JP2013117584A - Hard coat film, transparent conductive laminate, and touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coat film which has an excellent hardness and can effectively prevent curling, and to provide a transparent conductive laminate and a touch panel comprising the hard coat film.SOLUTION: A hard coat film comprises: a transparent substrate layer; a first hard coat layer and a second hard coat layer which are successively formed on one surface of the substrate layer; and a third hard coat layer which is formed on the other surface of the substrate layer. The pencil hardness of the first hard coat layer is lower than the pencil hardness of the second hard coat layer, and the pencil hardness of the second hard coat layer is 3H or higher. The thickness of the first hard coat layer is 4 to 20 times the thickness of the second hard coat layer and the thickness of the second hard coat layer is in the range of 1 μm to 10 μm, while the thickness of the third hard coat layer is in the range of 50 nm to 10 μm.

Description

  The present invention relates to a hard coat film, a transparent conductive laminate including the hard coat film, and a touch panel including the transparent conductive laminate.

  Liquid crystal display modules (LCDs) are widely used as flat panel displays taking advantage of their features such as thinness, light weight, and low power consumption, and their applications are information on mobile phones, personal digital assistants (PDAs), personal computers, televisions, etc. It is expanding year after year as a display device. In recent years, characteristics required for liquid crystal display modules vary depending on applications, but include bright (higher brightness), easier viewing (wider viewing angle), energy saving, thinner and lighter, larger screen, and the like.

  As such a liquid crystal display module, there is a liquid crystal display module on which a touch panel is mounted in order to improve the operability and quickness of the viewer. A liquid crystal display module equipped with such a touch panel generally has a structure in which a touch panel, a liquid crystal display element, various optical sheets, and a backlight are superimposed in this order from the front surface side to the back surface side. Yes.

  As such a touch panel, there are an electrostatic capacity method, a resistance film method, an electromagnetic induction method, and the like. Capacitance methods include electrodes that extend in directions that cross each other and detect the input position by detecting that the capacitance between the electrodes changes when a finger or the like touches them, or transparent conductive films There are devices that detect an input position by applying a weak current flowing when a capacitor is formed in contact with or close to a finger by applying alternating current of the same phase and the same potential to both ends of the capacitor.

  In such a liquid crystal display module, in order to improve the impact resistance and ease of handling of the transparent conductive film and other optical members, a hard coat film is often disposed on the surface of the optical member. As such a hard coat film, one having a hard coat layer on the surface of a base material layer is known. As such a hard coat film, (1) a hard coat layer having a two-layer structure in which a first hard coat layer is provided on the surface of a base material layer and a second hard coat layer is provided on the surface of the first hard coat layer Have been proposed (see Japanese Patent Application Laid-Open No. 2000-71392). In the hard coat film described in this publication, a cured resin layer made of a blend of a radical polymerizable resin and a cationic polymerizable resin is provided as a first hard coat layer on the surface of the base material layer, and the surface of the first hard coat layer A second hard coat layer having substantially the same thickness as the first hard coat layer is provided to prevent curling and cracking while maintaining scratch resistance.

  The hard coat film having a two-layer hard coat layer includes: (2) the pencil hardness of the first hard coat layer as the inner layer is lower than the pencil hardness of the second hard coat layer as the outer layer; A coating layer having a thickness greater than that of the second hard coat layer has been proposed (see Japanese Patent Application Laid-Open No. 2007-219013). Since the hard coat film described in this publication is laminated by the same coating method, the first hard coat layer made of low-shrinkage urethane acrylate and the like and the second hard coat layer made of high-hardness urethane acrylate and the like are laminated. The thickness of the second hard coat layer is formed to be approximately half or more of the thickness of the first hard coat layer.

  However, in the hard coat film of (1) above, the first hard coat layer and the second hard coat layer have substantially the same thickness, so the first hard coat layer is thin and the surface of the hard coat film is sufficient. Does not play hardness. Further, in this hard coat film, when the thickness of the hard coat layer is increased in order to obtain a sufficient hardness, the second hard coat layer becomes excessively thick, and curling may occur.

  Moreover, since the thickness of the second hard coat layer is thinner than the thickness of the first hard coat layer, the hard coat film of the above (2) has a thickness that is substantially half or more of the thickness of the first hard coat layer. In addition, the surface of the hard coat film does not have sufficient hardness, and the occurrence of curling cannot be prevented accurately.

JP 2000-71392 A JP 2007-219013 A

  The present invention has been made in view of such circumstances, has a hard hardness and can effectively prevent curling, and a transparent conductive laminate including the hard coat film. An object is to provide a body and a touch panel including the transparent conductive laminate.

The invention made to solve the above problems is
A transparent substrate layer;
A first hard coat layer formed on one side of the substrate layer;
A second hard coat layer formed on one side of the first hard coat layer;
A third hard coat layer formed on the other surface side of the base material layer,
The pencil hardness of the first hard coat layer is lower than the pencil hardness of the second hard coat layer,
The pencil hardness of the second hard coat layer is 3H or more,
The thickness of the first hard coat layer is not less than 4 times and not more than 20 times the thickness of the second hard coat layer,
The thickness of the second hard coat layer is 1 μm or more and 10 μm or less,
It is a hard coat film whose thickness of the said 3rd hard coat layer is 50 nm or more and 10 micrometers or less.

  The said hard coat film can improve the hardness of the other surface side by the 3rd hard coat layer formed in the other surface side of a base material layer. In particular, the hard coat film improves the hardness of the other surface side of the base material layer by forming the third hard coat layer so as to have a thickness of 50 nm or more and 10 μm or less. Curling can be prevented from occurring due to the difference in hardness from the three hard coat layers. In the hard coat film, a first hard coat layer having a pencil hardness lower than that of the second hard coat layer is disposed between the base material layer and the second hard coat layer. Therefore, the hard coat film, while preventing curling due to the hardness difference between the base material layer and the second hard coat layer, by the first hard coat layer and the second hard coat layer, The hardness of one surface side of the hard coat film can be effectively increased. In particular, the hard coat film has a thickness of the second hard coat layer in the above range, and the thickness of the first hard coat layer with respect to the thickness of the second hard coat layer is kept at 4 times or more and 20 times or less. Curling can be suitably prevented from occurring due to the relatively high pencil hardness of the hard coat layer. In addition, since the first hard coat layer, the second hard coat layer, and the third hard coat layer have the above-described configuration, the hard coat film improves the hardness on both sides and improves the ease of handling and the like, and is thin. Can meet the demand for

  The hard coat film may have a pencil hardness of F to H in the first hard coat layer. Thereby, the hardness of the one surface side of the hard coat film can be further effectively increased.

  The hard coat film may have a thickness of the first hard coat layer of 20 μm or more and 100 μm or less. As a result, the occurrence of curling can be more suitably prevented.

  The hard coat film may have a pencil hardness of 8B or more and F or less. The hard coat film can suitably increase the hardness while preventing the curling even when the pencil hardness of the base material layer is within the above range.

  In the hard coat film, the main component of the base material layer is preferably a polycarbonate resin, a cycloolefin resin, or a polyethylene terephthalate resin. The hard coat film has a relatively low hardness, such as polycarbonate resin, cycloolefin resin, or polyethylene terephthalate resin, even when a resin that easily generates curl is used as a main component of the base material layer. Can be prevented, and the hardness can be effectively increased. The hard coat film can easily have an in-plane retardation value (Ro) and a thickness direction retardation value (Rth) by using a polycarbonate-based resin, a cycloolefin-based resin, or a polyethylene terephthalate-based resin as a main component of the base material layer. Can be small. The said hard coat film can improve impact resistance because the said base material layer has a polycarbonate-type resin as a main component. In addition, the hard coat film can effectively suppress a change in phase difference caused by an external force such as direct sunlight or heat generated by a display because the base material layer includes a cycloolefin resin as a main component. It is excellent in visual uniformity and can display fine images. The said hard coat film can raise hardness more effectively because the said base material layer has a polyethylene terephthalate type resin as a main component.

  The hard coat film may have an in-plane retardation value (Ro) of the substrate layer of 100 nm or less and a thickness direction retardation value (Rth) of 200 nm or less. Thereby, when the said hard coat film is superimposed and used for another optical member, a possibility that the optical function of this other optical member may be inhibited can be prevented.

  In the hard coat film, the main component of the first hard coat layer is preferably an ultraviolet curable resin. Thereby, manufacturing easiness can be improved. Moreover, the said hard coat film can prevent the thermal expansion and heat shrink which arise when heat is added to a base material layer, and can improve step stability.

  When the hard coat film contains an ultraviolet curable resin as a main component of the first hard coat layer, the ultraviolet curable resin may be a cationic polymerizable resin. Thereby, while being able to improve the adhesiveness with respect to a base material layer, the time-dependent change of adhesive force can be suppressed. Moreover, the said hard coat film can prevent generation | occurrence | production of a curl and can further improve dimensional stability by using a cationically polymerizable resin as a main component of a 1st hard coat layer.

  In the hard coat film, the first hard coat layer may contain an ultraviolet curable resin as a main component, and may contain an ultraviolet ray preventing agent. In general, when the main component of the first hard coat layer is an ultraviolet curable resin and the first hard coat layer contains an ultraviolet ray preventing agent, the curing rate of the first hard coat layer is reduced, and the productivity is increased. Decreases. However, since the hard coat film is set to have a relatively thick first hard coat layer, the first hard coat layer contains a sufficient amount of the UV preventive agent even if the concentration of the UV preventive agent is kept small. Can be made. Therefore, even when the hard coat film contains a sufficient amount of the ultraviolet light inhibitor in the first hard coat layer, the hard coat film suppresses the decrease in the curing rate of the first hard coat layer and prevents the productivity from decreasing. can do.

