JP2017033031A - Hard coat film for touch panel and folding-type picture display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film for a touch panel having extremely excellent hardness and durable folding properties.SOLUTION: A hard coat film for a touch panel 10 is used as a surface material of a touch panel, includes a base material film and a hard coat layer, and satisfies conditions 1 and 2. (Condition 1) No crack or rupture occurs after conducting, repeatedly 100 thousand times, a test of folding a surface on a hard coat layer side of the hard coat film for a touch panel by 180° with an interval of 3 mm. (Condition 2) The hard coat layer has a hardness of 7 H or higher in a pencil hardness test (1 kg load) stipulated by JIS K5600-5-4 (1999).SELECTED DRAWING: Figure 1

Description

The present invention relates to a hard coat film for a touch panel and a foldable image display device.

An image display surface of an image display device, particularly an image infant device equipped with a touch panel that has been rapidly spreading in recent years, is required to have excellent hardness so as not to be damaged during handling. In contrast, for example, the hardness of the image display surface of an image display device is generally improved by using a hard coat film in which a hard coat (HC) layer is formed on a base film.

The performance required for such a hard coat film has been increasingly increased in recent years. For example, Patent Document 1 discloses that a modified silica fine particle and an acrylic series are formed on a substrate composed of three or more resin layers. A hard coat film in which a hard coat layer containing a polymer and a matrix resin is formed is disclosed.

By the way, in recent years, the hard coat film may be required to have excellent durability folding performance that does not cause cracking even when the hard coat film is repeatedly folded, together with excellent hardness.
However, since hardness and folding performance are usually in a trade-off relationship, with conventional hard coat films, the durability will decrease when the hardness is increased, and the hardness will decrease when the durability is improved. Therefore, these performances could not be improved at the same time.
In recent years, an image display device equipped with a touch panel has been rapidly spread. However, an image display device equipped with the touch panel often uses glass for a display screen. However, although glass has high hardness, it cannot be given folding performance because it is broken when folded, and glass is a material with a large specific gravity. When the glass is thinned, there is a problem that the strength is reduced and the glass is easily broken.

Further, for example, Patent Document 2 discloses a hard coat film in which two hard coat layers having different Vickers hardness are provided on one surface of a transparent substrate as a hard coat film having hard coat properties and flexibility. It is disclosed.
However, although such a hard coat film has a certain degree of hardness and flexibility, it is still not sufficient.

JP 2014-238614 A JP 2014-186210 A

In view of the above-mentioned present situation, the present invention aims to provide a hard coat film for a touch panel having extremely excellent hardness and durable folding performance, and a foldable image display apparatus using the hard coat film for a touch panel. It is.

The present invention is used as a surface material of a touch panel, and is a hard coat film for a touch panel having a base film and a hard coat layer,
A hard coat film for a touch panel satisfying the following (Condition 1) and (Condition 2).
(Condition 1) No crack or breakage occurs when the test of folding the hard coat layer side surface of the touch panel hard coat film 180 ° at a spacing of 3 mm is repeated 100,000 times (Condition 2) The hard coat layer The hardness of the pencil hardness test (1 kg load) specified in JIS K5600-5-4 (1999) is 7H or more.

In the hard coat film for a touch panel of the present invention, the hard coat layer is provided on the base film side, and a first hard coat layer for satisfying (Condition 2) and the base film of the first hard coat layer It is preferable to have the 2nd hard-coat layer for satisfying (condition 1) provided on the surface opposite side.
In the hard coat film for a touch panel of the present invention, the second hard coat layer contains a cured product of a polyfunctional (meth) acrylate monomer as a resin component, and the first hard coat layer has a polyfunctional (meta) as a resin component. It is preferable to contain a cured product of acrylate and silica fine particles dispersed in the resin component.
The silica fine particles are preferably reactive silica fine particles.
The base film may be a polyethylene terephthalate film, a polyimide film, a triacetyl cellulose film, a polyethylene terephthalate film, a polyamideimide film, a polyetherimide film, a polyetherketone film, a polyamide film, or an aramid film. preferable.
Moreover, it is preferable that the thickness of the said base film is 10-100 micrometers.
Moreover, it is preferable that the hard coat film for touch panels of this invention further has antifouling performance, and it is preferable to further have an electroconductive layer.

A foldable image display device using the hard coat film for a touch panel of the present invention is also one aspect of the present invention.
Hereinafter, the present invention will be described in detail.

The hard coat film for a touch panel of the present invention has a base film and a hard coat layer.
Although it does not specifically limit as said base film, For example, a polyethylene terephthalate film, a polyimide film, a triacetyl cellulose film, a polyethylene terephthalate film, a polyamide imide film, a polyether imide film, a polyether ketone film, a polyamide film, or an aramid A film is preferably used. It is preferable that the base film made of these materials does not cause cracking in the durability folding test described later and has excellent optical properties such as transparency. Especially, since it has the outstanding hardness as said base film, a polyimide film is preferable.
Here, since polyimide films and aramid films have an aromatic ring in the molecule, they are generally colored (yellow). However, when used for optical film applications, the skeleton in the molecule is changed. It is preferable to use a film called “transparent polyimide” or “transparent aramid” with improved transparency. On the other hand, a colored conventional polyimide film or the like is preferably used for an electronic material such as a printer or an electronic circuit in terms of heat resistance and flexibility.

The substrate film preferably has a thickness of 10 to 100 μm. When the thickness of the substrate film is less than 10 μm, the curl of the hard coat film for a touch panel of the present invention becomes large, and the hardness is insufficient, and the pencil hardness described later may not be 7H or more, Furthermore, when the hard coat film for a touch panel of the present invention is produced by Roll to Roll, wrinkles are likely to occur, so that the appearance may be deteriorated. On the other hand, if the thickness of the substrate film exceeds 100 μm, the folding performance of the hard coat film for a touch panel of the present invention may be insufficient, and may fail to satisfy the requirements for the durability folding test described later. The hard coat film for touch panels becomes heavy, which is not preferable in terms of weight reduction.

The hard coat film for a touch panel of the present invention has extremely excellent hardness, scratch resistance and foldability, and is used as a surface material of a touch panel.
Such a hard coat film for a touch panel of the present invention satisfies the following (Condition 1) and (Condition 2).
(Condition 1) No crack or breakage occurs when the test of folding the hard coat layer side surface of the touch panel hard coat film 180 ° at a spacing of 3 mm is repeated 100,000 times (Condition 2) The hard coat layer The hardness of the pencil hardness test (1 kg load) specified in JIS K5600-5-4 (1999) is 7H or more.

The above (Condition 1) is a condition indicating that the hard coat film for a touch panel of the present invention has a durable folding performance.
FIG. 1 is a cross-sectional view schematically showing a test (hereinafter also referred to as a durability folding test) for folding the entire surface of the hard coat film for a touch panel of the present invention by 180 ° at an interval of 3 mm shown in (Condition 1).
As shown in FIG. 1 (a), in the endurance folding test, first, one side of the hard coat film 10 for a touch panel of the present invention and another side facing the one side are parallel to each other. It fixes to the arrange | positioned upper fixing part 11 and the lower fixing part 12, respectively. In addition, although the hard coat film for touchscreens of this invention may be arbitrary shapes, it is preferable that the hardcoat film 10 for touchscreens of this invention in the said durable folding test is a rectangle.
Further, as shown in FIG. 1, the upper fixing portion 11 is fixed, and the lower fixing portion 12 is movable to the left and right while maintaining parallel to the upper fixing portion 11.
In the present invention, the distance between the upper fixing portion 11 and the lower fixing portion 12 is 3 mm.

Next, as shown in FIG. 1 (b), by moving the lower fixing portion 12 to the left, another bending portion of the touch panel hard coat film 10 of the present invention is fixed to the lower fixing portion 12. As shown in FIG. 1 (c), the lower fixing portion 12 is moved to the right to move the bent portion of the hard coat film for touch panel 10 of the present invention to the upper fixing portion 11. Move to near one fixed side. In addition, the hard coat film 10 for touchscreens of this invention is folded by the hard coat layer side.
By moving the lower fixing portion 12 as shown in FIGS. 1A to 1C, the entire surface of the hard coat layer side surface of the hard coat film for a touch panel of the present invention can be folded by 180 °.
The above (Condition 1) indicates that the hard coat film for a touch panel of the present invention is not cracked when the folding test represented in FIGS. . If a crack occurs in the hard coat film for touch panel 10 of the present invention within 100,000 times, the durable folding performance of the hard coat film for touch panel of the present invention becomes insufficient. In this invention, it is preferable that a crack does not arise when the said durable folding test is done 150,000 times.
In the present invention, even when the above-described hard coat film for touch panel 10 of the present invention is rotated by 90 ° and the same durability folding test is performed, cracks do not occur in the same manner.

