JP2017151801A - Laminate of light transmissive conductive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate of a light transmissive conductive material that prevents the occurrence of moire and grains even when overlapped on a liquid crystal display and provides excellent sharpness to an image displayed on the liquid crystal display.SOLUTION: There is provided a laminate of a light transmissive conductive material that includes at least an adhesive layer and a light transmissive functional material in this order on a light transmissive conductive layer of a light transmissive conductive material including the light transmissive conductive layer on a light transmissive conductive substrate, where the light transmissive conductive layer includes a metal thin line pattern formed with a random pattern; the arithmetic average roughness Ra of the light transmissive functional material on a surface in contact with the adhesive layer is 0.085 to 0.23 μm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light transmissive conductive material laminate, and particularly to a light transmissive conductive material laminate suitable for a projected capacitive touch panel.

  In electronic devices such as personal digital assistants (PDAs), notebook PCs, OA devices, medical devices, and car navigation systems, touch panels are widely used as input means for these displays.

  The touch panel includes an optical method, an ultrasonic method, a surface capacitance method, a projection capacitance method, a resistance film method, and the like depending on a position detection method. In a resistive touch panel, a light-transmitting conductive material and a glass with a light-transmitting conductive layer are arranged to face each other with a spacer as a light-transmitting electrode serving as a touch sensor. It has a structure that measures the voltage in the glass with a flowing light transmissive conductive layer. On the other hand, the capacitive touch panel has a basic structure of a light transmissive conductive material having a light transmissive conductive layer on a base material as a light transmissive electrode serving as a touch sensor, and has no moving parts. Therefore, since it has high durability and light transmittance, it is applied in various applications. Furthermore, since the projected capacitive touch panel can simultaneously detect multiple points, it is widely used for smartphones, tablet PCs, and the like.

  Conventionally, as a light-transmitting conductive material used for a light-transmitting electrode of a touch panel, a material in which a light-transmitting conductive layer made of an ITO (indium tin oxide) conductive film is formed on a base material has been used. However, since the ITO conductive film has a large refractive index and a large surface reflection of light, there is a problem that the light transmittance of the light transmissive conductive material is lowered. In addition, since the ITO conductive film has low flexibility, there is a problem that when the light-transmitting conductive material is bent, the ITO conductive film is cracked and the electric resistance value of the light-transmitting conductive material is increased.

  As a material replacing the light transmissive conductive material having a light transmissive conductive layer made of an ITO conductive film, a metal fine wire pattern is formed on the light transmissive support as a light transmissive conductive layer, for example, the line width or pitch of the metal fine wire pattern. Furthermore, a light-transmitting conductive material is known in which a mesh-shaped fine metal wire pattern is formed by adjusting the pattern shape and the like. By this technique, a light-transmitting conductive material that maintains high light transmittance and has high conductivity can be obtained. With regard to the mesh shape of the mesh-shaped fine metal wire pattern (hereinafter also referred to as a metal pattern), it is known that unit graphics of various shapes can be used. For example, in JP 2013-30378 A, an equilateral triangle, an isosceles side Triangles such as triangles, right triangles, squares, rectangles, rhombuses, parallelograms, trapezoids, etc., (positive) hexagons, (positive) octagons, (positive) dodecagons, (positive) dodecagons, etc. (Correct) A pattern in which unit graphics such as an n-gon, a circle, an ellipse, and a star are repeated, and a pattern in which these two or more types of unit graphics are combined are disclosed.

  As a manufacturing method of the light-transmitting conductive material having the above-described mesh-shaped metal pattern, a thin catalyst layer is formed on a support, a resist pattern is formed thereon, and then a metal layer is formed on the resist opening by plating. Are semi-additive methods for forming a metal pattern by finally removing the resist layer and the base metal protected by the resist layer, for example, Japanese Patent Laid-Open No. 2007-287994, Japanese Patent Laid-Open No. 2007-28753, etc. Is disclosed.

  In recent years, a method using a silver salt photographic light-sensitive material using a silver salt diffusion transfer method as a conductive material precursor is known. For example, in JP-A-2003-77350, JP-A-2005-250169, JP-A-2007-188655, etc., a silver salt photographic photosensitive material having a physical development nucleus layer and a silver halide emulsion layer at least in this order on a support. A technique for forming a metal (silver) pattern by causing a soluble silver salt forming agent and a reducing agent to act on a material (conductive material precursor) in an alkaline solution is disclosed. Patterning by this method can reproduce a uniform line width, and since silver has the highest conductivity among metals, higher conductivity can be obtained with a narrower line width than other methods. Furthermore, the layer having the metal pattern obtained by this method has an advantage that it is more flexible than ITO conductive film and strong against bending.

  Since the light-transmitting conductive material having these metal patterns on the light-transmitting support is placed on the liquid crystal display, the period of the metal pattern interferes with the period of the liquid crystal display element, causing moiré. There was a problem to do. In recent years, liquid crystal displays having various resolutions have been used, which further complicates the above problem.

  For example, Japanese Patent Application Laid-Open No. 2011-216377, Japanese Patent Application Laid-Open No. 2013-37683, Japanese Patent Application Laid-Open No. 2014-17519, Japanese Patent Application Laid-Open No. 2013-540331, for example, “ Mathematical models of Mathematical models from Voronoi diagrams ”(Kyoritsu Publishing Co., Ltd. February 2009), etc., has been proposed a method for suppressing interference by using a long-known random pattern.

