JP4777008B2 - Conductive laminated film, electrode plate for touch panel and touch panel - Google Patents

Description

  The present invention relates to a conductive laminated film in which two transparent substrates are laminated via an adhesive layer and has a hard coat layer. The present invention also relates to an electrode plate for a touch panel using the conductive laminated film. Furthermore, this invention relates to the touchscreen using the said electrode plate for touchscreens.

  Of various types of touch panels, those that are used in combination with a liquid crystal display are used to achieve thinning and power saving, so a resistive touch panel is often used. Yes. Generally, there are a matrix type and an analog type in the resistive touch panel, and they are properly used depending on the purpose. In the matrix system, strip electrodes are formed in a direction intersecting with each other between a pressing side (input operation side) substrate and a non-pressing side (display side) substrate, and are arranged to face each other via a spacer.

  On the other hand, the analog touch panel is arranged so that the transparent conductive thin film of the conductive film is on the inside, with a spacer interposed therebetween, and a current is passed through one of the transparent conductive thin films to measure the voltage in the other transparent conductive thin film. Then, the opposing transparent conductive thin films are brought into contact with each other through a pressing operation with a finger, a pen, or the like, and the position is detected by the flow of current at the contact portion. Usually, a lead made of a conductive paste such as a silver paste is provided at the end of the transparent conductive thin film for energization. The lead is formed by, for example, a method in which the conductive paste interposed between the transparent conductive thin films is heated at 100 to 150 ° C. for 1 to 2 hours and cured while keeping the surface of the conductive film facing the flat surface. It is formed.

  In addition, as a conductive film, a transparent conductive thin film is provided on one side of a transparent substrate so that it can withstand scratch resistance and hitting characteristics at the time of pressing operation. A conductive laminated film in which a transparent substrate (hard coat film) having a hard coat layer on the surface is bonded is proposed (Patent Document 1).

  However, the conductive laminated film has a problem of curling during the heat treatment, and the curl causes a Newton ring on the touch panel, which causes poor screen visibility. Therefore, in order to prevent such curling of the conductive laminated film, the difference in thermal shrinkage between the hard coat layer and the transparent substrate is 0.35% for the hard coat film in the conductive laminated film. It is proposed to control within a narrow range (Patent Document 2). Patent Document 2 discloses that, from the viewpoint of curling prevention, it is preferable that the difference in thermal shrinkage between the conductive film and the hard coat film is reduced to within 0.3%.

The conductive laminated film described in Patent Document 2 can suppress the occurrence of curling during heat processing. However, as in Patent Document 2, even if the thermal shrinkage rate of each film is controlled, depending on the use mode of the conductive laminated film, there are cases where streaks are generated when the transparent conductive thin film is observed. There were things that impair the appearance characteristics.
Japanese Patent No. 2667686 JP 2002-73282 A

  In the present invention, a transparent base material (hard coat film) having a hard coat layer on the outer surface is bonded via an adhesive layer to a conductive film having a transparent conductive thin film on one surface of a transparent base material. An object of the present invention is to provide a conductive laminated film which can suppress the occurrence of curling during heat processing and has good appearance characteristics without generation of streaks.

  Moreover, this invention aims at providing the electrode plate for touchscreens using the said electroconductive laminated film, and also providing the touchscreen using the said electrode plate for touchscreens.

  As a result of intensive studies to solve the above problems, the present inventors have found that the object can be achieved by the conductive laminated film shown below, and have completed the present invention.

That is, the present invention has a hard coat film in which a hard coat layer is formed on the first surface of the first transparent substrate, and a transparent conductive thin film on the first surface of the second transparent substrate via one anchor layer. The conductive laminated film is disposed such that the second surface of the first transparent substrate and the second surface of the second transparent substrate are opposed to each other, and bonded via an adhesive layer,
Both the first transparent substrate and the second transparent substrate are biaxially stretched films,
Difference between longitudinal heat shrinkage (S1) based on the second transparent substrate in the conductive film and longitudinal heat shrinkage (S3) based on the second transparent substrate in the conductive laminated film It is related with the electroconductive laminated film characterized by (S1-S3) being in the range of -0.10 to 0.25%.

