WO2023063379A1

WO2023063379A1 - Wiring sheet

Info

Publication number: WO2023063379A1
Application number: PCT/JP2022/038141
Authority: WO
Inventors: 孝至森岡; 祐馬勝田
Original assignee: リンテック株式会社
Priority date: 2021-10-14
Filing date: 2022-10-13
Publication date: 2023-04-20

Abstract

This wiring sheet comprises: a first pseudo-sheet structure (2) in which a plurality of first linear conductive bodies (21) are arranged at intervals; a first electrode (41) electrically connected to one or more among the first linear conductive bodies (21); a second electrode (42) paired with the first electrode (41) and electrically connected to the first linear conductive bodies (21) that are not electrically connected to the first electrode (41); and a second pseudo-sheet structure in which a plurality of second linear conductive bodies (61) are arranged at intervals. The volume resistivity of the first linear conductive bodies (21) is lower than the volume resistivity of the second linear conductive bodies (61). The resistance values differ between any of the second linear conductive bodies (61) that intersect at respective intersections in a plan view of the wiring sheet (100), are electrically connected at the intersections, and are between the intersections.

Description

wiring sheet

The present invention relates to wiring sheets.

As a wiring sheet that can be used for planar heaters, for example, Patent Document 1 describes a conductive sheet having a pseudo-sheet structure in which a plurality of linear bodies extending in one direction are arranged at intervals. ing. By providing a pair of electrodes on both ends of the plurality of linear bodies, a wiring sheet that can be used as a heating element is obtained.
On the other hand, in the planar heater, it may be required to set the temperature for each location within the sheet plane. The planar heater described in Patent Document 1 cannot meet such requirements.

WO2017/086395

An object of the present invention is to provide a wiring sheet that can change the amount of current for each location within the plane of the sheet.

[1] A first pseudo-sheet structure in which a plurality of first conductive linear bodies are arranged at intervals, and a first electrode electrically connected to one or more of the first conductive linear bodies , a second electrode paired with the first electrode and electrically connected to one of the first conductive linear bodies that is not electrically connected to the first electrode; and a plurality of second conductive and a second pseudo-sheet structure in which linear bodies are arranged at intervals, wherein the volume resistivity of the first conductive linear bodies is the volume resistance of the second conductive linear bodies. In a plan view of the wiring sheet, the first conductive linear bodies and the second conductive linear bodies intersect at each intersection, and the first conductive linear bodies and the The second conductive linear bodies are electrically connected at the intersections, and the resistance value is different between any of the second conductive linear bodies between the intersections. wiring sheet.

[2] In the wiring sheet described in [1], the wiring sheet has a different thickness between any of the second conductive linear bodies.

[3] The wiring sheet according to [1] or [2], wherein the material is different between any of the second conductive linear bodies.

[4] In the wiring sheet according to any one of [1] to [3], the wiring sheet has different intervals between any of the first conductive linear bodies.

[5] In the wiring sheet according to any one of [1] to [4], the first conductive linear body and the second conductive linear body are gold-plated linear bodies. , wiring sheet.

According to the present invention, it is possible to provide a wiring sheet that can change the amount of current for each location within the plane of the sheet.

1 is a schematic exploded perspective view showing a wiring sheet according to a first embodiment of the invention; FIG. FIG. 2 is a sectional view showing the II-II section of FIG. 1; FIG. 2 is a cross-sectional view showing the III-III cross section of FIG. 1; 1 is a schematic plan view showing a wiring sheet according to a first embodiment of the invention; FIG. [ Fig. 10] Fig. 10 is a schematic perspective view showing a first pseudo sheet structure, first electrodes and second electrodes according to a second embodiment of the present invention.

[First embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described with reference to the drawings, taking an embodiment as an example. The invention is not limited to the content of the embodiments. In the drawings, some parts are enlarged or reduced for ease of explanation.

(wiring sheet)
As shown in FIGS. 1, 2, 3, and 4, the wiring sheet 100 according to the present embodiment has a first base material 1 and a plurality of first conductive linear bodies 21 arranged at intervals. A first pseudo sheet structure 2, a first resin layer 3, a first electrode 41, a second electrode 42, a second substrate 5, and a plurality of second conductive linear bodies 61 are arranged at intervals. A second pseudo sheet structure 6 and a second resin layer 7 are provided.
The first electrode 41 and the second electrode 42 are paired. Also, the first electrode 41 is electrically connected to one or more of the first conductive linear bodies 21 . The second electrode 42 is electrically connected to one of the first conductive linear bodies 21 that is not electrically connected to the first electrode 41 . On the other hand, the second electrode 42 is not electrically connected to one of the first conductive linear bodies 21 that is electrically connected to the first electrode 41 .
The volume resistivity of first conductive linear body 21 is smaller than the volume resistivity of second conductive linear body 61 . In addition, in a plan view of wiring sheet 100, first conductive linear bodies 21 and second conductive linear bodies 61 intersect at respective intersections. Also, the first conductive linear body 21 and the second conductive linear body 61 are electrically connected at the intersection. Moreover, the resistance value is different between any of the second conductive linear bodies 61 between the intersections.