  Since these random figures have irregular patterns, it is impossible in principle to cause interference with the period of the liquid crystal display element, and no moiré occurs. However, the random pattern has a problem of so-called “grainy” in which a portion where the metal pattern is irregularly roughed and a portion where the metal pattern is irregularly appear and are visually recognized.

  As means for improving the above-mentioned “grain texture”, for example, Japanese Patent Laid-Open No. 2015-210615 (Patent Document 1) devises a method for arranging generating points for obtaining a Voronoi side forming a random pattern. Random patterns obtained by irregularly shifting the vertices of each repeating unit with respect to the metal pattern obtained by the above and the mesh figure in which the unit figures are regularly arranged are converted into light on the light-transmitting support. There has been proposed a method using a metal pattern obtained repeatedly in at least two directions within the surface of a transparent conductive layer. However, even if the light-transmitting conductive material having a metal pattern obtained in this way is mounted on a liquid crystal display and a uniform green image with little shading is displayed, moire or graininess is present. There are cases where it is visually recognized, and further improvements are required.

  JP-T-2006-521634 (Patent Document 2) proposes that a touch sensor having high transparency and high sheet resistance can be obtained by a touch sensor using a transparent conductive layer having voids randomly arranged. It is described that the scratch resistance is improved by providing additional layers on both surfaces of the upper substrate forming the touch surface. Further, as an example of the additional layer, an antireflection coating or an antiglare coating layer is described.

JP 2013-152578 A (Patent Document 3) discloses a substrate having a surface for the purpose of improving a difference in optical properties produced between a location where the transparent conductive layer is present and a location where the transparent conductive layer is not present, A transparent conductive element having transparent conductive portions and transparent insulating portions arranged alternately in a plane, wherein the transparent insulating portion is a transparent conductive layer composed of a plurality of island portions, and the transparent conductive portion and the transparent insulating portion. A transparent conductive element having an average boundary line length of 20 mm / mm ² or less has been proposed. In addition, an example in which an antireflection layer is provided on the main surface opposite to the side on which the transparent conductive layer is provided, of both main surfaces of the transparent conductive element is described.

  In JP-A-2005-38288 (Patent Document 4), the ten-point average roughness Rz on the surface of the transparent layer formed on one side of the glass substrate for touch panel is set to 0.5 to 6.0 μm. Thus, it has been proposed that a glass for a touch panel having excellent transparency, wear resistance, finger slipping property when a fingertip is in contact and the like and having an anti-glare function can be obtained, and the arithmetic average roughness Ra of the transparent layer is It is described that it is 0.05-0.20 micrometers. However, Patent Document 4 does not suggest that the touch panel glass can improve moire and grain when a light-transmitting conductive material having a thin metal line pattern formed by a random pattern is mounted on a liquid crystal display.

JP2015-210615A JP-T-2006-521634 JP 2013-152578 A JP 2005-38288 A

  An object of the present invention is to provide a light-transmitting conductive material laminate in which moire and grain are not generated even when stacked on a liquid crystal display and the image displayed on the liquid crystal display is excellent in sharpness.

Said subject is solved by the following invention.
(1) A light-transmitting conductive material having a light-transmitting conductive layer having a light-transmitting conductive layer on a light-transmitting conductive layer, and having a pressure-sensitive adhesive layer and a light-transmitting functional material at least in this order on the light-transmitting conductive layer Arithmetic average roughness Ra on the surface of the laminate, the light-transmitting conductive layer having a network-shaped metal fine wire pattern formed from a random pattern and in contact with the pressure-sensitive adhesive layer of the light-transmitting functional material A light-transmitting conductive material laminate having a thickness of 0.085 to 0.23 μm.

  According to the present invention, it is possible to provide a light-transmitting conductive material laminate in which moire and grain are not generated even when stacked on a liquid crystal display, and the image displayed on the liquid crystal display is excellent in sharpness.

Schematic sectional view showing an example of the light-transmitting conductive material laminate of the present invention Schematic which shows an example of the light transmissive conductive material which the light transmissive conductive material laminated body of this invention has Schematic for demonstrating the metal fine wire pattern which has a mesh shape of type a Schematic for demonstrating the metal fine wire pattern which has a mesh shape of type c Schematic for explaining metal fine line pattern region Schematic showing an example of a sensor part and a dummy part of a light transmissive conductive material The figure for demonstrating the repetition period of a unit pattern area | region Transparent original used in the example

  Hereinafter, the present invention will be described in detail with reference to the drawings. It goes without saying that the present invention can be variously modified and modified without departing from the technical scope thereof and is not limited to the following embodiments.

  FIG. 1 is a schematic cross-sectional view showing an example of a light transmissive conductive material laminate of the present invention. In FIG. 1, a light transmissive conductive material laminate a of the present invention includes a light transmissive conductive material 1 having a metal fine wire pattern 3 on a light transmissive support 2 and a metal fine wire pattern 3 on a light transmissive support 2. And another light-transmitting conductive material 1 ′ is laminated via the pressure-sensitive adhesive layer 4, and the other light-transmissive conductive material 1 ′ is stacked via the pressure-sensitive adhesive layer 4. Are stacked.

