JP2014040076A - Production method of icon sheet, icon sheet and touch panel using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an icon sheet and a touch panel using the sheet which has little optical distortion caused by a level difference in a print and little residual bubbles and which is hardly dented even when a load is applied.SOLUTION: A production method of an icon sheet having a print layer and an adhesive layer on one surface of a hard coat film is carried out by using a hard coat film having a hard coat layer formed on one surface or both surfaces of a substrate. The method comprises: forming a print layer comprising a frame and/or an icon by printing on one surface of the hard coat film; then applying a photosetting resin composition having fluidity and a photosetting adhesive composition having fluidity to form a two-layer liquid layer on the surface of the hard coat film where the print layer is formed and a part where the print layer is not applied and the print layer; then irradiating the liquid layer with light to simultaneously form a cured resin layer and an adhesive layer.

Description

The present invention relates to a method for producing an icon sheet having a print layer and an adhesive layer on one side of a hard coat film, an icon sheet obtained thereby, and a touch panel using the icon sheet.
In addition, the printing level | step difference in this specification is the thickness of the printing layer from the surface of a base material in the state in which the printing layer of the black frame and / or the icon was formed in the surface of the base material consisting of a transparent resin film. Point to.
Further, in the present specification, a hard coat film having a hard coat layer on one side of a transparent resin film and having a black frame and / or icon printing layer formed on the other side is referred to as a hard coat layer, a transparent resin. It is set as the structure laminated | stacked on the upper side in order of the printing layer of a film, a black frame, and / or an icon.

  2. Description of the Related Art Conventionally, a touch panel is known in which a hard coat film on which an icon that indicates an operation method is printed is bonded to the surface of the touch panel (see, for example, Patent Documents 1 and 2).

  Examples of the display (display device) to which the touch panel is applied include a liquid crystal display (LCD), an electroluminescence display (inorganic EL, organic EL), and the like. Mobile terminals, mobile phones, electronic paper, electronic book terminals, personal computers, and the like.

  By the way, in Patent Document 1, when bonding a hard coat film on which an icon is printed with a pressure-sensitive adhesive, if the step between the printed portion of the icon and its periphery is set to 5 μm or less, the bonding is performed. The generation of air bubbles can be prevented.

  In addition, when sticking the hard coat film on which the icon indicating the operation method is printed on the surface of the touch panel, there are various ways to prevent the mixing of bubbles caused by the presence of the icon printing step. Attempts have been made (see, for example, Patent Documents 3 to 7).

  Patent Documents 8 and 9 disclose a method of manufacturing an image display panel in which a decorative layer is provided on the back surface of a transparent panel substrate that displays an image. A separator film in which a UV curable resin or a thermosetting resin is continuously filled on the inner side of the step of the decorative layer on the back surface of the panel substrate and the upper surface of the decorative layer, and then a release agent is applied on the upper surface of the cured resin. After the separator film is pressurized to the cured resin side while being coated and subjected to UV irradiation, the separator film is peeled off to produce an image display panel.

  Furthermore, for example, Patent Documents 10 to 12 disclose a technique for laminating a photo-curing resin in two layers and simultaneously curing it.

JP 2003-036143 A JP 2004-213187 A JP 2009-098324 A JP 2010-176111 A JP 2010-072471 A JP 2010-097070 A JP 2010-239324 A JP 2012-22281 A JP 2012-22210 A JP 2000-248241 A JP 2004-204090 A JP-A-1-121386

  However, in the display device described in Patent Document 3, it is necessary to add a light-transmitting member (corresponding to a hard coat film) to the surface of the touch panel via the adhesive layer and the pressure-sensitive adhesive layer. There is a problem that it cannot be adopted for an inexpensive display device because it causes an increase in cost. Further, in the display device described in Patent Document 3, a light shielding layer having a thickness of about 5 to 10 μm is formed so as to surround the outer periphery of the liquid crystal device, but in order not to be affected by the printing step of the light shielding layer, Areas of the adhesive layer and the pressure-sensitive adhesive layer are disposed.

Further, in Patent Document 4, a transparent protective plate made of an acrylic resin or a polycarbonate resin and a step between the printing portion are filled with a transparent resin to be flattened, and further a double-sided tape or a transparent adhesive is used to protect the protective plate. Is attached to the display surface.
According to Patent Document 4, the film thickness of the photocurable resin is preferably set to a film thickness that is twice or more the thickness of the printed layer. However, the planarization method performed using the photocurable resin is specifically described below. The details are not described in detail.

  Patent Document 5 discloses a surface protective layer (corresponding to a protective film) having a light shielding layer (corresponding to an icon print layer) on the surface of the touch panel via an adhesive layer having a specific storage elastic modulus. ). When this adhesive layer is used, bubbles are not generated, but after the surface protective layer is bonded to the touch panel, the adhesive is cured by irradiating the surface protective layer or the other side of the touch panel with ultraviolet rays, There was a problem that ultraviolet rays were not sufficiently irradiated to the back side of the light shielding layer.

Moreover, in patent document 6, it is equivalent to the surface transparent board (equivalent to a protective film) which has a black printing layer (equivalent to the printing layer of an icon) on the surface of a touch panel through the transparent adhesive sheet which has a specific storage elastic modulus. ).
It is assumed that foaming does not occur on the bonding surface between the liquid crystal display panel and the plastic plate (protective transparent plate). However, since a protective transparent plate made of transparent plastic is bonded to the liquid crystal panel via the transparent adhesive sheet, it is unavoidable that bubbles remain in the corner where the step difference of the black printed layer occurs. was there.

Patent Document 7 discloses that a design panel on which an external frame is formed is bonded to a touch panel via a double-sided tape.
Since the application surface of the double-sided tape is substantially flat as a whole, no bubbles are generated between the design panel and the double-sided tape. However, since the design panel is bonded to the touch panel via the double-sided tape, there is a problem that air bubbles cannot be avoided at the corner portions where the printed layer of the outer frame portion has a step.

  In addition, the image display panels disclosed in Patent Documents 8 and 9 can reduce the generation of bubbles, but the obtained panel has a problem that a depression tends to occur when a load is applied.

