Conductive yarn-shaped wiring, biological information measurement device, and manufacturing method of conductive yarn-shaped wiring

Abstract

To provide a conductive yarn-shaped wiring having excellent conductivity and wear resistance while maintaining flexibility.SOLUTION: A conductive yarn-shaped wiring according to the present invention includes a yarn-shaped member having conductivity, and an adhesive covering layer covering the yarn-shaped member. The adhesive covering layer includes a conductive material, and an adhesive resin containing the conductive material.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a conductive thread-like wiring, a biological information measuring device, and a method for manufacturing a conductive thread-like wiring. [Background technology]

[0002] In fields such as healthcare and life sciences, biological information measuring devices such as biosensors are used to measure biological information such as electrocardiogram waveforms, pulse waves, electroencephalograms, and electromyography. In the biological information measuring device, electrical signals obtained from detection devices such as electrodes and strain sensors of the biological information measuring device are transmitted to an electronic device such as a circuit board via conductive wiring arranged on a substrate.

[0003] Since biological information measuring devices are mainly used in contact with the surface of the skin, the wiring used in the biological information measuring devices needs to be flexible so that the biological signals detected by the detection device can be sent to the electronic device even if the surface of the skin changes. The wiring used in the substrate of the biological information measuring device is made of metal such as silver, copper, or aluminum, but metal wiring is hard and easily peels off from the substrate.

[0004] Therefore, as wiring used in biological information measuring devices, for example, a braided conductor in which a plurality of conductive wires are braided into a tubular shape or the like has been disclosed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-75607 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the braided conductor of Patent Document 1 has the problem that, because it is a braid formed by bundling multiple linear materials, the surface is hard and it is difficult to actually achieve sufficient flexibility. Also, the braided conductor of Patent Document 1 has the problem that the linear materials are easily unraveled when the surface comes into contact with and rubs against external members, etc., and the abrasion resistance is insufficient.

[0007] An object of one aspect of the present invention is to provide a conductive thread-like wiring that is excellent in conductivity and abrasion resistance while maintaining flexibility. [Means for solving the problem]

[0008] One aspect of the present invention is a conductive filament-like member; an adhesive coating layer that coats the thread-like member; Equipped with The adhesive coating layer is a conductive thread-like wiring having a conductive material and an adhesive resin containing the conductive material. [Effects of the Invention]

[0009] One aspect of the conductive thread-like wiring according to the present invention has excellent conductivity and abrasion resistance while maintaining flexibility. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a partial perspective view showing an example of a conductive thread-like wiring according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view of FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Figure 4] FIG. 1 illustrates an example of the configuration of a biological information measuring device. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail. To facilitate understanding of the description, the same components in each drawing will be assigned the same reference numerals, and duplicate explanations will be omitted. The scale of each member in the drawings may differ from the actual scale. In this specification, unless otherwise specified, "to" indicating a range of values ​​means that the values ​​before and after it are included as the lower and upper limits.

[0012] <Conductive thread-like wiring> The conductive thread-like wire according to the present embodiment will be described. Fig. 1 is a partial perspective view showing an example of the conductive thread-like wire according to the present embodiment, Fig. 2 is a cross-sectional view taken along line II in Fig. 1, and Fig. 3 is a cross-sectional view taken along line II-II in Fig. 1. As shown in Figs. 1 and 2, the conductive thread-like wire 1 according to the present embodiment includes a plurality of thread-like members (thread-like bodies) 11 and an adhesive coating layer 12 that coats the plurality of thread-like members 11.

[0013] The present inventors have noticed that by coating the thread-like members 11 with an adhesive coating layer 12, the flexibility and conductivity of the thread-like members 11 are maintained, the adhesive coating layer 12 prevents the thread-like members 11 from coming into contact with the outside, and peeling of the adhesive coating layer 12 due to wear or the like is suppressed. The present inventors have found that a conductive thread-like wiring 1 in which the thread-like members 11 are coated with an adhesive coating layer 12 can exhibit excellent conductivity and wear resistance while maintaining the flexibility derived from the shape of the thread-like members 11.

[0014] The longitudinal resistance of the conductive thread-like wire 1 alone is preferably 100 Ω / cm to 2 kΩ / cm, more preferably 200 Ω / cm to 1.5 kΩ / cm, and even more preferably 30 Ω / cm to 1.2 kΩ / cm. If the resistance is 100 Ω / cm to 2 kΩ / cm, the conductive thread-like wire 1 can have sufficient conductivity for transmitting biosignals and the like.

[0015] The method for measuring the longitudinal resistance value of the conductive thread-like wiring 1 alone is not particularly limited, but for example, a method may be used in which both ends of the conductive thread-like wiring 1 are clamped with alligator clips so that the conductive thread-like wiring 1 has a predetermined length (e.g., 4 cm), and a predetermined voltage is applied using an impedance analyzer or the like.