In the wiring sheet 100 according to this embodiment, the volume resistivity of the first conductive linear bodies 21 is smaller than the volume resistivity of the second conductive linear bodies 61 . Therefore, heat generation in the first conductive linear body 21 can be reduced, and heat generation in the second conductive linear body 61 can be increased. It should be noted that the heat generated by the second conductive linear body 61 can more appropriately heat the portion to be heated.

In the wiring sheet 100 according to the present embodiment, since the resistance value is different between any of the second conductive linear bodies 61 between the intersections, it is possible to change the amount of current between the intersections. can. By changing the amount of current between intersections, the amount of heat generated can be adjusted for each location on the sheet plane, so the temperature can be set for each location on the sheet plane.

Here, as a method for changing the resistance value between the second conductive linear bodies 61 between the intersections, for example, the following method can be used.
For example, as shown in FIG. 2, the spacing between any of the first conductive linear bodies 21 may be different.
When the intervals L1 of the first conductive linear bodies 21 are different, the lengths of the second conductive linear bodies 61 between the intersections are also different. In that case, if the material and thickness of the second conductive linear bodies 61 are the same, the resistance values of the second conductive linear bodies 61 between the intersections will be different. Then, as shown in FIG. 2, when the interval L1 between the first conductive linear bodies 21 becomes longer toward the end, the resistance value of the second conductive linear body 61 between the intersections is becomes higher as it approaches . Therefore, the amount of current flowing through the second conductive linear body 61 between the intersections becomes smaller toward the ends.

As shown in FIG. 3, any one of the second conductive linear bodies 61 may have a different thickness.
The resistance value of the second conductive linear body 61 decreases as the thickness (diameter) D2 of the second conductive linear body 61 increases if the material is the same. Then, as shown in FIG. 3, when the thickness of the second conductive linear body 61 becomes thicker toward the central portion, the resistance value of the second conductive linear body 61 between the intersections is It gets lower the closer you get to the edge. Therefore, the amount of current flowing through the second conductive linear body 61 between the intersections increases toward the central portion.

The material may be different between any of the second conductive linear bodies 61 .
The resistance value of the second conductive linear body 61 can be changed according to the material by changing the material. For example, the higher the volume resistivity of the material used for the second conductive linear bodies 61, the higher the resistance value of the second conductive linear bodies 61 between the intersections.

(Base material)
The first substrate 1 can support the first pseudo-sheet structure 2 directly or indirectly. The second substrate 5 can support the second pseudo-sheet structure 6 directly or indirectly. In addition, the first base material 1 and the second base material 5 do not necessarily have to be provided. The first base material 1 and the second base material 5 are members provided as needed.
Examples of the first base material 1 and the second base material 5 include synthetic resin film, paper, nonwoven fabric, cloth, and glass film. The first substrate 1 and the second substrate 5 may be transparent substrates or substrates having visibility. In this way, the wiring sheet 100 can be transparent or have visibility. Also, the first base material 1 and the second base material 5 may be stretchable base materials. For example, if the first base material 1 is a stretchable base material, the stretchability of the wiring sheet 100 can be ensured even when the first pseudo sheet structure 2 is provided on the first base material 1 .
As the first base material 1 and the second base material 5, a synthetic resin film, a nonwoven fabric, a cloth, or the like can be used.
Examples of synthetic resin films include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate film, and polybutylene terephthalate film. , polyurethane film, ethylene vinyl acetate copolymer film, ionomer resin film, ethylene/(meth)acrylic acid copolymer film, ethylene/(meth)acrylic acid ester copolymer film, polystyrene film, polycarbonate film, and polyimide film etc. In addition, stretchable substrates include these crosslinked films and laminated films.
Examples of nonwoven fabrics include spunbond nonwoven fabrics, needle-punched nonwoven fabrics, meltblown nonwoven fabrics, spunlaced nonwoven fabrics, and the like. Fabrics include, for example, woven fabrics and knitted fabrics. Paper, non-woven fabric, and cloth as stretchable substrates are not limited to these.
The thicknesses of the first base material 1 and the second base material 5 are not particularly limited. The thickness of the first base material 1 and the second base material 5 is preferably 10 μm or more and 10 mm or less, more preferably 15 μm or more and 3 mm or less, and even more preferably 50 μm or more and 1.5 mm or less.

(pseudo sheet structure)
The first pseudo sheet structure 2 has a structure in which a plurality of first conductive linear bodies 21 are arranged at intervals. Also, the first pseudo sheet structure 2 is arranged in a plurality in a direction intersecting with the axial direction of the first conductive linear body 21 .
Similarly, the second pseudo sheet structure 6 has a structure in which a plurality of second conductive linear bodies 61 are arranged at intervals. The second pseudo sheet structure 6 has a structure in which a plurality of second conductive linear bodies 61 are arranged in a direction intersecting the axial direction of the second conductive linear bodies 61 .

The first conductive linear bodies 21 and the second conductive linear bodies 61 may be linear or wavy in a plan view of the wiring sheet 100 . Wave shapes include, for example, sine waves, rectangular waves, triangular waves, and sawtooth waves. For example, if the first pseudo-sheet structure 2 has such a structure, when the wiring sheet 100 is stretched in the axial direction of the first conductive linear bodies 21, the first conductive linear bodies 21 Disconnection can be suppressed.