The inventions disclosed in Patent Documents 10 to 12 all relate to a pressure-sensitive adhesive film and a pressure-sensitive adhesive tape, and disclose that the base material and the pressure-sensitive adhesive layer are simultaneously cured. . However, in these cases, the base material layer needs to be applied thicker than the pressure-sensitive adhesive layer in order to impart stress relaxation properties to the tape. Therefore, the viscosity of the solution of the resin composition of the base material layer is required. Is higher than the viscosity of the solution of the pressure-sensitive adhesive composition.
Therefore, using the inventions disclosed in Patent Documents 10 to 12, when the upper portion of the hard coat film where the printing layer is not applied is filled with a photocurable resin composition having a high viscosity, It is inevitable that bubbles remain in the corner where the step is generated.

  The present invention has been made in view of the above circumstances, and has a method of manufacturing an icon sheet, an icon sheet, and an icon sheet that have less optical distortion due to printing steps, less bubbles, and are less likely to be depressed even when a load is applied. It is an object to provide a touch panel using the touch panel.

  In order to solve the above problems, the present invention provides a method for producing an icon sheet having a printed layer and an adhesive layer on one side of a hard coat film, wherein the hard coat layer is provided on one side or both sides of a substrate. When the hard coat film is used and a hard coat layer is formed on one side, printing is performed on the other side. When a hard coat layer is formed on both sides, printing is performed on either side. To form a printed layer consisting of a frame and / or an icon, and then on the surface of the hard coat film on which the printed layer is formed, on the upper part of the printed layer and on the printed layer. Then, after applying a photocurable resin composition having fluidity and a photocurable pressure-sensitive adhesive composition having fluidity to form two liquid layers, the resin composition and the Adhesive composition Curing the, to provide a method of manufacturing a icon sheet, characterized by simultaneously forming the formed cured resin layer and the adhesive pressure-sensitive adhesive layer formed from the composition of the resin composition.

  In the manufacturing method of the icon sheet of this invention, it is preferable that the peeling film by which the peeling process was carried out is arrange | positioned on the surface of the said adhesive layer.

  The present invention is also a method for producing an icon sheet having a printed layer and an adhesive layer on one side of a hard coat film, wherein a hard coat layer is formed on one side of a substrate and a frame is formed by printing on the other side. And / or a long roll of a hard coat film formed with a printing layer consisting of icons, or a printing consisting of a frame and / or an icon by printing on either side with a hard coating layer formed on both sides After preparing a roll body of a long hard coat film and a roll body of a long release film, in which a layer is formed, while feeding out from the long roll body of the hard coat film, A photocurable resin composition having fluidity on an upper portion of the surface on which the printed layer is formed and on the upper portion of the printed layer, and on the upper portion of the printed layer; and A step of continuously applying a photocurable pressure-sensitive adhesive composition having fluidity to form a two-layer liquid layer; the two-layer liquid layer is fed from a roll of the long release film; The resin composition and the pressure-sensitive adhesive composition are cured through a step of bonding the peeled film, a light irradiation step of irradiating light from above the release film, and a drying step, and curing formed from the resin composition. Provided is a method for producing an icon sheet, wherein a resin layer and a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition are simultaneously formed to obtain a long icon sheet.

  In addition, the present invention provides an icon sheet obtained by the icon sheet manufacturing method.

  The icon sheet of the present invention preferably has a mixed layer at the interface between the cured resin layer and the pressure-sensitive adhesive layer.

  The present invention also provides a touch panel in which the icon sheet is bonded through the pressure-sensitive adhesive layer.

  The present invention also provides an electronic device in which a touch panel is incorporated.

The method for producing an icon sheet of the present invention includes a photocurable resin having fluidity on the surface of a hard coat film on which a printed layer is formed, on an upper portion of the printed layer and on the upper portion of the printed layer. The composition and the photocurable adhesive composition having fluidity are continuously applied to form two liquid layers, and then irradiated with light to form the cured resin layer formed from the resin composition and the adhesive. Since the icon sheet is obtained by simultaneously forming the pressure-sensitive adhesive layer formed from the adhesive composition, there is little optical distortion due to the printing step, and there are few remaining bubbles, even if a load is applied. It is possible to efficiently manufacture an icon sheet that is less likely to cause dents.
Moreover, since the printing level | step difference is filled using photocurable resin, even if it applies a load to a hard-coat layer, it is hard to produce a dent in an icon sheet.
In addition, the hard coat film according to the present invention can fill a printing step regardless of the flexibility of the pressure-sensitive adhesive layer, so that it is not only a flexible pressure-sensitive adhesive layer with enhanced adhesive strength, but also a hard-removable pressure-sensitive adhesive. It is possible to use a pressure-sensitive adhesive layer having very hard physical properties that cannot transfer the layer or the pressure-sensitive adhesive layer.

  Moreover, the hard coat film of the present invention can be suitably used as an anti-scattering film used for protecting a touch panel or an icon sheet to be bonded to the ITO surface of a capacitive touch panel.

It is sectional drawing which shows an example of the icon sheet | seat of this invention.

  Hereinafter, preferred embodiments of the present invention will be described.

The method for producing an icon sheet of the present invention is a method for producing an icon sheet having a printing layer and an adhesive layer on one side of a hard coat film, and a hard coat layer is formed on one side or both sides of a substrate. When a hard coat film is used and a hard coat layer is formed on one side, a frame is printed on the other side. When a hard coat layer is formed on both sides, a frame is printed on either side. And / or a printing layer comprising icons, and then flowing on the surface of the hard coat film on which the printing layer is formed, on an upper portion of the printing layer where the printing layer is not applied, and on the upper portion of the printing layer. The resin composition and the pressure-sensitive adhesive are formed by applying a light-curable resin composition having fluidity and a liquid-curable photocurable pressure-sensitive adhesive composition to form two liquid layers and then irradiating with light. composition Curing the, characterized by simultaneously forming the formed cured resin layer and the adhesive pressure-sensitive adhesive layer formed from the composition of the resin composition.
The icon sheet manufacturing method of the present invention is a method for manufacturing an icon sheet having a printed layer and an adhesive layer on one side of a hard coat film, and forming a hard coat layer on one side of a substrate, A long roll body of a hard coat film in which a printing layer composed of a frame and / or an icon is formed on the other surface, or a hard coating layer is formed on either side and a frame is printed on either surface. And after preparing the roll body of the elongate hard coat film which formed the printing layer which consists of an icon and / or the roll body of the elongate peeling film, it pays out from the elongate roll body of the said hard coat film However, on the upper surface of the surface of the hard coat film on which the printed layer is formed, on the portion where the printed layer is not applied, and on the upper portion of the printed layer, fluidity is provided. A step of continuously applying a photocurable resin composition and a photocurable pressure-sensitive adhesive composition having fluidity to form a two-layer liquid layer, the long layer on the two liquid layers The step of pasting the release film drawn out from the roll body of the release film, the light irradiation step of irradiating light from above the release film, and the drying step, curing the resin composition and the pressure-sensitive adhesive composition, The cured resin layer formed from the resin composition and the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition are simultaneously formed to obtain a long icon sheet.

