JP2006190189A - Touch panel plastic substrate and touch panel using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel plastic substrate having improved pen sliding resistance, weather resistance and surface hardness, and to provide a touch panel using the same. <P>SOLUTION: The touch panel plastic substrate uses a thermoplastic resin film as a base film at least one face of which has a hard coat layer. The hard coat layer of the hard coat layer laminated film has a pencil hardness of 2H or more under 1kg load as specified in JIS K 5400, and the hard coat layer laminated film has a light permeability of 70% or more under 400nm after 1000-hour exposure test as specified in JIS K 7350-4. When a transparent conductive layer is formed thereon, a resistance value change ratio (R/R<SB>0</SB>) of the transparent conductive layer before/after 100,000-time test of pen sliding resistance (load: 2.2N) is 1.5 or less. The touch panel uses the same. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a plastic substrate for a touch panel having excellent pen sliding resistance, weather resistance, and surface hardness, and a touch panel using the same.

  The transparent touch panel has a structure in which the electrode surfaces of two transparent electrode layers are opposed to each other, and a space between the electrodes has a structure of 10 μm or less on at least one of the electrode layers in order to prevent malfunction. It is held constant by a non-conductive spacer. For example, in the case of an analog touch panel, the electrode surfaces are brought into contact with each other by the pressure of a touch pen or a finger and are connected to detect the position.

  The structure of the transparent touch panel is generally composed of a plastic substrate / glass substrate and a glass substrate / glass substrate as the upper electrode / lower electrode. Most of the upper electrode is manufactured using a plastic substrate such as polyethylene terephthalate resin. When a glass substrate is used for the upper electrode, a considerably thin substrate is required. It is difficult to increase the size of glass substrates. From the merits such as weight reduction, thinning, damage prevention, and high productivity by roll-to-roll method, replacement of glass substrate with plastic substrate for both upper and lower electrodes is not possible. Progressing gradually.

  Thermoplastic resins are preferably used for transparent touch panels using plastic substrates, but generally plastic substrates made of thermoplastic resins can be used for polar solvents, etc. used in electrode patterning processes, bonding processes, etc. In many cases, the tolerance of is insufficient. Further, in order to obtain excellent pen sliding resistance, the pencil hardness of the plastic substrate is required to be 2H or more, and an appropriate hard coat layer needs to be laminated on one side or both sides of the plastic substrate.

  In addition, some thermoplastic resins have poor weather resistance depending on their chemical structure, and when used outdoors, the plastic substrate itself and the hard coat layer may deteriorate due to photochemical reaction due to long-term ultraviolet irradiation. Yellowing is a practical problem, and there is a demand for improved weather resistance.

  As a method for solving such a problem, conventionally, a hard coat agent containing an ultraviolet absorber in an acrylic, melamine, urethane, or silicon resin, monomer, or oligomer is applied to a plastic film and heated. Although a method of curing and laminating a hard coat layer has been proposed, there are problems such as low productivity, poor surface hardness, and short pot life of the hard coat agent. Therefore, in recent years, many studies have been conducted on ultraviolet curable hard coat agents having excellent productivity.

  However, in order to improve the weather resistance of the plastic substrate, it is necessary to cut the ultraviolet rays with the hard coat layer, so that the hard coat layer added with an ultraviolet absorber that inhibits ultraviolet curing must be cured with ultraviolet rays. There was a problem.

Therefore, an ultraviolet curable hard coating agent capable of imparting surface hardness and weather resistance to a plastic substrate has been studied, and polyfunctional urethane acrylate, polyfunctional acrylate, one (meth) acryloyloxy group per molecule. And a method using a mixture of an acrylate having a hydroxyl group, a cyclic ether bond and a chain ether bond in the molecule, colloidal silica, an ultraviolet absorber, a photoinitiator, and a solvent. (See Patent Document 1)
However, since this hard coating agent requires 1000mJ / cm2 of UV irradiation for curing, it impairs the transparency of the plastic substrate, and also contains silica particles. There was a problem that would occur.

JP-A-9-157315

  The object of the present invention is to solve the above-described problems of lowering transparency and pen-sliding resistance, and monomers or oligomers based on tri- or higher functional acrylates, photopolymerization initiators, ultraviolet absorbers. To provide a touch panel substrate having excellent pen sliding resistance, weather resistance, and surface hardness without using silica particles, and a touch panel using the same, by using a mixture of dilution solvents as a hard coat layer. is there.