The volume resistivity of the first conductive linear body 21 is preferably 1.0×10 ⁻⁹ Ω·m or more and 1.0×10 ⁻⁵ Ω·m or less, and preferably 5.0×10 ⁻⁹ Ω ·m or more and 5.0×10 ⁻⁶ Ω·m or less is more preferable. When the volume resistivity of the first conductive linear body 21 is within the above range, when the first conductive linear body 21 and the second conductive linear body 61 are electrically connected, the first conductive wire Heat generation in the shaped body 21 can be reduced, and heat generation in the second conductive linear body 61 can be increased.
The volume resistivity of the second conductive linear body 61 is preferably 1.0×10 ⁻⁹ Ω·m or more and 1.0×10 ⁻³ Ω·m or less, and preferably 1.0×10 ⁻⁸ Ω ·m or more and 1.0×10 ⁻⁴ Ω·m or less is more preferable. When the volume resistivity of the second conductive linear bodies 61 is within the above range, the surface resistance of the second pseudo-sheet structure 6 tends to decrease.
The measurement of the volume resistivity of the first conductive linear body 21 and the second conductive linear body 61 is as follows. Silver paste is applied to one end of the first conductive linear body 21 or the second conductive linear body 61 and a portion of 40 mm in length from the end, and the end and a portion of 40 mm in length from the end are coated. is measured, and the resistance value of the first conductive linear body 21 or the second conductive linear body 61 is obtained. Then, the cross-sectional area (unit: m ² ) of the first conductive linear body 21 or the second conductive linear body 61 is multiplied by the above resistance value, and the obtained value is divided into the above measured length (0. 04m) to calculate the volume resistivity of the first conductive linear body 21 or the second conductive linear body 61 .

The cross-sectional shape of the first conductive linear body 21 and the second conductive linear body 61 is not particularly limited, and may be polygonal, flat, elliptical, circular, or the like. From the viewpoint of compatibility with the first resin layer 3 and the second resin layer 7, the cross-sectional shape of the first conductive linear body 21 and the second conductive linear body 61 is elliptical or circular. is preferred.

When the cross sections of the first conductive linear body 21 and the second conductive linear body 61 are circular, the thickness (diameter) D1 of the first conductive linear body 21 and the second conductive linear body The thickness (diameter) D2 (see FIGS. 2 and 3) of the body 61 is preferably 5 μm or more and 200 μm or less. From the viewpoint of suppressing an increase in sheet resistance and improving heat generation efficiency and dielectric breakdown resistance of the wiring sheet 100, the diameter D1 of the first conductive linear body 21 and the diameter D2 of the second conductive linear body 61 are It is more preferably 8 μm or more and 150 μm or less, and even more preferably 12 μm or more and 100 μm or less.
When the cross sections of the first conductive linear body 21 and the second conductive linear body 61 are elliptical, it is preferable that the major axis be in the same range as the diameter D1 and the diameter D2.

The diameter D1 of the first conductive linear body 21 and the diameter D2 of the second conductive linear body 61 are determined by observing the first conductive linear body 21 and the second conductive linear body 61 using a digital microscope. Then, the diameters of the first conductive linear body 21 and the second conductive linear body 61 are measured at five randomly selected locations, and the average value is taken.

The interval L1 between the first conductive linear members 21 (see FIG. 2) and the interval L2 between the second conductive linear members 61 (see FIG. 3) are preferably 0.3 mm or more and 50 mm or less. It is more preferably 5 mm or more and 30 mm or less, and further preferably 0.8 mm or more and 20 mm or less.
If the distance between the first conductive linear bodies 21 or between the second conductive linear bodies 61 is within the above range, the conductive linear bodies are densely packed to some extent, so that the resistance of the pseudo sheet structure can be lowered. It is possible to improve the function of the wiring sheet 100 such as maintenance.

The interval L1 between the first conductive linear members 21 and the interval L2 between the second conductive linear members 61 are determined by using a digital microscope, for example, the first conductive linear members 21 of the first pseudo-sheet structure 2. Observe and measure the distance between two adjacent first conductive linear bodies 21 .
The interval between two adjacent first conductive linear bodies 21 is the length along the direction in which the first conductive linear bodies 21 are arranged, and It is the length between opposing portions of the body 21 (see FIG. 2). The interval L1 is the average value of the intervals between all adjacent first conductive linear members 21 when the first conductive linear members 21 are arranged at uneven intervals. In addition, the interval L2 is the average value of the intervals between all adjacent second conductive linear members 61 when the second conductive linear members 61 are arranged at uneven intervals.

The first conductive linear body 21 and the second conductive linear body 61 are not particularly limited, but may be linear bodies containing metal wires (hereinafter also referred to as "metal wire linear bodies"). good. Metal wires have high thermal conductivity, high electrical conductivity, high handling properties, and versatility. The metal wire linear body can greatly reduce the resistance, and even if the diameter of the metal wire linear body is extremely small, the electric current required for heat generation of the wiring sheet 100 can be applied. Thereby, the first conductive linear body 21 and the second conductive linear body 61 can be made difficult to be visually recognized. That is, when metal wire linear bodies are used as the first conductive linear bodies 21 and the second conductive linear bodies 61, the resistance values of the first pseudo-sheet structure bodies 2 and the second pseudo-sheet structure bodies 6 are reduced. In addition, it becomes easy to improve the light transmittance. Moreover, the wiring sheet 100 is likely to generate heat quickly. Furthermore, as described above, it is easy to obtain a filamentous body having a small diameter.
As the first conductive linear body 21 and the second conductive linear body 61, in addition to the metal wire linear body, a linear body containing carbon nanotubes and a thread are coated with a conductive coating. A linear body is mentioned.

