JPH08211226A - Biodegradable hologram seal - Google Patents

Abstract

PURPOSE: To obtain a biodegradable hologram seal which can be easily biodegraded by burying in soil so as to avoid not only problems of appearance but bad influences on the ecosystem when used seals are discarded. CONSTITUTION: This hologram seal is produced by forming a hologram forming layer 2 having at least a hologram pattern 3 on a plastic film or sheet 1 having biodegradable property, or preparing a plastic film or sheet 1 having biodegradable property and having a hologram pattern 3 formed on one surface, and then forming a reflective thin film layer 4 which transmits or does not transmits light and an adhesive layer 5 in this order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an environmentally friendly hologram which can form a clear hologram image, can be easily disposed of after it is used, is free from fear of pollution due to disposal, and has no adverse effect on the natural environment. The present invention relates to a seal, and more particularly to a hologram seal that is biodegradable when it is landfilled.

[0002]

2. Description of the Related Art In recent years, the development of hologram images utilizing the interference of light capable of reproducing a stereoscopic image has been advanced, and this hologram requires a high manufacturing technology and various forms,
For example, since it can be formed into a label, a sticker, or a foil shape, it can be applied as a forgery prevention means as a video cassette, a compact disc, a sports article, a brand article, a ROM
Board (electronic signal information recording body such as floppy disk)
It is used by sticking to various products such as.

This hologram can be judged at first glance whether it is genuine or counterfeit, and since it is difficult to manufacture, it is widely used for preventing forgery and for imparting security.

Further, each of the hologram products as described above is widely used for general merchandise because a stereoscopic image can be obtained and a high quality feeling can be obtained.

The material of these hologram products, particularly hologram products used as labels, stickers, etc., is manufactured from an almost transparent plastic film (or sheet), for example, a transparent polyethylene terephthalate film (or sheet). ), Or synthetic resins such as polyvinyl chloride, polyester, polycarbonate, polymethylmethacrylate, polystyrene and polypropylene, and natural resins.

[0006]

The hologram seal composed mainly of plastic is used after being attached to various articles and then peeled off as appropriate, or is not peeled off and is discarded together with the article. .

At present, the waste treatment is discarded by treatment such as incineration or landfill, but especially in the waste treatment of plastic, the combustion temperature becomes high in the incineration treatment, which causes the problem of durability of the incinerator. However, there is a problem of pollution due to combustion gas, etc., and there is a problem that it remains in its original form without being decomposed in the soil during landfill treatment, so it remains semi-permanently as waste in the soil and is left in the natural environment. If left unattended, not only aesthetic problems but also adverse effects on biological systems become serious.

The present invention has been made to solve the above problems.

[0009]

The first aspect of the present invention is to provide a transparent hologram forming layer 2 having at least a hologram pattern 3 and a reflective thin film layer 4 on a transparent biodegradable plastic film or sheet 1. And a pressure-sensitive adhesive layer 5 in this order, which is a biodegradable hologram seal.

Next, in the second aspect of the present invention, at least the reflective thin film layer 4 and the pressure-sensitive adhesive layer 5 are provided on the transparent biodegradable plastic film or sheet 1 having the hologram pattern 3 formed on one surface thereof. The biodegradable hologram seal is characterized by being provided in this order.

Further, the present invention is the biodegradable hologram seal according to the first invention, wherein a printing layer 6 is provided on one surface of the hologram forming layer 2.

Further, the present invention is the biodegradable hologram seal according to the second aspect of the present invention, wherein a printing layer 6 is provided on one surface of the biodegradable plastic film or sheet 1. is there.

Further, the present invention provides the biodegradable hologram seal according to the first or second invention, wherein the hologram pattern 3 is provided in contact with the reflective thin film layer 4. is there.

Further, the present invention is the biodegradable hologram seal according to the first invention or the second invention, wherein the reflective thin film layer 4 is a light-impermeable thin film.

In the biodegradable hologram seal according to the first aspect of the present invention, the reflective thin film layer 4 is a light transmissive thin film having a refractive index different from that of the hologram forming layer 2. It is a hologram sticker.

In the biodegradable hologram seal according to the second aspect of the present invention, the reflective thin film layer 4 has the biodegradable plastic film or sheet 1.
It is a biodegradable hologram seal which is a light transmissive thin film having a refractive index different from.

Further, the present invention is the biodegradable hologram seal according to the first or second invention, wherein an adhesive layer 5 is formed on the reflective thin film layer 4. .

[0018]

In the biodegradable hologram seal of the present invention, most of the seal laminate constituent materials are formed of biodegradable plastic, and therefore, the purpose of general anti-counterfeiting and falsification prevention and general When used for the purpose (usual use as a seal), it has durability and water resistance against external impact and water wetting as well as a conventional hologram seal using a non-biodegradable plastic material, and prevents counterfeiting. It can be used as a hologram seal for purposes such as tampering prevention and general purposes, and at the time of disposal after use, by landfilling in soil, microorganisms in the soil will eventually cause water, carbon dioxide It is decomposed (biodegraded) into gas and methane.