The above (Condition 2) is a condition indicating that the hard coat film for touch panel of the present invention has excellent strength, and the pencil hardness test (1 kg) defined in JIS K5600-5-4 (1999) of the hard coat layer. The hardness of (load) is 7H or more. If it is less than 7H, the strength of the hard coat film for a touch panel of the present invention will be insufficient. The hard coat layer preferably has a pencil hardness of 8H or higher.

The hard coat film for a touch panel of the present invention satisfying the above (Condition 1) and (Condition 2) is a selection of the material of the base film, the control of the thickness of the base film, the strength of the hard coat layer and the hard coat film. It can be obtained by controlling the laminating method on the base film according to the strength of the coat layer.
In such a hard coat film for a touch panel of the present invention, the hard coat layer includes a first hard coat layer provided on the base film side, and a side opposite to the base film side of the first hard coat layer. It is preferable to have a second hard coat layer provided on the surface.

The first hard coat layer is a layer for satisfying the above (Condition 2), and the Martens hardness at the center of the cross section is preferably 550 MPa or more and 1500 MPa or less. When it is less than 550 MPa, the pencil hardness of the hard coat layer is insufficient and the above (Condition 2) may not be satisfied. When it is 1500 MPa or more, the durable folding performance of the hard coat film for a touch panel of the present invention May be insufficient. The more preferable lower limit of the Martens hardness at the cross-sectional center of the first hard coat layer is 600 MPa, and the more preferable upper limit is 950 MPa.

The second hard coat layer is a layer for satisfying the above (Condition 1), and the Martens hardness at the center of the cross section is preferably 450 MPa or more and 1500 MPa or less. If it is less than 450 MPa, the scratch resistance of the hard coat layer may be insufficient, and if it exceeds 1500 MPa, the folding performance of the hard coat film for touch panel of the present invention is insufficient and the above-mentioned (conditions) 1) may not be satisfied. The more preferable lower limit of the Martens hardness at the center of the cross section of the second hard coat layer is 375 MPa, and the more preferable upper limit is 575 MPa.
In the hard coat film for a touch panel of the present invention, the Martens hardness of the first hard coat layer is preferably larger than the Martens hardness of the second hard coat layer. By having such a relationship of Martens hardness, the hard coat film for a touch panel of the present invention has particularly good pencil hardness. This is because when the pencil hardness test is applied to the hard coat film for touch panel of the present invention and the pencil is loaded with a load, deformation of the hard coat film for touch panel of the present invention is suppressed, and scratches and dent deformation are prevented. This is because it decreases.
As a method for making the Martens hardness of the first hard coat layer larger than the Martens hardness of the second hard coat layer, for example, control is made so that the content of silica fine particles described later is contained more on the first hard coat layer side. And the like.
In the hard coat film for a touch panel of the present invention, the hard coat layer may have a single structure. In this case, silica fine particles described later are unevenly distributed on the base film side in the hard coat layer, that is, It is preferable that the proportion of silica fine particles in the hard coat layer is inclined so as to be larger on the base film side and smaller as it goes to the side opposite to the base film side.
In the present specification, “Martens hardness” is the hardness when the indenter is pushed in by 500 nm by the hardness measurement by the nanoindentation method.
In addition, in this specification, the measurement of the Martens hardness by the said nanoindentation method was performed using "TI950 TriboIndenter" made from HYSITRON (Heiditron). That is, a Berkovich indenter (triangular pyramid) as the above indenter is pushed in by 500 nm from the hard coat layer surface of the hard coat film for a touch panel of the present invention, and is held constant to relieve the residual stress, and then unloaded and after relaxation. The max load is measured, and the Martens hardness is calculated by P _max / A using the max load (P _max (μN) and a recessed area (A (nm ² ) having a depth of 500 nm).

In the hard coat film for a touch panel of the present invention, the first hard coat layer may contain a cured product of polyfunctional (meth) acrylate as a resin component, and may contain silica fine particles dispersed in the resin component. preferable.
Examples of the polyfunctional (meth) acrylate include trimethylolpropane tri (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, pentaerythritol tri ( (Meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate , Ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, tripentaerythritol octa (meth) acrylate , Tetrapentaerythritol deca (meth) acrylate, isocyanuric acid tri (meth) acrylate, isocyanuric acid di (meth) acrylate, polyester tri (meth) acrylate, polyester di (meth) acrylate, bisphenol di (meth) acrylate, di Glycerin tetra (meth) acrylate, adamantyl di (meth) acrylate, isobornyl di (meth) acrylate, dicyclopentane di (meth) acrylate, tricyclodecane di (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, and these Examples thereof include those modified with PO, EO, caprolactone and the like.
Among these, since the above-mentioned Martens hardness can be satisfactorily satisfied, those having 3 to 6 functionalities are preferable, for example, pentaerythritol triacrylate (PETA), dipentaerythritol hexaacrylate (DPHA), pentaerythritol tetraacrylate (PETTA). ), Dipentaerythritol pentaacrylate (DPPA), trimethylolpropane tri (meth) acrylate, tripentaerythritol octa (meth) acrylate, tetrapentaerythritol deca (meth) acrylate, and the like are preferable.
In the present specification, (meth) acrylate means acrylate and methacrylate.

The silica fine particles are preferably reactive silica fine particles. The reactive silica fine particles are silica fine particles that can form a crosslinked structure with the polyfunctional (meth) acrylate, and the first hard coat layer contains the reactive silica fine particles. Can be sufficiently increased, and as a result, the above-mentioned condition 2 can be preferably satisfied.

The reactive silica fine particles preferably have a reactive functional group on the surface, and as the reactive functional group, for example, a polymerizable unsaturated group is preferably used, and more preferably photocurable. An unsaturated group, particularly preferably an ionizing radiation curable unsaturated group. Specific examples of the reactive functional group include an ethylenically unsaturated bond such as a (meth) acryloyl group, a vinyl group, and an allyl group, and an epoxy group.

The reactive silica fine particles are not particularly limited and conventionally known fine particles can be used, and examples thereof include reactive silica fine particles described in JP-A-2008-165040.
Moreover, as a commercial item of the said reactive silica microparticles | fine-particles, the product made from Nissan Chemical Industries; MIBK-SD, MIBK-SDMS, MIBK-SDL, MIBK-SDZL, the product made by JGC Catalysts &Chemicals; V8802, V8803 etc. are mentioned, for example. .

The silica fine particles may be spherical silica fine particles, but are preferably atypical silica fine particles. Spherical silica fine particles and atypical silica fine particles may be mixed.
In the present specification, the atypical silica fine particles mean silica fine particles having a shape having potato-like random irregularities on the surface.
Since the atypical silica fine particles have a larger surface area than the spherical silica fine particles, the inclusion of such atypical silica fine particles increases the contact area with the polyfunctional (meth) acrylate, etc. The layer hardness (pencil hardness) can be made more excellent.
Whether or not the atypical silica fine particles are present can be confirmed by observing a cross section of the first hard coat layer with an electron microscope.

When the silica fine particles are irregular-shaped silica fine particles, the average particle diameter of the irregular-shaped silica fine particles is preferably 5 to 200 nm. When the thickness is less than 5 nm, it is difficult to produce the fine particles themselves, the fine particles may be aggregated, and it may be extremely difficult to make an irregular shape. The dispersibility of atypical silica fine particles may be poor and agglomerate in stages. On the other hand, when the average particle diameter of the irregular-shaped silica fine particles exceeds 200 nm, large irregularities may be formed on the hard coat layer, or a problem such as an increase in haze may occur.
The average particle size of the irregular-shaped silica fine particles is the average of the maximum value (major axis) and the minimum value (minor axis) of the distance between the two points on the outer periphery of the irregular-shaped silica fine particles appearing by cross-sectional microscope observation of the hard coat layer. Value.

The hardness (Martens hardness) of the hard coat layer can be controlled by controlling the size and blending amount of the silica fine particles, and as a result, the first hard coat layer can be formed.
For example, when forming the first hard coat layer, the silica fine particles have a diameter of 5 to 200 nm, and preferably 25 to 60 parts by mass with respect to 100 parts by mass of the resin component.

Moreover, it is preferable that the said 2nd hard-coat layer contains the hardened | cured material of a polyfunctional (meth) acrylate monomer as a resin component.
As said polyfunctional (meth) acrylate, the thing similar to what was mentioned above is mentioned.
In addition to the polyfunctional (meth) acrylate, the second hard coat layer may contain polyfunctional urethane (meth) acrylate and / or polyfunctional epoxy (meth) acrylate as a resin component.
Furthermore, the second hard coat layer may contain the silica fine particles described above. Although it does not specifically limit as content of the said silica fine particle in said 2nd hard-coat layer, For example, it is preferable that it is 0-50 mass% in said 2nd hard-coat layer.

