JP4788083B2 - The manufacturing method of the sheet | seat for affixing which can peel a base material sheet. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is accompanied by a temporary base sheet, and finally, after the transfer layer to be transferred is adhered onto the adherend, the base sheet is used again to peel off the base sheet. Affixing sheet that can peel material sheet Manufacturing method It is about.
[0002]
[Prior art]
Cards such as deposit and saving cards issued by financial institutions and credit cards issued by credit card companies must have a light diffraction structure such as a diffraction grating pattern or hologram to ensure their authenticity. There are many.
In addition, light diffraction structures are often applied to products or cases in which counterfeit products are easily available, such as famous brand watches.
[0003]
Since the diffraction grating pattern and the hologram are similar in appearance, they are often called holograms or hologram seals if they have a sealing function. Except for the case of “diffraction grating”, the term “hologram” is used to mean including a diffraction grating, particularly a diffraction grating pattern.
[0004]
The reason why optical diffraction structures such as holograms are used in various fields other than the above examples is that the optical diffraction structures have difficulty in manufacturing, and are visually interfered. This is because it has a color and is easy to catch the eye, so that it is excellent in design and, in some cases, has a merit that some may break when it is peeled off.
[0005]
In order to apply the light diffraction structure to various adherends, it is possible in principle to manufacture the light diffraction structure directly on the adherend, but the target adherends to be applied are individually one by one. In general, a laminated sheet including many light diffractive structures is manufactured in a sheet state different from the adherend, and the light diffractive structure is applied to each adherend. Has been adopted.
[0006]
As a laminated sheet including such a light diffractive structure, an adhesive sheet in which a transfer layer including a light diffractive structure is laminated on a base sheet via a release layer is used, and is aligned with a predetermined position of an adherend. Then, after pasting and pasting the transfer layer, the substrate sheet is peeled off. Since the transfer layer has a laminated structure of thin layers, it is difficult to peel off and transfer to other adherends after pasting, so that there is an advantage that unauthorized transfer can be prevented.
[0007]
Here, the base sheet is laminated so that it can be peeled off. However, if it is easy to peel off, the transfer layer may peel off from the base sheet together with the release layer only by careless handling. If it is difficult, the part of the release layer or part of the transfer layer may be peeled off while adhering to the substrate sheet at the time of peeling, and the surface of the transfer layer may be damaged.
[0008]
In addition, a transfer layer including a light diffraction structure such as a hologram or a diffraction grating often uses an ultraviolet curable resin when forming a layer having a light diffraction structure. The release layer may be deteriorated or deteriorated, and the adhesive force between the base sheet and the release layer may increase unintentionally.
Alternatively, light diffractive structures such as holograms and diffraction gratings are usually accompanied by a light reflective layer to increase their visibility, but due to the heat of the evaporated metal provided during the lamination of the light reflective layer. The release layer may be deteriorated or deteriorated, and the adhesive force between the base sheet and the release layer may increase unintentionally.
[0009]
[Problems to be solved by the invention]
In the present invention, in the above-described conventional technology, the adhesion between the base sheet and the release layer of the application sheet was insufficient, and it was difficult to peel inadvertently or was difficult to peel, and the transfer When the layer contains a light diffractive structure, it is exposed to excessive UV irradiation at the time of formation, and the release layer deteriorates or deteriorates, and the adhesive force between the base sheet and the release layer increases excessively, or the light diffractive structure It is intended to eliminate the excessive increase in the adhesive force between the base sheet and the release layer due to the heat during the lamination of the light-reflective layer.
[0010]
[Means for solving the problems]
In this invention, said subject was able to be solved by prescribing | regulating the thickness of the peeling layer between the base material sheet of a sheet | seat for affixing, and a transfer layer.
