JP5060058B2 - Protective sheet for information display surface and method for manufacturing protective sheet - Google Patents

Description

  The present invention relates to a protective sheet for an information display surface comprising an adhesive elastic composition suitable mainly for protecting an information display surface of a portable terminal device such as a mobile phone and a method for producing the same.

  Note that the term “sheet” in this application is used to include “film”.

  An information display surface of various portable terminal devices, for example, an information display surface of a mobile phone, is laminated on a transparent substrate of a liquid crystal display panel. When this glass plate is damaged, it is displayed on the information display surface. While it is difficult to read information, this glass plate cannot be easily replaced even if it is scratched. Cover this glass plate with a protective member to prevent scratches, dirt, etc. Protecting from being done.

  As an example of such a protective member for a glass plate, a transparent hard protective plate with an adhesive applied to the periphery of the back surface is attached to a glass plate on an information display surface to protect (Patent Document). 1).

  In addition, as such a protective plate, a hard coat film such as acrylic or urethane is applied to the surface to prevent scratches, or an oxidation of tin oxide, zinc oxide or the like as an antireflection layer on the hard coat layer. There are metal and ITO (mixture of indium oxide and tin oxide) films.

  Further, there has been proposed one in which printing for advertising, decoration and concealment is performed so that the information display surface is bordered on one surface of the protective plate, for example, the side of the joint surface with the glass plate.

Prior art document information of the present invention includes the following.
Utility Model Registration No. 3025389

  The conventional protective plate is manufactured by cutting out a hard plate such as an acrylic resin formed to a thickness of 1 to 2 mm. Even if the hard plate as a raw material can be bent to some extent, It is not flexible enough to be wound into a continuous roll.

  For this reason, the application of the antireflection agent, the application of a hard coat material for preventing scratches, etc., is a wet film that uses a coating apparatus as long as it is a film or sheet that can be wound into a roll. Whereas it can be carried out continuously by the method or the like, the hard plate needs to be carried out individually in units of plates that have been cut into a predetermined size in advance, so that it is not possible to carry out work in an efficient continuous process.

  In addition, since this protective plate is plate-shaped, the application of the light antireflective agent and the hard coating agent by the wet method is limited to spraying, spin coating, transfer coating, etc., and the transport system in the drying process is also suspended. In addition, there is a problem that it is difficult to make the coating film thickness uniform, and the process of intermittently transferring plate-like materials individually is inefficient and inefficient in terms of yield. A roll process is desired.

  In addition, when a hard plate made of acrylic resin or the like is processed into a predetermined shape corresponding to the shape of the information display surface to be protected, it is necessary to perform it by a cutting process using a plurality of drills or the like because of its hardness. Productivity is low.

  In addition, a large amount of chip powder is generated during cutting, deteriorating the work environment, and a part of this cutting powder is attached to the protective plate to temporarily protect the protective plate at the time of shipment. The foreign matter contamination inspection becomes extremely complicated by biting into the cut end face of the film having the agent layer.

  Furthermore, the conventional protective plate is composed of a hard acrylic plate, etc. as described above, so it lacks flexibility, and there is no escape space for the blade thickness even if it is cut by punching. It is impossible or difficult to perform simultaneous cutting.

  In addition, a space is provided between the glass information display surface and the protective plate at the time of assembling the portable terminal device to the housing in order to avoid interference with the information display surface (Patent Document). 1) In order to prevent the impact applied to the protective plate, which is a hard plate, from being transmitted to the glass plate on the information display surface, it is necessary to interpose a cushioning material such as urethane foam in this space. However, it is necessary to mold such a cushioning material corresponding to the shape of the space, for example, the inner circumferential shape of the adhesive applied to the periphery of the protective plate, and this cushioning material is used for the information display surface and the protection. Adhesive tape for bonding to the back side of the plate is required, and many parts and processes are required.

  Therefore, the present invention has been made to solve the above-described disadvantages of the prior art, and the information display surface is not protected by a protective plate that is a hard plate, but is stress-relieved in a film having a viscoelastic layer. By protecting according to the characteristics, it is possible to reduce the number of parts without separately providing cushioning materials, etc., to enable production in a continuous process, and to improve the information display surface of a normal portable terminal device or the like. It aims at providing the protection sheet of an information display surface which can ensure sufficient intensity | strength in the use of protection, and the manufacturing method of the said protection sheet.