The hard coat layer may contain a material other than the above-described materials as long as it satisfies the above-described Martens hardness in any case of the first hard coat layer and the second hard coat layer. For example, as a resin component material, a polymerizable monomer or a polymerizable oligomer that forms a cured product upon irradiation with ionizing radiation may be included.
Examples of the polymerizable monomer or polymerizable oligomer include a (meth) acrylate monomer having a radically polymerizable unsaturated group in the molecule, or a (meth) acrylate oligomer having a radically polymerizable unsaturated group in the molecule. It is done.
Examples of the (meth) acrylate monomer having a radically polymerizable unsaturated group in the molecule or the (meth) acrylate oligomer having a radically polymerizable unsaturated group in the molecule include urethane (meth) acrylate and polyester (meth) ) Acrylates, epoxy (meth) acrylates, melamine (meth) acrylates, polyfluoroalkyl (meth) acrylates, and silicone (meth) acrylate monomers or oligomers. These polymerizable monomers or polymerizable oligomers may be used alone or in combination of two or more. Of these, urethane (meth) acrylate having a polyfunctionality (6 functionalities or more) and a weight average molecular weight of 1000 to 10,000 is preferable.

In addition, in order to adjust the hardness, viscosity of the composition, improve adhesion, etc., the material constituting the hard coat layer may further contain a monofunctional (meth) acrylate monomer.
Examples of the monofunctional (meth) acrylate monomer include hydroxyethyl acrylate (HEA), glycidyl methacrylate, methoxypolyethylene glycol (meth) acrylate, isostearyl (meth) acrylate, 2-acryloyloxyethyl succinate, acryloylmorpholine, N -Acryloyloxyethyl hexahydrophthalimide, cyclohexyl acrylate, tetrahydrofuryl acrylate, isobornyl acrylate, phenoxyethyl acrylate, adamantyl acrylate and the like.

From the viewpoint of improving the hardness of the hard coat layer, the weight average molecular weight of the polymerizable monomer is preferably less than 1000, and more preferably 200 to 800.
Moreover, the weight average molecular weight of the polymerizable oligomer is preferably 1000 to 20,000, more preferably 1000 to 10,000, and still more preferably 2000 to 7000.
In addition, in this specification, the weight average molecular weight of the said polymerizable monomer and polymerizable oligomer is the weight average molecular weight of polystyrene conversion measured by GPC method.

The hard coat layer may contain an ultraviolet absorber (UVA).
As will be described later, the touch panel hard coat film of the present invention is particularly preferably used for a mobile terminal such as a foldable smartphone or tablet terminal, but such a mobile terminal is often used outdoors, Therefore, there exists a problem that the polarizer arrange | positioned under the hard coat film for touchscreens of this invention exposes to an ultraviolet-ray, and deteriorates easily.
However, since the hard coat layer is disposed on the display screen side of the polarizer, if the hard coat layer contains an ultraviolet absorber, the polarizer is preferably deteriorated by exposure to ultraviolet rays. Can be prevented.
In addition, the said ultraviolet absorber (UVA) may be contained in the base film mentioned above. In this case, the ultraviolet absorber (UVA) may not be contained in the hard coat layer.

As said ultraviolet absorber, a triazine type ultraviolet absorber, a benzophenone type ultraviolet absorber, a benzotriazole type ultraviolet absorber, etc. are mentioned, for example.

Examples of the triazine ultraviolet absorber include 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl) -4,6-bis (4-phenylphenyl) -1,3,5-triazine. 2- [4-[(2-hydroxy-3-dodecyloxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2 , 4-Bis [2-hydroxy-4-butoxyphenyl] -6- (2,4-dibutoxyphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy-3-tridecyl) Oxypropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, and 2- [4-[(2-hydroxy-3- (2) ' -Ethyl) hexyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine and the like.
Examples of commercially available triazine ultraviolet absorbers include TINUVIN460, TINUVIN477 (both manufactured by BASF), LA-46 (manufactured by ADEKA), and the like.

Examples of the benzophenone-based ultraviolet absorber include 2-hydroxybenzophenone, 2,4-dihydroxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone, 2,2 ′, 4,4′-tetrahydroxy. Examples include benzophenone, 2-hydroxy-4-methoxybenzophenone, hydroxymethoxybenzophenone sulfonic acid and its trihydrate, and hydroxymethoxybenzophenone sodium sulfonate.
Moreover, as a commercially available benzophenone type ultraviolet absorber, CHMASSORB81 / FL (made by BASF) etc. are mentioned, for example.

Examples of the benzotriazole ultraviolet absorber include 2-ethylhexyl-3- [3-tert-butyl-4-hydroxy-5- (5-chloro-2H-benzotriazol-2-yl) phenyl] propionate, 2 -(2H-benzotriazol-2-yl) -6- (linear and side chain dodecyl) -4-methylphenol, 2- [5-chloro (2H) -benzotriazol-2-yl] -4-methyl- 6- (tert-butyl) phenol, 2- (2H-benzotriazol-2-yl) -4,6-di-tert-pentylphenol, 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) benzotriazole, 2- (2′-hydroxy-3′-tert) -Butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3' -(3 ″, 4 ″, 5 ′ ′, 6 ′ ′-tetrahydrophthalimidomethyl) -5′-methylphenyl) benzotriazole, 2,2-methylenebis (4- (1,1,3,3-tetra Methylbutyl) -6- (2H-benzotriazol-2-yl) phenol) and 2- (2′-hydroxy-3′-tert-butyl-5′-methylphenyl) -5-chlorobenzotriazole Can be mentioned.
Moreover, as a commercially available benzotriazole type ultraviolet absorber, for example, KEMISORB 71D, KEMISORB 79 (all manufactured by Chemipro Kasei Co., Ltd.), JF-80, JAST-500 (all manufactured by Johoku Chemical Co., Ltd.), ULS-1933D (Manufactured by one company), RUVA-93 (manufactured by Otsuka Chemical Co., Ltd.) and the like.

Among these ultraviolet absorbers, triazine ultraviolet absorbers and benzotriazole ultraviolet absorbers are preferably used.
The ultraviolet absorber preferably has higher solubility with the resin component constituting the hard coat layer, and preferably has less bleed-out after the above-described durability folding test.
The UV absorber is preferably polymerized or oligomerized.
As the ultraviolet absorber, a polymer or oligomer having a benzotriazole, triazine, or benzophenone skeleton is preferable, and specifically, (meth) acrylate having a benzotriazole or benzophenone skeleton and methyl methacrylate (MMA) in an arbitrary ratio. It is preferable that it is what was heat-copolymerized with.
In addition, when applying the hard coat film for touch panels of this invention to OLED (organic light emitting diodes), said UVA can also play the role which protects OLED from an ultraviolet-ray.

Although it does not specifically limit as content of the said ultraviolet absorber, It is preferable that it is 1-6 mass parts with respect to 100 mass parts of resin solid content of the said hard-coat layer. If the amount is less than 1 part by mass, the effect of containing the above-described ultraviolet absorber in the hard coat layer may not be sufficiently obtained. If the amount exceeds 6 parts by mass, the hard coat layer may be markedly colored or deteriorated in strength. May occur. The minimum with more preferable content of the said ultraviolet absorber is 2 mass parts, and a more preferable upper limit is 5 mass parts.

The layer thickness of the hard coat layer is preferably 10.0 to 40.0 μm in the case of the first hard coat layer, and 0.5 to 15 in the case of the second hard coat layer. It is preferably 0 μm. When the thickness is less than the lower limit of each layer, the hardness of the hard coat layer may be significantly reduced. When the upper limit of the thickness of each layer is exceeded, coating of the coating liquid for forming the hard coat layer is difficult. In addition, workability (particularly chipping resistance) due to the excessive thickness may be deteriorated.
The more preferred lower limit of the layer thickness of the first hard coat layer is 15.0 μm, the more preferred upper limit is 35.0 μm, and the more preferred lower limit of the layer thickness of the second hard coat layer is 1.0 μm, more preferred. The upper limit is 10.0 μm.
In addition, the layer thickness of the said hard-coat layer is an average value of the thickness of arbitrary 10 places obtained by measuring with the electron microscope (SEM, TEM, STEM) observation of a cross section.

The hard coat film for a touch panel of the present invention having the hard coat layer preferably has a light transmittance of 8% or less at a wavelength of 380 nm. When the transmittance exceeds 8%, when the hard coat film for a touch panel of the present invention is used for a mobile terminal, the polarizer may be easily exposed to ultraviolet rays and deteriorate. A more preferable upper limit of the transmittance of light having a wavelength of 380 nm of the hard coat layer is 5%.
The hard coat layer preferably has a haze of 2.5% or less. When it exceeds 2.5%, when the hard coat film for a touch panel of the present invention is used for a mobile terminal, whitening of the display screen may be a problem. A more preferable upper limit of the haze is 1.5%, and a more preferable upper limit is 1.0%.
The transmittance and haze of the hard coat layer can be achieved, for example, by adjusting the amount of the ultraviolet absorber described above.
The transmittance and haze can be measured according to JIS K-7361 using a haze meter (manufactured by Murakami Color Research Laboratory, product number: HM-150).
In addition, the haze of the entire hard coat film for a touch panel of the present invention is the sum of the haze of the hard coat layer and the haze of the base film, and when the haze of the base film is higher than 1%, the touch panel of the present invention. The overall haze of the hard coat film for use is higher than 1%.