[0011]
1st invention is a base material sheet , Release layer, intermediate layer, light diffraction structure layer, light reflection layer, primer layer, and heat sensitive adhesive layer Affixing sheet that can peel the base sheet (1) To the base sheet surface, Thickness is 1.5μm or more A release layer forming step for forming the release layer, (2) an intermediate layer forming step for forming the intermediate layer containing an ultraviolet absorber on the release layer surface, and (3) an ultraviolet absorber on the intermediate layer surface, From ionizing radiation curable resin An uncured optical diffraction structure forming layer forming step for forming an uncured optical diffraction structure forming layer, and (4) forming relief holograms or fine irregularities of a diffraction grating on the surface of the optical diffraction structure forming layer, A step of forming a light diffractive structure layer having fine irregularities by irradiating ultraviolet rays from the opposite side of the material sheet to cure the ionizing radiation curable resin to form a light diffractive structure layer having fine irregularities; (5) the light diffraction A light reflecting layer forming step of forming the transparent light reflecting layer by a vapor deposition method on the fine irregular surface of the structural layer; (6) a primer layer forming step of forming the primer layer on the light reflecting layer surface; 7) A heat-sensitive adhesive layer forming step of forming the heat-sensitive adhesive layer containing a release agent on the primer layer surface. A sticking sheet capable of peeling a substrate sheet characterized by that Manufacturing method It is.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1 (a), the sticking sheet 1 of the present invention is obtained by sequentially laminating a release layer 3 and a transfer layer 4 on the lower surface of a base sheet 2, and the transfer layer 4 is, for example, The light-diffusing structure forming layer 5, the light-reflective layer 6, and the heat-sensitive adhesive layer 7 having the fine irregularities 5a of the light-diffracting structure on the lower surface side from the peeling layer 3 side have a laminated structure in which they are laminated in order. is there.
[0013]
As shown in FIG. 1B, the sticking sheet 1 of the present invention is obtained by sequentially laminating a release layer 3 and a transfer layer 4 on the lower surface of a base sheet 2, and the transfer layer 4 is peeled off. From the layer 3 side, the intermediate layer 8, the light diffraction structure forming layer 5 having the fine irregularities 5 a of the light diffraction structure on the lower surface side, the light reflective layer 6, the primer layer 9, and the heat-sensitive adhesive layer 7 were laminated in order. It may have a laminated structure.
[0014]
The above two examples are examples in which the present invention is applied to an affixing sheet 1 capable of transferring a light diffraction structure such as a hologram. However, the affixing sheet 1 of the present invention has a simpler transfer layer 4. For example, the transfer layer 4 is either a layer made of a cured product of an ionizing radiation curable resin, or a thin film layer such as a metal or metal oxide formed by a vapor deposition method such as vapor deposition. These may be used alone or may have a laminated structure in which they are laminated.
In the above, in the case where the transfer layer 4 is a layer made of a cured product of an ionizing radiation curable resin, the durability of the transfer layer after being applied to an adherend is compared with a case where the transfer layer 4 is a layer made of a thermoplastic resin. The property is excellent.
[0015]
As a typical example in the case where the transfer layer 4 has a laminated structure of a layer made of a cured product of an ionizing radiation curable resin and a thin film layer formed by a gas-phase film forming method, the transfer layer 4 is from the side of the release layer 3. There is a laminated structure of a light diffractive structure forming layer 5 made of a cured product of an ionizing radiation curable resin and having fine irregularities 5a of a light diffractive structure on the lower surface side, and a light reflective layer 6 made of a thin film layer. The laminated structure provides an optical diffraction structure with high visibility and high durability.
[0016]
The layer made of the cured product of the ionizing radiation curable resin may be a cured product of the ultraviolet curable resin, and thus the light diffraction structure forming layer 5 may be made of the cured product of the ultraviolet curable resin. Further, it may contain an ultraviolet absorber.
The intermediate layer 8 described above may also contain an ultraviolet absorber.
[0017]
The lowermost heat-sensitive adhesive layer 7 in FIGS. 1A and 1B has the lowermost surface of the transfer layer 4 other than the heat-sensitive adhesive layer 7 or the surface of the adherend to which the application sheet 1 is applied. When the adhesive is applied or when the adhesive is applied to the surface of the adherend or the lower surface of the sticking sheet 1 at the time of sticking, it may be omitted.
[0018]
As the base material sheet 2 of the sticking sheet of the present invention, for example, a polyester resin film such as a transparent polyethylene terephthalate resin film, or a polyolefin resin film, which is usually used as a base for a transfer film may be used. it can.
