first light (light 1) and emits purple in response to the first light (light 1). And a violet light-emitting film 1. The yellow-green LM film 23 and the purple light-emitting film 1 are the same as in the embodiment of FIG. In the multilayer body shown in FIG. 2A, before the laser light energy absorber is irradiated with the first light (light beam 1) before being irradiated with the laser light (before the laser marking process), a yellow-green luminescent material is obtained. And the violet illuminant both emit light and appear white. On the other hand, even when the second light (light ray 2) is irradiated, the yellow-green light emitter and the purple light emitter do not emit light, and the color of the thermoplastic resin can be seen as it is.
In the embodiment shown in FIG. 2, after the laser marking process, a part of the yellow-green LM film 23 turns black in the thickness direction. Therefore, when the first light (light beam 1) is irradiated, the laser marking processing unit emits the yellow-green illuminant on the black region 30, and exhibits a slightly dark yellow-green. On the other hand, the laser marking non-processed portion remains white.

FIG. 3 is a cross-sectional view schematically showing another example of the multilayer body according to the preferred embodiment of the present invention.
The multilayer body of this embodiment includes a violet light-emitting film 1 that emits purple light in response to a first light (light beam 1), a laser marking film 3 including a laser light energy absorber, And a yellow-green light-emitting film 2 that emits yellow-green light in this order. The embodiment of the violet light-emitting film 1 is the same as that of FIG. The laser marking film 3 contains a laser light energy absorber, and the laser marking portion usually turns black. The yellow-green luminescent film 2 contains a yellow-green luminescent material that emits yellow-green in response to the first light, and emits yellow-green when irradiated with the first light.
Before the laser marking process, the multilayer body of this embodiment emits purple light from the purple light-emitting film 1 and yellow-green light from the yellow-green light-emitting film 2 due to the irradiation of the first light, and looks white. On the other hand, after the laser marking process, since the laser marking film 3 is usually discolored to black, when the first light is irradiated, the yellow-green luminescence intensity from the yellow-green luminescent film 2 therebelow is irradiated. Becomes weaker. As a result, the purple emission contribution of the purple emission film over the black laser marking film is enhanced. That is, in the same manner as in the embodiment of FIG. 1, irradiation of the first light causes the treated multilayer body to exhibit a slightly dark purple color.
On the other hand, when the violet light emitter and the yellow-green light emitter emit light that does not emit light (second light), as in FIG. The processing section normally appears black when irradiated with the laser beam.

FIG. 4 is a cross-sectional view schematically showing another example of the multilayer body according to the preferred embodiment of the present invention.
The multilayer body of this embodiment has a light emitting film 11, a laser marking film 3, and a light emitting film 21 in that order. The light-emitting film 11 responds to the first light (light 1) and the first light (light 1) and the second light (light 2) which emits yellow-green light in response to the first light (light 1). And a red light emitter (light beam 2) that emits red light. The light-emitting film 21 responds to the first light (light 1), a violet luminous body (light 1) that emits purple light, and a first light (light 1) and a second light (light 2). And a luminous body in which blue and green light are emitted. With the laser marking film in between, the upper and lower layers combine light emitters that emit different colors in response to different light.
Before the laser marking process, the multilayer body of this embodiment causes the film 11 to emit orange light, the film 21 to emit blue light, and appear white when irradiated with the first light. On the other hand, after the laser marking process, since the laser marking film 3 is normally discolored to black, even if the first light is irradiated, the blue light emission intensity of the film 21 thereunder becomes weak. As a result, orange emission on the black laser marking film is strongly detected. That is, the irradiated multilayer body exhibits a slightly dark orange color by the first light irradiation.
On the other hand, by the irradiation of the second light, the film 11 emits red light, the film 21 emits blue-green light, and the multilayer body appears white before the laser marking process. On the other hand, after the laser marking process, since the laser marking film 3 has changed color to black, even if the second light is irradiated, the blue-green light emission intensity from the film 21 thereunder becomes weak. As a result, the red emission on the black laser marking film is strongly detected. That is, by the irradiation of the second light, the treated multilayer body exhibits a slightly dark red color.

FIG. 5 is a cross-sectional view schematically showing another example of the multilayer body according to the preferred embodiment of the present invention.
The multilayer body of the present embodiment shown in FIG. 5 has a red light emitting film 6, a laser marking film 3, a blue light emitting film 7, a laser marking film 3 ', and a green light emitting film 8 in that order. I have. The laser marking film 3 is the same as that shown in FIG. In the laser marking film 3 ′, the concentration of the laser beam energy absorber is higher than the concentration of the laser beam energy absorber contained in the laser marking film 3. The red light emitting film 6, the blue light emitting film 7, and the green light emitting film 8 emit red light, blue light, and green light, respectively, when irradiated with the first light (light 1) and the second light (light 2), respectively. It is a film containing the body. Before the laser marking process, the multilayer body of the present embodiment emits red light from the red light emitting film 6, emits blue light from the blue light emitting film 7, and emits green light from the green light emitting film 8 by the first light irradiation. It emits light and looks white.
On the other hand, in the first laser marking process, the concentration of the laser light energy absorber contained in the laser marking film 3 ′ is made higher than the concentration of the laser light energy absorber The marking film 3 'is selectively marked. In this case, since the laser marking film 3 ′ is normally discolored to black, even if the first light is irradiated, the light emission of the green light-emitting film 8 thereunder is weak. Red light emission and blue light emission on the film are strongly detected. That is, the irradiated multilayer body exhibits a slightly dark purple color by the irradiation of the first light.
Further, in the second laser marking process, laser marking is performed on both the laser marking film 3 ′ and the laser marking film 3. In this case, since the laser marking film 3 is usually discolored to black, even if the second light is irradiated, the blue light-emitting film 7 and the green light-emitting film 8 thereunder weakly emit light. The red emission on the black laser marking film 3 will be strongly detected. That is, the treated multilayer body exhibits a slightly dark red color by the irradiation of the first light.