If necessary, the hard coat layer may be, for example, a lubricant, a plasticizer, a filler, an antistatic agent, an antiblocking agent, a crosslinking agent, a light stabilizer, an antioxidant, a colorant such as a dye, or a pigment. These components may be contained.

Moreover, the hard coat film for touch panels of this invention is another hard coat on the surface of the said base film opposite side provided with the hard-coat layer (1st hard-coat layer and 2nd hard-coat layer) mentioned above. A layer (hereinafter also referred to as a back hard coat layer) may be formed. As said back surface hard-coat layer, the layer similar to the hard-coat layer mentioned above is mentioned, for example.
The back hard coat layer preferably has a back hard coat layer (1) and / or a back hard coat layer (2).
Examples of the back hard coat layer (1) and the back hard coat layer (2) include layers having the same composition and thickness as the first hard coat layer or the second hard coat layer described above.
That is, when the hard-coat film for touchscreens of this invention has the said back surface hard-coat layer, as this back-surface hard coat layer, the structure which has the back surface hard-coat layer (1) similar to the 1st hard-coat layer mentioned above, the above-mentioned A structure having a back hard coat layer (1) similar to the second hard coat layer, a back hard coat layer (1) similar to the first hard coat layer described above, and a back hard similar to the second hard coat layer described above. The structure in which the coat layer (2) is laminated in this order from the base film side, the back hard coat layer (1) similar to the second hard coat layer described above, and the back hard similar to the first hard coat layer described above. A structure in which the coat layer (2) is laminated in this order from the base film side is exemplified.
In addition, since the said back surface hard-coat layer is arrange | positioned in the surface on the opposite side to the outermost surface side, when attaching the hard-coat film for touchscreens of this invention to a touchscreen, the antifouling property mentioned later is unnecessary.

Moreover, it is preferable that the hard-coat film for touchscreens of this invention has antifouling property. Such antifouling property can be obtained, for example, by adding an antifouling agent to the hard coat layer.
The hard coat layer containing the antifouling agent preferably has a surface contact angle with water of 100 ° or more. In the hard coat film for a touch panel of the present invention immediately after production, water on the surface of the hard coat layer is used. More preferably, the contact angle with respect to water is 105 ° or more, and the contact angle with respect to water on the surface of the hard coat layer after the steel wool resistance test in the above condition 3 is preferably 90 ° or more, and 103 ° or more. It is more preferable that

It is preferable that the antifouling agent is contained unevenly on the outermost surface side of the hard coat layer. When the antifouling agent is uniformly contained in the hard coat layer, it is necessary to increase the amount of addition in order to impart sufficient antifouling performance, which may lead to a decrease in the film strength of the hard coat layer. When the hard coat layer has the first hard coat layer and the second hard coat layer described above, the antifouling agent is unevenly distributed on the outermost surface side of the second hard coat layer disposed on the outermost surface side. It is preferably included.
As a method of unevenly distributing the antifouling agent on the outermost surface side of the hard coat layer, for example, at the time of forming the hard coat layer, a coating film formed using a composition for a hard coat layer described later is dried and cured. Before the coating, heat is applied to the coating film to lower the viscosity of the resin component contained in the coating film to increase fluidity, and the antifouling agent is unevenly distributed on the outermost surface side. Select and use a stain, float the antifouling agent on the surface of the coating without applying heat when drying the coating, and then cure the coating to bring the antifouling agent to the outermost surface. The method of making it unevenly distributed is mentioned.

The antifouling agent is not particularly limited, and examples thereof include silicone-containing antifouling agents, fluorine-containing antifouling agents, silicone-containing and fluorine-containing antifouling agents, and each may be used alone. You may mix and use. The antifouling agent may be an acrylic antifouling agent.
Specific examples of the antifouling agent include, for example, a fluorine-containing antifouling agent (trade name: OPTOOL DAC, manufactured by Daikin Industries, Ltd.).
The content of the antifouling agent is preferably 0.01 to 3.0 parts by weight with respect to 100 parts by weight of the resin material described above. If the amount is less than 0.01 part by weight, sufficient antifouling property may not be imparted to the hard coat layer, and if it exceeds 3.0 parts by weight, the hardness of the hard coat layer may be reduced.
The antifouling agent preferably has a weight average molecular weight of 5000 or less, and is a compound having preferably 1 or more, more preferably 2 or more reactive functional groups in order to improve the durability of the antifouling performance. is there.
In addition, the said weight average molecular weight can be calculated | required by polystyrene conversion by gel permeation chromatography (GPC).

Furthermore, the antifouling agent having the reactive functional group has good antifouling performance durability (durability), and in particular, the hard coat layer containing the above-mentioned fluorine-containing antifouling agent has a fingerprint. Difficult (not conspicuous) and good wiping property. Furthermore, since the surface tension at the time of application | coating of the said composition for hard-coat layer formation can be lowered | hung, leveling property is good and the external appearance of the hard-coat layer to form becomes a favorable thing.
In addition, the hard coat layer containing the silicone-containing antifouling agent has good sliding properties and good steel wool resistance.
A touch panel equipped with the hard coat film for a touch panel of the present invention containing such a silicone-containing antifouling agent in the hard coat layer has a good feel when touched with a finger, a pen, or the like, and thus has a good tactile sensation. In addition, fingerprints are hardly attached to the hard coat layer (not easily noticeable), and the wiping property is good. Furthermore, since the surface tension at the time of coating of the composition (hard coat layer composition) at the time of forming the hard coat layer can be lowered, the leveling property is good and the appearance of the hard coat layer to be formed is good. It will be a thing.
Moreover, as said antifouling agent which has the said reactive functional group, it can obtain as a commercial item, As a commercial item other than the above, as a silicone-containing antifouling agent, for example, SUA1900L10 (Shin Nakamura Chemical Co., Ltd.) ), SUA1900L6 (manufactured by Shin-Nakamura Chemical Co., Ltd.), Ebecryl 1360 (manufactured by Daicel Cytec Co., Ltd.), UT3971 (manufactured by Nihon Gosei Co., Ltd.), BYKUV3500 (manufactured by BYK Chemie), BYKUV3510 (manufactured by BYK Chemie), BYKUV3570 (manufactured by BYK Chemie), X22 -164E, X22-174BX, X22-2426, KBM503. KBM5103 (manufactured by Shin-Etsu Chemical Co., Ltd.), TEGO-RAD2250, TEGO-RAD2300. TEGO-RAD2200N, TEGO-RAD2010, TEGO-RAD2500, TEGO-RAD2600, TEGO-RAD2700 (manufactured by Evonik Japan), Megafax RS854 (manufactured by DIC) and the like can be mentioned.
As the fluorine-containing antifouling agent, for example, OPTOOL DAC, OPTOOL DSX (manufactured by Daikin Industries, Ltd.), Megafuck RS71, Megafuck RS74 (manufactured by DIC), LINC152EPA, LINC151EPA, LINC182UA (manufactured by Kyoeisha Chemical Co., Ltd.), 650A, tangent 601AD, tangent 602, and the like.
Examples of the antifouling agent having a fluorine-containing and silicone-containing reactive functional group include, for example, MegaFac RS851, MegaFac RS852, MegaFac RS853, MegaFac RS854 (manufactured by DIC), Opstar TU2225, Opstar TU2224. (Manufactured by JSR), X71-1203M (manufactured by Shin-Etsu Chemical Co., Ltd.) and the like.

The hard coat layer can be formed using, for example, a hard coat layer composition to which the resin component and reactive silica fine particles, an ultraviolet absorber, and other components are added.
The said composition for hard-coat layers may contain a solvent as needed.

Examples of the solvent include alcohols (eg, methanol, ethanol, propanol, isopropanol, n-butanol, s-butanol, t-butanol, benzyl alcohol, PGME, ethylene glycol, diacetone alcohol), ketones (eg, acetone, methyl ethyl ketone, Methyl isobutyl ketone, cyclopentanone, cyclohexanone, heptanone, diisobutyl ketone, diethyl ketone, diacetone alcohol), ester (0 methyl acetate, ethyl acetate, butyl acetate, n-propyl acetate, isopropyl acetate, methyl formate, PGMEA) aliphatic Hydrocarbons (eg, hexane, cyclohexane), halogenated hydrocarbons (eg, methylene chloride, chloroform, carbon tetrachloride), aromatic hydrocarbons (eg, benzene, toluene, xylene), Amide (eg, dimethylformamide, dimethylacetamide, n-methylpyrrolidone), ether (eg, diethyl ether, dioxane, tetrahydrofuran), ether alcohol (eg, 1-methoxy-2-propanol), carbonate (dimethyl carbonate, diethyl carbonate, Ethyl methyl carbonate), and the like. These solvents may be used alone or two or more of them may be used in combination.
Among them, as the solvent, the resin component such as the polymerizable monomer and / or polymerizable oligomer described above, and other additives can be dissolved or dispersed to suitably apply the hard coat layer composition. And methyl isobutyl ketone and methyl ethyl ketone are preferred.

