KR20140010882A - Hard coat film and touch panel using the same - Google Patents

Abstract

The present invention provides a hard coated film which has small optical distortion attributed to a height difference in print and has less residual bubbles and in which dent is hardly formed when load is added, and to a touch panel using the same. In the hard coated film: a hard coated layer is formed on one surface of a transparent resin film; a black frame and/or a printed layer of an icon is formed on the other surface; an adhesive layer, which is formed by hardening the UV curing resin composition with liquidity which includes a photopolymerization initiator, is laminated on the upper part of the other surface on which the printed layer is not formed and on the upper part of the printed layer; and the difference between the thickness of the adhesive layer and the thickness of the printed layer is smaller than the thickness of the printed layer. The hard coated film is formed by laminating an exfoliated film on the adhesive layer.

Description

Hard coat film and touch panel using it {HARD COAT FILM AND TOUCH PANEL USING THE SAME}

TECHNICAL FIELD The present invention relates to a hard coat film having a small optical distortion due to a printing step, a small bubble remaining, and hardly occurring when a load is applied, and a touch panel using the same.

In addition, in this specification, a printing step | step refers to the thickness of a printing layer from the surface of a base material in the state in which the black frame and / or the printing layer of the icon were formed in the surface of the base material which consists of a transparent resin film.

In addition, in this specification, the hard-coat film which has a hard-coat layer in one side of a transparent resin film, and the printed layer of a black frame and / or an icon was formed in the other side is a hard-coat layer, a transparent resin film, a black frame, / Or it is set as the structure laminated | stacked on the upper side in order of the printing layer of an icon.

Conventionally, the touch panel which bonded together the hard-coat film by which the icon which instructed the operation method is printed on the surface of a touch panel is known (for example, refer patent document 1, 2).

As a display (display apparatus) to which a touch panel is applied, a liquid crystal display (LCD), an electroluminescent display (inorganic EL, organic EL), etc. are mentioned, As a specific electronic apparatus which this touch panel is used, a liquid crystal television , A mobile terminal, a mobile phone, an electronic paper, an electronic book terminal, a personal computer, and the like.

By the way, in patent document 1, when bonding the hard-coat film which printed the icon with a pressure-sensitive adhesive, if the step | step between the icon printed part and the periphery shall be 5 micrometers or less, the generation | occurrence | production of an air bubble will be prevented at the time of bonding. It can be said.

Further, in bonding the hard coat film on which the icon instructing the operation method is printed on the surface of the touch panel, various studies have been attempted to prevent the mixing of bubbles caused by the presence of the printing step of the icon. For example, refer patent documents 3-7).

Moreover, patent document 8, 9 discloses the manufacturing method of the image display panel which coated the decorative layer on the back surface of the transparent panel board | substrate which performs image display. The separator is continuously filled with an ultraviolet curable resin or a thermosetting resin on the inner side of the step of the decorative layer on the rear surface of the panel substrate, and then coated with a separator film coated with a release agent on the upper surface of the cured resin. After pressurizing a film to the cured resin side, and performing UV irradiation, the separator film is peeled and the image display panel is manufactured.

Japanese Laid-Open Patent Publication 2003-036143 Japanese Laid-Open Patent Publication 2004-213187 Japanese Unexamined Patent Publication No. 2009-098324 Japanese Unexamined Patent Publication No. 2010-176111 Japanese Unexamined Patent Publication No. 2010-072471 Japanese Unexamined Patent Publication No. 2010-097070 Japanese Unexamined Patent Publication No. 2010-239324 Japanese Laid-Open Patent Publication 2012-22281 Japanese Laid-Open Patent Publication 2012-22210

However, in the display device described in Patent Literature 3, bonding a light transmitting member (corresponding to a hard coat film) on the surface of the touch panel via an adhesive layer and an adhesive layer requires additional labor, causing a cost increase. Therefore, there is a problem that it cannot be employed in an inexpensive display device. Moreover, in the display apparatus of patent document 3, although the light shielding layer of thickness about 5-10 micrometers is formed so that the outer periphery of a liquid crystal device may be formed, an adhesive bond layer and an adhesive layer are not so influenced by the printing step of a light shielding layer. The area of is excreted.

In addition, Patent Document 4 discloses that a step between a transparent protective plate made of an acrylic resin or a polycarbonate resin and a printing portion is filled with a transparent resin to be flattened, and that the protective plate is bonded to the display surface with a double-sided tape or an adhesive having transparency. have.

According to patent document 4, it is said that it is preferable to make the film thickness of photocurable resin into the film thickness twice or more of the thickness of a printing layer, but the detail of the planarization method performed using photocurable resin is not described in detail.

In addition, Patent Document 5 discloses bonding a surface protective layer (corresponding to a protective film) having a light shielding layer (corresponding to a printed layer of an icon) on the surface of a touch panel via an adhesive layer having a specific storage elastic modulus. . It is said that air bubbles are not generated when the pressure-sensitive adhesive layer is used. However, after bonding the surface protective layer to the touch panel, the pressure-sensitive adhesive is cured by irradiating ultraviolet rays from the surface protective layer or the opposite side of the touch panel. Ultraviolet rays are not fully irradiated.

In addition, Patent Document 6 discloses bonding a surface transparent plate (corresponding to a protective film) having a black printing layer (corresponding to a printing layer of an icon) on the surface of a touch panel via a transparent adhesive sheet having a specific storage elastic modulus. It is.

It is supposed that bubbles are not generated in the adhesive surface between the liquid crystal display panel and the plastic plate (protective transparent plate). However, since the protective transparent plate which consists of transparent plastics is bonded together via a transparent adhesive sheet to a liquid crystal panel, it cannot avoid that a bubble remains in the corner part which the step of the black printing layer produced.

In addition, Patent Document 7 discloses bonding a design panel having an outer frame to a touch panel via a double-sided tape.

Since the bonding surface of a double-sided tape becomes substantially planar as a whole, it is said that an air bubble does not arise between a design panel and a double-sided tape. However, since the design panel is bonded to the touch panel via the double-sided tape, it is inevitable that bubbles remain in the corner portion where the step of the printing layer of the outer frame portion occurs.