On the other hand, by the irradiation of the second light, in the multilayer body before the laser marking treatment, all the films emit light in the same manner as at the time of the irradiation of the first light, and the same result is obtained. Even by the irradiation of the second light, light is emitted in the same manner as when the first light is irradiated, and the treated multilayer body exhibits a slightly dark red color.

FIG. 6 is a cross-sectional view schematically showing another example of the multilayer body according to the preferred embodiment of the present invention.
The multilayer body of the present embodiment shown in FIG. 6 has a red light emitting film 6, a laser marking film 3, and a blue green light emitting film 9 in that order. The red light emitting film 6 is the same as that shown in FIG. The laser marking film 3 is the same as that shown in FIG. The blue-green light-emitting film 9 is a luminous body that mixes blue and green and emits blue-green in response to the first light and the second light. Before the laser marking process, the multilayer body shown in FIG. 6 emits red light from the red light-emitting film 6, emits blue light from the blue-green light-emitting film 9, and emits white light from the multilayer body when irradiated with the first light. Looks like. On the other hand, after the laser marking process, since the laser marking film 3 is normally discolored to black, even if the first light is irradiated, the light emission of the blue-green light-emitting film 9 thereunder is weakened. As a result, the red emission on the black laser marking film is strongly detected, giving a slightly darker red color.
On the other hand, by the irradiation of the second light, in the multilayer body before the laser marking treatment, all the films emit light in the same manner as when the first light is irradiated, and the same result is obtained. Even by the irradiation of the second light, light is emitted in the same manner as when the first light is irradiated, and the treated multilayer body exhibits a slightly dark red color.
In the embodiment of FIG. 6, by adjusting the laser marking conditions, the black optical density (OD value) of the laser marking portion may be adjusted to a predetermined value. According to this aspect, the authenticity can be determined only by the first light. Specifically, before the laser marking process, the first light irradiates the red light-emitting film 6 to emit red light, the blue-green light-emitting film 9 emits blue-green light, and the multilayer body looks white. On the other hand, after the laser marking process, by adjusting the laser marking portion so as to have a certain OD value, even if the first light is irradiated, the light emitted from the blue-green light-emitting film 9 therebelow. Is attenuated at a constant rate. As a result, mixed light of red emission on the black laser marking film and slightly weak blue-green light will be detected. By pre-registering the red and blue-green lights at this time, the authenticity can be determined without irradiating the second light. In the embodiment of FIG. 6, when the black OD value of the laser marking processing unit is low, light red emission is shown, and as the OD value increases, the visibility of red emission increases.
Regarding the adjustment of the optical density, the embodiment of FIG. 6 has been described as an example, but it is needless to say that the same configuration can be applied to the multilayer body of other embodiments.

FIG. 7 shows an embodiment in which a light shielding layer 31 is provided on the opposite side of the multilayer violet light emitting film 1 shown in FIG. By irradiating the first light and the second light from the direction of the arrow in FIG. 7, the authenticity can be determined. By providing the light shielding layer, the contribution of light from the side opposite to the viewing direction is eliminated, and the visual recognition of the discoloration effect of the laser marking processing unit becomes easier. Further, by laminating the multilayer body of the present invention with a printing surface of an adherend, it is possible to use the multilayer body as a print protection film having an authenticity judgment function. Here, the light shielding layer is not particularly limited as long as it is a layer that shields light, but usually includes a resin film mixed with a white pigment or a black pigment. In addition, a chromatic pigment may be used as long as light emission used in the present invention can be confirmed.

FIG. 8 shows a state in which a multilayer body corresponding to FIG. 3 is further provided on the surface of the light shielding layer 31 on the surface opposite to the multilayer body shown in FIG. 1 in the multilayer body shown in FIG. is there. By adopting such an embodiment, two pieces of optical information, that is, the optical information after the laser marking processing by the multilayer body shown in FIG. 1 and the optical information after the laser marking processing by the multilayer body shown in FIG. 3 are combined into one multilayer body. Can be included. As a result, a higher performance authentication film can be obtained.

In the above embodiments, the system displays the processing information after the laser marking process on the entire surface of the multilayer body. However, depending on the use of the multilayer body, only a part of the area in the surface direction of the multilayer body is used. May be provided.
Further, a preferred embodiment of the present invention includes an embodiment in which the multilayer body shown in FIG. 1 is incorporated in a partial region in the plane direction of the multilayer body and the multilayer body shown in FIG. 3 is incorporated in another part.

FIG. 9 is a cross-sectional view schematically illustrating a multilayer body of a comparative example. The multilayer body of the comparative example shown in FIG. 9 has a blank film (resin film not containing a light-emitting body) 4 and a yellow-green LM film 23 in that order. The yellow-green light-emitting film 23 is the same as the example in FIG. In the multilayer body of this comparative example, the yellow-green light-emitting film 23 emits yellow-green light by irradiating the first light before the laser marking process. After the laser marking process, it usually looks black due to the irradiation of the laser beam.
On the other hand, when the yellow-green light emitter emits light (second light) that does not emit light, the yellow-green light emitter does not emit light before the laser marking process. After the laser marking process, it usually looks black.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

FIG. 10 is a sectional view schematically showing a multilayer body of another comparative example. The multilayer body of the comparative example shown in FIG. 10 has a violet light emitting film 1 and a laser marking film 3 in that order. The purple light emitting film 1 is the same as the example of FIG. In the multilayer body of this comparative example, when the first light is not irradiated, the violet light-emitting body does not emit light, and the color of the thermoplastic resin can be seen as it is. By irradiating this with the first light, the purple light-emitting film 1 emits purple light, and the multilayer body exhibits purple color.
On the other hand, after the laser marking process, the laser marking film 3 turns black. Thereafter, when the first light is applied, the purple light-emitting film 1 emits purple light, and the multilayer body looks slightly dark purple.
On the other hand, when the second light (light beam 2) is irradiated, since the violet light-emitting film 1 does not emit light in the laser marking processing section, the same color (normally transparent) of the thermoplastic resin can be confirmed. On the other hand, the non-laser-marked portion usually looks black.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

