CN103666304B - The manufacture method of icon sheet, icon sheet and use the contact panel of this icon sheet - Google Patents

Abstract

The present invention provides an icon sheet with less optical distortion caused by printing steps, less air bubbles remaining, less indentation even when a load is applied, and less peeling of an adhesive layer, and a manufacturing method thereof. The manufacturing method of the icon sheet at least includes: forming a hard coating film with a hard coating on one side or both sides of the substrate, and forming a printing layer composed of frames and/or icons by printing; A step of forming an adhesive film with an adhesive layer on the peeling-treated surface of the peeling film on which the peeling treatment is applied; on the upper part of the part where the printing layer is not applied on the surface of the hard coat film on which the printing layer is formed; and The upper part of the aforementioned printing layer is coated with a fluid photocurable resin composition, and the step of laminating the photocurable resin layer; the step of attaching the adhesive film to the aforementioned photocurable resin layer through the aforementioned adhesive layer; and a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

Description

Method for manufacturing icon sheet, icon sheet, and touch panel using same

technical field

The present invention relates to a method for manufacturing an icon sheet having a printing layer and an adhesive layer on one side of a hard coat film, an icon sheet obtained by the manufacturing method, and a touch panel using the icon sheet.

In addition, the "printing step" in this specification means: in the state where the printing layer of the black frame and/or the icon is formed on the surface of the substrate made of a transparent resin film, the printing layer is calculated from the surface of the substrate. thickness.

Background technique

A touch panel is known in which a hard coat film is bonded to the surface, and an icon for instructing an operation method is printed on the hard coat film (for example, refer to 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 (inorganic electroluminescence, organic electroluminescence) display, and the like. Furthermore, examples of specific electronic devices using the touch panel include liquid crystal televisions, mobile terminals, mobile phones, electronic paper, electronic book terminals, personal computers, and the like.

Patent Document 1 discloses that in the case of laminating a hard coat film printed with an icon using a pressure-sensitive adhesive, if the level difference (difference in level) between the portion printed with the icon and its surroundings is controlled below 5 μm, Then, generation of air bubbles can be prevented at the time of bonding.

Moreover, when the hard coat film printed with the icon indicating the operation method is bonded to the surface of the touch panel, in order to prevent the mixing of air bubbles due to the printing level difference of the icon, various methods have been tried (for example, refer to Patent Document 3~7).

In addition, Patent Documents 8 and 9 disclose a method of manufacturing an image display panel in which a decorative layer is applied to the rear surface of a see-through panel substrate for image display. Wherein, the inner side of the decorative layer step difference on the back of the panel substrate and the upper surface of the decorative layer are continuously filled with ultraviolet curable resin or thermosetting resin, and then, on the upper surface of the cured resin, a diaphragm coated with a release agent is covered, and In this state, the separator was subjected to UV irradiation while being pressed against the cured resin side, and then the separator was peeled off to obtain an image display panel.

Moreover, about the technique of laminating two photocurable resins and hardening simultaneously, patent documents 10-12 disclose, for example.

However, in the display device described in Patent Document 3, when the light-transmitting member (corresponding to the hard coat film) is bonded to the surface of the touch panel through the adhesive layer and the pressure-sensitive adhesive layer, additional labor and labor are required. time, thus leading to an increase in cost, which cannot be utilized in cheap display devices. In addition, in the display device described in Patent Document 3, although a light-shielding layer with a thickness of about 5 to 10 μm surrounding the outer periphery of the liquid crystal device is formed, an adhesive layer and a pressure-sensitive adhesive layer are arranged to avoid the influence of printing steps of the light-shielding layer. agent layer area.

In addition, Patent Document 4 discloses that a transparent resin is used to fill the level difference between a transparent protective plate made of acrylic resin or polycarbonate resin and a printed part to make it flat, and furthermore, that a double-sided tape or a transparent adhesive is used. Adhesive, attach the protective plate to the surface of the display.

According to Patent Document 4, the film thickness of the photocurable resin is preferably at least twice the thickness of the printed layer, but details of the planarization method using the photocurable resin are not described in detail.

In addition, Patent Document 5 discloses that a surface protection layer (corresponding to a protective film) having a light-shielding layer (corresponding to a printed layer of a logo) is bonded to a contact surface through a pressure-sensitive adhesive layer having a specific storage modulus. surface of the control panel. When this adhesive layer is used, bubbles are not generated, but after the surface protection layer is attached to the touch panel, the adhesive is cured by irradiating ultraviolet rays from the opposite side of the surface protection layer or the touch panel. , therefore, the inner side of the light-shielding layer cannot be sufficiently irradiated with ultraviolet rays.

In addition, Patent Document 6 discloses that a transparent surface plate (corresponding to a protective film) having a black printed layer (corresponding to a printed layer of an icon) is bonded to a touch panel through a transparent adhesive sheet having a specific storage modulus. s surface.

Thus, no blistering occurs on the bonding surface between the liquid crystal display panel and the plastic plate (protective transparent plate). However, since the protective transparent plate made of transparent plastic is bonded to the liquid crystal panel through a transparent adhesive sheet, it is unavoidable that air bubbles remain at the corners of the black printed layer where the level difference occurs.

Furthermore, Patent Document 7 discloses that a design panel having an outer frame is bonded to a touch panel with a double-sided tape.

Since the sticking surface of the double-sided tape is substantially planar as a whole, air bubbles are not generated between the appearance panel and the double-sided tape. However, since the appearance panel is bonded to the touch panel with a double-sided tape, air bubbles cannot be prevented from remaining in the stepped corners of the printed layer of the outer frame.

In addition, although the image display panels disclosed in Patent Documents 8 and 9 can reduce generation of air bubbles, indentation tends to occur when a load is applied to the obtained panel.

In addition, the inventions disclosed in Patent Documents 10 to 12 all relate to pressure-sensitive adhesive films and pressure-sensitive adhesive tapes, and disclose production by simultaneously curing a base material and an adhesive layer. However, in this case, in order to impart stress relaxation to the adhesive tape, the substrate layer needs to be thicker than the adhesive layer, so the viscosity of the resin composition solution for the substrate layer is set to be higher than the viscosity. The viscosity of the binder composition solution.