(Hard coat film)
As the hard coat film used in the method for producing an icon sheet of the present invention, a hard coat film having a hard coat layer on one or both sides of a transparent resin film serving as a substrate is used.
Examples of the transparent resin film include a polyethylene terephthalate (PET) resin film, a polyethylene terephthalate (PEN) resin film, and a cyclic polyolefin (COP) resin film. It is preferable that it is one selected. In particular, a polyethylene terephthalate (PET) resin film is suitably used because it is relatively inexpensive and has high transparency.
10-250 micrometers is preferable and, as for the thickness of a transparent resin film, 30-200 micrometers is more preferable. If the thickness of the transparent resin film is thinner than 10 μm, it is not preferable because it is not easy to handle. On the other hand, when the thickness of the transparent resin film is larger than 250 μm, the transparency is lowered, the cost is increased, and the processability in the production process of the hard coat film is deteriorated. From the above points, the thickness of the transparent resin film is preferably 10 to 250 μm, and more preferably 30 to 200 μm. In addition, for the purpose of improving the adhesion between the transparent resin film and the hard coat layer, an appropriate easily adhesive resin layer is laminated on the surface of the transparent resin film, flame treatment, corona treatment, plasma treatment, etc. A surface treatment may be applied. Moreover, you may provide a base layer between a transparent resin film and a hard-coat layer.

(Hard coat layer)
The hard coat layer formed on the transparent resin film only needs to have a hard coat property that can be used for a member that covers the surface of the touch panel. Usually, there is no practical problem if the measured value in the pencil hardness test is 2H or more. . The resin used for the hard coat layer is not particularly limited, and silicone-based and melamine-based thermosetting hard coat resins, silicone-based, acrylic-based ultraviolet curable hard coat resins, and the like can be used. In the hard coat film of the present invention, a hard coat layer is formed on one side or both sides of the transparent resin film. When a hard coat layer is formed only on one side of the transparent resin film, warping or bending due to thermal expansion is likely to occur. It is preferable to form a hard coat layer on both sides of the transparent resin film except when the price is given priority over the performance and an inexpensive hard coat film is required.
Moreover, 1-10 micrometers is preferable and, as for the thickness of a hard-coat layer, 2-8 micrometers is more preferable. If the thickness of the hard coat layer is less than 1 μm, the hard coat property cannot be obtained and the scratch resistance is lowered, and when an ultraviolet curable hard coat resin is used, poor curing tends to occur.
On the other hand, if the thickness of the hard coat layer is greater than 10 μm, cracks are likely to occur in the hard coat layer, and the hard coat film itself tends to curl, which is not preferable.
Moreover, you may add the additive for providing various functions, such as an antistatic agent and a ultraviolet absorber, to a hard-coat layer as needed. As a method for forming the hard coat layer on the surface of the transparent resin substrate, a conventionally known method such as a reverse coating method, a die coating method, or a gravure coating method can be used.
Moreover, when a printing layer and an adhesive layer are laminated | stacked on a hard-coat layer, on the surface of a hard-coat layer for the purpose of improving the adhesiveness of a hard-coat layer, a printing layer, and an adhesive layer. An appropriate easily-adhesive underlayer may be laminated, or surface treatment such as flame treatment, corona treatment, or plasma treatment may be performed.

(Black border and / or icon print layer)
The present invention relates to a method for producing an icon sheet having a printed layer and an adhesive layer on one side of a hard coat film.
In the icon sheet according to the present invention, in the black frame formed by the printing layer, illumination light emitted from a display panel (such as a backlight of a liquid crystal panel) provided behind the touch panel leaks from the periphery of the display panel. In order to suppress this, it is provided to shield the peripheral portion of the display panel. The icons formed by the print layer are frequently used among icons displayed on the touch panel screen (display of symbols, characters, symbols, etc. for inputting or selecting specific functions, operations, items, etc.). It is provided to fix and use what is used.
The black frame and / or icon is formed by the printing layer by forming a light-shielding film by applying and drying a paint composed of a resin composition containing a light-shielding black pigment by screen printing, intaglio printing, or the like. Do. As the black pigment, one or two or more selected from the group consisting of carbon black, graphite, aniline black, cyanine black, titanium black, black iron oxide, chromium oxide, and manganese oxide can be used in combination. Of these black pigments, carbon black is particularly preferably used. The preferable particle size distribution range of the black pigment (light absorbing material) is in the range of 0.01 to 0.5 μm, and more preferably in the range of 0.05 to 0.3 μm. In addition, in order to adjust the color tone of the light shielding layer to an achromatic color or a preferable color tone, a plurality of other color materials may be used as necessary. Moreover, in order to form a black frame by a printing layer, for example, an acrylic resin-based paint in which carbon black is dispersed as a black pigment is used, and a black frame is formed by setting the thickness of the printing layer to 10 to 50 μm. it can. The printed layer is not necessarily limited to black, and various colors such as glossy resin, white, and various chromatic colors can be selected.

(Photo-curable adhesive composition)
In the icon sheet manufacturing method of the present invention, the photocurable pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer is not particularly limited.
Examples of the photocurable pressure-sensitive adhesive composition include an acrylic syrup type photocurable pressure-sensitive adhesive composition containing an acrylic polymer, an acrylic monomer, and a photopolymerization initiator as essential components, or a urethane acrylate type. Urethane acrylic photo-curing type, prepared by adding a main component consisting of a polymer and / or urethane acrylate, an acrylic monomer, and a photopolymerization initiator as essential components, and adding a cross-linking agent and additives as necessary. An adhesive composition can be used.
These photocurable pressure-sensitive adhesive compositions exhibit adhesiveness during photocuring and solidify to form a pressure-sensitive adhesive layer.
Acrylic syrup type photo-curing agent pressure-sensitive adhesive composition is a urethane acryl acrylate that has a process of abruptly terminating the polymerization by cooling or introducing oxygen or volatilizing the organic solvent used during the polymerization. It is more difficult than the photocuring agent pressure-sensitive adhesive composition. Therefore, a urethane acrylic photo-curing pressure-sensitive adhesive composition is preferable.