[0016] The thickness (diameter) of the conductive thread-like wire 1 is not particularly limited and may be appropriately selected depending on the application. For example, it may be 0.1 mm to 2.0 mm, and preferably 0.2 mm to 1.0 mm. The thickness of the conductive thread-like wire 1 is a value expressed as the diameter of a circle equivalent to the thickness of the conductive thread-like wire 1. The thickness of the conductive thread-like wire 1 can be determined using a light scattering device, a laser microscope, a scanning electron microscope (SEM), or the like. For example, the conductive thread-like wire 1 is observed using an SEM or the like, and the lengths of a predetermined number of arbitrarily selected conductive thread-like wires 1 in a direction perpendicular to the longitudinal direction (the radial lengths of the conductive thread-like wires 1) are measured and the average value is calculated to determine the average diameter. The determined average diameter may be the thickness of the conductive thread-like wire 1.

[0017] [Thread-like member] The thread-like members 11 are electrically conductive and have a thread-like (fibrous) shape.

[0018] In order to cover all of the thread-like members 11 with the adhesive coating layer 12, it is preferable that the thread-like members 11 are arranged in a bundle as shown in FIG.

[0019] In a cross-sectional view of the conductive thread-like wiring 1 in the longitudinal direction, ten thread-like members 11 are arranged (see Figures 1 and 3), but the number of thread-like members 11 may be any number appropriate depending on the thickness of the thread-like members 11, the thickness of the conductive thread-like wiring 1, etc.

[0020] The thickness of the thread-like member 11 can be any thickness appropriate for the application, etc., and can be a thin thread, a thick thread, a strong thread, or a flexible thread. Note that the definition and measurement method of the thickness of the thread-like member 11 are the same as those of the conductive thread-like wire 1, and therefore details are omitted here.

[0021] The length of the thread-like member 11 is not particularly limited, and may be approximately the same as the overall length of the conductive thread-like wire 1.

[0022] The material of the thread-shaped member 11 is not particularly limited. Examples of the material of the thread-shaped member 11 include natural fibers and chemical fibers. The thread-shaped member 11 may be made of one type of fiber or may contain multiple types of fibers. The fibers may be dyed, or may have their surfaces modified.

[0023] The natural fibers may be fibers of plant origin, fibers of animal origin, or a mixture of these fibers.

[0024] Examples of plant-derived fibers include cotton and hemp.

[0025] Examples of animal-derived fibers include wool, silk, and feathers.

[0026] The chemical fibers may be synthetic fibers, semi-synthetic fibers, or inorganic fibers.

[0027] Synthetic fibers are fibers made from polymers obtained by polymerizing monomers. There are many different types of synthetic fibers, and they can be selected based on the intended use, processability, and other factors, without any particular limitations. Examples of synthetic fibers include polyamide, polyester, aramid, polyvinylidene chloride, polyvinyl chloride, polyvinyl alcohol (e.g., vinylon), polyacrylonitrile, polyethylene, polypropylene, polystyrene, polyphenylene sulfide, polyurethane, phenol, polyfluoroethylene, and polychlor. Examples of polyamides include nylon 6 and nylon 6,6. Examples of polyesters include polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyhexamethylene terephthalate, and polylactic acid.

[0028] Semi-synthetic fibers are fibers made from natural polymer compounds, such as acetate and rayon.

[0029] Examples of inorganic fibers include carbon fibers, glass fibers, and metal fibers. The surface of the inorganic fibers may be coated with a polymer material.

[0030] Examples of carbon fibers include PAN (polyacrylonitrile)-based carbon fibers and pitch-based carbon fibers.

[0031] Materials for the metal fibers include metals such as Au, Pt, Ag, Cu, Al, Ni, Si, Co, Zr, Ti, W, and steel, metal oxides such as Al2O3, NiO, SiO2, TiO2, Ti2O3, ZnO, ZrO2, WO3, and Y2O3, and carbides such as SiC, ZrC, Al4C3, CaC2, WC, TiC, HfC, VC, TaC, and NbC.

[0032] [Adhesive coating layer] As shown in FIG. 3, the adhesive coating layer 12 includes a conductive material 121 and an adhesive resin 122.

[0033] The conductive material 121 is contained in a dispersed state in the adhesive resin 122. As the conductive material 121, a carbon-based material, a conductive polymer, or the like is used.

[0034] Examples of carbon-based materials that can be used include graphite, carbon black (CB), carbon nanotubes (CNT), carbon nanohorns, and carbon fibers.

[0035] Examples of conductive polymers that can be used include polythiophene-based conductive polymers, polyaniline-based conductive polymers, polypyrrole-based conductive polymers, polyacetylene-based conductive polymers, polyphenylene-based conductive polymers, and derivatives thereof, and composites thereof, etc. These may be used alone or in combination of two or more.

