KR101627915B1 - Optical layered body with touch panel, polarizer, image display device and method for suppressing newton's rings generation - Google Patents

Abstract

Provided is an optical laminated body provided with a touch panel capable of sufficiently suppressing the occurrence of Newton rings and obtaining a high quality display image. A touch panel in which a hard coat layer and a low refractive index layer (A) are laminated in this order on one surface of a light-transmitting substrate, and a touch panel having a low refractive index layer (B) Wherein the optical film and the touch panel are opposed to each other such that the low refractive index layer (A) and the low refractive index layer (B) face each other with the gap therebetween, and the low refractive index layer (A) of the low refractive index layer (B) and the surface (B) of the low refractive index layer (B) on the low refractive index layer (A) The surface Y of the surface B has a reflection Y value of 0.1% or more and less than 1.5% and the ten points average roughness Rz of the surface A and the surface B are 20 to 90 nm and the average inclination angle? 5 to 20 [deg.].

Description

Technical Field [0001] The present invention relates to an optical laminate, a polarizing plate, an image display, and a method for suppressing the occurrence of Newton's rings,

The present invention relates to an optical laminate having a touch panel, a polarizing plate, an image display, and a method of suppressing the occurrence of Newton rings.

2. Description of the Related Art It is known that a touch panel is provided on a surface of a liquid crystal display panel or the like so that a user can touch information with a finger or a pen to input information.

However, in the liquid crystal display panel provided with such a touch panel, the touch panel and the liquid crystal display panel are disposed with a slight gap therebetween for the following reason.

That is, since the manufacturing conditions are different between the touch panel and the liquid crystal display panel, it is difficult or impossible to completely form the touch panel and the liquid crystal display panel so as to completely eliminate the gap. In addition, since the touch panel and the liquid crystal display panel are manufactured separately and then the touch panel is mounted on the liquid crystal display panel, the final product can be manufactured. Therefore, .

However, if there is a gap between the touch panel and the liquid crystal display panel, the touch panel is pressed and bent by a pen, a finger or the like from the viewer side, and Newton rings are generated when the touch panel is brought into contact with the liquid crystal display panel. That is, the periphery of the pointing jig such as the pen or the finger being pressed is so wide as to be comparable to the wavelength of the light, and the light reflected at the interface at the gap side of the touch panel, There is a problem that Newton rings are generated due to the interference of light reflected from the screen and the visibility of the screen is lowered.

For example, in Patent Document 1, a resin material is filled in a gap between a touch panel and a liquid crystal display panel to form a resin layer, thereby forming a resin layer on the interface between the touch panel and the liquid crystal display panel It is proposed to eliminate the reflection of light.

However, manufacturing the final product by filling the resin material can not replace only the touch panel even if a problem is found in the touch panel after manufacturing the final product. In addition, it is difficult to completely fill the gap between the touch panel and the liquid crystal display panel with the resin material, and when the bubble is contained, it is a cause of defects in the display image.

For example, in Patent Document 2, it is proposed to form concave and convex portions on the surface of the gap side between the touch panel and the liquid crystal display panel to reduce the reflectance of external light.

However, although Patent Document 2 discloses that the reflectance can be reduced by forming unevenness, its value is about 3.0%, and the occurrence of Newton rings can not be sufficiently suppressed by such reflectivity. In addition, in Reference 2, the shape of the unevenness is not studied at all.

Japanese Patent Application Laid-Open No. 2004-077887 Japanese Patent Application Laid-Open No. 2002-189565

SUMMARY OF THE INVENTION The present invention provides an optical laminate having a touch panel capable of sufficiently suppressing the occurrence of Newton rings and obtaining a high quality display image in view of the above situation, An image display apparatus, and a method for suppressing the occurrence of Newton rings.

The present invention is characterized in that an optical film in which a hard coat layer and a low refractive index layer (A) are laminated in this order on one side of a light-transmitting substrate and a touch panel having a low refractive index layer (B) Wherein the optical film and the touch panel are opposed to each other so that the low refractive index layer (A) and the low refractive index layer (B) face each other with the gap therebetween, and the optical film The surface A of the refractive index layer A on the side of the low refractive index layer B and the surface B of the low refractive index layer B on the side of the low refractive index layer A are uneven, (A) and the surface (B) have a reflection Y value of 0.1% or more and less than 1.5%, and the surface irregularities of the surface A and the surface B have a 10-point average roughness Rz of 20 to 90 nm, (DELTA a) is 5 to 20 DEG. The optical laminate includes the touch panel.

In the optical laminate having the touch panel of the present invention, it is preferable that the low refractive index layer (A) and the low refractive index layer (B) include hollow fine silica particles and a fluorine atom-containing resin as a binder resin.

The low refractive index layer (A) and the low refractive index layer (B) preferably have a hollow silica fine particle content of 80 to 200 parts by mass based on 100 parts by mass of the solid content of the binder resin.

Further, in the optical laminate having the touch panel of the present invention, it is preferable that the low refractive index layer (A) and the low refractive index layer (B) further contain fine solid silica fine particles having an average particle diameter of 80 to 300 nm .

The present invention is also a polarizing plate comprising a polarizing element, wherein the polarizing element is provided with an optical laminate having the above-described touch panel on the surface of the polarizing element.

The present invention is also an image display device comprising the above-described optical laminate provided with the touch panel or the above-mentioned polarizing plate.

The present invention is also characterized in that an optical film in which a hard coat layer and a low refractive index layer (A) are laminated in this order on one side of a light-transmitting substrate and a touch panel having a low refractive index layer (B) Wherein the optical film and the touch panel are bonded to each other with a gap between the low refractive index layer (A) and the low refractive index layer (B) And the surface A of the low refractive index layer B on the side of the low refractive index layer B and the surface A of the low refractive index layer B on the side of the low refractive index layer A B and the surface A and the surface B have a reflection Y value of 0.1% or more and less than 1.5% and the irregularities of the surface A and the surface B have a 10-point average roughness Rz) of 20 to 90 nm and an average inclination angle (? A) of 5 to 20 DEG .

In the present specification, the term " resin " is a concept including monomers, oligomers, and the like unless otherwise specified.

Hereinafter, the present invention will be described in detail.

As a result of intensive studies, the present inventors have found that, in an optical laminate comprising a touch panel in which a low refractive index layer of a touch panel and a low refractive index layer of an optical film are arranged so as to face each other, It is possible to suppress the occurrence of Newton's ring even if a gap is formed between the touch panel and the optical film by controlling the shape of the concavities and convexities so as to obtain a good display image and to complete the present invention It came to the following.

The optical laminate including the touch panel of the present invention having the above-described structure is completed based on the following findings.

That is, the occurrence of Newton ring can not be prevented in principle due to the structure of the touch panel system. Therefore, it is necessary to make it difficult to detect the Newton ring that occurs.

In order to make it difficult to detect Newton's ring, the intensity of reflected light itself is reduced by reducing all intensity values of the Newton ring, that is, by making all the two opposing interfaces in the touch panel system anti-reflection layer in order to lower the dark line .

In addition, the contrast line is changed from a circle to a complex line, and a simple geometric line is used to make it difficult to detect.

In addition, since the sensitivity to be detected is deteriorated, the thickness of the dark (female) line is made uneven, that is, the surface irregularities are formed at the two opposing interfaces in the touch panel system. Do not make concentric circles where the integer multiples and half wavelengths are displaced.