Examples of the main agent composed of a urethane acrylate polymer and / or urethane acrylate, which are the main components of the photocurable pressure-sensitive adhesive composition, include 2 moles or more with respect to 1 mole of a compound having two or more NCO groups in one molecule. The compound which has 1 or more (meth) acryl groups in 1 molecule obtained by making the hydroxyl group containing acrylic monomer of (1) react is mentioned. Here, as the hydroxyl group-containing acrylic monomer, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono Examples include hydroxyl group-containing (meth) acrylates such as (meth) acrylate and cyclohexanedimethanol mono (meth) acrylate.
Moreover, as a compound which has a 2 or more NCO group in 1 molecule, the oligomer with the molecular weight of about 500-50000 obtained by making polyisocyanate compounds, such as diisocyanate, and polyol compounds, such as diol, react is preferable.
Examples of the polyisocyanate compound include aliphatic polyisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate, and aromatic polyisocyanates such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and phenylene diisocyanate.

Examples of the polyol compound include glycols such as ethylene glycol, propylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, and 1,4-cyclohexanedimethanol; trivalent or higher polyols such as glycerin and pentaerythritol; polyethylene glycol, polypropylene Polyether-type diols such as glycol, polytetramethylene glycol, polyhexamethylene glycol; the above diols react with dibasic acids such as phthalic acid, isophthalic acid, terephthalic acid, maleic acid, fumaric acid, adipic acid, and sebacic acid Polyester-type diols obtained in this manner.
Furthermore, in the said photocurable adhesive composition, at least 1 type of (meth) acrylate may contain in at least 1 type of urethane acrylate. Other monomers can be added as long as the effects of the present invention are not impaired. As (meth) acrylate, for example, the general formula _CH ^{2 =} CR 1 -COOR 2 (wherein, ^{R 1} is hydrogen or methyl, ^{R 2} is. Represents an alkyl group having 1 to 14 carbon atoms) alkyl represented by ( Acrylic monomers such as (meth) acrylate are raised. The alkyl (meth) acrylate represented by the general formula _CH ^{2 =} CR 1 -COOR 2, specifically, methyl (meth) acrylate, ethyl (meth) acrylate, n- propyl (meth) acrylate, isopropyl (meth ) Acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, t-butyl (meth) acrylate, n-pentyl (meth) acrylate, isopentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (Meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isononyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, and the like. These may be used alone or in combination of two or more. Both To be able to use. Of these, 2-ethylhexyl (meth) acrylate and n-butyl (meth) acrylate are preferably used. Incidentally, these alkyl groups R ² may be a straight chain or may be branched. Other examples of the non-acrylic monomer containing an alkoxysilyl group include vinylmethoxysilane and vinyltrimethoxysilane.
Various compounds such as non-acrylic monomers can be used. The added monomer is preferably a monofunctional monomer having one photopolymerizable group such as a (meth) acryl group or a vinyl group per molecule.

The photocurable pressure-sensitive adhesive composition usually contains at least one acrylic monomer as a diluent that lowers the viscosity during coating processing. However, if too much acrylic monomer component is added, UV irradiation occurs. Since it is necessary to increase the amount, the amount of the acrylic monomer added is preferably 50% by mass or less, more preferably 30% by mass or less of the resin component.
Further, when the organic solvent remains in the resin, the remaining organic solvent may cause a stain on the printed layer of the hard coat film on which the black frame printed layer is formed. Therefore, it is necessary to improve the solvent resistance in advance by using a UV curing agent or a crosslinking agent for the coating layer coating material.
In addition, urethane acrylate UV curable resins and acrylic syrups can be controlled after the addition of a photopolymerization initiator, when UV light contained in room light or sunlight acts on the acrylic syrup. Therefore, it is preferable that the photopolymerization initiator is added as soon as possible after the coating step, which is a subsequent step. This is the same for resin solutions in which acrylic syrup is dissolved in an organic solvent. It should be noted that the photopolymerization initiator prevents the reaction from starting before coating and film formation due to some external factor. That is.

The photopolymerization initiator (polymerization catalyst) used in the photocurable pressure-sensitive adhesive composition is not particularly limited. For example, acetophenone photopolymerization initiator, benzoin photopolymerization initiator, benzophenone photopolymerization initiator, Examples include thioxanthone photopolymerization initiators and thioxanthone photopolymerization initiators.
As the acetophenone photopolymerization initiator, acetophenone, p- (tert-butyl) 1 ′, 1 ′, 1′-trichloroacetophenone, chloroacetophenone, 2 ′, 2′-diethoxyacetophenone, hydroxylacetophenone, 2,2- Examples include dimethoxy-2′-phenylacetophenone, 2-aminoacetophenone, dialkylaminoacetophenone and the like.
Benzoin photopolymerization initiators include benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 1-hydroxyl cyclohexyl phenyl ketone, 2-hydroxyl 2-methyl-1-phenyl-2-methyl Propan-1-one, 1- (4-isopropylphenyl) -2-hydroxyl 2-methylpropan-1-one, benzyldimethyl ketal and the like can be mentioned.
Examples of the benzophenone photopolymerization initiator include benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, methyl-o-benzoylbenzoate, 4-phenylbenzophenone, hydroxylbenzophenone, hydroxylpropylbenzophenone, acrylic benzophenone, 4,4′-bis (dimethyl). Amino) benzophenone and the like.
Examples of the thioxanthone photopolymerization initiator include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, diethylthioxanthone, and dimethylthioxanthone.
Other photopolymerization initiators include α-acyl oxime ester, benzyl- (o-ethoxycarbonyl) -α-monooxime, acyl phosphine oxide, glyoxy ester, 3-ketocoumarin, 2-ethylanthraquinone, camphorquinone, tetra Examples include methyl thiuram sulfide, azobisisobutyronitrile, benzoyl peroxide, dialkyl peroxide, tert-butyl peroxypivalate and the like.
These photopolymerization initiators may be used alone or in combination of two or more. The content of the photopolymerization initiator is preferably 0.005 to 5% by mass, particularly preferably 0.01 to 2% by mass, based on the mass percentage based on 100% by mass of the total amount of the polymerizable compound. . If the content of the photopolymerization initiator is 0.005% by mass or more, the polymerizable compound can be polymerized in a short time, and if it is 5% by mass or less, the residue of the photopolymerization initiator hardly remains in the cured product. .