[0036] Examples of polythiophene-based conductive polymers include polythiophene, poly3-methylthiophene, poly3-ethylthiophene, poly3-propylthiophene, poly3-butylthiophene, poly3-hexylthiophene, poly3-heptylthiophene, poly3-octylthiophene, poly3-decylthiophene, poly3-dodecylthiophene, poly3-octadecylthiophene, poly3-bromothiophene, poly3-chlorothiophene, poly3-iodothiophene, poly3-cyanothiophene, poly3-phenylthiophene, poly3,4-dimethylthiophene, poly3,4-dibutylthiophene, poly3-hydroxythiophene, poly3-methoxythiophene, poly3-ethoxythiophene, poly3-butoxythiophene, poly3-hexyloxythiophene, poly3-heptyloxythiophene, poly3-octyloxythiophene, poly3-decyloxythiophene, poly3-dodecyloxythiophene, and poly3 -octadecyloxythiophene, poly3,4-dihydroxythiophene, poly3,4-dimethoxythiophene, poly3,4-diethoxythiophene, poly3,4-dipropoxythiophene, poly3,4-dibutoxythiophene, poly3,4-dihexyloxythiophene, poly3,4-diheptyloxythiophene, poly3,4-dioctyloxythiophene, poly3,4-didecyloxythiophene, poly3,4-didodecyloxythiophene, poly3,4-ethylenedioxythiophene (also referred to as "PEDOT"), poly3,4-propylenedioxythiophene, poly3,4-butenedioxythiophene, poly3-methyl-4-methoxythiophene, poly3-methyl-4-ethoxythiophene, poly3-carboxythiophene, poly3-methyl-4-carboxythiophene, poly3-methyl-4-carboxyethylthiophene, and poly3-methyl-4-carboxybutylthiophene.

[0037] Examples of polyanionic conductive polymers include polymers having sulfonic acid groups, such as polystyrene sulfonic acid (also referred to as "PSS"), polyvinyl sulfonic acid, polyallyl sulfonic acid, polyacrylic sulfonic acid, polymethacrylic sulfonic acid, poly(2-acrylamido-2-methylpropanesulfonic acid), polyisoprene sulfonic acid, polysulfoethyl methacrylate, poly(4-sulfobutyl methacrylate), and polymethacryloxybenzenesulfonic acid, as well as polymers having carboxylic acid groups, such as polyvinyl carboxylic acid, polystyrene carboxylic acid, polyallyl carboxylic acid, polyacrylic carboxylic acid, polymethacrylic carboxylic acid, poly(2-acrylamido-2-methylpropanecarboxylic acid), polyisoprene carboxylic acid, and polyacrylic acid. These may be used as homopolymers in which one type is polymerized alone, or as copolymers of two or more types. Among these polyanions, polymers having sulfonic acid groups are preferred because they can achieve higher conductivity, and polystyrene sulfonic acid is more preferred.

[0038] Examples of polypyrrole-based conductive polymers include polypyrrole, poly(N-methylpyrrole), poly(3-methylpyrrole), poly(3-ethylpyrrole), poly(3-n-propylpyrrole), poly(3-butylpyrrole), poly(3-octylpyrrole), poly(3-decylpyrrole), poly(3-dodecylpyrrole), poly(3,4-dimethylpyrrole), poly(3,4-dibutylpyrrole), poly(3-carboxypyrrole), poly(3-methyl-4-carboxypyrrole), poly(3-methyl-4-carboxyethylpyrrole), poly(3-methyl-4-carboxybutylpyrrole), poly(3-hydroxypyrrole), poly(3-methoxypyrrole), poly(3-ethoxypyrrole), poly(3-butoxypyrrole), poly(3-hexyloxypyrrole), and poly(3-methyl-4-hexyloxypyrrole).

[0039] Examples of polyacetylene-based conductive polymers include polyacetylenes having polar groups, such as polyphenylacetylene monoesters having an ester at the para-position of phenylacetylene, and polyphenylacetylene monoamides having an amide at the para-position of phenylacetylene.

[0040] Examples of polyphenylene-based conductive polymers include polyphenylene vinylene.

[0041] As these composites, a composite in which polythiophene is doped with polyaniline as a dopant is preferred. Among composites of polythiophene and polyaniline, it is more preferred to use PEDOT / PSS in which PEDOT is doped with PSS, because it has a lower contact impedance with a living body and high conductivity.

[0042] The content of the conductive polymer is preferably 0.20 wt% to 20 wt%, more preferably 2.5 wt% to 15 wt%, and even more preferably 3.0 wt% to 12 wt%, relative to 100 wt% of the adhesive coating layer. If the content is within the above preferred range relative to 100 wt% of the adhesive coating layer, the adhesive coating layer 12 can have excellent conductivity, toughness, and flexibility.

[0043] The conductive polymer may be used as an aqueous solution dissolved in a solvent. In this case, the solvent may be an organic solvent or an aqueous solvent. Examples of organic solvents include ketones such as acetone and methyl ethyl ketone (MEK); esters such as ethyl acetate; ethers such as propylene glycol monomethyl ether; and amides such as N,N-dimethylformamide. Examples of aqueous solvents include water; and alcohols such as methanol, ethanol, propanol, and isopropanol. Among these, it is preferable to use an aqueous solvent.

[0044] The adhesive resin contained in the adhesive coating layer 12 is used as a binder resin for the adhesive coating layer 12 .

[0045] The glass transition temperature Tg of the adhesive resin 122 is preferably −80° C. to −20° C., more preferably −75° C. to −25° C., and even more preferably −70° C. to −30° C. If the glass transition temperature Tg is −80° C. to −20° C., the adhesive resin 122 can maintain a soft state when the conductive thread-like wire 1 is in use.

[0046] The adhesive resin 122 may have a glass transition temperature Tg in the range of −80° C. to −20° C., and may be, for example, a water-dispersible adhesive, an acrylic resin, a urethane resin, a silicone resin, rubber, etc. Among these, the adhesive resin is preferably a water-dispersible adhesive.