That is, the present invention
(1) Using a thermoplastic resin film as a base film, having a hard coat layer on at least one surface thereof, and having a pencil hardness of 2H or more at a 1 kg load defined in JIS K 5400 of the hard coat layer of the hard coat layer laminated film When the light transmittance at 400 nm after the 1000-hour exposure test defined in JIS K 7350-4 of the coat layer laminated film is 70% or more and a transparent conductive layer is formed on the hard coat layer of the hard coat layer laminated film A plastic substrate for a touch panel, wherein the resistance change ratio (R / R ₀ ) before and after the 100,000 times test is 1.5 or less;
(2) The plastic substrate for a touch panel according to (1), wherein the thermoplastic resin is a polyethersulfone resin, a polycarbonate resin, a polysulfone resin, a cyclic polyolefin resin, or a polyethylene terephthalate resin,
(3) The plastic substrate for a touch panel according to (1) or (2), wherein the hard coat agent for forming the hard coat layer contains a monomer or oligomer containing acrylate as a main component, a photopolymerization initiator, and an ultraviolet absorber. ,
(4) A touch panel using the plastic substrate for a touch panel according to any one of (1) to (3),
It is.

  According to the present invention, the surface hardness, weather resistance, and pen sliding resistance of the plastic substrate for touch panel can be improved, and further, since a hard coat layer made of an ultraviolet curable resin is used, the productivity is excellent. It is possible to obtain a plastic substrate for a touch panel made of a hard coat layer laminated film that has little influence on transparency and is improved in quality.

  The plastic substrate for a touch panel of the present invention is obtained by laminating a hard coat layer on at least one surface of a base film made of a thermoplastic resin, and further laminating a transparent conductive layer thereon. The structure of the plastic substrate for a touch panel may be provided with various constituent layers on one side or both sides of the base film according to the purpose within a range not impairing the effects of the present invention. As various constituent layers, for example, a metal oxide layer can be laminated in order to improve the gas barrier property and improve the adhesion between the transparent conductive layer and the transparent plastic.

  The plastic substrate for a touch panel of the present invention is obtained by laminating a hard coat layer having an ultraviolet absorber, so that the hard coat layer laminated film is 70% or more at 400 nm even after the 1000 hour exposure test defined in JIS K 7350-4. It has the light transmittance of the following. When the light transmittance at the wavelength is less than 70%, the plastic substrate for touch panel is colored yellow, resulting in a problem that transparency is lowered and visibility is lowered.

The plastic substrate for a touch panel according to the present invention is a pen resistance of a transparent conductive layer when a transparent conductive layer is formed thereon by laminating a hard coat layer having a pencil hardness of 2H or more at a 1 kg load as defined in JIS K 5400. The slidability (load: 2.2N) is characterized in that the resistance value R ₀ before the 100,000 test test and the ratio (R / R ₀ ) of the resistance value R after the test are 1.5 or less. When the change ratio (R / R ₀ ) of the resistance value before the pen slidability test exceeds 1.5, there is a problem that it is difficult to accurately detect the position, and it cannot be used in actual use.

  The resin of the base film used in the present invention is a thermoplastic resin, and examples thereof include polyethersulfone resin, polysulfone resin, polycarbonate resin, cyclic polyolefin resin, and polyethylene terephthalate resin. These films may be appropriately blended with a lubricant, a heat stabilizer, a weather stabilizer, a pigment, a dye, an inorganic filler, and the like. In applications where high pen slidability is required, it is preferable that the transparent conductive layer has a glass transition temperature of 150 ° C. or higher that facilitates crystallization. A polyethersulfone resin having a good balance between properties and impact resistance is particularly preferred.

  Although the thickness of the base film used for this invention is not specifically limited, Preferably it is 50-500 micrometers, More preferably, it is 100-400 micrometers.