  The thin metal wire pattern 3 in the light-transmissive conductive material laminate a is preferably made of gold, silver, copper, nickel, aluminum, and a composite material thereof. Methods for forming these fine metal wire patterns 3 include a method using a silver salt photosensitive material, a method of applying electroless plating or electrolytic plating to a silver image further obtained using the method, and a silver paste using a screen printing method. A known method such as a method of printing a conductive ink such as silver or a method of printing a conductive ink such as silver ink by an inkjet method can be used. Among them, it is preferable to use a silver salt diffusion transfer method that can reduce the thickness of the obtained metal pattern and can easily form an extremely fine metal pattern. The silver salt diffusion transfer method is described in, for example, Japanese Patent Application Laid-Open Nos. 2003-77350 and 2005-250169.

  In the present invention, the light transmissive conductive material has a light transmissive conductive layer on a light transmissive support. FIG. 2 is a schematic diagram illustrating an example of a light transmissive conductive material included in the light transmissive conductive material laminate of the present invention, and illustrates an example of a light transmissive electrode of a touch panel using a capacitance method. In FIG. 2, the light-transmitting conductive material 1 has a sensor part 11, a dummy part 12, a peripheral wiring part 14, and a terminal part 15 made of a metal pattern on at least one side of the light-transmitting support 2, and has no metal pattern. It has an image part 13. Here, although the sensor part 11 and the dummy part 12 are comprised from the mesh-shaped metal fine wire formed from a random pattern, those ranges are shown with the outline for convenience. The sensor unit 11 is electrically connected to the terminal unit 15 via the peripheral wiring unit 14, and the capacitance change sensed by the sensor unit 11 is electrically connected to the outside through the terminal unit 15. Can be caught. In the present invention, the sensor unit 11 may be electrically connected by directly contacting the terminal unit 15, but as shown in FIG. 2, in order to collect a plurality of terminal units 15 in the vicinity, the peripheral wiring unit It is preferable that the sensor unit 11 is electrically connected to the terminal unit 15 via 14. On the other hand, all metal patterns not electrically connected to the terminal portion 15 become the dummy portion 12 in the present invention. Since the peripheral wiring part 14 and the terminal part 15 do not need to have a light transmission property in particular, they may be solid patterns (patterns having no light transmission property), or light transmission properties such as the sensor part 11 and the dummy part 12. You may have.

  In FIG. 2, the sensor portion 11 included in the light transmissive conductive material 1 is a column electrode extending in the x direction within the light transmissive conductive layer surface, and the x direction within the light transmissive conductive layer surface with the dummy portion 12 interposed therebetween. A plurality of rows are arranged in the y direction which is a vertical direction. In the present invention, as shown in FIG. 2, the sensor units 11 are preferably arranged with an arbitrary period in the y direction. The period of the sensor unit 11 can be arbitrarily set as long as the resolution as a touch sensor can be maintained. The sensor unit 11 may have a constant width, but preferably has a pattern period in the x direction as shown in FIG. Also, the width of the sensor unit 11 can be arbitrarily set within a range in which the resolution as a touch sensor can be maintained, and the width and shape of the dummy unit 12 can be set accordingly.

  In the present invention, the light-transmitting conductive layer has a mesh-shaped fine metal wire pattern formed from a random pattern. The metal fine line pattern formed from the random pattern may be applied to either the sensor part and / or the dummy part, but is preferably applied to the sensor part, and is applied to the sensor part and the dummy part. It is preferable. Below, the metal fine wire pattern formed from a random pattern in this invention is demonstrated.

  In the present invention, the fine metal wire pattern constituting the light transmissive conductive layer is obtained by converting a unit pattern region composed of a fine metal wire pattern having a mesh shape obtained by any one of the following methods a, b, and c into a light transmissive shape. It is preferable to repeatedly have at least two directions within the surface of the light-transmitting conductive layer on the support. Thereby, the visibility (difficult visibility) of grain can be improved more.

<A: Voronoi figure type>
Among the mesh-shaped fine metal wire patterns used in the present invention, the most preferred is a fine metal wire pattern based on Voronoi figures obtained by the method described below. A Voronoi figure is a known figure applied in various fields such as information processing, and FIG. 3 is used to explain this figure. FIG. 3 is a schematic view for explaining a fine metal wire pattern having a type a mesh shape. In (3-a) of FIG. 3, when a plurality of generating points 211 are arranged on the plane 20, a region 21 closest to one arbitrary generating point 211 and a region 21 closest to another generating point When the plane 20 is divided by dividing the line 20 by the boundary line 22, the boundary line 22 of each region 21 is called a Voronoi side, and a figure formed by collecting the Voronoi sides is called a Voronoi figure.

  (3-b) in FIG. 3 is a diagram for explaining a generating point arrangement method. The plane 20 is filled with twelve quadrilaterals 23 without gaps, and one generating point 211 is always arranged in the quadrangle 23. In FIG. 3, a quadrangle is used as the polygon filling the plane. However, in the present invention, a triangle or a hexagon may be used in addition to the quadrangle, and a plurality of types and sizes of polygons may be used. Also good. Among those choices, plane filling with a single shape and a single size polygon is preferred. The length of one side of the polygon is preferably 100 to 2000 μm, more preferably 150 to 800 μm. As described above, only one generating point is arranged in the polygon. The position will be described using (3-b) in FIG. 3 or (3-c) which is an enlarged view thereof. In the straight line connecting the center of gravity 24 of the rectangle 23 and each vertex of the rectangle 23, the reduced polygon is formed by connecting the positions 251, 252, 253, 254 90% of the distance from the center of gravity 24 to each vertex. The mother point is arranged at an arbitrary position in the reduced square 25. In the present invention, the Voronoi side is most preferably a straight line, but a curved line, a wavy line, a zigzag line, or the like can also be used.

