WO2016051247A1 - Anti-newton ring laminate, and capacitive touch panel using said anti-newton ring laminate - Google Patents

Abstract

The present invention pertains to a laminate comprising: a first layer having an uneven surface shape on at least one surface thereof; and a second layer having an uneven surface shape on at least one surface thereof. The uneven surface shape of the first layer and the uneven surface shape of the second layer have a thickness of 1-6μm, and a surface roughness greater than 10nm and less than 60nm. The laminate is formed by laminating the first layer and the second layer such that the uneven surface shape of the first layer and the uneven surface shape of the second layer face each other and make contact with each other.

Description

Anti-Newton ring laminate and capacitive touch panel using the anti-Newton ring laminate

The present invention relates to an anti-Newton ring laminate and a capacitive touch panel using the anti-Newton ring laminate.
This application claims the priority based on Japanese Patent Application No. 2014-199559 for which it applied on September 30, 2014, and uses the content here.

The touch panel is an electronic component that functions as a position input device, is combined with a display device such as a liquid crystal display, and is widely used in mobile phones and portable game machines. When the operator points to a specific position of the touch panel with the hand or an input pen based on the screen display, the device senses the information on the specific position, so that the operator can perform an appropriate operation desired by the operator. Interface. There are various types of touch panels depending on the operation principle of detecting the indicated position, and a resistance film type and a capacitance type are widely used. In particular, the capacitance type has been rapidly expanded mainly in mobile devices such as mobile phones. As a typical detection method of the electrostatic capacitance type, there are two types: a surface type for analog detection, and a projection type by an integrated detection method using patterned electrodes.

As the capacitive touch panel, a touch panel provided with a glass plate (hereinafter sometimes referred to as “sensor glass”) provided with a conductive layer on one side or both sides is usually used. A glass plate (hereinafter sometimes referred to as “cover glass”) is laminated on the side) via an adhesive layer. Moreover, in order to prevent damage to the cover glass and scattering of fragments, a protective film sheet (resin film) is further attached to the front side of the cover glass or the back side of the cover glass.

The touch panel is usually attached to the front surface of the display device using an adhesive. However, particularly when the display device is large, only the outer edge of the touch panel may be fixed with the adhesive from the viewpoint of cost.
As an example, FIG. 2 is a schematic cross-sectional view illustrating a configuration of a display device 300 with a capacitive touch panel in which only an outer edge portion of a conventional capacitive touch panel is fixed to the front surface of the display device with an adhesive. The display device 300 with a capacitive touch panel includes a liquid crystal display 311 having a polarizing plate 312 disposed on the forefront, and a capacitive touch panel 321. The capacitive touch panel 321 includes a base material layer 303, an uneven layer 306 formed on the back surface side of the base material layer 303, a conductive layer 302y formed on the front surface side of the base material layer 303, and a conductive layer 302y. An adhesive layer 307 provided on the front side, a conductive layer 302x provided on the front side of the adhesive layer 307, a cover glass 301 on the front side of the conductive layer 302x, and a printing layer 305 are provided. The conductive layer 302 x is formed on the back side of the cover glass 301, and the conductive layer 302 x is fixed to the conductive layer 302 y by an adhesive layer 307. The capacitive touch panel 321 is disposed on the front surface of the liquid crystal display 311 with a gap between the capacitive touch panel 321 and the liquid crystal display 311, and an outer edge portion is fixed to the liquid crystal display 311 with an adhesive layer 331. Thereby, a space is formed between the front surface of the liquid crystal display 311 and the back surface of the capacitive touch panel 321.

In the field of optical films, when a member such as a film comes into contact with another member (for example, a glass plate or another film), problems such as glare, Newton ring, and blocking may occur. In order to prevent these problems, a fine uneven shape may be provided on the surface of the film. In general, the size of the unevenness to be formed is set according to the required performance (antiglare, anti-Newton ring, anti-blocking), and the anti-glare is the largest and the anti-blocking is the smallest. As a method for forming such a concavo-convex shape, a method of containing particles in the hard coat layer, a method of depositing a specific resin component by phase separation, and the like are used (for example, Patent Documents 1 to 8). The capacitive touch panel 321 of FIG. 2 incorporates a film having a concavo-convex shape on one side (a concavo-convex layer 306 formed on one side of the base material layer 303) in order to provide anti-blocking performance.

In Patent Document 9, as an optical film for suppressing the occurrence of Newton's ring in a liquid crystal display, it is 0.03 μm or more and 0.15 μm or less, and the root mean square slope RΔq is 0.01 or more and 0.03 or less. An optical film having certain characteristics is disclosed. Patent Document 9 discloses an embodiment (FIG. 8) in which the optical film is disposed on the back side of a front member used for the purpose of design and the like in a liquid crystal display, and the display surface side of the display unit and the back side of the front member. And an embodiment (FIG. 9) in which the optical film is disposed on both. However, this optical film has not been able to sufficiently reduce haze, and in particular, has not had sufficient optical performance for use in recent high-definition displays. In addition, since the optical layer is thick, curling occurs when the base material is thin, and handling properties deteriorate.

Japanese Laid-Open Patent Publication No. 2010-042671 Japanese Unexamined Patent Application Publication No. 2010-066043 Japanese Unexamined Patent Publication No. 2011-033948 Japanese Unexamined Patent Publication No. 2012-206502 Japanese Patent No. 5181793 Japanese Unexamined Patent Publication No. 2003-045234 Japanese Patent No. 4392048 Japanese Unexamined Patent Publication No. 2007-182519 Japanese Unexamined Patent Publication No. 2010-066761

However, the conventional film having such irregularities has a further problem that Newton rings remain even after the stress is released when pressed against a smooth surface such as glass by stress. . This problem occurs when a touch panel attached with a display device applies stress to the touch panel when a user performs a touch operation, and the touch panel and the display device come into contact with each other. In the capacitive touch panel of FIG. 2, when the unevenness layer 306 is provided on the back surface of the base material layer 303 and the surface of the polarizing plate 312 is particularly smooth, the touch panel 321 is pressed by stress. The Newton ring can remain even after the stress is released. Furthermore, this problem becomes more prominent as the display device becomes larger. Moreover, such a problem becomes more prominent when the touch panel has one glass substrate. This is because a touch panel having a single glass substrate is likely to bend and distort, and is difficult to return while being in contact with the polarizing plate on the front surface of the display device near the center.