Therefore, when the inventions disclosed in Patent Documents 10 to 12 are used to fill the upper part of the hard coat film where the printed layer is not applied with a high-viscosity photocurable resin composition, it is inevitable that air bubbles will remain in the printed layer. The corners with step difference.

In addition, in addition to the above-mentioned problem of bubbles, when producing an icon sheet having a printing layer and an adhesive layer on one side of the hard coat film, if the adhesive layer laminated on the release film in advance is bonded to the hard coat If the icon sheet is produced on the printed layer side of the coating film, the adhesive strength of the adhesive layer is reduced, and the adhesive layer is easily peeled off in a high-humidity environment.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2003-036143

Patent Document 2: Japanese Patent Laid-Open No. 2004-213187

Patent Document 3: Japanese Patent Laid-Open No. 2009-098324

Patent Document 4: Japanese Patent Laid-Open No. 2010-176111

Patent Document 5: Japanese Patent Laid-Open No. 2010-072471

Patent Document 6: Japanese Patent Laid-Open No. 2010-097070

Patent Document 7: Japanese Patent Laid-Open No. 2010-239324

Patent Document 8: Japanese Patent Laid-Open No. 2012-22281

Patent Document 9: Japanese Patent Laid-Open No. 2012-22210

Patent Document 10: Japanese Patent Laid-Open No. 2000-248241

Patent Document 11: Japanese Patent Laid-Open No. 2004-204090

Patent Document 12: Japanese Patent Application Laid-Open No. 1-121386

Contents of the invention

The problem to be solved by the invention

The present invention has been made in view of the above circumstances, and its object is to provide an icon sheet that has little optical distortion due to printing level difference, has few remaining air bubbles, and is hard to be indented even when a load is applied, and whose adhesive layer is hard to peel off. A manufacturing method, an icon sheet, and a touch panel using the icon sheet.

Solution to the problem

In order to solve the above-mentioned problems, the present invention provides a method for manufacturing an icon sheet, which is a method for manufacturing an icon sheet with a printing layer and an adhesive layer on one side of the hard coat film, and is characterized in that it at least includes:

Step (1): Using a hard coat film formed on one or both sides of the base material, if the hard coat layer is formed on one side of the base material, then on the other side of the base material A printing layer consisting of frames and/or icons is formed by printing on the surface. If a hard coat layer is formed on both sides of the substrate, a frame and/or icon is formed by printing on either side of the hard coat film. / or the process of printing layers of icons;

Step (2): a step of preparing an adhesive film in which an adhesive layer is formed on the peeled surface of the peeled film;

Step (3): Applying a fluid photocurable resin composition on the surface of the hard coat film on which the printed layer is not applied and on the upper portion of the printed layer, thereby A step of laminating photocurable resin layers;

Step (4): The previously prepared adhesive film having an adhesive layer formed on the peeling surface of the peeling film that has been peeled is bonded to the photocurable resin layer through the adhesive layer. on the process;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

In addition, the present invention also provides a method for manufacturing an icon sheet, which is a method for manufacturing an icon sheet with a printing layer and an adhesive layer on one side of the hard coat film, and is characterized in that it at least includes:

Step (1): It is a step of preparing a long roll body of a hard coat film, wherein a hard coat film having a hard coat layer formed on one side or both sides of a base material is used, and if the hard coat film is formed on one side of the base material If a hard coat layer is formed on one side of the substrate, a printing layer consisting of frames and/or icons is formed by printing on the other side of the substrate. If a hard coat layer is formed on both sides of the substrate, then the Form a printing layer made of frames and/or icons by printing on any one side of the hard coat film;

Step (2): It is a step of preparing an elongated roll body of the adhesive film, wherein the elongated roll body of the adhesive film is formed with an adhesive layer on the peeling-treated surface of the peeling film to which the peeling process has been applied. binder layer;

Step (3): While rewinding and sending out the elongated roll body of the hard coat film, a part of the hard coat film on which the printed layer is formed is not applied with the printed layer The upper part of the upper part and the upper part of the printing layer, coating a flowable photocurable resin composition, thereby laminating the step of photocurable resin layer;

Step (4): the step of rewinding the elongated roll body of the adhesive film and sending out the adhesive film, and attaching the adhesive layer to the photocurable resin layer through the adhesive layer;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

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

In addition, the present invention also provides a touch panel formed by pasting the aforementioned icon sheet through the aforementioned adhesive layer.

In addition, the present invention also provides an electronic device assembled with a touch panel.

Invention effect

The manufacturing method of the icon sheet of the present invention at least includes:

Step (1): Using a hard coat film formed on one or both sides of the base material, if the hard coat layer is formed on one side of the base material, then on the other side of the base material A printing layer made of frames and/or icons is formed by printing on the surface. If a hard coat layer is formed on both sides of the substrate, a frame and/or icon is formed by printing on either side of the hard coat film. and/or the process of printing layers of icons;

Step (2): a step of preparing an adhesive film in which an adhesive layer is formed on the peeled surface of the peeled film;

Step (3): Applying a fluid photocurable resin composition on the surface of the hard coat film on which the printed layer is not applied and on the upper portion of the printed layer, thereby A step of laminating photocurable resin layers;

Step (4): The previously prepared adhesive film having an adhesive layer formed on the peeling surface of the peeling film that has been peeled is bonded to the photocurable resin layer through the adhesive layer. on the process;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

Therefore, it is possible to efficiently manufacture an icon sheet with less distortion due to printing steps, less residual air bubbles, less indentation under load, and less peeling of the adhesive layer.

In addition, the icon sheet of the present invention can be preferably used as an anti-shattering film, particularly as an icon sheet bonded to the ITO surface of a capacitive touch panel.

Description of drawings

Fig. 1 is a sectional view showing an example of the icon sheet of the present invention.