FIG. 11 is a sectional view schematically showing a multilayer body of another comparative example. The multilayer body of the comparative example shown in FIG. 11 has a blank film 4 (a resin film containing no luminous body), a laser marking film 3, and a yellow-green luminescent film 2 in that order. The yellow-green light emitting film 2 is the same as the example of FIG. In the multilayer body of the comparative example shown in FIG. 11, when the first light is not irradiated, the color of the thermoplastic resin as it is can be confirmed. On the other hand, by irradiating the first light, the yellow-green light-emitting film 2 emits yellow-green light. After the laser marking process, the laser marking film 3 turns black. After that, even if the first light is applied, the yellow-green light emission intensity of the yellow-green light-emitting film 2 becomes weak and remains black.
On the other hand, when the second light (light beam 2) is irradiated, the laser marking processing section does not emit light from the yellow-green light emitting film 2, so that the color of the thermoplastic resin as it is (usually transparent) can be confirmed. On the other hand, the non-laser-marked portion usually looks black.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

FIG. 12 is a sectional view schematically showing a multilayer body of another comparative example. The multilayer body of the comparative example shown in FIG. 12 has a violet light emitting film 1, a blank film 4, and a yellow-green light emitting film 2 in that order. The violet light-emitting film 1 and the yellow-green light-emitting film 2 are the same as in the example of FIG. In the multilayer body of the comparative example shown in FIG. 12, when the first light is not irradiated, the same color (normally transparent) of the thermoplastic resin can be confirmed. By irradiating this with the first light, the purple light-emitting film 1 emits purple light, the yellow-green light-emitting film 2 emits yellow-green light, and the multilayer body exhibits white. Further, even after the laser marking processing, there is no discoloration due to the laser marking processing, and there is no change.
On the other hand, the untreated multilayer body and the treated multilayer body do not respond to the second light, and the same color (usually transparent) of the thermoplastic resin can be confirmed.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

FIG. 13 is a sectional view schematically showing a multilayer body 5C of another comparative example. The multilayer body of the comparative example has a violet light-emitting film 1, a laser marking film 3, and a blank film 4 in that order. The purple light emitting film 1 is the same as the example of FIG. In the multilayer body of the comparative example shown in FIG. 13, the color of the thermoplastic resin can be confirmed as it is when the first light is not irradiated. By irradiating this with the first light, the purple light-emitting film 1 emits purple light, and the multilayer body exhibits purple color. When this is subjected to a laser marking process, the laser marking film 3 turns black. Thereafter, when the first light is applied, the purple light emitting film 1 emits purple light, and the multilayer body becomes slightly dark purple.
On the other hand, it does not respond to the second light, and the untreated multilayer body can confirm the color of the thermoplastic resin (usually transparent), and the treated multilayer body becomes black.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

FIG. 14 is a sectional view schematically showing a multilayer body of another comparative example.
The multilayer body of the comparative example shown in FIG. 14 includes a yellow-green light-emitting film 2 that emits yellow-green light in response to a first light (light beam 1), a laser marking film 3 including a laser light energy absorber, and an orange. And an orange dye film 5 colored with this dye in this order. The embodiment of the yellow-green light-emitting film 2 is the same as that of FIG. The laser marking film 3 is the same as the embodiment of FIG. The orange dye film 5 has no responsiveness to ultraviolet light, and shows absorption of orange light in the visible light region.
In the multilayer body of the present embodiment, before the laser marking treatment, the yellow-green light-emitting film 2 emits light by the first light irradiation, and yellow-green light is observed. It looks yellow-green because it is weak. On the other hand, after the laser marking process, since the laser marking film 3 is usually discolored to black, even if the first light is irradiated, the orange coloring effect of the orange dye film 5 thereunder can be obtained. I can't. As a result, only the yellow-green emission of the yellow-green emitting film over the black laser marking film is detected. That is, similarly to the embodiment of FIG. 1, the irradiated multilayer body exhibits a slightly dark yellow-green color by the irradiation of the first light.
On the other hand, when irradiated with the second light, the laser marking non-processed portion presents the same color of the thermoplastic resin (orange in this example), and when irradiated with the second light, the laser marking processed portion is usually Looks black. Therefore, even if the additional laser marking processing is performed, the authenticity cannot be determined.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

FIG. 15 is a sectional view schematically showing a multilayer body of another comparative example.
The multilayer body of the comparative example shown in FIG. 15 has an orange dye film 5 colored with an orange dye, a laser marking film 3 including a laser light energy absorber, and yellow in response to the first light (light 1). And a yellow-green light-emitting film 2 that emits green light. The orange dye film 5 is the same as in FIG. The laser marking film 3 is the same as the embodiment of FIG. The embodiment of the yellow-green light-emitting film 2 is the same as that of FIG.
In the multilayer body of the present embodiment, before the laser marking treatment, yellow-green light emission of the yellow-green light-emitting film 2 due to irradiation of the first light is confirmed, but the coloring effect of the orange dye film 5 thereunder is weak. Therefore, it looks yellow-green. At this time, the orange dye film 5 is translucent, and the yellow-green emission of the yellow-green light-emitting film 2 thereunder can be visually recognized or detected via the orange dye film 5. After the laser marking process, since the laser marking film 3 is usually discolored to black, even if the first light is irradiated, the yellow-green light-emitting film 2 thereunder does not emit light, and only black is emitted. appear. On the other hand, when the yellow-green light-emitting body and the orange dye are irradiated with light (second light) that does not emit light, the laser-marked non-processed portion shows the same color of the thermoplastic resin (orange in this example), The part usually looks black. That is, even if the laser marking processing unit irradiates the light beam 1, it irradiates the light beam 2 and looks black.
That is, irradiating the first light and irradiating the second light have the same emission color after the laser marking process.