In addition, the conventional film having irregularities is provided with Newton's ring by reducing the contact area between the display device and the film on the premise that the surface of the display device that comes into contact with the film has high smoothness. Since it was configured under the technical idea of preventing the occurrence, it was necessary to have a large uneven shape to some extent. As a result, the conventional film has high haze values because large irregularities are formed. Therefore, there is room for further improvement of the conventional film so that the generation of Newton rings can be prevented while the haze value is lowered. As described above, it has been desired to have a high haze value as low as possible while having a high level of anti-Newton ring performance in which Newton rings do not remain even after the stress is released.

The present invention has been made in view of the above-described problems, and has excellent optical performance such as good touch surface brightness, and no Newton ring remains even after stress is released. An object is to provide an anti-Newton ring laminate and a capacitive touch panel using the anti-Newton ring laminate.

As a result of intensive studies, the inventors of the present invention include a first layer having an uneven surface shape on at least one surface and a second layer having an uneven surface shape on at least one surface, and the unevenness of the first layer. The surface shape of the first layer and the uneven surface shape of the second layer have a thickness of 1 to 6 μm and a surface roughness of more than 10 nm and less than 60 nm. The surface shape of the unevenness of the first layer and the second layer The present invention has been completed by finding that the above-mentioned problems can be solved by using a laminate in which the surface shapes of the irregularities face each other and the surface shapes of the irregularities are in contact with each other.

The present invention has the following aspects.
[1] A first layer having an uneven surface shape on at least one surface, and a second layer having an uneven surface shape on at least one surface,
The thickness of the uneven surface shape of the first layer and the uneven surface shape of the second layer is 1 to 6 μm, the surface roughness is greater than 10 nm and less than 60 nm,
A laminate in which the surface shape of the unevenness of the first layer and the surface shape of the unevenness of the second layer are opposed to each other and the surface shape of the unevenness is in contact with each other.
[2] The laminate according to [1], wherein the first layer and / or the second layer contains inorganic or organic fine particles having a particle diameter of 20 to 250 nm.
[3] The uneven surface of the first layer and / or the uneven surface of the second layer are formed uneven by phase separation of a resin composition containing at least two kinds of components [1] or [ 2].
[4] Of the uneven surface of the first layer and the uneven surface of the second layer, one is an uneven resin layer containing inorganic or organic fine particles having a particle diameter of 20 to 250 nm, and the other is at least two types The laminate according to any one of [1] to [3], wherein the resin composition containing components is an uneven resin layer formed by phase separation.
[5] The laminate according to any one of [1] to [4], wherein the first layer and the second layer have a haze greater than 0.6 and less than 7.0.
[6] A display device in which the laminate according to any one of [1] to [5] is incorporated.
[7] An optical film for incorporation in a display device having a touch panel function,
The optical film has an uneven surface shape on at least one surface, and the surface roughness of the surface having the uneven surface shape is larger than 10 nm and smaller than 60 nm,
At least two or more optical films are used in the same display device, and are arranged so that the surface shapes of the projections and recesses are in contact with each other.

However, in the present specification and claims, the surface roughness is a value measured by the following measuring method.
(Measurement method of surface roughness)
Using a micro laser microscope (measurement unit VK-X105 controller unit VK-X100 manufactured by KEYENCE Co., Ltd.), the surface of each resin film was observed and images were captured at a magnification of 200 times. For the obtained image, the measurement area is 100 μm × 100 μm, and the arithmetic average surface roughness Ra is calculated based on JIS B0601: 2001 using the analysis software attached to the traveling microlaser microscope.
Alternatively, a scanning probe microscope (Nanoscope IV and Nanoscope IIIa manufactured by Veeco Co., Ltd.) is used, an Si single crystal probe is used as a probe, a measurement mode is set to Taping mode, and an image is captured with a measurement area of 10 μm × 10 μm. The obtained image was subjected to flattening (0th order) once and planefit (XY) once as additional processing for removing waviness using the attached analysis software, and then surface roughness was determined. calculate.
In addition, the transparency of the laminate was measured using NDH4000 manufactured by Nippon Denshoku Co., Ltd. based on JIS K 7136.

According to the present invention, an anti-Newton ring laminate and an anti-Newton ring laminate in which Newton rings do not remain even after stress is released while having excellent optical performance such as good touch surface brightness. A capacitive touch panel using a body can be provided.

It is a schematic sectional drawing which shows an example of the anti-Newton ring laminated body of this invention. It is a schematic sectional drawing explaining the structure of the conventional display apparatus with an electrostatic capacitance type touch panel. It is a schematic sectional drawing explaining the structure of the display apparatus with an electrostatic capacitance type touch panel of the one aspect | mode using the anti-Newton ring laminated body of this invention. It is a schematic sectional drawing explaining the structure of the display apparatus with an electrostatic capacitance type touch panel of the other aspect using the anti-Newton ring laminated body of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic cross-sectional view showing an anti-Newton ring laminate 100 of the present invention. The anti-Newton ring laminated body 100 includes a first layer 110 and a second layer 120. The first layer 110 has a base material 111 and an uneven surface shape 112. Although the base material 111 is not limited, For example, it is a resin layer or glass plates, such as a polyethylene terephthalate (PET).
The uneven surface shape 112 is that the surface roughness is larger than 10 nm and smaller than 60 nm. The uneven surface shape 112 can be formed by, for example, applying a material such as a curable resin composition, which will be described later, onto the substrate 111 to form a coating film and curing the coating film. The second layer 120 has a base material 121 and an uneven surface shape 122. The details of the substrate 121 and the uneven surface shape 122 are the same as the details of the substrate 111 and the uneven surface shape 112.
The uneven surface shape 112 and the uneven surface shape 122 (the first layer 110 and the second layer 120) may be fixed to each other at the outer edge portion by an adhesive or a pressure sensitive adhesive. Alternatively, the first layer 110 and the second layer 120 may be fixed to each other at the outer edge portion by a fixing tool (not shown).
The concave / convex surface shape 112 and the concave / convex surface shape 122 are arranged to face each other and are stacked so as to be in contact with each other. The concave / convex surface shape 112 and the concave / convex surface shape 122 may not be in contact with each other, and are fixed in a non-contact state with respect to each other via an adhesive or an adhesive at the outer edge portion. The central portion may be laminated in a contact state or a contactable state.