  In the hard coat film, the third hard coat layer may contain high refractive index fine particles in a dispersed manner. Thereby, the refractive index of a 3rd hard-coat layer can be improved.

  In the hard coat film, the refractive index of the third hard coat layer is preferably 1.6 or more and 2.3 or less. Thus, when the third hard coat layer side of the hard coat film is laminated on a transparent conductive layer such as a touch panel, the refractive index of the third hard coat layer and the refractive index of the transparent conductive layer, for example, the refractive index of ITO. It can be close to 1-2.2 (λ = 520 nm). As a result, the hard coat film can reduce the visibility of the electrode pattern formed on the transparent conductive layer.

In addition, the transparent conductive laminate made to solve the above problems is
The hard coat film in which the third hard coat layer contains high refractive index fine particles dispersedly, and
And a transparent conductive layer laminated on the other surface of the third hard coat layer of the hard coat film.

  Since the transparent conductive laminate includes the hard coat film, curling of the hard coat film can be suitably prevented. Moreover, since the said transparent conductive laminated body is equipped with the said hard coat film, while improving the hardness of both sides and improving the ease of handling etc., the request | requirement of thickness reduction can be satisfy | filled. Furthermore, when the transparent conductive laminate is used for a touch panel, for example, by bringing the refractive index of the third hard coat layer close to the refractive index of the transparent conductive layer, the visibility of the electrode pattern formed on the transparent conductive layer is improved. Can be reduced.

  In the transparent conductive laminate, the difference between the refractive index of the third hard coat layer and the refractive index of the transparent conductive layer is preferably 0.6 or less. Thereby, the visibility of the electrode pattern formed in a transparent conductive layer can further be reduced.

Furthermore, the touch panel made to solve the above problems is
It is a touch panel provided with the said transparent conductive laminated body.

  Since the said touch panel is provided with the said hard coat film, it can prevent suitably curling to this hard coat film. Moreover, since the said touch panel is provided with the said hard coat film, while improving the hardness of a double-sided side and improving a handleability etc., it can satisfy | fill the request | requirement of thickness reduction. Furthermore, the touch panel can reduce the visibility of the electrode pattern formed on the transparent conductive layer by bringing the refractive index of the third hard coat layer close to the refractive index of the transparent conductive layer.

  In addition, in this invention, "pencil hardness" means the value based on the pencil scratch value as described in the test method prescribed | regulated to JISK5600-5-4. In the present invention, the pencil hardness of the first hard coat layer, the pencil hardness of the second hard coat layer, and the pencil hardness of the third hard coat layer are all higher than the pencil hardness of the base material layer. “Thickness” refers to the average thickness measured according to JIS K7130. The “in-plane retardation value (Ro)” is a value obtained by Ro = (Ny−Nx) × d, and the “thickness direction retardation value (Rth)” is Rth = ((Nx + Ny) / 2−Nz). This is a value obtained by xd. Here, Nx is the refractive index of the fast axis of the film (axis parallel to the plane direction), and Ny is the refractive index of the slow axis of the film (axis parallel to the plane direction and perpendicular to the fast axis). Nz is the refractive index of the film in the thickness direction (direction perpendicular to the surface direction), and d is the thickness of the film.

  The “ultraviolet ray inhibitor” is an additive having a function of preventing photodegradation due to ultraviolet rays, and is a concept including an ultraviolet absorber, an ultraviolet stabilizer and the like.

  As explained above, the hard coat film of the present invention and the transparent conductive laminate comprising this hard coat film, and the touch panel comprising this transparent conductive laminate, can improve the hardness of the hard coat film, In addition, curling can be effectively prevented.

It is a typical sectional view showing the hard coat film concerning one embodiment of the present invention. It is typical sectional drawing which shows the hard coat film which concerns on the form different from the hard coat film of FIG. It is a typical sectional view showing the transparent conductive layered product concerning one embodiment of the present invention. It is typical sectional drawing which shows the touchscreen which concerns on one Embodiment of this invention. It is typical sectional drawing which shows the touch panel which concerns on the form different from the touch panel of FIG.

[First embodiment]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  The hard coat film 1 in FIG. 1 has a base material layer 2, a front surface side hard coat layer 3, and a back surface side hard coat layer 4 (corresponding to a third hard coat layer). In addition, when the said hard coat film 1 is adhere | attached with another member, the back surface side hard-coat layer 4 is arrange | positioned by the adhesion surface side, and the surface side hard-coat layer 3 is arrange | positioned by the other side.

(Base material layer 2)
Since the base material layer 2 needs to transmit light, the base material layer 2 is formed to be transparent, particularly colorless and transparent. Although the main component which comprises the base material layer 2 is not specifically limited, Typically, it selects from the group which consists of polycarbonate-type resin, cycloolefin-type resin, acrylic resin, polypropylene-type resin, and polyethylene terephthalate-type resin. These synthetic resins have excellent optical transparency and can transmit light rays well. Especially, as a main component which comprises the base material layer 2, polycarbonate-type resin, cycloolefin-type resin, or polyethylene terephthalate-type resin is preferable.

  The base material layer 2 may contain other optional components as long as the transparency and the desired strength are not impaired, but preferably contains 90% by mass or more, more preferably 98% by mass or more of the main component made of the above synthetic resin. Including. Examples of the optional components here include ultraviolet light inhibitors, lubricants, processing aids, plasticizers, impact resistance aids, phase difference reducing agents, matting agents, antibacterial agents, and fungicides.

  The polycarbonate resin forming the base material layer 2 is not particularly limited, and may be either a linear polycarbonate resin or a branched polycarbonate resin, but a linear polycarbonate resin and a branched polycarbonate resin A polycarbonate-based resin made of

  The linear polycarbonate-based resin is a linear aromatic polycarbonate-based resin produced by a known phosgene method or melting method, and includes a carbonate component and a diphenol component. Examples of the precursor for introducing the carbonate component include phosgene and diphenyl carbonate. Examples of the diphenol include 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (3,5-dimethyl-4-hydroxyphenyl) propane, and 1,1-bis (4-hydroxy). Phenyl) cyclohexane, 1,1-bis (3,5-dimesyl-4-hydroxyphenyl) cyclohexane, 1,1-bis (4-hydroxyphenyl) decane, 1,1-bis (4-hydroxyphenyl) propane, , 1-bis (4-hydroxyphenyl) cyclodecane, 1,1-bis (3,5-dimethyl-4-hydroxyphenyl) cyclododecane, 4,4′-dihydroxydiphenyl ether, 4,4′-thiodiphenol, 4 , 4'-dihydroxy-3,3-dichlorodiphenyl ether and the like. These can be used alone or in combination of two or more. Such a linear polycarbonate resin is produced by, for example, the method described in US Pat. No. 3,998,672, and preferably has a refractive index of 1.57 or more and 1.59 or less.

  The branched polycarbonate resin is a polycarbonate resin produced using a branching agent. Examples of the branching agent include phloroglucin, trimellitic acid, 1,1,1-tris (4-hydroxyphenyl) ethane, 1, 1,2-tris (4-hydroxyphenyl) ethane, 1,1,2-tris (4-hydroxyphenyl) propane, 1,1,1-tris (4-hydroxyphenyl) methane, 1,1,1-tris (4-hydroxyphenyl) propane, 1,1,1-tris (2-methyl-4-hydroxyphenyl) methane, 1,1,1-tris (2-methyl-4-hydroxyphenyl) ethane, 1,1, 1-tris (3-methyl-4-hydroxyphenyl) methane, 1,1,1-tris (3-methyl-4-hydroxyphenyl) ethane, 1,1-tris (3,5-dimethyl-4-hydroxyphenyl) methane, 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl) ethane, 1,1,1-tris (3- Chloro-4-hydroxyphenyl) methane, 1,1,1-tris (3-chloro-4-hydroxyphenyl) ethane, 1,1,1-tris (3,5-dichloro-4-hydroxyphenyl) methane, , 1,1-tris (3,5-dichloro-4-hydroxyphenyl) ethane, 1,1,1-tris (3-bromo-4-hydroxyphenyl) methane, 1,1,1-tris (3-bromo -4-hydroxyphenyl) ethane, 1,1,1-tris (3,5-dibromo-4-hydroxyphenyl) methane, 1,1,1-tris (3,5-dibromo-4-hydroxyphenyl) Tan, 4,4'-dihydroxy-2,5-dihydroxydiphenyl ether, and the like.

  Such branched polycarbonate resins include, for example, aromatic diphenols, polycarbonate oligomers derived from the above branching agents and phosgene, aromatic diphenols, and the like, as described in JP-A No. 03-182524. A method in which an end stop agent is reacted while stirring so that the reaction mixture containing these becomes a turbulent flow, and when the viscosity of the reaction mixture rises, an aqueous alkali solution is added and the reaction mixture is reacted as a laminar flow. Can be manufactured. The branched polycarbonate resin of the resin composition of the present invention is contained in the polycarbonate resin in the range of 5 to 80% by mass, preferably in the range of 10 to 60% by mass. This is because if the branched polycarbonate-based resin is less than 10% by mass, the elongational viscosity decreases and molding by extrusion molding becomes difficult, and if it exceeds 80% by mass, the shear viscosity of the resin increases and the molding processability decreases. It is to do.