  The acrylate as the main component of the hard coat agent used in the present invention is not particularly limited, but a resin that can withstand the temperature at the time of laminating the transparent conductive layer and maintain the transparency is preferable, and the glass transition temperature of the cured product is 150. It is preferable that the temperature is at least ° C. In addition to the mechanical properties and transparency after curing, chemical resistance, and heat resistance, as well as various physical properties such as low viscosity during coating processing, specifically, more than three functionalities that can be expected to achieve three-dimensional crosslinking An ultraviolet curable resin obtained by crosslinking a monomer or oligomer containing acrylate as a main component is preferable. Trifunctional or higher acrylates include trimethylolpropane triacrylate, isocyanuric acid EO-modified triacrylate, pentaerythritol triacrylate, dipentaerythritol triacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, Ditrimethylolpropane tetraacrylate, pentaerythritol tetraacrylate, polyester acrylate and the like are preferable, but isocyanuric acid EO-modified triacrylate and polyester acrylate are particularly preferable. These may be used alone or in combination of two or more. In addition to these tri- or higher functional acrylates, so-called acrylic resins such as epoxy acrylate and urethane acrylate can be used in combination. These resins are preferably those that can be cured within 5 minutes in consideration of industrial production regardless of which coating method is used.

  Examples of the ultraviolet absorber are not particularly limited, and also include light stabilizers for polymers such as hindered amines. From the viewpoint of good solubility in acrylate of the main component of the hard coat layer of the present invention and improvement in weather resistance of the plastic substrate, benzophenone, benzotriazole, phenyl salicylate, phenyl benzoate, and cyanoacrylate derivatives It is preferable that the maximum absorption wavelength is in the range of 250 to 400 nm.

  Specific examples of the ultraviolet absorber used in the present invention include 2-hydroxybenzophenone, 5-chloro-2-hydroxybenzophenone, 2,4-dihydroxybenzoenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-acetoxy. Ethoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2-hydroxy-4-iso-octoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2-hydroxy-4-acryloxybenzophenone 2,2 ′, 4,4′-tetrahydroxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-hydroxy-4-octadecyloxybenzophenone, 2-2′-dihydroxy-4-methoxybenzophenone, 2-2′- The Droxy-4,4′dimethoxybenzophenone, 2- (2′-hydroxy-5′methylphenyl) -benzotriazole, 2- (2′-hydroxy-5′-tert-octylphenyl) -benzotriazole, 2- (2 '-Hydroxy-3'-t-butyl-5'-methylphenyl) 5-chlorobenzotriazole, 2- (2'-hydroxy-3', 5'-di-tert-amylphenyl) -benzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-tert-butylphenyl) -5 Benzotriazole, 2- {2′-hydroxy-3 ′, 5′-di (1,1-dimethylbenzyl) phenyl} -2H-benzotriazole, 2- (2H-benzotria 2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol, 2- {5-chloro (2H) -benzotriazol-2-yl} -4-methyl-6- ( tert-butyl) phenol, 2- (2′-hydroxy-5′-methacryloxyphenyl) -2H-benzotriazole, phenyl salicylate, p-tert-butylphenyl salicylate, p-octylphenyl salicylate, and the like. These ultraviolet absorbers may be used alone or in combination of two or more.

  The addition amount of the ultraviolet absorber is preferably 0.5 to 10 parts by weight, more preferably 1 to 5 parts by weight with respect to 100 parts by weight of the main component acrylate. When the addition amount is less than the lower limit, the weather resistance of the hard coat layer laminated film is lowered, and when the upper limit is exceeded, the hard coat layer is not sufficiently cured, the surface hardness and the base film and the hard coat layer It is impossible to obtain sufficient adhesion.

  The photopolymerization initiator used in the present invention is not particularly limited. Specific examples include 2,4,6-trimethylbenzoylphenylphosphine oxycide, benzoin isopropyl ether, benzoin methyl ether, benzoin ethyl ether, 1-hydroxycyclohexyl phenyl ketone, 2,2-dimethoxy-2-phenylacetophenone, 2-methyl. -[4- (methylthio) phenyl] -2-morpholino-1-propanone, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butan-1-one, 2-hydroxy-2-methyl Examples include -1-phenylpropan-1-one, benzophenone, and 2-hydroxy-2-methyl-1-phenylpropan-1-one. These photopolymerization initiators may be used alone or in combination of two or more.