Explanation of reference signs

1...icon sheet; 2...transparent resin film; 3...printing layer; 4...cured resin layer; 5...adhesive layer; 6...peeling film; 7...hard coat layer.

detailed description

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

The manufacturing method of the icon sheet of the present invention is the manufacturing method of the icon sheet having printing layer and adhesive layer on one side of hard coat film, it is characterized in that, at least comprises:

Step (1): Using a hard coat film formed on one or both sides of the base material, if the hard coat layer is formed on one side of the base material, then on the other side of the base material A printing layer consisting of frames and/or icons is formed by printing on the surface. If a hard coat layer is formed on both sides of the substrate, a frame and/or icon is formed by printing on either side of the hard coat film. / or the process of printing layers of icons;

Step (2): a step of preparing an adhesive film in which an adhesive layer is formed on the peeled surface of the peeled film;

Step (3): Applying a fluid photocurable resin composition on the surface of the hard coat film on which the printed layer is not applied and on the upper portion of the printed layer, thereby A step of laminating photocurable resin layers;

Step (4): The previously prepared adhesive film having an adhesive layer formed on the peeling surface of the peeling film that has been peeled is bonded to the photocurable resin layer through the adhesive layer. on the process;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

In addition, the manufacturing method of the icon sheet of the present invention is a manufacturing method of an icon sheet having a printing layer and an adhesive layer on one side of the hard coat film, and is characterized in that it at least includes:

Step (1): It is a step of preparing a long roll body of a hard coat film, wherein a hard coat film having a hard coat layer formed on one side or both sides of a base material is used, and if the hard coat film is formed on one side of the base material If a hard coat layer is formed on one side of the substrate, a printing layer consisting of frames and/or icons is formed by printing on the other side of the substrate. If a hard coat layer is formed on both sides of the substrate, then the Form a printing layer made of frames and/or icons by printing on any one side of the hard coat film;

Step (2): It is a step of preparing an elongated roll body of the adhesive film, wherein the elongated roll body of the adhesive film is formed with an adhesive layer on the peeling-treated surface of the peeling film to which the peeling process has been applied. binder layer;

Step (3): While rewinding and sending out the elongated roll body of the hard coat film, a part of the hard coat film on which the printed layer is formed is not applied with the printed layer The upper part of the upper part and the upper part of the printing layer, coating a flowable photocurable resin composition, thereby laminating the step of photocurable resin layer;

Step (4): the step of rewinding the elongated roll body of the adhesive film and sending out the adhesive film, and attaching the adhesive layer to the photocurable resin layer through the adhesive layer;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

(hard coating)

As the hard coat film used in the manufacturing method of the icon sheet of this invention, the hard coat film which has a hard coat layer on one surface or both surfaces of the transparent resin film used as a base material is used.

As the above-mentioned transparent resin film, it is preferably selected from polyethylene terephthalate (PET) resin film, polyethylene naphthalate (PEN) resin film, cyclic polyolefin (COP) resin One of the transparent and heat-resistant resin film groups composed of films. It is particularly preferable to use a polyethylene terephthalate (PET) resin film from the viewpoint of relatively low price and high transparency.

The thickness of the transparent resin film is preferably 10 to 250 μm, more preferably 30 to 200 μm. When the thickness of the transparent resin film is less than 10 μm, it is not preferable since the handleability will be poor. Moreover, when the thickness of a transparent resin film exceeds 250 micrometers, since transparency will fall and a cost will become high, and the processing suitability in the manufacturing process of a hard coat film will worsen, it is unpreferable. From the above viewpoint, the thickness of the transparent resin film is preferably 10 to 250 μm, more preferably 30 to 200 μm. Moreover, in order to improve the adhesion between the transparent resin film and the hard coat layer, an appropriate easy-adhesive resin layer can be laminated on the surface of the transparent resin film, and surface treatment such as flame treatment, corona treatment, and plasma treatment can also be applied. deal with. In addition, a base layer may be provided between the transparent resin film and the hard coat layer.

(hard coat)

The hard coat layer formed on the transparent resin film only needs to have a hard coat property to the extent that it can be used as a surface material of a touch panel, and generally, as long as the measured value in the pencil hardness test is 2H or more, it is practical. no problem. The resin used for the hard coat layer is not particularly limited, and heat-curable hard coat resins such as silicone-based and melamine-based resins, or ultraviolet-curable hard-coat resins such as silicone-based and acrylic-based resins can be used. Moreover, in the hard coat film of this invention, a hard coat layer is formed in one surface or both surfaces of a transparent resin film. When the hard coat layer is formed on only one side of the transparent resin film, warping and deflection due to thermal expansion are likely to occur. Therefore, except for the case where price is prioritized over performance and it is necessary to provide an inexpensive hard coat film , It is preferable to form a hard coat layer on both sides of the transparent resin film.

In addition, the thickness of the hard coat layer is preferably 1 to 10 μm, more preferably 2 to 8 μm. When the thickness of the hard coat layer is less than 1 μm, the hard coat performance cannot be obtained, the scratch resistance is lowered, and when an ultraviolet curable hard coat resin is used, poor curing tends to occur.

In addition, when the thickness of the hard coat layer exceeds 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.

In addition, if necessary, additives such as antistatic agents and ultraviolet absorbers may be added to the hard coat layer for imparting various functions thereto. As a method for forming the hard coat layer on the surface of the transparent resin substrate, conventionally known methods such as reverse coating, die coating, and gravure coating can be used.

In addition, when the printed layer and the adhesive layer are laminated on the hard coat layer, for the purpose of improving the adhesion between the hard coat layer, the printed layer and the adhesive layer, an appropriate easy-to-coat layer can be laminated on the surface of the hard coat layer. The adhesive base layer may also be subjected to surface treatments such as flame treatment, corona treatment, and plasma treatment.

(black frame and/or print layer for icons)

The present invention relates to a method for producing an icon sheet having a printing layer and an adhesive layer on one side of a hard coat film.

In the icon sheet according to the present invention, the black frame formed by the printed layer is to prevent the phenomenon that the illumination light irradiated by the display panel (such as the backlight of the liquid crystal panel) installed behind the touch panel leaks from the periphery of the display panel. , a black frame provided to shield the periphery of the display panel from light. In addition, the icons formed by the printed layer are icons frequently used for icons displayed on the screen of the touch panel (displays of patterns, characters, symbols, etc. for inputting or selecting specific functions, operations, items, etc.) , set to display in a fixed form.