  The cycloolefin-based resin forming the base material layer 2 is not particularly limited as long as it is a resin having a monomer unit composed of a cyclic olefin (cycloolefin). The cycloolefin resin used for the substrate layer 2 may be either a cycloolefin polymer (COP) or a cycloolefin copolymer (COC), but a cycloolefin copolymer is more preferable.

  The cycloolefin copolymer refers to a non-crystalline cyclic olefin resin which is a copolymer of a cyclic olefin and an olefin such as ethylene. As the cyclic olefin, there are a polycyclic cyclic olefin and a monocyclic cyclic olefin. Such polycyclic olefins include norbornene, methylnorbornene, dimethylnorbornene, ethylnorbornene, ethylidenenorbornene, butylnorbornene, dicyclopentadiene, dihydrodicyclopentadiene, methyldicyclopentadiene, dimethyldicyclopentadiene, tetracyclododecene. , Methyltetracyclododecene, dimethylcyclotetradodecene, tricyclopentadiene, tetracyclopentadiene, and the like. Examples of monocyclic olefins include cyclobutene, cyclopentene, cyclooctene, cyclooctadiene, cyclooctatriene, and cyclododecatriene.

  The acrylic resin forming the base material layer 2 is a resin having a skeleton derived from acrylic acid or methacrylic acid. Examples of acrylic resins include, but are not limited to, poly (meth) acrylic acid esters such as polymethyl methacrylate, methyl methacrylate- (meth) acrylic acid copolymers, and methyl methacrylate- (meth) acrylic acid esters. Copolymer, methyl methacrylate-acrylic ester- (meth) acrylic acid copolymer, (meth) methyl acrylate-styrene copolymer, polymer having an alicyclic hydrocarbon group (for example, methyl methacrylate- Cyclohexyl methacrylate copolymer, methyl methacrylate- (meth) acrylate norbornyl copolymer), and the like. Among these acrylic resins, poly (meth) acrylic acid C1-6 alkyl such as poly (meth) methyl acrylate is preferable, and methyl methacrylate resin is more preferable.

  The polypropylene resin forming the base material layer 2 is a resin having a skeleton derived from propylene. Although it does not specifically limit as an example of a polypropylene resin, Copolymer of propylene homopolymer or propylene, and 1 or more types of monomers selected from the group which consists of ethylene and a C4-C12 alpha olefin. A polymer etc. are mentioned.

  The polyethylene terephthalate resin forming the base material layer 2 is a polymer obtained by the reaction of terephthalic acid and ethylene glycol. The polyethylene terephthalate-based resin may contain other comonomers, but those having a repeating unit of polyethylene terephthalate of 80 mol% or more are preferable. Polyethylene terephthalate is prepared by, for example, charging dimethyl terephthalate and ethylene glycol into a reactor, performing an ester exchange reaction while gradually raising the internal temperature, then transferring the reaction product to the polymerization reactor, and performing a polymerization reaction under high temperature vacuum Can be generated.

  Although it does not specifically limit as an in-plane retardation value (Ro) of the base material layer 2, 100 nm or less is preferable. The upper limit value of the in-plane retardation value of the base material layer 2 is more preferably 50 nm, further preferably 15 nm, and particularly preferably 5 nm. Moreover, it does not specifically limit as a thickness direction retardation value (Rth) of the base material layer 2, However 200 nm or less is preferable. The upper limit of the thickness direction retardation value of the base material layer 2 is more preferably 100 nm, further preferably 30 nm, and particularly preferably 10 nm. The hard coat film 1 thus reduces the in-plane retardation value (Ro) and the thickness direction retardation value (Rth), thereby suppressing the conversion effect of transmitted light, and the hard coat film is applied to other optical members. When 1 is used in a superimposed manner, it is possible to prevent the possibility of hindering the optical functions of other optical members.

  The pencil hardness of the base material layer 2 is not particularly limited. For example, a higher hardness is preferable for increasing the hardness after the hard coat is applied, but it may be 8B or more and F or less. The hard coat film 1 effectively increases the pencil hardness of one surface side to about 2H or more and about 6H or less while preventing the occurrence of curling even if the pencil hardness of the base material layer 2 is in the above range. Can do.

  Although it does not specifically limit as thickness of the base material layer 2, For example, 20 micrometers or more and 200 micrometers or less are preferable. The upper limit value of the thickness of the base material layer 2 is more preferably 150 μm, and particularly preferably 100 μm. On the other hand, the lower limit of the thickness of the base material layer 2 is more preferably 30 μm, and particularly preferably 50 μm. When the thickness of the base material layer 2 exceeds the above upper limit, the line speed and productivity during production are reduced, and when the hard coat film 1 is used in a liquid crystal display device, the liquid crystal display device is made thinner. May violate requirements. On the contrary, when the thickness of the base material layer 2 is less than the above lower limit value, the strength and rigidity are reduced, and there is a possibility that the anti-bending property and the like are lowered.

  As the base material layer 2, one having an arithmetic average surface roughness (Ra) of 0.02 or more and 0.06 or less can be used. Further, the base material layer 2 can be subjected to a mat treatment as necessary. The arithmetic average surface roughness (Ra) of the base material layer 2 subjected to such a mat treatment is preferably 0.07 or more and 2 or less, more preferably 0.1 or more and 1 or less. By controlling the surface roughness of the base material layer 2 in such a range, scratches in the processing after the film raw fabric is manufactured are prevented, and the handleability is improved. Moreover, generally, when winding up the manufactured film original fabric, it is necessary to prevent blocking by embossing (knurling) both ends in the width direction of the film. When a knurling process is performed on a film, the processing points at both ends of the film cannot be used, so that part must be cut and discarded. In the film winding operation, masking may be performed with a protective film in order to prevent damage. However, by making the arithmetic average surface roughness of the base material layer 2 within the predetermined range as described above, blocking can be prevented without performing a knurling treatment, so that the manufacturing process is simplified, and the film width direction Both end portions of the film can be used, and the film can be wound over a long length without causing a film failure. Moreover, when the base material layer 2 has moderate surface roughness, the damage at the time of winding is suppressed effectively, and the above masking is also unnecessary.

  Although the manufacturing method of the base material layer 2 is not particularly limited, for example, a synthetic resin flake raw material and additives such as a plasticizer are mixed by a conventionally known mixing method to obtain a thermoplastic resin composition in advance. Layer 2 can be produced. This thermoplastic resin composition can be obtained, for example, by pre-blending with a mixer such as an omni mixer and then extruding and kneading the resulting mixture. In this case, the kneader used for extrusion kneading is not particularly limited, and for example, a conventionally known kneader such as an extruder such as a single screw extruder or a twin screw extruder or a pressure kneader can be used. .

  Examples of the method for forming the base material layer 2 include known methods such as a solution casting method (solution casting method), a melt extrusion method, a calendar method, and a compression molding method. Among these, the solution casting method (solution casting method) and the melt extrusion method are preferable. At this time, a thermoplastic resin composition extruded and kneaded in advance may be used, or another additive such as a synthetic resin and a plasticizer is separately dissolved in a solvent to obtain a uniform mixed solution, and then a solution cast. You may use for the film forming process of a method (solution casting method) and a melt extrusion method. Moreover, in order to keep the retardation value of the base material layer 2 and the retardation value of the hard coat film 1 constant, for example, the molten resin is formed into an arc shape with a cooling roll and an endless belt maintained at a uniform temperature in the width direction. It may be sandwiched and cooled.

  Solvents used in the solution casting method (solution casting method) include, for example, chlorinated solvents such as chloroform and dichloromethane; aromatic solvents such as toluene, xylene, benzene, and mixed solvents thereof; methanol, ethanol, and isopropanol And alcohol solvents such as n-butanol and 2-butanol; methyl cellosolve, ethyl cellosolve, butyl cellosolve, dimethylformamide, dimethyl sulfoxide, dioxane, cyclohexanone, tetrahydrofuran, acetone, methyl ethyl ketone (MEK), ethyl acetate, diethyl ether, etc. It is done. These solvents may be used alone or in combination of two or more. Examples of the apparatus for performing the solution casting method (solution casting method) include a drum casting machine, a band casting machine, and a spin coater.

  Examples of the melt extrusion method include a T-die method and an inflation method. The film forming temperature during melt extrusion is preferably 150 ° C. or higher and 350 ° C. or lower, more preferably 200 ° C. or higher and 300 ° C. or lower. When film-forming by the T-die method, a T-die is attached to the tip of a known single-screw extruder or twin-screw extruder, and the film extruded into a film shape is wound to obtain a roll film. Under the present circumstances, it is also possible to set it as a uniaxial stretching process by adjusting the temperature of a winding roll suitably, and adding extending | stretching to an extrusion direction. It is also possible to add steps such as sequential biaxial stretching and simultaneous biaxial stretching by adding a step of stretching the film in a direction perpendicular to the extrusion direction.

(Surface coating layer 3)
The front-side hard coat layer 3 has a first hard coat layer 5 and a second hard coat layer 6. Although it does not specifically limit as thickness of the surface side hard-coat layer 3, 21 micrometers or more and 105 micrometers or less are preferable. The upper limit value of the thickness of the surface-side hard coat layer 3 is more preferably 82 μm and even more preferably 63 μm. On the other hand, the lower limit of the thickness of the surface-side hard coat layer 3 is more preferably 32 μm, and even more preferably 43 μm. When the thickness of the surface-side hard coat layer 3 exceeds the above upper limit value, the curl generation preventing action is not promoted so much, and there is a possibility that it contradicts the demand for thinning the hard coat film 1. On the other hand, when the thickness of the surface side hard coat layer 3 is less than the lower limit, curling may not be effectively prevented.