[0019]
The release layer 3 is adhered to the substrate sheet 2 and the transfer layer 4 so as not to be easily peeled before the sheet 1 for application is attached to the adherend and the substrate sheet 2 is peeled off. When peeling the base material sheet 2, it is for enabling smooth peeling to be performed. In addition, when peeling the base material sheet 2, the peeling layer 3 said here leaves | separates from the base material sheet 2, and remains with adhering to the transfer layer 4 side.
[0020]
The release layer 3 is not preferably composed of a resin that adheres firmly to the base sheet 2, and therefore is composed of a resin that is selected while avoiding material similar to the material of the base sheet 2. It is preferable.
Further, for the purpose of improving the peelability, a nitrocellulose resin or a cellulose acetate resin having poor adhesion to the base sheet 2 can be added, and for the same purpose, a silicone resin, silicone oil, wax or the like is added. You can also.
[0021]
The release layer 3 is usually formed to a thickness of about 1 to 5 μm, but when the transfer layer is made of a cured product of an ionizing radiation curable resin composition, or the transfer layer is a thin film layer formed by a vapor deposition method. Is preferably 1.5 μm or more, more preferably 2.0 μm or more.
When the thickness of the release layer 3 is less than 1.5 μm, the transfer layer is made of a cured product of an ionizing radiation curable resin composition, or the transfer layer is a thin film layer formed by a vapor deposition method. Is not preferable because the release layer 3 is easily deteriorated by irradiation with ionizing radiation during the formation of these layers or by the heat of the vapor of the thin film material. If the thickness of the release layer 3 is 1.5 μm or more, the influence of the substantial deterioration is small, but in order to obtain almost no influence of the deterioration, the thickness of the release layer is preferably 2.0 μm or more. .
[0022]
Adjustment of the adhesive force between the base sheet 2 and the release layer 3 can be performed by selecting a resin constituting the release layer 3.
When the base sheet 2 is a polyethylene terephthalate resin film or the like, a strong solution is obtained by applying a resin solution in which a polyester resin such as a linear polyester resin is dissolved to the base sheet 2 and then drying it. The polyester resin film is formed and is not suitable as the release layer 3.
Examples of a resin that can form a coating film having an adhesive force that does not hinder the use on the base sheet 2 that is a polyethylene terephthalate resin film include acrylic resins such as vinyl chloride / vinyl acetate copolymer or polymethyl methacrylate resin. The release layer 3 is preferably formed using these resins alone or in combination.
[0023]
The thickness of the release layer 3 is as described above, but in order to avoid the effect of ionizing radiation during the formation of the transfer layer or the heat of the vapor of the thin film material, the dose of ionizing radiation should be reduced. It is preferable to reduce the thickness of the thin film formed by the vapor deposition method. For example, the thickness of the thin film layer is preferably 80 nm or less, although it depends on the vapor temperature of the material constituting the thin film layer.
[0024]
Although it is difficult to reduce the irradiation dose of ionizing radiation from the viewpoint of curing the ionizing radiation curable resin, the transfer layer 4 contains a cured product of an ionizing radiation curable resin, particularly a cured product of an ultraviolet curable resin. In this case, ultraviolet irradiation is performed from the side opposite to the base sheet 1 of the sticking sheet 1, and an ultraviolet absorber is contained in a layer located on the ultraviolet light source side with respect to the release layer 3 to suppress the influence of ultraviolet irradiation. It is also preferable. The layer that can contain the ultraviolet absorber is the intermediate layer 8, the light diffraction structure forming layer 5, or the primer layer 9.
[0025]
Moreover, it is preferable to mix | blend a stabilizer with the resin which comprises the peeling layer 3 in the meaning which prevents the change of the peeling force between the base material sheet 2 and the peeling layer 3, and a stabilizer removes the peeling layer 3. When the resin which comprises comprises multiple types, it is more preferable to mix | blend the compounding agent suitable for each of each resin. In the case where the transfer layer is composed only of a cured product of the ionizing radiation curable resin composition, or the transfer layer is composed only of a thin film layer formed by a vapor deposition method, the stabilizer is mixed into the release layer 3. It is also effective when it consists of only these combinations.
Stabilizers include those that prevent dehydrochlorination for vinyl chloride resins, antioxidants, or light stabilizers.