The formation of the black frame and/or icon based on the printing layer is carried out by applying/drying a paint composed of a resin composition containing a light-shielding black pigment by screen printing, gravure printing, etc., thereby forming a light-shielding sex film. As the black pigment, can be used selected from carbon black, graphite, aniline black, phthalocyanine black (Cyanine Black), titanium black (チタンブラック, Black Titanium Oxide (black titanium oxide)), black iron oxide, chromium oxide, oxide One of the group consisting of manganese or two or more of them are used in combination. Among these black pigments, carbon black is particularly preferably used. The particle diameter distribution range of the black pigment (light absorbing material) is preferably in the range of 0.01 to 0.5 μm, more preferably in the range of 0.05 to 0.3 μm. Moreover, in order to adjust the color tone of a light-shielding layer to a colorless or ideal color tone, you may use several other coloring materials as needed. In addition, when forming a black frame with a printed layer, for example, an acrylic paint in which carbon black as a black pigment is dispersed is used, and the black frame is formed by adjusting the film thickness of the printed layer to 10 to 50 μm. The printed layer need not be limited to black, and various colors such as glossy resin, white, and various colors can be selected.

(Photocurable adhesive composition)

In the method for producing the icon sheet of the present invention, the photocurable adhesive composition used to form the adhesive layer is not particularly limited.

As the photocurable adhesive composition, for example, an acrylic resin syrup-based photocurable adhesive composition containing an acrylic polymer, an acrylic monomer, and a photopolymerization initiator as essential components, or Polyurethane acrylic photocuring system composed of urethane acrylate polymer and/or urethane acrylate as the main agent, acrylic monomer and photopolymerization initiator as necessary components and adding crosslinking agent, additives, etc. type adhesive composition.

These photocurable adhesive compositions exhibit adhesiveness during photocuring and are cured to form an adhesive layer.

The acrylic resin paste photocuring agent adhesive composition needs to be cooled or introduced oxygen to end the polymerization abruptly or to set the process of volatilizing the organic solvent used in the polymerization, so it is combined with the polyurethane acrylic photocuring agent adhesive composition Compared with the composition, it is difficult to obtain a stable composition. Therefore, a urethane acrylic photocurable adhesive composition is preferable.

Urethane acrylate as the main component of the photocurable resin composition, for example, a compound having one or more (meth)acryloyl groups in one molecule, which is obtained by having two or more (meth)acryloyl groups in one mole The above NCO-based compound is obtained by reacting with more than two moles of hydroxyl-containing acrylic monomers. Here, examples of hydroxyl-containing acrylic monomers include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 44-hydroxybutyl (meth)acrylate, polyethylene Hydroxyl-containing (meth)acrylates such as glycol mono(meth)acrylate, polypropylene glycol mono(meth)acrylate, and cyclohexanedimethanol mono(meth)acrylate.

In addition, the compound having two or more NCO groups in one molecule is preferably an oligomer having a molecular weight of about 500 to 50,000 obtained by reacting a polyisocyanate compound such as diisocyanate and a polyol compound such as diol.

Examples of polyisocyanate compounds include aliphatic polyisocyanates such as hexamethylene diisocyanate and isophorone diisocyanate, toluene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, and phenylene diisocyanate. Aromatic polyisocyanate such as isocyanate.

Examples of the polyol compound include glycols such as ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, and 1,4-cyclohexanedimethanol; Triol, pentaerythritol and other polyhydric alcohols with more than trivalence; polyether diols such as polyethylene glycol, polypropylene glycol, poly(1,4-butylene glycol), poly(1,6-hexanediol); the above Polyester-type diols obtained by reacting diols with dibasic acids such as phthalic acid, isophthalic acid, terephthalic acid, maleic acid, fumaric acid, adipic acid, and sebacic acid, etc.

Also, in the aforementioned photocurable resin composition, at least one kind of urethane acrylate and at least one kind of (meth)acrylate may be contained. Other monomers may be added as long as the effects of the present invention are not impaired. As (meth)acrylic acid esters, for example, can be cited: by the general formula CH ₂ =CR ¹ -COOR ² (in the formula, R ¹ represents hydrogen or methyl, R ² represents an alkyl group with 1 to 14 carbon atoms ) represents acrylic monomers such as alkyl (meth)acrylates. Specific examples of the alkyl (meth)acrylate represented by the general formula CH ₂ =CR ¹ -COOR ² include methyl (meth)acrylate, ethyl (meth)acrylate, (meth)acrylate base) n-propyl acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, tert-butyl (meth)acrylate, n-pentyl (meth)acrylate ester, isoamyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, ( Isononyl methacrylate, decyl (meth)acrylate, lauryl (meth)acrylate, etc. These may be used alone or in combination of two or more. Among them, 2-ethylhexyl (meth)acrylate and n-butyl (meth)acrylate are preferably used. In addition, these alkyl groups R ² may be either linear or branched. Examples of other alkoxysilyl group-containing non-acrylic monomers include vinylmethoxysilane, vinyltrimethoxysilane, and the like.

In addition, various compounds such as non-acrylic monomers can also be used. The added monomer is preferably a monofunctional monomer having one photopolymerizable group such as a (meth)acryloyl group or a vinyl group in one molecule.

The aforementioned photocurable resin composition generally contains at least one acrylic monomer to serve as a diluent to lower the viscosity during coating processing. However, if the acrylic monomer component is added in excess, the amount of UV irradiation needs to be increased, so the amount of the acrylic monomer added is preferably 50% by mass or less of the resin component, more preferably 30% by mass or less.

Moreover, when an organic solvent remains in a resin, the remaining organic solvent may contaminate the printing layer of the hard coat film in which the black frame was formed. Therefore, it is necessary to use a UV curing agent or a crosslinking agent in advance to improve the solvent resistance of the coating material for the printing layer.

In addition, for urethane acrylate UV curable resins and acrylic resin pulp, after adding a photopolymerization initiator, once the ultraviolet light contained in indoor light or sunlight acts on the acrylic resin pulp, it may cause polymerization reaction. happen, uncontrollable. Therefore, it is preferable to add a photoinitiator as much as possible immediately before the coating process which is a post process. In the case of a resin solution in which an acrylic resin syrup is dissolved in an organic solvent, the same treatment is carried out, that is, care must be taken to prevent the photopolymerization initiator from reacting before coating or film formation due to some external factors. Phenomenon.