Examples of films that can be used as the base materials 111 and 121 include polyethylene terephthalate film, polyethylene naphthalate film, polypropylene terephthalate film, polybutylene terephthalate film, polypropylene naphthalate film, polyethylene film, polypropylene film, cellophane, and diacetyl cellulose film. , Triacetyl cellulose film, acetyl cellulose butyrate film, polyvinyl chloride film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-vinyl acetate copolymer film, polystyrene film, polycarbonate film, polymethylpentene film, polysulfone film, poly Ether ether ketone film, polyester Ether sulfone film, polyether imide film, a polyimide film, a fluororesin film, a polyamide film, and acrylic resin film.
The film is preferably a polyethylene terephthalate film from the viewpoint of weather resistance, solvent resistance, rigidity, cost, and the like.
The base materials 111 and 121 are preferably transparent to the extent that they can be used for optical applications.

The base materials 111 and 121 may contain various additives. Examples of the additive include antioxidants, heat stabilizers, ultraviolet absorbers, organic particles, inorganic particles, pigments, dyes, antistatic agents, nucleating agents, and coupling agents.
The base materials 111 and 121 may be subjected to a surface treatment in order to improve adhesion with the uneven surface shapes 112 and 122. Examples of the surface treatment include surface roughening treatment such as sandblast treatment or solvent treatment, corona discharge treatment, chromic acid treatment, flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like.
When the base materials 111 and 121 are films, the thickness of the base materials 111 and 121 is preferably 10 to 300 μm, more preferably 30 to 200 μm, from the viewpoint of securing strength, curling prevention, and the like. A thickness of 35 to 130 μm is particularly preferable. When the base materials 111 and 121 are glass, the thickness of the base materials 111 and 121 is preferably 0.1 mm or more, and more preferably 0.2 mm or more.

The substrates 111 and 121 may be glass polarizing plates or resin polarizing plates. For example, in the capacitive touch panel 200 of FIG. 3 to be described later, the polarizing plate 12 constituting the forefront of the liquid crystal display 11 functions as one of the base material 111 or the base material 121, and the base material 3 is the base material 111 or the base material. It can function as the other side of the material 121. Similarly, in the capacitive touch panel 201 of FIG. 4, the polarizing plate 12 constituting the forefront of the liquid crystal display 11 functions as one of the base material 111 and the base material 121, and the base material 3 b is the base material 111 or the base material. It can function as the other side of the material 121.

The uneven surface shapes 112 and 122 are provided to provide anti-Newton ring performance and the like. In the capacitive touch panel 200 of FIG. 3, the uneven surface shape 4 a corresponds to the uneven surface shape 112, and the uneven surface shape 4 b corresponds to the uneven surface shape 122. In the capacitive touch panel 201 of FIG. 4, the uneven surface shape 4 a corresponds to the uneven surface shape 112, and the uneven surface shape 4 b corresponds to the uneven surface shape 122.
The uneven surface shapes 112 and 122 are formed by applying a coating liquid for forming a hard coat layer containing a thermosetting or active energy ray-curable resin component on a base material (base material 111 or base material 121). Can be formed by forming a coating film and curing the coating film. Specifically, as a method for forming irregularities, a method of blending particles in the resin layer forming material, the resin layer forming material containing two resin components having different solubility parameter (SP) values, and after coating, For example, a method of precipitating one resin component by phase separation may be used.

In the present invention, when the resin layer forming material does not substantially undergo phase separation, the resin layer forming material preferably contains inorganic or organic fine particles having a particle diameter of less than 250 nm. When the resin layer forming material contains a resin component that substantially undergoes phase separation, the resin layer forming material preferably does not substantially contain inorganic or organic fine particles having a particle diameter of less than 250 nm. By using any of these resin layer forming materials, the anti-Newton ring laminate of the present invention has both excellent optical performance and anti-Newton ring performance.
The phrase “substantially no phase separation” means that the resin component for phase separation is not substantially contained in the resin layer forming material (composition). For example, when the resin layer forming material is composed of two resin components having different solubility parameter (SP) values, the difference in SP value between the two resin components is 1.0 or more, and the resin component having the smaller amount The content of is preferably 3% by mass or less when the total mass of the resin layer forming material is 100% by mass. More preferably, it is 2 mass% or less, More preferably, it is 1 mass% or less, Most preferably, it is 0.1 mass% or less.
Further, when the resin layer forming material (composition) is to be phase-separated, when the total mass of the resin layer forming material is 100% by mass, the content of inorganic or organic fine particles having a particle diameter of less than 250 nm is: It is preferable that it is 3 mass% or less. More preferably, it is 2 mass% or less, More preferably, it is 1 mass% or less, Most preferably, it is 0.1 mass% or less.

Examples of the thermosetting resin component include phenol resin, urea resin, diallyl phthalate resin, melamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, silicon resin, polysiloxane resin, and the like.
The active energy ray-curable resin component contains a monomer having a polymerizable unsaturated group (for example, a group containing a polymerizable unsaturated bond such as an ethylenic double bond) that can be polymerized by irradiation with active energy rays. Things. If necessary, a photopolymerization initiator or the like is blended with the active energy ray-curable resin component.

In the uneven surface shapes 112 and 122, in particular, a resin layer forming composition containing a polyfunctional (meth) acrylic monomer and particles (hereinafter referred to as “resin layer forming composition (X)”) is an active energy ray. It is preferable that it is the hardened | cured material hardened | cured with. Such a cured product is excellent in surface hardness, transparency, scratch resistance, and the like because the base material (portion other than particles) contains a hard acrylic polymer having a crosslinked structure. Moreover, the anti-Newton ring laminated body 100 suppresses shrinkage | contraction of a laminated body when the uneven | corrugated surface shape 112 and the uneven | corrugated surface shape 122 contain particle | grains, when the composition (X) for resin layer formation is hardened. Is done.