In addition, since the sensitivity to be detected is deteriorated when the change of the light and shade is gentle, the contrast of the adjacent light and shade is lowered, that is, the concave and convex are formed between the Newton rings.

By using the method described above, it is possible to make it difficult to detect the Newton ring to be generated.

Here, an optical laminate having a low refractive index layer disposed on the outermost surface of a liquid crystal display or the like is conventionally known. The low refractive index layer of the optical laminate used on the outermost surface of such a liquid crystal display device or the like has a concavo-convex shape equivalent to the surface of the low refractive index layer in the optical laminate provided with the touch panel of the present invention If it is formed, the scratch resistance is lowered. Therefore, the surface of the low refractive index layer in the conventional optical laminate was required to be as flat as possible. Therefore, the low refractive index layer in the optical laminate disposed on the outermost surface of a conventionally known liquid crystal display device or the like can not be used as the low refractive index layer of the optical film of the present invention.

In the optical laminate provided with the touch panel of the present invention, the low refractive index layer of the optical film does not become the outermost surface because of the presence of the touch panel as described above. Therefore, it is sufficient that the low refractive index layer of the optical film has sufficient scratch resistance to such an extent that scratches do not occur in the manufacturing process, and that the specific concavo-convex shape described above is formed on the surface of the low refractive index layer, . Specifically, in the optical laminate provided with the touch panel of the present invention, a steel wool ("BONSTAR # 0000 (trade name)" manufactured by Nippon Steel Mill Co., Ltd.) was used for the low refractive index layer of the optical film, It is preferable that the abrasion resistance is such that scratches can not be visually confirmed after 10 rounds of rubbing at 100 g / cm < 2 >.

1 is a cross-sectional view schematically showing an example of an optical laminate having a touch panel according to the present invention.

As shown in Fig. 1, an optical laminate 10 provided with a touch panel of the present invention has an optical film 11 and a touch panel 15 disposed opposite to the optical film 11. As shown in Fig.

The optical film 11 has a structure in which a hard coat layer 13 and a low refractive index layer A are stacked in this order on one side of a light transmitting base material 12, And a low refractive index layer (B) 16 on the surface.

The optical film 11 and the touch panel 15 are opposed to each other such that the low refractive index layer (A) 14 and the low refractive index layer (B) 16 face each other with the gap therebetween.

Although not shown, in the optical laminate 10 provided with the touch panel of the present invention, the surface A of the low refractive index layer (A) 14 on the side of the low refractive index layer (B) 16 and the refractive index The surface (B) on the side of the low refractive index layer (A) 14 of the layer (B) 16 is provided with projections and depressions.

The unevenness of the surface (A) and the surface (B) of the surface (hereafter also collectively referred to as " surface ") has a 10-point average roughness Rz of 20 to 90 nm and an average inclination angle? to be. Since the concave-convex shape satisfying such specific parameters is formed on the surface, the optical laminate provided with the touch panel of the present invention can extremely suppress the occurrence of Newton rings.

Further, in the prior art, a light-shielding film having an antiglare layer having a concavo-convex shape on its surface is known for the purpose of imparting a light-shielding property, but the optical laminate of the present invention is different from such a conventional light-

That is, in the optical laminate of the present invention, a specific concavo-convex shape is formed on the surface A and the surface B to suppress the occurrence of Newton's ring, and the surface (A) and the surface (B) The concave-convex shape has a very small value of Rz as compared with the concavo-convex shape formed on the surface of the conventional anti-glare film. Therefore, in the optical laminate of the present invention in which such concavo-convex shape is formed, the same antiglare property as that of the conventional retardation film can not be obtained. On the other hand, according to the present invention, generation of Newton rings can be suppressed to a very high degree.

When the ten-point average roughness (Rz) of the irregularities of the surface is less than 20 nm, the surface unevenness is small and the generation of Newton rings can not be suppressed sufficiently. Basically, the larger Rz is, However, the scratch resistance tends to deteriorate as soon as Rz becomes a certain size. Particularly, when the Rz exceeds 90 nm, the scratch resistance necessary for the touch panel can not be maintained. In addition, This is a cause of scratches in the manufacturing process of the optical laminate provided with the touch panel. The preferable lower limit of the ten-point average roughness (Rz) is 35 nm, and the preferable upper limit is 70 nm.

In addition, if the average unevenness of the unevenness (? A) of the surface is less than 5, the unevenness of the surface becomes gentle and the occurrence of Newton ring can not be sufficiently suppressed. Basically, the larger the average inclination angle? A, the better the suppression of the occurrence of Newton rings, but the scratch resistance tends to deteriorate as soon as the average inclination angle? Exceeds 20 deg., It is not possible to maintain the necessary scratch resistance required for the touch panel, and also causes scratches in the manufacturing process of the optical laminate provided with the touch panel of the present invention. The preferable lower limit of the average inclination angle [Delta] a is 7 [deg.], More preferably the lower limit is 10 [deg.], And the preferable upper limit is 15 [deg.].

In the present specification, the 10-point average roughness (Rz) and the average tilt angle (? A) were measured using an SPIWin (AFM) L-trace manufactured by SII Nanotechnology Co., Analysis mode in SPIWin compatible mode. The SPIWin compatibility mode is an analysis format extended in three dimensions based on the 1982 edition JIS standard (JIS B0601: 1982).

In the optical laminate provided with the touch panel of the present invention, the reflection (Y) value of the surface (A) and the surface (B) is 0.1% or more and less than 1.5%. If it is less than 0.1%, the scratch resistance of the surface (A) and the surface (B) deteriorates to cause scratches in the manufacturing process. If the surface (A) The occurrence of Newton rings can not be sufficiently suppressed. The preferable lower limit of the reflection Y value is 0.3%, and the preferable upper limit is 1.2%.

The reflection Y value is measured by a MPC3100 spectrophotometer manufactured by Shimadzu Corporation under the condition that a 5-degree constant reflectance is measured in a wavelength range from 380 to 780 nm, and thereafter software (MPC3100 (Built-in).

Basically, the smaller the reflection Y value, the better the suppression of the occurrence of Newton rings. However, the effect of inhibiting the occurrence of Newton rings is that the reflection Y value and the average inclination angle? . Therefore, even if the reflection Y value is small, for example, if the average inclination angle? A is a small value, the effect of suppressing the occurrence of Newton's ring becomes small. On the contrary, If the average inclination angle? A is large, the effect of inhibiting the occurrence of Newton rings becomes large.

In the optical laminate having the touch panel of the present invention, the low refractive index layer (A) and the low refractive index layer (B) (hereinafter, both of them are collectively referred to as a low refractive index layer) It is preferable to include a fluorine atom-containing resin.

The low refractive index layer is a layer having a refractive index lower than the refractive index of a component other than the low refractive index layer such as a light transmitting substrate constituting the optical laminate having the touch panel of the present invention and exhibiting excellent anti- to be.

The hollow silica fine particles are a material for lowering the refractive index of the low refractive index layer. The low refractive index layer including hollow silica fine particles includes a fluorine atom-containing resin as a binder resin, It is possible to appropriately form irregularities on the surface that satisfy the above-mentioned parameters. This is for the following reasons.