The metallic wire linear body may be a linear body made of one metal wire, or may be a linear body made by twisting a plurality of metal wires.
Metal wires include metals such as copper, aluminum, tungsten, iron, molybdenum, nickel, titanium, silver, and gold, or alloys containing two or more metals (for example, steel such as stainless steel and carbon steel, brass, phosphorus bronze, zirconium-copper alloys, beryllium-copper, iron-nickel, nichrome, nickel-titanium, kanthal, hastelloy, and rhenium-tungsten, etc.). The metal wire may be plated with tin, zinc, silver, nickel, chromium, nickel-chromium alloy, solder, or the like, and the surface is coated with a carbon material, polymer, or the like, which will be described later. There may be. In particular, a wire containing one or more metals selected from tungsten, molybdenum, and alloys containing these is preferable from the viewpoint of low volume resistivity.
Metal wires also include metal wires coated with carbon materials. When the metal wire is coated with a carbon material, the metallic luster is reduced, making it easier to make the presence of the metal wire inconspicuous. Metal corrosion is also suppressed when the metal wire is coated with a carbon material.
Examples of the carbon material that coats the metal wire include amorphous carbon (eg, carbon black, activated carbon, hard carbon, soft carbon, mesoporous carbon, carbon fiber, etc.), graphite, fullerene, graphene, carbon nanotubes, and the like.

A linear body containing carbon nanotubes is, for example, a carbon nanotube forest (a growing body in which a plurality of carbon nanotubes are grown on a substrate so as to be oriented in the vertical direction to the substrate, and is called an “array”). It can be obtained by drawing carbon nanotubes in a sheet form from the end of the carbon nanotube, bundling the drawn carbon nanotube sheet, and then twisting the bundle of carbon nanotubes. In such a production method, a ribbon-like carbon nanotube linear body is obtained when twisting is not applied during twisting, and a thread-like linear body is obtained when twisting is applied. A ribbon-shaped carbon nanotube linear body is a linear body that does not have a structure in which carbon nanotubes are twisted. Alternatively, a carbon nanotube linear body can be obtained by spinning a carbon nanotube dispersion. Production of carbon nanotube linear bodies by spinning can be performed, for example, by the method disclosed in US Patent Application Publication No. 2013/0251619 (Japanese Patent Application Laid-Open No. 2012-126635). From the viewpoint of obtaining a uniform diameter of the carbon nanotube linear body, it is desirable to use a filamentous carbon nanotube linear body. It is preferable to obtain a filamentous carbon nanotube linear body by The carbon nanotube linear body may be a linear body in which two or more carbon nanotube linear bodies are woven together. Further, the carbon nanotube linear body may be a linear body in which a carbon nanotube and another conductive material are combined (hereinafter also referred to as a "composite linear body").

As a composite linear body, for example, (1) a carbon nanotube linear body in which carbon nanotubes are pulled out in a sheet form from the ends of a carbon nanotube forest, the pulled out carbon nanotube sheets are bundled, and then the bundles of carbon nanotubes are twisted. In the process of obtaining a composite linear body in which a single metal or metal alloy is supported on the surface of a carbon nanotube forest, sheet or bundle, or twisted linear body by vapor deposition, ion plating, sputtering, wet plating, etc. , (2) a composite linear body in which a bundle of carbon nanotubes is twisted together with a linear body of a single metal or a linear body or a composite linear body of a metal alloy, (3) a linear body of a single metal or a metal alloy Composite linear bodies obtained by weaving linear bodies or composite linear bodies and carbon nanotube linear bodies or composite linear bodies, and the like. In the composite linear body of (2), when twisting the bundle of carbon nanotubes, a metal may be supported on the carbon nanotubes in the same manner as in the composite linear body of (1). The composite linear body of (3) is a composite linear body obtained by knitting two linear bodies. As long as linear bodies are included, three or more carbon nanotube linear bodies, linear bodies made of a single metal, linear bodies made of a metal alloy, or composite linear bodies may be woven together.
Examples of the metal of the composite linear body include simple metals such as gold, silver, copper, iron, aluminum, nickel, chromium, tin, and zinc, and alloys containing at least one of these simple metals (copper-nickel- phosphorus alloys, copper-iron-phosphorus-zinc alloys, etc.).

The first conductive linear body 21 and the second conductive linear body 61 may be linear bodies in which a thread is coated with a conductive coating. The yarn includes yarn spun from a resin such as nylon or polyester. Threads also include threads such as metal fibers, carbon fibers, or fibers of ion-conducting polymers. Examples of conductive coatings include coatings of metals, conductive polymers, carbon materials, and the like. The conductive coating can be formed by plating, vapor deposition, or the like. A linear body in which a thread is coated with a conductive coating can improve the conductivity of the linear body while maintaining the flexibility of the thread. That is, it becomes easy to reduce the resistance of the first pseudo-seat structure 2 and the second pseudo-seat structure 6 .