In addition, although the image display panels disclosed in Patent Documents 8 and 9 can reduce the generation of bubbles, the obtained panels are likely to cause dents when a load is applied.

In addition, since such an image display panel uses OCA (Optical Clear Adhesive) when bonding a light transmitting member, the process is increased, resulting in a decrease in quality and a decrease in yield. In addition, since the OCA is produced in a separate process, the manufacturing cost of the image display panel is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a hard coat film and a touch panel using the same, which have less optical distortion due to printing step, less residual bubbles, and are less likely to cause pitting even when a load is applied. It is a task.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, this invention consists of having a hard-coat layer in one side of a transparent resin film, the black layer and / or the printing layer of an icon are formed in the other side, and the said printing of the other side The pressure-sensitive adhesive layer formed by curing the photocurable resin composition having a fluidity property containing a photopolymerization initiator on the upper portion of the portion where no layer is not formed and the printing layer is laminated, and the release film subjected to the peeling treatment on the pressure-sensitive adhesive layer is A hard coat film is formed which is bonded to each other and has a smaller thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer than the thickness of the printing layer.

In addition, the present invention has a hard coat layer on both sides of the transparent resin film, a black frame and / or a printed layer of the icon is formed on the hard coat layer on one side, the print layer is formed of one side The pressure-sensitive adhesive layer formed by curing the photocurable resin composition containing a photopolymerization initiator on the upper portion of the portion where the hard coat layer is not exposed and the upper portion of the portion on which the printing layer is formed is laminated, and A peeling film subjected to the peeling treatment on the pressure-sensitive adhesive layer is bonded to each other, and a hard coat film having a smaller thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer than the thickness of the printing layer is provided.

In the hard coat film of this invention, the urethane acrylic photocurable adhesive composition which the said photocurable adhesive composition consists of a urethane acrylic polymer and / or a urethane acrylate main body, an acryl-type monomer, a crosslinking agent, and a photoinitiator. Is preferably.

In the hard coat film of this invention, it is preferable that the thickness of the said transparent resin film is 25 micrometers-125 micrometers, and the thickness of an adhesive layer is 15 micrometers-28 micrometers, and the thickness of a printing layer is thinner than the thickness of an adhesive layer. .

In addition, the present invention provides a touch panel in which the hard coat film is bonded through the pressure-sensitive adhesive layer.

In addition, the present invention provides an electronic device having the touch panel embedded therein.

The hard coat film of the present invention has a hard coat layer on one or both sides of the transparent resin film, a print layer is formed on the other side or the hard coat layer, and the print layer is formed among the surfaces on which the print layer is formed. The pressure-sensitive adhesive layer formed by curing the photocurable resin composition having a fluidity property containing a photopolymerization initiator is laminated on the upper portion of the portion not provided and the portion where the printing layer is formed, and the release film subjected to the peeling treatment on the pressure-sensitive adhesive layer is It is formed by bonding, and the thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer is smaller than the thickness of the printing layer, so that there is less optical distortion due to printing step, and fewer bubbles remain. Even if a load is applied, the hard coat film which is hard to produce a patch can be provided.

In addition, since the difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer is in a state where the difference in thickness is smaller than the thickness (printing step) of the printing layer, the surface of the hard coat layer has a reduced physical uneven shape. .

In addition, the hard coat film according to the present invention can fill the printing step irrespective of the flexibility of the pressure-sensitive adhesive layer, so that not only the flexible pressure-sensitive adhesive layer having enhanced adhesive strength, but also the hard re-peelable pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer can be transferred. A pressure-sensitive adhesive layer having an unadhesive force having very hard physical properties such as no one can be used.

Moreover, the hard coat film of this invention can be used suitably as a scattering prevention film used for the protection of a touch panel, and an icon sheet bonded to the ITO surface of a capacitive touch panel.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows an example of the hard coat film of this invention.

EMBODIMENT OF THE INVENTION Hereinafter, preferable embodiment of this invention is described.

The hard coat film of the present invention has a hard coat layer on one side of the transparent resin film, and is formed by forming a black frame and / or an icon printing layer on the other side, wherein the print layer is formed on the other side. The adhesive layer which hardens the photocurable resin composition which has the fluidity | liquidity containing a photoinitiator on the upper part of the part which is not formed, and the part in which the said printing layer is formed is laminated | stacked, and the peeling process peeled on the said adhesive layer The film is bonded to each other, and the thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer is smaller than the thickness of the printing layer. The hard coat film of the present invention has a hard coat layer on both sides of the transparent resin film, and a black frame and / or a printed layer of an icon is formed on the hard coat layer on one side thereof. Adhesive layer formed by hardening | curing the photocurable resin composition which has the fluidity | liquidity containing a photoinitiator in the upper part of the part in which the said hard-coat layer which the said printing layer is not formed, and the part in which the said printing layer is formed. The laminated film is formed by bonding a release film peeled off on the pressure-sensitive adhesive layer, and the thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer is smaller than the thickness of the printing layer. Coat film.

(Transparent resin film)

As a transparent resin film used for the hard coat film of this invention, it has transparency made from a polyethylene terephthalate (PET) resin film, a polyethylene terephthalate (PEN) resin film, and a cyclic polyolefin (COP) type resin film, and is heat-resistant It is preferable that it is 1 type selected from the group of resin films. In particular, a polyethylene terephthalate (PET) resin film is suitably used in view of 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. When the thickness of a transparent resin film is thinner than 10 micrometers, since handleability is lacking, it is not preferable. Moreover, when the thickness of a transparent resin film is thicker than 250 micrometers, transparency falls, cost becomes high, and processing suitability in the manufacturing process of a hard coat film worsens, and it is unpreferable. From the above point, 10-250 micrometers is preferable and, as for the thickness of a transparent resin film, 30-200 micrometers is more preferable. Moreover, in order to improve the adhesiveness of a transparent resin film and a hard-coat layer, it is possible to laminate a suitable easily easy resin layer on the surface of a transparent resin film, and to perform surface treatments, such as a flame treatment, a corona treatment, and a plasma treatment. You may also Moreover, you may form a base layer between a transparent resin film and a hard-coat layer.