That is, the hollow silica fine particles and the low refractive index layer containing the fluorine atom-containing resin as the binder resin are formed by forming a coating film using the composition for a low refractive index layer containing them and drying and curing the coating film.

When the hollow silica fine particles are uniformly dispersed in the composition for the low refractive index layer, it is difficult to form the concavo-convex shape capable of suppressing the occurrence of the Newton ring described above on the surface of the low refractive index layer to be formed. However, since the fluorine atom-containing resin is a hydrophobic resin, the hollow silica fine particles and the fluorine atom-containing resin are compatible with each other in the composition for the low refractive index layer, while the surface of the hollow fine silica particles is hydrophilic The hollow silica fine particles in the coating film are largely unevenly distributed in the vicinity of the interface on the air layer side (the surface side in the case of the low refractive index layer). When the coating film in the state where the hollow silica fine particles are localized is dried and cured to form the low refractive index layer, the hollow silica fine particles are present in the vicinity of the surface of the low refractive index layer, Can be suitably formed.

Since the irregularities due to the hollow silica fine particles can be appropriately formed in this manner, the irregularities formed on the surface of the low refractive index layer can be controlled within the range of the parameters described above.

The hollow silica fine particles serve to reduce the refractive index of the low refractive index layer while forming a concave-convex shape satisfying the above-described parameters on the surface of the low refractive index layer. In the present specification, the term " hollow-shaped silica fine particles " means silica fine particles having a structure filled with a gas and having a refractive index lowered in inverse proportion to the occupancy rate of the gas relative to the original refractive index of the fine silica particles.

Specific examples of the hollow silica fine particles are not particularly limited and, for example, silica fine particles produced by using the technique disclosed in Japanese Patent Application Laid-Open No. 2001-233611 are preferably used. Since hollow silica fine particles are easy to produce and have high hardness themselves, when the low refractive index layer is formed by mixing with a binder resin described later, it is possible to improve the layer strength and adjust the refractive index so as to be low It becomes.

The average particle diameter of the hollow fine silica particles is preferably 5 to 300 nm. When the average particle diameter of the hollow silica fine particles is within this range, excellent transparency can be imparted to the low refractive index layer. A more preferable lower limit is 8 nm, a more preferable upper limit is 100 nm, a still more preferable lower limit is 10 nm, and a still more preferable upper limit is 80 nm.

The average particle diameter of the hollow silica fine particles means a value measured by a dynamic light scattering method in the case of the hollow fine silica particles alone. On the other hand, the average particle diameter of the hollow silica fine particles in the low refractive index layer can be measured by observing the cross section of the low refractive index layer by STEM or the like, selecting 30 hollow fine silica fine particles, measuring the particle diameter of the cross- Is a value calculated as an average value.

It is preferable that the hollow fine silica particles have a shell thickness of 5 to 20 nm. If it is less than 5 nm, it is difficult to produce, and the strength of the hollow silica fine particles becomes insufficient, which may make it easy to crumble. When it exceeds 20 nm, the low refractive index layer may not be sufficiently low in refractive index in some cases. A more preferable lower limit of the thickness of the shell is 7 nm, and a more preferable upper limit is 15 nm. The shell refers to an outer angle formed by silica except for the gas existing in the central portion of the hollow silica fine particles, and the thickness of the shell can be measured by observation of a cross section microscope of the low refractive index layer.

The content of the hollow silica fine particles in the low refractive index layer is preferably 80 to 200 parts by mass with respect to 100 parts by mass of the solid content of the binder resin described later. If the amount is less than 80 parts by mass, the low refractive index layer can not be made sufficiently low in refractive index because the content of hollow silica fine particles is small, and irregularities satisfying the above parameters can not be formed on the surface of the low refractive index layer , Even if the hollow silica fine particles are contained in an amount exceeding 200 parts by mass, the refractive index of the low refractive index layer can not be further lowered, and the strength of the low refractive index layer may be insufficient. A more preferred lower limit is 100 parts by mass, and a more preferable upper limit is 180 parts by mass.

Further, in the optical laminate having the touch panel of the present invention, it is preferable that the low refractive index layer further contains fine silica fine particles in addition to the hollow fine silica particles.

The solid fine silica particles are a material for forming minute concavities and convexities in the low refractive index layer, and the hardness of the low refractive index layer can be increased by containing the solid fine silica particles. In the present specification, the term " solid silica fine particles " means a structure in which no gas is filled in the inside, unlike the hollow silica fine particles described above, and means silica fine particles having the refractive index inherent to the fine silica particles.

The solid fine silica particles preferably have an average particle diameter of 80 to 300 nm. If it is less than 80 nm, irregularities can not be appropriately formed and the occurrence of Newton rings can not be sufficiently suppressed. On the other hand, if the thickness exceeds 300 nm, excessive irregularities are formed, And the reflection Y value is increased to increase the amount of reflected light at the interface, so that the occurrence of Newton ring can not be sufficiently suppressed.

Here, the mean particle diameter of the fine solid silica fine particles means a value measured in the same manner as the above-mentioned fine hollow silica fine particles.

The content of the solid fine silica particles in the low refractive index layer is preferably 1 to 10 parts by mass based on 100 parts by mass of the solid content of the binder resin described later. If it is less than 1 part by mass, unevenness can not be properly formed, and the occurrence of Newton rings may not be sufficiently suppressed. When the amount exceeds 10 parts by mass, excessive irregularities may be formed to increase the haze, And the reflection Y value is increased to increase the amount of reflected light at the interface, so that the occurrence of Newton ring can not be sufficiently suppressed.

The fine solid fine silica particles preferably have a functional group having reactivity with a fluorine atom-containing resin as a binder resin, for example, a functional group having an ethylenically unsaturated bond, etc., on the surface thereof. By having the reactive functional group on the surface, the hardness of the low refractive index layer is excellent.

In the optical laminate having the touch panel of the present invention, it is preferable that the low refractive index layer contains a fluorine atom-containing resin as a binder resin.

The fluorine atom-containing resin is preferably a polymerizable compound containing at least a fluorine atom in a molecule or a polymer thereof.

The polymerizable compound is not particularly limited, but preferably has a curing-reactive group such as a functional group which is cured by ionizing radiation or a polar group which is thermally cured. Further, a compound capable of simultaneously combining these reactive groups may also be used. With respect to the polymerizable compound, the polymer does not have any reactive group as described above.

As the polymerizable compound having a functional group which is cured by the above ionizing radiation, a fluorine-containing monomer having an ethylenic unsaturated bond can be widely used. More specifically, fluoroolefins (for example, fluoroethylene, vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, perfluorobutadiene, perfluoro-2,2-dimethyl- 3-dioxol and the like). (Meth) acryloyloxy group include 2,2,2-trifluoroethyl (meth) acrylate, 2,2,3,3,3-pentafluoropropyl (meth) acrylate, 2- (Perfluorohexyl) ethyl (meth) acrylate, 2- (perfluorohexyl) ethyl (meth) acrylate, 2- ) (Meth) acrylate compounds having fluorine atoms in the molecule, such as ethyl (meth) acrylate, methyl? -Trifluoromethacrylate and ethyl? -Trifluoromethacrylate; (Meth) acrylic acid having at least three fluorine atoms, a fluoroalkyl group having 1 to 14 carbon atoms, a fluorocycloalkyl group or a fluoroalkylene group having at least two fluorine atoms and at least two fluorine-containing (meth) acryloyloxy groups Ester compounds and the like.