[0047] As the water-dispersed adhesive, a water-based emulsion adhesive or the like can be used.

[0048] The aqueous emulsion adhesive has the function of improving the adhesiveness and flexibility of the adhesive coating layer 12. Therefore, by including an aqueous emulsion adhesive in the adhesive coating layer 12, the adhesive coating layer 12 can be made low elastic and can be improved in its ability to conform to the irregularities of the surface to which it is applied, such as the surface of a living body.

[0049] As the aqueous emulsion pressure-sensitive adhesive, it is preferable to use an acrylic emulsion pressure-sensitive adhesive.

[0050] The acrylic emulsion pressure-sensitive adhesive is preferably a silane emulsion pressure-sensitive adhesive containing a water-dispersible copolymer and an organic liquid component that is compatible with the water-dispersible copolymer.

[0051] The water-dispersible copolymer is a polymer obtained by copolymerizing a monomer mixture containing a (meth)acrylic acid alkyl ester with a silane-based monomer copolymerizable with the (meth)acrylic acid alkyl ester.

[0052] The monomer mixture containing a (meth)acrylic acid alkyl ester is a monomer mixture containing a (meth)acrylic acid alkyl ester as a main component, preferably containing 50 wt % to 100 wt % of a (meth)acrylic acid alkyl ester.

[0053] As the (meth)acrylic acid alkyl ester, a straight-chain or branched alkyl ester having an alkyl group carbon number of 1 to 15, preferably 1 to 9, is used. Specific examples include (meth)acrylic acid alkyl esters having a straight-chain or branched alkyl group, such as methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, n-nonyl (meth)acrylate, isononyl (meth)acrylate, decyl (meth)acrylate, undecyl (meth)acrylate, and tridecyl (meth)acrylate. These can be used alone or in combination of two or more.

[0054] The monomer mixture containing the (meth)acrylic acid alkyl ester may contain a carboxyl group-containing monomer copolymerizable with the (meth)acrylic acid alkyl ester.

[0055] The carboxyl group-containing monomer copolymerizable with the (meth)acrylic acid alkyl ester is not particularly limited as long as it is a polymerizable compound containing a carboxyl group in its structure and is copolymerizable with the (meth)acrylic acid alkyl ester. Examples of the carboxyl group-containing monomer copolymerizable with the (meth)acrylic acid alkyl ester include (meth)acrylic acid, itaconic acid, maleic acid, maleic anhydride, and 2-methacryloyloxyethyl succinic acid. Acrylic acid is particularly preferred.

[0056] From the viewpoint of hydrolysis of the silane-based monomer and adjustment of the resulting adhesiveness, the carboxyl group-containing monomer is preferably contained in an amount of 0.1 wt % to 10 wt % relative to 100 wt % of the monomer mixture containing the (meth)acrylic acid alkyl ester.

[0057] The silane monomer copolymerizable with (meth)acrylic acid alkyl esters is not particularly limited as long as it is a polymerizable compound having a silicon atom and is copolymerizable with (meth)acrylic acid alkyl esters. However, silane compounds having a (meth)acryloyl group, such as (meth)acryloyloxyalkylsilane derivatives, are preferred because of their excellent copolymerizability with (meth)acrylic acid alkyl esters. Examples of silane monomers include 3-(meth)acryloyloxypropyltrimethoxysilane, 3-(meth)acryloyloxypropyltriethoxysilane, 3-(meth)acryloyloxypropylmethyldimethoxysilane, and 3-(meth)acryloyloxypropylmethyldiethoxysilane. These silane monomers can be used alone or in combination of two or more.

[0058] Furthermore, other silane-based monomers that can be used include, for example, vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8-vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, and 10-acryloyloxydecyltriethoxysilane.

[0059] It is preferable that the silane-based monomer is copolymerized with the monomer mixture containing the (meth)acrylic acid alkyl ester in an amount of 0.005 wt % to 2 wt % relative to 100 wt % of the monomer mixture containing the (meth)acrylic acid alkyl ester.

[0060] By copolymerizing a silane monomer with a monomer mixture containing a (meth)acrylic acid alkyl ester, the silane compounds that serve as crosslinking points are uniformly distributed within the molecules of the resulting copolymer. As a result, the aqueous emulsion adhesive, despite being a water-dispersible type, has excellent cohesive strength because the inside and outside of the aqueous emulsion adhesive particles are uniformly crosslinked. The addition of an organic liquid component not only makes it less irritating to biological surfaces such as the skin, but also provides excellent fixation and sweat-resistant fixation.

[0061] The aqueous dispersion copolymer may be a copolymer of a monomer copolymerizable with a (meth)acrylic acid alkyl ester other than the above-mentioned silane-based monomer and carboxyl group-containing monomer, if necessary. The monomer copolymerizable with a (meth)acrylic acid alkyl ester other than the silane-based monomer and the carboxyl group-containing monomer can be used for the purposes of adjusting the cohesive strength of the adhesive coating layer 12 when the aqueous emulsion pressure-sensitive adhesive is formed into a sheet or the like, and improving compatibility with organic liquid components, and the amount used can be set as desired depending on the purpose by replacing part of the content of the (meth)acrylic acid alkyl ester.