(Pressure-sensitive adhesive layer)

The hard coat film according to the present invention has a hard coat layer on one side of the transparent resin film, and is formed by forming a black frame and / or an icon print layer on the other side, wherein the print layer of the other side is An adhesive layer is formed in the upper part of the part which is not formed. In addition, the hard coat film which concerns on this invention has a hard-coat layer in the both surfaces of a transparent resin film, and the black layer and / or the printed layer of an icon are formed on the said hard-coat layer of one side, The said one side The adhesive layer is formed in the upper part of the part in which the said hard-coat layer in which the said printing layer is not formed is exposed. Furthermore, it is preferable that the adhesive layer is also formed in the upper part of the black layer and / or the printing layer of an icon. In order to form this adhesive layer, urethane acrylic photocurable adhesive compositions, such as a solvent type acrylic polymer, a solvent type acrylic syrup, a solventless acrylic syrup, and a solventless urethane acrylate, can be used.

(Acrylic polymer)

The solvent type acrylic polymer can use at least 1 sort (s) of the alkyl (meth) acrylate represented by following General formula [Formula 1] as an acryl-type monomer used as a raw material. It is preferable that a hydrophilic monomer is copolymerized. This is because a higher functional acrylic pressure-sensitive adhesive layer can be formed by curing the acrylic polymer with a crosslinking agent such as isocyanate or epoxy resin.

(Wherein R ¹ represents hydrogen or methyl group, R ² represents an alkyl group having 1 to 14 carbon atoms)

With alkyl (meth) acrylate represented by the general formula CH ^₂ = CR ¹ -COOR ₂ are, 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) acryl The rate, dodecyl (meth) acrylate, etc. are mentioned, These can be used individually or in combination of 2 or more types. Among these, 2-ethylhexyl (meth) acrylate and n-butyl (meth) acrylate are used preferably.

The alkyl (meth) acrylate has 1 to 14 carbon atoms of the alkyl group R ² from the viewpoint of adhesive force. Since the adhesive force may fall that carbon number of an alkyl group is 15 or more, it is unpreferable. The alkyl group R ² preferably has 1 to 12 carbon atoms, more preferably 4 to 12 carbon atoms, and most preferably 4 to 8 carbon atoms.

In addition, among the alkyl (meth) acrylates having 1 to 14 carbon atoms of the alkyl group R ² , alkyl (meth) acrylates having 1 to 3 or 13 to 14 carbon atoms of the alkyl group R ² may be used as part of the monomer. It is preferable to use essentially the alkyl (meth) acrylate of 4-12 carbon atoms of R <^2> (for example, 50-100 mol%). In addition, these alkyl groups R ² may be linear or branched.

In order to superpose | polymerize an alkyl (meth) acrylate, although it can carry out by well-known methods, such as solution polymerization, block polymerization, suspension polymerization, emulsion polymerization, solution polymerization which is easy to remove heat is used suitably. Specific examples of the organic solvent used in the solution polymerization reaction include aromatic hydrocarbons such as toluene and xylene, aliphatic esters such as ethyl acetate and butyl acetate, alicyclic hydrocarbons such as cyclohexane, and hexane. Although aliphatic hydrocarbons, such as a pentane, etc. are mentioned, It will not specifically limit, if the said polymerization reaction is not inhibited. One type of these solvents may be used, or two or more types may be mixed and used. What is necessary is just to determine the usage-amount of a solvent suitably.

In general, in the solution polymerization reaction, the molecular weight of the polymer produced decreases as the polymerization temperature increases. In carrying out the polymerization reaction at the reflux temperature of the solvent, a polymer can be obtained while removing the heat of polymerization reaction by using a solvent having a boiling point temperature suitable for the polymerization reaction.

(Acrylic syrup)

The solvent-based acrylic polymer may be an acrylic syrup which is obtained by adding an acrylic monomer as shown in the above structural formula [Formula 1] and irradiating and curing UV or the like after coating or film formation as it is. By adding a monomer, for example, it becomes possible to have a cloudiness prevention effect in the durability test at high temperature and high humidity, and it becomes possible to give the function which is not expressed only by an acryl-type polymer. Even if it is the same acrylic syrup, you may coat with an organic solvent which does not use an organic solvent for a polymerization reaction, or removes the organic solvent used after a polymerization reaction, to make it a solventless acrylic syrup.

In consideration of productivity and processing aptitude, a UV curable pressure-sensitive adhesive composition is more suitable than a solvent-based pressure-sensitive adhesive composition. In the case of the solvent-based pressure-sensitive adhesive composition, the equipment for volatilizing the solvent and the processing time for volatilizing the solvent are required, and the thickness of the pressure-sensitive adhesive layer after drying becomes thinner by the loss due to evaporation of the solvent with respect to the thickness of the coated pressure-sensitive adhesive layer. Shrinkage in the thickness direction is large (solvent cutback). Therefore, the display portion has a larger absolute value of the thickness shrinkage than the print portion of the black frame, and reducing the thickness difference between the display portion and the printed portion after coating the adhesive layer aimed at the present invention bonds the adhesive tape. Although it improves rather than the case, it becomes easy to produce the thickness difference by solvent cutback powder. In order to reduce the thickness difference due to solvent cutback as much as possible, it is preferable to reduce the solvent content in the pressure-sensitive adhesive composition, and further eliminate the solvent component. Therefore, in this invention, it is preferable to use solventless types, such as a solventless acrylic syrup and a solventless urethane acrylate, for the subject of an adhesive composition.

(Urethane acrylate)

The urethane acrylate is, for example, a compound having one or more (meth) acryl groups in one molecule obtained by reacting two or more moles of hydroxyl group-containing acrylic monomers with one mole of a compound having two or more NCO groups in one molecule. Can be mentioned. Here, as a hydroxyl-group containing acryl-type monomer, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, polyethyleneglycol mono (meth) And hydroxyl group-containing (meth) acrylates such as acrylate, polypropylene glycol mono (meth) acrylate, and cyclohexanedimethanol mono (meth) acrylate.