The hard coat layer composition preferably has a total solid content of 25 to 55%. If it is lower than 25%, residual solvent may remain or whitening may occur. When it exceeds 55%, the viscosity of the composition for hard coat layers is increased, the coatability is lowered, and unevenness and streaks may appear on the surface. The solid content is more preferably 35 to 50%.

As a method for producing the hard coat film for a touch panel of the present invention using the hard coat layer composition, for example, the hard coat layer composition is applied on one surface of the base film to form a coating layer. The method of forming and drying and hardening this coating layer is mentioned.

Examples of methods for forming the coating layer by applying the hard coat layer composition on one surface of the base film include spin coating, dipping, spraying, die coating, bar coating, and roll coater. Examples include various known methods such as a method, a meniscus coater method, a flexographic printing method, a screen printing method, and a bead coater method.

Although it does not specifically limit as a drying method of the said coating film, Generally it is good to dry for 10 to 120 second at 30-120 degreeC.
Moreover, what is necessary is just to select a well-known method suitably according to the composition etc. of the said composition for hard-coat layers as a hardening method of the said coating film. For example, if the hard coat layer composition is of an ultraviolet curable type, the coating layer may be cured by irradiating with ultraviolet rays.

In the case where the hard coat layer has the first hard coat layer and the second hard coat layer described above, the composition for the first hard coat layer prepared for forming the first hard coat layer is the above group. The coating film formed on the material film is dried and then half cured. By forming a second hard coat layer to be described later in a state where the coating film is not completely cured but half cured, the adhesion between the first hard coat layer and the second hard coat layer becomes extremely excellent. . Examples of the method of half-curing the coating film include a method of irradiating the dried coating film with ultraviolet rays at 100 mJ / cm ² or less.
The second hard coat layer composition prepared for forming the second hard coat layer was applied onto the half-cured first hard coat layer and the formed coating film was dried. By completely curing, the second hard coat layer can be formed on the first hard coat layer. In addition, the steel wool resistance of the surface of the said hard-coat layer (2nd hard-coat layer) will be excellent by fully hardening the coating film using the said composition for 2nd hard-coat layers. As a method for completely curing the coating film of the second hard coat layer composition, for example, the coating film is in a nitrogen atmosphere (oxygen concentration is preferably 500 ppm or less, more preferably 200 ppm or less, and further preferably 100 ppm or less). And the method of hardening by ultraviolet irradiation is mentioned. The steel wool resistance can also be improved by increasing the degree of cross-linking (reaction rate) of the surface opposite to the first hard coat layer side of the second hard coat layer as the outermost surface.
In addition, when forming a 1st hard-coat layer and a 2nd hard-coat layer by the method mentioned above, in order to obtain the hard-coat layer fully hardened | cured (a 1st hard-coat layer and a 2nd hard-coat layer), ultraviolet irradiation The total amount is preferably 150 mJ / cm ² or more.

In the present invention, the hard coat layer may be formed using a conventionally known thermosetting sol-gel method.
The thermosetting sol-gel method is, for example, a method in which an alkoxysilane compound having an epoxy group is hydrolyzed to form a gel that loses fluidity by a polycondensation reaction, and the gel is heated to obtain an oxide. In other cases, for example, an alkoxysilane compound is hydrolyzed and subjected to a polycondensation reaction to obtain an oxide, or an alkoxysilane compound having an isocyanate group is heated to polycondensate to oxidize. Further, there may be used a method of obtaining a product, a method of mixing an alkoxysilane compound and a compound having an isocyanate group at an arbitrary ratio, hydrolyzing, and polycondensation reaction.
The alkoxysilane compound having an epoxy group is not particularly limited as long as it has at least one epoxy group and hydrolyzable silicon group in the molecule. For example, γ-glycidoxypropyltrimethoxysilane, γ -Glycidoxypropyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltriethoxysilane and the like.

The hydrolyzate of the alkoxysilane compound having the epoxy group can be obtained by performing hydrolysis by dissolving the alkoxysilane compound having the epoxy group in an appropriate solvent. Examples of the solvent used include alcohols such as methyl ethyl ketone, isopropyl alcohol, methanol, ethanol, methyl isobutyl ketone, ethyl acetate and butyl acetate, ketones, esters, halogenated hydrocarbons, aromatic hydrocarbons such as toluene and xylene, Alternatively, a mixture thereof can be mentioned. Of these, methyl ethyl ketone is preferred because it has a drying rate suitable for forming a film.

When performing the said hydrolysis, you may use a catalyst as needed. It does not specifically limit as a catalyst to be used, A well-known acid catalyst or a base catalyst can be used.
Examples of the acid catalyst include organic acids such as acetic acid, chloroacetic acid, citric acid, benzoic acid, dimethylmalonic acid, formic acid, propionic acid, glutaric acid, glycolic acid, malonic acid, maleic acid, toluenesulfonic acid, and oxalic acid. And inorganic acids such as hydrochloric acid, nitric acid, and halogenated silane; acidic sol-like fillers such as acidic colloidal silica and oxidized thania sol; These may be used alone or in combination of two or more.
Examples of the base catalyst include aqueous solutions of alkali metal or alkaline earth metal hydroxides such as sodium hydroxide and calcium hydroxide, aqueous ammonia, and aqueous solutions of amines. Of these, the use of hydrochloric acid or acetic acid, which has high catalytic reaction efficiency, is preferred.

The hydrolyzate of the alkoxysilane compound having the epoxy group can be obtained by performing hydrolysis by dissolving the alkoxysilane compound having the epoxy group in an appropriate solvent. Examples of the solvent used include alcohols such as methyl ethyl ketone, isopropyl alcohol, methanol, ethanol, methyl isobutyl ketone, ethyl acetate and butyl acetate, ketones, esters, halogenated hydrocarbons, aromatic hydrocarbons such as toluene and xylene, Alternatively, a mixture thereof can be mentioned. Of these, methyl ethyl ketone is preferred because it has a drying rate suitable for forming a film.

When performing the said hydrolysis, you may use a catalyst as needed. It does not specifically limit as a catalyst to be used, A well-known acid catalyst or a base catalyst can be used.
Examples of the acid catalyst include organic acids such as acetic acid, chloroacetic acid, citric acid, benzoic acid, dimethylmalonic acid, formic acid, propionic acid, glutaric acid, glycolic acid, malonic acid, maleic acid, toluenesulfonic acid, and oxalic acid. And inorganic acids such as hydrochloric acid, nitric acid, and halogenated silane; acidic sol-like fillers such as acidic colloidal silica and oxidized thania sol; These may be used alone or in combination of two or more.
Examples of the base catalyst include aqueous solutions of alkali metal or alkaline earth metal hydroxides such as sodium hydroxide and calcium hydroxide, aqueous ammonia, and aqueous solutions of amines. Of these, the use of hydrochloric acid or acetic acid, which has high catalytic reaction efficiency, is preferred.

Moreover, it does not specifically limit as an alkoxysilane compound which has the said isocyanate group, For example, 3-isocyanatopropyltriethoxysilane, 3-isocyanatepropyltrimethoxysilane, 2-isocyanatoethyltri n-propoxysilane etc. are mentioned.

The compound having an isocyanate group is not particularly limited, and examples thereof include tolylene diisocyanate (TDI), 3,3′-tolylene-4,4′-isocyanate, diphenylmethane 4,4′-diisocyanate (MDI), and triphenyl. Methane p, p ′, p ′ ′-triisocyanate (TM), 2,4-tolylene dimer (TT), naphthalene-1,5-diisocyanate, tris (4-phenylisocyanate) thiophosphate, crude (MDI) ), TDI trimer, dicyclohexamethane 4,4′-diisocyanate (HMDI), hydrogenated TDI (HTDI), metaxylylene diisocyanate (XDI), hexahydrometaxylylene diisocyanate (HXDI), hexamethylene diisocyanate, Trimethylpropane 1-methyl-2-isocyano-4-carbamate, polymethylene polyphenyl isocyanate, 3,3′-dimethoxy 4,4′-diphenyl diisocyanate, diphenyl ether 2,4,1′-triisocyanate, m-xylylene diisocyanate (MXDI) ), Polymethylene polyphenyl isocyanate (PAPI) and the like.