“Polyfunctional” means having two or more polymerizable unsaturated groups, and “(meth) acrylic monomer” is a compound having at least a (meth) acryloyl group as a polymerizable unsaturated group. “(Meth) acryloyl group” means an acryloyl group or a methacryloyl group.
Examples of the polyfunctional (meth) acrylic monomer include dipropylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, and 1,6-hexanediol di ( (Meth) acrylate, neopentyl glycol di (meth) acrylate, propylene oxide modified neopentyl glycol di (meth) acrylate, neopentyl glycol adipate di (meth) acrylate, hydroxypivalate neopentyl glycol di (meth) acrylate, dicyclopenta Nildi (meth) acrylate, caprolactone-modified dicyclopentenyl di (meth) acrylate, polyethylene glycol (preferably mass average molecular weight 400-600) di (meth) acrylate, modified Bifunctional such as bisphenol A di (meth) acrylate, tricyclodecane dimethanol di (meth) acrylate, ethylene oxide modified phosphoric acid di (meth) acrylate, allylated cyclohexyl di (meth) acrylate, isocyanurate di (meth) acrylate (Meth) acrylate; pentaerythritol tri (meth) acrylate, diventaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethoxytri (meth) ) Acrylate, ethylene oxide modified trimethylolpropane tri (meth) acrylate, propylene oxide modified trimethylolpropane tri (meth) acrylate, poly Trifunctional (meth) acrylates such as ether tri (meth) acrylate, glycerin propoxytri (meth) acrylate, tris (acryloxyethyl) isocyanurate; pentaerythritol tetra (meth) acrylate, pentaerythritol ethoxytetra (meth) acrylate, ditri Tetrafunctional (meth) acrylates such as methylolpropane tetra (meth) acrylate; dipentaerythritol penta (meth) acrylate, propionic acid-modified dipentaerythritol penta (meth) acrylate, dipentaerythritol monohydroxypenta (meth) acrylate, dipenta 5 or more functional (meth) acrylates such as erythritol hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate Relate; and the like.
These polyfunctional (meth) acrylic monomers may be used individually by 1 type, and can also be used in combination of 2 or more type.

The polyfunctional (meth) acrylic monomer preferably contains a tetrafunctional or higher (preferably pentafunctional or higher, more preferably hexafunctional) (meth) acrylic monomer. A tetrafunctional or higher functional (meth) acrylic monomer contributes to an improvement in hardness.
In all polyfunctional (meth) acrylic monomers, the proportion of tetrafunctional or higher (meth) acrylic monomers is preferably 50% by mass or more, more preferably 60% by mass or more, further preferably 70% by mass or more, and 80% by mass or more. Is most preferred.

The particles contained in the resin layer forming composition (X) may be inorganic particles or organic particles. As the inorganic particles, those having high hardness are preferable. For example, inorganic oxide particles such as silicon dioxide particles, titanium dioxide particles, zirconium oxide particles, aluminum oxide particles, tin dioxide particles, antimony pentoxide particles, and antimony trioxide particles are used. Can be used.
The inorganic particles may be reactive inorganic oxide particles obtained by treating the inorganic oxide particles with a coupling agent. By treating with a coupling agent, the bonding strength with the acrylic polymer can be increased. As a result, the surface hardness and scratch resistance can be improved, and further, the dispersibility of the inorganic oxide particles can be improved.
Examples of the coupling agent include γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-mercaptopropyltrimethoxy. Examples thereof include silane, γ-aminopropyltriethoxysilane, and γ-aminopropyltriethoxyaluminum. These may be used individually by 1 type and may use 2 or more types together.
The treatment amount of the coupling agent is preferably 0.1 to 20 parts by mass, and more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the inorganic oxide particles.

Examples of organic particles that can be used include resin particles such as acrylic resin, polystyrene, polysiloxane, melamine resin, benzoguanamine resin, polytetrafluoroethylene, cellulose acetate, polycarbonate, and polyamide.
The organic particles may be reactive resin particles obtained by treating the resin particles with a coupling agent. By treating with a coupling agent, the bonding strength with the acrylic polymer can be increased. As a result, the surface hardness and scratch resistance can be improved, and further the dispersibility of the resin particles can be improved.
The coupling agent and its treatment amount are the same as the coupling agent and its treatment amount mentioned for the reactive inorganic oxide particles.

The particle diameter of the particles is less than 250 nm in order to achieve both sufficient anti-Newton ring performance and excellent optical performance. The particle diameter of the particles is preferably 10 nm to 200 nm, more preferably 20 nm to 150 nm, and still more preferably 30 nm to 100 nm.
The blending amount of the particles is preferably 1 to 20% by mass, more preferably 3 to 15% by mass, and further preferably 5 to 10% by mass in the solid content of the resin layer forming composition (X). When the compounding amount of the particles is within these preferable ranges, the anti-Newton ring performance is further improved. Further, when it is 1% by mass or more, the anti-Newton ring performance is improved, and when it is 20% by mass or less, a sufficient amount of polyfunctional (meth) acrylic monomer can be blended, so that the hard coat performance is good.
In addition, solid content shows the sum total of all the components which comprise the composition (X) for resin layer formation, when a solvent is not included, and shows the sum total of all the components except a solvent when it contains a solvent.

The resin layer forming composition (X) preferably contains a photopolymerization initiator together with the polyfunctional (meth) acrylic monomer and particles in order to promote curing.
Known photopolymerization initiators can be used such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2- Dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4 (Methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4, '-Diethylaminobenzophenone, propiophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiarybutylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2 , 4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethyl ketal, acetophenone dimethyl ketal, p-dimethylamine benzoate and the like. These photoinitiators may be used individually by 1 type, and may be used in combination of 2 or more type.
The blending amount of the photopolymerization initiator is preferably 0.5 to 10% by mass and more preferably 2 to 8% by mass in the solid content of the resin layer forming composition (X). When it is 0.5% by mass or more, poor curing hardly occurs. Even if it mixes exceeding 10 mass%, the hardening acceleration | stimulation effect corresponding to a compounding quantity is not acquired, but cost also becomes high. Moreover, it may remain in the cured product and cause yellowing and bleeding out.

In addition to the photopolymerization initiator, a photosensitizer can be further contained. Examples of the photosensitizer include n-butylamine, triethylamine, and tri-n-butylphosphine.

The resin layer forming composition (X) may contain other components than the above as long as the effects of the present invention are not impaired, if necessary. For example, known additions used to impart other functions (water repellency, oil repellency, antifouling properties, coating suitability, antistatic properties, ultraviolet shielding properties, etc.) other than scratch resistance to the concavo-convex resin layer An agent can be included. Examples of such additives include fluorine compounds, polysiloxane compounds, metal oxide fine particles, antistatic resins, conductive polymers, ultraviolet absorbers, and the like. By adding a fluorine-based compound, water / oil repellency, antifouling effect that makes it difficult for dirt to adhere and easily wipes off the attached dirt can be imparted. Further, by adding a polysiloxane compound, imparting water repellency, antifouling effect that makes it difficult for dirt to adhere and easily wipes off the attached dirt, and improves coating suitability. In addition, antistatic properties can be imparted by adding metal oxide fine particles, antistatic resins, or conductive polymers. Moreover, ultraviolet shielding properties can be imparted by adding metal oxide fine particles or ultraviolet absorbers.