Moreover, as a compound which has two or more NCO groups in 1 molecule, the oligomer whose molecular weight obtained by making polyisocyanate compounds, such as diisocyanate, and polyol compounds, such as a diol, react is about 500-50000 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, Polyether diols such as polypropylene glycol, polytetramethylene glycol and polyhexamethylene glycol; polyesters obtained by reacting the diol with dibasic acids such as phthalic acid, isophthalic acid, terephthalic acid, maleic acid, fumaric acid, adipic acid and sebacic acid Type diol etc. are mentioned.

Moreover, in the adhesive composition of this invention, at least 1 type of (meth) acrylate may be contained in at least 1 type of urethane acrylate. Other monomers may also be added as long as the effects of the present invention are not impaired. As the (meth) acrylate, for example, alkyl represented by the general formula CH ₂ = CR ¹ -COOR ² (wherein R ¹ represents hydrogen or a methyl group and R ² represents an alkyl group having 1 to 14 carbon atoms) Acrylic monomers, such as meth) acrylate, are mentioned. With alkyl (meth) acrylate represented by the general formula CH ^₂ = CR ¹ -COOR ₂ are, 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) acryl The rate, dodecyl (meth) acrylate, etc. are mentioned, These can be used individually or in combination of 2 or more types. Among these, 2-ethylhexyl (meth) acrylate and n-butyl (meth) acrylate are used preferably. In addition, these alkyl groups R ² may be linear or branched. In addition, as a non-acrylic-type monomer containing an alkoxy silyl group, vinyl methoxysilane, vinyl trimethoxysilane, etc. are mentioned, for example.

In addition, various compounds such as non-acrylic monomers can be used. As for the addition monomer, the monofunctional monomer which has one photopolymerizable group, such as a (meth) acryl group and a vinyl group, per molecule is preferable.

Although the adhesive composition used by this invention contains at least 1 type of an acryl-type monomer as a role of the diluent which lowers a viscosity at the time of application | coating process, when an acrylic monomer component is added too much, since the amount of UV irradiation needs to be increased, an acryl-type It is preferable to make the addition amount of a monomer 50 mass% or less of a resin component, More preferably, it is 30 mass% or less.

In addition, in the solvent-based acrylic polymer and the solvent-based acrylic syrup, an organic solvent remains in the resin, so that the remaining organic solvent may cause fouling with respect to the printed layer of the hard coat film having the black layer printed layer. . Therefore, it is necessary to raise solvent resistance in advance for the coating material of the printing layer using a UV curing agent or a crosslinking agent.

Moreover, since urethane acrylate type UV curable resin and an acrylic syrup add polymerization photopolymerization initiator and the ultraviolet light contained in room light or sunlight acts on an acrylic syrup, a polymerization reaction may advance and management becomes difficult, It is preferable to add a photoinitiator just before possible as soon as possible of the application | coating process which is a subsequent process. This is similarly handled in the resin solution in which the acrylic syrup is dissolved in the organic solvent, and care should be taken to prevent the photopolymerization initiator from starting the reaction before coating or film forming due to any external factor.

(Hard coat layer)

In the hard coat film of this invention, the hard coat layer formed in a transparent resin film should just be hard-coat property enough to be used as a surface material of a touch panel, and if a measured value is 2H or more in a pencil hardness test normally, there is no problem practically. . There is no restriction | limiting in particular in resin used for a hard-coat layer, Thermosetting hard-coat resin, such as silicone type and a melamine type, UV-curable hard coat resin, such as silicone type, an acryl type, etc. 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. In the case where the hard coat layer is formed on only one side of the transparent resin film, warpage or deformation due to thermal expansion tends to occur, so that the cost is prioritized over the performance, except that a cheap hard coat film is required. It is preferable to form a hard coat layer on both surfaces of a film.

Moreover, 1-10 micrometers is preferable and, as for the thickness of a hard-coat layer, 2-8 micrometers is more preferable. When the thickness of the hard coat layer is thinner than 1 µm, hard coat properties cannot be obtained, and scratch resistance is reduced, and curing failure is easily caused when an ultraviolet curable hard coat resin is used.

In addition, when the thickness of the hard coat layer is thicker than 10 µm, cracks tend to occur in the hard coat layer, and the hard coat film itself tends to curl, which is not preferable.

In addition, 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 of forming a hard coat layer on the surface of a transparent resin base material, the conventionally well-known method, such as a reverse coat method, the die coat method, and the gravure coat method, can be used.

In addition, when a printing layer and an adhesive layer are laminated | stacked on a hard-coat layer, in order to improve the adhesiveness of a hard-coat layer, a printing layer, and an adhesive layer, the base layer of a suitable adhesiveness on the surface of a hard-coat layer is suitable. You may perform lamination, surface treatment, such as a flame treatment, a corona treatment, and a plasma treatment.

(Printed layer of black frame and / or icon)

The present invention has a hard coat layer on one side of a transparent resin film, a black frame and / or an icon printed layer is formed on the other side, and the other side of the portion where the print layer is not formed. It is related with the hard-coat film in which the adhesive layer for bonding to a touchscreen etc. is formed in the upper part. In addition, the present invention has a hard coat layer on both sides of the transparent resin film, a black frame and / or a printed layer of the icon is formed on the hard coat layer on one side, the print layer is formed of one side It is related with the hard-coat film in which the adhesive layer for bonding to a touchscreen etc. is formed in the upper part of the part in which the said hard-coat layer which is not made is exposed.

In the hard coat film according to the present invention, the black frame formed by the printing layer suppresses the illumination light emitted from the display panel (backlight of the liquid crystal panel, etc.) provided behind the touch panel from leaking from around the display panel. Therefore, it is provided in order to shield the periphery of a display panel. In addition, the icons formed by the printed layer are fixedly frequently used among icons (displays of patterns, characters, symbols, etc. for inputting or selecting specific functions, operations, items, etc.) displayed on the screen of the touch panel. It is installed to display.