  In the conductive laminated film, when the conductive film has a transparent conductive thin film on the first surface of the second transparent substrate via one anchor layer, streaks are likely to occur. The present invention is useful for conductive laminated films.

  Further, the conductive laminated film of the present invention is likely to cause streaks when the transparent conductive thin film of the conductive film is an amorphous layer, and the present invention is useful for the conductive laminated film of such an embodiment. .

  Moreover, this invention relates to the electrode plate for touchscreens using the said electroconductive laminated film.

  Further, the present invention provides a touch panel in which a pair of electrode plates for a touch panel having a transparent conductive thin film are arranged to face each other with a spacer so that the transparent conductive thin films are opposed to each other. It is related with the touch panel characterized by being the said electrode plate for touch panels.

  In the present invention, the occurrence of streaks resulting from poor appearance in the conductive laminated film is affected by the thermal contraction rate of the biaxially stretched film as the first transparent substrate and the second transparent substrate. I thought it was. In addition, the biaxially stretched film has a larger stretching ratio in the longitudinal direction (film flow direction: MD direction) than the stretching ratio in the lateral direction (film width direction: TD direction). The vertical direction is larger than the horizontal direction. Therefore, attention was focused on the heat shrinkage rate in the vertical direction based on these first transparent substrate and second transparent substrate.

  On the other hand, from the viewpoint of suppressing the curling of the conductive laminated film, as in Patent Document 2, the difference in thermal shrinkage between the hard coat film and the conductive film constituting the conductive laminated film is reduced. However, the occurrence of streaks that occur as poor appearance in the conductive laminated film may not be controlled only by reducing the difference in thermal shrinkage between the hard coat film and the conductive film.

  In addition, streaks that occur in the conductive laminated film are often recognized when the conductive film has a transparent conductive thin film on the first surface of the second transparent substrate via one anchor layer. Further, the streaks generated in the conductive laminated film are often recognized when the transparent conductive thin film is an amorphous layer. In particular, when a conductive film having a transparent conductive thin film of an amorphous layer through a single anchor layer is used on the first surface of the second transparent substrate, streaks are noticeable. It is done.

  From these examination results, the streaks generated in the conductive laminated film are caused by the heat shrinkage rate in the longitudinal direction of the biaxially stretched film, and the heat shrinkage rate affecting the streaks is determined by the final product. The heat shrinkage rate of the conductive laminated film is important, streaks are affected by the anchor layer of the conductive film, and the crystallinity of the transparent conductive thin film is also affected. Therefore, the heat shrinkage rate in the vertical direction based on the second transparent substrate in the conductive film (S1) and the heat shrinkage rate in the vertical direction based on the second transparent substrate in the conductive laminated film (S3) ), And the heat shrinkage rate (S3) of the conductive laminated film is controlled so as not to significantly exceed the heat shrinkage rate (S1) of the conductive film. The difference (S1-S3) It was controlled to be (-0.1～0.25%). That is, the conductive laminated film of the present invention is one in which the difference (S1−S3) is controlled within the above range to suppress the occurrence of curling and the generation of streaks.

  If the value of the difference (S1-S3) is less than -0.10%, the heat shrinkage rate of the conductive laminated film is too large compared to the heat shrinkage rate of the conductive film, and streaks are generated. The characteristics are damaged. On the other hand, if it exceeds 0.25%, there is no particular problem with the generation of streaks, but it is not preferable for suppressing the occurrence of curling. From this viewpoint, the value of the difference (S1-S3) is preferably in the range of -0.05 to 0.2%, and more preferably in the range of 0 to 0.2%.