The resin layer forming composition (X) may contain a solvent.
Examples of the solvent include methanol, ethanol, isopropanol, acetone, methyl ethyl ketone, toluene, n-hexane, n-butyl alcohol, methyl isobutyl ketone, methyl butyl ketone, ethyl butyl ketone, cyclohexanone, ethyl acetate, butyl acetate, propylene glycol monomethyl. Ether acetate, ethylene glycol monoethyl ether, propylene glycol monomethyl ether, N-methyl-2-pyrrolidone and the like are used. These may be used alone or in combination of two or more.
For the purpose of reducing coating unevenness, two or more solvents having different evaporation rates may be used in combination. For example, at least two kinds selected from methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, butyl acetate, and propylene glycol monomethyl ether can be mixed and used.

The uneven surface shapes 112 and 122 are formed by applying a resin layer forming material such as the resin layer forming composition (X) to the surfaces of the base materials 111 and 121 to form a coating film, and curing the coating film. Can be formed.
Examples of the coating method for the resin layer forming material include a blade coater, an air knife coater, a roll coater, a bar coater, a gravure coater, a micro gravure coater, a rod blade coater, a lip coater, a die coater, a curtain coater, and a printing machine. The method used is mentioned.
The coating amount of the resin layer forming material is set according to the thickness of the uneven surface shapes 112 and 122.
The thickness of the uneven surface shapes 112 and 122 is preferably 1 to 6 μm, and more preferably 2 to 5 μm. When the thickness is 1 μm or more, sufficient hard coat performance can be obtained. When it is 6 μm or less, it is excellent in transparency, substrate adhesion, curl resistance and the like.
Note that the thickness of the thinnest part of the uneven surface shapes 112 and 122 (the distance from the bottom of the recesses present in the uneven surface shapes 112 and 122 to the surface on the base material 111 and 121 side) is defined as the uneven surface shape 112. , 122.

The uneven surface shapes 112 and 122 are preferably subjected to heat drying after the coating film is formed and before the coating film is cured. The heat drying conditions are preferably 60 ° C. to 100 ° C. and 30 seconds to 90 seconds, for example. More preferably, they are 70 ° C. to 90 ° C. and 45 seconds to 75 seconds. By performing heat drying under the above-mentioned preferable conditions, the laminate of the present invention has both excellent optical performance and sufficient anti-Newton ring performance.

When the resin layer forming material is active energy ray curable like the resin layer forming composition (X), the coating film can be cured by irradiation with active energy rays. When the resin layer forming material is thermosetting, it can be cured by heating using a heating furnace or an infrared lamp.
Examples of the active energy rays include ionizing radiation such as ultraviolet rays, electron beams, visible rays, and γ rays. Among them, ultraviolet rays are preferable from the viewpoint of versatility. As the ultraviolet light source, for example, a high pressure mercury lamp, a low pressure mercury lamp, an ultrahigh pressure mercury lamp, a metal halide lamp, a carbon arc, a xenon arc, an electrodeless ultraviolet lamp, or the like can be used.
As the electron beam, for example, an electron beam emitted from various electron beam accelerators such as a cockloftwald type, a bandecraft type, a resonant transformation type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type can be used.
Curing by irradiation with active energy rays is preferably performed in the presence of an inert gas such as nitrogen.
Curing may be performed in one stage, or may be performed in two stages, a preliminary curing process and a main curing process.

The anti-Newton ring laminate 100 of the present invention preferably has a total light transmittance of 90% or more. The laminate has a haze of 1.5% or less, preferably 1.3% or less, more preferably 1.2% or less, and 1.1% or less. More preferably, it is still more preferably 1.0% or less, and most preferably 0.9% or less. Satisfying these requirements is useful as an optical member for touch panels and display devices.
The total light transmittance and haze can be measured by methods based on JIS K7361-1 and JISK7136, respectively.

FIG. 3 is a schematic cross-sectional view illustrating the configuration of a display device 200 with a capacitive touch panel using one embodiment of the anti-Newton ring laminate 100 of the present invention.
The display device 200 with a capacitive touch panel includes a liquid crystal display 11 in which a polarizing plate 12 on which an uneven surface-shaped layer 4 b is formed is disposed on the forefront, and a capacitive touch panel 25. The touch panel 25 is disposed on the front surface of the liquid crystal display 11 with a gap between the touch panel 25 and the liquid crystal display 11, and an outer edge portion is fixed to the liquid crystal display 11 with an adhesive layer 31. Thereby, a space is formed between the front surface of the liquid crystal display 11 and the back surface of the touch panel 25.
The touch panel 25 includes a glass substrate 1, a conductive layer 2x formed on the back surface of the glass substrate, an adhesive layer 7, a printing layer 5, a base material 3, and a conductive layer 2y formed on the front surface of the base material 3. And an uneven surface shape 4 a formed on the back surface of the substrate 3. The glass substrate 1 and the conductive layer 2x are in close contact with the front surface of the conductive layer 2y by the adhesive layer 7. A printed layer 5 is formed on the outer edge of the front surface of the conductive layer 2y.
The conductive layer 2x is a conductive layer for detecting a position in the horizontal axis direction, and the conductive layer 2y is a conductive layer for detecting a position in the vertical axis direction.
The uneven surface shape 4 a faces the liquid crystal display device 11.
In the present specification and claims, the “front surface” means a surface on the side that the user visually recognizes and operates when using a capacitive touch panel or a display device to which the capacitive touch panel is attached. The “back surface” means a surface on the opposite side to the side visually recognized and operated by the user. The front surface of the touch panel is sometimes referred to as a touch surface.

[Liquid Crystal Display 11]
It does not specifically limit as the liquid crystal display 11, A well-known liquid crystal display can be used except using the polarizing plate 12 in which the uneven | corrugated surface-shaped layer 4b was formed in the surface.

[Touch panel 25]
(Glass substrate 1)
As the glass substrate 1, a known glass plate used for a touch panel or the like can be used.
The thickness of the glass substrate 1 is preferably 0.1 mm or more, and more preferably 0.2 mm or more. If the thickness is 0.1 mm or more, the strength of the touch panel 11 is sufficient. The upper limit is not particularly limited, but if it exceeds 3 mm, deflection and distortion do not occur so much, and Newton's rings are less likely to occur. Therefore, in view of the usefulness of the present invention and transparency, it is preferably 3 mm or less. 2 mm or less is more preferable.