From the viewpoint of suppressing the contact resistance between the first conductive linear body 21 and the first electrode 41 and the second electrode 42, the first conductive linear body 21 is preferably plated with gold. Since the first conductive linear body 21 is plated with gold, the resistance value of the first pseudo sheet structure 2 is stabilized, so that uneven heat generation can be easily suppressed. From the same point of view, the second conductive linear body 61 is also preferably plated with gold.

(resin layer)
The first resin layer 3 and the second resin layer 7 are layers containing resin. The first pseudo-sheet structure 2 can be directly or indirectly supported by the first resin layer 3 . The first resin layer 3 and the second resin layer 7 may not necessarily be provided. The first resin layer 3 and the second resin layer 7 are members provided as needed. Moreover, the second pseudo sheet structure 6 can be directly or indirectly supported by the second resin layer 7 . The first resin layer 3 and the second resin layer 7 are preferably layers containing an adhesive. For example, when forming the first pseudo sheet structure 2 on the first resin layer 3 , the adhesive facilitates the attachment of the first conductive linear bodies 21 to the first resin layer 3 .

The first resin layer 3 and the second resin layer 7 may be layers made of a resin that can be dried or cured. As a result, sufficient hardness is imparted to the first resin layer 3 and the second resin layer 7 to protect the first pseudo-sheet structure 2 and the second pseudo-sheet structure 6, and the first resin layer 3 and the second The resin layer 7 also functions as a protective film. Moreover, the first resin layer 3 and the second resin layer 7 after curing or drying have impact resistance, and can suppress deformation of the wiring sheet 100 due to impact.

The first resin layer 3 and the second resin layer 7 are preferably curable with energy rays such as ultraviolet rays, visible energy rays, infrared rays, or electron beams in that they can be easily cured in a short time. The term "energy ray curing" includes heat curing by heating using energy rays.

The adhesive contained in the first resin layer 3 and the second resin layer 7 is a thermosetting adhesive that hardens with heat, a so-called heat-seal type adhesive that adheres with heat, and an adhesive that develops sticking properties when wet. Also included are agents and the like. However, from the viewpoint of ease of application, it is preferable that the first resin layer 3 and the second resin layer 7 are energy ray-curable. Examples of energy ray-curable resins include compounds having at least one polymerizable double bond in the molecule, and acrylate compounds having a (meth)acryloyl group are preferred.

Examples of the acrylate compounds include chain aliphatic skeleton-containing (meth)acrylates (trimethylolpropane tri(meth)acrylate, tetramethylolmethane tetra(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra( meth)acrylate, dipentaerythritol monohydroxypenta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, 1,4-butylene glycol di(meth)acrylate, and 1,6-hexanediol di(meth)acrylate, etc.) , cycloaliphatic skeleton-containing (meth)acrylates (dicyclopentanyl di(meth)acrylate, dicyclopentadiene di(meth)acrylate, etc.), polyalkylene glycol (meth)acrylates (polyethylene glycol di(meth)acrylate, etc.) , oligoester (meth)acrylates, urethane (meth)acrylate oligomers, epoxy-modified (meth)acrylates, polyether (meth)acrylates other than the above polyalkylene glycol (meth)acrylates, and itaconic acid oligomers.

The weight average molecular weight (Mw) of the energy ray-curable resin is preferably 100 or more and 30,000 or less, more preferably 300 or more and 10,000 or less.

The energy ray-curable resin contained in the adhesive composition may be of one type or two or more types, and when two or more types are used, the combination and ratio thereof can be arbitrarily selected. Furthermore, it may be combined with a thermoplastic resin, which will be described later, and the combination and ratio can be arbitrarily selected.

The first resin layer 3 and the second resin layer 7 may be adhesive layers formed from an adhesive (pressure-sensitive adhesive). The adhesive for the adhesive layer is not particularly limited. Examples of adhesives include acrylic adhesives, urethane adhesives, rubber adhesives, polyester adhesives, silicone adhesives, and polyvinyl ether adhesives. Among these, the adhesive is preferably at least one selected from the group consisting of an acrylic adhesive, a urethane adhesive, and a rubber adhesive, and more preferably an acrylic adhesive.

Examples of acrylic pressure-sensitive adhesives include polymers containing structural units derived from alkyl (meth)acrylates having straight-chain alkyl groups or branched-chain alkyl groups (that is, polymers obtained by polymerizing at least alkyl (meth)acrylates ), an acrylic polymer containing structural units derived from a (meth)acrylate having a cyclic structure (that is, a polymer obtained by polymerizing at least a (meth)acrylate having a cyclic structure), and the like. Here, "(meth)acrylate" is used as a term indicating both "acrylate" and "methacrylate", and the same applies to other similar terms.

When the acrylic polymer is a copolymer, the form of copolymerization is not particularly limited. The acrylic copolymer may be block copolymer, random copolymer or graft copolymer.