(First hard coat layer 5)
The first hard coat layer 5 is formed on one surface of the base material layer 2. The first hard coat layer 5 may be formed of only a resin, or may contain additives such as an ultraviolet ray inhibitor. Although it does not specifically limit as a main component which comprises the 1st hard-coat layer 5, For example, resin formed from active energy ray hardening resin, a reactive silicon compound, etc. are mentioned. Examples of the active energy ray curable resin include an ultraviolet curable resin, an electron beam curable resin, and a radiation curable resin. Moreover, tetraethoxysilane etc. are mentioned as a reactive silicon compound. Among these, the main component of the first hard coat layer 5 is preferably an ultraviolet curable resin. The hard coat film 1 can improve manufacturability when the main component of the first hard coat layer 5 is an ultraviolet curable resin. In addition, the hard coat film 1 has a thermal expansion and contraction caused by heat applied to the base material layer 2 during production or the like because the main component of the first hard coat layer 5 is an ultraviolet curable resin. It is possible to prevent this, and to improve the walking stability. Examples of the ultraviolet curable resin include radical polymerizable resins and cationic polymerizable resins.

  As the ultraviolet polymerizable compound that forms the ultraviolet curable resin, a monomer or oligomer that is cured by a reaction such as polymerization or crosslinking with ultraviolet rays is used.

  Examples of the monomer include a radical polymerizable monomer and a cationic polymerizable monomer. Examples of the oligomer include radical polymerizable oligomers and cationic polymerizable oligomers.

  Examples of the radical polymerizable monomer include methyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyl (meth) acrylate, and the like. Monofunctional (meth) acrylates, dipropylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol Tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, etc. Various (meth) acrylates of capacity (meth) acrylates.

  Examples of the cationic polymerizable monomer include alicyclic epoxides such as 3,4-epoxycyclohexenylmethyl-3 ′, 4′-epoxycyclohexenecarboxylate, glycidyl ethers such as bisphenol A diglycidyl ether, 4-hydroxy Examples include vinyl ethers such as butyl vinyl ether, oxetanes such as 3-ethyl-3-hydroxymethyloxetane, and the like.

  Examples of the radical polymerizable oligomer include various (meth) acrylate oligomers such as urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, triazine (meth) acrylate, silicon (meth) acrylate, and trimethylol. Examples thereof include polythiol oligomers such as propane trithioglycolate and pentaerythritol tetrathioglycolate, and unsaturated polyester oligomers.

  Examples of the cationically polymerizable oligomer include novolak type epoxy resin oligomers and aromatic vinyl ether type resin oligomers.

  Especially, as an ultraviolet-ray polymerizable compound which forms the ultraviolet curable resin used for the 1st hard-coat layer 5, a cation polymerizable monomer or a cation polymerizable oligomer is preferable.

  In the hard coat film 1, an ultraviolet curable resin is used as a main component of the first hard coat layer 5, and a cationic polymerizable monomer or a cationic polymerizable oligomer is used as an ultraviolet polymerizable compound that forms the ultraviolet curable resin. As a result, the adhesiveness between the base material layer 2 and the first hard coat layer 5 can be improved, and the change in the adhesive force with time can be suppressed. Moreover, according to such a configuration, the hard coat film 1 can prevent curing shrinkage of the first hard coat layer 5 and further improve the dimensional stability.

  Moreover, as said cationically polymerizable monomer, alicyclic epoxides or oxetanes are preferable. Such alicyclic epoxides and oxetanes are relatively high in polarity, and the glass transition temperature of cationic polymerizable resins obtained from these polymerizable compounds is generally high. Therefore, the hard coat film 1 can improve heat resistance by using alicyclic epoxides or oxetanes as the cationic polymerizable monomer used in the first hard coat layer 5.

  Although it does not specifically limit as glass transition temperature of the said cation polymeric resin, 180 degreeC or more is preferable, 200 degreeC or more is more preferable, and 220 degreeC or more is especially preferable. The said hard coat film 1 can improve heat resistance remarkably because the glass transition temperature of a cation polymeric resin is the said range.

  In addition, the said monomer and oligomer can be used in mixture of 2 or more types according to the performance etc. which are requested | required.

  Further, as the ultraviolet polymerizable compound forming the ultraviolet curable resin used for the first hard coat layer 5, a radical polymerizable compound having low curing shrinkage is also preferably used. Examples of such radically polymerizable compounds include polymethacryloxypropylsilsesquioxane having a molecular weight of 1000 to 3000. Moreover, as an ultraviolet curable resin which has this radically polymerizable compound, the radically polymerizable resin mentioned by Unexamined-Japanese-Patent No. 2008-120845 is used, for example.

  Examples of the polymerization initiator contained in the first hard coat layer 5 include compounds such as benzophenone-based, thioxanthone-based, benzoin-based, and acetophenone-based compounds when the ultraviolet polymerizable compound is a radical polymerizable monomer or oligomer. . The polymerization initiator contained in the first hard coat layer 5 is a metallocene-based, aromatic sulfonium-based, aromatic iodonium-based compound or the like when the ultraviolet polymerizable compound is a cationic polymerizable monomer or oligomer. Is mentioned.

  Although it does not specifically limit as content of the said polymerization initiator, 1 mass% or more and 10 mass% or less are preferable with respect to ultraviolet curable resin, and 3 mass% or more and 6 mass% or less are more preferable. When content of a polymerization initiator exceeds the said upper limit, there exists a possibility that the polymerization degree of ultraviolet curable resin may fall and desired hardness may not be obtained. Conversely, when the content of the polymerization initiator is less than the above lower limit, the curing reaction may not proceed sufficiently.

  The first hard coat layer 5 may contain a solvent in order to improve the coatability. Examples of the solvent include aliphatic hydrocarbons such as hexane and octane; aromatic hydrocarbons such as toluene and xylene; alcohols such as ethanol, 1-propanol, isopropanol, and 1-butanol; methyl ethyl ketone, methyl isobutyl ketone, and the like. Ketones; Esters such as ethyl acetate, butyl acetate, isobutyl acetate; Glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether; ethylene glycol Organic solvents such as esterified glycol ethers such as monomethyl ether acetate and propylene glycol monomethyl ether acetate And the like. These organic solvents may be used alone or in combination as necessary. Such a solvent is preferably evaporated and dried in the manufacturing process of the first hard coat layer 5. Therefore, the boiling point of such a solvent is preferably in the range of 60 to 160 ° C. Moreover, it is preferable that the saturated vapor pressure in 20 degreeC of the said solvent is the range of 0.1-20 kPa. About the kind and content of a solvent, it adjusts suitably according to the main component of the base material layer 2, the main component of the 1st hard-coat layer 5, thickness, etc.

  The first hard coat layer 5 may contain an ultraviolet ray preventing agent. Examples of the ultraviolet light inhibitor contained in the first hard coat layer 5 include an ultraviolet light absorber and an ultraviolet light stabilizer.

  Examples of the UV absorber include salicylic acid UV absorbers, benzophenone UV absorbers, benzotriazole UV absorbers, cyanoacrylate UV absorbers, triazine UV absorbers, and benzoxazinone UV absorbers. 1 type or 2 types or more selected from these groups can be used. Of these, from the viewpoint of dispersibility, triazine-based ultraviolet absorbers and benzoxazinone-based ultraviolet absorbers are preferable. Moreover, as the ultraviolet absorber, a polymer having an ultraviolet absorbing group in the molecular chain is also preferably used. By using a polymer having an ultraviolet absorbing group in such a molecular chain, it is possible to prevent deterioration of the ultraviolet absorbing function due to bleeding out of the ultraviolet absorbent. Examples of the ultraviolet absorbing group include a benzotriazole group, a benzophenone group, a cyanoacrylate group, a triazine group, a salicylate group, and a benzylidene malonate group. Of these, a benzotriazole group, a benzophenone group, and a triazine group are particularly preferable.

  As the ultraviolet stabilizer, for example, a hindered amine ultraviolet stabilizer having high stability against ultraviolet rays is preferably used. When the first hard coat layer 5 contains an ultraviolet stabilizer, radicals, active oxygen, and the like generated by ultraviolet rays are inactivated, and ultraviolet stability, weather resistance, and the like can be improved. In addition, the 1st hard-coat layer 5 can improve the photodegradation prevention property with respect to an ultraviolet-ray, and a weather resistance markedly by using together an ultraviolet absorber and a ultraviolet stabilizer.

  Although it does not specifically limit as content (mass ratio) of the ultraviolet inhibitor with respect to the main component of the 1st hard-coat layer 5, 0.1 mass% or more and 10 mass% or less are preferable. The upper limit of the content of the ultraviolet light inhibitor relative to the main component of the first hard coat layer 5 is more preferably 8% by mass, and further preferably 5% by mass. On the other hand, the lower limit of the content of the ultraviolet light inhibitor relative to the main component of the first hard coat layer 5 is more preferably 1% by mass, and even more preferably 3% by mass. In the hard coat film 1, when the content of the ultraviolet light inhibitor relative to the main component of the first hard coat layer 5 exceeds the above upper limit, the durability of the first hard coat layer 5 may be lowered. Conversely, when the hard coat film 1 has a content of the ultraviolet light inhibitor relative to the main component of the first hard coat layer 5 that is less than the lower limit, the first hard coat layer 5 effectively exhibits the ultraviolet light prevention function. You may not be able to.