In the present specification, "(meth) acrylate" means acrylate or methacrylate.

Examples of the thermosetting polar group include hydrogen bond forming groups such as a hydroxyl group, a carboxyl group, an amino group, and an epoxy group.

Examples of the polymerizable compound having a thermosetting polar group include a 4-fluoroethylene-perfluoroalkyl vinyl ether copolymer; Fluoroethylene-hydrocarbon-based vinyl ether copolymers; Fluorine-modified products of various resins such as epoxy, polyurethane, cellulose, phenol, and polyimide.

Examples of the polymerizable compound having a polar group capable of being thermally cured by a functional group cured by the ionizing radiation include acrylic or methacrylic acid moieties and fully fluorinated alkyl, alkenyl, aryl esters, fully or partially fluorinated vinyl ethers, Partially-fluorinated vinyl esters, fully or partially fluorinated vinyl ketones, and the like.

The binder resin may be a fluorine atom-containing resin, for example, a monomer or a monomer mixture containing at least one fluorine-containing (meth) acrylate compound of a polymerizable compound having a functional group which is cured by the ionizing radiation polymer; (Meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl Copolymers of (meth) acrylate compounds that do not contain fluorine atoms in the molecule such as acrylate; Fluoroethylene, vinylidene fluoride, trifluoroethylene, chlorotrifluoroethylene, 3,3,3-trifluoropropylene, 1,1,2-trichloro-3,3,3-trifluoropropylene, A homopolymer or a copolymer of a fluorine-containing monomer such as hexafluoropropylene, or the like may be contained.

In addition, these copolymers may contain a silicon-containing vinylidene fluoride copolymer containing a silicon component. Examples of the silicone component in this case include (poly) dimethylsiloxane, (poly) diethylsiloxane, (poly) diphenylsiloxane, (poly) methylphenylsiloxane, alkyl modified (poly) dimethylsiloxane, Silicon-containing silicon, silane-containing silicon, alkoxy group-containing silicon, phenol group-containing silicon, meta-silicon-containing silicon, meta-silicon-containing silicon, Acryl modified silicone, acryl modified silicone, acryl modified silicone, carboxy modified silicone, carbinol modified silicone, epoxy modified silicone, mercapto modified silicone, fluorine modified silicone, polyether modified silicone and the like. Among them, those having a dimethylsiloxane structure are preferable.

Further, the binder resin is preferably a fluorine-containing resin having at least one isocyanato group in its molecule and a functional group capable of reacting with an isocyanato group such as an amino group, a hydroxyl group or a carboxyl group, A compound obtained by reacting a compound having at least one group; A compound obtained by reacting a fluorine-containing polyol such as a fluorine-containing polyether polyol, a fluorine-containing alkylpolyol, a fluorine-containing polyesterpolyol and a fluorine-containing? -Caprolactone-modified polyol with a compound having an isocyanato group .

The content of the fluorine atom-containing resin in the binder resin is preferably 90% by mass or less based on the total solid content of the binder resin. If it exceeds 90% by mass, when the low refractive index layer is formed, the hardness of the layer strength may not be maintained sufficiently. A more preferable upper limit of the content of the fluorine atom-containing resin is 80% by mass.

The refractive index of the fluorine atom-containing resin itself is preferably 1.37 to 1.44. If it is less than 1.37, the ratio of fluorine atoms becomes high, so that it is difficult to dissolve in a general solvent and dissolves in only a fluorine atom-containing solvent. In addition, the solubility of the hollow silica fine particles and the monomer components of the above-mentioned (meth) acrylic resin becomes excessively poor, and the composition for a low refractive index layer described later may become gelled or the coating film itself formed may be whitened. On the other hand, when it exceeds 1.44, the refractive index of the binder resin becomes close to that described above, and the effect of lowering the refractive index may be reduced.

Further, when the binder resin is only the fluorine atom-containing binder, the hardness of the low refractive index layer is deteriorated, so that the above-mentioned (meth) acrylic resin becomes essential.

The binder resin may contain various kinds of additives and solvents such as a curing agent for curing other resin components and reactive groups together with the above-mentioned fluorine atom-containing resin and the like, a curing agent for improving the application workability, It can be used properly.

As the other resin component, for example, an ultraviolet curable resin may be used. In the present invention, a (meth) acrylic resin is suitably used. In the present specification, "(meth) acryl" means acryl or methacryl.

Examples of the (meth) acrylic resin include polymers and copolymers of (meth) acrylic monomers. The (meth) acrylic monomers are not particularly limited, and examples thereof include pentaerythritol tri (meth) (Meth) acrylate, dipentaerythritol penta (meth) acrylate, trimethylol propane tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, pentaerythritol tetra , Ditrimethylolpropane tetra (meth) acrylate, isocyanuric acid EO-modified tri (meth) acrylate, and the like.

These (meth) acrylate monomers may be ones which modify a part of the molecular skeleton or may be modified with ethylene oxide, propylene oxide, caprolactone, isocyanuric acid, alkyl, cyclic alkyl, aromatic, bisphenol and the like Can be used.

These (meth) acrylic monomers may be used alone, or two or more of them may be used in combination. These (meth) acrylic monomers satisfy the refractive index range as described later, and are excellent in curing reactivity, and can improve the hardness of the obtained low refractive index layer.

The (meth) acrylic monomer preferably has a refractive index of 1.47 to 1.53. It is practically impossible to reduce the refractive index to less than 1.47. When the refractive index exceeds 1.53, a low refractive index layer with a sufficiently low refractive index may not be obtained.

The (meth) acrylic monomer preferably has a weight average molecular weight of 250 to 1,000. If it is less than 250, since the number of functional groups is reduced, the hardness of the obtained low refractive index layer may be lowered. On the other hand, when the number-average molecular weight is more than 1,000, the functional group equivalent (number of functional groups / molecular weight) is generally small, so that the crosslinking density is low and the hardness of the low refractive index layer is insufficient.

The weight average molecular weight of the (meth) acrylic monomer can be determined by polystyrene conversion by gel permeation chromatography (GPC). As the solvent for the GPC moving phase, tetrahydrofuran or chloroform may be used. As the measurement column, a commercially available column of a column for tetrahydrofuran or a column for chloroform may be used in combination. Examples of commercially available columns include Shodex GPC KF-801 and GPC-KF800D (all trade names, manufactured by Showa Denko K.K.). For the detector, RI (differential refractive index) detector and UV detector may be used. The weight average molecular weight can be appropriately determined by a GPC system such as Shodex GPC-101 (manufactured by Showa Denko K.K.) using such a solvent, a column and a detector.

The haze value of the low refractive index layer is preferably 1% or less. If it exceeds 1%, the optical transmittance of the optical laminate provided with the touch panel of the present invention may be deteriorated or the resolution may be lowered, which may cause deterioration of the display quality of the image display device. More preferably, it is 0.5% or less. In the present specification, the haze value is a value obtained in accordance with JIS K7136.

It is preferable that the low refractive index layer is free from scratches in an abrasion resistance test in which a friction load is 100 g / cm < 2 > using 10 steel wool ("BONSTAR # 0000 (trade name)" manufactured by Nippon Steel Mill Co., Ltd.) Do.