In order to achieve the above object, the protective sheet for the information display surface of the present invention is:
A protective member for covering the information display surface,
It consists of a polyester resin film with a thickness of 10 to 300 μm and a light transmittance of 90% or more. It has a release layer on one side and is laminated between a gas barrier film and a cover film that has gas barrier properties. and was the state of the monomers of acrylic acids and / or oligomers in UV cross-linked acrylic resin material whose main component is irradiated with ultraviolet obtained by crosslinking, thickness 200～1500Myuemu, light transmittance elongation 50-350% 80% or more adhesive elastic composition,
Said cover film is Ri formed is polymerized adhesive, and the gas barrier film is characterized wound into formed Rukoto into a roll in a state of being removed (claim 1).

  In the protective film having the above-described configuration, the adhesive elastic body composition has a rubber hardness of 20 to 90 degrees, preferably 30 to 70 degrees with respect to a thickness of 6 mm, and 2 to 15 times in the vertical and horizontal directions. Preferably, it has an elongation of 2 to 11 times, more preferably 3 to 8 times (claim 2).

  Further, the adhesive strength of the adhesive elastic body composition is preferably 200 to 1500 μm in thickness and 100 to 3000 g (1 to 30 N) / 25 mm width to 4000 g (40 N) / 25 mm width or less (claim 3). .

Further, the adhesive elastic composition may be laminated to increase the thickness (multiple layers) (claim 4 ),
The cover film may be provided with a light-reflection preventing layer made of metal oxide and a hard coat layer having a hardness of 2 to 8H (Claim 5 ).
In addition, the polyester-based resin film may be printed with decorative or bordering on one side, and the hard coat layer having a thickness of 0.5 to 2 μm and a hardness of 2H may be provided on the other side.

Further, the manufacturing method of the protective sheet of the present invention is a protective member for covering the information display surface,
UV-crosslinking type mainly composed of monomers and / or oligomers of acrylic acid between a gas barrier film and a gas barrier film consisting of a polyester resin film with a thickness of 10-300μm and light transmittance of 90% or more the Rukoto crosslinked by irradiation with ultraviolet light while blocking oxygen by laminating an acrylic resin material, the thickness 200～1500Myuemu, the light transmittance of 80% or more adhesive elastic composition polymerized adhered to the cover film ,
After the gas barrier film is removed, the film is wound into a roll .

As the method, the cover film is made to have a gas barrier property, and the ultraviolet crosslinkable acrylic resin material is laminated on the cover film, and then the laminated surface of the ultraviolet crosslinkable acrylic resin material with the cover film. laminating the gas barrier-safe Irumu on the opposite side to obtain a laminate film and, the acrylic resin material obtained the laminated film may be crosslinked by irradiation with ultraviolet rays (claim 8).

Further, as another method, the gas barrier over stacked off Irumu the UV cross-linked acrylic resin material, then the side opposite to the laminated surface of the gas barrier-safe Irumu of the ultraviolet crosslinked acrylic resin material the surface, laminating a pre SL cover film to obtain a laminated film, the acrylic resin material obtained the laminated film may be crosslinked by irradiation with ultraviolet rays (claim 9).

  According to the protective sheet for the information display surface and the manufacturing method thereof of the present invention, it has a transparency of not less than 80% which is the same as that of the conventional hard acrylic protective plate, but it can be easily cut into a blade shape (Thomson blade shape). Easily punched with a punching machine, etc., no cutting burr was observed, and it can be rolled up into a roll shape so that it can be continuously processed in a long state, making it easy to process. High productivity was obtained.

  On the other hand, the glass plate of the information display surface which is a protection target could be suitably protected by the stress relaxation property of the adhesive elastic body composition.

  The adhesive elastic composition layer formed to a predetermined thickness accepts the thickness of the blade and deforms it to create a clearance area for the blade thickness, so that it can be cut by punching with a big blade die or the like with few burrs. became.

  On the other hand, the dimensional stability, surface smoothness, etc. of the protective sheet could be complemented by the hardness of the cover film, which is a polyester resin film such as a PET film.

  In the protective sheet of the present invention, not only the surface smoothness can be stabilized by polymerizing and bonding a film having excellent dimensional stability (cover film, gas barrier film, etc.) to one or both sides of the adhesive elastic composition. 、 Punching workability that cannot be obtained with solid board such as hard acrylic board was obtained.

  Since the adhesive elastic body composition has adhesiveness, it can be directly attached to a casing of a mobile phone or the like and a glass display board, and it is not necessary to separately provide a double-sided tape or the like for attaching the adhesive elastic body composition.