[0026]
There are metal soap type stabilizers, organotin compound type stabilizers, lead compound type stabilizers, antimony compound type stabilizers, and epoxy which is a stabilizing aid for preventing dehydrochlorination for vinyl chloride resins. It may be used in combination with a compound, a phosphite compound, a β-diketone compound, or the like.
Antioxidants include phenolic antioxidants such as stearyl-β- (3,5-di-t-butyl-4-hydroxyphenyl) propionate (Asahi Denka Kogyo Co., Ltd., ADK STAB AO-50), dilauryl There are organic sulfur compound antioxidants such as −3,3′-thiodipropionate, or organic phosphorus compound antioxidants such as trisnonylphenyl phosphite.
The light stabilizer is an ultraviolet absorber (including a hindered amine compound) described later.
Although depending on the kind of stabilizer, these stabilizers may be blended at a ratio of 1/100000 to 1/100, preferably 1/10000 to 1/1000, based on mass.
[0027]
The light diffraction structure forming layer 5 has a fine unevenness (hereinafter, simply referred to as unevenness) 5a of the light diffraction structure on one side of a layer made of a transparent synthetic resin, preferably a cured product of an ionizing radiation curable resin. It is formed.
As a typical example of a light diffraction structure, a planar hologram and a volume hologram can be used. Specific examples include a relief hologram, a Lippmann hologram, a Furnell hologram, a Fraunhofer hologram, a lensless Fourier transform hologram, a laser reproduction hologram ( Image holograms), white light reproduction holograms (rainbow holograms, etc.), color holograms, computer holograms, hologram displays, multiplex holograms, holographic stereograms, holographic diffraction gratings and the like.
[0028]
The transparent synthetic resin constituting the light diffraction structure forming layer 5 may be a thermosetting resin such as an unsaturated polyester other than a thermoplastic resin such as polyvinyl chloride, acrylic resin (eg, PMMA), polystyrene, or polycarbonate. , Melamine, epoxy, polyester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, polyether (meth) acrylate, polyol (meth) acrylate, melamine (meth) acrylate, or triazine acrylate. .
[0029]
Each of the above transparent synthetic resins can be used alone or in combination with the thermoplastic resin and the thermosetting resin, and further, a thermoformable substance having a radical polymerizable unsaturated group, or A radical polymerizable unsaturated monomer added to these to make them ionizing radiation curable can be used. In addition, photosensitive materials such as silver salt, dichromated gelatin, thermoplastic, diazo photosensitive material, photoresist, ferroelectric, photochromic material, thermochromic material, chalcogen glass, and the like can also be used.
[0030]
The light diffraction structure can be formed on the light diffraction structure forming layer made of the above-described resin by a conventionally known method using the above materials. For example, when recording the diffraction fringes or hologram interference fringes as a relief of the surface irregularities, the original plate on which the diffraction gratings or interference fringes are recorded in the irregular shape is used as a press mold, and the above-described resin layer is formed on the resin layer. The concavo-convex pattern of the original plate can be duplicated by stacking the original plate and heat-pressing both of them with an appropriate means such as a heating roll. In the case of using a photopolymer, the photopolymer can be similarly coated on the protective layer of the laminated sheet, and then duplicated by irradiating ionizing radiation such as ultraviolet rays with the original being overlaid.
[0031]
As described above, a method of recording diffraction gratings or hologram interference fringes on the surface of the optical diffraction structure layer as a relief of the surface irregularities is particularly preferable because it is mass-productive and can reduce the cost. The film thickness of the light diffraction structure forming layer 5 is preferably in the range of 0.1 to 6 μm, and more preferably in the range of 0.1 to 4 μm.
[0032]
When a diffraction grating or a hologram interference fringe is recorded as an uneven relief on the surface of the light diffraction structure forming layer 5, the light reflective layer 6 is laminated on the relief surface in order to increase the diffraction efficiency. Preferably, such a light reflective layer 6 is light The diffraction structure forming layer 5 includes a transparent reflection layer having a different refractive index.
[0034]
The latter material constituting the transparent reflection layer having a refractive index different from that of the light diffraction structure forming layer 5 is ZnS, TiO, which has a higher refractive index than the light diffraction structure forming layer 5. ₂ , Al ₂ O _Three , Sb ₂ S _Three , SiO, TiO, or SiO ₂ Etc.