In the biodegradable hologram seal of the present invention, the biodegradation treatment by unfilling the soil and the incineration treatment by the combustion furnace are combined to incinerate the undegraded biodegradation. It can be incinerated with lower heat of combustion than the case.

Further, since the biodegradable plastic used for the biodegradable hologram seal of the present invention has excellent transparency, the biodegradable plastic film 1 is more transparent than the conventional hologram seal. A clearer hologram image or printed image can be observed.

In the biodegradable hologram seal of the present invention, the print layer 6 is provided on either side of the biodegradable plastic film 1 (or sheet) in the first invention. , The printed image such as coloring,
With the hologram image by the hologram pattern 3, there is a synergistic effect of enhancing the decorativeness of the seal, and the manufacturing process of printing is newly added in addition to the hologram forming process to further enhance the manufacturing difficulty of the seal and the tamperproof property. When the seal attached to the adherend is peeled off, the biodegradable plastic film 1 of the seal or the hologram forming layer 2 is partially deformed, and at the same time the printing layer 6 is damaged. There is a tampering prevention effect that can confirm the evidence of peeling.

In the biodegradable hologram seal of the present invention, the reflective thin film layer 4 is made of a light transmissive thin film,
The design, pattern, characters, etc. expressed on the adherend to which the sticker is attached can be observed through the eyes, and the decorative and anti-counterfeiting properties are improved, and the sticker has a transparent effect.

[0023]

The biodegradable hologram seal of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side cross-sectional view for explaining the constitution of the biodegradable hologram seal A of the first invention, in which a transparent biodegradable plastic film 1 (or seal) surface is provided.
A transparent thin film hologram forming layer 2 is laminated and a hologram pattern 3 is provided on the surface of the hologram forming layer 2.

In the biodegradable hologram seal A of the first invention shown in FIG. 1, a reflective thin film layer 4 is formed on the hologram forming layer 2 from the surface of the hologram pattern 3 by vacuum deposition or sputtering. Then, a hologram image by the hologram pattern 3 is observed from the transparent biodegradable plastic film 1 side.

Although not shown, in the first invention, the pattern 3 may be formed on the layer boundary surface side between the hologram forming layer 2 and the plastic film 1.

A pressure-sensitive adhesive layer 5 is appropriately formed on the reflective thin film layer 4, and on the pressure-sensitive adhesive layer 5, although not shown,
A release sheet in which a release resin such as a silicone resin is coated on a base sheet is temporarily releasably attached.

The hologram pattern 3 is formed by pressing a nickel-made press plate having a fine concavo-convex pattern forming a relief hologram into the hologram forming layer 2.
It can be formed by heating and pressing the surface. The hologram system of the hologram pattern 3, the spatial frequency of the hologram interference fringe pattern, and the type of hologram image represented thereby are not particularly limited in the present invention, and include natural light, white light, or coherent light. It is a hologram that allows a hologram image to be observed using reference light such as laser light, and the spatial frequency of the interference fringe pattern is, for example, 1000 to 3000 lines / mm.

Further, as the hologram pattern 3, for example, a rainbow hologram, a two-beam interference hologram, or a grating hologram formed to have a fine concavo-convex shape by a diffraction grating (grating) by an electron beam can be applied. Is.

The biodegradable plastic film 1 (or sheet) used for the biodegradable hologram seal of the first invention of the present invention is made of, for example, polylactic acid resin (Lacty (trade name); manufactured by Shimadzu Corporation). , A film (or sheet) formed by biaxially stretching a sheet by T-die melt extrusion and having excellent transparency, for example, a film having a thickness of 40 μm has a light transmittance of 94% or more. is there.

In the first invention, not only the biodegradable plastic film 1 (or sheet) made of the polylactic acid resin but also natural substances (animal natural substances such as gelatin, plant natural substances such as cellulose, etc.) ), Other biodegradable plastics such as microbial products, chemically synthesized substances, etc. are also used.

Specifically, for example, 3-hydroxybutyric acid-3-hydroxyvaleric acid copolymer, P (3HB-3HV
Copolymer; 3-hydroxybutyrate-3-humanroxyvalilate copolymer), P (3HB-4HB copolymer;
3-hydroxybutyrate-4-hydroxybutyrate copolymer) or other microorganism-produced polyester, aliphatic polyester such as polycaprolactone (PCL), polyglycolide such as polylactic acid, polyvinyl alcohol / starch composite film (or Sheet) can be used,
In addition, a composite of these biodegradable plastics may be used, or a material other than the above may be used as long as it is biodegradable.