The hard coat film for a touch panel of the present invention preferably further has a conductive layer.
The conductive fibrous filler of the present invention preferably has a fiber diameter of 200 nm or less and a fiber length of 1 μm or more.
When the fiber diameter exceeds 200 nm, the haze value of the conductive layer to be produced may increase or the light transmission performance may be insufficient. The preferable lower limit of the fiber diameter of the conductive fibrous filler is 10 nm from the viewpoint of the conductivity of the conductive layer, and the more preferable range of the fiber diameter is 15 to 180 nm.
Moreover, when the fiber length of the conductive fibrous filler is less than 1 μm, a conductive layer having sufficient conductive performance may not be formed, and aggregation may occur, resulting in an increase in haze value or a decrease in light transmission performance. Therefore, the upper limit of the fiber length is preferably 500 μm, the more preferable range of the fiber length is 3 to 300 μm, and the further preferable range is 10 to 30 μm.
The fiber diameter and fiber length of the conductive fibrous filler are, for example, the fiber diameter and fiber length of the conductive fibrous filler at 1000 to 500,000 times using an electron microscope such as SEM, STEM, or TEM. It can obtain | require as an average value of 10 places measured.

The conductive fibrous filler is preferably at least one selected from the group consisting of conductive carbon fibers, metal fibers, and metal-coated synthetic fibers, for example.
Examples of the conductive carbon fiber include vapor grown carbon fiber (VGCF), carbon nanotube, wire cup, and wire wall. These conductive carbon fibers can use 1 type (s) or 2 or more types.

As said metal fiber, the fiber produced by the wire-drawing method or the cutting method which extends stainless steel, iron, gold | metal | money, silver, aluminum, nickel, titanium etc. thinly and long can be used, for example. Such metal fiber can use 1 type (s) or 2 or more types.

Examples of the metal-coated synthetic fibers include fibers obtained by coating acrylic fibers with gold, silver, aluminum, nickel, titanium, and the like. One or more kinds of such metal-coated synthetic fibers can be used.

As content of the conductive fibrous filler in the said conductive layer, it is preferable that it is 20-3000 mass parts with respect to 100 mass parts of resin components which comprise a conductive layer, for example. When the amount is less than 20 parts by mass, a conductive layer having sufficient conductivity may not be formed. When the amount exceeds 3000 parts by mass, the haze of the conductive laminate of the present invention increases or the light transmission performance is insufficient. It may become. Further, the amount of the binder resin entering the contact of the conductive fibrous filler is increased, so that the conductivity of the conductive layer is deteriorated, and the target resistance value may not be obtained in the conductive laminate of the present invention. The minimum with more preferable content of the said conductive fibrous filler is 50 mass parts, and a more preferable upper limit is 1000 mass parts.
In addition, it does not specifically limit as a resin component of the said electroconductive layer, A conventionally well-known material is mentioned.

Examples of other conductive agents other than the conductive fibrous filler include various cationic compounds having a cationic group such as a quaternary ammonium salt, a pyridinium salt, and first to third amino groups, and sulfonic acid. Anionic compounds having anionic groups such as bases, sulfate ester bases, phosphate ester bases, phosphonate bases, amphoteric compounds such as amino acids and aminosulfuric acid esters, nonions such as amino alcohols, glycerols and polyethylene glycols Compounds, organometallic compounds such as tin and titanium alkoxides, and metal chelate compounds such as acetylacetonate salts thereof, compounds obtained by increasing the molecular weight of the compounds listed above, and tertiary amino groups , A quaternary ammonium group or a metal chelate moiety, and ionization Polymerizable monomer or oligomer by line, or have a polymerizable polymerizable functional groups by ionizing radiation, and the polymerizable compound of the organic metal compounds, such as coupling agents.
As content of the said other electrically conductive agent, it is preferable that it is 1-50 mass parts with respect to 100 mass parts of resin components which comprise the said electroconductive layer. When the amount is less than 1 part by mass, a conductive layer having sufficient conductivity may not be formed. When the amount exceeds 50 parts by mass, the haze of the conductive laminate of the present invention increases or the light transmission performance is insufficient. It may become.

Furthermore, as the conductive agent, for example, conductive fine particles can also be used.
Specific examples of the conductive fine particles include those made of a metal oxide. As such a metal oxide, for example, ZnO (refractive index 1.90, the numerical value in parentheses below represents the refractive index), CeO ₂ (1.95), Sb ₂ O ₅ (1.71). , SnO ₂ (1.997), indium tin oxide (1.95) often referred to as ITO, In ₂ O ₃ (2.00), Al ₂ O ₃ (1.63), antimony-doped tin oxide (Abbreviation: ATO, 2.0), aluminum-doped zinc oxide (abbreviation: AZO, 2.0), and the like can be given. The average particle size of the conductive fine particles is preferably 0.1 nm to 0.1 μm. By being within such a range, when the conductive fine particles are dispersed in the raw material of the resin component constituting the conductive layer, a composition capable of forming a highly transparent film having almost no haze and good total light transmittance. A thing is obtained.
As content of the said electroconductive fine particles, it is preferable that it is 10-400 mass parts with respect to 100 mass parts of resin components which comprise the said electroconductive layer. If the amount is less than 10 parts by mass, a conductive layer having sufficient conductivity may not be formed. If the amount exceeds 400 parts by mass, the haze of the conductive laminate of the present invention is increased or the light transmission performance is insufficient. It may become.

Examples of the conductive agent include aromatic conjugated poly (paraphenylene), heterocyclic conjugated polypyrrole, polythiophene, aliphatic conjugated polyacetylene, heteroatom-containing polyaniline, and mixed conjugated poly. (Phenylene vinylene), a double-chain conjugated system which is a conjugated system having a plurality of conjugated chains in the molecule, a conductive complex which is a polymer obtained by grafting or block co-polymerizing the above-mentioned conjugated polymer chain onto a saturated polymer, etc. It is also possible to use a high molecular weight conductive agent.

The conductive layer may contain refractive index adjusting particles.
Examples of the refractive index adjusting particles include high refractive index fine particles and low refractive index fine particles.
The high refractive index fine particles are not particularly limited. For example, aromatic ring, sulfur atom, or bromine atom is contained in resin materials such as aromatic polyimide resin, epoxy resin, (meth) acrylic resin, polyester resin, and urethane resin. Examples thereof include fine particles made of a material having a high refractive index, such as a resin having a high refractive index and a precursor thereof, or metal oxide fine particles and metal alkoxide fine particles.
The low refractive index fine particles are not particularly limited. For example, a resin having a low refractive index containing a fluorine atom in a resin material such as an epoxy resin, a (meth) acrylic resin, a polyester resin, and a urethane resin, and a precursor thereof. Examples include fine particles made of a material having a low refractive index, magnesium fluoride fine particles, hollow or porous fine particles (organic or inorganic), and the like.

The hard coat film for a touch panel of the present invention has the above-described configuration and satisfies the above (Condition 1), that is, it does not break in the durability folding test, and thus has an extremely excellent folding property. 2), that is, the hardness of the pencil hardness test (1 kg load) is 7H or more.
Such a hard coat film for a touch panel of the present invention can be used not only as a surface protective film for an image display device such as a liquid crystal display device, as well as a curved display or a hard coat film having a conventionally known hard coat layer. It can be used as a surface protective film for products having curved surfaces and a surface protective film for folding members.
Especially, since the hard coat film for touchscreens of this invention has the extremely outstanding foldability, it is used suitably as a surface protection film of a foldable member.
Moreover, since the hard coat film for touch panels of this invention is a member used for a touch panel, it is preferable that it is what has antimicrobial property. The method for imparting antibacterial properties is not particularly limited, and conventionally known methods can be mentioned.
Moreover, since it is a member used for a touch panel, it is preferable that the hard coat film for touch panels of this invention has the blue light cut property by a conventionally well-known method. The blue light means light having a wavelength of 385 to 495 nm.

The foldable member is not particularly limited as long as it is a member having a foldable structure, and examples thereof include a foldable image display device such as a foldable smartphone or a foldable touch panel, and a foldable (electronic) album. It is done. A foldable image display device using the hard coat film for a touch panel of the present invention is also one aspect of the present invention.
The member provided with the structure to be folded may be folded at one place or plural places. The direction of folding can also be arbitrarily determined as necessary.

Since the hard coat film for a touch panel of the present invention has the above-described configuration, it has extremely excellent hardness and durable folding performance.
For this reason, the hard coat film of the present invention is not only a surface protective film similar to a hard coat film having a conventional hard coat layer, but also a folding surface such as a surface protective film of a product having a curved surface or a foldable image display device. It can be suitably used as a surface material for members.

It is sectional drawing which shows a durable folding test typically.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples and comparative examples.
In the text, “part” or “%” is based on mass unless otherwise specified.