Further, the refractive index is smaller than that of the light diffraction structure forming layer 5, LiF, MgF ₂ Or AlF _Three Etc.
[0035]
Further, a transparent synthetic resin having a refractive index different from that of the light diffraction structure forming layer 5, such as a layer of polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl acetate, polyethylene, polypropylene, or polymethyl methacrylate, is a light reflective layer. 6 can also be used as a material constituting 6.
[0036]
The film thickness of the transparent reflective layer having a refractive index different from that of the light diffraction structure forming layer 5 may be a transparent region of the material forming the thin film, but is usually preferably 100 to 1000 mm. Examples of the method for forming the transparent reflection layer on the relief surface include thin film formation methods such as vacuum deposition, sputtering, and ion plating. The transparent reflective layer may have a refractive index larger or smaller than that of the light diffraction structure forming layer, but the refractive index difference is preferably 0.3 or more, and the difference is 0.5 or more, and further 1.0. More preferably.
[0037]
The heat-sensitive adhesive layer 7 is made of, for example, ethylene-vinyl acetate copolymer resin, polyamide resin, polyester resin, polyethylene resin, ethylene-isobutyl acrylate copolymer resin, butyral resin, polyvinyl acetate and its copolymer resin, chloride Vinyl / vinyl acetate copolymer resins, cellulose derivatives, polymethyl methacrylate resins, polyvinyl ether resins, polyurethane resins, polycarbonate resins, polypropylene resins, epoxy resins, or phenol resins can be used. Alternatively, a thermoplastic elastomer such as SBS (styrene-butadiene-styrene block copolymer), SIS (styrene-isoprene-styrene block copolymer), SEBS (styrene-ethylene-butylene-styrene block copolymer), or a reactive hot melt resin is used. Use to configure. The thickness of the heat-sensitive adhesive layer 7 is preferably 1 μm to 10 μm.
[0038]
Characters and images may be formed on the heat-sensitive adhesive layer 7 by transfer using a transfer ribbon such as a sublimation transfer ribbon and a thermal head. In this case, the transfer ribbon and the heat-sensitive adhesive layer 7 are heat-sealed. In order to avoid this, a release agent such as silicone oil or silicone resin may be added to the heat-sensitive adhesive layer 7.
In addition, when characters and images are formed on the heat-sensitive adhesive layer 7 in this way, after application to the adherend, another layer, preferably a light diffractive structure, is formed on the heat-sensitive adhesive layer 7 having the characters and images. Since it covers, the advantage that it becomes difficult to tamper with characters and images occurs.
[0039]
The intermediate layer 8 is a layer provided between the release layer 3 and the transfer layer 4, and is a layer for firmly bonding the release layer 3 and the transfer layer 4.
Since the release layer 3 has a property that suppresses the adhesive force with the base sheet 2, the adhesive force between the release layer 3 and the transfer layer 4 tends to decrease. It is configured using a mixture of the component resin constituting the layer 3 and the component resin constituting the transfer layer 4, or a functional group capable of reacting with the resin constituting each of the release layer 3 and the transfer layer 4. It is preferable to use a resin having good wettability to the surface, such as a urethane resin, and a primer layer forming material can be used. In addition to the urethane resin, an epoxy resin can also be used.
[0040]
The primer layer 9 is provided between the lowermost heat-sensitive adhesive layer 7 of the reflective layer and the light reflective layer 6 constituting the light diffraction structure, and the light reflective layer 6 is made of metal or metal oxide. In some cases, this compensates for the possibility of poor adhesion.
The primer layer 9 can be configured using a resin selected in consideration of the materials of the heat-sensitive adhesive layer 7 and the light reflective layer 6, but a resin having good wettability to the surface, such as a urethane resin, is used. It is good to use.
[0041]
Examples of the ultraviolet absorber that can be blended in the light diffraction structure forming layer 5 or the intermediate layer 8 include (1) benzophenone series, (2) benzotriazole series, (3) acrylate series, (4) salicylate series, or (5) oxanilide. In addition to the system, (6) hindered amines can be used.
[0042]
When using the sticking sheet 1 of the present invention, as shown in FIG. 2A, the sticking sheet 1 is placed on the adherend 12 such that the transfer layer 4 side is on the adherend 12 side. The sheet 1 for adhesion is bonded on the adherend 12 by being heated and pressed by a flat plate press or a roll press.