The photopolymerization initiator (polymerization catalyst) used in the aforementioned photocurable resin composition is not particularly limited, and examples thereof include: acetophenone-based photopolymerization initiators, benzoin-based photopolymerization initiators, Benzophenone-based photopolymerization initiators, thioxanthone-based photopolymerization initiators, and the like.

Examples of the acetophenone-based photopolymerization initiator include: acetophenone, p-tert-butyl-1',1',1'-trichloroacetophenone, chloroacetophenone, 2',2'-bis Ethoxyacetophenone, hydroxyacetophenone, 2,2-dimethoxy-2'-phenylacetophenone, 2-aminoacetophenone, dialkylaminoacetophenone, etc.

Examples of the benzoin photopolymerization initiator include: dibenzoyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 1-hydroxycyclohexyl phenone, 2-hydroxy 2-methyl Base-1-phenyl-2-methylpropan-1-one, 1-(4-isopropylphenyl)-2-hydroxyl 2-methylpropan-1-one, benzyl dimethyl ketal, etc. .

As the benzophenone-based photopolymerization initiator, benzophenone, benzoylbenzoic acid, methyl benzoylbenzoate, methyl o-benzoylbenzoate (Methyl o-Benzoylbenzoate), 4 - Phenylbenzophenone, hydroxybenzophenone, hydroxypropylbenzophenone, acryloylbenzophenone, 4,4'-bis(dimethylamino)benzophenone, etc.

Thioxanthone-based photopolymerization initiators include thioxanthone, 2-chlorothioxanthone, 2-methylthioxanthone, diethylthioxanthone, and dimethylthioxanthone Ketones etc.

Examples of other photopolymerization initiators include α-acyl oxime esters, benzyl-(o-ethoxycarbonyl)-α-monoxime, acylphosphine oxides, glyoxy esters, coumarin 3 - Ketone, 2-ethylanthraquinone, camphorquinone, tetramethylthiuram sulfide, azobisisobutyronitrile, benzoyl peroxide, dialkyl peroxide, tert-butyl peroxypivalate wait.

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 100% by mass of the total amount of the polymerizable compound. When content of a photoinitiator is 0.005 mass % or more, a polymerizable compound can be polymerized in a short time. When the content of the photopolymerization initiator is 5% by mass or less, residues of the photopolymerization initiator are less likely to remain in the cured product.

In the photocurable resin composition, a crosslinking agent for crosslinking the acrylic polymer may be added as an optional component. The number of functional groups contained in the crosslinking agent is selected according to the desired physical properties of the binder composition, and the addition amount of the crosslinking agent can be adjusted as necessary.

The bifunctional crosslinking agent is not particularly limited as long as it is a compound having two crosslinking reactive functional groups in one molecule. As such a bifunctional crosslinking agent, a bifunctional epoxy compound, a bifunctional isocyanate, etc. are mentioned, for example.

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, 1,6-hexanediol diglycidyl ether and other aliphatic bifunctional epoxy compounds; hydrogenated bisphenol A diglycidyl ether, phthalic acid di Aromatic difunctional epoxy compounds such as glycidyl ester, diglycidyl terephthalate, and resorcinol diglycidyl ether. The epoxy group of the difunctional epoxy compound is capable of cross-linking with the carboxyl group of the acrylic polymer.

Examples of the difunctional isocyanate include aliphatic difunctional isocyanates such as hexamethylene diisocyanate and isophorone diisocyanate (IPDI); and aromatic difunctional isocyanates such as toluene diisocyanate and diphenylmethane diisocyanate. The NCO group of the difunctional isocyanate can cross-link with the carboxyl and hydroxyl groups of the acrylic polymer.

The content of the bifunctional crosslinking agent is in the range of 0.1 equivalent or less relative to the crosslinking point of the acrylic polymer, for example, preferably 0.5 to 3.0 parts by mass, more preferably 1.0 to 3.0 parts by mass.

The number of functional groups is not limited to bifunctional, and in order to adjust the required physical properties (adhesive force, hardness, etc.), a crosslinking agent with more than trifunctional functions can be used.

(adhesive layer)

In the production method of the icon sheet of the present invention, the resin composition constituting the adhesive layer is not particularly limited, but for the adhesiveness between the cured resin layer formed by curing the aforementioned photocurable resin composition, Good, preferably the same type of resin composition as the cured resin layer, for example, a urethane acrylic resin composition is preferably used.

When laminating an adhesive layer made of urethane acrylic resin on a release film, it is preferable to apply a fluid urethane acrylic photocurable adhesive composition on the surface of the release film and irradiate it with light to It is photocured to form a method of adhesive layer.

As the urethane acrylic photocurable adhesive composition for forming the adhesive layer, it is possible to use: a main agent composed of a urethane acrylate polymer and/or a urethane acrylate, an acrylic monomer, and a photopolymerizable A urethane acrylic light-curable adhesive composition prepared by using an initiator as an essential component and adding a crosslinking agent, additives, etc. as needed.

This urethane-acrylic photocurable adhesive composition exhibits adhesiveness during photocuring and is cured to form an adhesive layer.

As each essential component of the main agent, acrylic monomer and photopolymerization initiator made of urethane acrylate polymer and/or urethane acrylate used in the preparation of the aforementioned urethane acrylic photocurable resin composition, and according to The cross-linking agent, additives, etc. that need to be added are made of polyurethane acrylate polymer and/or polyurethane acrylate used in the preparation of the aforementioned polyurethane acrylic light-curable resin composition for forming the adhesive layer. The main ingredient, the essential components of the acrylic monomer and photopolymerization initiator, as well as the crosslinking agent and additives added as needed are prepared from the same materials.

From the perspective of adjusting the adhesive force of the adhesive to the adherend according to the state of the adherend, improving the adhesion when the adherend is a glass plate, and improving the durability of the adhesive layer, etc., in use In the adhesive layer of the icon sheet of the present invention, various additives such as tackifiers, softeners (plasticizers), fillers, anti-aging agents, and silane coupling agents can be added as needed.