The above 3HB-3HV copolymer contains 110 to 180 mol% of 3HV molecules.
A melting temperature T _{m of} ℃ was obtained, and 3 HV molecules were 70 mol%
By including the above, the melting temperature T of about 100 to 107 ° C.
_m is obtained.

The above 3HB-4HB copolymer is 4H
By containing 0 to 20 mol% of B molecule, 150 to 1
A melting temperature T _{m of} 80 ° C. was obtained and 4HB molecules were
By containing 1% or more, a melting temperature T _{m of} about 150 ° C. to 155 ° C. can be obtained.

In these plastics having biodegradability, it is possible to add various fillers, such as talc and car, as long as the transparency of the film is not affected. Non-biodegradable substances such as various additives and polymers can be appropriately added as long as they do not significantly affect the deterioration of the biodegradability of the degradable plastic.
For example, for a biodegradable substance, a non-biodegradable substance
Addition of 0% or more lowers the biodegradability, causes processing problems, and lowers transparency.
Not preferred.

The biodegradable plastic film 1 in the biodegradable hologram seal of the first invention of the present invention is
For example, the thickness is 10 to 100 μm, preferably 20 to 70 μm
m transparent film is used.

The hologram forming layer 2 in the biodegradable hologram seal of the first invention is at least 1 / thick of the film thickness of the biodegradable plastic film 1.
It is formed with a thin film thickness of 10 to 1/6 or less.
In the case of a relief type hologram, embossing moldability is good, press unevenness hardly occurs, a bright reproduced image is obtained, and the biodegradable plastic film 1, the hologram forming layer 2,
And a resin having good adhesiveness to the reflective thin film layer 4 is required, and an ordinary synthetic resin not included in biodegradable plastics satisfying such requirements, or an ordinary synthetic resin and a biodegradable plastic Blended resins are used.

For example, as the hologram forming layer 2, an ordinary synthetic resin composition (polyurethane type synthetic resin) having the following mixing ratio is appropriately coated by a gravure coating method, a roll coating method, a hot melt extrusion coating method or the like. Depending on the method, the drying temperature is set to 1
00 to 120 ° C., preferably 110 ° C., and the thickness is, for example, 0.
The thickness is 8 to 1.5 μm, preferably 1.0 μm.

Polyacrylate polyol: 250 parts Nitrocellulose resin: 50 parts Xylene diisocyanate (XDI): 50 parts Isobutyl acetate: 200 parts

When coating is carried out by a coating method such as a gravure coating method or a roll coating method other than the hot melt extrusion coating method, the following solvent is further mixed with the above composition. Methyl ethyl ketone ・ ・ ・ 200 parts Toluene ・ ・ ・ 250 parts

Further, the hologram pattern 3 forming surface formed by embossing on the hologram forming layer 2 has the plate surface temperature of the embossing press plate of the hologram pattern 3,
For example, the temperature is set to 140 to 160 ° C., preferably 155 ° C., and the film is formed by heat and pressure embossing.

As the hologram forming layer 2, in addition,
Polyvinyl chloride, acrylic resin, cellulose acetate butyrate resin, nitrocellulose resin, ethyl cellulose resin, methyl cellulose resin, saturated polyester (polyethylene terephthalate resin), polycarbonate resin, polystyrene resin, polyvinyl chloride resin, etc. Good thermoplastics can be used.

In addition, as the hologram forming layer 2, unsaturated polyester resin, melamine resin, epoxy resin, urethane (meth) acrylate, polyester (meth) acrylate, epoxy (meth) acrylate, polyol (meth) acrylate, melamine. One-part or two-part curable resins such as (meth) acrylate and triazine (meth) acrylate, or mixtures thereof, and thermoformable materials having radically polymerizable unsaturated groups can be used. Other than the above, such as a curable resin (photoresist), any material having stability capable of forming a hologram image can be used.

The reflective thin film layer 4 of the biodegradable hologram seal of the first invention is a layer for reflecting incident light rays,
A light-transmitting reflective thin film layer 4 having a film thickness of 100 to 1000 Å or less, or a light-impermeable reflective thin film layer 4 having a film thickness of 500 to 2000 Å or more, which is a metal, a metal oxide, or a metal sulfide. A thin film of a material, a metal nitride, or the like is formed by a vacuum deposition method. The material forming the reflective thin film layer 4 is not particularly limited,
For example, metals such as aluminum, silver, gold, tin, and silicon, metal oxides such as titanium oxide (TiO), and zinc sulfide (Z
nS) or other metal sulfide, titanium nitride (TiN _x ) or other metal nitride thin film layer, and the light transmissive or light impermeable reflective thin film layer 4 has a thickness It is appropriately set according to the substance used for forming the layer 4.

As the pressure-sensitive adhesive layer 5 laminated on the reflective thin film layer 4 of the biodegradable hologram seal of the first invention by coating, a well-known back-side pressure-sensitive adhesive seal (adhesive seal), label or sticker is known. A pressure-sensitive adhesive or a heat-sensitive adhesive used for imparting adhesiveness to the back surface of sheets such as patches can be used, and the present invention is not particularly limited.