(Conductive layers 2x, 2y)
The conductive layers 2x and 2y are transparent conductive films.
The conductive layers 2x and 2y may be a uniform layer formed with a substantially uniform thickness used for a surface capacitive touch panel or the like, or used for a projected capacitive touch panel or the like. The conductive layer may have a regular pattern formed for position detection. Even in the case of a uniform layer, part of the conductive layers 2x and 2y may be patterned in order to form lead electrodes and the like depending on the configuration of the touch panel.

Examples of the material of the conductive layers 2x and 2y include metals such as gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium, iron, cobalt, tin, and alloys thereof; indium-tin oxide (Indium Metal oxides such as Tin Oxide (ITO), Indium-Zinc Oxide (IZO), Zinc Oxide (ZnO), Zinc-Tin Oxide (ZTO); Other metal compounds composed of copper iodide or the like; conductive resins such as PEDOT / PSS; The PEDOT / PSS is a polymer complex in which PEDOT (3,4-ethylenedioxythiophene polymer) and PSS (styrene sulfonic acid polymer) coexist.
The thicknesses of the conductive layers 2x and 2y are set in consideration of conductivity, transparency, and the like. The conductivity of the conductive layers 2x and 2y is preferably 10 ⁵ Ω / sq or less, and more preferably 10 ³ Ω / sq or less, as a surface resistance, in order to provide an electrode plate for a touch panel. Such surface resistance can be generally achieved by setting the thickness to 30 to 600 mm in the case of a metal system and to 80 to 5,000 mm in the case of a metal oxide system.

The conductive layers 2x and 2y can be formed by a known method.
For example, when the conductive layer 2 is a uniform layer, a thin film forming method such as a vacuum deposition method, a sputtering method, an ion plating method, a spray pyrolysis method, a chemical plating method, an electroplating method, a coating method, or a combination thereof can be used. Can be mentioned. From the viewpoints of film formation speed, large-area film formability, productivity, and the like, vacuum vapor deposition and sputtering are preferred.
The regular pattern may be formed by a method in which the conductive layers 2x and 2y are partially provided in advance on the surfaces of the glass substrate 1 and the base material 3 by various printing methods, or a uniform layer as described above. After forming, a part thereof may be removed by etching or the like.
In order to improve the adhesion between the conductive layers 2x and 2y and the glass substrate 1 and the base material 3, the surfaces of the glass substrate 1 and the base material 3 are subjected to corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, sputter etching treatment, undercoat. Appropriate pretreatment such as treatment may be performed.

(Adhesive layer 7)
As an adhesive which comprises the adhesion layer 7, the well-known adhesive used for optical uses, such as a touch panel, respectively can be utilized. Examples of the pressure sensitive adhesive include natural rubber pressure sensitive adhesive, synthetic rubber pressure sensitive adhesive, acrylic pressure sensitive adhesive, urethane pressure sensitive adhesive, and silicone pressure sensitive adhesive. The pressure-sensitive adhesive may be any of a solvent system, a solventless system, an emulsion system, and an aqueous system. Of these, acrylic pressure-sensitive adhesives, particularly solvent-based ones are preferred from the viewpoints of transparency, weather resistance, durability, cost, and the like.
Other auxiliary agents may be added to the adhesive as necessary. Other auxiliary agents include antioxidants, tackifiers, silane coupling agents, UV absorbers, hindered amine compounds and other light stabilizers, thickeners, pH adjusters, binders, crosslinking agents, adhesive particles, Examples include antifoaming agents, antiseptic / antifungal agents, pigments, inorganic fillers, stabilizers, wetting agents, wetting agents and the like.
The thickness of the pressure-sensitive adhesive layer 7 is preferably 10 to 100 μm, and more preferably 20 to 80 μm. If it is 10 μm or more, sufficient adhesiveness can be obtained. If the thickness of the pressure-sensitive adhesive layer 7 exceeds 100 μm, it is disadvantageous from the viewpoint of thinning and cost.

An uneven surface shape 4 a is formed on the back surface of the substrate 3. An uneven surface shape 4 b is formed on the front surface of the polarizing plate 12.
By making the surface roughness larger than 10 nm and smaller than 60 nm, the uneven surface shape 4 a comes into contact with the uneven surface shape 4 b when the glass plate 1 bends in the direction of the liquid crystal display device 11. However, Newton's rings are less likely to occur and remain less likely to remain.
Since the surface roughness is larger than 10 nm, the contact area between the first layer and the second layer is small compared to the case where there are no irregularities on both sides or one side, and it is easy to leave, so that an excellent anti-Newton ring effect is obtained. Demonstrated. The surface roughness is preferably 13 nm or more, and more preferably 15 nm or more.
When the surface roughness is less than 60 nm, the haze of the laminate is small, the transparency of the laminate is high, and the brightness of the touch surface is difficult to be impaired. The surface roughness is preferably less than 50 nm, more preferably less than 40 nm, and particularly preferably less than 30 nm.
The surface shape of the unevenness that satisfies the surface roughness can be obtained according to the materials and conditions of the examples and comparative examples described in this specification.

FIG. 4 is a schematic cross-sectional view illustrating the configuration of a display device 201 with a capacitive touch panel according to another aspect using the anti-Newton ring laminate of the present invention.
A display device 201 with a capacitive touch panel shown in FIG. 4 includes a liquid crystal display 11 and a touch panel 21. The touch panel 21 includes a glass substrate 1, an adhesive layer 7, a conductive layer 2x, a first base material 3a, an adhesive layer 17, a conductive layer 2y, a second base material 3b, and a second base material. And a concave-convex surface shape 4a formed on the back surface of 3b.
The back surface of the glass substrate 1 and the front surface of the conductive layer 2 x are in close contact with each other through the adhesive layer 7. The back surface of the first substrate 3 a and the front surface of the conductive layer 2 y are in close contact with each other via the adhesive layer 17. A printed layer 5 is formed on the outer edge of the front surface of the conductive layer 2x.
The conductive layer 2x is a conductive layer for detecting a position in the horizontal axis direction, and the conductive layer 2y is a conductive layer for detecting a position in the vertical axis direction. The conductive layer 2x may be a conductive layer for detecting a position in the vertical axis direction, and the conductive layer 2y may be a conductive layer for detecting a position in the horizontal axis direction. The adhesive layer 17 is an insulating adhesive layer.
The uneven surface shape 4a faces the uneven surface shape 4b. The uneven surface shapes 4a and 4b have a surface roughness larger than 10 nm and smaller than 60 nm. A preferable range of the surface roughness is the same as the surface roughness of the display device 200 with a capacitive touch panel.