  In addition, since it can be directly adhered to a glass plate or the like on the information display surface, a resin foam that also serves as a dustproof material between the glass display plate and the protective member (protective plate) as described in the prior art. It is not necessary to interpose a cushioning material such as a double-sided adhesive tape for attaching the cushioning material, and a process for punching the cushioning material into a predetermined shape is not required. It is possible to reduce the number of parts, reduce the number of materials, reduce the number of processes, and provide an information display screen protection sheet that can be manufactured at a relatively low cost.

Etc. performing ultraviolet irradiation to UV cross-linked acrylic resin material in a state covered with gas Subariya film, by performing in blocked state of oxygen to inhibit crosslinking, suitably crosslinked without being inhibited by oxygen I was able to do it.

  By applying UV crosslinkable acrylic resin material to the cover film, or by using the cover film also as the gas barrier film described above, it is possible to easily create a state in which oxygen is cut off during UV irradiation. In addition, a protective film could be obtained without separately providing a polymerization adhesion step between the adhesive elastic body composition and the cover film.

  Next, an embodiment of the protective sheet for the information display surface of the present invention will be described below.

  The protective sheet for the information display surface of the present invention comprises a pressure-sensitive adhesive elastic composition having a thickness of 200 to 1500 μm made of an ultraviolet-crosslinking acrylic resin material having a light transmittance of 80% or more, and this adhesive elastic material composition. It has a structure in which a cover film made of a polyester resin film having a light transmittance of 90% or more and a thickness of 10 to 300 μm is laminated (see FIG. 1).

[Adhesive elastic composition]
The adhesive elastic body composition constituting the protective sheet of the present invention is an adhesive composition obtained by irradiating an ultraviolet-crosslinking acrylic resin material mainly composed of monomers and / or oligomers of acrylic acid with ultraviolet rays and crosslinking. It is a composition provided with elasticity.

  The adhesive elastic body composition obtained in this way has high viscoelasticity, and unlike the acrylic plate used for conventional protective plates, the information display surface was protected by its hardness. This viscoelasticity protects the information display screen from impacts, etc., itself has adhesiveness to the information display surface, and can be wound up into a roll shape because of its flexibility. Processing can be performed continuously, and high productivity and high yield can be obtained.

1. Composition (1) Main Agent As the monomer and / or oligomer of the aforementioned acrylic acid as the main agent, the following can be used as an example.

  Acrylic acid, ethyl acrylate, methyl acrylate, 2-ethylhexyl acrylate, butyl acrylate, isobutyl acrylate, isononyl acrylate, dimethylaminoethyl acrylate, methoxyethyl acrylate, stearyl acrylate, isooctyl acrylate, acrylic acid N -Octyl, 2-hydroxyethyl acrylate, hydroxypropyl acrylate, methyl methacrylate, butyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, cyclohexyl methacrylate, trimethylolpropane trimethacrylate, tertiary butyl methacrylate, etc. It is.

  These main agents may be used in combination of two or more thereof.

(2) Auxiliary materials In addition to the above-mentioned monomers and / or oligomers of the acrylic acid as the main component, the ultraviolet-crosslinking acrylic resin material that becomes the above-mentioned adhesive elastic body composition upon irradiation with ultraviolet rays includes an ultraviolet crosslinking initiator, ultraviolet rays A crosslinking accelerator (sensitizer) is blended.

  Other auxiliary materials may include fillers, such as inorganic metal fillers as anti-reflective agents, vinyl acetate for the purpose of modifying hardness and adhesion, styrene, Mixing tackifiers (tackifiers) is no problem. However, in the present invention in which the thickness of the adhesive elastic body composition is formed to 200 to 1500 μm, it is not preferable in that light birefringence occurs in the Z direction (thickness direction), and the light reflection characteristics change to lower the transparency. Inorganic metal fillers, vinyl acetate, styrene, and tackifiers are also not preferred.

  On the other hand, organic fillers can be added for dimensional stability and hardness adjustment. From the viewpoint of affinity and transparency with UV-crosslinked acrylic resin materials, such fillers are acrylic resin fillers. And the like are more preferable.

2. Manufacturing method (1) Application to film An acrylic resin material containing the above-mentioned acrylic acid monomers and / or oligomers as a main component and blended with an ultraviolet crosslinking initiator, an ultraviolet crosslinking accelerator and the filler described above, an extruder, a die coater Extrude by etc. and laminate on a film such as PET film.