The multilayer body of the present invention may have a printing layer. The printing layer is also called a design layer. As a method of forming a printing layer, a method of printing a desired design directly on a multilayer body by gravure printing, flexo printing, etc., and forming by heating and drying, and formed by printing on a transfer sheet such as a biaxially stretched PET film. The printed layer is transferred to a multilayer body by a method such as heat transfer.
The printing layer can be printed using, for example, a polyester-based, polycarbonate-based, acrylic-based, or urethane-based printing ink.In particular, when there is a problem with adhesion to the hard coat layer, plasma, ion etching, or corona discharge can be used. It is also possible to improve the adhesion by surface modification such as surface treatment. In addition, a method in which a metal layer, a metal oxide layer, or the like is provided on a thermoformed sheet by using a physical vapor deposition method or a chemical vapor deposition method to form a printed layer is also included. The print layer can be incorporated without departing from the spirit of the present invention. For example, a print layer is provided as in the configuration of resin layer (A) / print layer / resin layer (B), and the print portion is formed of resin (B). , The effect of light emission by the resin layer (A) can be reduced, and a multilayer body in which the influence (light emission) of the resin layer (A) is visually recognized can be produced.
The multilayer body of the present invention is not limited to the above-described one, and the lamination structure of the film can be set by appropriately changing or applying within a range not departing from the gist of the present invention.

<Resin composition>
To the multilayer body of the present invention, a resin or a resin composition commonly used as appropriate within a range in which the effects of the present invention are exhibited can be applied. For the resin layer (A), the resin layer (B), and the resin layer (C), it is preferable to use a resin composition suitable for constituting the layers, and preferably for keeping the shape as a film.

<< Resin >>
The resin contained in the resin composition includes an ultraviolet curable resin, a thermosetting resin, an adhesive resin, an adhesive resin, an ink binder resin, and a thermoplastic resin. Is preferred from the viewpoint of molding processing. Above all, it is preferable to include at least one of a polycarbonate resin and a polyester resin, more preferably at least one of a polycarbonate resin and an amorphous polyester resin, and still more preferably at least one of a polycarbonate resin.

The polycarbonate resin is a-[OR-OCO] -unit (R is an aliphatic group, an aromatic group, or a group containing both an aliphatic group and an aromatic group) containing a carbonate ester bond in the molecular main chain. And the aliphatic group may have a straight-chain structure or a branched structure). In the present invention, it is particularly preferable that each film contains an aromatic polycarbonate resin.
The weight average molecular weight of the polycarbonate resin is preferably from 20,000 to 80,000, more preferably from 21,000 to 50,000, even more preferably from 22,000 to 40,000.
The glass transition temperature of the polycarbonate resin is preferably 120 ° C. or higher, more preferably 130 ° C. or higher. The upper limit is preferably 160 ° C. or lower, more preferably 155 ° C. or lower.

The polyester resin may be an amorphous polyester resin or a crystalline polyester resin.
Examples of the amorphous polyester resin include a PETG resin and a PCTG resin.
The PETG resin is a polyester copolymer composed of a dicarboxylic acid unit mainly composed of terephthalic acid units, an ethylene glycol unit and a glycol unit mainly composed of 1,4-cyclohexanedimethanol units. Account for less than 50% of all glycol units on a molar basis. The terephthalic acid units preferably occupy all dicarboxylic acid units.
PCTG resin is a polyester copolymer composed of a dicarboxylic acid unit mainly composed of terephthalic acid units, an ethylene glycol unit, and a glycol unit mainly composed of 1,4-cyclohexanedimethanol units, and is 1,4-cyclohexanedimethanol. The units account for at least 50% of all glycol units on a molar basis. The terephthalic acid units preferably occupy all dicarboxylic acid units.

Polycaprolactone is an example of the crystalline polyester resin.

In the thermoplastic resin, even if the polycarbonate resin and the polyester resin are combined, even if the polycarbonate resin or the polyester resin is combined with another thermoplastic resin, the polycarbonate resin and the polyester resin are combined with the other thermoplastic resin. Good. In the present invention, the polycarbonate resin or polyester resin (preferably, polycarbonate resin) preferably accounts for 50% by mass or more, more preferably 60% by mass or more, and preferably 80% by mass or more of the entire thermoplastic resin. Is more preferred. The upper limit is not particularly limited, and the polycarbonate resin or the polyester resin may be 100% by mass. One or more polycarbonate resins may be used. As the polyester resin, one type or a plurality of types may be used. In the case where a plurality of materials are used, the total amount is within the above range.

<Light-emitting body>
In the multilayer body of the present invention, the resin layer (A) constituting the multilayer body contains the first luminous body, and the luminous body gives energy (for example, irradiation of ultraviolet light, visible light, or infrared light). It is preferably a luminous body that receives and emits light. Further, in the multilayer body of the present invention, the resin layer (B) or the resin layer (C) can contain the second luminous body. Further, the resin layer (B) and the resin layer (C) may include a third light emitter and a fourth light emitter. In the third and subsequent luminous bodies, one resin layer (A), one resin layer (B), and one resin layer (C) may further include as the second and subsequent luminous bodies, At least one of (A), the resin layer (B) and the resin layer (C) may be two or more layers.
When the multilayer body of the present invention includes both the resin layer (B) and the resin layer (C), the luminous body contained in the resin layer (B) and the luminous body contained in the resin layer (C) are usually different. Types of light emitters.