  In addition, since the heat shrinkage rate (S3) of the conductive laminated film of the present invention is not preferable in terms of curling, the heat shrinkage rate (S3) is preferably about 0 to 0.8%. More preferably, it is 0.2 to 0.6%. Moreover, also about an electroconductive film, it is preferable that the said heat shrinkage rate (S1) is about 0.1 to 0.9%, More preferably, it is 0.3 to 0.7% from the same viewpoint. Moreover, also about a hard coat film, it is preferable from the same viewpoint that the thermal contraction rate (S2) of the vertical direction on the basis of a 1st transparent base material is about 0.1 to 0.8%, More preferably 0.2 to 0.6%. These heat shrinkage rates are values measured by the method described in the examples.

  Hereinafter, the conductive laminated film of the present invention will be described with reference to FIG. As shown in FIG. 1, the conductive laminated film has a conductive film 1 composed of a second transparent base material 12 provided with a transparent conductive thin film 11 on one side, a pressure-sensitive adhesive layer 2, and one side of a first transparent base material 31. The hard coat film 3 provided with the hard coat layer 32 is provided, and the other surface of the second transparent substrate 12 and the other surface of the first transparent substrate 31 are bonded with the pressure-sensitive adhesive layer 2. In the electroconductive film 1 of FIG. 1, it is an example in case the transparent conductive thin film 11 is provided in the 2nd transparent base material 12 via the anchor layer 13. FIG.

  As the first transparent substrate in the hard coat film and the second transparent substrate in the conductive film, a biaxially stretched film is used. Examples of the material of the biaxially stretched film used as the transparent base material include appropriate plastics such as polyester resins, polyamide resins, polyvinyl chloride resins, polystyrene resins, and olefin resins such as polyethylene and polypropylene. Is used. Of these, polyester resins, particularly polyethylene terephthalate are preferred.

  Although the film thickness of a 1st transparent base material and a 2nd transparent base material can be determined suitably, generally it is about 3-300 micrometers suitably from points, such as workability | operativity and a performance at the time of touch panel formation, Furthermore, 5- 250 μm, particularly 10 to 200 μm is preferable.

  Moreover, it is preferable to select each so that the film thickness of a 1st transparent base material may become thicker than the film thickness of a 2nd transparent base material. Usually, the film thickness of the first transparent substrate is about 50 to 300 μm, preferably 75 to 200 μm, and the film thickness of the second transparent substrate is about 3 to 100 μm, preferably 10 to 50 μm, and these ranges. Thus, it is preferable to select the film thickness of the first transparent substrate so as to be larger than the film thickness of the second transparent substrate.

  The conductive film can be obtained by providing a transparent conductive thin film on one side of a biaxially stretched film serving as a second transparent substrate. For the formation of the transparent conductive thin film, various thin film forming methods such as a vacuum deposition method, a sputtering method, an ion plating method, a spray pyrolysis method, a chemical plating method, an electroplating method or a combination thereof are appropriately selected. It can be performed by attaching a film made of a transparent conductive thin film forming material on the film of the second transparent substrate. From the viewpoint of the formation rate of the transparent conductive thin film, the formation property of the large area film, the productivity, etc., it is preferable to employ a vacuum deposition method or a sputtering method as the thin film formation method.

  As a material for forming the transparent conductive thin film, a material capable of forming a transparent conductive film is appropriately selected and used. Preferably, for example, a metal made of gold, silver, platinum, palladium, copper, aluminum, nickel, chromium, titanium, iron, cobalt, tin and alloys thereof, indium oxide, tin oxide, titanium oxide, cadmium oxide and A metal oxide made of a mixture of these or other metal compounds made of copper iodide or the like is used.

  The conductive laminated film of the present invention is suitably applied when the transparent conductive thin film is an amorphous layer. When the transparent conductive thin film does not have a crystal, the present invention is effective against streaks because the transparent conductive thin film has no rigidity. Whether the transparent conductive thin film is a crystalline layer or an amorphous layer is determined by observing the surface of the transparent conductive thin film with a field emission transmission electron microscope (FE-TEM). The non-crystalline layer refers to a layer in which a polygonal or oval crystal is not observed on the entire surface. However, not being observed on the entire surface is a concept including a case where crystals are present in 50% by area or less of the entire surface. Preferably it is the case of 0-30 area%.