Example 1
As a base film, a polyimide film having a thickness of 30 μm (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Co., Ltd.) is prepared, and a hard coat layer composition having the following composition is formed on one surface of the base film. 1 was applied to form a coating film.
Next, the solvent in the coating film is evaporated by heating the formed coating film at 70 ° C. for 1 minute, and ultraviolet rays are radiated in the air using an ultraviolet irradiation device (manufactured by Fusion UV System Japan Co., Ltd., light source H bulb). The film was half-cured by irradiation so that the accumulated light amount was 100 mJ / cm ² to form a first hard coat layer having a thickness of 15 μm.
Subsequently, the hard coat layer composition A having the following composition was applied onto the first hard coat layer to form a coating film. Next, the solvent in the coating film is evaporated by heating the formed coating film at 70 ° C. for 1 minute, and ultraviolet rays are converted into oxygen concentration by using an ultraviolet irradiation device (light source H bulb manufactured by Fusion UV System Japan). Is applied to form a second hard coat layer having a thickness of 5 μm by completely irradiating the coated film with an integrated light amount of 200 mJ / cm ² under a condition of 200 ppm or less. Manufactured.

(Composition 1 for hard coat layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 25 parts by mass Dipentaerythritol EO-modified hexaacrylate (A-DPH-6E, manufactured by Shin-Nakamura Chemical Co., Ltd.) 25 parts by mass atypical silica fine particles (Average particle size 25 nm, manufactured by JGC Catalysts & Chemicals) 50 parts by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Fluorine leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained first hard coat layer was 830 MPa.

(Composition A for hard coat layer)
Urethane acrylate (UX5000, manufactured by Nippon Kayaku Co., Ltd.) 25 parts by mass A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 50 parts by mass polyfunctional acrylate polymer (Acryt 8KX-012C, Taisei Fine Chemical) 25 parts by mass (solid conversion)
Antifouling agent (BYKUV3500, manufactured by Big Chemie) 1.5 parts by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 500 MPa.

(Example 2)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the second hard coat layer was 12 μm.

(Example 3)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the first hard coat layer was 20 μm.

Example 4
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the first hard coat layer was 35 μm.

(Example 5)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the second hard coat layer was 2 μm.

(Example 6)
Instead of a 30 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Company), a 30 μm-thick polyimide film (Polyimide 2, KS-TD, manufactured by Toyobo Co., Ltd.) is used as the base film. A hard coat film for a touch panel was produced in the same manner as in Example 1 except that.

(Example 7)
Implemented except that the hard coat layer composition 2 having the following composition was used instead of the hard coat layer composition 1 and the hard coat layer composition B having the following composition was used instead of the hard coat layer composition A. A first hard coat layer and a second hard coat layer were formed in the same manner as in Example 1 to produce a hard coat film for a touch panel.

(Composition 2 for hard coat layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 25 parts by mass Hexafunctional acrylate (MF001, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 25 parts by mass atypical silica fine particles (average particle size 25 nm, JGC 50 parts by mass (solid conversion)
Fluorine leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained first hard coat layer was 890 MPa.

(Composition B for hard coat layer)
Urethane acrylate (UX5000, manufactured by Nippon Kayaku Co., Ltd.) 50 parts by mass of a mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 50 parts by mass of an antifouling agent (BYKUV3500, manufactured by BYK Chemie) 5 parts by weight (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 600 MPa.

(Example 8)
Implemented except that the hard coat layer composition 3 having the following composition was used instead of the hard coat layer composition 1 and the hard coat layer composition C having the following composition was used instead of the hard coat layer composition A. A first hard coat layer and a second hard coat layer were formed in the same manner as in Example 1 to produce a hard coat film for a touch panel.

(Composition 3 for hard coat layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 35 parts by mass Dipentaerythritol EO-modified hexaacrylate (A-DPH-6E, manufactured by Shin-Nakamura Chemical Co., Ltd.) 35 parts by mass atypical silica fine particles (Average particle diameter 25 nm, manufactured by JGC Catalysts & Chemicals) 30 parts by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Fluorine leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained first hard coat layer was 620 MPa.

(Composition C for hard coat layer)
Urethane acrylate (KRM8452, manufactured by Daicel Ornex) 100 parts by mass antifouling agent (TEGO-RAD2600, manufactured by Evonik Japan)
1.5 parts by weight (solid conversion)
Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 420 MPa.

Example 9
Implemented except that the hard coat layer composition 4 having the following composition was used instead of the hard coat layer composition 1 and the hard coat layer composition D having the following composition was used instead of the hard coat layer composition A. A first hard coat layer and a second hard coat layer were formed in the same manner as in Example 1 to produce a hard coat film for a touch panel.

(Composition 4 for hard coat layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 25 parts by mass hexafunctional acrylate (MF001, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) 10 parts by mass polyfunctional acrylate polymer (PVEEA, AX-4) -HC, manufactured by Nippon Shokubai Co., Ltd.)
15 parts by weight (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass atypical silica fine particles (average particle size 25 nm, manufactured by JGC Catalysts & Chemicals) 50 parts by mass (solid conversion)
Fluorine leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained first hard coat layer was 800 MPa.

(Composition D for hard coat layer)
Urethane acrylate (UV7600B, manufactured by Nippon Synthetic Chemical Co., Ltd.) 50 parts by mass Pentaerythritol triacrylate (M306, manufactured by Toagosei Co., Ltd.) 50 parts by mass of antifouling agent (X71-1203M) (manufactured by Shin-Etsu Chemical Co., Ltd.) 0.5 parts by mass (solid) Conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 600 MPa.

(Example 10)
As a base film, instead of a polyimide film having a thickness of 30 μm (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Company), a polyethylene terephthalate film having a thickness of 50 μm (PET film, manufactured by Toray Industries, Inc.) was used. A hard coat film for a touch panel was produced in the same manner as in Example 1.

(Example 11)
Instead of using a 30 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Company) as the base film, a 50 μm-thick polyethylene naphthalate film (PEN film, manufactured by Teijin Ltd.) was used. Produced a hard coat film for a touch panel in the same manner as in Example 1.

(Example 12)
Instead of using a 30 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Co., Inc.) as the base film, a 40 μm thick triacetyl cellulose film (TAC, manufactured by Fuji Film Co., Ltd.) was used. Produced a hard coat film for a touch panel in the same manner as in Example 1.

(Example 13)
A first hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition 5 having the following composition was used instead of the hard coat layer composition 1 to produce a hard coat film for a touch panel. .

(Composition 5 for hard coat layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 25 parts by mass Dipentaerythritol EO-modified hexaacrylate (A-DPH-6E, manufactured by Shin-Nakamura Chemical Co., Ltd.) 25 parts by mass solid silica Fine particles (average particle size 12 nm, MIBKSD, manufactured by Nissan Chemical Industries)
50 parts by weight (solid conversion)
Fluorine leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass solvent (MIBK) 150 parts by mass The Martens hardness of the obtained first hard coat layer was 730 MPa.
Further, the solid silica fine particles were spherical solid silica fine particles.

(Example 14)
A second hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition E having the following composition was used instead of the hard coat layer composition A to produce a hard coat film for a touch panel. .

(Composition E for hard coat layer)
Urethane acrylate (UV7600B, manufactured by Nippon Gosei Co., Ltd.) 45 parts by mass Pentaerythritol triacrylate (M306, manufactured by Toagosei Co., Ltd.) 45 parts by mass Solid silica fine particles (average particle size 12 nm, MIBKSD, manufactured by Nissan Chemical Co., Ltd.) 10 parts by mass antifouling Agent (OPTOOL DAC, manufactured by Daikin Industries, Ltd.) 0.5 parts by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 500 MPa.

(Example 15)
A second hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition F having the following composition was used instead of the hard coat layer composition A to produce a hard coat film for a touch panel. .

(Composition F for hard coat layer)
Urethane acrylate (UX5000, manufactured by Nippon Kayaku Co., Ltd.) 25 parts by mass A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 50 parts by mass acrylate polymer (Acryt 8KX-012C, manufactured by Taisei Fine Chemical Co., Ltd.) )
25 parts by mass antifouling agent (RS71, manufactured by DIC) 0.5 parts by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 500 MPa.

(Example 16)
A second hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition G having the following composition was used in place of the hard coat layer composition A to produce a hard coat film for a touch panel. .

(Composition G for hard coat layer)
Urethane acrylate (UX5000, manufactured by Nippon Kayaku Co., Ltd.) 25 parts by mass A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 50 parts by mass acrylate polymer (Acryt 8KX-012C, manufactured by Taisei Fine Chemical Co., Ltd.) )
25 parts by mass antifouling agent (BYK-UV3510, manufactured by Big Chemie) 1 part by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 500 MPa.

(Example 17)
In the same manner as in Example 1, after forming the first hard coat layer and the second hard coat layer on the base film, it is opposite to the surface on which the first hard coat layer and the second hard coat layer of the base film are formed. A back surface hard coat layer (1) was formed on the side surface in the same manner as in the first hard coat layer of Example 1 except that the thickness was 3 μm, to produce a hard coat film for a touch panel.