Thereafter, the substrate sheet 2 of the sticking sheet 1 is peeled to obtain the recording medium 11 in which the transfer layer 4 and the peeling layer 3 are sequentially laminated on the adherend 2 as shown in FIG. be able to.
[0043]
FIG. 3 shows an example of the recording medium 11 that can be obtained as described above. The transfer layer 4 is laminated on the right side of the adherend 12 in the form of a card, and is slightly along the upper side. A magnetic recording layer 13 is provided on the inner side, and the card name, number, expiration date, name of the holder, and the like are formed as characters 14.
[0044]
The substrate constituting the adherend 12 is rigid and difficult to bend, and may include other recording means in addition to the light diffraction structure layer 3 described above. For example, a magnetic recording layer, characters, etc. It is preferable that it is comprised with what was excellent in the workability at the time of providing.
[0045]
Specific examples of the base material of the adherend 12 include polyvinyl chloride, polyester, polycarbonate, polyamide, polyimide, cellulose diacetate, cellulose triacetate, polystyrene, acrylic, polypropylene, polyethylene, and other resins, aluminum, A metal such as copper, paper, and an impregnated paper such as resin or latex can be used alone, or a composite sheet or the like can be used.
When heat resistance is required, a sheet such as an amorphous polyester resin, a blend resin of an amorphous polyester resin and a polycarbonate resin, or the like can be used as a base material.
[0046]
Although the thickness of the base material of the adherend 12 varies depending on the material, it is usually in the range of about 10 μm to 5 mm. When the adherend 12 is a magnetic card, the thickness is 0.76 mm when the base material conforms to the ISO standard. When the substrate is formed of polyvinyl chloride (hereinafter referred to as PVC), usually, a white PVC sheet having a thickness of 280 μm is used as a core sheet, and two sheets are laminated, and transparent PVC sheets having a thickness of 100 μm are respectively formed on both sides thereof. A four-layer base material sheet (total thickness 0.76 mm) that is stacked as an oversheet and laminated by hot pressing or the like is used.
[0047]
The magnetic recording layer 13 is usually in the form of a stripe having a width of about 5 to 10 mm, and a magnetic paint prepared by adding (1) a substance containing magnetic agent powder to the surface of the substrate 2 and kneading. (2) applied to a substrate such as another thin plastic sheet, cut into a stripe shape and pasted on the substrate, or (3) another temporary The magnetic recording layer transfer sheet prepared by being detachably laminated on the base material was transferred onto the base material by a transfer method.
[0048]
The magnetic recording layer 13 is formed as a thin film of a magnetic material in a gas phase by vapor deposition or sputtering of the magnetic material, or the formation of the thin film is different from the base material of the magnetic recording medium. It may be applied to the base material after that, and then cut and pasted into a stripe shape or applied by transfer.
[0049]
In general recording media including cards, the magnetic recording layer 13 is usually provided. The magnetic recording layer 13 may be replaced with an optical recording layer, an IC module, or the like. However, even if an optical recording layer or an IC module is provided, it is preferable to provide a versatile magnetic recording layer 13.
[0050]
The characters 14 are used to indicate the name of the card issuing company, the name of the card, the card issue number, the expiration date, the name of the person holding the card, and a cautionary note. Of these, the card issue number, the expiration date, and the name of the person holding the card are often formed by unevenness by embossing.
In addition to the characters 14, the base material 2 of the adherend 12 may be colored or decorated to decorate the card. Characters that are not colored or embossed Is usually formed by printing.
[0051]
The present invention is not limited to the card as described above, and the recording medium 11 of the present invention can be used in accordance with various applications.
The recording medium 11 may be an ID (identity confirmation) card. Specifically, the ID card may be a bank saving deposit card, a credit card, an identification card, or the like. An admission ticket, passport, etc., which are not necessarily cards, may be used.
The recording medium 11 can be a bill, a gift certificate, a stock certificate, a securities, a bankbook, a boarding ticket, an air ticket, or the like. It can be a prepaid card for transportation or public telephones. Information such as the amount of money is recorded on these recording media.