The conductive film sheet of the present invention and the touch panel using the same have been described above, but the present invention is not limited to these.
For example, in the above description, an example in which a liquid crystal display is used as a display device has been shown, but the present invention is not limited to this. For example, various display devices such as a cathode ray tube (CRT) display, a plasma display, and an electroluminescence (EL) display can be used.

Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

(Preparation of resin film A1)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), colloidal silica dispersion (organosilica sol L type, 20 parts by mass of a solid content concentration of 30%, manufactured by Nissan Chemical Industries, Ltd., and 4 parts by mass of a photopolymerization initiator (trade names: IRGACURE 184, manufactured by BASF Corporation) were mixed. A resin layer forming composition A was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. On this base material, the resin layer forming composition A was bar-coated. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition A applied to the substrate was cured to form a resin layer having a thickness of 5 μm. In this way, a resin film A1 was obtained.
(Preparation of resin film A2)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), colloidal silica dispersion (organosilica sol L type, 20 parts by mass of a solid content concentration of 30%, manufactured by Nissan Chemical Industries, Ltd., and 4 parts by mass of a photopolymerization initiator (trade names: IRGACURE 184, manufactured by BASF Corporation) were mixed. A resin layer forming composition A was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. On this base material, the resin layer forming composition A was bar-coated. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition A applied to the substrate was cured to form a resin layer having a thickness of 2 μm. In this way, a resin film A2 was obtained.
(Preparation of resin film A3)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), colloidal silica dispersion (organosilica sol L type, 20 parts by mass of a solid content concentration of 30%, manufactured by Nissan Chemical Industries, Ltd., and 4 parts by mass of a photopolymerization initiator (trade names: IRGACURE 184, manufactured by BASF Corporation) were mixed. A resin layer forming composition A was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. On this base material, the resin layer forming composition A was bar-coated. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition A applied to the substrate was cured to form a resin layer having a thickness of 7 μm. In this way, a resin film A3 was obtained.
(Preparation of resin film A4)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), colloidal silica dispersion (organosilica sol L type, 20 parts by mass of a solid content concentration of 30%, manufactured by Nissan Chemical Industries, Ltd., and 4 parts by mass of a photopolymerization initiator (trade names: IRGACURE 184, manufactured by BASF Corporation) were mixed. A resin layer forming composition A was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. On this base material, the resin layer forming composition A was bar-coated. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition A applied to the substrate was cured to form a resin layer having a thickness of 0.5 μm. In this way, a resin film A4 was obtained.

(Preparation of resin film B1)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), particle size 100 nm colloidal silica dispersion (organosilica sol Z type, solid A partial concentration of 30%, manufactured by Nissan Chemical Industries, Ltd.) 20 parts by mass, and a photopolymerization initiator (trade name IRGACURE 184, manufactured by BASF Corporation) were mixed by 4 parts by mass. A resin layer forming composition B was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. The resin layer forming composition B was bar coated on this substrate. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition B applied to the base material was cured to form a resin layer having a thickness of 5 μm. In this way, a resin film B1 was obtained.

(Preparation of resin film C1)
Resin layer forming composition C (trade name: Lucifral NAB-007, solid content concentration: 40%, manufactured by Nippon Paint Co., Ltd.) that forms surface irregularities by phase separation is used as a substrate (100 μm thick PET film, trade name: A4300, Toyo Bar coating was applied to the surface of a spinning company. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition C applied to the substrate was cured to form a resin layer having a thickness of 5 μm. Thus, a resin film C1 was obtained.

(Preparation of resin film D1)
As a polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.) and a colloidal silica dispersion (trade name PL-2L having a particle diameter of 20 nm) -30 parts by mass of MEK, solid content concentration 20%, manufactured by Fuso Chemical Industries Co., Ltd., and 4 parts by mass of a photopolymerization initiator (trade names: IRGACURE 184, manufactured by BASF Corporation). A resin layer forming composition D was prepared by diluting this mixture with methyl ethyl ketone to a solid content concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. On this base material, the resin layer forming composition D was bar-coated. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition D applied to the substrate was cured to form a resin layer having a thickness of 5 μm. In this way, a resin film D1 was obtained.
(Preparation of resin film E1)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), 1400 nm silica particles (trade name: Silicia 310, Fuji Silysia Chemical Co., Ltd.) 6 parts by mass of a company) and 4 parts by mass of a photopolymerization initiator (trade name: IRGACURE 184, manufactured by BASF Corporation) were mixed. A resin layer forming composition E was prepared by diluting the mixture with methyl ethyl ketone to a solid content concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. The resin layer forming composition E was bar coated on this substrate. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition E applied to the substrate was cured to form a resin layer having a thickness of 5 μm. In this way, a resin film E1 was obtained.

(Preparation of resin film F1)
As polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), 4100 nm silica particles (trade name: Silicia 430, Fuji Silysia Chemical Co., Ltd.) 6 parts by mass of a company) and 4 parts by mass of a photopolymerization initiator (trade name: IRGACURE 184, manufactured by BASF Corporation) were mixed. A resin layer forming composition F was prepared by diluting the mixture with methyl ethyl ketone to a solid content concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. On this base material, the resin layer-forming composition F was bar-coated. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition F applied to the substrate was cured to form a resin layer having a thickness of 5 μm. Thus, a resin film F1 was obtained.

(Preparation of resin film G1)
A composition having a refractive index of 1.65 (trade name: OPSTARORKZ6719, solid content: 20%, manufactured by JSR Corporation) was coated on a base of a PET film having a thickness of 100 μm. The substrate was heat-dried at 80 ° C. for 60 seconds. Thereby, a high refractive layer having a thickness of 0.2 μm was formed. Furthermore, the resin layer forming composition A was coated on the high refractive layer in the same manner as in the production of the resin film A1 to produce a resin film G1.

(Preparation of resin film H1)
As a polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.) and a photopolymerization initiator (trade name IRGACURE 184, manufactured by BASF Corporation) ) 4 parts by mass were mixed. A resin layer forming composition H was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. The resin layer forming composition H was bar-coated on this substrate. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition H applied to the substrate was cured to a resin layer having a thickness of 5 μm. In this way, a resin film H1 was obtained.