The thickness of the transparent conductive thin film can be appropriately determined according to the purpose of use. The thickness is usually 10 to 300 nm, preferably 10 to 200 nm. If the thickness is less than 10 nm, it is difficult to form a continuous film having good electrical conductivity with a surface electrical resistance of 10 ³ Ω / □ or less, and if it is too thick, the transparency tends to decrease.

  One anchor layer is provided between the second transparent substrate and the transparent conductive thin film. The anchor layer is formed of an inorganic material, an organic material, or a mixture of an inorganic material and an organic material. The formation of the anchor layer improves the adhesion between the second transparent substrate and the transparent conductive thin film, improves the scratch resistance and flex resistance of the transparent conductive thin film, and improves the spot characteristics for touch panels. It is valid. Such an anchor layer is preferably an organic material. In a conductive laminated film using a conductive film provided with an anchor layer, streaks are likely to occur. Even when such an anchor layer is used, the conductive laminated film of the present invention can suppress the occurrence of streaks. it can. In particular, when the anchor layer is one layer, the conductive laminated film of the present invention is useful.

As the inorganic material for forming the anchor layer, for example, SiO ₂ , MgF ₂ , A1 ₂ O ₃ or the like is preferably used as an inorganic material. Examples of organic substances include organic substances such as acrylic resins, urethane resins, melamine resins, alkyd resins, and siloxane polymers. In particular, as the organic substance, it is desirable to use a thermosetting resin made of a mixture of a melamine resin, an alkyd resin, and an organosilane condensate.

  The anchor layer can be formed using the above materials by vacuum deposition, sputtering, ion plating, coating, or the like.

  The thickness of the anchor layer is usually about 15 to 100 nm, preferably 20 to 60 nm.

  In addition, when attaching the transparent conductive thin film, the film surface of the second transparent substrate is subjected to appropriate adhesion treatment such as corona discharge treatment, ultraviolet irradiation treatment, plasma treatment, sputter etching treatment, etc. Adhesion can also be increased.

  A hard coat film is obtained by carrying out the hard coat process of the single side | surface of the biaxially stretched film used as a 1st transparent base material, and forming a hard coat layer. The hard coat treatment can be performed, for example, by a method of applying a hard resin such as an acrylic urethane resin or a siloxane resin and performing a curing treatment. In the hard coat treatment, the surface can be roughened by blending a silicone resin or the like with a hard resin such as acrylic urethane resin or siloxane resin to prevent reflection due to mirror action when used as a touch panel or the like. A non-glare surface can be formed simultaneously.

  When forming the hard coat layer, if the thickness is small, the hardness is insufficient, while if it is too thick, cracks may occur. In consideration of curling prevention characteristics and the like, the preferred thickness of the hard coat layer is preferably about 0.1 to 30 μm.

  The conductive laminated film of the present invention is obtained by laminating a conductive laminated film and a hard coat film with an adhesive layer. As described above, the heat shrinkage rate (S3) of the conductive laminated film is as follows. The heat shrinkage rate (S1) of the conductive film is controlled so as not to greatly exceed. The heat shrinkage rate and the heat shrinkage rate difference of the conductive film and the hard coat film are controlled so as to satisfy the above values by selecting their constituent materials and / or adjusting their thicknesses. In pasting, the conductive laminated film and the hard coat film are preferably performed so that the longitudinal directions of the biaxially stretched films used for the respective transparent substrates are aligned. Moreover, a hard coat film and a conductive film can also be adjusted so that it may become the said thermal contraction rate by performing a low thermal contraction process.

  As the pressure-sensitive adhesive layer for adhering the hard coat film and the conductive film in the conductive laminated film of the present invention, one having transparency is appropriately selected and used.

The pressure-sensitive adhesive layer only needs to have transparency, and for example, an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, or the like is used. The pressure-sensitive adhesive layer has a function of improving the scratch resistance of the transparent conductive thin film provided on one surface of the film substrate and the hitting characteristics for a touch panel by the cushion effect after the transparent substrate is bonded. In order to perform this function better, it is desirable to set the elastic modulus of the pressure-sensitive adhesive layer in the range of 1 to 100 N / cm ² and the thickness in the range of 1 μm or more, usually 5 to 500 μm, preferably 5 to 10 μm. The method for forming the pressure-sensitive adhesive layer is not particularly limited, and can be provided in an appropriate manner at an appropriate stage. For example, it may be attached to a hard coat film and / or a conductive film in advance and used for adhesion of both films, or may be applied during the adhesion lamination.