For example, as the pressure-sensitive adhesive, an acrylic adhesive having a composition having the following mixing ratio is used, and a solvent coating method such as a gravure coating method, a roll coating method, a bar coating, a blade coating, an air knife coating or a screen. By a coating method such as a printing method or the like, a drying temperature of, for example, 100 to 120 ° C., preferably 110 ° C., and a thickness of the reflective thin film layer 4 are set.
For example, the thickness is 2 to 25 μm, or 15 to 25 μm, preferably 20 μm.

Acrylic adhesive aggregate component (containing non-volatile solvent content) ・ ・ ・ 30 parts Methyl ethyl ketone (volatile solvent content) ・ ・ ・ 50 parts Toluene (volatile solvent content) ・ ・ ・ 50 parts

Examples of the adhesive aggregate component of the pressure-sensitive adhesive include, in addition to the acrylic type, for example, butyl rubber type,
Aggregate components such as natural rubber-based, silicone rubber-based, polyisobutyl-based, vinyl methacrylate such as alkyl methacrylate and vinyl ester, acrylonitrile, styrene, and vinyl monomer can be used, and as the non-volatile solvent to be contained in the above-mentioned aggregate component, , Fatty acids and polyhydric alcohols can be used. Further, it is possible to appropriately add a modifier, a plasticizer, an antioxidant and the like to the above-mentioned pressure-sensitive adhesive. Further, it may be a re-wetting type adhesive.

FIG. 2 is a side cross-sectional view for explaining the structure of the biodegradable hologram seal B of the second invention, in which a transparent biodegradable plastic film 1 (or seal) surface is provided.
The hologram pattern 3 is provided.

In the biodegradable hologram seal B of the second invention, the reflective thin film layer 4 is formed on the surface of the hologram pattern 3 by vacuum deposition, sputtering or the like, and has a transparent biodegradability. A hologram image by the hologram pattern 3 is observed from the plastic film 1 side. In the second invention, the hologram pattern 3 may be formed on the surface of the plastic film 1 opposite to the reflective thin film layer 4.

A pressure-sensitive adhesive layer 5 is appropriately formed on the reflective thin film layer 4, and on the pressure-sensitive adhesive layer 5, although not shown,
A release sheet in which a release resin such as a silicone resin is coated on a base sheet is temporarily releasably attached.

The hologram pattern 3 is formed by pressing a nickel-made press plate having a fine concave-convex pattern forming a relief hologram into the hologram forming layer 2.
It can be formed by heating and pressing the surface. The hologram system of the hologram pattern 3, the spatial frequency of the hologram interference fringe pattern, and the type of hologram image represented thereby are not particularly limited in the present invention, and include natural light, white light, or coherent light. It is a hologram that allows a hologram image to be observed using reference light such as laser light, and the spatial frequency of the interference fringe pattern is, for example, 1000 to 3000 lines / mm.

Further, as the hologram pattern 3, for example, a rainbow hologram, a two-beam interference hologram, or a grating hologram formed to have a fine uneven shape by a diffraction grating (grating) by an electron beam can be applied. Is.

The biodegradable plastic film 1 (or sheet) used for the biodegradable hologram seal of the second invention is made of, for example, polylactic acid resin (Lacty (trade name); manufactured by Shimadzu Corp.) It is a film (or sheet) obtained by forming a sheet by die melt extrusion and biaxially stretching it, and has excellent transparency of the film.
The light transmittance of the film of μm is 94% or more. Also,
When embossing the hologram pattern 3, the biodegradable plastic that is heated and melted is applied to the plastic film 1
The hologram pattern 3 may be embossed on the surface of the film 1 by using the press plate while extrusion-molding the sheet (or sheet).

In the second invention, not only the biodegradable plastic film (or sheet) made of the polylactic acid resin but also natural substances (animal natural substances such as gelatin, plant natural substances such as cellulose) , Other biodegradable plastics such as microbial products, chemically synthesized substances are also used.

Specifically, for example, 3-hydroxybutyric acid-3-hydroxyvaleric acid copolymer, P (3HB-3H
V) or other microorganism-produced polyester, aliphatic polyester such as polycaprolactone (PCL), polyglycolide such as polylactic acid, or film (or sheet) such as polyvinyl alcohol / starch complex can be used.
It may be a composite of these biodegradable plastics, or may be a material other than the above as long as it is biodegradable.

In these biodegradable plastics, it is possible to add various fillers, such as talc and car, as long as the transparency of the film is not affected. Non-biodegradable substances such as various additives and polymers can be appropriately added as long as they do not significantly affect the deterioration of the biodegradability of the degradable plastic.
For example, for a biodegradable substance, a non-biodegradable substance
Addition of 0% or more lowers the biodegradability, causes processing problems, and lowers transparency.
Not preferred.