  The addition amount of the photopolymerization initiator is 0.1 to 5 parts by weight, preferably 0.5 to 3 parts by weight, based on the main component acrylate. Less than the lower limit is not preferable because the hard coat layer is insufficiently cured. Moreover, when exceeding an upper limit, since yellowing of a hard-coat layer will be produced or a weather resistance will fall, it is unpreferable.

  The solvent is not particularly limited as long as it dissolves the main component acrylate. Specifically, ethanol, isopropyl alcohol, isobutyl alcohol, benzene, toluene, xylene, acetone, methyl ethyl ketone, methyl isobutyl ketone, ethyl acetate, n-butyl acetate, isoamyl acetate, ethyl lactate, methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl Examples include cellosolve acetate and propylene glycol monomethyl ether acetate. These solvents may be used alone or in combination of two or more.

  The addition amount of the solvent is 30 to 400 parts by weight with respect to 100 parts by weight of the mixture of the acrylate component, the ultraviolet absorber and the photopolymerization initiator. If it is less than the lower limit, the hard coat layer cannot be uniformly laminated, which is not preferable. On the other hand, it is not preferable that the upper limit is exceeded because the film thickness of the hard coat layer is reduced and the surface hardness is lowered.

The coating amount of the hard coat agent of the present invention is preferably such that the film thickness of the cured coating is in the range of 1 to 20 μm. If the film thickness is less than the lower limit, sufficient surface hardness cannot be obtained, and if it exceeds the upper limit, curing is insufficient, cracks are formed in the cured film, and the appearance and transparency are unfavorable.

  The hard coat layer of the present invention can be applied using a known method such as a gravure coating method or a kiss coating method.

  Regarding the ultraviolet irradiation for curing the hard coat layer of the present invention, light having a necessary wavelength may be selectively irradiated. Specifically, a method of irradiating from the surface opposite to the side on which the coating film of the film is formed, or providing a selective transmission filter in the irradiation part can be mentioned. Further, when the curing reaction of the hard coat agent is inhibited by oxygen in the atmosphere, irradiation may be performed in an inert gas atmosphere such as nitrogen. In the case of selectively irradiating a wavelength of 365 nm or 254 nm with an ultraviolet irradiation amount, the irradiation amount in the wavelength region that is the maximum irradiation amount in the ultraviolet region may be measured by an ultraviolet illuminometer.

  Examples of the method for laminating the transparent conductive layer on the hard coat layer laminated film of the present invention include, but are not particularly limited to, a sputtering method, a vacuum deposition method, an ion plating method, and a CDV method.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated further in detail, these are only illustrations and this invention is not limited to these Examples at all.

<Example 1>
A polyethersulfone film having a thickness of 200 μm formed by a melt extrusion method was used as a base film. This base film was subjected to the following processing using a production apparatus having an unwinding device, a coater unit, a heat drying zone, a high-pressure mercury lamp, and a winding device. As hard coating agent, isocyanuric acid EO-modified triacrylate 100 parts by weight, and as UV absorber, 2- (2′-hydroxy-5′-methylphenyl) -benzotriazole 1 part by weight, 2-hydroxy-4-methoxy -0.5 part by weight of benzophenone, 0.5 part by weight of bis (2,2,6,6-tetramethyl-4-piperidyl) -sebacate, 2,2-dimethoxy-1,2-diphenylethane as a photopolymerization initiator A mixed solution of 2 parts by weight of -1-one and 200 parts by weight of butyl acetate was used. This mixed solution was applied by a gravure coating method, heated at 120 ° C. for 5 minutes to remove the solvent, and then irradiated with ultraviolet rays at 350 mJ / cm 2 using a high pressure mercury lamp to form a 10 μm thick hard coat layer. Table 1 shows the evaluation results of the appearance, surface hardness, adhesion, and weather resistance of the obtained hard coat layer laminated film. Next, an initial vacuum degree of 3 × 10 ⁻⁴ Pa is drawn on the hard coat layer by a DC magnetron method, a mixed gas of oxygen / argon gas 4% is introduced, and a film is formed under conditions of 1 × 10 ⁻¹ Pa. An oxide transparent electrode thin film made of In ₂ O ₅ and SnO ₂ having an In / In + Sn atomic ratio of 0.98 was stacked. The surface resistance (Ro) was 300Ω / □ and the film thickness was 30 mm. Table 1 shows the evaluation results of the pen sliding resistance of the plastic substrate for touch panel thus obtained.