The acrylic copolymer may be crosslinked with a crosslinking agent. Examples of the cross-linking agent include known epoxy-based cross-linking agents, isocyanate-based cross-linking agents, aziridine-based cross-linking agents, and metal chelate-based cross-linking agents. When cross-linking an acrylic copolymer, a hydroxyl group or a carboxyl group that reacts with these cross-linking agents should be introduced into the acrylic copolymer as a functional group derived from the monomer component of the acrylic polymer. can be done.

When the first resin layer 3 and the second resin layer 7 are formed from an adhesive, the first resin layer 3 and the second resin layer 7 further contain the energy ray-curable resin described above in addition to the adhesive. You may have Further, when an acrylic pressure-sensitive adhesive is applied as the pressure-sensitive adhesive, the energy-ray-curable components include a functional group that reacts with a functional group derived from a monomer component in the acrylic copolymer, and an energy-ray-polymerizable functional group. A compound having both groups in one molecule may be used. The reaction between the functional group of the compound and the functional group derived from the monomer component in the acrylic copolymer enables the side chain of the acrylic copolymer to be cured by irradiation with energy rays. Even when the pressure-sensitive adhesive is not an acrylic pressure-sensitive adhesive, a component having an energy ray-polymerizable side chain may be used as a polymer component other than the acrylic polymer.

The thermosetting resin used for the first resin layer 3 and the second resin layer 7 is not particularly limited, and specific examples include epoxy resin, phenol resin, melamine resin, urea resin, polyester resin, urethane resin, and acrylic resin. Examples include resins, benzoxazine resins, phenoxy resins, amine compounds, acid anhydride compounds, and the like. These can be used individually by 1 type or in combination of 2 or more types. Among these, epoxy resins, phenol resins, melamine resins, urea resins, amine compounds and acid anhydride compounds are preferably used from the viewpoint of being suitable for curing using imidazole curing catalysts, and are particularly excellent. At least one selected from the group consisting of epoxy resins, phenolic resins, mixtures thereof, or epoxy resins and phenolic resins, melamine resins, urea resins, amine-based compounds, and acid anhydride-based compounds from the viewpoint of exhibiting curability. Preference is given to using mixtures with seeds.

The moisture-curable resin used for the first resin layer 3 and the second resin layer 7 is not particularly limited, and examples thereof include urethane resins, modified silicone resins, etc., which are resins in which isocyanate groups are generated by moisture.

When an energy ray-curable resin is used as the resin used for the first resin layer 3 and the second resin layer 7, it is preferable to use a photopolymerization initiator or the like. Moreover, when using a thermosetting resin as the resin used for the first resin layer 3 and the second resin layer 7, it is preferable to use a thermal polymerization initiator or the like. In the first resin layer 3 and the second resin layer 7, a photopolymerization initiator, a thermal polymerization initiator, or the like is used to form a crosslinked structure in the first resin layer 3 and the second resin layer 7, thereby forming a first pseudo It becomes possible to protect the seat structure 2 and the second pseudo seat structure 6 more firmly.

Photopolymerization initiators include benzophenone, acetophenone, benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, benzoin benzoic acid, benzoin methyl benzoate, benzoin dimethyl ketal, 2,4-diethylthioxanthone, 1 -hydroxycyclohexylphenyl ketone, benzyldiphenylsulfide, tetramethylthiuram monosulfide, azobisisobutyronitrile, 2-chloroanthraquinone, diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, and bis(2,4,6) -trimethylbenzoyl)-phenyl-phosphine oxide and the like.

Thermal polymerization initiators include hydrogen peroxide, peroxodisulfates (ammonium peroxodisulfate, sodium peroxodisulfate, potassium peroxodisulfate, etc.), azo compounds (2,2'-azobis(2-amidinopropane) di hydrochloride, 4,4′-azobis(4-cyanovaleric acid), 2,2′-azobisisobutyronitrile, and 2,2′-azobis(4-methoxy-2,4-dimethylvaleronitrile), etc.) , and organic peroxides (benzoyl peroxide, lauroyl peroxide, peracetic acid, persuccinic acid, di-t-butyl peroxide, t-butyl hydroperoxide, cumene hydroperoxide, etc.).

These polymerization initiators can be used singly or in combination of two or more.
When forming a crosslinked structure using these polymerization initiators, the amount used is 0.1 mass parts with respect to 100 mass parts of at least one of the energy ray-curable resin and the thermosetting resin. It is preferably from 1 to 100 parts by mass, more preferably from 1 to 100 parts by mass, and even more preferably from 1 to 10 parts by mass.

The first resin layer 3 and the second resin layer 7 may be layers made of, for example, a thermoplastic resin composition instead of being curable. By including a solvent in the thermoplastic resin composition, the thermoplastic resin layer can be softened. This makes it easy to attach the first conductive linear bodies 21 to the first resin layer 3 when forming the first pseudo sheet structure 2 on the first resin layer 3 , for example. On the other hand, by volatilizing the solvent in the thermoplastic resin composition, the thermoplastic resin layer can be dried and solidified.

Examples of thermoplastic resins include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinyl acetate, polyurethane, polyether, polyethersulfone, polyimide and acrylic resin.
Examples of solvents include alcohol-based solvents, ketone-based solvents, ester-based solvents, ether-based solvents, hydrocarbon-based solvents, halogenated alkyl-based solvents, and water.