The biodegradable plastic film 1 (or sheet) in the biodegradable hologram seal of the second invention is, for example, a transparent film (or sheet) having a thickness of 10 to 100 μm or more, preferably 20 to 70 μm. used.

Further, particularly in the case of a relief type hologram, the biodegradable plastic film 1 (or sheet)
Is required to have good embossing moldability and less likely to cause uneven press, and the melting temperature T _m is at least the embossing molding temperature (for example, 150 to 180 ° C., preferably 155).
℃) or less is required.

The biodegradable plastic used for the biodegradable plastic film 1 (or sheet) is as follows.
The 3HB-3HV copolymer (3-
Hydroxybutyrate-3-hydroxyvalerate copolymer), 3HB-4HB copolymer (3-hydroxybutyrate-4-hydroxybutyrate copolymer) can be used.

The surface on which the hologram pattern 3 is formed by embossing on the surface of the biodegradable plastic film 1 (or sheet) has the plate surface temperature of the embossing press plate of the hologram pattern 3 of, for example, 150 to 160.
C., preferably 155.degree. C., for embossing.

The reflective thin film layer 4 in the second invention is
A layer that reflects an incident light ray and has a thickness of 100 to 1000
A light-impermeable or light-transmitting thin film of Å or 1000 Å or more of metal or metal oxide, metal sulfide, metal nitride or the like is formed by a vacuum deposition method. The substance used for the reflective thin film layer 5 is not particularly limited, but for example, a metal such as aluminum, silver, gold, tin, or silicon, a metal oxide such as titanium oxide (TiO), zinc sulfide (ZnS), or the like. Metal sulfide, titanium nitride (Ti
It is a thin film layer made of a metal nitride such as N _x ).

The pressure-sensitive adhesive layer 5 laminated on the reflective thin film layer 4 by coating has the above-mentioned first structure.
A commonly used pressure-sensitive adhesive such as a pressure-sensitive pressure-sensitive adhesive or a heat-sensitive pressure-sensitive adhesive in the invention can be used, and the invention is not particularly limited.

FIG. 3 shows another embodiment of the first invention (see FIG. 1) of the present invention, which is a biodegradable hologram seal C having a printing layer 6.

In this biodegradable hologram seal C, a hologram forming layer 2 is laminated and formed on the surface of a biodegradable plastic film 1 (or sheet).

Further, on the surface of the hologram forming layer 2,
The hologram pattern 3 is provided, and the print layer 6 is formed on the pattern 3 side. In addition, in the other embodiment of the first invention, the printing layer 3 is formed on the opposite side of the hologram forming layer 2 from the side where the hologram pattern 3 is formed (a laminated boundary surface between the plastic film 1 and the hologram forming layer 2), or plastic. It may be formed on the surface of the film 1.

On the printed layer 6 side of the hologram forming layer 2 on which the hologram pattern 3 side is formed, a reflective thin film layer 4 is formed by a vacuum deposition method, a sputtering method or the like.

The print layer 6 is formed by printing an appropriate design such as characters, marks, coloring, or a pattern. As a printing method, a printing method such as offset printing or screen printing is used in addition to the gravure printing method. There is.

For the printing layer 6, for example, a gravure printing method is used in which a drying temperature is adjusted by using gravure inks of one or more colors having a composition having the following composition ratios.
For example, 100 to 120 ° C., preferably about 100 ° C., and the thickness is, for example, 0.7 to 1.5 μm, preferably 1.0 μm.
It is formed by m.

Ink binder made of polyester-based synthetic resin: 25 parts by weight Coloring pigment: 8 parts by weight Black pigment (carbon black) or yellow pigment or magenta pigment or cyan pigment Solvent methyl ethyl ketone: 70 parts by weight Toluene・ 30 parts by weight

A pressure-sensitive adhesive layer 5 is appropriately formed on the reflective thin film layer 4, and on the pressure-sensitive adhesive layer 5, although not shown,
A release sheet in which a release resin such as a silicone resin is coated on a base sheet is temporarily releasably attached.

FIG. 4 shows another embodiment of the second invention (see FIG. 2) of the present invention, which is a biodegradable hologram seal D having a printing layer 6.

The biodegradable hologram seal D is provided with a hologram pattern 3 on the surface of the biodegradable plastic film 1 (or sheet), and a printing layer 6 is formed on the pattern 3 side.

A reflective thin film layer 4 is formed on the print layer 6 side of the hologram pattern 3 formation side by a vacuum deposition method, a sputtering method or the like. Although not shown,
In the other embodiment of the second invention, the printing layer 6 may be formed on the side opposite to the side on which the hologram pattern 3 formed on the plastic film 1 (or sheet) is formed.