Cover The aforementioned film for laminating an acrylic resin material, may be performed directly on the cover film to be described later, or, the coated acrylic resin material casting paper (step film), section later before UV irradiation You may stick a film together.

  The thickness of the extruded acrylic resin material may be adjusted by an extrusion die of the extruder, or by a comma coater, a reverse coater, a knife coater, etc. From the viewpoint of preventing adhesion and entrainment, adjustment with an extrusion die is preferable.

  The above-mentioned film to which the acrylic resin material is applied is not particularly limited, but it is preferable to use a film having smoothness and dimensional stability in order to make the quality of the obtained adhesive elastic body composition constant.

Further, since also serving as a gas barrier film described in the ultraviolet irradiation step later in the film to be used here, a film having gas barrier properties, preferably used which has a UV transparent.

  As an example, it is preferable to use a biaxially stretched PET film because of gas barrier properties, surface smoothness, and dimensional stability, but an olefin film such as polypropylene may be used.

  As an example, the thickness of the film is 10 to 250 μm, and the thickness is preferably 50 to 120 μm from the viewpoint of process resistance and surface strain resistance.

  When the process film used for the application of acrylic resin material is removed later, it is desirable that one side or both sides should be provided with a release property. It is preferable to use a film coated with.

  The peelability may be imparted only on one side, but it is preferable to perform a release treatment with silicone or the like on both sides in consideration of winding in a roll shape.

(2) Ultraviolet irradiation step The acrylic resin material coated on the film as described above is crosslinked by irradiation with ultraviolet rays to obtain an adhesive elastic body composition having adhesiveness and elasticity.

UV irradiation step, the oxygen of the atmosphere to inhibit crosslinking, for preventing oxidation, carried out in a state of covering the surfaces of an acryl-based resin material film having gas Subariya properties.

  When a film having a gas barrier property is used as a film on which the acrylic resin material is laminated, the surface of the acrylic resin material on the side opposite to the bonding surface with the film is also used. A gas barrier film is attached in advance before the ultraviolet irradiation.

This gas barrier film includes olefin-based films such as PE and PP, PET film, and paper-resin laminate as long as the oxygen permeability is 10000cc / cm ² .24h at 20 ° C and 90% RH "JIS-K-7126" or lower. Either coated paper or the like may be used, and the material is not limited. However, it is preferable to use a stretched PET film because of the heat ray compatibility of the ultraviolet lamp, gas barrier properties, and smoothness of the finished surface.

  In addition, when ultraviolet irradiation is performed from the gas barrier film side, a gas barrier film having ultraviolet transparency is used.

In the present invention, also serves as the gas barrier film with a cover film, which will be described later, the film stuck here in addition to the gas barrier property, to use to satisfy the performance required as a cover film.

  Although the thickness of the gas barrier film can be adjusted to 5 μm, it is preferably 12 μm or more from the tear resistance.

  When the obtained adhesive elastic body composition is wound into a roll after UV irradiation, when both the process film and the gas barrier film described above are wound in a roll, It is preferable to peel off either the process film or the gas barrier film (if either one also serves as a cover film described later) after ultraviolet irradiation, since galling (皺) occurs due to the difference in circumference diameter. In consideration of peeling in this way, a release agent such as silicone is applied to the application surface of the acrylic resin material for the process film or gas barrier film to be peeled here. Is preferred.

  In this case, after the film on the side to be left without being peeled is similarly wound on the surface on the side opposite to the joint surface with the adhesive elastic body composition, When it is developed again, the peelability from the adhesive elastic body composition can be improved.

[Cover film]
A cover film comprises the protective sheet of this invention with the adhesive elastic composition obtained as mentioned above, and is comprised by the polyester-type resin film.

  The polyester resin film used as the cover film is preferably a biaxially stretched polyester film in terms of dimensional stability, transparency and hardness. In this embodiment, biaxially stretched PET is used as an example. It was used.

  The thickness of the polyester film used as the cover film is in the range of 10 to 300 μm, and is 50 to 200 μm, more preferably 100 to 200 μm, from the viewpoint of hardness and cutting workability.

The cover film can be provided with an antireflection layer. In this case, a film of ITO, SiO ₂ , TiO ₂ , ZnO ₂ or the like is formed on one side of the polyester film as an antireflection agent.

  Such a film may be formed, for example, by sputtering ITO or the like. When the light reflection preventing layer is formed by this method, a highly reliable film such as transparency can be obtained.