[0062] Examples of monomers copolymerizable with (meth)acrylic acid alkyl esters other than silane-based monomers and carboxyl group-containing monomers include sulfoxyl group-containing monomers such as styrenesulfonic acid, allylsulfonic acid, sulfopropyl(meth)acrylate, (meth)acryloyloxynaphthalenesulfonic acid, and acrylamidomethylpropanesulfonic acid; hydroxyl group-containing monomers such as (meth)acrylic acid hydroxyethyl ester and (meth)acrylic acid hydroxypropyl ester; amide group-containing monomers such as (meth)acrylamide, dimethyl(meth)acrylamide, N-butylacrylamide, N-methylol(meth)acrylamide, and N-methylolpropane(meth)acrylamide; (meth)acrylic acid alkylaminoalkyl esters such as (meth)acrylic acid aminoethyl ester, (meth)acrylic acid dimethylaminoethyl ester, and (meth)acrylic acid tert-butylaminoethyl ester; and (meth)acrylic acid methoxy. Examples thereof include (meth)acrylic acid alkoxyalkyl esters such as (meth)acrylic acid ethyl ester and (meth)acrylic acid ethoxyethyl ester, (meth)acrylic acid methoxyethylene glycol ester, (meth)acrylic acid tetrahydrofurfuryl ester, (meth)acrylic acid methoxyethylene glycol ester, (meth)acrylic acid methoxydiethylene glycol ester, (meth)acrylic acid methoxypolyethylene glycol ester, and (meth)acrylic acid methoxypolypropylene glycol ester, as well as vinyl monomers such as (meth)acrylonitrile, vinyl acetate, vinyl propionate, N-vinyl-2-pyrrolidone, methylvinylpyrrolidone, vinylpyridine, vinylpiperidine, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinylpyrrole, vinylimidazole, vinylcaprolactam, vinyloxazole, and vinylmorpholine. These can be used alone or in combination of two or more.

[0063] The water-dispersible polymer can be prepared as a water dispersion of a (meth)acrylic acid alkyl ester copolymer, for example, by subjecting a mixture of a monomer mixture containing a (meth)acrylic acid alkyl ester and a silane-based monomer to conventional emulsion polymerization.

[0064] As the polymerization method, general batch polymerization, continuous dropping polymerization, divided dropping polymerization, etc. can be adopted, and the polymerization temperature may be, for example, 20°C to 100°C.

[0065] The polymerization initiator used in the polymerization is not particularly limited, and a general component used as a polymerization initiator can be used.

[0066] A chain transfer agent may be used in the polymerization to adjust the degree of polymerization. The chain transfer agent is not particularly limited, and a general component used as a chain transfer agent can be used.

[0067] In addition to the above-mentioned method, the water-dispersible copolymer may also be prepared by obtaining a copolymer of a monomer mixture containing a (meth)acrylic acid ester and a silane-based monomer by a method other than emulsion polymerization, and then dispersing the copolymer in water with an emulsifier.

[0068] The organic liquid component contained in the acrylic emulsion adhesive, when blended with the water-dispersible copolymer, not only maintains good adhesion to biological surfaces such as the skin, but also reduces damage and pain when peeled off from the biological surface.

[0069] The organic liquid component is preferably liquid at room temperature and has good compatibility with the water-dispersible copolymer. Here, "compatibility" refers to the state in which the organic liquid component is uniformly dissolved and incorporated into the water-dispersible copolymer, and separation cannot be confirmed visually.

[0070] Examples of organic liquid components include esters of monobasic or polybasic acids having 8 to 18 carbon atoms and branched alcohols having 14 to 18 carbon atoms, and esters of unsaturated fatty acids or branched acids having 14 to 18 carbon atoms and tetrahydric or lower alcohols.

[0071] Examples of esters of monobasic or polybasic acids having 8 to 18 carbon atoms with branched alcohols having 14 to 18 carbon atoms include isostearyl laurate, isocetyl myristate, octyldodecyl myristate, isostearyl palmitate, isocetyl stearate, octyldodecyl oleate, diisostearyl adipate, diisocetyl sebacate, trioleyl trimellitate, and triisocetyl trimellitate.

[0072] Examples of unsaturated fatty acids or branched acids having 14 to 18 carbon atoms include myristoleic acid, oleic acid, linoleic acid, linolenic acid, isopalmitic acid, and isostearic acid.

[0073] Examples of tetrahydric or lower alcohols include ethylene glycol, propylene glycol, glycerin, trimethylolpropane, pentaerythritol, and sorbitan.

[0074] The content of the organic liquid component can be appropriately set according to the type of water-dispersible copolymer and organic liquid component, and may be, for example, 20 wt % to 80 wt % relative to 100 wt % of the water-dispersible copolymer.

[0075] When the acrylic emulsion adhesive is a silane emulsion adhesive, specifically, a silane emulsion adhesive containing 2-ethylhexyl acrylate, methyl methacrylate, acrylic acid, and 3-methacryloxypropyltrimethoxysilane can be used as the acrylic emulsion adhesive.

[0076] The acrylic emulsion pressure-sensitive adhesive may be a two-component or three-component acrylic emulsion pressure-sensitive adhesive containing a monomer mixture containing a (meth)acrylic acid alkyl ester and a carboxyl group-containing monomer, and may contain a solvent and other components in appropriate amounts within the range that allows the solvent and other components to exhibit their performance.