The print layer 6 is formed by printing an appropriate design such as characters, marks, coloring and patterns. As a printing method, printing is performed by a method such as offset printing or screen printing other than the gravure printing method. There is.

For the printing layer 6, for example, a gravure printing method is used in which the drying temperature is adjusted by using gravure inks having a composition of the following composition ratios and appropriately selected from one or more colors.
For example, 100 to 120 ° C., preferably about 100 ° C., and the thickness is, for example, 0.7 to 1.5 μm, preferably 1.0 μm.
It is formed by m.

Ink binder made of polyester synthetic resin: 25 parts by weight Coloring pigment: 8 parts by weight Black pigment (carbon black) or yellow pigment or magenta pigment or cyan pigment Solvent methyl ethyl ketone: 70 parts by weight Toluene・ 30 parts by weight

A pressure-sensitive adhesive layer 5 is appropriately formed on the reflective thin film layer 4, and on the pressure-sensitive adhesive layer 5, although not shown,
A release sheet in which a release resin such as a silicone resin is coated on a base sheet is temporarily releasably attached.

The biodegradable hologram seal A (see FIG. 1) in the embodiment of the first invention of the present invention or the biodegradable hologram seal B in the embodiment of the second invention (see FIG. 2), or Biodegradable hologram seal C in another embodiment of the first invention (see FIG. 3) or biodegradable hologram seal D in another embodiment of the second invention.
(Refer to FIG. 4), each of the reflective thin film layers 4 provided in
At least a light-impermeable (opaque) reflective thin film layer 4 that does not transmit light in the visible light region, or a light-transmissive (translucent) reflective thin film layer 4 that transmits light in the visible light region. Is.

For example, when the reflective thin film layer 4 is the light-impermeable reflective thin film layer 4, aluminum, zinc, or a metal thereof is formed by a vacuum deposition method, a sputtering method, an ion plating method, or the like. An opaque reflective thin film layer 4 formed by depositing a metal vapor-deposited film of a compound with a film thickness of 500 to 2000Å or more 2000 to 4000Å or a reflective thin film obtained by laminating and adhering an opaque metal foil layer such as an aluminum foil It is layer 4.

When the reflective thin film layer 4 is the light transmissive reflective thin film layer 4, aluminum, zinc, or a metal compound thereof is formed by a vacuum deposition method, a sputtering method, an ion plating method, or the like. The metal vapor deposition film of 100 to 1000Å or 100
Below Å, it is a transparent or transparent reflective thin film layer 4 formed of an extremely thin film.

In the biodegradable hologram seal of the first invention of the present invention, when the light transmissive reflective thin film layer 4 is used, the hologram forming layer 2 and the light transmissive reflective thin film layer 4 are They are provided so as to have different refractive indexes. The hologram forming layer 2 and the biodegradable plastic film 1 (or sheet) having a similar refractive index are used.

The reflective thin film layer 4 has a light-transmitting property and a surface-reflecting property for reflecting a part of incident light on the surface.

Light incident on the light-transmitting reflective thin film layer 4 from the transparent hologram forming layer 2 side is at the interface due to the difference in refractive index between the hologram forming layer 2 and the reflective thin film layer 4. A part of the light causes surface reflection, and the hologram forming layer 2
It is ejected to the side and is used to reproduce the hologram image.

This partial surface reflection occurs when light enters a large layer from a layer having a small refractive index, and the amount of reflected light increases as the difference in refractive index between the layers increases.

The refractive index of the light-transmitting reflective thin film layer 4 is the refractive index of the hologram forming layer 2 (for example, n = 1.
3 to 1.6) and the difference in refractive index is as large as possible.

The biodegradable hologram seal A or C of the first invention shown in FIG. 1 or FIG.
A light-transmitting reflective thin film layer 4 made of a zinc sulfide (ZnS) vapor deposition film of 500 Å or less is formed, and an image pattern or color such as a design, a pattern or a character is formed on the surface of an adherend to which this sticker is stuck. Is displayed, the reflective thin film layer 4 whose image pattern and color on the surface of the adherend are light-transmissive.
And the hologram image by the hologram pattern 3 of the seal A or C can be visually observed from the hologram forming layer 2 side, and the decorativeness can be further enhanced.

In the biodegradable hologram seal according to the second aspect of the present invention, the light transmissive reflective thin film layer 4 is used.
When using, biodegradable plastic film 1
(Or the sheet) and the light-transmissive reflective thin film layer 4 are provided so as to have different refractive indexes.

The reflective thin film layer 4 has a light-transmitting property and a surface-reflecting property for partially reflecting the incident light on the surface.

Transparent biodegradable plastic film 1
The light incident on the reflective thin film layer 4 from the (or sheet) side is partially reflected at the interface due to the difference in the refractive index between the film 1 and the reflective thin film layer 4 to cause surface reflection. It is ejected to the side and is used to reproduce the hologram image.