<B: Non-periodic filling figure type>
Examples of the metal fine line pattern having another mesh shape used in the present invention include a non-periodic filling figure (type b) filled with a non-periodic plane using a plurality of polygons. As a method for forming the non-periodic filling figure, a known method can be used. For example, there are two types of diamonds devised by Roger Penrose, a rhombus with an acute angle of 72 ° and an obtuse angle of 108 °, and a rhombus with an acute angle of 36 ° and an obtuse angle of 144 °. Penrose tiles that use rhombuses in combination, and other non-periodic plane-filled figures made up of three polygons: squares, equilateral triangles, and parallelograms with angles of 30 ° and 150 °. "Gilly" pattern. The sides of these figures are preferably straight lines, but curved lines, wavy lines, zigzag lines, and the like can also be used. The length of the longest side of all the polygons used in the non-periodic filled figure (the distance between vertices is the length of the side when using wavy lines, curves, etc.) is the second direction. 1/3 or less of the period between the sensor parts arranged in a row, preferably 100 to 1000 μm, more preferably 150 to 500 μm.

<C: Random mesh type>
Examples of the fine metal wire pattern having another mesh shape used in the present invention include a random mesh (type c) in which the vertices of a regular mesh that are generally used are irregularly shifted. Hereinafter, the random mesh will be described with reference to FIG. FIG. 4 is a schematic view for explaining a fine metal wire pattern having a type c mesh shape. In the description, the figure before irregularly shifting the vertices is referred to as an original figure, and 31 in (4-a) of FIG. The original figure 31 is configured by repeating an original unit figure 32 (shown by a bold line for the sake of explanation). A known shape can be used as the basic figure 32, for example, a triangle such as an equilateral triangle, an isosceles triangle, a right triangle, a square, a rectangle, a rhombus, a parallelogram, a trapezoid, a quadrangle, a hexagon, an octagon, These include n-gons such as dodecagons and icosahedrons, circles, ellipses, and star shapes, and original shapes formed by repeating these shapes alone or in combination of two or more types are used. be able to. Further, even if the side is not a straight line, it may be constituted by, for example, a zigzag line or a wavy line. Furthermore, a brickwork pattern as disclosed in Japanese Patent Application Laid-Open No. 2002-223095 can also be used. In the present invention, any of these basic unit figures can be used, but is preferably a square or rhombus, more preferably a rhombus having an acute angle of 30 to 70 °. The length of the side of the basic unit graphic 32 (when using a wavy line, a curve, or the like, the distance between vertices is the length) is preferably 1000 μm or less, and more preferably 150 to 500 μm.

  A method for shifting the vertex from the original figure will be described. In (4-b) of FIG. 4, the basic unit graphic 32 is indicated by a broken line. By connecting the vertices 331, 332, 333, and 334 where the four vertices 321, 322, 323, and 324 of the basic unit graphic 32 are shifted, a new graphic 33 indicated by a solid line is formed. The shift distance z from the vertex 321 to the vertex 331 is smaller than ½ of the distance between the center of gravity of the basic unit graphic and the closest vertex (321 or 323 in the case of FIG. 4). In other words, the deviation distance z is centered on the center of gravity of the basic figure, and its radius is 1/2 of the radius r of the circle 34 equal to the distance from the center to the nearest vertex (321 or 323 in the case of FIG. 4). (For the sake of easy understanding, in FIG. 4 (4-b), a circle with a radius r / 2 centered on the vertices 321, 322, 323, and 324 is shown in FIG. 4). About a direction, it is arbitrary directions. The same applies to the shift distances and directions of the other vertices 332, 333, and 334.

  The vertices of the basic figure 32 are shifted as shown in FIG. 4 (4-b), and the figure connecting the vertices is (4-c) in FIG. 4, which is the type c mesh shape used in the present invention. An example. In the random mesh 35 of (4-c), 81 (96%) of 84 intersections of the original figure 31 are shifted from the original position of the original figure. In the present invention, some of the intersections may be at the same position as the original figure as described above, but at least 50% or more of the intersections are deviated from the positions of the intersections of the original figure, and 75% or more of the intersections. It is preferable to deviate from the position of the intersection of the original figures.

  In the present invention, as described above, the unit pattern region composed of the fine metal wire pattern having the mesh shape of any of type a, type b, or type c described above is repeated in at least two directions within the surface of the light-transmitting conductive layer. Thus, it is preferable to form the sensor part 11 and the dummy part 12 in FIG. FIG. 5 is a schematic view for explaining the metal fine line pattern region. (5-a) is an example of a unit pattern region having a mesh shape of type a, type b, and type c from the left. For example, an example in which the unit pattern area 41 having a mesh shape of type a is repeated is (5-b). The mesh shape of the unit pattern area 41 is a random pattern having no period within the range of the unit pattern area surrounded by the square 44. This unit pattern region 41 (the length in the x direction is 42 and the length in the y direction is 43) is repeated with a repetition period 42 in the x direction and a repetition period 43 in the y direction to form a series of large fine metal wire patterns. doing. When the unit pattern region having a random mesh shape is repeated in this way, the fine metal wires are not connected to each other at the boundary between adjacent unit pattern regions, and in particular, the sensor unit 11 may be disconnected. The position of the fine metal line located on the square 44 of the pattern area 41 is preferably corrected from the original figure so as to be connected to the fine metal line of the adjacent unit pattern area when repeated.