好 ま し い The preferred compounds employed as the first luminous body and the second luminous body are as described above, but the first luminous body and the second luminous body are different from each other.

The luminous body is a material that emits light upon receiving energy.
The first luminous body and the second luminous body preferably emit light by irradiation with electromagnetic waves, and can emit light by radio waves, microwaves, far infrared rays, infrared rays, ultraviolet light, far ultraviolet light, X-rays, and γ-rays. It is more preferable to emit light by ultraviolet light or infrared light. By emitting light by electromagnetic waves other than visible light as described above, the color state of the multilayer body is not visually recognized, so that information diffusion and easy forgery can be prevented.
Examples of the short-wavelength light include light having a wavelength of 200 to 450 nm, and short-wavelength light having a wavelength of 250 to 420 nm is more preferable.
Examples of the long-wavelength light include light having a wavelength of 800 to 10,000 nm, and light having a wavelength of 900 to 1500 nm is more preferable.
Further, the first light emitter and the second light emitter are preferably light emitters excited by light supplied from the same light source. The first luminous body and the second luminous body may be excited by light of the same wavelength from the same light source, or may be excited by light of a different wavelength from the same light source. Preferably, the difference between the maximum excitation wavelengths of the first luminous body and the second luminous body is within 50 nm, more preferably within 10 nm. The maximum excitation wavelength refers to a wavelength at which the luminous body is excited most.

B, F, Mg, Al, Si, P, S, Cl, Ca, V, Mn, Cu, Zn, Ge, Sr, Y, Ba are each independently used as the first light emitter and the second light emitter. , La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and a compound containing an element selected from the group consisting of Lu. Examples of the compound constituting the light emitting body include a composite oxide of these elements and an oxygen atom, and an organometallic compound combined with an organic group.

As the luminous body, it is preferable to use a luminous body that emits infrared light or ultraviolet light, and it is more preferable to use a luminous body that emits ultraviolet light. Examples of a luminous body that emits light with ultraviolet light include those that are excited by ultraviolet light and have a peak in the emitted spectrum in a wavelength range of blue, green, red, and the like. Specifically, a trace amount of metal (copper, silver, manganese, bismuth, lead, etc.) is added as an activator to enhance the emission of high-purity luminous substances such as zinc sulfide and sulfides of alkaline earth metals. Examples include those obtained by firing at high temperature. For a light-emitting body that emits ultraviolet light, the hue, brightness, and degree of color attenuation can be adjusted by a combination of a host crystal and an activator.

Examples of the compound that can be used as a light-emitting material in the present invention include, for example, paragraphs 0019 and 0090 to 0097 of JP-A-2015-168728, and paragraphs 0033, 0034 and 0069 of JP-A-10-129107. References can be made and these descriptions are incorporated herein.

Each of the first luminous body and the second luminous body preferably contains 0.01% by mass or more in the resin composition, more preferably 0.05% by mass or more, and 0.1% by mass or more. More preferably, it is at least 07% by mass. The upper limit is preferably 5.0% by mass or less, more preferably 2.0% by mass or less, even more preferably 1.0% by mass or less. When the content ratio of the luminous body is equal to or more than the lower limit, the detection with the detector becomes easier. When the content ratio of the luminous body is equal to or less than the upper limit, the luminescent color becomes clearer, which is preferable.
As described above, only one kind of luminous body may be used in one kind of resin composition, or two or more kinds may be used. When two or more kinds are used, the total amount is preferably within the above range.

<Laser energy absorber>
In the multilayer body of the present invention, the resin layer (B) contains a laser beam energy absorber. As the laser light energy absorber, a laser marking agent can be used.
The laser light energy absorber (laser marking agent) can change the color of the thermoplastic resin. Usually, it turns black. From such a viewpoint, the wavelength of the laser beam is preferably 700 nm or more, more preferably 800 nm or more, and further preferably 900 nm or more. The upper limit is practically 1200 nm or less.
The laser light energy absorber preferably has a maximum absorption wavelength at a wavelength different from the maximum excitation wavelength of the luminous body. More specifically, the difference between the maximum excitation wavelength of the luminous body and the maximum absorption wavelength of the laser light energy absorber is preferably 50 nm or more, more preferably 100 nm or more, and more preferably 200 nm or more. Is more preferred. The upper limit of the difference between the maximum excitation wavelength of the luminous body and the maximum absorption wavelength of the laser light energy absorber is not particularly limited, but is usually 1000 nm or less.

The laser light energy absorber includes, for example, at least one selected from the group consisting of carbon black, titanium black, metal oxides, metal sulfides, and metal nitrides. Among them, one or more selected from the group consisting of carbon black, titanium black, and metal oxides are preferred.

Here, when the laser light energy absorber is carbon black, the average particle size is preferably 150 nm or less, more preferably 100 nm or less, and even more preferably 90 nm or less. It is practical that the lower limit is 10 nm or more. The laser light energy absorber is preferably carbon black having a dibutyl phthalate (DBT) oil absorption of 60 to 170 mL / 100 gr. It is preferable that the average particle diameter is equal to or less than the above upper limit because laser colorability can be maintained high. It is preferable that the average particle size is not less than the above lower limit because the coloring of the film can be suppressed. Further, when the DBT oil absorption is equal to or more than the above lower limit, dispersibility can be maintained.

Titanium black and metal oxides having an average particle size of 10 μm or less are preferable because laser colorability and print clarity can be maintained. Examples of the metal forming the oxide include zinc, magnesium, aluminum, iron, titanium, silicon, antimony, tin, copper, manganese, cobalt, bismuth, vanadium, niobium, molybdenum, ruthenium, tungsten, palladium, silver, and platinum. Can be Furthermore, examples of the composite metal oxide include ITO, ATO, and AZO.
Examples of the metal sulfide include zinc sulfide and cadmium sulfide. Further, as the metal nitride, titanium nitride or the like can be given.