  The hard coat film 1 preferably contains an ultraviolet curable resin as a main component of the first hard coat layer 5 and contains an ultraviolet ray preventing agent. In general, when the main component of the first hard coat layer 5 is an ultraviolet curable resin and the first hard coat layer 5 contains an ultraviolet light inhibitor, the curing rate of the first hard coat layer 5 is slowed down, Productivity decreases. However, in the hard coat film 1, since the thickness of the first hard coat layer 5 is set to be relatively thick, even if the concentration of the ultraviolet light inhibitor is kept small, a sufficient amount of the ultraviolet light inhibitor is added to the first hard coat layer. 5 can be contained. Therefore, even when the hard coat film 1 contains a sufficient amount of the ultraviolet light inhibitor in the first hard coat layer 5, the decrease in the curing rate of the first hard coat layer 5 is suppressed, and the productivity is lowered. Can be prevented. In addition, when the polycarbonate-type resin is used for the said hard coat film 1 as a main component of the base material layer 2, yellowing etc. of the base material layer 2 are carried out because the 1st hard coat layer 5 contains an ultraviolet-ray inhibitor. Can be effectively prevented.

  The first hard coat layer 5 is formed to have a pencil hardness lower than that of the second hard coat layer 6. The pencil hardness of the first hard coat layer 5 is not particularly limited as long as it is lower than the pencil hardness of the second hard coat layer 6, but it is preferably F or more and H or less. In the hard coat film 1, when the pencil hardness of the first hard coat layer 5 exceeds the upper limit value, there is a high risk of curling due to the difference in hardness between the base material layer 2 and the first hard coat layer 5. Become. On the other hand, when the pencil hardness of the first hard coat layer 5 is less than the lower limit value, the hard coat film 1 may not be able to exhibit a desired hardness.

  The thickness of the first hard coat layer 5 is not less than 4 times and not more than 20 times the thickness of the second hard coat layer 6. The upper limit of the thickness of the first hard coat layer 5 is more preferably 18 times the thickness of the second hard coat layer 6 and even more preferably 16 times. Further, the lower limit of the thickness of the first hard coat layer 5 is more preferably 6 times the thickness of the second hard coat layer 6 and further preferably 8 times. When the thickness of the first hard coat layer 5 exceeds the above upper limit, the curl generation preventing action may not be promoted so much. On the other hand, when the thickness of the first hard coat layer 5 is less than the lower limit, curling may not be effectively prevented.

  The thickness of the first hard coat layer 5 is not particularly limited, but is preferably 20 μm or more and 100 μm or less. The upper limit value of the thickness of the first hard coat layer 5 is more preferably 80 μm, and further preferably 60 μm. On the other hand, the lower limit of the thickness of the first hard coat layer 5 is more preferably 30 μm and even more preferably 40 μm. When the thickness of the first hard coat layer 5 exceeds the above upper limit value, the curl generation preventing action is not promoted so much and there is a possibility that it is contrary to the demand for thinning the hard coat film 1. On the other hand, when the thickness of the first hard coat layer 5 is less than the above lower limit value, the occurrence of curling may not be effectively prevented.

  Although it does not specifically limit as a tensile elasticity modulus of the 1st hard-coat layer 5, It is preferable that they are 1 GPa or more and 4 GPa or less. Moreover, as an upper limit of the tensile elasticity modulus of the 1st hard-coat layer 5, 3.5 GPa is more preferable and 3 GPa is further more preferable. On the other hand, the lower limit value of the tensile elastic modulus of the first hard coat layer 5 is more preferably 1.5 GPa, and further preferably 2 GPa. When the tensile elastic modulus of the first hard coat layer 5 exceeds the above upper limit value, curling may not be effectively prevented. On the contrary, when the tensile elasticity modulus of the 1st hard-coat layer 5 is less than the said lower limit, there exists a possibility that it may become difficult to form the said hard-coat film 1 in desired hardness. The “tensile elastic modulus” in the present invention is a value measured according to JIS K7113.

The first hard coat layer 5 preferably has a value obtained by multiplying the tensile elastic modulus by the cube of the thickness is 20 kPa · mm ² or more and 500 kPa · mm ² or less, and 40 kPa · mm ² or more and 400 kPa · mm ² or less. more preferably in, even more preferably 60 kPa · mm ² or more 300 kPa · mm ² or less. When the value obtained by multiplying the tensile elastic modulus of the first hard coat layer 5 by the cube of the thickness exceeds the above upper limit, the rigidity of the first hard coat layer 5 becomes too large, and the hard coat film 1 is rolled. May be difficult to hold. Conversely, when the value obtained by multiplying the tensile elastic modulus of the first hard coat layer 5 by the cube of the thickness is less than the lower limit value, the first hard coat layer 5 is easily deformed and added to the base material layer 2. Stress may increase.

  The arithmetic average roughness (Ra) of the surface on one side of the first hard coat layer 5 is not particularly limited, but is preferably 0.5 μm or more and 8 μm or less. The upper limit value of the arithmetic mean roughness (Ra) of the surface on the one surface side of the first hard coat layer 5 is more preferably 7 μm, and further preferably 6 μm. On the other hand, the lower limit value of the arithmetic average roughness (Ra) on the surface of one surface of the first hard coat layer 5 is more preferably 1 μm, and particularly preferably 2 μm. When the arithmetic average roughness (Ra) of the surface on the one surface side of the first hard coat layer 5 exceeds the upper limit, the second hard coat layer 6 formed on the one surface side of the first hard coat layer 5. There is a possibility that the thickness of the film becomes thick. On the contrary, when the arithmetic average roughness (Ra) of the surface on the one surface side of the first hard coat layer 5 is less than the lower limit, the surface area on the one surface side of the first hard coat layer 5 is sufficiently increased. Therefore, the adhesion with the second hard coat layer 6 may be reduced. On the other hand, when the arithmetic mean roughness (Ra) of the surface on the one surface side of the first hard coat layer 5 is within the above range, the thickness of the second hard coat layer 6 is suitably maintained and The adhesion between the hard coat layer 5 and the second hard coat layer 6 can be effectively improved.

  Further, the ten-point average roughness (Rz) of the surface on one surface side of the first hard coat layer 5 is not particularly limited, but is preferably 0.5 μm or more and 10 μm or less. The upper limit value of the ten-point average roughness (Rz) of the surface on one surface side of the first hard coat layer 5 is more preferably 9 μm, and further preferably 8 μm. On the other hand, the lower limit of the ten-point average roughness (Rz) of the surface on the one surface side of the first hard coat layer 5 is more preferably 1 μm, and further preferably 2 μm. When the ten-point average roughness (Rz) of the surface on the one surface side of the first hard coat layer 5 exceeds the upper limit, there is a high possibility that the thickness of the second hard coat layer 6 is increased. Conversely, when the ten-point average roughness (Rz) of the surface on one surface side of the first hard coat layer 5 is less than the lower limit, the surface area on the one surface side of the first hard coat layer 5 does not increase sufficiently. Therefore, the adhesiveness with the second hard coat layer 6 may be reduced. Note that “arithmetic average roughness (Ra)” and “ten-point average roughness (Rz)” are values according to JIS B0601-2001.

  Although the manufacturing method of the 1st hard-coat layer 5 is not specifically limited, It can manufacture by apply | coating active energy ray hardening resin to one surface of the base material layer 2, making it dry, and irradiating active energy ray. The application method of the active energy ray curable resin is not particularly limited as long as it is a method capable of uniformly applying the active energy ray curable resin to one surface of the base material layer 2. For example, the spin coating method and the spray method are used. And various methods such as a slide coating method, a dip method, a bar coating method, a roll coater method, and a screen printing method. In manufacturing the first hard coat layer 5, surface modification treatment such as plasma treatment in an inert gas atmosphere such as argon gas or nitrogen gas may be performed as a pretreatment as necessary. Alternatively, an undercoat layer may be laminated on the surface of the base material layer 2 and the first hard coat layer 5 may be laminated via the undercoat layer.

(Second hard coat layer 6)
The second hard coat layer 6 is formed on one surface of the first hard coat layer 5. The material for forming the second hard coat layer 6 is not particularly limited. The second hard coat layer 6 may be formed of only a resin, or may contain additives such as silica fine particles.

  Examples of the resin forming the second hard coat layer 6 include a thermosetting resin and an active energy ray curable resin.

  The second hard coat layer 6 is formed by, for example, applying a coating composition containing a polymerizable monomer or a polymerizable oligomer of an active energy ray curable resin on one surface of the first hard coat layer 5, so that the polymerizable monomer or the polymerizable monomer is polymerizable. The oligomer can be formed by a crosslinking reaction and / or a polymerization reaction.

  The functional group of the active energy ray-curable polymerizable monomer or polymerizable oligomer is preferably an ultraviolet ray, electron beam or radiation polymerizable functional group, and an ultraviolet polymerizable functional group is particularly preferred. Examples of the ultraviolet polymerizable functional group include ethylenically unsaturated polymerizable functional groups such as (meth) acryloyl group, vinyl group, styryl group and allyl group.

  Although it does not specifically limit as said coating composition, The thing which has an acrylic monomer or a urethane acrylate oligomer as a main component is preferable. The 2nd hard-coat layer 6 can raise hardness by being formed from the composition which has these monomers or oligomers as a main component. Among these, the second hard coat layer 6 is particularly preferably formed from a composition containing both urethane acrylate and (meth) acrylate.