<Example 2>
As a hard coating agent, 80 parts by weight of trimethylolpropane triacrylate, 20 parts by weight of polyester acrylate, 2, 2-dimethoxy-1, 2-diphenylethane-1-one as 2 parts by weight of a photopolymerization initiator, and as an ultraviolet absorber, 2- (2′-hydroxy-5′-tert-octylphenyl) -benzotriazole 1.5 parts by weight, 2-hydroxybenzophenone 1 part by weight, bis (2,2,6,6-tetramethyl-4-piperidyl) -sebacate A hard coat layer was laminated in the same manner as in Example 1 except that a mixed solution of 0.5 parts by weight and 200 parts by weight of butyl acetate was used. Table 1 shows the evaluation results of the appearance, surface hardness, adhesion, and weather resistance of the obtained hard coat layer laminated film. Next, an oxide transparent electrode thin film made of In ₂ O ₅ and SnO ₂ having an In / In + Sn atomic ratio of 0.98 was laminated on the hard coat layer in the same manner as in Example 1. The surface resistance (Ro) was 300Ω / □ and the film thickness was 30 mm. Table 1 shows the evaluation results of the pen sliding resistance of the plastic substrate for a touch panel thus obtained.

<Example 3>
A hard coat layer was laminated in the same manner as in Example 1 except that a 200 μm-thick polycarbonate film formed by a melt extrusion method was used as the base film. Table 1 shows the evaluation results of the appearance, surface hardness, adhesion, and weather resistance of the obtained hard coat layer laminated film. Next, an oxide transparent electrode thin film made of In ₂ O ₅ and SnO ₂ having an In / In + Sn atomic ratio of 0.98 was laminated on the hard coat layer in the same manner as in Example 1. The surface resistance (Ro) was 310Ω / □ and the film thickness was 30 mm. Table 1 shows the evaluation results of the pen sliding resistance of the plastic substrate for touch panel thus obtained.

<Comparative Example 1>
As a hard coating agent, a mixed solution of 100 parts by weight of isocyanuric acid EO-modified triacrylate, 2, 2-dimethoxy-1,2-diphenylethane-1-one as a photopolymerization initiator, and 200 parts by weight of butyl acetate is used. A hard coat layer was laminated in the same manner as in Example 1 except that. Table 1 shows the evaluation results of the appearance, surface hardness, adhesion, and weather resistance of the obtained hard coat layer laminated film. Next, an oxide transparent electrode thin film made of In ₂ O ₅ and SnO ₂ having an In / In + Sn atomic ratio of 0.98 was laminated on the hard coat layer in the same manner as in Example 1. The surface resistance (Ro) was 300Ω / □, and the film thickness was 30 mm. Table 1 shows the evaluation results of the pen sliding resistance of the plastic substrate for touch panel thus obtained.

<Comparative example 2>
As hard coating agent, isocyanuric acid EO-modified triacrylate 100 parts by weight, as photopolymerization initiator 2,2-dimethoxy-1,2-diphenylethane-1-one 2 parts by weight, as ultraviolet absorber 2- (2 ′ -Hydroxy-5'-methylphenyl) -benzotriazole 1 part by weight, 2-hydroxy-4-methoxy-benzophenone 0.5 part by weight, bis (2,2,6,6-tetramethyl-4-piperidyl) A hard coat layer was laminated in the same manner as in Example 1 except that a mixed solution of 0.5 parts by weight of sebacate, 10 parts by weight of silica particles having a particle diameter of 80 nm, and 200 parts by weight of butyl acetate was used. Table 1 shows the evaluation results of the appearance, surface hardness, adhesion, and weather resistance of the obtained hard coat layer laminated film. Next, an oxide transparent electrode thin film made of In ₂ O ₅ and SnO ₂ having an In / In + Sn atomic ratio of 0.98 was laminated on the hard coat layer in the same manner as in Example 1. The surface resistance (Ro) was 305Ω / □, and the film thickness was 30 mm. Table 1 shows the evaluation results of the pen sliding resistance of the plastic substrate for touch panel thus obtained.