The content of the laser beam energy absorber in the resin composition is preferably 0.0005 parts by mass or more, more preferably 0.001 part by mass, based on 100 parts by mass of the resin. More preferably, it is still more preferably 0.005 parts by mass or more. The upper limit is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, even more preferably 1 part by mass or less.
Only one laser light energy absorber may be used, or two or more laser light energy absorbers may be used. When two or more kinds are used, the total amount is preferably within the above range.

In the present invention, it is preferred that the resin layer (B) containing the laser light energy absorber be effectively discolored by irradiating the multilayer body with a laser beam. Examples of the laser light include He-Ne laser (wavelength: 633 nm), Ar laser, CO ₂ laser (wavelength: 9.3 μm to 10.6 μm), gas lasers such as excimer laser (ArF excimer laser (wavelength: 193 nm)), KrF excimer laser (wavelength 248 nm), XeCl excimer laser (wavelength 308 nm), XeF excimer laser (wavelength 351 nm)), YAG laser (wavelength 1064nm), Nd · YVO ₄ laser (wavelength 1065 nm) solid state lasers such as a semiconductor laser, dye laser or the like No. Among these, YAG lasers, Nd · YVO ₄ laser are preferable.

<Other ingredients>
The resin composition constituting the film may contain additives such as an antioxidant, a heat stabilizer, a flame retardant, a flame retardant auxiliary, and a release agent, in addition to the components described above. Alternatively, as long as the effects of the present invention are not impaired, additives such as an ultraviolet light absorber, an antistatic agent, a fluorescent brightener, an antifogging agent, a flow improver, a plasticizer, a dispersant, and an antibacterial agent are contained. Is also good. The content of the additive as described above in the thermoplastic resin is preferably 1.0% by mass or less, more preferably 0.5% by mass or less, based on the mass of the entire thermoplastic resin, More preferably, it is 0.1% by mass or less.

<Film molding>
The method for forming the multilayer body of the present invention is not particularly limited, and a conventional method can be appropriately employed.
For example, a mode is exemplified in which the thermoplastic resin composition constituting each layer of the multilayer body is formed into a film by extrusion or the like, and a film corresponding to each obtained layer is hot-pressed.
Further, the thermoplastic resin composition constituting each layer of the multilayer body can be co-extruded.

<Authentication judgment method>
The multilayer body of the present invention can be suitably used for an authenticity judgment method using the same. The authenticity determination method according to a preferred embodiment of the present invention will be described. After performing a laser marking process on the resin layer (B) of the above-mentioned multilayer body, the resin layer (A) side or from the opposite side, A method including irradiating light capable of causing each of the first light emitter and the second light emitter to emit light may be used. In the present invention, light irradiation is preferably performed from the resin layer (A) side. Here, the light capable of causing the first luminous body and the second luminous body to emit is a wavelength within the maximum excitation wavelength ± 50 nm for the first luminous body and the second luminous body, respectively. It is preferable to irradiate light having a wavelength within a maximum excitation wavelength ± 30 nm, more preferably, to irradiate light having a wavelength within a maximum excitation wavelength ± 10 nm, and a maximum excitation wavelength ± 5 nm. It is more preferable to irradiate light having a wavelength within the range. In the present invention, the light emitted from the multilayer body is detected. The detection here may be mechanically performed by a sensor or the like, but it means that a person visually confirms it. Next, when the light detected above is the genuine light of the multilayer body, that is, as a multilayer body after the laser marking processing, the resin layer (A) and the resin layer (B) It is determined whether or not the light is assumed to be light emission from the resin layer (C). If this corresponds to genuine light, the multilayer body tested for authenticity is determined to be authentic (Yes in FIG. 16), otherwise it is determined to be counterfeit (No in FIG. 16). For the above determination, it is preferable to use a true light emission database (true light emission DB) in which true light emission is recorded and stored (FIG. 17).
In one embodiment of the present invention, the specific light is preferably ultraviolet light, and the wavelength of the light is preferably in a range of 200 to 450 nm.
In another embodiment, the specific light is preferably infrared light, and the wavelength of the light is preferably in the range of 800 to 10,000 nm. In another embodiment, for example, the light-emitting body 1 (manufactured by Nemoto Special Chemical Co., product number D20001, excitation wavelength 825 nm, emission wavelength 965 nm), and the light-emitting body 2 (manufactured by Nemoto Special Chemical Company, product number ASG, excitation wavelength 950 nm, emission wavelength) 670 nm).
The multilayer body applied to the authenticity determination method of the present embodiment is preferably a security card.

<Authentication judgment system>
FIG. 18 is an apparatus configuration diagram showing an example of the authenticity determination system according to the preferred embodiment of the present invention. In the present embodiment, the multilayer body 10 is irradiated with the specific light C1 from the light source 51. The preferable range of the specific light is the same as the above-described authenticity determination method. In the authenticity determination system of the present embodiment, the specific light is applied to the multilayer body after the laser marking processing to cause the multilayer body to emit light, and the light emission C2 is detected by the detection unit 52. The light source (light irradiation unit) 51 and the detection unit 52 are connected to a computer 53 and operated under the control thereof. Next, the computer 53 determines whether the light emitted by the multilayer body is genuine light emitted by the multilayer body after the laser marking process is performed. The procedure for this determination is the same as the flowchart shown in the authenticity determination method (FIGS. 16 and 17). However, in the authenticity determination system of the present embodiment, detection is performed by the detection unit without assuming that detection is performed by human eyes. Although there are various determination methods, a method of determining by comparing a genuine light emission database (DB), which will be described in the embodiment of the program, with the detected light can be used.
Further, the system according to the present embodiment includes an image display unit 54 for displaying the determination result, a printing unit 55 for printing the determination result and its analysis result, and a medium recording unit for recording the determination result on a recording medium. 56 and the like, and the entire system is controlled by a computer. Examples of the recording medium include a magnetic tape, a magnetic disk, an optical disk, and a semiconductor memory.