  The total content of urethane acrylate and (meth) acrylate forming the second hard coat layer 6 is preferably 45% by mass or more and 99% by mass or less, more preferably 50% by mass or more and 95% by mass or less, and 60% by mass or more. 90 mass% or less is especially preferable. If the total content of urethane acrylate and (meth) acrylate forming the second hard coat layer 6 exceeds the above upper limit, the start of photopolymerization may be delayed and productivity may be reduced. Moreover, there exists a possibility that a softness | flexibility, abrasion resistance, scratch resistance, etc. may fall that the total content of the urethane acrylate and (meth) acrylate which forms the 2nd hard-coat layer 6 is less than the said minimum. On the other hand, when the total content of urethane acrylate and (meth) acrylate forming the second hard coat layer 6 is within the above range, it is preferable to improve flexibility, wear resistance, scratch resistance, etc. while improving productivity. Can keep.

  The urethane acrylate is not particularly limited, and may be either a monomer or an oligomer. In addition, the number of functional groups of urethane acrylate is not particularly limited, and may be monofunctional or polyfunctional, but is preferably 2 or more and 6 or less, and preferably 2 or more and 3 or more. More preferably, it is as follows. The 2nd hard-coat layer 6 can keep suitably the balance of hardness and elongation rate by making the number of functional groups of urethane acrylate into the said range. Urethane acrylates may be used alone or in combination of two or more.

  Although it does not specifically limit as glass transition temperature of resin formed from urethane acrylate, 40 to 100 degreeC is preferable and 40 to 80 degreeC is more preferable. When the glass transition temperature of the resin formed from urethane acrylate is within the above range, the hardness and durability of the second hard coat layer 6 at room temperature can be improved.

  Although it does not specifically limit as content of the urethane acrylate which forms the 2nd hard-coat layer 6, 10 to 90 mass% is preferable, 15 to 85 mass% is more preferable, 20 to 80 mass% A mass% or less is particularly preferred. If the content of the urethane acrylate forming the second hard coat layer 6 exceeds the above upper limit, the wear resistance and the coating film hardness may be reduced. Moreover, a softness | flexibility falls that the content of the urethane acrylate which forms the 2nd hard-coat layer 6 is less than the said minimum, and there exists a possibility that a crack will generate | occur | produce. On the other hand, if the content of the urethane acrylate forming the second hard coat layer 6 is within the above range, the wear resistance and the coating film hardness are suitably maintained while maintaining appropriate flexibility and suppressing the occurrence of cracks. can do.

  The (meth) acrylate is not particularly limited, and may be either a monomer or an oligomer. The number of functional groups of such (meth) acrylate is not particularly limited, and may be monofunctional or polyfunctional. In addition, durability can improve the 2nd hard-coat layer 6 by using (meth) acrylate more than trifunctional. The (meth) acrylate may have a molecular structure having a polar group or a low-polar molecular structure. (Meth) acrylates may be used alone or in combination of two or more.

  Examples of the polar group of (meth) acrylate include a hydroxyl group, a carboxyl group, an amino group, and an amide group.

  Examples of the (meth) acrylate containing a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 2-hydroxy-3-phenoxypropyl (meth). Acrylate, 2- (meth) acryloyloxyethyl-2-hydroxypropyl phthalate, glycerol mono (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate And (meth) acrylic acid hydroxyl group-containing esters.

  Examples of the (meth) acrylate containing a carboxyl group include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, and 2- (meth) acryloyloxyethyl succinic acid. Examples include acid, 2- (meth) acryloyloxyethyl phthalic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, and the like.

  Examples of (meth) acrylates containing amino groups include monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylaminopropyl (meth) acrylate, and monoethylaminopropyl (meth) acrylate. And (meth) acrylic acid monoalkylamino esters.

  Examples of the (meth) acrylate containing an amide group include acrylamides such as (meth) acrylamide, N-methyl (meth) acrylamide, and N-methylol (meth) acrylamide.

  Examples of the (meth) acrylate having a low polar molecular structure include (meth) acrylic acid alicyclic ester or (meth) acrylic acid alkyl ester.

  Examples of such (meth) acrylic acid alicyclic esters include cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, dicyclopentadienyl (meth) acrylate, and tricyclodecanyl. (Meth) acrylate, norbornyl (meth) acrylate, etc. are mentioned.

  Examples of the (meth) acrylic acid alkyl ester include lauryl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, benzyl (meth) acrylate, stearyl (meth) acrylate, butyl (meth) acrylate, 1,6-hexanediol acrylate may be mentioned.

  Although it does not specifically limit as content of the (meth) acrylate which forms the 2nd hard-coat layer 6, 5 mass% or more and 85 mass% or less are preferable, 10 mass% or more and 80 mass% or less are more preferable, 15 mass% More preferably, it is 75% by mass or less. If the content of (meth) acrylate forming the second hard coat layer 6 exceeds the above upper limit, there is a high possibility that cracking will occur during molding. Moreover, there exists a possibility that abrasion resistance and coating-film hardness may fall that content of the (meth) acrylate which forms the 2nd hard-coat layer 6 is less than the said minimum. On the other hand, if the content of the (meth) acrylate forming the second hard coat layer 6 is within the above range, the wear resistance and the coating film hardness are suitably maintained, while maintaining appropriate flexibility and generation of cracks. Can be suppressed.

  Examples of the polymerization initiator include benzophenone, benzyl, Michler's ketone, 2-chlorothioxanthone, 2,4-diethylthioxanthone, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2,2-diethoxyacetophenone, benzyldimethyl ketal, 2,2-dimethoxy-1,2-diphenylethane-1-one, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholinopropanone-1, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, bis (cyclopentadi Enyl) -bis (2,6- Fluoro-3- (pyr-1-yl) titanium, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2,4,6-trimethylbenzoyldiphenylphosphine oxide, etc. Note that these compounds may be used alone or in combination.

  The pencil hardness of the second hard coat layer 6 is 3H or more. The pencil hardness of the second hard coat layer 6 is more preferably 4H or more, and further preferably 5H or more. When the pencil hardness of the second hard coat layer 6 is less than the lower limit, it may be difficult to form the hard coat film 1 to a desired hardness.

  The thickness of the second hard coat layer 6 is 1 μm or more and 10 μm or less. The upper limit value of the thickness of the second hard coat layer 6 is more preferably 8 μm, and further preferably 6 μm. On the other hand, the lower limit value of the thickness of the second hard coat layer 6 is more preferably 2 μm, and further preferably 3 μm. When the thickness of the second hard coat layer 6 exceeds the above upper limit, the occurrence of curling cannot be effectively prevented, and there is a risk that the demand for thinning the hard coat film 1 may be violated. On the other hand, when the thickness of the second hard coat layer 6 is less than the lower limit, it may be difficult to form the hard coat film 1 with a desired hardness.

  Although it does not specifically limit as a tensile elasticity modulus of the 2nd hard-coat layer 6, It is preferable that it is 1.5 GPa or more and 6 GPa or less. Further, the upper limit value of the tensile elastic modulus of the second hard coat layer 6 is more preferably 5.5 GPa, further preferably 5 GPa. On the other hand, the lower limit value of the tensile elastic modulus of the second hard coat layer 6 is more preferably 2 GPa, and further preferably 2.5 GPa. When the tensile elastic modulus of the second hard coat layer 6 exceeds the above upper limit, it may be difficult to effectively prevent curling. On the contrary, when the tensile elasticity modulus of the 2nd hard-coat layer 6 is less than the said lower limit, there exists a possibility that it may become difficult to form the said hard-coat film 1 in desired hardness.

  The ratio of the tensile elastic modulus of the second hard coat layer 6 and the tensile elastic modulus of the first hard coat layer 5 is not particularly limited, but is preferably 1.5 or more and 4 or less. The upper limit of the ratio of the tensile elastic modulus of the second hard coat layer 6 to the tensile elastic modulus of the first hard coat layer 5 is more preferably 3.5, and even more preferably 3. On the other hand, the lower limit of the ratio between the tensile elastic modulus of the second hard coat layer 6 and the tensile elastic modulus of the first hard coat layer 5 is more preferably 1.7, and even more preferably 2. When the ratio of the tensile elastic modulus exceeds the upper limit, it may be difficult to effectively prevent curling. On the contrary, when the ratio of the tensile elastic modulus is less than the lower limit, the hardness of the hard coat film 1 may not be effectively increased.

  Although the manufacturing method of the 2nd hard coat layer 6 is not specifically limited, The method similar to the 1st hard coat layer 5 can be used.

(Back side hard coat layer 4)
The back side hard coat layer 4 is formed on the other side of the base material layer 2. The main component constituting the back side hard coat layer 4 is the same as that of the first hard coat layer 5. The additive contained in the back side hard coat layer 4 is the same as that of the first hard coat layer 5.

  The pencil hardness of the back side hard coat layer 4 is not particularly limited. Further, the thickness of the back side hard coat layer 4 is set to 50 nm or more and 10 μm or less. The upper limit value of the thickness of the back side hard coat layer 4 is more preferably 7 μm, and further preferably 5 μm. On the other hand, the lower limit of the thickness of the back side hard coat layer 4 is more preferably 100 nm, and further preferably 200 nm. When the thickness of the back surface side hard coat layer 4 exceeds the above upper limit value, the risk of curling is increased, and there is a risk that the demand for thinning the hard coat film 1 may be violated. On the contrary, when the thickness of the back surface side hard coat layer 4 is less than the lower limit value, there is a possibility that desired hardness cannot be achieved. On the other hand, when the thickness of the back surface side hard coat layer 4 is within the above range, the hardness can be suitably improved and curling can be prevented, and the thinning of the hard coat film 1 is promoted. be able to.