The first resin layer 3 and the second resin layer 7 may contain an inorganic filler. By containing the inorganic filler, the hardness of the first resin layer 3 and the second resin layer 7 after curing can be further improved.

Examples of inorganic fillers include inorganic powders (for example, powders of silica, alumina, talc, calcium carbonate, titanium white, red iron oxide, silicon carbide, and boron nitride), beads obtained by spheroidizing inorganic powders, single crystal fibers, and glass fiber. Among these, silica fillers and alumina fillers are preferred as inorganic fillers. An inorganic filler may be used individually by 1 type, and may use 2 or more types together.

The first resin layer 3 and the second resin layer 7 may contain other components. Other components include, for example, organic solvents, flame retardants, tackifiers, ultraviolet absorbers, antioxidants, preservatives, antifungal agents, plasticizers, antifoaming agents, and well-known additives such as wettability modifiers. agents.

The thicknesses of the first resin layer 3 and the second resin layer 7 are determined according to the use of the wiring sheet 100. For example, from the viewpoint of adhesion, the thickness of the first resin layer 3 and the second resin layer 7 is preferably 3 μm or more and 150 μm or less, more preferably 5 μm or more and 100 μm or less.

(electrode)
The first electrode 41 and the second electrode 42 are used to supply current to the first conductive linear body 21 . The first electrode 41 and the second electrode 42 are paired. Also, the first electrode 41 is electrically connected to one or more of the first conductive linear bodies 21 . The second electrode 42 is electrically connected to one of the first conductive linear bodies 21 that is not electrically connected to the first electrode 41 . The plurality of arranged first conductive linear bodies 21 are preferably in contact with the first electrodes 41 and the second electrodes 42 alternately. With such a configuration, in a plan view of the wiring sheet 100, the intersection points at which the first conductive linear bodies 21 and the second conductive linear bodies 61 intersect can be arranged without variation.
The 1st electrode 41 and the 2nd electrode 42 can be formed using a well-known electrode material. Examples of electrode materials include conductive paste (silver paste, etc.), metal foil (copper foil, etc.), metal wire, and the like. When the electrode material is a metal wire, the number of metal wires may be one, but preferably two or more.

When the electrode material is a metal foil or metal wire, the metal of the metal foil or metal wire includes metals such as copper, aluminum, tungsten, iron, molybdenum, nickel, titanium, silver, and gold, or two metals. alloys containing more than one species (eg, steels such as stainless steel, carbon steel, brass, phosphor bronze, zirconium-copper alloys, beryllium-copper, iron-nickel, nichrome, nickel-titanium, kanthal, Hastelloy, and rhenium-tungsten). Also, the metal foil or metal wire may be plated with gold, tin, zinc, silver, nickel, chromium, nickel-chromium alloy, solder, or the like.

The width of one of the first electrode 41 and the second electrode 42 is preferably 10 mm or less, more preferably 3000 μm or less, and more preferably 1500 μm or less in a plan view of the wiring sheet 100. More preferred. When one electrode is a metal wire, the width of the electrode is the diameter of the metal wire, and when two or more metal wires are used, the width of one electrode is the diameter of each metal wire. It means peace.

The thickness of the first electrode 41 and the second electrode 42 is preferably 2 µm or more and 200 µm or less, more preferably 2 µm or more and 170 µm or less, and even more preferably 10 µm or more and 150 µm or less. If the thicknesses of the first electrode 41 and the second electrode 42 are within the above range, the electric conductivity is high and the resistance is low, and the resistance value with the pseudo sheet structure can be kept low. Moreover, sufficient strength as an electrode can be obtained. In addition, when the electrode is a metal wire, the thickness of the electrode is the diameter of the metal wire.

(Manufacturing method of wiring sheet)
The method for manufacturing the wiring sheet 100 according to this embodiment is not particularly limited. The wiring sheet 100 can be manufactured, for example, by the following steps.
First, a composition for forming the first resin layer 3 is applied onto the first base material 1 to form a coating film. Next, the coating film is dried to produce the first resin layer 3 . Next, the first pseudo sheet structure 2 is formed by arranging the first conductive linear bodies 21 on the first resin layer 3 . For example, in a state in which the first resin layer 3 with the first base material 1 is arranged on the outer peripheral surface of the drum member, the first conductive linear body 21 is spirally applied onto the first resin layer 3 while rotating the drum member. shape. After that, the bundle of the spirally wound first conductive linear body 21 is cut along the axial direction of the drum member. As a result, the first pseudo sheet structure 2 is formed and placed on the first resin layer 3 . Then, the first resin layer 3 with the first substrate 1 on which the first pseudo sheet structure 2 is formed is taken out from the drum member to obtain the first sheet-like conductive member. According to this method, for example, while rotating the drum member, the first pseudo-sheet structure 2 is moved by moving the feeding portion of the first conductive linear body 21 along the direction parallel to the axis of the drum member. It is easy to adjust the interval L1 between the first conductive linear bodies 21 adjacent to each other.
Next, the first electrode 41 and the second electrode 42 are attached to both ends of the first conductive linear body 21 in the first pseudo sheet structure 2 of the sheet-like conductive member. At this time, the first electrode 41 is electrically connected to one or more of the first conductive linear bodies 21 . The second electrode 42 is electrically connected to one of the first conductive linear bodies 21 that is not electrically connected to the first electrode 41 . Therefore, the first conductive linear body 21 may be partly cut to shorten it, or an insulating tape may be pasted on one of both ends of the first conductive linear body 21 .
Next, a second sheet-like conductive member comprising a second base material 5, a second pseudo sheet structure 6, and a second resin layer 7 is prepared in the same manner as in the method for producing the first sheet-like conductive member described above. make.
Next, a second sheet-like conductive member is arranged on the first sheet-like conductive member provided with the first electrode 41 and the second electrode 42 .
The wiring sheet 100 can be produced as described above.