[0077] The monomer mixture containing the (meth)acrylic acid alkyl ester contained in the two-component or three-component acrylic emulsion adhesive is similar to the monomer mixture containing the (meth)acrylic acid alkyl ester contained in the above-mentioned silane-based emulsion adhesive, so details are omitted.

[0078] The carboxyl group-containing monomer is preferably a carboxyl group-containing monomer copolymerizable with a (meth)acrylic acid alkyl ester. The carboxyl group-containing monomer copolymerizable with a (meth)acrylic acid alkyl ester is the same as the carboxyl group-containing monomer contained in the above-mentioned monomer mixture containing a (meth)acrylic acid alkyl ester, and therefore details thereof will be omitted.

[0079] Specifically, the two-component acrylic emulsion adhesive may be an adhesive containing 2-ethylhexyl acrylate, which is a monomer mixture containing a (meth)acrylic acid alkyl ester, and acrylic acid, which is a carboxyl group-containing monomer mixture.

[0080] Specifically, the three-component acrylic emulsion adhesive may be an adhesive containing 2-ethylhexyl acrylate and methyl methacrylate, which are a monomer mixture containing an alkyl (meth)acrylate ester, and acrylic acid, which is a carboxyl group-containing monomer mixture.

[0081] The average particle size of the aqueous emulsion adhesive is preferably 100 nm to 1.0 μm, more preferably 100 nm to 500 nm, and even more preferably 100 nm to 300 nm. When the average particle size is within the above preferred range, adhesive coating layer 12 can be provided with adhesive strength and water resistance.

[0082] The shape of the aqueous emulsion pressure-sensitive adhesive is not particularly limited, and may be, for example, spherical, ellipsoidal, spindle-like, crushed, plate-like, columnar, or the like.

[0083] The average particle size refers to the volume-average particle size based on the effective diameter. The average particle size is the particle size (median diameter) when the cumulative amount of particles, starting from the smallest, accounts for 50% of the volume on a particle size distribution curve obtained by measuring the particle size distribution of an emulsion pressure-sensitive adhesive or an acrylic emulsion pressure-sensitive adhesive using, for example, laser diffraction / scattering or dynamic light scattering.

[0084] The content of the aqueous emulsion adhesive is preferably 35 wt% to 90 wt%, more preferably 40 wt% to 85 wt%, and even more preferably 50 wt% to 80 wt%, relative to 100 wt% of the adhesive coating layer. When the content of the aqueous emulsion adhesive is within the above preferred range, adhesive strength and flexibility can be imparted to the adhesive coating layer 12, and a decrease in electrical conductivity can be suppressed.

[0085] The moisturizing agent contained in the adhesive coating layer 12 not only provides the adhesive coating layer 12 with a moisturizing effect, but also functions as a plasticizer and crystallizer for the conductive polymer, improving the conductivity of the adhesive coating layer 12 as well as improving its adhesive strength and flexibility.

[0086] Examples of moisturizing agents include polyol compounds such as glycerin, ethylene glycol, propylene glycol, sorbitol, and polymers thereof, and aprotic compounds such as N-methylpyrrolidone (NMP), dimethylformaldehyde (DMF), N-N'-dimethylacetamide (DMAc), and dimethyl sulfoxide (DMSO). These may be used alone or in combination. Among these, glycerin is preferred from the viewpoint of compatibility with other components.

[0087] The content of the humectant is preferably 4.0 wt% to 20.0 wt%, more preferably 5.0 wt% to 17.0 wt%, and even more preferably 7.0 wt% to 15.0 wt%, relative to 100 wt% of the adhesive coating layer (total amount of the adhesive coating layer 12). When the content of the humectant is within the above-mentioned preferred range, the adhesive strength of the adhesive coating layer 12 is improved, high adhesion to the skin surface can be maintained, and a decrease in resistance value can be suppressed. Furthermore, the adhesive coating layer 12 is prevented from absorbing water from the outside, suppressing swelling and increasing stickiness. Furthermore, the adhesive coating layer 12 is prevented from becoming hard and brittle, and is prevented from peeling off easily from the thread-like member 11.

[0088] The content of the moisturizing agent may be measured using commonly used analytical measuring equipment, such as gas chromatography (GC) or a thermogravimetric-differential thermal analyzer (TG-DTA) that simultaneously performs thermogravimetry (TG) and differential thermal analysis (DTA).

[0089] When using GC, for example, the adhesive coating layer 12 is heated to 150°C for 10 minutes, and the gas components (ppm by mass) released during this time are measured. Thereafter, the adhesive coating layer 12 is further heated to 240°C, and the gas components (ppm by mass) released are measured. The total value of the gas components at each temperature may then be calculated as the content of the moisturizing agent contained in the adhesive coating layer 12.

[0090] When using TG-DTA, for example, the adhesive coating layer 12 is heated to 50°C and the gas components (ppm by mass) released during this time are measured. Thereafter, the adhesive coating layer 12 is further heated to 300°C and the gas components (ppm by mass) released are measured. The total value of the gas components at each temperature may then be calculated as the content of the moisturizing agent contained in the adhesive coating layer 12.