<Authentication judgment program>
A program described in a computer-readable format according to a preferred embodiment of the present invention is programmed to sequentially advance the procedure shown in the flowchart of FIG. Specifically, the program is a program described in a computer-readable format, wherein the step of detecting the light emitted by the multilayer body of the present invention, and the step of detecting the light emitted by the multilayer body are performed by laser marking registered in advance. A program for causing a computer to execute a process including: an authenticity determining step of determining that the light emitted by the multilayer body is genuine light when the light emitted by the multilayer body after the process is performed matches the light emitted by the multilayer body. It has become. The light emitted from the multilayer body after the pre-registered laser marking processing is performed is a combination of light emitted from the laser marking non-processing part and light emitted from the laser marking processing part, Examples include light emitted by the processing unit and light emitted by the laser marking processing unit having a specific optical density of blackness.
Further, the embodiment will be described with a series of steps based on FIG. 16. When the program is started, a laser marking process of a multilayer body is executed. However, the laser marking process may not be performed in this program, and a multilayer body subjected to a laser marking process may be separately supplied because of the pretreatment of the specimen. In a preferred embodiment of the program, specific light is emitted from, for example, the resin layer (A) side of the multilayer body. The specific light is as defined above, with UV light or infrared light being preferred. Next, light emission from the multilayer body subjected to the laser marking process is detected. The detection at this time may be confirmed visually, and the result may be input and sent to the computer, but is preferably performed by a detection unit connected to the computer. Next, it is determined whether the detected light is the authentic light of the multilayer body. If determined to be authentic (Yes in FIG. 16), the tested multilayer body is determined to be authentic. Otherwise (No in FIG. 16), it is determined to be forgery.

In a preferred embodiment of the program of the present invention, in the authenticity determining step, the detected light from the multilayer body is compared with a genuine luminescence database (genuine luminescence DB) storing a lot of genuine luminescence information, and If the information exists in the database, it is determined to be authentic, and if not, it is determined to be forgery (incorrect). At this time, the genuine light emission database may be recorded and stored as a data structure in the present program, but it is also preferable that the genuine light emission database be stored in a different form from the present program, such as a server or a cloud service platform.

<Application>
The multilayer body of the present invention is suitably used as a security card such as an ID card, an e-passport, and a contactless IC card. However, its use is not limited, and it can be widely used in fields where prevention of forgery is desired, such as product tags, distribution information, personal data management, and security systems.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following embodiments, and can be arbitrarily modified and implemented without departing from the spirit of the present invention.

<Production of film>
Using the resin compositions having the compositions shown in Tables 1 and 2, sheets of test pieces were produced as follows.
Using a T-die melt extruder consisting of a twin screw extruder having a barrel diameter of 32 mm and a screw L / D = 31.5, a 300 mm wide mirror surface sheet was formed at a discharge rate of 20 kg / h and a screw rotation speed of 200 rpm. At a cylinder / die head temperature of 280 ° C., a film having a thickness of 300 μm (0.3 mm) was formed for each resin composition.

<< raw material >>
Polycarbonate resin: Mitsubishi Gas Chemical Company, E-2000F
Purple light emitter: Manufacturer: Nemoto Special Chemical Co., Ltd., product number: V-300M, red light emitter that emits light in response to light beam 1 (light having a wavelength of 365 nm): Manufacturer: Nemoto Special Chemical Co., product number: D1124, light beam 1 (A light having a wavelength of 365 nm) and a yellow-green luminous body that emits light in response to both light 2 (light having a wavelength of 254 nm): Manufacturer: Nemoto Special Chemical Co., Ltd., product number: G-300FF, emits light in response to light 1 Blue light emitter: Manufacturer: Nemoto Special Chemical Co., Ltd., product number: D1184T, green light emitter that emits light in response to both light 1 and light 2: Manufacturer: Nemoto Special Chemical Co., product number: D1164, light 1 and light 2 Orange dye that emits light in response to both: manufacturer: LANXESS, part number: orange 3G
Laser marking agent (LM agent, laser light energy absorber): carbon black, manufacturer: Cabot Japan, part number: MONARCH 800

In the above table, the unit of each component is a mass ratio.

<Evaluation>
Preparation of Test Specimens The films obtained above were stacked so as to have a layer configuration shown in Table 3 or Table 4 described below, and were sandwiched between auxiliary press plates. The auxiliary press plate is composed of four sheets of a 0.5 mm SUS plate, a 1 mm silicon rubber sheet, a 100 μm SUS plate, and a 0.78 mm Teflon (registered trademark) sheet. The laminated film was sandwiched so that the Teflon sheet was on the inside. While sandwiched between the auxiliary press plates, the laminated film is sandwiched between a pair of press plates of a press machine such that the SUS plate of 0.5 mm is on the outside, and a pneumatic heating press (IMC-1839: manufactured by Imoto Seisakusho) Was pressed at 180 ° C. under an air pressure of 0.2 MPa for 180 seconds to produce a multilayer body.

<Laser marking processing>
Using a laser marking device (“EasyMark IV-E10” manufactured by Roffin Basel), the multilayer body obtained by pressing was subjected to laser marking under the following irradiation conditions.
The laser focused on the layer containing the laser marking agent.

Laser marking conditions Wavelength: 1064 nm (YAG laser)
Scan Speed: 1,000mm / s ^-
Output Energy: 21-30A
Pulse Frequency: 10-100kHz

<Evaluation>
Light 1 (light 1, light of wavelength 365 nm) and light 2 (light 2, light of wavelength 254 nm) are applied to the laser-treated multilayer body, and the color difference between the laser-marked part and the non-treated part is determined. It was observed visually in a dark room.
The results are shown in Tables 3 and 4. The order of lamination of the films of the examples and comparative examples is shown in FIGS.