Examples of tackifiers include rosin and its derivatives, polyterpenes, terpene phenol resins, coumarone-indene resins, petroleum resins, styrene resins, xylene resins, etc. . Examples of softeners include liquid polyethers, glycol esters, liquid polyterpenes, liquid polyacrylates, phthalates, and trimellitates.

(peel film)

In order to be able to inspect and confirm whether there is adhesion or contamination of impurities or the like when carrying out quality inspection after manufacturing the icon sheet of the present invention, it is preferable that the release film used in the manufacturing method of the icon sheet of the present invention is formed by coating a release treatment agent on a transparent resin film. Release film that undergoes release treatment. It is preferable to use a polyethylene terephthalate (PET) resin film as a transparent resin film from a viewpoint of a relatively cheap price and high transparency. The thickness of the transparent resin film is preferably 10 to 250 μm, more preferably 30 to 200 μm. In addition, the method of the release treatment is not particularly limited, and widely used silicone-based release agents, addition reaction-type silicone-based release agents, and the like can be used.

(icon piece)

The icon sheet of the present invention is produced through the following steps.

Step (1): Use a hard coat film with a hard coat layer formed on one or both sides of the base material, and if the hard coat layer is formed on one side of the base material, then A printing layer consisting of frames and/or icons is formed by printing, and if a hard coat layer is formed on both sides of the substrate, then a frame and/or icon is formed by printing on either side of the hard coat film. The process of the printing layer composed of icons;

Step (2): a step of preparing an adhesive film in which an adhesive layer is formed on the peeled surface of the peeled film;

Step (3): Applying a fluid photocurable resin composition on the surface of the hard coat film on which the printed layer is formed, on the part where the printed layer is not applied, and on the printed layer, A process of laminating photocurable resin layers;

Step (4): The previously prepared adhesive film having an adhesive layer formed on the peeling surface of the peeling film that has been peeled is bonded to the photocurable resin layer through the adhesive layer. on the process;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

In the aforementioned step (4), the photocurable resin composition is formed by pasting the adhesive layer of the adhesive film prepared in advance on the photocurable resin layer composed of the uncured photocurable resin composition. The state of being in close contact with the surface of the adhesive layer. Then, step (5) is performed to cure the photocurable resin layer by irradiating the photocurable resin layer with light. By forming the cured resin layer in this way, it is possible to provide a mixed layer composed of a resin obtained by mixing these resin materials between the cured resin layer and the adhesive layer. By forming a mixed layer between the cured resin layer and the adhesive layer, the interlayer adhesive strength between the cured resin layer and the adhesive layer can be increased, so that peeling between these layers is less likely to occur.

In addition, the icon sheet of the present invention is produced through the following steps.

Step (1): It is a step of preparing a long roll body of a hard coat film, wherein a hard coat film having a hard coat layer formed on one side or both sides of a base material is used, and if the hard coat film is formed on one side of the base material If a hard coat layer is formed on one side of the substrate, a printing layer consisting of frames and/or icons is formed by printing on the other side of the substrate. If a hard coat layer is formed on both sides of the substrate, then the Form a printing layer made of frames and/or icons by printing on any one side of the hard coat film;

Step (2): It is a step of preparing an elongated roll body of the adhesive film, wherein the elongated roll body of the adhesive film is formed with an adhesive layer on the peeling-treated surface of the peeling film to which the peeling process has been applied. binder layer;

Step (3): While rewinding and sending out the elongated roll body of the hard coat film, a part of the hard coat film on which the printed layer is formed is not applied with the printed layer The upper part of the upper part and the upper part of the printing layer, coating a flowable photocurable resin composition, thereby laminating the step of photocurable resin layer;

Step (4): the step of rewinding the elongated roll body of the adhesive film and sending out the adhesive film, and attaching the adhesive layer to the photocurable resin layer through the adhesive layer;

Step (5): a step of curing the photocurable resin layer by irradiating the photocurable resin layer with light.

FIG. 1 is a diagram showing an example of an icon sheet of the present invention.

The icon sheet 1 of the present example is: a hard coat film is laminated on a transparent resin film 2 having a hard coat layer 7, and a printed layer 3 composed of a frame and/or an icon is formed by printing on the hard coat film. On the surface having the printed layer 3, the cured resin layer 4, the adhesive layer 5, and the peeling film 6 are sequentially laminated.

In the icon sheet 1 of the present invention, the thickness of the transparent resin film 2 is preferably in the range of 25 μm to 188 μm, more preferably in the range of 38 μm to 125 μm. If the thickness of the transparent resin film 2 is less than 38 μm, there will be no corresponding optical polyethylene terephthalate (PET) resin film, and the operability in application will significantly deteriorate, which is not preferable. If the thickness of the transparent resin film 2 is more than 188 μm, although it can cope with pencil hardness and prevent indentation, it runs counter to the purpose of reducing the thickness of the final product, so it is not preferable.

In addition, the thickness of the printing layer 3 is preferably in the range of 5 μm to 60 μm, more preferably in the range of 10 μm to 30 μm. When the thickness of the printing layer 3 is less than 5 μm, the color concealment and aesthetics are deteriorated, and when the thickness of the printing layer 3 is greater than 60 μm, the cost will be greatly increased, which is not preferable.

In addition, the thickness of the cured resin layer 4 is preferably in the range of 3 μm to 30 μm, more preferably in the range of 3 μm to 15 μm. When the thickness of the cured resin layer 4 is less than 3 μm, it is necessary to use a harder material in order to exhibit the effect of preventing indentation, but curling due to shrinkage during curing becomes conspicuous, which is not preferable.

In addition, the thickness of the adhesive layer 5 is preferably in the range of 5 μm to 30 μm, more preferably in the range of 10 μm to 25 μm. When the thickness of the adhesive layer 5 is less than 5 μm, it can be seen that the adhesive force and holding force are reduced; when the thickness of the adhesive layer 5 is greater than 30 μm, it is impossible to reduce the weight of the film, and it will also lead to an increase in cost.

Example

Hereinafter, the present invention will be specifically described based on examples.