[0091] As described above, the adhesive coating layer 12 may contain additives and the like as optional components.

[0092] When the conductive material is a conductive polymer, the additive neutralizes the conductive polymer, neutralizing it and improving its flexibility. When the conductive polymer is, for example, PEDOT-PSS, the additive forms an organic salt when neutralized with PSS, which is a strong acid, and can improve water absorption and make the material insoluble in water.

[0093] Preferred examples of the additive include imidazole compounds.

[0094] The imidazole compound is an organic structure having an imidazole group, and the imidazole group of the imidazole compound acts as an additive in the pH range of 3.5 to 6.5, for example.

[0095] The imidazole compound includes, for example, heterocyclic amines.

[0096] Examples of heterocyclic amines include imidazole, 2-methylimidazole, 2-propylimidazole, 2-undecylimidazole, 2-phenylimidazole, N-methylimidazole, 1-(2-hydroxyethyl)imidazole, 2-ethyl-4-methylimidazole, 1,2-dimethylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-cyanoethyl-2-methylimidazole, and 1-cyanoethyl- Examples of suitable imidazole compounds include 2-ethyl-4-methylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 1-acetylimidazole, 4,5-imidazoledicarboxylic acid, dimethyl 4,5-imidazoledicarboxylate, benzimidazole, 2-aminobenzimidazole, 2-aminobenzimidazole-2-sulfonic acid, 2-amino-1-methylbenzimidazole, 2-hydroxybenzimidazole, and 2-(2-pyridyl)benzimidazole. Among these, imidazole is preferred. The additive may be one of the above components that can be used as an imidazole compound, or a combination of two or more of them.

[0097] The content of the additive is preferably 0.5 wt% to 2.4 wt%, more preferably 0.7 wt% to 2.2 wt%, and even more preferably 0.8 wt% to 2.0 wt%, relative to 100 wt% of the adhesive coating layer.

[0098] When an acrylic resin, a urethane resin, a silicone resin, a rubber, or the like is used as a material for forming the adhesive coating layer 12, the commonly used acrylic resin, urethane resin, silicone resin, rubber, or the like can be used as long as the glass transition temperature Tg is within the range of -80°C to -20°C.

[0099] Examples of rubber include natural rubber (NR), butyl rubber (IIR), isoprene rubber (IR), ethylene-propylene rubber (EPDM), butadiene rubber (BR), urethane rubber (U), styrene-butadiene rubber (SBR), silicone rubber (Q), chloroprene rubber (CR), chlorosulfonated polyethylene rubber (CSM), acrylonitrile butadiene rubber (NBR), chlorinated polyethylene, acrylic rubber (ACM), epichlorohydrin rubber, and fluororubber (FKM). Among these, natural rubber is preferred from the viewpoint of strength, etc.

[0100] The amount of the adhesive coating layer 12 applied to the thread-like member 11 per unit length is preferably 100 mg / m or more, more preferably 145 mg / m or more, and even more preferably 155 mg / m or more. If the amount of coating is 100 mg / m or more, the adhesive coating layer 12 maintains the conductivity and flexibility of the conductive thread-like wire 1 and can be applied to the surface of the thread-like member 11 with a substantially uniform thickness. Furthermore, fusion between the thread-like members 11 can be suppressed.

[0101] The method for calculating the coating amount is not particularly limited, and any method that allows for the calculation of the coating amount may be used. For example, the coating amount can be calculated by subtracting the mass of the filamentous member 11 from the mass of the conductive filamentous wire 1 and dividing the result by the length of the conductive filamentous wire 1, as shown in (1) below. ((mass of conductive thread-like wiring 1−mass of thread-like member 11) / length of conductive thread-like wiring 1) (1)

[0102] There are no particular limitations on the method for producing the conductive thread-like wire 1, and any appropriate method can be used for production. An example of the method for producing the conductive thread-like wire 1 will be described.

[0103] For example, a conductive mixture liquid containing the conductive material 121 and the adhesive resin 122 is prepared (a conductive mixture liquid preparation step).

[0104] Next, the conductive compound liquid is applied to the surface of the thread-shaped member 11 (application step).

[0105] There are no particular limitations on the method for applying the conductive liquid mixture to the surface of the filamentous member 11, and any common application method can be used. Examples of methods for applying the conductive liquid mixture to the surface of the filamentous member 11 include an immersion method in which the filamentous member 11 is immersed in the conductive liquid mixture and a spray method in which the conductive liquid mixture is sprayed onto the filamentous member 11.

[0106] Next, the conductive compound liquid applied to the surface of the thread-shaped member 11 is dried (drying step).

[0107] The drying conditions are not particularly limited as long as they can dry the conductive liquid mixture, and the drying temperature, drying time, and drying method may be set arbitrarily and appropriately depending on the type and viscosity of the conductive liquid mixture, etc.

[0108] By drying the conductive mixture liquid, the surface of the thread-like member 11 is covered with an adhesive coating layer 12 containing a conductive material 121 and an adhesive resin 122. In this way, a conductive thread-like wire 1 is obtained.