When the elastic modulus of the pressure-sensitive adhesive layer is less than 1 N / cm ² , the pressure-sensitive adhesive layer becomes inelastic, so that it is easily deformed by pressurization, causing irregularities in the film substrate and thus the transparent conductive thin film, and processing cutting. The adhesive is likely to protrude from the surface, and the effect of improving the scratch resistance of the transparent conductive thin film and the dot characteristics as a touch panel is reduced. On the other hand, if it exceeds 100 N / cm ² , the pressure-sensitive adhesive layer becomes hard and the cushioning effect cannot be expected, and the scratch resistance of the transparent conductive thin film and the dot characteristics as a touch panel cannot be improved.

  When the thickness of the pressure-sensitive adhesive layer is less than 1 μm, the cushioning effect cannot be expected, so that it is not possible to expect the scratch resistance of the transparent conductive thin film and the improvement of the dot characteristics as a touch panel. On the other hand, if the pressure-sensitive adhesive layer is too thick, the transparency is impaired, and it is difficult to obtain good results in terms of formation of the pressure-sensitive adhesive layer, bonding workability of the transparent substrate, and cost.

  The conductive laminated film of the present invention can be preferably used for forming various devices such as a touch panel and a liquid crystal display. In particular, since it has a hard coat treatment, it can be preferably used for parts or parts that come into contact with the outside, such as touch panels.

  FIG. 2 shows an example of a touch panel using the conductive laminated film of the present invention. That is, the spacers s are arranged so that the transparent conductive thin films 11a and 11b provided so that the pair of panel plates (touch panel electrode plates) P1 and P2 having the transparent conductive thin films 11a and 11b are orthogonal to each other. In the touch panel formed so as to face each other, the above-described conductive laminated film shown in FIG. 1 is used as one panel plate P1.

  In this touch panel, the transparent conductive thin films 11a and 11b come into contact with each other when the pressing point is pressed with the input pen M from the panel board P1, and the electric circuit is turned on. It functions as a transparent switch horizontal body that returns to the state. In that case, since the panel board P1 consists of said electroconductive laminated | multilayer film, generation | occurrence | production of a streak can be suppressed in a transparent conductive thin film.

  In FIG. 2, the panel plate P2 is obtained by providing the transparent base 4 made of a plastic film, a glass plate, or the like with the transparent conductive thin film 11b, but is similar to the panel plate P1 shown in FIG. A conductive laminated film may be used.

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

(Measurement of heat shrinkage)
The heat shrinkage rate of the hard coat film, conductive film, and conductive laminated film was measured for a 10 cm square sample by measuring the dimensions in the initial state and the dimensions when left at 150 ° C. for 1 hour (dimensions after standing). The measured value was determined by substituting into the following formula. The dimensions were measured using an Olympus digital compact microscope (STM5). The thermal shrinkage was measured in the longitudinal direction (film flow direction: MD direction) of the biaxially stretched film used as the first transparent substrate or the second transparent substrate.
Thermal contraction rate (%) = {(initial dimension−dimension after standing) / (initial dimension)} × 100

(Creation of conductive film)
A polyethylene terephthalate film (Teijin DuPont, product number F13) having a thickness of 25 μm and a width of 1000 mm is prepared as a second transparent substrate, and the thickness is made of one side with a siloxane-based resin (Toshiba Silicone, Si coating 801). After providing a 40 nm anchor layer, a conductive film having an ITO vapor deposition film (thickness 20 nm) as a transparent conductive thin film was prepared. The ITO vapor-deposited film was amorphous (the ratio of crystals was 0 area%).