The low refractive index layer is formed using a composition for a low refractive index layer formed by adding the hollow silica fine particles and a binder resin.

The composition for the low refractive index layer may further contain a solvent.

The solvent is not particularly limited, and examples thereof include alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, s-butanol, t-butanol, benzyl alcohol and PGME; Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, heptanone, diisobutyl ketone and diethyl ketone; Esters such as methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl formate, ethyl formate, propyl formate, butyl formate and PGMEA; Aliphatic hydrocarbons such as hexane and cyclohexane; Halogenated hydrocarbons such as methylene chloride, chloroform and carbon tetrachloride; Aromatic hydrocarbons such as benzene, toluene and xylene; Amides such as dimethylformamide, dimethylacetamide and n-methylpyrrolidone; Ethers such as diethyl ether, dioxane and tetrahydrofuran; And ether alcohol such as 1-methoxy-2-propanol. Among them, methyl isobutyl ketone, methyl ethyl ketone, isopropyl alcohol (IPA), n-butanol, s-butanol, t-butanol, PGME and PGMEA are preferable.

Further, the composition for the low refractive index layer may contain other components as necessary.

Examples of the other components include a photopolymerization initiator, a leveling agent, a crosslinking agent, a curing agent, a polymerization promoter, a viscosity adjusting agent, an antistatic agent, and a resin other than those described above.

As the photopolymerization initiator, when the composition for a low refractive index layer contains a resin system having a radically polymerizable unsaturated group, the photopolymerization initiator is preferably selected from the group consisting of acetophenones (for example, 1-hydroxy-cyclohexane commercially available under the trade name Irgacure 184 Hexyl-phenyl-ketone), benzophenones, thioxanthones, benzoin, benzoin methyl ether, etc. These may be used alone or in combination of two or more.

When the composition for a low refractive index layer contains a resin system having a cationic polymerizable functional group, examples of the photopolymerization initiator include aromatic diazonium salts, aromatic sulfonium salts, aromatic iodonium salts, metallocene compounds, benzoin sulfonic acid Ester, etc. These may be used alone, or two or more of them may be used in combination. More specifically, Irgacure 184, Irgacure 907, Irgacure 369, Irgacure 379, Irgacure 819, Irgacure 127, Irgacure 500, Irgacure 754, and Irgacure 754 manufactured by Ciba Specialty Chemicals, Irgacure 250, Irgacure 1800, Irgacure 1870, Irgacure OXE01, DAROCUR TPO, DAROCUR1173; Speedcure MB, SpeedcurePBZ, SpeedcureITX, SpeedcureCTX, SpeedcureEDB, Esacure ONE, Esacure KIP150, Esacure KTO46; KAYACURE DETX-S, KAYACURE CTX, KAYACURE BMS, and KAYACURE DMBI from Nippon Kayaku Co., Ltd. Among these, Irgacure 369, Irgacure 127, Irgacure 907, Esacure ONE, SpeedcureMBB, SpeedcurePBZ, and KAYACURE DETX-S are preferable.

The amount of the photopolymerization initiator to be added is preferably 0.1 to 10 parts by mass based on 100 parts by mass of the solid content of the binder resin.

As the leveling agent, crosslinking agent, curing agent, polymerization accelerator, viscosity adjusting agent, antistatic agent and other resins, known ones can be used.

The viscosity of the composition for a low refractive index layer is preferably 0.5 to 5 mPa ((25 캜) at which a desired coating property can be obtained. When the viscosity is in the above range, it is possible to realize an excellent antireflection performance of a visible ray, to form a uniform thin film having no coating irregularity, and to form a low refractive index layer having particularly excellent adhesion. More preferably 0.7 to 3 mPa 占 퐏 (25 占 폚).

The layer thickness (nm) d _A of the low refractive index layer is represented by the following formula (1)

(Wherein,

n _A represents the refractive index of the low refractive index layer,

m represents a positive odd number, preferably 1,

lambda is a wavelength, preferably a value in the range of 480 to 580 nm)

Is satisfied.

Further, in the present invention, the low refractive index layer has the following formula (2)

Is preferable in terms of low reflectance.

The method for producing the composition for a low refractive index layer is not particularly limited and can be obtained, for example, by mixing components such as the above hollow fine silica particles, a binder resin, a solvent to be added as required, and a photopolymerization initiator. For mixing, known methods such as paint shaker or bead mill can be used.

The low refractive index layer is formed by coating a coating film formed by applying the composition for a low refractive index layer on a hard coat layer or a glass substrate of a touch panel to be described later as needed and irradiating the coated film by irradiation with ionizing radiation and / And then curing it.

The method for applying the composition for a low refractive index layer is not particularly limited and examples thereof include spin coating, dipping, spraying, die coating, bar coating, roll coating, meniscus coating, flexographic printing , A screen printing method, a feed coater method, and the like.

In the optical laminate having the touch panel of the present invention, the optical film has a hard coat layer and the above-described low refractive index layer (low refractive index layer (A)) laminated in this order on one surface of the light- have.

The light-transmitting substrate preferably has smoothness and heat resistance, and is excellent in mechanical strength. Specific examples of the material forming the light-transmitting substrate include, for example, polyester (polyethylene terephthalate, polyethylene naphthalate), cellulose triacetate, cellulose diacetate, cellulose acetate butyrate, polyamide, polyimide, polyether sulfone, , Thermoplastic resins such as polypropylene, polymethylpentene, polyvinyl chloride, polyvinyl acetal, polyether ketone, polymethyl methacrylate, polycarbonate, or polyurethane. Preferable examples include polyester (polyethylene terephthalate, polyethylene naphthalate) and cellulose triacetate.

It is preferable to use the thermoplastic resin as the film-shaped body having a high flexibility. However, depending on the use form requiring curability, it is possible to use the thermoplastic resin plate, or the plate- May be used.

In addition, examples of the light-transmitting base material include an amorphous olefin polymer (COP) film having an alicyclic structure. This is a substrate in which a norbornene polymer, a monocyclic cycloolefin polymer, a cyclic conjugated diene polymer, a vinyl alicyclic hydrocarbon polymer and the like are used, and examples thereof include Zeonex and Zeonoa (norbornene resin (Cyclic olefin copolymer) manufactured by Mitsui Chemical Industry Co., Ltd., Topas (cyclic olefin copolymer) manufactured by Ticona Co., Ltd., Heiwa Co., Ltd., OZ-1000 series (alicyclic acrylic resin) manufactured by Tohto Kasei Co., Ltd., and the like.

Further, FV series (low refractive index, low light modulus film) manufactured by Asahi Kasei Chemicals Co., Ltd. is also preferable as an alternative substrate of triacetylcellulose.

The thickness of the light-transmitting base material is preferably 5 to 300 mu m, more preferably 20 mu m lower limit and 200 mu m upper limit. In the case where the light-transmitting base material is in the form of a plate, these thicknesses may be exceeded. In order to improve the adhesion, the light-transmitting substrate is subjected to a physical treatment such as a corona discharge treatment, an atmospheric pressure plasma treatment, an oxidation treatment, or the like by coating an anchor agent or a paint called a primer May be performed in advance. When the material of the light-transmitting base material is triacetylcellulose, chemical treatment such as alkali treatment (saponification treatment) may be performed in advance.