[0052]
The present invention may be used to prove the authenticity of expensive items. Typical examples are high-class wristwatches, precious metals, jewelry, and other world-renowned high-class products called so-called brand goods, and their storage boxes and cases. These can be obtained by applying an adhesive sheet to the adherend 12. What has been obtained can be a recording medium.
An adhesive sheet can be applied to a storage medium such as a magnetic recording medium in which music software, video software, computer software, game software, or the like is recorded, or a case thereof. .
[0053]
【Example】
(Example 1)
Each layer was sequentially formed using a polyethylene terephthalate resin film having a thickness of 25 μm as a sheet for pasting.
First, a hologram forming layer made of a cured product of an ultraviolet curable resin having a thickness of 2 μm is formed on one side using a composition for forming a release layer, which will be described later. ₂ Each layer of a reflective layer made of a thin film, a urethane resin primer layer having a thickness of 0.5 μm, and a thermosensitive adhesive layer of vinyl chloride / vinyl acetate copolymer resin system having a thickness of 2 μm and containing 0.1% silicone oil, Sequentially formed, peel layer thickness difference and TiO ₂ Four types of affixing sheets obtained by combining the differences in the thickness of the thin film were obtained.
Here, the release layer has a thickness of 1 μm, a thickness of 1.5 μm, and a thickness of 2.0 μm. ₂ Thin films having a thickness of 40 nm and 80 nm were formed, respectively.
[0054]
The hologram forming layer was formed by pressing the metal mold to form the projections and depressions on the hologram, and then curing the layer by irradiating with 500 mJ ultraviolet rays, and then forming the reflection layer on the surface on which the projections and depressions were formed.
Each layer was formed by gravure coating except that the reflective layer was formed by vapor deposition. “Part” and “%” are both based on mass.
(Composition for peeling layer formation)
・ Methyl methacrylate resin 8 parts
・ Phenol antioxidant 0.0007 parts
(Asahi Denka Kogyo Co., Ltd., ADK STAB AO-50, for methyl methacrylate resin)
・ Vinyl chloride / vinyl acetate copolymer resin 5 parts
-Stabilizer for vinyl chloride resin 0.005 parts
(Asahi Denka Kogyo Co., Ltd., ADK STAB AC-212)
・ Nitrocellulose resin 1 part
・ Epoxy component stabilizer 0.0003 parts
(Adeka Sizer O-130P, manufactured by Asahi Denka Kogyo Co., Ltd.)
・ 0.5 parts of polyester resin
・ Light stabilizer 0.003 parts
(Asahi Denka Kogyo Co., Ltd., ADK STAB LA-32, as a stabilizer for the entire release layer)
・ Solvent (methyl ethyl ketone / toluene = 1/1) 50 parts
[0055]
After forming an image with a thermal printer using a sublimation transfer ribbon on each of the four adhesive sheets obtained, the adhesive sheet was placed on a vinyl chloride resin card. The results were as follows. The layers were laminated so that the layer side faced the card side, the adhesive sheet and the card were bonded using a thermal laminator, and the polyethylene terephthalate resin film of the substrate was peeled off after bonding.
[0056]
(1) Release layer thickness: 1 μm, TiO ₂ Thin film thickness: 40 nm
(2) Release layer thickness: 1 μm, TiO ₂ Thin film thickness: 80 nm
When using the above-mentioned (1) and (2) sticking sheets, it is difficult to peel the polyethylene terephthalate resin film of the base material smoothly, and the peel strength exceeds 0.5 kgf. It did not peel between the polyethylene terephthalate resin film of the base material and the release layer, but peeled between other layers, or the polyethylene terephthalate resin film of the base material was broken.
[0057]
(3) Release layer thickness: 1.5 μm, TiO ₂ Thin film thickness: 40 nm
When the sticking sheet of (3) was used, the peeling force was stable at 0.015 kgf, and smooth peeling could be performed between the polyethylene terephthalate resin film of the base material and the peeling layer.
(4) Release layer thickness: 1.5 μm, TiO ₂ Thin film thickness: 80 nm
When the sheet for pasting of (4) was used, the peel strength was 0.022 kgf, which was still quite large, but the base polyethylene terephthalate resin film could be peeled off almost smoothly.