A cross-linking agent may be added to the photocurable resin composition as an optional component in order to cross-link the acrylic polymer. The number of functional groups contained in the cross-linking agent is selected according to the physical properties of the necessary pressure-sensitive adhesive composition, and the addition amount of the cross-linking agent can be adjusted as necessary.
The bifunctional crosslinking agent is not particularly limited as long as it is a compound having two functional groups that undergo crosslinking reaction in one molecule. Examples of such a bifunctional crosslinking agent include a bifunctional epoxy compound and a bifunctional isocyanate.
Examples of bifunctional epoxy compounds include ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, dipropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether. Aliphatic bifunctional epoxy compounds such as 1,6-hexanediol diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, o-phthalic acid diglycidyl ester, terephthalic acid diglycidyl ester, resorcin diglycidyl ether, etc. Aromatic bifunctional epoxy compounds can be mentioned. The epoxy group of the bifunctional epoxy compound can crosslink with the carboxyl group of the acrylic polymer.
Examples of the bifunctional isocyanate include aliphatic bifunctional isocyanates such as hexamethylene diisocyanate and isophorone diisocyanate (IPDI), and aromatic bifunctional isocyanates such as tolylene diisocyanate and diphenylmethane diisocyanate. The NCO group of the bifunctional isocyanate can undergo a crosslinking reaction with the carboxyl group or hydroxyl group of the acrylic polymer.
The content of the bifunctional crosslinking agent is within a range of 0.1 equivalent or less with respect to the crosslinking point of the acrylic polymer, for example, 0.5 to 3.0 parts by mass with respect to 100 parts by mass of the acrylic polymer. Is preferable, and 1.0-3.0 mass parts is more preferable.
The number of functional groups is not limited to bifunctional, and a trifunctional or higher functional cross-linking agent can be used to adjust necessary adhesive properties (adhesive strength, hardness, etc.).

In the pressure-sensitive adhesive layer used in the icon sheet of the present invention, the adhesive strength of the pressure-sensitive adhesive to the adherend is adjusted according to the state of the adherend, and the adhesion when the adherend is a glass plate Various additives such as tackifiers, softeners (plasticizers), fillers, anti-aging agents, silane coupling agents, etc. from the viewpoint of improving the strength and improving the durability of the pressure-sensitive adhesive layer It is also possible to add as necessary.
Examples of the tackifier include rosin and derivatives thereof, polyterpene, terpene phenol resin, coumarone-indene resin, petroleum resin, styrene resin, and xylene resin. Examples of the softening agent include liquid polyether, glycol ester, liquid polyterpene, liquid polyacrylate, phthalic acid ester, trimellitic acid ester, and the like.

(Photocurable resin composition)
In the method for producing an icon sheet of the present invention, the photocurable resin composition used for forming the cured resin layer is not particularly limited, but is urethane acrylate because it has excellent versatility and is inexpensive. A photocurable resin composition of the type is preferred. Examples of the urethane acrylate photocurable resin composition include polyester urethane (meth) acrylate, polyether (meth) acrylate, and polycarbonate (meth) urethane acrylate.
These photocurable resin compositions solidify without exhibiting tackiness during photocuring to form a cured resin layer.

Used in the preparation of the urethane acrylic photocurable resin composition, the main component consisting of a urethane acrylate polymer and / or urethane acrylate, an acrylic monomer, each essential component of a photopolymerization initiator, and as required Cross-linking agents, additives, etc. are a main agent composed of a urethane acrylate polymer and / or a urethane acrylate used for the preparation of the urethane acrylic photo-curing pressure-sensitive adhesive composition for forming the above-mentioned pressure-sensitive adhesive layer, acrylic It is prepared using the same components as the monomer, each essential component of the photopolymerization initiator, and, if necessary, the crosslinking agent and additives.
However, the urethane acrylic photocurable resin composition used to form the cured resin layer is essential for each of the main agent, acrylic monomer, and photopolymerization initiator that solidifies without exhibiting adhesiveness during photocuring. A composition in which components and, if necessary, a crosslinking agent and an additive are selected is used.

(Peeling film)
The adhesive layer of the icon sheet of the present invention is attached to the adherend in order to prevent dust and the like in the working environment from adhering to the surface of the adhesive layer and fouling in the work process to be bonded to the adherend. It is preferable to store a release film (also referred to as a protective film) laminated on the surface of the base material on the pressure-sensitive adhesive layer until just before bonding. In addition, when laminating a release film on the pressure-sensitive adhesive layer of the icon sheet of the present invention, it causes a cost increase, but the icon sheet of the present invention is in a state where the release film is bonded to the pressure-sensitive adhesive layer. The product is preferably shipped. When performing quality inspection after manufacturing the icon sheet of the present invention, the release film is applied with a release treatment agent on the transparent resin film so that it can be inspected for the presence of dirt or fouling. What is made is preferable. As the transparent resin film, a polyethylene terephthalate (PET) resin film is suitably used because of its relatively low price and high transparency. 10-250 micrometers is preferable and, as for the thickness of a transparent resin film, 30-200 micrometers is more preferable. Further, the method of the release treatment is not particularly limited, and a silicone release agent or an addition reaction type silicone release agent that has already been widely used may be used.

(Icon sheet)
The icon sheet of the present invention uses a hard coat film in which a hard coat layer is formed on one side or both sides of a base material, and when the hard coat layer is formed on one side, on the other side, When a hard coat layer is formed on both sides, a print layer composed of a frame and / or an icon is formed on one side by printing, and then the print layer of the hard coat film is formed. 2. Applying a photocurable resin composition having fluidity and a photocurable pressure-sensitive adhesive composition having fluidity to the top of the portion where the printed layer is not applied and the top of the printed layer. After forming the liquid layer, the resin composition and the pressure-sensitive adhesive composition were cured by irradiating with light, and the cured resin layer formed from the resin composition and the pressure-sensitive adhesive composition were formed. Simultaneous with adhesive layer Obtained by forming. It is preferable to provide a release film on the exposed surface of the pressure-sensitive adhesive layer.