Formation of the black frame and / or icon by a printing layer is performed by apply | coating and drying the coating material which consists of a resin composition containing a light-shielding black pigment by screen printing, intaglio printing, etc., and forming a light-shielding film. 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, in particular, carbon black is suitably used. The distribution range of the preferable particle diameter of a black pigment (light absorbing material) is the range of 0.01-0.5 micrometer, More preferably, it is the range of 0.05-0.3 micrometer. In addition, in order to adjust the color tone of a light shielding layer to achromatic color or a preferable color tone, you may use a plurality of different color materials as needed. In addition, in order to form a black frame by a printing layer, for example, the black frame can be formed by using the acrylic resin paint which disperse | distributed carbon black as a black pigment, and making the film thickness of a printing layer into 10-50 micrometers. Can be. It is not necessary to limit this print layer to black, and it is possible to select various colors, such as glossy resin, white, and various hue colors.

By the way, the hard-coat film of this invention has a hard-coat layer on one side of a transparent resin film, and the black layer and / or the printing layer of an icon are formed in the other side, The said printing layer among the other surfaces The pressure-sensitive adhesive layer made of a photocurable resin composition containing a photopolymerization initiator is formed on the upper portion of the portion not yet formed, and furthermore, on the upper portion of the print layer of the frame and / or the icon. The hard coat film of the present invention has a hard coat layer on both sides of the transparent resin film, and a black frame and / or a printed layer of an icon is formed on the hard coat layer on one side thereof. The adhesive layer which consists of a photocurable resin composition containing a photoinitiator is formed also in the upper part of the part in which the said hard-coat layer with which the said printing layer is not formed is exposed, and also the upper part of the printing layer of a frame and / or an icon. It is.

Therefore, in the work process of pasting the hard-coat film of this invention to a to-be-adhered body, in order to prevent dust etc. from adhering to a surface of an adhesive layer, and to deteriorate, in order to prevent it from being damaged, the adhesive layer is carried out on the adhesive layer until just before bonding to a to-be-adhered body. It is preferable to laminate | stack and store the peeling film (also called protective film) which carried out the peeling process to the surface of a base material. In addition, when laminating | stacking a peeling film on the adhesive layer of the hard-coat film of this invention, it will become a factor of a cost increase, but it is preferable that the hard-coat film of this invention is shipped in the state which bonded the peeling film on the adhesive layer. Do. When the release film is subjected to the quality inspection after producing the hard coat film of the present invention, the release film is applied by peeling treatment agent to the transparent resin film so that peeling treatment is carried out so that adhesion of dust or the like can be checked and checked. desirable. As a transparent resin film, a polyethylene terephthalate (PET) resin film is used suitably from the point that a price is comparatively cheap and high transparency. 10-250 micrometers is preferable and, as for the thickness of a transparent resin film, 30-200 micrometers is more preferable. In addition, the method of peeling process is not specifically limited, You may use the silicone type | system | group peeling agent, addition reaction type | mold silicone type | system | group peeling agent which are already widely used.

(Crosslinking agent)

In order to crosslink an acrylic polymer as an arbitrary component, you may add a crosslinking agent to the photocurable resin composition used for the hard coat film of this invention. The number of groups of the functional group contained in the crosslinking agent is selected by the physical properties of the required pressure-sensitive adhesive composition, and it is possible to adjust the addition amount of the crosslinking agent as necessary.

As a bifunctional crosslinking agent, if it is a compound which has two functional groups in crosslinking reaction in 1 molecule, it will not specifically limit. As such a bifunctional crosslinking agent, a bifunctional epoxy compound, a bifunctional isocyanate, etc. are mentioned, for example.

Examples of the bifunctional epoxy compound include ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, dipropylene glycol diglycidyl ether, Aliphatic difunctional epoxy compounds such as polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, hydrogenated bisphenol A diglycidyl ether, o Aromatic difunctional epoxy compounds, such as diglycidyl ether of a phthalate, diglycidyl ether of a terephthalate, and a resorcin diglycidyl ether, are mentioned. The epoxy group of the bifunctional epoxy compound can crosslink react 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 tolylene diisocyanate and diphenylmethane diisocyanate. The NCO group of the bifunctional isocyanate can crosslink react with the carboxyl group and the hydroxyl group of the acrylic polymer.

0.5-3.0 mass parts is preferable with respect to 100 mass parts of acrylic polymers, and, as for content of a bifunctional crosslinking agent to 0.1 equivalent or less with respect to the crosslinking point of an acrylic polymer, 1.0-3.0 mass parts is more preferable.

The number of functional groups is not limited to bifunctional, and it is possible to use a trifunctional or higher crosslinking agent in order to adjust the necessary adhesive properties (adhesive force, hardness, etc.).

(additive)

In the adhesive layer used for the hard coat film of this invention, adjusting the adhesive force with respect to the to-be-adhered body of an adhesive according to the to-be-adhered state, improving adhesive force when a to-be-adhered body is a glass plate, and improving durability of an adhesive layer It is also possible to add various additives, such as a tackifier, a softener (plasticizer), a filler, an antioxidant, and a silane coupling agent, from a viewpoint of things, etc. as needed.

Examples of the tackifier include rosin and its derivatives, polyterpenes, terpene phenol resins, coumarone-indene resins, petroleum resins, styrene resins and xylene resins. As a softening agent, liquid polyether, glycol ester, liquid polyterpene, liquid polyacrylate, phthalic acid ester, trimellitic acid ester, etc. are mentioned, for example.

(Photopolymerization initiator)

Although the photoinitiator (polymerization catalyst) contained in the photocurable resin composition used for the hard coat film of this invention is not specifically limited, For example, an acetophenone system photoinitiator, a benzoin system photoinitiator, a benzophenone system photoinitiator, A thioxanthone type photoinitiator, a thioxanthone type photoinitiator, etc. are mentioned.

Examples of acetophenone-based photopolymerization initiators include acetophenone, p- (tert-butyl) 1 ′, 1 ′, 1′-trichloroacetophenone, chloroacetophenone, 2 ′, 2′-diethoxyacetophenone and hydroxyaceto Phenone, 2,2-dimethoxy-2'-phenylacetophenone, 2-aminoacetophenone, dialkylaminoacetophenone, and the like.

As a benzoin type photoinitiator, benzyl, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy 2-methyl -1-phenyl-2-methylpropan-1-one, 1- (4-isopropylphenyl) -2-hydroxy 2-methylpropan-1-one, benzyl dimethyl ketal and the like.