  In order to adjust the heat shrinkage rate of the obtained conductive film, the conductive film was passed through a roll-to-roll hot air drying oven (oven temperature 130 ° C.) at 10 m / min. At that time, three kinds of films C1, C2, and C3 having different thermal shrinkage rates are obtained by adjusting the tension in the oven in three stages (low: 60N, medium: 100N, high: 140N). It was. Each film was cut out as a sample (10 cm × 10 cm) so as to be divided into three equal parts in the width direction. About the film C1, it was set as C-M1, C-B1, and C-C1 from the right side. The same applies to the films C2 and C3. Table 1 shows the thermal shrinkage of each conductive film.

(Creation of hard coat film)
A polyethylene terephthalate film (Teijin DuPont, product number F17) having a thickness of 125 μm and a width of 1000 mm was prepared as a first transparent substrate, and an acrylic urethane resin (trade name “Uni Unik Chemical Co., Ltd.” Dick 17-806 ") 5 parts of hydroxycyclohexyl phenyl ketone (trade name" Irgacure 184 "manufactured by Ciba Specialty Chemicals) as a photopolymerization initiator is added to 100 parts, and a toluene solution diluted to a concentration of 50 wt% is added. After coating and drying at 100 ° C. for 3 minutes, ultraviolet irradiation was performed immediately using two ozone type high pressure mercury lamps (80 W / cm, 15 cm condensing type), and a hard coat layer having a thickness of 5 μm was provided to prepare a hard coat film. .

  In order to adjust the heat shrinkage rate of the obtained hard coat film, the hard coat film was passed through a roll-to-roll hot air drying oven (oven temperature 130 ° C.) at 10 m / min. At that time, by adjusting the tension in the oven to the condition of the second floor (low: 60N, middle: 100N), two types of films H1 and H2 having different thermal shrinkage rates were obtained. Each film was cut out as a sample (10 cm × 10 cm) so as to be divided into three equal parts in the width direction. About the film H1, it was set as H-M1, H-B1, and H-C1 from the right side. The same applies to the film H2. Table 1 shows the thermal shrinkage of each hard coat film.

Examples 1-18
(Creation of conductive laminated film)
The conductive film (sample) and the hard coat film (sample) are combined in the combinations shown in Table 1 so that the transparent conductive thin film and the hard coat layer face each other, and both films are interposed via the adhesive layer. Were laminated to form a conductive laminated film. Bonding of the hard coat film is the longitudinal direction of the second transparent substrate (polyethylene terephthalate film) used for the conductive film and the longitudinal direction of the first transparent substrate (polyethylene terephthalate film) used for the hard coat film. And placed so that they overlap.

The pressure-sensitive adhesive layer is a transparent acrylic pressure-sensitive adhesive layer (butyl acrylate: acrylic acid) whose elastic modulus is adjusted to 10 N / cm ² on the second surface of the conductive film (the surface where the transparent conductive thin film is not provided). Acrylic pressure-sensitive adhesive prepared by blending 1 part of an isocyanate-based crosslinking agent into 100 parts of a monomer mixture of 100: 2: 5 by weight of vinyl acetate, and having a thickness of about 20 μm. Further, a hard coat film was laminated thereon. Thereafter, it was allowed to stand in an environment of 150 ° C. for 1 hour, and subjected to a low heat shrinkage treatment to produce a conductive laminated film.

Reference Examples 1-3
In the production of the conductive film, a conductive film was produced in the same manner as described above except that the anchor layer was not provided. Moreover, the film C1 'was obtained by adjusting the heat shrinkage rate under the same conditions as the film C1. Further, the film C ′ was cut out as a sample (10 cm × 10 cm) so as to be divided into three equal parts in the width direction, and C-M1 ′, C-B1 ′, and C-C1 ′ were formed from the right side. Table 1 shows the thermal shrinkage of each conductive film. A conductive laminated film was prepared by the same method as the above method using the combination of the conductive film (sample) and the hard coat film (sample) shown in Table 1.