When applying the photocurable resin composition having fluidity and the photocurable adhesive composition having fluidity to the surface on which the printed layer is formed, either one of the layers is coated, and then the other layer is applied. The two layers may be coated simultaneously by a multilayer coating method.
Moreover, after applying the photocurable resin composition having fluidity and the photocurable adhesive composition having fluidity to the surface on which the printed layer is formed, and forming two uncured composition layers These may be irradiated with ultraviolet rays to be photocured immediately, or after two uncured composition layers are formed, they may be left for a while and then photocured. After forming the layer of the uncured composition, the layer of the photocurable resin composition for forming the cured resin layer and the photocurable pressure sensitive adhesive composition for forming the adhesive layer are allowed to stand for a while. Are mixed at the interface, and a composition mixture layer is formed between these layers. Then, after the composition mixed layer is formed, the mixed resin layer is formed between the cured resin layer and the pressure-sensitive adhesive layer by photocuring these layers, and the cured resin layer and the pressure-sensitive adhesive layer. The interlayer adhesive strength can be increased, and peeling between these layers is difficult to occur.

  The icon sheet of the present invention is a long roll of a hard coat film in which a hard coat layer is formed on one surface of a substrate and a printed layer consisting of a frame and / or an icon is formed on the other surface by printing. Or a long hard coat film roll formed by printing a frame and / or an icon on one side with a hard coat layer on both sides and printing on either side. After preparing the roll body of the film, the portion of the surface of the hard coat film on which the print layer is formed while being fed out from the long roll body of the hard coat film is not provided with the print layer A liquid-curable photocurable resin composition and a flowable photocurable pressure-sensitive adhesive composition are continuously applied to the top of the printing layer and the printed layer to form two liquid layers. Then, on the pressure-sensitive adhesive composition, a step of bonding the release film drawn from the roll body of the long release film, a light irradiation step of irradiating light from above the release film, and a drying step, The resin composition and the pressure-sensitive adhesive composition are cured, and a cured resin layer formed from the resin composition and a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition are simultaneously formed, and a long icon sheet It can manufacture by the method of obtaining.

FIG. 1 is a diagram showing an example of an icon sheet of the present invention.
The icon sheet 1 of this example has a hard coat film in which a print layer 3 including a frame and / or an icon is formed on a transparent resin film 2 having a hard coat layer 7 and a surface on which the print layer 3 is formed. It is the structure which laminated | stacked the cured resin layer 4, the adhesive layer 5, and the peeling film 6 in order on the side.

In this icon sheet 1, the thickness of the transparent resin film 2 is preferably in the range of 25 μm to 188 μm, and more preferably in the range of 38 μm to 125 μm. When the thickness is less than 38 μm, there is no optical PET and workability is remarkably deteriorated. If it is 188 μm or more, it is against pencil hardness and dents, but it goes against reducing the thickness of the final product.
The thickness of the printing layer 3 is preferably in the range of 5 μm to 60 μm, and more preferably in the range of 10 μm to 30 μm. This range is because if the printed layer is thin, the color concealment and appearance are poor, and if it is too thick, the cost is greatly increased.
Moreover, it is preferable that the thickness of the cured resin layer 4 is the range of 1 micrometer-30 micrometers, and the range of 3 micrometers-15 micrometers is more preferable. When the thickness is less than 3 μm, it is necessary to use a harder material in order to exert the effect of preventing the formation of dents, but curling due to shrinkage during curing is not suitable. This is not the case if a material with low curl is found. There is no upper limit as long as it is thicker than the printing layer 3 including the adhesive layer 5, but if it becomes thicker as a final product, it is not possible to achieve thin film weight reduction.
This is not preferable because it increases the thickness.
The thickness of the pressure-sensitive adhesive layer 5 is preferably in the range of 5 μm to 30 μm, and more preferably in the range of 10 μm to 25 μm. If it is too thin, the adhesive force and holding power are reduced. If it is too thick, the weight of the thin film cannot be reduced, leading to an increase in cost.

<Preparation of hard coat film having printing layer>
As the transparent resin film, a polyethylene terephthalate (PET) resin film having a thickness of 125 μm was used, and a hard coat film (product name: HC7125F-TP, manufactured by DIC Corporation) having a hard coat layer formed on both surfaces was used. Using a silk printer, print and dry black pigment ink (Seiko Advance, HAC series, Conch 710 Black) on one side of the hard coat film so that the thickness after drying is 15 μm. Thus, a hard coat film A having a black frame printed layer having a vertical and horizontal dimension of about 115 mm × about 60 mm (the size of the display area in the black frame was about 90 mm × about 53 mm) was produced.
The obtained hard coat film A has a black frame printed layer with a thickness of 15 μm, and has a step height due to the black frame printed layer (hereinafter referred to as “print step height”).

Example 1
Using the hard coat film A, a urethane acrylic UV curable resin composition having fluidity is formed on the upper part of the black frame formed by the printed layer and the upper part of the black frame formed by the printed layer. The photocurable resin composition was laminated so that the thickness of A from the surface of the transparent resin film was 10 μm after curing.
On top of this, a UV curable pressure-sensitive adhesive composition (Case M Co., Ltd., T-470 type) having urethane acrylate fluidity mainly composed of urethane acrylate is applied to the transparent resin film surface of the hard coat film A. The photocurable pressure-sensitive adhesive composition layer was laminated so as to have a thickness of 25 μm after curing. Further, UV irradiation is performed under a nitrogen purge atmosphere, and the cured resin layer and the adhesive layer made of the urethane acrylate-based photocurable resin composition are cured at the same time on the printed layer side surface of the hard coat film A. A cured resin layer and an adhesive layer were formed, and the icon sheet of Example 1 was obtained.
Thus, in Example 1, the resin composition and the pressure-sensitive adhesive composition were cured, and the cured resin layer formed from the resin composition and the pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition were simultaneously used. Formed.