Examples of the benzophenone-based photopolymerization initiators include benzophenone, benzoylbenzoic acid, methyl benzoyl benzoate, methyl-o-benzoylbenzoate, 4-phenylbenzophenone, hydroxybenzophenone, hydroxypropylbenzophenone, and acrylbenzophenone. X-bis (dimethylamino) benzophenone etc. are mentioned.

As a thioxanthone type photoinitiator, thioxanthone, 2-chloro thioxanthone, 2-methyl thioxanthone, diethyl thioxanthone, dimethyl thioxanthone, etc. are mentioned.

As another photoinitiator, (alpha)-acyl oxime ester, benzyl- (o-ethoxycarbonyl)-(alpha)-monooxime, acyl phosphine oxide, glyoxy ester, 3-ketocoumarin, 2-ethyl Anthraquinone, camphor quinone, tetramethylthiuram sulfide, azobisisobutyronitrile, benzoyl peroxide, dialkyl peroxide, tert-butyl peroxy fibrate and the like.

One type of these photoinitiators may be used and may use two or more types together. It is preferable that it is 0.005-10 mass%, and, as for content of a photoinitiator, the mass percentage which makes whole quantity of a polymeric compound 100 mass%, and it is especially preferable that it is 0.01-5 mass%. If content of a photoinitiator is 0.005 mass% or more, a polymeric compound can be polymerized in a short time, and if it is 5 mass% or less, the residue of a photoinitiator is hard to remain in hardened | cured material.

In the hard coat film which has a hard-coat layer in one side of a transparent resin film, and the black layer and / or an icon print layer are formed in the other side, The other surface is a photocurable resin composition containing a photoinitiator. After further apply | coating the said photocurable resin composition also on the upper part of the said printing layer in the whole upper part of the part in which the said printing layer is not formed, the coating film of a photocurable resin composition is photocured and an adhesive layer is formed. do. Furthermore, in the hard-coat film which has a hard-coat layer in both surfaces of a transparent resin film, and the printed layer of a black frame and / or an icon is formed on the said hard-coat layer of one side, photocurable resin containing a photoinitiator. After apply | coating a composition to the whole upper part of the part in which the said hard-coat layer in which the said printing layer is not formed among the said one surface, and the said photocurable resin composition further also in the upper part of the said printing layer, The coating film of a chemical composition is photocured and an adhesive layer is formed. It is easy to apply | coat the photocurable resin composition before photocuring so that it does not contain an air aggregate or a bubble, and it is hard to have an adhesive layer in the upper part of the part in which the printing layer is not formed by hardening by light irradiation after application | coating and increasing a viscosity. Coat films can be prepared. Moreover, when an adhesive layer further covers the upper part of a printing layer, the hard coat film which has an adhesive layer of a different thickness in the part in which the printing layer is not formed and the part in which the printing layer was formed can be manufactured.

(Thickness of each layer)

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the hard coat film of this invention.

The hard coat film 1 of this example has the hard coat layer 6 on one side of the transparent resin film 2, and the printed layer of a black frame and / or an icon on the other side of the transparent resin film 2 ( 3) is formed and has fluidity including a photopolymerization initiator on the upper side of the portion where the printing layer 3 is not formed and on the upper side of the printing layer 3 of the other side of the transparent resin film 2. The adhesive layer 4 which hardens a photocurable resin composition is laminated | stacked, and the peeling film 5 which peeled on the said adhesive layer 4 is bonded together, and is formed rather than the thickness t2 of the printing layer 3 The thickness difference (t1-t2) between the thickness t1 of the adhesive layer 4 and the thickness t2 of the printing layer 3 is characterized by being smaller.

In the hard coat film obtained by making thickness difference (t1-t2) between thickness t1 of the adhesive layer 4 and thickness t2 of the printing layer 3 smaller than thickness t2 of the printing layer 3, Even if an external load is applied, occurrence of depression can be suppressed, and formation of depression is difficult when pressing the surface of the resulting hard coat film with a finger, a touch pen, or the like.

When the thickness difference t1-t2 between the thickness t1 of the pressure-sensitive adhesive layer 4 and the thickness t2 of the printing layer 3 becomes larger than the thickness t2 of the printing layer 3, the surface of the obtained hard coat film is obtained. When pressurized with a finger, a touch pen, or the like, dents tend to occur.

In the hard coat film of this invention, it is preferable that the thickness of the said transparent resin film 2 is 25 micrometers-125 micrometers, and the range of 50 micrometers-125 micrometers is more preferable.

Moreover, the range of 15 micrometers-28 micrometers is preferable, and, as for the thickness t2 of the adhesive layer 3, the range of 20 micrometers-28 micrometers is more preferable.

Example

Hereinafter, the present invention will be described in detail by way of examples.

<Preparation of a hard coat film having a print layer>

As a transparent resin film, the 125-micrometer-thick polyethylene terephthalate (PET) resin film was used, and the hard-coat film (DIC Corporation make, brand name: HC7125F-TP) in which the hard-coat layer was formed in both surfaces was used. Using a silk printing machine on one side of the hard coat film, a black pigment-based ink (Seiko Adobans, HAC series, Conk 710 black) is printed and dried so that the thickness after drying is 15 µm, and the vertical and horizontal dimensions The hard coat film A in which the printing layer of the black frame of about 115 mm x about 60 mm (the dimension of the display area in a black frame is about 90 mm x about 53 mm) was formed.

The obtained hard coat film (A) has the thickness of the printed layer of a black frame of 15 micrometers, and has the height of the level | step difference by the printed layer of a black frame (henceforth a height of a printing level | step difference).

(Example 1)

The urethane acrylate type UV curable resin composition which has a urethane acrylate as a main component in the upper part of the part in which the black frame by the printing layer is not formed using the said hard coat film (A), and the upper part of the black frame by the printing layer. (K-SM Co., Ltd. product, T-470 type) was apply | coated so that thickness might become 25 micrometers after hardening from the transparent resin film surface of the said hard-coat film (A), and the adhesive composition was laminated | stacked. Moreover, UV irradiation was performed in nitrogen purge atmosphere, the urethane acrylate type UV curable resin composition was hardened | cured, the optical transparent adhesive layer was formed, and the hard coat film of Example 1 was obtained.