On the other hand, formation of a metal film by sputtering has difficulty in depreciation cost, primer treatment, and productivity. Therefore, as a preferable method in terms of cost, for example, ITO, SiO ₂ , TiO ₂ , ZnO ₂ is acrylic or acrylic. A resin binder may be added to form a solution or an emulsion, and this may be applied to a polyester film using a gravure coater, a spin coater, or the like to form the metal film, which may be used as an antireflection layer.

The particle size of ITO, SiO ₂ , TiO ₂ , ZnO _{2 and the} like used as an antireflection agent in the wet method is preferably as fine as possible from the viewpoint of transparency, and is preferably 10 to 500 nm. In this case, since the yield is deteriorated due to poor dispersibility and secondary aggregation, particles having a particle diameter of about 1 μm may be used.

  The above-described antireflection layer may be formed on any surface of the polyester film [FIG. 2 (A), FIG. 3 (A), FIG. 4 (A)], the surface side of the polyester film. When it is provided on the upper surface of the hard coat layer, which will be described later, it may be provided between the hard coat layer and the biaxially stretched polyester film [FIG. 2 (A), FIG. 3 (A)]. Of course, since the light-coating efficiency is formed by the wet method as described above, the hard coat layer also functions as a primer for the light-reflection preventive layer. It is preferable to form [FIG. 2 (A)]. The lower side in the figure is the polymerization side with the adhesive elastic body composition (the same applies hereinafter).

  On the contrary, from the viewpoint of protecting the light reflection preventing layer, it is preferable to form the light reflection preventing layer on the surface to be polymerized with the adhesive elastic composition [FIG. 4A], and the information display surface to be protected. It is good also as what selects a formation position according to the kind, the purpose of sticking a protection sheet, etc.

  As the hard coat agent for the hard coat layer, use one with a hardness of 4H or higher in consideration of scratch resistance. Since the finish of the hard coat depends on the hardness of the support such as PET film, if the finish is more than 2H, select the above range. As an example, it is preferable to apply a known hard coating agent such as urethane type or acrylic type in a range of 0.1 to 4 μm in solid content and 0.5 to 2 μm from prevention of refractive distortion by a gravure coater, kiss coater (Meyer bar) or the like. If it is thin, the protective effect is weak, and if it is too thick, refractive distortion will occur, causing a reduction in visibility.

  For decorative and border printing, it is preferable to prevent contamination of ink pigments after forming a hard coat, or after applying a light-reflective layer, and print on this upper surface [FIG. 2 (B), FIG. 3 (B), FIG. 4 (B)], or printing on the back side of the polyester film [FIG. 2 (C), FIG. 3 (C), FIG. 4 (C)].

In addition, a silicone as a release agent is further applied to the upper surface of the hard coat described above (on the antireflective film or printed layer when an antireflective film and / or printed layer is formed on the hard coat). Contact Ku [FIG 2 (D) ~ (F) , FIG. 3 (D) ~ (F) , FIG. 4 (D) ~ (F) ]. By applying such a release agent, when the protective sheet of the invention is wound up in a roll shape, the subsequent release property is good and convenient.

[Lamination of adhesive elastic composition and cover film]
The cover film obtained as described above may be bonded to the adhesive elastic body composition obtained as described above when punching or the like to obtain the protective sheet of the present invention. As described above, the cover film described above is manufactured in advance, and this cover film is used as the process film or gas barrier film described in the above-described method for manufacturing the adhesive elastic body composition. It is not necessary to separately provide a polymerization adhesion step with the body composition, which is preferable from the viewpoint of reducing the number of manufacturing steps.

[Action etc.]
The protective sheet of the present invention obtained as described above is cut into a shape of an information display surface to be protected by cutting it by punching or the like.

  Since the adhesive elastic composition has adhesive properties, it can be directly applied to a glass plate or the like on the information display surface, and a double-sided adhesive tape is unnecessary, reducing the number of processes and saving resources.

  Since the protective sheet of the present invention has a structure mainly composed of an adhesive elastic body composition that is a viscous body, punching can be employed when processing into the shape of the information display surface to be protected. No dust is generated when molding protective plates made of acrylic plates, etc., and molding with low depreciation and high productivity is possible.

  In addition, since the adhesive elastic composition constituting the main body of the protective sheet of the present invention is a soft viscous material, the information display surface has good followability with respect to the surface of the display plate, and between the display plate and dustproof and stress relaxation. Therefore, it is not necessary to provide a separate foam or the like, and a double-sided tape or the like for attaching the foam or the like is not necessary, and the number of parts can be further reduced.