(5) Release layer thickness: 2.0 μm, TiO ₂ Thin film thickness: 40 nm
The peeling force was 0.058 kgf, and smooth peeling could be performed between the polyethylene terephthalate resin film as the base material and the peeling layer.
(6) Release layer thickness: 2.0 μm, TiO ₂ Thin film thickness: 80 nm
The thickness of the release layer is 2.0 μm, TiO ₂ When the thickness of the thin film is 40 nm, the peel force is 0.010 kgf, which is a little larger, but compared to the above (4), the peel between the polyethylene terephthalate resin film of the base material and the peel layer can be performed more smoothly. It was.
[0058]
【The invention's effect】
According to the invention of claim 1, Peeling Since the thickness of the delamination is defined, the durability after application to the adherend is high, and the base sheet can be smoothly peeled off after pasting. Also, A light diffraction structure consisting of a light diffraction structure layer and a light reflective layer can be applied to the surface of the adherend, and the substrate sheet can be smoothly peeled off after application. Oh, and more Since the light diffraction structure layer is made of a cured product of an ultraviolet curable resin and contains an ultraviolet absorber, it has durability due to being a cured product, and contains an ultraviolet absorber, so that ultraviolet rays can be obtained. It is possible to provide a sticking sheet that can peel off a base material sheet that can be applied to the surface of the adherend with a light diffraction structure that is less likely to be deteriorated by receiving. Moreover, if an ultraviolet-ray is irradiated from the opposite side to a base material sheet | seat at the time of manufacture, it is possible to eliminate the bad influence on a peeling layer. Furthermore, Since the heat-sensitive adhesive layer containing a release agent is laminated on the light-reflective layer, transfer using a transfer ribbon and a thermal head or the like is enabled on the heat-sensitive adhesive layer, light Since the primer layer is laminated between the reflective layer and the heat-sensitive adhesive layer containing the release agent, the adhesive force between the light reflective layer and the heat-sensitive adhesive layer is enhanced, Peeling Since it has an intermediate layer between the release layer, the adhesion between the transfer layer and the release layer is enhanced, During ~ Since the interlayer contains a UV absorber, if the UV light is irradiated from the opposite side to the base sheet at the time of manufacture, it is possible to eliminate the adverse effect on the release layer, and the base sheet can be peeled off Sheet Manufacturing method Can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a sticking sheet.
FIG. 2 is a cross-sectional view showing a state in which a sticking sheet is applied to an adherend.
FIG. 3 is a diagram showing a card-like recording medium obtained by using a sticking sheet.
[Explanation of symbols]
1 Sheet for pasting
2 Base sheet
3 Release layer
4 Transfer layer
5 Light diffraction structure forming layer (5a; unevenness)
6 Light reflective layer
7 Heat-sensitive adhesive layer
8 Middle class
9 Primer layer
11 Recording media
12 Substrate
13 Magnetic recording layer
14 characters

Claims (1)

Substrate sheet, a release layer, an intermediate layer, the light-diffractive structure layer, light-reflecting layer, a primer layer, and adhered method of manufacturing a marked sheet capable of peeling off the substrate sheet that consists of the heat-sensitive adhesive layer,
(1) A release layer forming step of forming the release layer having a thickness of 1.5 μm or more on the base sheet surface ,
(2) An intermediate layer forming step of forming the intermediate layer containing an ultraviolet absorber on the release layer surface,
(3) An uncured optical diffraction structure forming layer forming step of forming an uncured optical diffraction structure forming layer made of an ionizing radiation curable resin on the intermediate layer surface, including an ultraviolet absorber ;
(4) Forming the relief hologram or diffraction grating fine irregularities on the surface of the light diffraction structure forming layer, irradiating ultraviolet rays from the opposite side of the substrate sheet, curing the ionizing radiation curable resin, An optical diffraction structure layer forming step having fine irregularities to form an optical diffraction structure layer having,
(5) a light reflecting layer forming step of forming the transparent light reflecting layer by a vapor deposition method on the fine uneven surface of the light diffraction structure layer;
(6) A primer layer forming step for forming the primer layer on the light reflecting layer surface,
(7) A method for producing an adhesive sheet capable of peeling a base sheet, comprising: a heat-sensitive adhesive layer forming step for forming the heat-sensitive adhesive layer containing a release agent on the primer layer surface. .

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