  In (5-b) of FIG. 5, the sensor unit 11 and the dummy unit 12 are formed by repeating a square unit pattern region 41 in two directions orthogonal to each other in the light-transmitting conductive layer surface. If the shape of the shape can be filled with a plane using the same, for example, a triangle such as a regular triangle, an isosceles triangle, a right triangle, a square, a rectangle, a rhombus, a parallelogram, a square such as a trapezoid, a regular hexagon, and Any shape such as a combination of two or more of these and other shapes may be used. Moreover, the direction to repeat can also select at least two directions in the light-transmitting conductive layer surface according to the contour shape in the range of the unit pattern region. In the present invention, as shown in FIG. 5 (5-b), the unit pattern region having a square outline shape is repeated in two directions orthogonal to each other in the plane of the light-transmitting conductive layer, and the sensor unit 11 and / or It is preferable to form the dummy part 12.

  As described in the description of FIG. 2, there is no electrical connection between the sensor unit and the dummy unit. FIG. 6 is a schematic view showing an example of a sensor part and a dummy part of a light transmissive conductive material. In FIG. 6 (6-a), the sensor unit 11 and the dummy unit 12 are formed by a unit pattern region composed of a fine metal line pattern having a type a mesh shape, and the sensor unit 11 is electrically connected to the peripheral wiring 14. ing. A temporary boundary line R is illustrated at the boundary between the sensor unit 11 and the dummy unit 12 (in practice, the line indicated by the boundary line R is not a metal pattern), and the sensor is located at the position of the temporary boundary line R. Between the part 11 and the dummy part 12, the disconnection part for disconnecting an electrical connection is provided. The length of the disconnection portion (the length at which the fine metal wire is interrupted) is preferably 3 to 100 μm, more preferably 5 to 20 μm. In FIG. 5, the disconnection portion is provided only at a position along the temporary boundary line R, but in addition to that, one or a plurality of disconnection portions may be provided in the dummy portion or the like as necessary. FIG. 6 (6-b) shows only the actual metal pattern by removing the temporary boundary line R from (6-a) in FIG. 6.

  FIG. 7 is a diagram for explaining the repetition cycle of the unit pattern region. The unit pattern region 41 composed of a metal fine line pattern having an irregular mesh shape surrounded by a square 44 (in practice, the line indicated by the square 44 is not a metal pattern but is shown for explanation) is repeated. Thus, the sensor unit 11 and the dummy unit 12 are configured. A temporary boundary line R is illustrated at the boundary between the sensor unit 11 and the dummy unit 12, and a disconnection unit is provided at the position of R, and the electrical connection between the sensor unit 11 and the dummy unit 12 is disconnected. Yes. The unit pattern areas 41 are repeatedly arranged with a repetition period 42 in the x direction and a repetition period 43 in the y direction, and are entirely spread. In FIG. 7, the repetition period 43 is the same as the column period 63 in which the sensor units 11 are arranged in the y direction. The relationship between the repetition period 43 and the column period 63 is preferably such that the repetition period 43 is an integer multiple of the column period 63 or the column period 63 is an integer multiple of the repetition period 43, as shown in FIG. More preferably, they are the same. Further, the repetition period 43 is preferably 1 mm or more, or when the display element to be bonded to the light transmissive electrode has a y-direction period when it is used as a touch panel, it is 5 times or more, more preferably 10 times. It is more than double. The maximum value of the repetition period 43 is preferably 10 times or less of the column period 63.

  In FIG. 7, the repetition period 42 is the same as the pattern period 62 in the x direction of the sensor unit 11. The relationship between the repetition period 42 and the pattern period 62 is preferably the same as the period 42 is an integral multiple of the pattern period 62 or the pattern period 62 is an integral multiple of the repetition period 42. More preferred. Further, the repetition period 42 is preferably 1 mm or more, or, when a touch panel is used, if the display element to be bonded to the light transmissive electrode has a period in the x direction, it is 5 times or more, more preferably 10 times. It is more than double. The maximum value of the repetition period 42 is preferably 10 times or less of the pattern period 62.

  In the above description, only the light transmissive conductive material having the sensor portion extending in the x direction is described. However, in the light transmissive electrode of the actual touch panel, the light transmissive conductive material is paired with the light transmissive conductive material in the y direction. Since the light-transmitting conductive material having the extended sensor part is used in an overlapping manner, it is preferable that the sensor parts extended in the y direction are arranged with an arbitrary period in the x direction. In the example of the light transmissive conductive material laminate shown in FIG. 1 described above, the thin metal wire pattern 3 included in the light transmissive conductive material 1 corresponds to a sensor portion extending in the x direction. The metal thin line pattern 3 included in ′ corresponds to a sensor portion extending in the y direction. If the column period in the x direction is 64, the column period 64 is preferably the same as the pattern period 62 in the x direction of the sensor unit 11 in FIG. 7, and may be the same as the repetition period 42 of the unit pattern region. preferable.