<Production of Hard Coat Film with Printed Layer>

A hard coat film in which a polyethylene terephthalate (PET) resin film with a thickness of 125 μm is used as a transparent resin film and a hard coat layer is formed on both sides (product name HC7125F-TP, manufactured by DIC Corporation) ). Using a screen printing machine, black pigment ink (HAC series, CONC710BLACK; manufactured by Seiko advance Ltd.) is applied on one side of the hard coat film so that the thickness after drying becomes 15 μm. It was printed and dried to produce a hard coat film A having a printed layer with a black frame and a black frame size of about 115 mm×about 60 mm (the size of the display area in the black frame was about 90 mm×about 53 mm).

In the obtained hard coat film A, the thickness of the printed layer of the black frame was 15 μm, and there was a step height due to the printed layer of the black frame (hereinafter referred to as “the height of the printed step”).

<Production of Optical Adhesive Film (OCA)>

On one side of a polyethylene terephthalate (PET) resin film with a thickness of 50 μm, after peeling with silicone, the thickness after curing is 25 μm, and coated with urethane acrylate as The main component of the urethane acrylate UV-curable adhesive composition (T-470 type, manufactured by Kesuem Co., Ltd.), thereby laminating the adhesive layer. Furthermore, an optically transparent adhesive layer was formed by performing UV irradiation and hardening in nitrogen purging environment. Thereafter, on this optical transparent adhesive layer, a peeling treatment of a polyethylene terephthalate (PET) resin film with a thickness of 38 μm and a release agent layer formed by performing a release treatment with silicone is attached. surface, thereby obtaining the optical adhesive film (OCA) of Example 1.

(Example 1)

Using the aforementioned hard coat film A, a fluid urethane acrylic UV-curable resin composition is applied to the part where the black frame is not formed by the printed layer and the upper part of the black frame formed by the printed layer, so that from the printed layer The thickness calculated on the surface of the transparent resin film of the hard coat film A becomes 10 μm after curing, thereby forming a UV curable resin composition layer, and on this UV curable resin composition layer, peeled off 38 μm The adhesive film for optics behind the thick PET resin film is bonded through the adhesive layer in a way that does not enter air bubbles, and then UV is irradiated to cure the urethane acrylate UV-curable resin composition, thereby obtaining sequential The icon sheet of Example 1 laminated with a photocurable resin layer, an adhesive layer, and a release film.

(Example 2)

The icon sheet of Example 2 was obtained in the same manner as in Example 1, except that a fluid urethane-acrylic UV-curable resin composition different from that of Example 1 was used as the UV-curable resin composition.

(comparative example 1)

Using the above-mentioned hard coating film A, on the part where the black frame is not formed by the printing layer and the upper part of the black frame formed by the printing layer, a fluid UV curable resin composition of urethane acrylate is used to make the black frame from the printing layer The thickness calculated on the surface of the transparent resin film of the hard coat film A of the layer is applied in a manner of 10 μm after curing to form a UV curable resin composition layer, and then UV is irradiated in a nitrogen purging environment to make the UV curable resin The composition was cured to form a UV curable resin layer. The optical adhesive film of Example 1 after peeling off the PET resin film with a thickness of 38 μm was bonded to the UV curable resin layer through the adhesive layer in a manner that no air bubbles entered, thereby obtaining a sequentially laminated optical adhesive film. The icon sheet of Comparative Example 1 of a curable resin layer, an adhesive layer, and a release film.

(comparative example 2)

Using the above-mentioned hard coat film A, on the part where the black frame is not formed by the printing layer and on the upper part of the black frame formed by the printing layer, a fluid urethane acrylate UV curable resin composition is applied to make the black frame from the printing layer The thickness calculated on the surface of the transparent resin film of the hard coat film A of the layer was applied so as to be 10 μm after curing, thereby forming a UV curable resin composition layer. The release-treated surface of a polyethylene terephthalate (PET) resin film with a thickness of 38 μm is attached to the UV-curable resin composition layer, and then UV-irradiated to combine the urethane acrylate-based UV-curable resin The material is cured to form a UV curable resin layer. The optical adhesive film of Example 1 after peeling off the PET resin film with a thickness of 38 μm was attached to the aforementioned UV-curable resin layer through the adhesive layer in a manner that no air bubbles entered, and then UV irradiation was performed to make the polyurethane The acrylate-based UV-curable resin composition was cured to obtain the icon sheet of Comparative Example 2 in which a photocurable resin layer, an adhesive layer, and a peeling film were sequentially laminated.

(comparative example 3)

Using the above-mentioned hard coat film A, on the upper part of the part where the black frame is not formed by the printed layer, and the upper part of the black frame formed by the printed layer, the optical bonding of Example 1 after peeling off the PET resin film with a thickness of 38 μm The films were bonded through the adhesive layer so that air bubbles did not enter, and the icon sheet of Comparative Example 3 in which the adhesive layer and the peeling film were laminated in this order was obtained.

(Confirmation test of air bubbles after lamination)

Using a laminating device (the product name is a small single-piece laminating machine (small leaf laminating machine), the model is SE320; manufactured by CLIMB PRODUCTS CO., LTD.), the produced examples 1, 2 and comparative example 1 The icon sheet of , 2 is attached to the ITO surface of a glass plate on which an ITO film (product name "Metafos" 125R2×A, surface resistance value 250Ω/m ² ; manufactured by Nakai Kogyo Co., Ltd.) is pasted with an adhesive tape superior.

(indentation test)

A pencil hardness test was implemented in accordance with K5400-1 using the sample produced in the air bubble confirmation test after bonding, except that the set load was 1 kg. As a result, in Examples 1 and 2 and Comparative Example 1, when the pencil hardness test was performed on the unprinted portion, the pencil hardness satisfied 2H, and no indentation was confirmed visually in the portion drawn with a pencil. However, in Comparative Example 2, although the pencil hardness satisfied 2H, occurrence of indentation was confirmed by visual inspection.

(damp heat test)

Using a laminating device (the product name is a small single-chip laminating machine (small leaf laminating machine), the model is SE320; manufactured by CLIMB PRODUCTS CO., LTD.), the produced examples 1, 2 and comparative example 1 The hard coat film of ~3 was attached to the glass plate.