(Example 2)
Using the hard coat film A, a hard coat film A having a printed layer with a urethane acrylic UV curable resin composition on the upper part of the black frame formed by the printed layer and the upper part of the black frame formed by the printed layer. The photocurable resin composition was laminated so that the thickness from the surface of the transparent resin film was 5 μm after curing.
On top of that, a urethane acrylate UV curable pressure-sensitive adhesive composition (Case M Co., Ltd., T-470 type) mainly composed of urethane acrylate is applied from the transparent resin film surface of the hard coat film A having a printed layer. The pressure-sensitive adhesive composition layer was laminated by coating so as to have a thickness of 27 μm after curing. Further, UV irradiation is performed under a nitrogen purge atmosphere, and the cured resin layer and the adhesive layer made of the urethane acrylate-based photocurable resin composition are cured at the same time on the printed layer side surface of the hard coat film A. A cured resin layer and an adhesive layer were formed, and the icon sheet of Example 2 was obtained.

(Example 3)
Using the hard coat film A, a hard coat film A having a printed layer with a urethane acrylic UV curable resin composition on the upper part of the black frame formed by the printed layer and the upper part of the black frame formed by the printed layer. The photocurable resin composition was laminated so that the thickness from the surface of the transparent resin film was 3 μm after curing.
On top of that, a urethane acrylate UV curable pressure-sensitive adhesive composition (Case M Co., Ltd., T-470 type) mainly composed of urethane acrylate is applied from the transparent resin film surface of the hard coat film A having a printed layer. The pressure-sensitive adhesive composition layer was laminated by coating so as to have a thickness of 27 μm after curing. Further, UV irradiation is performed under a nitrogen purge atmosphere, and the cured resin layer and the adhesive layer made of the urethane acrylate-based photocurable resin composition are cured at the same time on the printed layer side surface of the hard coat film A. A cured resin layer and an adhesive layer were formed, and the icon sheet of Example 3 was obtained.

Example 4
Using the hard coat film A, a hard coat film A having a printed layer with a urethane acrylic UV curable resin composition on the upper part of the black frame formed by the printed layer and the upper part of the black frame formed by the printed layer. The photocurable resin composition was laminated by coating so that the thickness from the surface of the transparent resin film was 15 μm after curing.
On top of that, a urethane acrylate UV curable pressure-sensitive adhesive composition (Case M Co., Ltd., T-470 type) mainly composed of urethane acrylate is applied from the transparent resin film surface of the hard coat film A having a printed layer. The pressure-sensitive adhesive composition layer was laminated by coating so as to have a thickness of 27 μm after curing. Further, UV irradiation is performed under a nitrogen purge atmosphere, and the cured resin layer and the adhesive layer made of the urethane acrylate-based photocurable resin composition are cured at the same time on the printed layer side surface of the hard coat film A. A cured resin layer and an adhesive layer were formed to obtain an icon sheet of Example 4.

(Comparative Example 1)
Urethane acrylate mainly composed of urethane acrylate used in the examples, after one side of a polyethylene terephthalate (PET) resin film having a vertical and horizontal dimension of about 115 mm × about 60 mm and a thickness of 50 μm is subjected to a release treatment with silicone. A UV curable pressure-sensitive adhesive composition (T-470 type, manufactured by Case M Co., Ltd.) was applied so that the thickness after curing was 25 μm, and a pressure-sensitive adhesive composition layer was laminated. Furthermore, it was cured by performing UV irradiation under a nitrogen purge atmosphere to form an optical transparent adhesive layer. Then, the release treatment surface of the polyethylene terephthalate (PET) resin film having a thickness of 38 μm, on which the release agent layer is formed by performing the release treatment with silicone, is laminated and laminated on the optical transparent adhesive layer. Thereby, the transfer film (double-sided pressure-sensitive adhesive tape) of the transparent adhesive layer for optics of Comparative Example 1 was obtained.
Using the obtained optical transparent pressure-sensitive adhesive layer transfer film (double-sided pressure-sensitive adhesive tape) of Comparative Example 1, the optical transparent pressure-sensitive adhesive layer having a thickness of 25 μm was replaced with a hard coat film A (15 μm The icon sheet of Comparative Example 1 was obtained by laminating and laminating on the surface on which the printing layer (having a printing step) was formed.
In the icon sheet of Comparative Example 1 obtained, many bubbles were generated at the printing step.

(Comparative Example 2)
Using the hard coat film A, a urethane acrylate-based UV curable pressure-sensitive adhesive composition containing urethane acrylate as a main component (on the upper part of the black frame formed by the printed layer and the black frame formed by the printed layer) Case M Co., Ltd., T-470 type) was applied so that the thickness from the surface of the transparent resin film of the hard coat film A having a printed layer was 27 μm after curing, and an adhesive composition layer was laminated. Furthermore, UV irradiation was performed under a nitrogen purge atmosphere to cure the urethane acrylate-based UV curable resin composition to form an optical transparent pressure-sensitive adhesive layer, whereby an icon sheet of Comparative Example 2 was obtained.

(Bubble confirmation test after bonding)
The icon sheets of Examples 1 to 4 and Comparative Examples 1 and 2 that were produced using a bonding apparatus (Clim Products, product name: small sheet bonding machine, model: SE320) were prepared using an ITO film ( The operation | work which bonds to the ITO surface of the glass plate which bonded the product made from Nakai Kogyo Co., Ltd., product name: Metaforce 125R2 * A, surface resistance value 250 ohm / m < ² >) with the adhesive tape was performed.

(Dimple test)
A pencil hardness test according to K5400-1 was performed except that the load was 1 kg, which was a sample produced by the bubble confirmation test after bonding. As a result, in Examples 1 and 2 and Comparative Example 1, a pencil hardness of 2H was satisfied, and no dents could be visually confirmed in the portion rubbed with a pencil. However, in Comparative Example 2, the pencil hardness 2H was satisfied, but a depression was visually confirmed.