The hard coat layer means a hardness of not less than 2H in a pencil hardness test prescribed by JIS K5600-5-4 (1999). The hardness is more preferably 3H or more. The hard coat layer has a film thickness (at the time of curing) of 0.1 to 100 占 퐉, preferably 0.8 to 20 占 퐉.

The hard coat layer is not particularly limited, and examples thereof include those formed by a composition for a hard coat layer containing a resin and an optional component.

As the resin, those having transparency are suitably used, and specifically, an ionizing radiation curable resin, an ionizing radiation curable resin and a solvent drying type resin (a resin which is cured by ultraviolet rays or electron beams A resin which is only used to dry the solvent and which becomes a coating film), or a thermosetting resin, and preferably an ionizing radiation-curable resin.

Specific examples of the ionizing radiation curable resin include those having an acrylate-based functional group such as a polyester resin, a polyether resin, an acrylic resin, an epoxy resin, a urethane resin, an alkyd resin, a spiroacetal resin, a poly Oligomers or prepolymers of (meth) acrylates of polyfunctional compounds such as polybutadiene resins, polythiol polyene resins and polyhydric alcohols, reactive diluents and the like.

When the ionizing radiation curable resin is used as an ultraviolet curable resin, it is preferable to use a photopolymerization initiator.

Examples of the photopolymerization initiator include acetophenones, benzophenones, meihyl benzoyl benzoates,? -Amyl oxime esters, tetramethyl thiuram monosulfide, and thioxanthones.

Further, it is preferable to use a mixture of photosensitizer. Specific examples thereof include n-butylamine, triethylamine, poly-n-butylphosphine and the like.

As the solvent drying type resin to be mixed with the ionizing radiation curable resin, a thermoplastic resin is mainly used, and the thermoplastic resin is not particularly limited and conventionally known ones can be used.

By the addition of the above-mentioned solvent-drying type resin, coating film defects on the coated surface can be effectively prevented. According to a preferred aspect of the present invention, when the material of the light-transmitting substrate is a cellulose resin such as cellulose triacetate, preferred examples of the thermoplastic resin include cellulose resins such as nitrocellulose, acetylcellulose, cellulose acetate propionate , Ethylhydroxyethylcellulose, and the like.

Examples of the thermosetting resin include phenol resin, urea resin, diallyl phthalate resin, melamine resin, guanamine resin, unsaturated polyester resin, polyurethane resin, epoxy resin, aminoalkyd resin, melamine-urea co- Resins, polysiloxane resins, and the like.

When the thermosetting resin is used, a curing agent such as a crosslinking agent and a polymerization initiator, a polymerization accelerator, a solvent, a viscosity adjuster and the like may be further added, if necessary.

The hard coat layer may be formed by applying a composition for a hard coat layer prepared using each of the above-described materials to a coating film formed on the light-transmitting substrate, drying it if necessary, and curing the coating film by ionizing radiation or heating can do. The method for producing the composition for a hard coat layer and the method for forming a coating film may be the same as those for the low refractive index layer described above.

The above-mentioned hard coat layer may also contain a high hardness and low-k materials such as known antistatic agents, high refractive index agents, and colloidal silica.

The optical film having a structure in which the hard coat layer is formed between the light-transmitting substrate and the low refractive index layer (A) is further provided between the hard coat layer and the light-transmitting substrate or the low refractive index layer with a known antistatic agent and a binder Or a structure in which an antistatic layer containing a resin is formed.

The total light transmittance of the optical film is preferably 90% or more. If it is less than 90%, there is a fear that color reproducibility and visibility may be impaired when the optical laminate with the touch panel of the present invention is mounted on the display surface. The total light transmittance is more preferably 95% or more, and still more preferably 96% or more.

The haze of the optical film is preferably less than 1%, more preferably less than 0.5%.

The method for producing an optical film includes the steps of forming a hard coat layer by applying the composition for a hard coat layer on a light transmitting substrate and applying the composition for a low refractive index layer to the hard coat layer to form a low refractive index layer And a step of forming a resist pattern.

The method of forming the hard coat layer and the low refractive index layer is as described above.

The touch panel has the above-described low refractive index layer (low refractive index layer (B)) on one side.

The touch panel is not particularly limited. For example, two electrode films having a transparent conductive film such as ITO formed on the surface thereof are used, and the electrode films are opposed so that the transparent conductive film faces each other. And a structure in which the above-described low refractive index layer (B) is formed on the surface opposite to the transparent conductive film of the electrode film on the non-input side.

As the constituent member other than the low refractive index layer (B) of the touch panel, a similar member to that of a conventionally known touch panel used as an input device mounted on the screen of a display device such as a liquid crystal display panel can be used.

In the touch panel, a light-transmitting base material, a hard coat layer and a low-refractive-index layer (B) are provided on the surface of the non-input side electrode film opposite to the transparent conductive film with an adhesive layer interposed therebetween, Or may be laminated in this order. As the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer, it is preferable that an optical component such as a light-transmitting base material and a polarizing plate can be firmly adhered and that the pressure-sensitive adhesive does not foam even under the conditions of high temperature and high humidity. For example, Is used.

Such a touch panel may be any of a capacitive type, an optical type, an ultrasonic type, and a thin film resistor type.

The optical laminate provided with the touch panel of the present invention is disposed such that the low refractive index layer (A) and the low refractive index layer (B) face each other with the optical film and the touch panel interposed therebetween.

The gap formed between the optical film and the touch panel is not particularly limited and is appropriately adjusted to the same extent as, for example, the gap in a liquid crystal panel on which a conventionally known touch panel is mounted. A method of arranging the optical film and the touch panel to face each other is not particularly limited, and conventionally known methods can be used.

The optical laminate provided with the touch panel of the present invention can be a polarizing plate by forming the light-transmitting base side of the optical film on the surface of the polarizing element by lamination treatment or the like. A polarizing plate comprising such a polarizing element and having an optical laminate including the touch panel of the present invention on the surface of the polarizing element is also one of the present invention.

The polarizing element is not particularly limited and includes, for example, a stretched polyvinyl alcohol film, a polyvinyl formal film, a polyvinyl acetal film and an ethylene-vinyl acetate copolymerization system saponified film stained with iodine or the like.

In the lamination treatment of the optical laminate provided with the polarizing element and the touch panel of the present invention, it is preferable to saponify the light transmitting substrate (preferably, triacetyl cellulose film). By the saponification treatment, adhesiveness is improved and an antistatic effect can be obtained.

The present invention is also an image display apparatus comprising the optical laminate having the touch panel or the polarizing plate.

The image display device may be an image display device such as LCD, PDP, FED, ELD (organic EL, inorganic EL), CRT, tablet PC, touch panel, electronic paper and the like.

The LCD, which is a representative example of the above, comprises a transmissive display body and a light source device that irradiates the transmissive display body from the backside. When the image display device of the present invention is an LCD, the optical laminate having the touch panel of the present invention or the polarizing plate of the present invention is formed on the surface of the transmissive display.

When the present invention is a liquid crystal display device having an optical laminate provided with the touch panel, the light source of the light source device is irradiated from the lower side of the optical laminate. Further, a phase difference plate may be inserted between the liquid crystal display element and the polarizing plate. An adhesive layer may be formed between the respective layers of the liquid crystal display device, if necessary.