  Although the manufacturing method of the back surface side hard-coat layer 4 is not specifically limited, The method similar to the 1st hard-coat layer 5 can be used.

<Hard coat film 1>
Although it does not specifically limit as a haze value of the said hard coat film 1, 2% or less is preferable, 1% or less is more preferable, and 0.5% or less is further more preferable. When the haze value of the hard coat film 1 exceeds the above upper limit value, the visibility of the image is lowered, and the sharpness of the displayed image may be lowered.

  The visible light transmittance of the hard coat film 1 is not particularly limited, but is preferably 87% or more, and more preferably 90% or more. When the hard coat film 1 has a visible light transmittance of less than the above range, the visible light cannot be sufficiently transmitted, and the visibility may be reduced.

  The hard coat film 1 can improve the hardness of the other surface side by the back surface side hard coat layer 4 formed on the other surface side of the base material layer 2. In particular, the hard coat film 1 is formed so that the thickness of the back surface side hard coat layer 4 falls within the above range, thereby improving the hardness of the other surface side, and the base layer 2 and the back surface side hard coat layer. Curling can be prevented from occurring due to a difference in hardness from the layer 4. In the hard coat film 1, a first hard coat layer 5 having a pencil hardness lower than that of the second hard coat layer 6 is disposed between the base material layer 2 and the second hard coat layer 6. Therefore, the hard coat film 1 prevents the occurrence of curling due to the hardness difference between the base material layer 2 and the second hard coat layer 6, while the first hard coat layer 5 and the second hard coat film 1. The layer 6 can effectively increase the hardness of one surface side of the hard coat film 1. In particular, the hard coat film 1 has the first hard coat layer 5 formed relatively thick. Therefore, the hard coat film 1 can effectively perform a buffer function for preventing the occurrence of curling by the first hard coat layer 5, and the hardness of one surface side of the hard coat film 1 can be reduced. Can be suitably increased. As a result, the hard coat film 1 has a desired hardness in combination with the fact that the first hard coat layer 5 is formed relatively thick even if the second hard coat layer 6 is formed relatively thin. Can play. In addition, the first hard coat layer 5, the second hard coat layer 6 and the back side hard coat layer 4 have the above-described configuration, so that the hard coat film 1 has improved hardness on both sides and is easy to handle. It is possible to satisfy the demand for thinning.

  The hard coat film 1 may be a case where a resin having a relatively low hardness and easily causing curling is used as a main component of the base material layer 2 such as a polycarbonate resin, a cycloolefin resin, or a polyethylene terephthalate resin. Curling can be prevented and the hardness can be effectively increased. The hard coat film 1 has an in-plane retardation value (Ro) and a thickness direction retardation value (Rth) by using a polycarbonate resin, a cycloolefin resin or a polyethylene terephthalate resin as a main component of the base material layer 2. It can be easily reduced. The said hard coat film 1 can improve impact resistance because the base material layer 2 has a polycarbonate-type resin as a main component. In addition, the hard coat film 1 can effectively suppress a change in phase difference caused by an external force such as direct sunlight or heat generated by a display because the base layer 2 is mainly composed of a cycloolefin resin. It has excellent optical uniformity and can display fine images. The said hard coat film 1 can raise hardness more effectively because the base material layer 2 has a polyethylene terephthalate resin as a main component.

[Second Embodiment]
<Hard coat film 11>
The hard coat film 11 of FIG. 2 has a base material layer 2, a front surface side hard coat layer 3, and a back surface side hard coat layer 12 (corresponding to a third hard coat layer). Since the base material layer 2 and the front surface side hard coat layer 3 in the present embodiment are the same as the hard coat film 1 in FIG.

(Back side hard coat layer 12)
The back side hard coat layer 12 is formed on the other side of the base material layer 2. The main component (binder) constituting the back side hard coat layer 12, the additive contained in the back side hard coat layer 12, and the pencil hardness and thickness of the back side hard coat layer 12 are the same as those of the back side hard coat layer 4. It is.

The back side hard coat layer 12 contains high refractive index fine particles in a dispersed manner. Examples of the high refractive index fine particles dispersed and contained in the back side hard coat layer 12 include, for example, ZnO, TiO ₂ , CeO ₂ , SnO ₂ , ITO, Cs _0.33 WO ₃ , Al ₂ O ₃ , La ₂ O ₃ , ZrO ₂ , Y Inorganic materials such as ₂ O ₃ can be mentioned.

  The average particle diameter of the high refractive index fine particles is not particularly limited, but is preferably 1 nm or more and 100 nm or less. The upper limit of the average particle diameter of the high refractive index fine particles is more preferably 80 nm, and further preferably 60 nm. On the other hand, the lower limit of the average particle diameter of the high refractive index fine particles is more preferably 5 nm, and even more preferably 10 nm. When the average particle diameter of the high refractive index fine particles exceeds the upper limit, the transparency of the back side hard coat layer 12 may be lowered. On the contrary, when the average particle diameter of the high refractive index fine particles is less than the lower limit, the dispersibility of the high refractive index fine particles may be lowered.

  As a method for producing the back side hard coat layer 12, for example, the above-mentioned highly refractive fine particles are dispersed in a binder resin and diluted in a solvent, and then a roll coat method, a spin coat method, a dip coat method, a spray coat method, a bar coat, It can be formed by a known coating method such as a method, a knife coating method, a die coating method, an ink jet method, or a gravure coating method.

  Although it does not specifically limit as content with respect to the binder of the said high refractive index microparticles | fine-particles, For example, it can be 10 mass% or more and 60 mass% or less.

  Although it does not specifically limit as a refractive index of the back surface side hard-coat layer 12, 1.6 or more and 2.3 or less are preferable. The upper limit value of the refractive index of the back side hard coat layer 12 is more preferably 2.25, and further preferably 2.2. On the other hand, the lower limit of the refractive index of the back side hard coat layer 12 is more preferably 1.7, and even more preferably 1.75. When the refractive index of the back side hard coat layer 12 is not within the above range, the refractive index of the back side hard coat layer 12 when the back side hard coat layer 12 of the hard coat film 11 is laminated on a transparent conductive layer such as a touch panel. And the refractive index of the transparent conductive layer is increased, and the visibility of the electrode pattern formed on the transparent conductive layer is likely to be improved.

  The hard coat film 11 can improve the refractive index of the back side hard coat layer 12 because the back side hard coat layer 12 contains the high refractive index fine particles dispersedly. The haze value and visible light transmittance of the hard coat film 11 are the same as those of the hard coat film 1.

[Third embodiment]
<Transparent conductive laminate 21>
The transparent conductive laminate 21 in FIG. 3 has a hard coat film 11 and a transparent conductive layer 22. Since the hard coat film 11 in this embodiment is the same as the hard coat film 11 of FIG.

(Transparent conductive layer 22)
The transparent conductive layer 22 is laminated on the other surface of the back side hard coat layer 12. The material for forming the transparent conductive layer 22 is not particularly limited as long as it is a conductive material having transparency and conductivity, and examples thereof include inorganic metals and organic conductive polymers. Examples of the inorganic metal include gold, silver, copper, platinum, nickel, tin oxide, and indium tin oxide (ITO). Examples of the organic conductive polymer include organic conductive compositions using polyaniline, polythiophene, polypyrrole, polyquinoxaline, and the like. Of these, ITO or a polythiophene-based material having good optical characteristics, appearance, and conductivity is preferable.

  The method for applying the material for forming the transparent conductive layer 22 on the back side hard coat layer 12 is not particularly limited, but for example, a roll coat method, a spin coat method, a dip coat method, a spray coat method, a bar coat method, a knife coat. A known coating method such as a method, a die coating method, an ink jet method, or a gravure coating method can be used. In applying the material for forming the transparent conductive layer 22, pretreatment such as corona discharge treatment may be applied to the backside hard coat layer 12 in advance in order to improve the adhesion to the backside hard coat layer 12. Good.

As a method for curing the material for forming the transparent conductive layer 22, for example, a high-pressure mercury lamp, a halogen lamp, a xenon lamp, a nitrogen laser, an electron beam accelerator, an active energy ray source such as a radioactive element, or the like can be used. As the dose of the active energy ray, it is preferable 50 mJ / cm ² or more 5000 mJ / cm ² or less as the integrated quantity of light of a wavelength 365nm UV. When the irradiation amount exceeds the above upper limit, the active energy ray-curable resin may be colored. On the contrary, when the irradiation dose is less than the lower limit, curing may be insufficient.

  The transparent conductive layer 22 can also be formed by a dry process such as a sputtering method. As a method of forming the transparent conductive layer 22, it is preferable to use a sputtering method from the viewpoint of adhesion to the back side hard coat layer 12 and thinning.

  Although it does not specifically limit as thickness of the transparent conductive layer 22 in the case of forming by the said sputtering method, 50 to 2000 mm is preferable. The upper limit of the thickness of the transparent conductive layer 22 when formed by the sputtering method is preferably 1000 mm, and more preferably 500 mm. On the other hand, the lower limit of the thickness of the transparent conductive layer 22 when formed by the sputtering method is more preferably 70 mm, and further preferably 90 mm. When the thickness of the transparent conductive layer 22 is within the above range, both conductivity and transparency can be suitably maintained. Moreover, the said transparent conductive laminated body 21 can promote thickness reduction by making the thickness of the transparent conductive layer 22 into the said range, even when the thickness of the hard coat film 11 becomes comparatively thick.