(Evaluation experiment)
About the electroconductive laminated film obtained by said each example, it was evaluated visually by the following reference | standard whether the stripe | line | column has generate | occur | produced in the vertical direction. The results are shown in Table 1.
A: No streak is observed when the sample is observed from any angle.
B: When the sample is observed from a specific angle, streaks are weakly recognized.
C: A streak is observed even when the sample is observed from any angle.
D: Streaks are clearly recognized when the sample is observed from any angle.

  Further, the degree of curling was examined when the sample was heated in a dryer at 150 ° C. with the ITO vapor deposition surface facing upward for 1 hour. For all the samples, the curl was ± 5 mm or less, and almost no curl was recognized.

表１に示すように、例２、３、５、６、９〜１８では、導電性フィルムの熱収縮率（Ｓ１）と、導電性積層フィルムの熱収縮率（Ｓ３）との差（Ｓ１−Ｓ３）が、−０．１０〜０．２５％の範囲であり、スジの発生は認められなかった。一方、例１、４、７、８では、導電性フィルムの熱収縮率（Ｓ１）と、ハードコートフィルムの熱収縮率（Ｓ３）との差（Ｓ１−Ｓ２）は、０．３％以内であるが、差（Ｓ１−Ｓ３）が、−０．１０〜０．２５％の範囲外にあるため、スジの発生が認められた。なお、参考例１〜３では、アンカー層のない導電性フィルムを用いたこと以外は、例１、４、７と同様の導電性積層フィルムであり、導電性積層フィルムの各熱収縮率も例１、４、７と同様であるが、導電性フィルムがアンカー層を有していないため、差（Ｓ１−Ｓ３）が、−０．１０〜０．２５％の範囲であり、スジの発生は認められなかった。

As shown in Table 1, in Examples 2, 3, 5, 6, 9 to 18, the difference between the heat shrinkage rate (S1) of the conductive film and the heat shrinkage rate (S3) of the conductive laminated film (S1− S3) is in the range of -0.10 to 0.25%, and no streaking was observed. On the other hand, in Examples 1, 4, 7, and 8, the difference (S1-S2) between the heat shrinkage rate (S1) of the conductive film and the heat shrinkage rate (S3) of the hard coat film is within 0.3%. However, since the difference (S1-S3) is outside the range of -0.10 to 0.25%, generation of streaks was recognized. In Reference Examples 1 to 3, except that a conductive film without an anchor layer was used, it was a conductive laminated film similar to Examples 1, 4, and 7, and each heat shrinkage rate of the conductive laminated film was also an example. 1, 4 and 7, but since the conductive film does not have an anchor layer, the difference (S1-S3) is in the range of -0.10 to 0.25%, and the occurrence of streaks I was not able to admit.

It is sectional drawing of an example of the electroconductive laminated film of this invention. It is sectional drawing which shows an example of the touchscreen using the electroconductive laminated film of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conductive film 11 Transparent conductive thin film 12 Second transparent base material 13 Anchor layer 2 Adhesive layer 3 Hard coat film 31 First transparent base material 32 Hard coat layer

Claims (4)

A hard coat film having a hard coat layer formed on the first surface of the first transparent substrate, and a conductive film having a transparent conductive thin film on the first surface of the second transparent substrate via one anchor layer. The conductive laminated film is disposed so that the second surface of the first transparent substrate and the second surface of the second transparent substrate are opposed to each other, and is bonded via an adhesive layer,
Both the first transparent substrate and the second transparent substrate are biaxially stretched films,
Difference between longitudinal heat shrinkage (S1) based on the second transparent substrate in the conductive film and longitudinal heat shrinkage (S3) based on the second transparent substrate in the conductive laminated film (S1-S3) is in the range of -0.10 to 0.25%.   The conductive laminated film according to claim 1, wherein the transparent conductive thin film is an amorphous layer.   An electrode plate for a touch panel using the conductive laminated film according to claim 1.   The touch panel in which a pair of electrode plates for a touch panel having a transparent conductive thin film are arranged to face each other with a spacer so that the transparent conductive thin films face each other, and at least one of the electrode plates for the touch panel is according to claim 3. A touch panel which is an electrode plate for a touch panel.

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