  As the light transmissive support 2 constituting the light transmissive conductive material in the light transmissive conductive material laminate a in FIG. 1, polyester resin such as glass or polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), acrylic Resin, epoxy resin, fluorine resin, silicone resin, polycarbonate resin, diacetate resin, triacetate resin, polyarylate resin, polyvinyl chloride, polysulfone resin, polyethersulfone resin, polyimide resin, polyamide resin, polyolefin resin, cyclic polyolefin resin It is preferable to use a known light-transmitting sheet such as. Here, light transmittance means that the total light transmittance is 60% or more, and the total light transmittance of the light transmissive support is preferably 85% or more. The thickness of the light transmissive support 2 is preferably 50 μm to 5 mm. The light transmissive support 2 may be provided with a known layer such as a fingerprint antifouling layer, a hard coat layer, an antireflection layer, or an antiglare layer.

  The pressure-sensitive adhesive layer 4 included in the light-transmitting conductive material laminate of the present invention means a layer composed of a material having adhesiveness, and a known material can be used. In general, an acrylic resin is preferably used as an adhesive material.

  As an acrylic resin which comprises the adhesive layer 4, the polymer of the mixture containing a (meth) acrylic acid ester type monomer and a (meth) acrylic acid ester type monomer and a polyfunctional crosslinking agent can be illustrated. . The kind of (meth) acrylic acid ester monomer is not particularly limited, and for example, alkyl (meth) acrylate can be used. In this case, if the alkyl chain contained in the structure is too long, the cohesive strength of the cured product is lowered, and it may be difficult to adjust the glass transition temperature and the adhesiveness. An alkyl (meth) acrylate having an alkyl group having 1 to 8 carbon atoms can be used. Examples of such monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, t-butyl (meth) ) Acrylate, sec-butyl (meth) acrylate, pentyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-ethylbutyl (meth) acrylate, n-octyl (meth) acrylate, isooctyl (meth) acrylate, isobonyl (meth) ) Acrylate or isononyl (meth) acrylate, and the like. In the present invention, one or a mixture of two or more of the above can be used.

  The polyfunctional crosslinking agent described above can adjust the cohesive force or adhesive property of the cured product of the acrylic resin described above depending on the amount of use. The kind of polyfunctional crosslinking agent is not specifically limited, For example, common polyfunctional crosslinking agents like an isocyanate type compound, an epoxy type compound, an aziridine type compound, and a metal chelate type compound can be used. In the above, examples of the isocyanate compound include tolylene diisocyanate, xylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, tetramethylxylene diisocyanate, naphthalene diisocyanate, and one or more isocyanate compounds and polyols (for example, trimethylol). One or more selected from the group consisting of reactants with propane); examples of epoxy compounds include ethylene glycol diglycidyl ether, triglycidyl ether, trimethylolpropane triglycidyl ether, N, N , N ′, N′-tetraglycidylethylenediamine and one or more selected from the group consisting of glycerin diglycidyl ether Examples of aziridine compounds include N, N'-toluene-2,4-bis (1-aziridinecarboxamide), N, N'-diphenylmethane-4,4'-bis (1-aziridinecarboxamide) And one or more selected from the group consisting of triethylenemelamine, bisisoprotaloyl-1- (2-methylaziridine) and tri-1-aziridinylphosphine oxide. Examples of the metal chelate compounds include compounds in which a polyvalent metal such as aluminum, iron, zinc, tin, titanium, antimony, magnesium and / or vanadium is coordinated to acetylacetone or ethyl acetoacetate. It can be used but is not limited to this.

  Moreover, as a commercial item used for formation of the adhesive layer 4, for example, the pressure-sensitive adhesive sheet MOseries for capacitance type film sensor manufactured by Lintec Co., Ltd. or the highly transparent base material-less double-sided adhesive sheet MHM- manufactured by Nichiei Kako Co., Ltd. FWD etc. are illustrated.

  Examples of the light transmissive functional material 5 included in the light transmissive conductive material laminate of the present invention include various known lights such as a cover glass, a hard coat film, an antireflection film, an antiglare film, a light transmissive conductive film, and a polarizing film. A transparent functional material can be used, and in order to obtain the effects of the present invention, the arithmetic average roughness Ra of the surface in contact with the pressure-sensitive adhesive layer of the light transparent functional material needs to be 0.085 to 0.23 μm. It is. If the arithmetic average roughness Ra of the light-transmitting functional material is less than 0.085 μm, “moire” or “grainy” is visually recognized, and if the arithmetic average roughness Ra exceeds 0.23 μm, the liquid crystal The image displayed on the display is inferior in sharpness. In the present invention, the arithmetic average roughness Ra of the surface in contact with the pressure-sensitive adhesive layer of the light-transmitting functional material is more preferably from 0.11 to 0.23 μm, whereby the visibility of “moire” and “grainy” is improved. It is possible to obtain a light-transmitting conductive material laminate that is particularly excellent in (difficult visibility).

  In the present invention, the arithmetic average roughness on the surface of the light-transmitting functional material 5 that does not contact the pressure-sensitive adhesive layer is not particularly defined. For example, the same as the surface that contacts the pressure-sensitive adhesive layer of the light-transmitting functional material. The arithmetic average roughness Ra may be 0.085 to 0.23 μm.

  As a light-transmitting functional material for obtaining the effects of the present invention, for example, a cover glass is taken as an example, and a manufacturing method thereof is shown below.

  First, a glass substrate is prepared. The kind of glass substrate is not specifically limited. As the glass substrate, for example, a transparent glass substrate made of soda lime glass, soda lime silicate glass, aluminosilicate glass, borate glass, lithium aluminosilicate glass, quartz glass, borosilicate glass, non-alkali glass, and other various glasses. Can be used.

  Next, unevenness is formed on the surface by roughening the surface of the glass substrate. Such a process for forming irregularities on the surface is performed, for example, by a blast process, a wet process, or an embossing process.