(Action and effect of the first embodiment)
According to this embodiment, the following effects can be obtained.
(1) In the wiring sheet 100, since the resistance value is different between any of the second conductive linear bodies 61 between the intersections, the amount of current can be changed between the intersections.

[Second embodiment]
Next, a second embodiment of the present invention will be described based on the drawings. The present invention is not limited to the content of this embodiment. In the drawings, some parts are enlarged or reduced for ease of explanation.
In the second embodiment, the method of providing the first electrode 41 and the second electrode 42 is different from the first embodiment.
In the following description, the differences from the first embodiment will be mainly described, and overlapping descriptions will be omitted or simplified. The same reference numerals are given to the same configurations as in the first embodiment, and the explanations thereof are omitted or simplified.

In this embodiment, as shown in FIG. 5, an insulating member 8 is provided at one end of the first conductive linear body 21 . Since the insulating member 8 is provided between the first conductive linear body 21 and the first electrode 41 in the second and fourth from the left side of the first conductive linear body 21, the One conductive linear body 21 and first electrode 41 are not electrically connected. On the other hand, among the first conductive linear bodies 21, the insulating members 8 are provided between the first conductive linear bodies 21 and the second electrodes 42 on the first, third and fifth from the left side. Therefore, the first conductive linear body 21 and the second electrode 42 are not electrically connected.
Thus, the first electrode 41 is electrically connected to the first, third, and fifth from the left side of the first conductive linear body 21 . The second electrode 42 is electrically connected to the second and fourth wires from the left side of the first conductive linear body 21 that are not electrically connected to the first electrode 41 .
With such a structure, unlike the wiring sheet 100 according to the above-described first embodiment, the first electrodes 41 can be made to have the first conductivity without shortening a part of the first conductive linear bodies 21 . It can be electrically connected to a part of the linear body 21, and the second electrode 42 is electrically connected to the first conductive linear body 21 that is not electrically connected to the first electrode 41. can connect to
As the insulating member 8, a known insulating tape or the like can be appropriately used, and for example, a polyimide tape can be used.

(Action and effect of the second embodiment)
According to this embodiment, in addition to the effect (1) in the first embodiment, the following effect (2) can be achieved.
(2) The first electrode 41 can be electrically connected to a part of the first conductive linear body 21 without shortening the part of the first conductive linear body 21, and The electrodes 42 can be electrically connected to those of the first conductive wires 21 that are not electrically connected to the first electrodes 41 .

[Modification of Embodiment]
The present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.
For example, in the above-described embodiment, the wiring sheet 100 includes the first base material 1 and the second base material 5, but is not limited to this. For example, the wiring sheet 100 does not have to include the first base material 1 and the second base material 5 . In such a case, the first resin layer 3 or the second resin layer 7 can be used to attach the wiring sheet 100 to the adherend.

DESCRIPTION OF SYMBOLS 1... First base material 2... First pseudo-sheet structure 21... First conductive linear body 3... First resin layer 41... First electrode 42... Second electrode 5... Second group Material 6... Second pseudo sheet structure 61... Second conductive linear body 7... Second resin layer 8... Insulating member 100... Wiring sheet.

Claims

a first pseudo-sheet structure in which a plurality of first conductive linear bodies are arranged at intervals;
a first electrode electrically connected to one or more of the first conductive linear bodies;
a second electrode paired with the first electrode and electrically connected to one of the first conductive linear bodies that is not electrically connected to the first electrode;
A wiring sheet comprising a second pseudo-sheet structure in which a plurality of second conductive linear bodies are arranged at intervals,
The volume resistivity of the first conductive linear body is smaller than the volume resistivity of the second conductive linear body,
In a plan view of the wiring sheet, the first conductive linear bodies and the second conductive linear bodies intersect at respective intersections,
the first conductive linear body and the second conductive linear body are electrically connected at the intersection;
Between any of the second conductive linear bodies between the intersections, the resistance value is different.
wiring sheet.
In the wiring sheet according to claim 1,
thickness is different between any of the second conductive linear bodies;
wiring sheet.
In the wiring sheet according to claim 1 or claim 2,
The material is different between any of the second conductive linear bodies,
wiring sheet.
In the wiring sheet according to claim 1 or claim 2,
Between any of the first conductive linear bodies, the spacing is different,
wiring sheet.
In the wiring sheet according to claim 1 or claim 2,
The first conductive linear body and the second conductive linear body are gold-plated linear bodies,
wiring sheet.