The PDP as the image display device has a structure in which a front glass substrate (an electrode is formed on the front surface) and a rear glass substrate (electrodes and minute grooves are formed on the surface of the front glass substrate, And forming red, green and blue phosphor layers in the grooves). When the image display apparatus of the present invention is a PDP, the optical laminate having the above-described touch panel may be provided on the surface of the surface glass substrate or a front surface plate (glass substrate or film substrate) thereof.

The image display device includes an ELD device for depositing zinc sulfide, a diamine material, and a light emitting material, which emit light when a voltage is applied, on a glass substrate and controlling the voltage applied to the substrate to perform display, Or an image display device such as a CRT that generates a visible image of the image. In this case, the optical laminate having the above-described touch panel is provided on the outermost surface of each display device or on the surface of the front surface plate.

In any case, the image display apparatus of the present invention can be used for display on a television, a computer, an electronic paper, a tablet PC, or the like. In particular, it can be suitably used on the surface of high-precision image display such as CRT, liquid crystal panel, PDP, ELD, and FED.

In the optical laminate provided with the touch panel of the present invention, since the specific concave-convex shape is formed on the surface of the opposed low refractive index layer of the optical film and the touch panel, generation of Newton ring can be sufficiently suppressed, Can be obtained.

Therefore, the optical laminate provided with the touch panel of the present invention can be used as a cathode ray tube (CRT), a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (ELD) FED), an electronic paper, a tablet PC, and the like.

1 is a cross-sectional view schematically showing an example of an optical laminate having a touch panel of the present invention.

The contents of the present invention will be explained by the following examples, but the contents of the present invention are not limited to these embodiments. Unless otherwise noted, "parts" and "%" are by mass.

(Example 1)

(Production of optical film)

(60 占 퐉, thickness: 60 占 퐉, manufactured by Fuji Photo Film Co., Ltd., TD60ULP) was prepared, and a composition for hard coat layer having the composition shown below was applied to one side of the light-transmitting substrate to form a coating film.

Subsequently, the formed coating film was passed through dry air at 70 DEG C for 15 seconds at a flow rate of 0.2 m / s for 15 seconds, then dried at 70 DEG C for 30 seconds at a flow rate of 10 m / s, Was evaporated.

Thereafter, ultraviolet rays were irradiated under a nitrogen atmosphere (oxygen concentration: 200 ppm or less) so that the accumulated light quantity became 50 mJ / cm 2 by using an ultraviolet irradiator (Fusion UV System Japan Co., Ltd., light source H bulb) (Hardened) hard coat layer was formed.

(Composition for hard coat layer)

50 parts by mass of urethane acrylate (UV1700B, manufactured by Nippon Gosei Co., Ltd.)

50 parts by mass of polyester acrylate (M9050, manufactured by Toagose KK)

4 parts by mass of a polymerization initiator (Irgacure 184; manufactured by BASF)

150 parts by mass of methyl ethyl ketone

The composition (1) for a low refractive index layer (A) having the following composition was coated on the surface of the formed hard coat layer so that the film thickness after drying (50 占 폚 占 1 min) became 0.1 占 퐉 to form a coating film. After drying, the coating film was irradiated with ultraviolet rays at an integrated light quantity of 100 mJ / cm 2 under an atmosphere of nitrogen (oxygen concentration: 200 ppm or less) using an ultraviolet irradiation device (light source H bulb made by Fusion UV System Japan) (A) was formed to obtain an optical film.

(Composition (1) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                           140 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

The composition (1) for a low refractive index layer (A) was coated on one side of a light transmitting substrate (cellulose triacetate film, thickness 60 μm, manufactured by Fuji Film, TD60ULP) 0.1 mu m to form a coating film. After drying, the coating film was irradiated with ultraviolet light at an integrated light quantity of 100 mJ / cm 2 under an atmosphere of nitrogen (oxygen concentration: 200 ppm or less) using an ultraviolet irradiation device (light source H bulb made by Fusion UV System Japan) A low refractive index layer (B) having the same concavo-convex shape as that of the layer (A) was formed. Then, the base of the touch panel sensor was adhered to the side of the light-transmitting base material opposite to the side of the low refractive index layer (B) through an adhesive layer containing an acrylic pressure-sensitive adhesive to manufacture a touch panel.

The obtained optical film and the touch panel were arranged so as to face each other such that the gap between the low refractive index layer (A) and the low refractive index layer (B) was 0.3 mm, thereby manufacturing an optical laminate having the touch panel.

(Example 2)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (2) for a low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (2) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                            140 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Example 3)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (3) for a low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (3) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                             160 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Example 4)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (4) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (4) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                               70 parts by mass

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                               70 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Example 5)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (5) for a low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (5) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                             160 parts by mass

100 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Example 6)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (6) for a low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (6) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                              140 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 65 parts by mass (solid content)

20 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Example 7)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (7) for a low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (7) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                              160 parts by mass

100 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Example 8)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (8) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (8) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                              140 parts by mass

5 parts by mass of solid fine silica particles (average particle diameter: 250 nm) (manufactured by CIK Nanotech Co., Ltd.)

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 1)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (9) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (9) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                              120 parts by mass

100 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 2)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (10) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (10) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                              140 parts by mass

100 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 3)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (11) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (11) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                              120 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR) 70 parts by mass (solids content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 10 parts by mass (solid content)

20 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 4)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (12) for a low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (12) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                              110 parts by mass

100 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 5)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1, except that the composition (13) for the low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (13) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                               80 parts by mass

100 parts by mass of trimethylolpropane triacrylate (TMP-A) (manufactured by Kyoeisha Chemical Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 6)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (14) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (14) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                               60 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 7)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the following composition (15) for a low refractive index layer (A) was used instead of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (15) for low refractive index layer (A))

Hollow silica fine particles (average particle size: 50 nm) (manufactured by NIKKISOKU Co., Ltd.)

                                                              200 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 15 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeishige Chemical Co., Ltd.) 55 parts by mass (solid content)

30 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

(Comparative Example 8)

Low refractive index layer (A) An optical film was produced in the same manner as in Example 1 except that the composition (16) for the low refractive index layer (A) was used in place of the composition (1). An optical laminate having a touch panel was produced in the same manner as in Example 1 except that the obtained optical film was used.

(Composition (16) for low refractive index layer (A))

Hollow silica fine particles (average particle diameter: 60 nm) (manufactured by Nikkiso Co., Ltd.)

                                                              120 parts by mass

Fluorine-containing polymer (JN35) (manufactured by JSR Corporation) 30 parts by mass (solid content)

Fluorine-containing monomer (LINC3A) (manufactured by Kyoeisha Chemical Co., Ltd.) 60 parts by mass (solid content)

10 parts by mass of pentaerythritol triacrylate (PETA) (manufactured by Nippon Kayaku Co., Ltd.)

7 parts by mass of a polymerization initiator (Irgacure 127) (BASF)

5 parts by mass of a modified silicone oil (X22164E) (Shin-Etsu Chemical Co., Ltd.)

7000 parts by mass of methyl isobutyl ketone

Propylene glycol monomethyl ether acetate 800 parts by mass

The following evaluations were performed on the optical laminate provided with the touch panel manufactured in Examples and Comparative Examples. The results are shown in Table 1.