  Among these, the blasting process is a general term for a process (for example, a sandblasting process, a water blasting process, a dry ice blasting process, etc.) that makes alumina or the like collide with the surface of the glass substrate to roughen the surface. In addition, wet processing means a general term for processing in which a glass substrate is immersed in various solutions to roughen the surface. Furthermore, the die pressing process is a general term for a process of transferring a pattern to a glass substrate by pressing a mold having a concavo-convex pattern onto the surface of the glass substrate like a plate glass.

  In the previous section, the method for roughening the surface of the glass substrate by treating the surface of the glass substrate and forming the irregularities has been described. However, in the present invention, in addition to the method described above, for example, by coating or the above-described treatment It is also possible to adjust the arithmetic average roughness Ra to 0.085 to 0.23 μm by combining the coating and the coating.

  The arithmetic average roughness Ra in the present invention is based on the measurement method of JIS B0601 (2001), and can be measured by, for example, a surface roughness measuring machine Surfcom 1400D manufactured by Tokyo Seimitsu Co., Ltd.

  EXAMPLES Hereinafter, although this invention is demonstrated in detail using an Example, this invention is not limited to a following example, unless the summary is exceeded.

<Preparation of light transmissive conductive material laminate 1>
A polyethylene terephthalate film having a thickness of 100 μm was used as the light transmissive support. The total light transmittance of this light transmissive support was 91%.

  Next, according to the following prescription, a physical development nucleus layer coating solution was prepared, applied onto the light transmissive support, and dried to provide a physical development nucleus layer.

<Preparation of palladium sulfide sol>
Liquid A Palladium chloride 5g
Hydrochloric acid 40ml
1000ml distilled water
B liquid sodium sulfide 8.6g
1000ml distilled water
Liquid A and liquid B were mixed with stirring, and 30 minutes later, the solution was passed through a column filled with an ion exchange resin to obtain palladium sulfide sol.

<Preparation of coating solution for physical development nucleus layer> Amount of silver salt photosensitive material per 1 m ^{2 The} palladium sulfide sol 0.4 mg
0.2% aqueous 2 mass% glyoxal solution
Surfactant (S-1) 4mg
Denacol EX-830 50mg
(Polyethylene glycol diglycidyl ether manufactured by Nagase ChemteX Corporation)
10 mass% SP-200 aqueous solution 0.5 mg
(Nippon Shokubai Polyethyleneimine; average molecular weight 10,000)

  Subsequently, an intermediate layer, a silver halide emulsion layer, and a protective layer having the following composition are coated on the physical development nucleus solution layer in order from the side closest to the light-transmitting support and dried to obtain a silver salt photosensitive material. It was. The silver halide emulsion was prepared by a general double jet mixing method for photographic silver halide emulsions. This silver halide emulsion was prepared with 95 mol% of silver chloride and 5 mol% of silver bromide, and an average grain size of 0.15 μm. The silver halide emulsion thus obtained was subjected to gold sulfur sensitization using sodium thiosulfate and chloroauric acid according to a conventional method. The silver halide emulsion thus obtained contains 0.5 g of gelatin per gram of silver.

<Interlayer composition> Amount of silver salt photosensitive material per 1 m ² Gelatin 0.5 g
Surfactant (S-1) 5mg
Dye 1 50mg

<Silver halide emulsion layer composition> Amount of silver salt photosensitive material per 1 m ² Gelatin 0.5 g
Silver halide emulsion 3.0g Silver equivalent 1-Phenyl-5-mercaptotetrazole 3mg
Surfactant (S-1) 20mg

<Protective layer composition> Silver salt photosensitive material per 1 m ² Gelatin 1 g
Amorphous silica matting agent (average particle size 3.5μm) 10mg
Surfactant (S-1) 10mg

  A transparent original having the pattern image of FIG. 2 was brought into close contact with the silver salt light-sensitive material thus obtained, and exposed through a resin filter that cut light of 400 nm or less with a contact printer using a mercury lamp as a light source. Note that (8-a) in FIG. 8 is an enlarged view of a part of the transparent original. Further, although there is no actual image, for the sake of understanding, the provisional boundary R between the sensor part and the dummy part and the outline 44 of the unit pattern area are added as shown in FIG. 8B. The repetition period in the x direction of the unit pattern area is 5 mm, which is equal to the pattern period in the x direction of the sensor part, and the repetition period in the y direction of the unit pattern area is 5 mm, which is equal to the column period in the y direction of the sensor part. The mesh shape constituting the unit pattern region is a type a Voronoi figure. The base point of the Voronoi figure is filled with a rectangle with one side in the x direction having a length of 0.6 mm and one side in the y direction having a length of 0.4 mm in the x and y directions. Randomly placed in a reduced rectangle formed by connecting 80% of the distance to each vertex. The line width of the thin line image having the shape of the Voronoi side was 4 μm. All thin line images at the boundary between the sensor part and the dummy part (position of the temporary boundary line R) are provided with a disconnection part having a length of 20 μm. The total light transmittance of the sensor part is 89.5%, and the total light transmittance of the dummy part is 89.5%.