(Example 2)

The urethane acrylate type UV curable resin composition which has a urethane acrylate as a main component in the upper part of the part in which the black frame by the printing layer is not formed using the said hard coat film (A), and the upper part of the black frame by the printing layer. (K-M Corporation, T-470 type) was apply | coated so that thickness might become 23 micrometers after hardening from the transparent resin film surface of the said hard coat film (A), and the adhesive composition was laminated | stacked. Moreover, UV irradiation was performed in nitrogen purge atmosphere, the urethane acrylate type UV curable resin composition was hardened | cured, the optical transparent adhesive layer was formed, and the hard coat film of Example 2 was obtained.

(Comparative Example 1)

The urethane acrylate used in Example 1 was subjected to a peeling treatment with silicone on one side of a polyethylene terephthalate (PET) resin film having a length of about 115 mm x about 60 mm and a thickness of 50 µm. The urethane acrylate type UV curable resin composition used was apply | coated so that the thickness after hardening might be set to 25 micrometers, and the adhesive composition was laminated | stacked. Furthermore, it hardened | cured by performing UV irradiation in nitrogen purge atmosphere, and the optical transparent adhesive layer was formed. Then, the peeling process by silicone is performed on the hardened optical transparent adhesive layer, a peeling agent layer is formed, and the peeling process surface of the polyethylene terephthalate (PET) resin film whose thickness is 38 micrometers is overlapped and bonded, and it is optical, The transfer film (double-sided adhesive tape) of the transparent adhesive layer for solvents was obtained.

The optical transparent adhesive layer which is 25 micrometers in thickness was formed using the obtained transfer film (double-sided adhesive tape) of the optical transparent adhesive layer, and the printed layer of the said hard-coat film (A) (having a printing step of 15 micrometers) was formed. It bonded together to the surface and laminated | stacked and obtained the hard coat film of the comparative example 1.

In the obtained hard coat film of Comparative Example 1, a large number of bubbles were generated in the portion of the printing step.

(Comparative Example 2)

The urethane acrylate type UV curable resin composition which has a urethane acrylate as a main component in the upper part of the part in which the black frame by the printing layer is not formed using the said hard coat film (A), and the upper part of the black frame by the printing layer. (K-M Corporation, T-470 type) was apply | coated so that thickness might become 30 micrometers after hardening from the transparent resin film surface of the said hard coat film (A), and the adhesive composition was laminated | stacked. Moreover, UV irradiation was performed in nitrogen purge atmosphere, the urethane acrylate type UV curable resin composition was hardened | cured, the optical transparent adhesive layer was formed, and the hard coat film of the comparative example 2 was obtained.

(Bubble confirmation examination after bonding)

The to-be-adhered body which bonded together the ITO film (made by Nakai Industrial Co., Ltd., product name: metaforce 125R2xA, surface resistance value 250 ohms / m <2>) with the adhesive tape was prepared on the glass plate.

The hard coat films of Examples 1 and 2 and Comparative Examples 1 and 2 produced using a bonding device (manufactured by Clime Products Co., Ltd., name: small sheetfed bonding machine, model: SE320) are bonded to the ITO surface of the adherend. It was.

About the hard coat film of Example 1, Example 2, and the comparative example 2, it could bond together in the part with the printing step of the transparent resin film and the black frame of a printing layer so that a bubble may not arise. About the hard coat film of the comparative example 1, air bubbles generate | occur | produced in the part with the printing step of the transparent resin film and the black frame of a printing layer. After that, the generated bubbles were able to be reduced as a whole by the autoclave treatment (40 ° C. × 0.5 mMPa × 15 minutes), but bubbles having a size enough to be visually recognized remained.

The hard coat film of the comparative example 1 is bonded to the surface in which the printed layer of the hard-coat film A was formed using the obtained transfer film (double-sided adhesive tape) of the optical transparent adhesive layer, and transfers an adhesive layer. It is made. For this reason, it is thought that the distance of the thickness / printing step of an adhesive layer = 25 micrometers / 15 micrometers = 1.7, and the thickness of an adhesive layer is large compared with the distance of a printing step, and it is difficult that absorption of an unevenness | corrugation is difficult.

(Feasibility test)

In the sample produced by the bubble confirmation test after bonding, the pencil hardness test according to K5400-1 was performed except having made the load into 1 kg. As a result, in Example 1, 2 and the comparative example 1, it was pencil hardness 2H and it was not able to visually confirm that the indentation generate | occur | produced in the part rubbed with a pencil. However, in the comparative example 2, although it was pencil hardness 2H, it was confirmed that dents generate | occur | produced with the naked eye.

Examples 1 and 2 are urethane acrylates on the upper part of the black frame formed by the printing layer and the upper part of the black frame formed by the printing layer using the hard coat film A on which the printing layer of the black frame was formed. After apply | coating UV curable resin composition which has fluidity | liquidity of a system, it is photocured and the adhesive layer is formed. In Examples 1 and 2, there was little distortion of a printing step, and generation | occurrence | production of the bubble was not seen in the bubble confirmation test after bonding. In addition, in the indentation test, indentation was not visually confirmed. In Examples 1 and 2, the thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer was smaller than the thickness of the printing layer.

On the other hand, in the comparative example 1, after UV-curing resin composition which has the fluidity of a urethane acrylate type | system | group, the transfer film of the optically transparent adhesive layer was produced, it was made to the hard-coat film (A) in which the printing layer of the black frame was formed. Although the adhesive layer was transferred and the hard coat film was obtained, many bubbles generate | occur | produced in the printing step part in the bubble confirmation test after bonding. Moreover, in the comparative example 1, the distortion of the printing level | step difference was recognized.

Moreover, in the comparative example 2, urethane acryl was formed on the upper part of the part in which the black frame by the printing layer is not formed using the hard-coat film A in which the printing layer of the black frame was formed, and the upper part of the black frame by the printing layer. After apply | coating UV curable resin composition which has the fluidity | liquidity of a rate system, it is photocured and formed the thickness of an adhesive layer in 15 micrometers equal to the thickness of a printing layer. In the comparative example 2, there was little distortion of the printing step | step, and there was no foam | bubble even in the bubble confirmation test after bonding, but the dent was confirmed visually in a dent test.