(Preparation of resin film I1)
As a polyfunctional (meth) acrylate, 100 parts by mass of dipentaerythritol hexaacrylate (hexafunctional acrylate, trade name: A-DPH, manufactured by Shin-Nakamura Chemical Co., Ltd.), colloidal silica dispersion with a particle diameter of 10 nm (organosilica sol standard type, 10 mass parts of solid content concentration 30%, the product made from Nissan Chemical Industries Ltd., and 4 mass parts of photoinitiators (brand name IRGACURE184, the product made from BASF) were mixed. A resin layer forming composition I was prepared by diluting this mixture with methyl ethyl ketone so as to have a solid concentration of 50%.
A PET film (trade name: A4300, manufactured by Toyobo Co., Ltd.) having a thickness of 100 μm was used as the substrate. The resin layer forming composition I was bar coated on this substrate. Thereafter, the substrate was heated and dried at 80 ° C. for 60 seconds. Then, using a high-pressure mercury lamp ultraviolet irradiator (manufactured by Eye Graphics Co., Ltd.), 160 W / cm, a lamp height of 13 cm, a belt speed of 10 m / min, 2 pass, and an ultraviolet ray in a nitrogen atmosphere. Irradiated. Thereby, the composition I applied to the substrate was cured to form a resin layer having a thickness of 5 μm. In this way, a resin film I1 was obtained.

(Measurement method of surface roughness)
Using a micro laser microscope (measurement unit VK-X105 controller unit VK-X100 manufactured by KEYENCE Co., Ltd.), the surface of each resin film was observed and images were captured at a magnification of 200 times. With respect to the obtained image, the arithmetic average surface roughness Ra was calculated based on JIS B0601: 2001 using analysis software attached to the traveling microlaser microscope with a measurement area of 100 μm × 100 μm.

<Evaluation of haze (transparency)>
The haze value of the obtained resin film and laminated body was measured using NDH4000 made by Nippon Denshoku Industries Co., Ltd. based on JIS K7136.
<Evaluation of curls>
The obtained resin film was cut into a size of 100 mm length × 100 mm width and left for 1 day in an environment of 23 ° C. and humidity 50% RH. Thereafter, the resin film was placed on a horizontal plane, and the floating of the four corners was measured. The four corner floats are distances from the horizontal plane to the four corners of the resin film in a direction perpendicular to the horizontal plane. The average value was calculated as curl. A case where the curl was 0 to 10 mm was evaluated as ◯. The case where the curl was 11 mm or more was evaluated as x.

<Evaluation of Newton ring generation>
Two resin films were prepared, placed with the resin layers facing each other, and pressed with a finger from the opposite surface of the resin layer. Thereafter, the stress was released, and the presence or absence of Newton ring generation after 5 seconds was visually confirmed. At this time, the case where no Newton ring was generated was evaluated as ◯. Moreover, the case where Newton ring generate | occur | produces or the case where the resin films have adhered is evaluated as x.

<Example 1>
Two resin films A1 were prepared and arranged so that the respective resin layers face each other, thereby producing a laminate.
<Example 2>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film B1.
<Example 3>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film C1.
<Example 4>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film D1.
<Example 5>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film G1.
<Example 6>
A laminate was produced in the same manner as in Example 1 except that one of the two resin films A1 was changed to the resin film B1.
<Example 7>
A laminate was produced in the same manner as in Example 1 except that one of the two resin films A1 was changed to the resin film C1.
<Example 8>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film A2.

<Comparative Example 1>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film H1.
<Comparative example 2>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film I1.
<Comparative Example 3>
A laminate was produced in the same manner as in Example 1 except that one of the two resin films A1 was changed to the resin film I1.
<Comparative example 4>
A laminate was produced in the same manner as in Example 2 except that one of the two resin films B1 was changed to the resin film I1.
<Comparative Example 5>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film A3.
<Comparative Example 6>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film A4.
<Comparative Example 7>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film E1.
<Comparative Example 8>
A laminate was produced in the same manner as in Example 1 except that both of the two resin films A1 were changed to the resin film F1.

DESCRIPTION OF SYMBOLS 1 ... Glass substrate, 2, 2x, 2y ... Conductive layer 3, 3a, 3b ... Base material (transparent film), 4a, 4b ... Uneven surface shape, 5 ... Printed layer, 7, 17 ... Adhesive layer, 11 ... Liquid crystal display, 12 ... base material (polarizing plate), 21, 22 ... capacitive touch panel, 31 ... adhesive layer, 100 ... anti-Newton ring laminate, 110 ... first layer, 111 ... base material, 112 ... unevenness 120 ... second layer, 121 ... base material, 122 ... uneven surface shape, 200, 201 ... display device with a capacitive touch panel using the anti-Newton ring laminate of the present invention, 300 ... conventional Display device with capacitive touch panel

Claims (7)

1. A first layer having an uneven surface shape on at least one surface, and a second layer having an uneven surface shape on at least one surface;
   The thickness of the uneven surface shape of the first layer and the uneven surface shape of the second layer is 1 to 6 μm, the surface roughness is greater than 10 nm and less than 60 nm,
   A laminate in which the surface shape of the unevenness of the first layer and the surface shape of the unevenness of the second layer are opposed to each other and the surface shape of the unevenness is in contact with each other.
2. The laminate according to claim 1, wherein the first layer and / or the second layer contains inorganic or organic fine particles having a particle diameter of 20 to 250 nm.
3. The uneven surface of the first layer and / or the uneven surface of the second layer are formed with unevenness by phase separation of a resin composition containing at least two kinds of components. Laminated body.
4. One of the uneven surface of the first layer and the uneven surface of the second layer is an uneven resin layer containing inorganic or organic fine particles having a particle diameter of 20 to 250 nm, and the other contains at least two types of components. The laminate according to any one of claims 1 to 3, wherein the resin composition to be formed is an uneven resin layer formed by phase separation.
5. The laminate according to any one of claims 1 to 4, wherein the first layer and the second layer have a haze greater than 0.6 and less than 7.0.
6. A display device in which the laminate according to any one of claims 1 to 5 is incorporated.
7. An optical film for incorporation in a display device having a touch panel function,
   The optical film has an uneven surface shape on at least one surface, and the surface roughness of the surface having the uneven surface shape is larger than 10 nm and smaller than 60 nm,
   At least two or more optical films are used in the same display device, and are arranged so that the surface shapes of the projections and recesses are in contact with each other.

Images