(Reflection Y value)

Reflected Y values of the surface A of the low refractive index layer A and the surface B of the low refractive index layer B of the touch panel of each optical film prepared in Examples and Comparative Examples were measured using MPC3100 manufactured by Shimadzu Corporation The 5? Specular reflectance was measured by a spectrophotometer in a wavelength range from 380 to 780 nm, and then calculated by a software (MPC3100 built-in) which converts the lightness into a brightness perceived by the human eye. At the time of measurement, a black tape (manufactured by Terao Chemical Co., Ltd.) was attached on the opposite side of the optical film and the measurement surface of the touch panel in order to prevent the back reflection.

(10-point average roughness (Rz) and average tilt angle (? A) in the low refractive index layer (A)

Analysis mode in SPIWin: 10-point average in the low refractive index layer (A) in the SPIWin compatible mode, using an L-trace of Atomic Force Microscope (AFM) manufactured by SII Nanotechnology Co., The roughness (Rz) and the average inclination angle (? A) were measured. The SPIWin compatibility mode is an analysis format extended in three dimensions based on the 1982 edition JIS standard (JIS B0601: 1982).

(Presence of Newton ring)

The optical laminate provided with the touch panel manufactured in the examples and the comparative example was measured in the case of placing two weight of 300 g so that the installation area was 1 cm 2 at an interval of 70 mm from the touch panel side, The presence or absence of Newton rings when two weights were placed were observed under a dark room lamp and a Na lamp light source, respectively, and evaluated according to the following criteria. In addition, it is difficult to observe Newton's rings when weighing one touch point on the touch panel. However, when weighing two points using two weights, we see Newton ring It is easy to observe.

◎: Newton ring is not visible in both 300g weight and 350g weight

○: When the weight of 350g is put on, the Newton ring appears to be tender.

△: Newton ring appears light when weighing 300g.

X: Newton ring clearly visible when weighing 300 g

(Scratch resistance)

The low refractive index layer (A) of the optical laminate provided with the touch panel manufactured in Examples and Comparative Examples was subjected to 10 reciprocating rubs with a friction weight of 200 g / cm 2 and 100 g / cm 2 using a # 0000 steel wool , The presence or absence of scratches was visually observed and evaluated according to the following criteria.

◎: No scratches at both 200g / ㎠ and 100g / ㎠

○: No scratches at 100 g / cm 2

X: scratches at 100 g / cm < 2 >

As shown in Table 1, in the optical laminate provided with the touch panel according to the example, Newton ring was not observed and the scratch resistance was also excellent.

On the other hand, the optical laminate provided with the touch panel according to the comparative example was neither excellent in Newton's ring nor in scratch resistance. In the optical laminate provided with the touch panel according to Comparative Example 7, the average inclination angle of the low refractive index layer (A) was large and the optical laminate having the touch panel according to Comparative Example 8 had the low refractive index layer A) was large, and the scratch resistance was lower than that of the optical laminate provided with the touch panel according to the embodiment.

The optical laminated body provided with the touch panel according to Examples 3 and 4 and the optical laminate including the touch panel according to Example 5 had the same reflection Y value, but the average inclination angle? A of the low refractive index layer (A) The optical stacked body provided with the touch panel according to Embodiments 3 and 4 having a larger size than the optical stacked body having the touch panel according to Example 5 was more effective in suppressing the occurrence of Newton rings.

The optical laminate having the touch panel according to Example 6, the optical laminate having the touch panel according to Example 7, the optical laminate having the touch panel according to Example 3, , The optical laminate having the touch panel according to Example 3, in which the average inclination angle? A of the low refractive index layer (A) was the same but the reflection Y value was smaller, The Newton ring was more effectively suppressed than the optical laminate having the touch panel.

In the optical laminate including the touch panel according to Comparative Example 1 and the touch panel according to Comparative Example 3, the average inclination angles? A of the low refractive index layer (A) The effect of suppressing the occurrence of Newton rings was improved in the optical laminate provided with the touch panel according to Comparative Example 3 where the reflection Y value was smaller than that of the optical laminate having the touch panel according to Comparative Example 1. [

In the optical laminated body provided with the touch panel according to Comparative Example 6, the reflection Y value was a large value of 2.0%, but since the average inclination angle a of the low refractive index layer A was a large value of 10 degrees, The effect of inhibiting the occurrence of the disease was improved.

Since the optical laminate provided with the touch panel of the present invention includes the above-described configuration, generation of Newton rings can be sufficiently suppressed, and a high-quality display image can be obtained. Therefore, the optical laminated body provided with the touch panel of the present invention can be applied to various fields such as a cathode ray tube display (CRT), a liquid crystal display (LCD), a plasma display (PDP), an electroluminescence display (ELD) FED), an electronic paper, a tablet PC, and the like.

10: Optical laminate with touch panel
11: Optical film
12: light-transmitting substrate
13: Hard coat layer
14: low refractive index layer (A)
15: Touch panel
16: Low refractive index layer (B)

Claims (7)

An optical film in which a hard coat layer and a low refractive index layer (A) are laminated in this order on one side of a light-transmitting substrate, and a touch panel having a touch panel having a low refractive index layer (B) And an optical element,
The optical film and the touch panel are opposed to each other such that the surface of the optical film on which the low refractive index layer (A) is laminated and the external surface of the touch panel on which the low refractive index layer (B) are laminated face each other with the gap therebetween However,
The surface A of the low refractive index layer A opposing the low refractive index layer B and the surface B of the low refractive index layer B facing the low refractive index layer A are concavely formed And,
The reflection Y value of the surface (A) and the surface (B) is 0.1% or more and less than 1.5%
Wherein the concavities and convexities of the surface A and the surface B have a ten-point average roughness Rz of 20 to 90 nm and an average inclination angle a of 5 to 20 DEG. . The method according to claim 1,
The low refractive index layer (A) and the low refractive index layer (B) each comprise a hollow silica fine particle and a fluorine atom-containing resin as a binder resin. 3. The method of claim 2,
Wherein the low refractive index layer (A) and the low refractive index layer (B) are provided with a touch panel having a hollow silica fine particle content of 80 to 200 parts by mass relative to 100 parts by mass of a solid content of the binder resin. The method according to claim 2 or 3,
Wherein the low refractive index layer (A) and the low refractive index layer (B) further comprise fine silica fine particles having an average particle diameter of 80 to 300 nm. A polarizing plate comprising a polarizing element,
A polarizing plate comprising an optical laminate having the touch panel according to claim 1 on the surface of the polarizing element. An image display apparatus comprising the optical laminate provided with the touch panel according to any one of claims 1 to 3 or the polarizer according to claim 5. An optical film in which a hard coat layer and a low refractive index layer (A) are laminated in this order on one side of a light-transmitting substrate, and a touch panel having a touch panel having a low refractive index layer (B) The present invention also provides a method for suppressing the occurrence of Newton rings using the optical laminate provided with the above-
The optical film and the touch panel are opposed to each other such that the surface of the optical film on which the low refractive index layer (A) is laminated and the external surface of the touch panel on which the low refractive index layer (B) are laminated face each other with the gap therebetween However,
The surface A of the low refractive index layer A facing the low refractive index layer B and the surface B of the low refractive index layer B facing the low refractive index layer A are formed And,
The reflection Y value of the surface (A) and the surface (B) is 0.1% or more and less than 1.5%
Wherein the surface roughness Rz of the surface A and the surface B is 20 to 90 nm and the average tilt angle a is 5 to 20 deg.

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