The sample with the icon sheet and glass attached was placed in an environment of 85°C×85%Rh for 240 hours, and the peeled interface was confirmed after taking it out.

When left standing, the icon sheets of Example 1, Example 2, and Comparative Examples 1 to 3 had no appearance problems such as separation and peeling.

When the icon sheet was forcibly peeled from the glass, the icon sheet of Example 1 and Example 2 did not peel off at the interface between the coating layer and the adhesive layer. However, in the icon sheets of Comparative Example 1 and Comparative Example 2, peeling occurred at the interface between the coating layer and the adhesive layer. In addition, in the icon sheet of Comparative Example 3, peeling occurred at the interface between the hard coat film and the adhesive layer.

Table 1

The icon sheet of embodiment 1 and embodiment 2 is: in the upper part of the part that is not applied with the printed layer and the upper part of the printed layer in the surface of the hard coat film on which the printed layer is formed, a fluid urethane acrylic photocurable type coating is applied. resin composition to laminate a photocurable resin layer, and, on the aforementioned photocurable resin layer, an adhesive bonded on which an adhesive layer is formed on the peeling surface of a peeling film that has been peeled. The film is bonded through the adhesive layer, and then irradiated with light to cure the photocurable resin layer, thereby stacking the icon sheet of the photocurable resin layer, the adhesive layer, and the release film in this order.

In the icon sheet obtained in this Example 1 and Example 2, it was possible to bond without generating air bubbles at the part having the printed step between the transparent resin film and the black frame of the printed layer.

However, in the icon sheets of Comparative Example 1 and Comparative Example 2, a fluid urethane acrylic gloss was applied to the upper part of the part where the printed layer was not applied and the upper part of the printed layer on the surface of the hard coat film on which the printed layer was formed. After laminating a photocurable resin layer using a curable resin composition, light was irradiated to form a photocurable resin layer, and an adhesive film was bonded to form an icon sheet. In this icon sheet, the printing level difference of the portion having the printing level difference between the transparent resin film and the black frame of the printed layer could not be filled, and air bubbles were generated.

In addition, in the icon sheet of Comparative Example 3 in which only the adhesive film was bonded to the hard coat film having the printed layer, it was not possible to fill the printed step of the part having the printed step between the transparent resin film and the black frame of the printed layer. , producing bubbles.

In addition, in the icon sheet of Comparative Example 3, although the subsequent pressure cooker treatment (40°C x 0.5mMPa x 15 minutes) can reduce the overall generation of air bubbles, a large amount of bubbles that can be visually recognized remains. bubble.

Industrial Applicability

The present invention relates to an icon sheet having less distortion due to printing steps, less air bubbles remaining, less indentation under load, and less peeling of an adhesive layer, and a touch panel using the icon sheet. The icon sheet of the present invention can be preferably used as a splash-proof film for protecting a touch panel, or as an icon sheet bonded to the ITO surface of a capacitive touch panel.

Claims (5)

1. a manufacture method for icon sheet, is the manufacture method at the one side of hard coat film with the icon sheet of printed layers and adhesive layer, at least comprises:

Operation (1): be used in a face of base material or the two-sided hard coat film being formed with hard coat, if be formed with hard coat on a face of described base material, then on another face of this base material, form by printing the printed layers be made up of frame and/or icon, if be all formed with hard coat the two-sided of described base material, then on any one face of described hard coat film, formed the operation of the printed layers be made up of frame and/or icon by printing;

Operation (2): prepare the operation being formed with the adhesive film of adhesive layer on this lift-off processing face of the stripping film applying lift-off processing;

Operation (3): on the top being formed with the part not being applied with described printed layers in the face of described printed layers of described hard coat film and the top of described printed layers, coating has the photocurable resin composition of mobility, thus the operation of stacked photocurable resin layer;

Operation (4): by pre-prepd, be formed with adhesive layer on this lift-off processing face of stripping film applying lift-off processing adhesive film, be fitted in the operation on described photocurable resin layer by described adhesive layer;

Operation (5): carry out rayed by this photocurable resin layer from the top of described adhesive film being fitted in described photocurable resin layer top, coating being laminated in the top of the part not being applied with described printed layers and the top of described printed layers and described photocurable resin layer is solidified, thus form the operation of mixolimnion between photocurable resin layer and adhesive layer.

2. a manufacture method for icon sheet, is the manufacture method at the one side of hard coat film with the icon sheet of printed layers and adhesive layer, at least comprises:

Operation (1): it is the operation of the strip roll body preparing hard coat film, wherein, be used in a face of base material or the two-sided hard coat film being formed with hard coat, if be formed with hard coat on a face of described base material, then on another face of this base material, form by printing the printed layers be made up of frame and/or icon, if be all formed with hard coat the two-sided of described base material, then on any one face of described hard coat film, form by printing the printed layers be made up of frame and/or icon;

Operation (2): it is the operation of the strip roll body preparing adhesive film, and wherein, the strip roll body of described adhesive film is formed with adhesive layer on this lift-off processing face of stripping film applying lift-off processing;

Operation (3): the strip roll body of described hard coat film to be reeled again and while sending, on the top being formed with the part not being applied with described printed layers in the face of described printed layers of described hard coat film and the top of described printed layers, coating has the photocurable resin composition of mobility, thus the operation of stacked photocurable resin layer;

Operation (4): the strip roll body of described adhesive film is reeled again and the described adhesive film sent, fit in the operation on described photocurable resin layer by described adhesive layer;

Operation (5): carry out rayed by this photocurable resin layer from the top of described adhesive film being fitted in described photocurable resin layer top, coating being laminated in the top of the part not being applied with described printed layers and the top of described printed layers and described photocurable resin layer is solidified, thus form the operation of mixolimnion between photocurable resin layer and adhesive layer.

3. an icon sheet, wherein, adopts the manufacture method of the icon sheet described in claim 1 or 2 to obtain.

4. a contact panel, wherein, is fitted with icon sheet according to claim 3 by described adhesive layer.

5. an electronics, wherein, is assembled with contact panel according to claim 4.