Japanese Patent Application No. 2010-026814, which is a patent application related to the present invention, is based on the inventor of the present invention and the like, but judging from the results of Example 8 shown in the application specification, the pressure-sensitive adhesive layer used in the hard coat film of the present invention When the storage elastic modulus is applied, the thickness of the pressure-sensitive adhesive layer filling the printing step is considered to require a thickness of 10 times or more of the printing step distance (for example, in Example 8 of the application specification, the printing step of 20 μm is 200 Filled with an adhesive layer having a thickness of μm). However, in the hard coat film of this invention, since it uses the 125-micrometer polyethylene terephthalate (PET) resin film which has flexibility in a transparent resin film and can deform flexibly, the thickness of the adhesion layer which fills the step of printing Even if it is less than 10 times the printing step distance, it is thought that bonding was possible even without filling the bubble even if the distance of the printing step was filled.

In the conventional hard coat film which has the adhesive layer which filled the adhesive in the printing frame, when bonding to the to-be-adhered body with a printing step, the adhesive layer and printing which forcibly comprise a hard coat film are used by using the flexible adhesive layer which strengthened adhesive force. Since the base film on which the frame is formed is deformed and bonded, not only the distortion of the base film but also a high density portion of the pressure-sensitive adhesive layer is formed at the periphery of the printing step, but the density of the pressure-sensitive adhesive layer is low at the part away from the periphery of the printing step. There was a problem.

As a result, due to the difference in the density of the pressure-sensitive adhesive layer generated, the transmitted light may be refracted and the image from the image display body may be distorted. For example, when a hard coat film having a pressure-sensitive adhesive layer in which a pressure-sensitive adhesive is filled in a conventional printing frame is bonded to the surface of a display, the reflected light is distorted in the state where an image is not displayed, and the same smoothness as in the case of using glass is achieved. Since it could not be shown, there existed a problem that designability also fell.

In the hard coat film according to the present invention, a black frame and / or an icon is printed on an upper portion of a portion (a portion where an image of a display is displayed) where a step formed of a black frame and / or an icon print layer is not formed. It has a pressure-sensitive adhesive layer having a different thickness on the upper portion of the portion (the portion where an image of the display is not displayed), and the difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printed layer is greater than the thickness (printing step) of the printed layer. Since the difference is small, the surface of the hard coat layer is reduced in physical irregularities and optical distortion.

In addition, the hard coat film according to the present invention can fill the printing step irrespective of the flexibility of the pressure-sensitive adhesive layer, so that not only the flexible pressure-sensitive adhesive layer having enhanced adhesive strength, but also the hard re-peelable pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer can be transferred. It is possible to use a pressure-sensitive adhesive layer having a very hard physical property so as not to have.

Moreover, when bonding the hard coat film of this invention to a to-be-adhered body, since workability can be improved by using said bonding apparatus, for example, without performing manual bonding, it is more preferable.

TECHNICAL FIELD The present invention relates to a hard coat film having a small optical distortion due to a printing step, a small bubble remaining, and hardly occurring when a load is applied, and a touch panel using the same. The hard coat film of this invention can be used suitably as a scattering prevention film used for the protection of a touch panel, and an icon sheet bonded to the ITO surface of a capacitive touch panel.

One… Hard coat film, 2... Transparent resin film, 3... Print layer, 4... Pressure-sensitive adhesive layer, 5... Release film, 6... Hard coat layer, t1... Thickness of an adhesive layer, t2... Thickness of printed layer, t1-t2... Thickness difference between thickness of adhesive layer and thickness of printed layer

Claims (10)

A hard coat layer is formed on one side of the transparent resin film, and a black frame and / or an icon printed layer is formed on the other side, and an upper portion of the other side on which the print layer is not formed, and The adhesive layer which hardens the photocurable resin composition which has the fluidity | liquidity containing a photoinitiator is laminated | stacked on the said printing layer, and the peeling film exfoliated on the said adhesive layer is bonded together, and it is rather than the thickness of the said printing layer A hard coat film having a smaller thickness difference between the thickness of the pressure-sensitive adhesive layer and the thickness of the printing layer. The said hard coat layer which has a hard-coat layer on both surfaces of a transparent resin film, and the printed layer of a black frame and / or an icon is formed on the said hard-coat layer of one side, The said hard-printed layer in which the said printing layer is not formed. The pressure-sensitive adhesive layer formed by curing the photocurable resin composition having a fluidity property containing a photopolymerization initiator on the upper portion of the portion where the coat layer is exposed and the portion where the printing layer is formed is laminated, and peeled off on the pressure-sensitive adhesive layer. The hard-coat film in which the processed peeling film is bonded together and whose thickness difference between the thickness of the said adhesive layer and the thickness of the said printing layer is smaller than the thickness of the said printing layer. 3. The method according to claim 1 or 2,
The hard coat film whose said photocurable resin composition is a urethane acryl-type photocurable adhesive composition which consists of a main body which consists of a urethane acryl-type polymer and / or urethane acrylate, an acryl-type monomer, a crosslinking agent, and a photoinitiator. 3. The method according to claim 1 or 2,
The hard-coat film whose thickness of the said transparent resin film is 25 micrometers-125 micrometers, whose thickness of an adhesive layer is 15 micrometers-28 micrometers, and whose thickness of a printing layer is thinner than the thickness of an adhesive layer. The method of claim 3, wherein
The hard-coat film whose thickness of the said transparent resin film is 25 micrometers-125 micrometers, whose thickness of an adhesive layer is 15 micrometers-28 micrometers, and whose thickness of a printing layer is thinner than the thickness of an adhesive layer. The touch panel in which the hard coat film of Claim 1 or 2 was bonded through the said adhesive layer. The touch panel with which the hard-coat film of Claim 3 was bonded through the said adhesive layer. The touch panel with which the hard-coat film of Claim 4 was bonded through the said adhesive layer. The touch panel with which the hard-coat film of Claim 5 was bonded through the said adhesive layer. An electronic device with a built-in touch panel of claim 6.

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