This partial surface reflection occurs when light enters from a layer having a small refractive index to a layer having a large refractive index, and the amount of reflected light increases as the difference in refractive index between the layers increases.

The refractive index of the light transmissive reflective thin film layer 4 is the refractive index of the film 1 (or sheet) (for example, n.
= 1.3 to 1.6), as large as possible,
It is suitable that the difference in refractive index is large.

The biodegradable hologram seal B or D of the second invention shown in FIG. 2 or 4 has, for example, a thickness of 450.
The light-transmitting reflective thin film layer 4 is formed by a zinc sulfide (ZnS) vapor deposition film having a thickness of about 500 Å or less, and the seal B
Alternatively, the hologram image by the hologram pattern 3 of D can be visually confirmed from the film 1 (or sheet) side together with the image pattern and color such as the design, the pattern, and the character displayed on the surface of the adherend to which the sticker is attached. , Further enhances the decorativeness.

<Example 1> Film thickness without biodegradability 1.
After the biodegradable plastic was melted by heating and extruded into a sheet form from the T die on the hologram forming layer 2 made of a polyethylene terephthalate film having a thickness of 5 μm, the biodegradable plastic film 1 having a thickness of 50 μm was laminated, A hologram pattern 3 was embossed on the hologram forming layer 2 by applying heat and pressure at 155 ° C. using a press plate for hologram pattern embossing.

Next, an opaque reflective thin film layer 4 having a film thickness of 1000 to 1200Å was formed on the hologram pattern 3 of the hologram forming layer 2 by a vacuum deposition method using aluminum.

Then, an acrylic adhesive is coated on the reflective thin film layer 4 to a thickness of 10 μm to form an adhesive layer 5, and the biodegradable hologram seal A of the first invention is formed.
It was created.

Example 2 The same procedure as in Example 1 was carried out except that the gravure printing method was used to form the printing layer 6 on the hologram pattern 3 of the hologram forming layer 2 in the above Example 1 using the gravure printing method. 1 A biodegradable hologram seal C of the invention was prepared.

Example 3 A biodegradable plastic and a non-biodegradable plastic (normal synthetic resin) were separately heated and melted to form a sheet from a T-die by a two-layer extrusion method. After extrusion, a plastic film 1 having a film thickness of 50 μm having biodegradability and a hologram forming layer 2 having a film thickness of 1.5 μm having no biodegradability are laminated and formed, and then a hologram pattern embossed on the surface of the hologram forming layer 2. Holographic pattern 3 was embossed by applying heat and pressure at 155 ° C. using a press plate.

Next, an opaque reflective thin film layer 4 having a film thickness of 1000 to 1200Å was formed on the hologram pattern 3 of the hologram forming layer 2 by a vacuum deposition method using aluminum.

Then, an acrylic adhesive is coated on the reflective thin film layer 4 to a thickness of 10 μm to form an adhesive layer 5, and the biodegradable hologram seal A of the first invention is formed.
It was created.

Example 4 The same as Example 3 except that the gravure printing method was used to form the printing layer 6 from above the hologram pattern 3 of the hologram forming layer 2 in the above Example 3 using the gravure printing method. The biodegradable hologram seal C of the first invention was prepared.

<Embodiment 8> A biodegradable plastic is melted by heating and extruded into a sheet to give a film thickness of 60 μm.
After forming the biodegradable plastic film 1, the hologram pattern 3 was embossed on the surface of the plastic film 1 by applying heat and pressure at 155 ° C. using a press plate for hologram pattern embossing.

Next, from above the hologram pattern 3,
A film thickness of 100 is obtained by vacuum deposition using aluminum.
An opaque reflective thin film layer 4 having a thickness of 0 to 1200 Å was formed.

Thereafter, an acrylic adhesive is coated on the reflective thin film layer 4 to a thickness of 10 μm to form an adhesive layer 5, and the biodegradable hologram seal B of the second invention is formed.
It was created.

<Example 6> The same procedure as in Example 5 was performed except that the printing layer 6 was formed on the hologram pattern 3 of the plastic film 1 in Example 5 by using a gravure ink by a gravure printing method. 2 A biodegradable hologram seal D of the invention was prepared.

<Comparative Example> As a normal plastic film having no biodegradability used for a conventional hologram seal, a polyethylene terephthalate film (Lumirror (trade name); manufactured by Toray Industries, Inc.) having a thickness of 50 μm was formed on the surface. The hologram pattern was embossed by heating and pressing at 155 ° C. using a press plate for hologram pattern embossing.

Subsequently, a printing layer was formed on the hologram pattern of the film by a gravure printing method using gravure ink.

Next, a film having a thickness of 1 is formed on the hologram pattern and the printed layer by vacuum vapor deposition using aluminum.
An opaque reflective thin film layer 4 having a thickness of 000 to 1200 Å was formed.