About the icon sheet | seat of Examples 1-4, it was able to bond without producing a bubble in the part which has a printing level | step difference with a transparent resin film and the black frame of a printing layer.
However, in the icon sheets of Comparative Examples 1 and 2, the printing step at the portion where there is a printing step between the transparent resin film and the black frame of the printing layer could not be filled, and bubbles were generated.
Moreover, about the icon sheet | seat of the comparative examples 1 and 2, although the bubble which generate | occur | produced was able to be reduced entirely by the subsequent autoclave process (40 degreeC x 0.5 mMPa x 15 minutes), it can be confirmed visually. Bubbles of size remained. For the icon sheet of Comparative Example 1, the adhesive thickness / printing step distance = 35 μm / 15 μm = 2.3, the adhesive thickness is larger than the printing step distance, and the unevenness absorption is easy. This is because the adhesive strength of the adhesive layer is low and the adhesive is hard. In addition, for the icon sheet of Comparative Example 2, although the adhesive strength is high, the adhesive thickness / printing step distance = 65 μm / 41 μm = 1.6, and the adhesive thickness is larger than the printing step distance, resulting in unevenness. This is thought to be due to the difficulty of absorption.

  Japanese Patent Application No. 2010-026814, which is a patent application related to the present invention, is based on the inventors of the present invention, but judging from the results of Example 8 shown in the specification of the present application, When the storage elastic modulus of the pressure-sensitive adhesive layer used in the icon sheet is applied, it is considered that the thickness of the pressure-sensitive adhesive layer that fills the printing step needs to be 10 times or more the printing step distance (for example, the application) In Example 8 of the specification, a printing step of 20 μm is filled with an adhesive layer having a thickness of 200 μm). However, the icon sheet of the present invention uses a polyethylene terephthalate (PET) resin film having a thickness of 125 μm, which is flexible and can be deformed flexibly, as the transparent resin film. Even if the thickness of the pressure-sensitive adhesive layer to be buried is less than 10 times the printing step distance, even if the printing step distance is filled, it can be considered that the bonding can be performed without generating bubbles.

In an icon sheet having a conventional pressure-sensitive adhesive layer, when bonding to an adherend having a printed step, a pressure-sensitive adhesive layer that forcibly forms the icon sheet by using a flexible pressure-sensitive adhesive layer with enhanced adhesive strength and Since the base film is deformed and pasted, not only the distortion of the base film but also the area where the density of the adhesive layer is high at the periphery of the printing step, the part away from the periphery of the printing step Then, there existed a problem that the density of an adhesive layer became low.
As a result, the transmitted light beam is refracted due to the difference in the density of the resulting adhesive layer, and the image from the image display body may appear distorted. For example, when an icon sheet having a conventional pressure-sensitive adhesive layer is bonded to the surface of the display, the reflected light is distorted in a state where no image is displayed, and the smoothness as in the case of using glass cannot be obtained. Therefore, there has been a problem that the designability is also lowered.

The icon sheet according to the present invention includes a black frame and / or an upper portion of a portion having no step formed by a print layer of an icon (a portion on which a display image is displayed) and a portion on which a black frame and / or an icon is printed. Since the upper part of (the display image is not displayed) has an adhesive layer with a different thickness, and the surface of the adhesive layer is in a state where there is no difference in thickness than the distance of the printing step. The surface of the hard coat layer has reduced physical unevenness and optical distortion.
In addition, since the icon sheet according to the present invention can fill a printing step regardless of the flexibility of the adhesive layer, not only the flexible adhesive layer with enhanced adhesive strength but also a hard adhesive layer for re-peeling Alternatively, it is possible to use an adhesive layer having a very hard slight adhesive force that does not transfer the adhesive layer.
Moreover, when bonding the icon sheet of this invention to a to-be-adhered body, it is more preferable since the workability | operativity can be improved by using the said bonding apparatus, for example, without performing manual bonding.

  The present invention relates to a hard coat film that has little optical distortion due to a printing step, has few remaining bubbles, and does not easily form a dent even when a load is applied thereto, and a touch panel using the hard coat film. The hard coat film of the present invention can be suitably used as an anti-scattering film used for protecting a touch panel or an icon sheet bonded to the ITO surface of a capacitive touch panel.

  DESCRIPTION OF SYMBOLS 1 ... Icon sheet, 2 ... Transparent resin film, 3 ... Printed layer, 4 ... Hardened resin layer, 5 ... Adhesive layer, 6 ... Release film, 7 ... Hard-coat layer.

Claims (7)

A method for producing an icon sheet having a printed layer and an adhesive layer on one side of a hard coat film,
Use a hard coat film with a hard coat layer formed on one or both sides of the substrate, and if a hard coat layer is formed on one side, form a hard coat layer on both sides. A printed layer comprising a frame and / or an icon is formed on one of the surfaces by printing, and then the printed layer is applied to the surface of the hard coat film on which the printed layer is formed. Two liquid layers were formed by applying a fluid photocurable resin composition and a fluid photocurable pressure-sensitive adhesive composition to the upper part of the unprinted part and the printed layer. Thereafter, the resin composition and the pressure-sensitive adhesive composition are cured by light irradiation, and a cured resin layer formed from the resin composition and a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition are simultaneously formed. It is characterized by Icon sheet method of manufacturing.   The method for producing an icon sheet according to claim 1, wherein a release film subjected to a release treatment is disposed on the surface of the pressure-sensitive adhesive layer. A method for producing an icon sheet having a printed layer and an adhesive layer on one side of a hard coat film,
A long roll of a hard coat film in which a hard coat layer is formed on one side of a substrate and a printed layer consisting of a frame and / or an icon is formed on the other side by printing, or a hard coat layer on both sides After preparing a roll body of a long hard coat film and a roll body of a long release film in which a printing layer composed of a frame and / or an icon is formed by printing on either side The upper surface of the surface of the hard coat film on which the printed layer is formed while being unwound from the long roll body of the hard coat film, and the upper portion of the printed layer A step of continuously applying a photocurable resin composition having fluidity and a photocurable pressure-sensitive adhesive composition having fluidity to form two liquid layers; In The resin composition and the pressure-sensitive adhesive composition are subjected to a step of bonding a release film drawn from a roll body of the long release film, a light irradiation step of irradiating light from above the release film, and a drying step. A cured icon layer formed from the resin composition and a pressure-sensitive adhesive layer formed from the pressure-sensitive adhesive composition are simultaneously formed to obtain a long icon sheet. Method.   The icon sheet obtained by the manufacturing method of the icon sheet of any one of Claims 1-3.   The icon sheet according to claim 4, further comprising a mixed layer at an interface between the cured resin layer and the pressure-sensitive adhesive layer.   A touch panel in which the icon sheet according to claim 4 or 5 is bonded via the pressure-sensitive adhesive layer.   An electronic device in which the touch panel according to claim 6 is incorporated.

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