(Example 18)
The back side hard coat layer (1) formed in the same manner as in Example 17 is the same as the second hard coat layer in Example 1 except that the thickness is 2 μm on the side opposite to the base film side. A coat layer (2) was formed to produce a hard coat film for a touch panel.

(Example 19)
In the same manner as in Example 1, after forming the first hard coat layer and the second hard coat layer on the base film, it is opposite to the surface on which the first hard coat layer and the second hard coat layer of the base film are formed. A back side hard coat layer (1) was formed on the side surface in the same manner as the second hard coat layer of Example 1 except that the thickness was 2 μm, to produce a hard coat film for a touch panel.

(Example 20)
Instead of using a 30 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Company) as a base film, a 30 μm-thick aramid film (product name: Mikutron, manufactured by Toray Industries, Inc.) was used. Produced a hard coat film for a touch panel in the same manner as in Example 1.

(Example 21)
Instead of a 30 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Co., Ltd.) as a base film, a 50 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Company Limited) A hard coat film for a touch panel was produced in the same manner as in Example 1 except that.

(Comparative Example 1)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the first hard coat layer was 3 μm and the thickness of the second hard coat layer was 3 μm.

(Comparative Example 2)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the second hard coat layer was not formed.

(Comparative Example 3)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the first hard coat layer was not formed.

(Comparative Example 4)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the first hard coat layer was 50 μm.

(Comparative Example 5)
A hard coat film for a touch panel was produced in the same manner as in Example 1 except that the thickness of the second hard coat layer was 25 μm.

(Comparative Example 6)
As a base film, a 30 μm-thick cycloolefin film (COP, manufactured by Nippon Zeon Co., Ltd.) was used instead of a 30 μm-thick polyimide film (Polyimide 1, Neoprim L-3450, manufactured by Mitsubishi Gas Chemical Company). A hard coat film for a touch panel was produced in the same manner as in Example 1.
(Comparative Example 7)
A second hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition 6 having the following composition was used instead of the hard coat layer composition A to produce a hard coat film for a touch panel. .

(Composition 6 for hard coat layer)
Mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 30 parts by mass atypical silica fine particles (average particle size 25 nm, manufactured by JGC Catalysts & Chemicals) 70 parts by mass (solid conversion)
Fluorine leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 1500 MPa.

(Comparative Example 8)
A second hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition H having the following composition was used instead of the hard coat layer composition A to produce a hard coat film for a touch panel. .

(Composition H for hard coat layer)
Urethane acrylate (UX5000, manufactured by Nippon Kayaku Co., Ltd.) 25 parts by mass A mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate (M403, manufactured by Toa Gosei Co., Ltd.) 50 parts by mass acrylate polymer (Acryt 8KX-012C, manufactured by Taisei Fine Chemical Co., Ltd.) )
25 parts by mass solid silica fine particles (average particle size 12 nm, MIBKSD, manufactured by Nissan Chemical Industries) 10 parts by mass non-reactive antifouling agent (F470, manufactured by DIC) 0.5 parts by mass (solid conversion)
Photopolymerization initiator (Irg184) 4 parts by mass Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained second hard coat layer was 500 MPa.

(Comparative Example 9)
A first hard coat layer was formed in the same manner as in Example 1 except that the hard coat layer composition 7 having the following composition was used instead of the hard coat layer composition 1 to produce a hard coat film for a touch panel. .

(Composition 7 for hard coat layer)
Polyethylene glycol diacrylate (M240, manufactured by Toagosei Co., Ltd.) 100 parts by mass photopolymerization initiator (Irg184) 4 parts by mass fluorine-based leveling agent (F568, manufactured by DIC) 0.2 parts by weight (solid conversion)
Solvent (MIBK) 150 parts by mass The Martens hardness of the obtained first hard coat layer was 250 MPa.

(Comparative Example 10)
The curing condition of the first hard coat layer is as follows. Using an ultraviolet irradiation device (manufactured by Fusion UV System Japan Co., Ltd., light source H bulb), the integrated light amount becomes 200 mJ / cm ² under the condition that the ultraviolet ray has an oxygen concentration of 200 ppm or less. A laminate for a touch panel was produced in the same manner as in Example 1 except that the coating film was cured by irradiation.

The following evaluation was performed about the hard coat film for touch panels obtained by the Example and the comparative example. The results are shown in Table 2.

(Durable folding test)
Samples produced by cutting the hard coat films for touch panels according to Examples and Comparative Examples into rectangles of 30 mm × 100 mm are bent in an endurance tester (DLDMMLH-FU, manufactured by Yuasa System Equipment Co., Ltd.) with a radius R of 1.5 mm. (Diameter: 3.0 mm) was attached, and the test of folding the entire surface 180 ° was performed 100,000 times so that the surface on which the hard coat layer of the sample was formed was inside, and evaluated according to the following criteria: .
○: No crack occurred in the sample ×: Crack occurred in the sample

(Pencil hardness)
The pencil hardness of the hard coat film for a touch panel according to Examples and Comparative Examples was measured based on JIS K5600-5-4 (1999) (1 kg load).

(Steel wool (SW) resistance)
Using the # 0000 steel wool (trade name: BON STAR, manufactured by Nippon Steel Wool Co., Ltd.), the outermost surface of the hard coat layer of the hard coat film for a touch panel according to Examples and Comparative Examples is a load of 1 kg / cm ² . The sample was rubbed back and forth 3500 times at a speed of 50 mm / sec.
○: No scratch ×: There was a scratch

(Anti-fouling property)
After writing with the oil-based marking pen on the outermost surface of the hard coat layer of the hard coat film for touch panels according to Examples and Comparative Examples, wiping with a cellulose-based non-woven wiper was attempted 20 times and evaluated according to the following criteria.
○: Wipe off ×: Wipe off

As shown in Table 2, the hard coat film for a touch panel according to the example was excellent in durable folding performance, scratch resistance and antifouling property, and had a pencil hardness of 7H or more.
On the other hand, the hard coat film for touch panels according to Comparative Examples 4 to 7 and 10 was inferior in durability folding performance. In addition, in the hard-coat film for touchscreens which concerns on the comparative example 10, since the adhesiveness of a 1st hard-coat layer and a 2nd hard-coat layer was bad, it was inferior to durable foldability. The hard coat films for touch panels according to Comparative Examples 1-3, 6 and 9 were inferior in pencil hardness, and the hard coat films for touch panels according to Comparative Examples 2 and 8 were inferior in scratch resistance and antifouling performance.
In addition, the hard coat film for a touch panel according to Comparative Examples 4 and 5 was strongly curled, and cracking occurred only by extending the curl in order to perform a durability folding test.

The hard-coat film for touchscreens of this invention can be used conveniently as a surface material of a foldable image display apparatus.

10 Hard Coat Film 11 for Touch Panel of the Present Invention 11 Fixing Part 12 Lower Fixing Part

Claims (9)

A hard coat film for a touch panel that is used as a surface material of a touch panel and has a base film and a hard coat layer,
A hard coat film for a touch panel satisfying the following (Condition 1) and (Condition 2).
(Condition 1) No cracking or breaking occurs when the test of folding the hard coat layer side surface of the touch panel hard coat film 180 ° at a spacing of 3 mm is repeated 100,000 times (Condition 2) The hard coat layer The hardness of the pencil hardness test (1 kg load) specified in JIS K5600-5-4 (1999) is 7H or more. The hard coat layer is provided on the base film side, and is provided on a surface opposite to the base film side of the first hard coat layer and the first hard coat layer for satisfying (Condition 2) ( The hard-coat film for touchscreens of Claim 1 which has a 2nd hard-coat layer for satisfying conditions 1). The second hard coat layer contains a cured product of a polyfunctional (meth) acrylate monomer as a resin component, and the first hard coat layer contains a cured product of a polyfunctional (meth) acrylate as a resin component, and the resin The hard-coat film for touchscreens of Claim 2 containing the silica fine particle disperse | distributed in the component. The hard coat film for a touch panel according to claim 3, wherein the silica fine particles are reactive silica fine particles. The base film is a polyethylene terephthalate film, a polyimide film, a triacetyl cellulose film, a polyethylene terephthalate film, a polyamideimide film, a polyetherimide film, a polyetherketone film, a polyamide film, or an aramid film. Hard coat film for touch panel as described in 3 or 4. The hard coat film for a touch panel according to claim 1, wherein the base film has a thickness of 10 to 100 μm. The hard coat film for a touch panel according to claim 1, further having antifouling performance. The hard coat film for a touch panel according to claim 1, further comprising a conductive layer. A foldable image display device comprising the hard coat film for a touch panel according to claim 1, 2, 3, 4, 5, 6, 7 or 8.

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