  Next, the manufacture example of the protection sheet of this invention is shown below.

[Production Example of Adhesive Elastic Composition]

Visual observation evaluation method Evaluation of punchability with a big-blade punching machine (the shape is reproduced and there is no flow of the adhesive elastic composition)
○: Good, △: Slightly deformed, ×: Deformed burr foreign material (no burrs on the cut section and no generation)
○: No occurrence, Δ: Slight occurrence, × Many burrs Note that, depending on the configuration of PET film 188 μm / acrylic elastic body / protective PET thickness 25 μm film.

  The protective sheet of the present invention described above can be easily attached to information display surfaces provided on various devices such as mobile phones, PDAs, personal computer liquid crystal screens, touch panels, etc., and used for their protection and decoration. Can do.

The schematic explanatory drawing of the protection sheet of this invention. It is a schematic explanatory drawing of the cover film used for the protective sheet of this invention, (A)-(F) shows the example of a change of a layer structure, respectively. It is a schematic explanatory drawing of another cover film used for the protective sheet of this invention, (A)-(F) shows the example of a change of a layer structure, respectively. It is a schematic explanatory drawing of another cover film used for the protection sheet of this invention, (A)-(F) shows the example of a change of a layer structure, respectively.

Claims (9)

A protective member for covering the information display surface,
It consists of a polyester resin film with a thickness of 10 to 300 μm and a light transmittance of 90% or more. It has a release layer on one side and is laminated between a gas barrier film and a cover film that has gas barrier properties. and was the state of the monomers of acrylic acids and / or oligomers in UV cross-linked acrylic resin material whose main component is irradiated with ultraviolet obtained by crosslinking, thickness 200～1500Myuemu, light transmittance elongation 50-350% 80% or more of the pressure-sensitive elastic composition, the Ri formed by the cover film is polymerized adhesive, and the protective sheet of the gas barrier film is formed Ru information display screen is wound into a roll in a state of being removed .   The protective sheet for an information display surface according to claim 1, wherein the adhesive elastic body composition has a hardness of 20 to 90 degrees with respect to a thickness of 6 mm and has an elongation of 2 to 15 times in the vertical and horizontal directions. .   3. The information display surface according to claim 1, wherein the adhesive strength of the adhesive elastic body composition is 200 to 1500 μm in thickness and 100 to 3000 g (1 to 30 N) / 25 mm width to 4000 g (40 N) / 25 mm width or less. Protection sheet. The protective sheet for an information display surface according to any one of claims 1 to 3, wherein the adhesive elastic composition is laminated in plural layers. The cover film is provided with a light reflection preventing layer by the metal oxide, the protective sheet of claim 1 the information display screen of any one of claims, characterized in that it comprises a hard coat layer hardness 2～8H. The polyester-based resin film is provided with a decorative or edging print on one surface, and includes the hard coat layer having a thickness of 0.5 to 2 µm and a hardness of 2H on the other surface. The protective sheet for the information display surface according to claim 1.
A protective member for covering the information display surface,
A polyester resin film having a thickness of 10 to 300 μm and a light transmittance of 90% or more, having a release layer on one side and having a gas barrier property, and a gas barrier film, a monomer of acrylic acid and / or the Rukoto oligomer ultraviolet irradiation to crosslink the while blocking oxygen by laminating an ultraviolet-crosslinking acrylic resin material whose main agent, the thickness to the cover film 200～1500Myuemu, light transmittance of 80% or more adhesive an elastic body composition Polymerization adhesive,
A method for producing a protective sheet, comprising removing the gas barrier film and then winding it into a roll . The cover film has a gas barrier property, and the UV cross-linked acrylic resin material is laminated on the cover film.
Then, to obtain a laminated film by laminating the gas barrier-safe Irumu the surface opposite to the laminated surface of the cover film of the ultraviolet crosslinked acrylic resin material,
The method for producing a protective sheet according to claim 7, wherein the acrylic resin material of the obtained laminated film is crosslinked by irradiation with ultraviolet rays. The UV cross-linked acrylic resin material is laminated on the gas barrier-safe Irumu,
Then, the surface opposite to the laminated surface of the gas barrier-safe Irumu of the ultraviolet crosslinked acrylic resin material, to obtain a laminated film by laminating a pre-Symbol cover film,
The method for producing a protective sheet according to claim 7, wherein the acrylic resin material of the obtained laminated film is crosslinked by irradiation with ultraviolet rays.

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