と お り As is clear from the above results, the use of the multilayer body of the present invention makes it possible to determine the authenticity of the multilayer body.

<Example 6>
In Example 6, a multilayer body having the layer configuration shown in FIG. 6 was manufactured. In FIG. 6, 6 is a red light-emitting film, 3 is a laser marking film, and 9 is a blue-green light-emitting film. By adjusting the concentration of the laser marking agent in the laser marking film 3 so as to have the optical density shown in Table 5, three multilayer bodies were manufactured. Otherwise, the procedure was the same as in Example 1.
The OD value (optical density) is calculated by -Log ₁₀ (transmitted light / incident light) and used as an index of blackness. The color of the laser-marked part and the color of the laser-unmarked part were compared, and the difference was visually observed. The lower the OD value of the laser marking section, the lighter the red color of the laser marking section, and the higher the OD value of the laser marking section, the darker the red color of the laser marking section.

DESCRIPTION OF SYMBOLS 1 Purple light-emitting film 2 Yellow-green light-emitting film 3, 3 'Laser marking film 4 Blank film 5 Orange dye film 6 Red light-emitting film 7 Blue light-emitting film 8 Green light-emitting film 9 Blue-green light-emitting film 10 Multilayer body 11 Yellow-green light-emitting body ( Film containing light 1) and red light emitters (light 1 and light 2) (yellow-green / red film)
21 Film containing violet (light 1) and blue-green (light 2) films (purple / blue-green film)
23 Film containing laser marking agent and yellow-green luminescent material (yellow-green LM film)
Reference Signs List 30 laser irradiation part 31 light shielding layer 51 light source 52 detection part 53 computer 54 image display means 55 printing means 56 medium recording means C1 irradiation light C2 emission color

Claims (22)

1. A resin layer (A) containing a first luminous body, and a resin layer (B) containing a laser light energy absorber,
   Further, a multilayer body which satisfies at least one of the following (1) and (2);
   (1) the resin layer (B) contains a second illuminant different from the first illuminant;
   (2) further comprising a resin layer (C), the resin layer (C) being located on the opposite side of the resin layer (B) from the resin layer (A), and Contains a different second illuminant.
2. 多層 The multilayer body according to claim 1, which satisfies (1).
3. 多層 The multilayer body according to claim 1 or 2, which satisfies (2).
4. The multilayer body according to any one of claims 1 to 3, wherein the second luminous body is at least one selected from luminous bodies excited by at least one of ultraviolet light and infrared light.
5. The method according to any one of claims 1 to 4, wherein the first light emitter and the second light emitter are at least one selected from light emitters excited by light supplied from the same light source. Multilayer body.
6. The multilayer body according to any one of claims 1 to 5, wherein the first luminous body is at least one selected from luminous bodies excited by at least one of ultraviolet light and infrared light.
7. The multilayer body according to any one of claims 1 to 6, wherein the resin layer (A) contains at least one of a polycarbonate resin and a polyester resin.
8. (8) The multilayer body according to any one of (1) to (7), wherein at least one of the resin layer (B) and the resin layer (C) contains at least one of a polycarbonate resin and an amorphous polyester resin.
9. The first luminous body is composed of B, F, Mg, Al, Si, P, S, Cl, Ca, V, Mn, Cu, Zn, Ge, Sr, Y, Ba, La, Ce, Pr, Nd, The multilayer body according to any one of claims 1 to 8, comprising an element selected from the group consisting of Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.
10. The second luminous body is composed of B, F, Mg, Al, Si, P, S, Cl, Ca, V, Mn, Cu, Zn, Ge, Sr, Y, Ba, La, Ce, Pr, Nd, The multilayer body according to any one of claims 1 to 9, comprising an element selected from the group consisting of Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu.
11. The multilayer body according to any one of claims 1 to 10, which is used for determining authenticity.
12. The multilayer body according to any one of claims 1 to 11, which is a security card.
13. The multilayer body according to any one of claims 1 to 12, wherein the resin layer (B) has been subjected to a laser marking process.
14. (14) The multilayer body according to any one of (1) to (13), further comprising a light shielding layer.
15. The multilayer body according to claim 14, wherein the light shielding layer contains a white pigment or a black pigment.
16. The first light-emitting body and the second light-emitting body each capable of emitting light after performing a laser marking process on the resin layer (B) of the multilayer body according to any one of claims 1 to 15. A method for determining the authenticity of a multilayer body, which comprises irradiating light of the type described above.
17. 17. The authenticity determination method according to claim 16, wherein the wavelength of the specific light is in a range of 200 to 450 nm.
18. 17. The authenticity determination method according to claim 16, wherein the wavelength of the specific light is in a range of 800 to 10,000 nm.
19. 19. The authenticity determination method according to claim 16, wherein the multilayer body is a security card.
20. 16. The multilayer body according to any one of claims 1 to 15, wherein the multilayer body after the laser marking processing is performed is irradiated with specific light to emit light from the multilayer body, and
    The light emitted by the multilayer body when the light emitted by the multilayer body after the laser marking processing is performed coincides with the light emitted by the multilayer body after the laser registration processing performed in advance is performed. And an authenticity judgment unit for judging that the light is genuine light.
21. The light emitted by the multilayer body after the pre-registered laser marking processing is performed, the light emitted by the laser marking non-processing section, and the light emitted by the laser marking processing section having a specific optical density, An authenticity determination system according to claim 20.
22. A program written in a computer-readable format,
    Detecting light emitted by the multilayer body according to any one of claims 1 to 15,
    If the light emitted by the multilayer body matches the light emitted by the multilayer body after the laser marking process registered in advance is performed, it is determined that the light emitted by the multilayer body is genuine light. A program for causing a computer to execute a process including an authentication step.
    

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