  Thereafter, the film was immersed in the following diffusion transfer developer at 20 ° C. for 60 seconds, and then the silver halide emulsion layer, intermediate layer, and protective layer were washed away with warm water at 40 ° C. and dried. Thus, a light transmissive conductive material 1 having a metal silver image having the shape of FIG. 8 was obtained as a light transmissive conductive layer. The metallic silver image of the light transmissive conductive layer of the obtained light transmissive conductive material had the same shape and the same line width as the transmissive original having the shape of FIG. The film thickness of the metal silver image was 0.1 μm as determined by a confocal microscope (Latertec Corp., Optics C130).

  Next, in the transparent original having the pattern image of FIG. 2, a similar transparent original is prepared except that the direction in which the sensor unit extends is changed from the x direction to the y direction, and light is used except that the transparent original is exposed. The light transmissive conductive material 2 was obtained in the same manner as the production of the transmissive conductive material 1. In addition, the fine line width and fine line interval of the metal mesh pattern part and the trace part of the light transmissive conductive material 2 were the same as those of the light transmissive conductive material 1.

<Diffusion transfer developer composition>
Potassium hydroxide 25g
Hydroquinone 18g
1-phenyl-3-pyrazolidone 2g
Potassium sulfite 80g
N-methylethanolamine 15g
Potassium bromide 1.2g
Total volume 1000ml with water
Adjust to pH = 12.2.

  Next, the metal fine wire pattern surface of the obtained light-transmitting conductive material 2 and the surface on the support side of the light-transmitting conductive material 1 are used with MHM-FW175 (Nichiei Kako Co., Ltd. optical transparent adhesive sheet). Then, they were bonded so that the sensor parts of the light transmissive conductive materials were orthogonal to each other. Subsequently, the surface of the light transmissive conductive material 1 having the fine metal wire pattern and Gs 50% product (AG glass manufactured by Figura Co., Ltd.) as the light transmissive functional material are manufactured by MHM-FW175 (manufactured by Nichiei Chemical Co., Ltd.). An optically transparent adhesive sheet) was used to obtain a light transmissive conductive material laminate 1. In addition, it was 0.18 micrometer when the arithmetic mean roughness of the surface which contact | connects MHM-FW175 of Gs50% goods was measured with the Tokyo Seimitsu Co., Ltd. surface roughness measuring machine Surfcom 1400D.

<Preparation of light transmissive conductive material laminate 2>
A light transmissive conductive material laminate 2 was obtained in the same manner as the light transmissive conductive material laminate 1 except that a Gs65% product (AG glass manufactured by Figra Co., Ltd.) was used as the light transmissive functional material. The arithmetic average roughness of the surface in contact with the GHM65% MHM-FW175 was 0.12 μm.

<Preparation of light transmissive conductive material laminate 3>
A light transmissive conductive material laminate 3 was obtained in the same manner as the light transmissive conductive material laminate 1 except that a Gs85% product (AG glass manufactured by Figura Co., Ltd.) was used as the light transmissive functional material. In addition, the arithmetic mean roughness of the surface which touches MHM-FW175 of Gs85% goods was 0.09 micrometer.

<Preparation of light transmissive conductive material laminate 4>
A light-transmitting conductive material laminate 4 was obtained in the same manner as the light-transmitting conductive material laminate 1 except that a Gs 110% product (AG glass manufactured by Figra Co., Ltd.) was used as the light-transmitting functional material. The arithmetic average roughness of the surface in contact with the GHM110% MHM-FW175 was 0.08 μm.

<Preparation of light transmissive conductive material laminate 5>
A light-transmitting conductive material laminate 5 was obtained in the same manner as the light-transmitting conductive material laminate 1 except that a Gs35% product (AG glass manufactured by Figura Co., Ltd.) was used as the light-transmitting functional material. The arithmetic average roughness of the surface in contact with GHM35% MHM-FW175 was 0.27 μm.

  About each of the obtained light transmissive conductive material laminated bodies 1-5, visibility and the clarity of a display image were evaluated. The results are shown in Table 1. Regarding the visibility, the obtained light-transmitting conductive material laminate was placed on a Flatron 23EN43V-B2 23-type wide liquid crystal monitor (LG Electronics Co., Ltd.) displaying a green solid image, observed visually, and moire. In addition, the case where the grain was clearly visible was evaluated as x, the case where the moire or the grain was clearly observed was evaluated as Δ, and the case where the moire or the grain was not recognized was evaluated as ◯. As for the clearness of the displayed image, when the image (grass landscape image) is displayed on the same monitor, the image is judged to be inferior, x, and the image judged to be clear It was. The results are shown in Table 1.

  As is clear from the above results, a light-transmitting conductive material laminate having excellent crispness of the image displayed on the liquid crystal display without causing moire or graininess even when stacked on the liquid crystal display is obtained by the present invention. I understand that

a Light transmissive conductive material laminate 1 1 ′ Light transmissive conductive material 2 Light transmissive support 3 Metal fine wire pattern 4 Adhesive layer 5 Light transmissive functional material 11 Sensor portion 12 Dummy portion 13 Non-image portion 14 Peripheral wiring portion 15 Terminal section

Claims (1)

  A light transmissive conductive material laminate comprising a light transmissive conductive material having a light transmissive conductive layer on a light transmissive support and having a pressure-sensitive adhesive layer and a light transmissive functional material at least in this order on the light transmissive conductive layer. The light-transmitting conductive layer has a network-like fine metal wire pattern formed from a random pattern, and the arithmetic average roughness Ra on the surface in contact with the pressure-sensitive adhesive layer of the light-transmitting functional material is 0.085. A light-transmitting conductive material laminate having a thickness of ˜0.23 μm.