Thereafter, an acrylic pressure-sensitive adhesive was coated on the reflective thin film layer to a thickness of 10 μm to form a pressure-sensitive adhesive layer, and a hologram seal was prepared.

<Comparison Results> The biodegradable hologram seal of the present invention of Examples 1 to 6 and the hologram seal of Comparative Example were respectively put in an electric dust disposer (manufactured by Hitachi Ltd.). The state of biodegradation was observed regularly.

As a result, the biodegradable hologram seals A and C of the first invention according to the above Examples 1 and 2 started to become cloudy after 3 months, and the seals maintained their shape, but the seal group Partial disintegration was observed in the biodegradable plastic film 1 as a material.

After 6 months, the biodegradable hologram seals A and C have the biodegradable plastic film 1 as the base material and the thin film hologram forming layer 2 having no biodegradability. It was confirmed that the plastic film 1 disintegrated almost completely, and decomposed to a state where the shape of the plastic film 1 could not be confirmed.

Further, the biodegradable hologram seals A and C of the first invention according to the above-mentioned Examples 3 and 4 started to become cloudy after 3 months, like the above-mentioned Examples 1 and 2. Although the shape was retained, a partial disintegration was observed in the biodegradable plastic film 1 as the seal substrate.

After 6 months, the biodegradable hologram seals A and C have the biodegradable plastic film 1 as a base material and the thin film hologram forming layer 2 having no biodegradability. It was confirmed that the plastic film 1 disintegrated almost completely, and decomposed to a state where the shape of the plastic film 1 could not be confirmed.

In addition, the biodegradable hologram seals B and D of the second invention according to the fifth and sixth embodiments, after 3 months,
A biodegradable plastic film 1 as a seal base material, although the seal begins to become cloudy and retains its shape.
At that time, a partial collapse was observed.

After 6 months, the biodegradable hologram seals B and D can be decomposed to a state in which the plastic film 1 as the base material is almost completely collapsed and the seal shape cannot be confirmed. confirmed.

On the other hand, in the hologram seal according to the above comparative example, even after 6 months, the film not having biodegradability due to polyethylene terephthalate did not change to the extent that it turned a little yellow, and no decomposition was observed. .

[0118]

The biodegradable hologram seal of the present invention comprises:
It has the same water resistance as a conventional hologram seal, and it has the same or better aesthetics and design as the conventional one.
With anti-counterfeiting property and tamper-proof property, a clearer hologram image than the conventional one can be obtained, which has the effect of further improving the design and decorative properties, and the seal of the present invention after being used, It can be easily decomposed by leaving it in the environment such as soil where microorganisms live or landfill, and it has the effect that it can be disposed of without adversely affecting the global environment.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a biodegradable hologram seal of the first invention.

FIG. 2 is a side sectional view showing an embodiment of a biodegradable hologram seal of the second invention.

FIG. 3 is a side sectional view showing another embodiment of the biodegradable hologram seal of the first invention.

FIG. 4 is a side sectional view showing another embodiment of the biodegradable hologram seal of the second invention.

[Explanation of symbols]

1 ... Biodegradable plastic film (or sheet) 2
... Hologram forming layer 3 ... Hologram pattern 4 ... Reflective thin film layer 5 ... Adhesive layer 6 ... Printing layer A, C ... Biodegradable hologram seal B according to the first invention B, D ... Biodegradable hologram seal according to the second invention

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Claims (9)

[Claims] 1. A transparent hologram forming layer 2 having at least a hologram pattern 3 and a reflective thin film layer 4 on a transparent biodegradable plastic film or sheet 1.
A biodegradable hologram seal, characterized in that the adhesive layer 5 and the adhesive layer 5 are provided in this order. 2. A transparent biodegradable plastic film or sheet 1 having a hologram pattern 3 formed on one surface thereof, and at least a reflective thin film layer 4 and an adhesive layer 5 are provided in this order. A biodegradable hologram sticker. 3. The biodegradable hologram seal according to claim 1, wherein a printing layer 6 is provided on one surface of the hologram forming layer 2. 4. The biodegradable hologram seal according to claim 2, wherein a printing layer 6 is provided on one surface of the biodegradable plastic film or sheet 1. 5. The hologram pattern 3 is provided so as to be in contact with the reflective thin film layer 4.
The biodegradable hologram sticker described. 6. The biodegradable hologram seal according to claim 1, wherein the reflective thin film layer 4 is a light-impermeable thin film layer. 7. The biodegradable hologram seal according to claim 1, wherein the reflective thin film layer 4 is a light transmissive thin film having a refractive index different from that of the hologram forming layer 2. 8. The biodegradable hologram seal according to claim 2, wherein the reflective thin film layer 4 is a light transmissive thin film having a refractive index different from that of the biodegradable plastic film or sheet 1. 9. The biodegradable hologram seal according to claim 1, wherein an adhesive layer 5 is formed on the reflective thin film layer 4.