<Comparative Example 3>
As hard coating agent, 100 parts by weight of 2-ethylhexyl acrylate, 2, 2-dimethoxy-1,2-diphenylethane-1-one as photopolymerization initiator, 2 parts by weight as UV absorber, 2- (2 ′ -Hydroxy-5'-methylphenyl) -benzotriazole 1 part by weight, 2-hydroxy-4-methoxy-benzophenone 0.5 part by weight, bis (2,2,6,6-tetramethyl-4-piperidyl) -A hard coat layer was laminated in the same manner as in Example 1 except that a mixed solution of 0.5 parts by weight of sebacate and 200 parts by weight of butyl acetate was used. Table 1 shows the evaluation results of the appearance, surface hardness, adhesion, and weather resistance of the obtained hard coat layer laminated film. Next, an oxide transparent electrode thin film made of In ₂ O ₅ and SnO ₂ having an In / In + Sn atomic ratio of 0.98 was laminated on the hard coat layer in the same manner as in Example 1. The surface resistance (Ro) was 305Ω / □, and the film thickness was 30 mm. Table 1 shows the evaluation results of the pen sliding resistance of the plastic substrate for touch panel thus obtained.

The evaluation method and criteria are described in the following (a) to (e).
(a) About the external appearance, the thermoplastic resin film surface after hard-coat layer lamination | stacking was confirmed visually.
Those with whitening and coating repelling were judged to be defective.
(b) The adhesion between the hard coat layer and the base film was evaluated by a cross-cut peel test in accordance with JIS-K5400. The test result indicates the number of remaining eyes without peeling in 100 grids in%.
When the ratio of the remaining eyes was less than 95%, it was judged as defective.
(c) The surface hardness of the hard coat layer was evaluated at a 1 kg load by the method defined in JIS-K5400. After the test was conducted 5 times, the surface was visually checked for scratches.
A case where 3 or more scratches were present was judged as defective.
(d) The weather resistance of the hard coat layer laminated film was tested using the method defined in JIS-K7350-4. Test conditions were an accelerated exposure test for 1000 hours at a black panel temperature of 63 ° C. and an irradiation intensity of 500 W, and the adhesion between the hard coat layer and the base film of the final exposed sample was evaluated by the method defined in JIS-K5400. Further, the light transmittance at 400 nm of the hard coat layer laminated film was evaluated by the method defined in JIS-K7361.
When the light transmittance at 400 nm after the accelerated exposure test was 70% or less, it was judged as defective.
(e) For pen slidability, the produced plastic substrate was a pen plotter FP8300 (manufactured by Graphtec), and the top surface of this substrate was a polyacetal pen with a tip of 0.8 mm, a load of 2.2 N, linear After sliding 100,000 times, the resistance change was evaluated by the method defined in JIS K7194 within the range crossing the slid line.
1.5 or less was considered good.

  According to the present invention, the surface hardness, weather resistance, and pen sliding resistance of the plastic substrate for touch panel can be improved, and further, since a hard coat layer made of an ultraviolet curable resin is used, the productivity is excellent. It is possible to obtain a plastic substrate for a touch panel made of a hard coat layer laminated film that has little influence on transparency and is improved in quality.

Claims (4)

A thermoplastic resin film is used as a base film, and a hard coat layer is provided on at least one surface thereof. The hard coat layer of the hard coat layer laminate film has a pencil hardness of 2H or more at a 1 kg load as defined in JIS K 5400, and a hard coat layer laminate. Transparent conductive layer when light transmittance at 400 nm after exposure test for 1000 hours defined in JIS K 7350-4 of the film is 70% or more and a transparent conductive layer is formed on the hard coat layer of the hard coat layer laminated film A plastic substrate for a touch panel, wherein a resistance change ratio (R / R ₀ ) before and after a 100,000 times test is 1.5 or less.   The touch panel plastic substrate according to claim 1, wherein the thermoplastic resin is a polyether sulfone resin, a polycarbonate resin, a polysulfone resin, a cyclic polyolefin resin, or a polyethylene terephthalate resin.   The plastic substrate for a touch panel according to claim 1 or 2, wherein the hard coat agent forming the hard coat layer contains a monomer or an oligomer mainly composed of acrylate, a photopolymerization initiator, and an ultraviolet absorber.   The touch panel using the plastic substrate for touch panels in any one of Claims 1-3.