  Since the transparent conductive laminate 21 includes the hard coat film 11, it is possible to suitably prevent curling of the hard coat film 11. Moreover, since the said transparent conductive laminated body 21 is equipped with the hard coat film 11, while improving the hardness of the both surfaces side of the hard coat film 11 and improving a handleability etc., it can satisfy | fill the request | requirement of thickness reduction. . Further, when the transparent conductive laminate 21 is used for a touch panel, for example, by bringing the refractive index of the back side hard coat layer 12 close to the refractive index of the transparent conductive layer 22, an electrode formed on the transparent conductive layer 22. The visibility of the pattern can be reduced.

  The difference between the refractive index of the back side hard coat layer 12 and the refractive index of the transparent conductive layer 22 is not particularly limited, but is preferably 0.6 or less, more preferably 0.5 or less, and further 0.3 or less. preferable. The transparent conductive laminate 21 has an electrode pattern formed on the transparent conductive layer 22 when the difference between the refractive index of the back side hard coat layer 12 and the refractive index of the transparent conductive layer 22 is within the above range. Visibility can be further reduced.

[Fourth embodiment]
<Touch panel 31>
The touch panel 31 in FIG. 4 is formed as a capacitive touch panel. The touch panel 31 includes a transparent conductive laminate 21, a glass substrate 32, and an adhesive layer 33. Since the transparent conductive laminate 21 in the present embodiment is the same as the transparent conductive laminate 21 of FIG.

  The transparent conductive laminate 21 is laminated on the glass substrate 32 via the adhesive layer 33. Although it does not specifically limit as the adhesion layer 33, The adhesion layer using well-known adhesive resins, such as an acrylic resin and a urethane-type resin, is mentioned. The touch panel 31 is disposed so that the hard coat film 11 is on the surface side (viewer side) of the transparent conductive layer 22.

  Since the touch panel 31 includes the hard coat film 11, curling of the hard coat film 11 can be suitably prevented. Moreover, since the said touch panel 31 is equipped with the hard coat film 11, it can satisfy the request | requirement of thickness reduction while improving the hardness of the both surfaces side of the hard coat film 11, improving a handleability etc. Furthermore, the touch panel 31 can reduce the visibility of the electrode pattern formed on the transparent conductive layer 22 by bringing the refractive index of the back side hard coat layer 12 close to the refractive index of the transparent conductive layer 22.

[Fifth embodiment]
<Touch panel 41>
The touch panel 41 in FIG. 5 is formed as a resistive film type touch panel. The touch panel 41 includes the transparent conductive laminate 21, a plurality of dot spacers 42, columnar spacers 43, a transparent conductive layer 44, a high refractive index layer 45, and a glass substrate 46. The touch panel 41 is disposed so that the hard coat film 11 is on the surface side of the transparent conductive layer 22.

  The plurality of dot spacers 42 are formed on the surface of the transparent conductive layer 44. Examples of the material for forming the dot spacer 42 include an insulating resin such as an epoxy resin and silicone. The columnar spacer 43 is disposed between the transparent conductive layer 22 and the transparent conductive layer 44. Examples of the material for forming the columnar spacer 43 include insulating resins such as epoxy resin, polyester, and acrylic resin. The columnar spacer 43 is fixed to the back side edge of the transparent conductive layer 22 and is fixed to the front side edge of the transparent conductive layer 44. The columnar spacer 43 is disposed so that the transparent conductive layer 22 and the transparent conductive layer 44 are separated from each other. The transparent conductive layer 44 is laminated on the surface of the high refractive index layer 45 by the same method as the transparent conductive layer 22. The material for forming the transparent conductive layer 44 is not particularly limited, and the same material as that for the transparent conductive layer 22 is used. The high refractive index layer 45 is laminated on the surface of the glass substrate 46. The material for forming the high refractive index layer 45 is not particularly limited, and the same material as that for the high refractive index layer 12 may be used. A method for laminating the high refractive index layer 45 is not particularly limited. For example, the high refractive index layer 45 is laminated on the surface of the glass substrate 46 via an adhesive layer (not shown).

  Since the touch panel 41 includes the hard coat film 11, curling of the hard coat film 11 can be suitably prevented. Moreover, since the said touch panel 41 is provided with the hard coat film 11, while improving the hardness of the both surfaces side of the hard coat film 11 and improving a handleability etc., the request | requirement of thickness reduction can be satisfy | filled. Furthermore, the touch panel 41 can reduce the visibility of the electrode pattern formed on the transparent conductive layer 22 by bringing the refractive index of the back side hard coat layer 12 close to the refractive index of the transparent conductive layer 22.

[Other Embodiments]
In addition, the hard-coat film of this invention, a transparent conductive laminated body provided with this hard-coated film, and a touch panel provided with this transparent conductive laminated body are implemented in the aspect which gave various changes and improvements other than the said aspect. be able to. For example, the hard coat film may have an adhesive layer formed on the other surface side. Examples of the adhesive layer include an adhesive layer using a known adhesive resin such as an acrylic resin or a urethane resin. The pressure-sensitive adhesive layer can be formed by applying a pressure-sensitive adhesive solution to the other surface side of the base material layer or the high refractive index layer and drying it. The pressure-sensitive adhesive layer can also be formed by applying a pressure-sensitive adhesive solution to one side of the separator in advance and drying it, and then bonding it to the third hard coat layer.

  In addition, the hard coat film contains the synthetic resin having a relatively high refractive index as a main component, instead of the third hard coat layer containing the high refractive index fine particles in a dispersed manner or containing the high refractive index fine particles in a dispersed manner. May be. Examples of such synthetic resins include phenol resins, melamine resins, polyurethane resins, urea resins, diallyl phthalate resins, guanamine resins, unsaturated polyester resins, aminoalkyd resins, melamine-urea cocondensation resins, silicon resins, polysiloxane resins, and the like. Can be mentioned. In the hard coat film, other layers (for example, a UV absorption layer, an antistatic layer, an antireflection layer, and the like) may be laminated on the second hard coat layer. The hard coat film is intermediate between the base material layer and the first hard coat layer, or between the first hard coat layer and the second hard coat layer, or between the base material layer and the third hard coat layer. A layer may be provided. The hard coat film can be used for various touch panels such as a capacitance method, a resistance film method, and an electromagnetic induction method. The hard coat film can be used for various liquid crystal display modules such as a stereoscopic video display device in addition to a touch panel. In addition to being laminated on the transparent conductive layer, the hard coat film can be used to reinforce the surface of various optical members, lenses, disks, healthy materials, miscellaneous goods and the like.

  As described above, the hard coat film of the present invention, the transparent conductive laminate provided with the hard coat film, and the touch panel provided with the transparent conductive laminate can improve the hardness of the hard coat film, and Curling can be effectively prevented, and it can be suitably used for a touch panel and other various liquid crystal display modules.

1 Hard Coat Film 2 Base Material Layer 3 Front Side Hard Coat Layer 4 Back Side Hard Coat Layer (Third Hard Coat Layer)
5 First hard coat layer 6 Second hard coat layer 11 Hard coat film 12 Back side hard coat layer (third hard coat layer)
DESCRIPTION OF SYMBOLS 21 Transparent conductive laminated body 22 Transparent conductive layer 31 Touch panel 32 Glass substrate 33 Adhesive layer 41 Touch panel 42 Dot spacer 43 Columnar spacer 44 Transparent conductive layer 45 High refractive index layer 46 Glass substrate

Claims (14)

A transparent substrate layer;
A first hard coat layer formed on one side of the substrate layer;
A second hard coat layer formed on one side of the first hard coat layer;
A third hard coat layer formed on the other surface side of the base material layer,
The pencil hardness of the first hard coat layer is lower than the pencil hardness of the second hard coat layer,
The pencil hardness of the second hard coat layer is 3H or more,
The thickness of the first hard coat layer is not less than 4 times and not more than 20 times the thickness of the second hard coat layer,
The thickness of the second hard coat layer is 1 μm or more and 10 μm or less,
The hard coat film whose thickness of the said 3rd hard coat layer is 50 nm or more and 10 micrometers or less.   The hard coat film according to claim 1, wherein the first hard coat layer has a pencil hardness of F or more and H or less.   The hard coat film according to claim 1 or 2, wherein the first hard coat layer has a thickness of 20 µm or more and 100 µm or less.   The hard coat film according to claim 1, wherein the substrate layer has a pencil hardness of 8B or more and F or less.   The hard coat film according to any one of claims 1 to 4, wherein a main component of the base material layer is a polycarbonate resin, a cycloolefin resin, or a polyethylene terephthalate resin.   The in-plane retardation value (Ro) of the base material layer is 100 nm or less, and the thickness direction retardation value (Rth) is 200 nm or less. The hard coat film according to any one of claims 1 to 5. .   The hard coat film according to any one of claims 1 to 6, wherein a main component of the first hard coat layer is an ultraviolet curable resin.   The hard coat film according to claim 7, wherein the ultraviolet curable resin is a cationic polymerizable resin.   The hard coat film according to claim 7 or 8, wherein the first hard coat layer contains an ultraviolet ray preventing agent.   The hard coat film according to any one of claims 1 to 9, wherein the third hard coat layer contains high refractive index fine particles in a dispersed manner.   The hard coat film according to claim 10, wherein the third hard coat layer has a refractive index of 1.6 or more and 2.3 or less. The hard coat film according to claim 10 or 11,
A transparent conductive laminate comprising: a transparent conductive layer laminated on the other surface of the third hard coat layer.   The transparent conductive laminate according to claim 12, wherein a difference between a refractive index of the third hard coat layer and a refractive index of the transparent conductive layer is 0.6 or less.   A touch panel comprising the transparent conductive laminate according to claim 12.

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