[0109] As described above, the conductive thread-like wire 1 includes a thread-like member 11 and an adhesive coating layer 12, and the adhesive coating layer 12 contains a conductive material 121 in an adhesive resin 122. Because the thread-like member 11 has a thread-like shape, it has high flexibility and can maintain its flexibility even when coated with the adhesive coating layer 12. The thread-like member 11 can be made conductive due to its material, and the adhesive coating layer 12 is conductive because it contains the conductive material 121. Because the thread-like member 11 is coated with the adhesive coating layer 12, the adhesive coating layer 12 is prevented from peeling off from the thread-like member 11 even when it comes into contact with and rubs against external objects such as skin or other objects, and the adhesive coating layer 12 can impart conductivity to the surface of the thread-like member 11. Therefore, the conductive thread-like wire 1 can have excellent conductivity and abrasion resistance while maintaining flexibility.

[0110] The conductivity of the conductive thread-like wiring 1 can be evaluated by measuring the surface resistance value, resistance value, durability, etc. of the conductive thread-like wiring 1, for example.

[0111] (Measurement of surface resistance) Because the conductive thread-like wiring 1 is formed in a thread-like shape, it is difficult to measure the surface resistance. Therefore, alternative evaluations may be performed by forming the conductive thread-like wiring 1 into a sheet and measuring the surface resistance of the sheet. For example, a polyethylene terephthalate (PET) film is used as the thread-like member 11. A conductive compound liquid containing a conductive material 121 and an adhesive resin 122 is applied to a PET film surface-treated with a silicone-based release agent using an applicator or the like, and then the PET film is heated and dried in a dryer under specified heating conditions (e.g., 130°C, 3 minutes) to produce a conductive sheet. Next, sheet resistance is measured as the surface resistance of the conductive sheet by an eddy current measurement method using a general non-contact resistance measuring device in accordance with JIS Z 2316-1:2014. The measurement range may be a predetermined range on the main surface of the conductive sheet (e.g., a range of 0.5 mm to 150 mm on one side).

[0112] (Measurement of resistance value) Both ends of the conductive thread-like wiring 1 are clamped with alligator clips so that the length of the conductive thread-like wiring 1 is a predetermined length (for example, 4 cm), and a voltage of 1 V is applied using an impedance analyzer to measure the resistance value of the conductive thread-like wiring 1.

[0113] (durability) A predetermined voltage (e.g., 1 V) is applied to the conductive thread-like wiring 1 for a predetermined time (e.g., 10 seconds), and then the voltage is turned off for a predetermined time (e.g., 10 seconds). This cycle test is repeated a predetermined number of times (e.g., 100 times), and the resistance value is measured after the cycle test, and the change in resistance before and after the cycle test is measured. The change in resistance before and after the cycle test is used as an indicator of durability, and the durability of the conductive thread-like wiring 1 is evaluated.

[0114] (wear resistance) The conductive thread-like wires 1 can be rubbed with a paper cloth or the like, and the degree to which the adhesive coating layer 12 peels off from the conductive thread-like wires 1 can be observed for evaluation.

[0115] Furthermore, since the thread-like member 11 has a thread-like shape, it is possible to prevent breakage or the like even when stretched, and therefore the conductive thread-like wire 1 can maintain its mechanical strength.

[0116] Furthermore, the conductive thread-like wire 1 can be formed so that the thread-like member 11 and the adhesive coating layer 12 are all made of organic materials. Therefore, the conductive thread-like wire 1 has excellent reusability, such as the ability to reuse and recycle the components that make up the conductive thread-like wire 1, and it is easy to dispose of without the need for time-consuming sorting or other procedures, thereby offering the advantage of reducing the burden on the environment throughout the process from manufacture to disposal. Furthermore, even when the conductive thread-like wire 1 is attached to human skin, it can suppress the occurrence of metal allergies and reduce the burden on the user.

[0117] Furthermore, the conductive thread-like wiring 1 is composed of a thread-like member 11 and an adhesive coating layer 12, and is lightweight, so that when it is attached to the skin of a subject, it can be used while reducing the burden on the user, such as the feeling of wearing it.

[0118] The conductive thread-like wire 1 preferably contains at least one of a carbon-based material and a conductive polymer as the conductive material 121 constituting the adhesive coating layer 12. This allows the conductive thread-like wire 1 to be formed using an easily available organic or inorganic material as the conductive material 121.

[0119] The conductive thread-like wire 1 preferably includes at least one of natural fiber and chemical fiber as the thread-like member 11. This allows the conductive thread-like wire 1 to be formed using an easily available fiber material for the thread-like member 11.

[0120] The conductive thread-like wire 1 preferably contains a water-dispersible adhesive in the adhesive resin 122 that constitutes the adhesive coating layer 12. Because the conductive thread-like wire 1 uses a water-dispersible adhesive as the binder resin in the adhesive coating layer 12, it easily deforms in response to deformations in the surface of a living body, such as the skin. This allows the conductive thread-like wire 1 to adhere closely to the surface of a living body without any gaps, and to maintain its close adhesion even when deformations occur in the surface of the skin due to human movement.

[0121] In the conductive thread-like wire 1, the amount of adhesive coating layer 12 coated on the thread-like member 11 per unit length is preferably 100 mg / m or more. Generally, when a thread-like conductive material such as the thread-like member 11 is coated with an adhesive such as the adhesive coating layer 12, the amount of conductive material must be increased to reduce the resistance of the composite in which the conductive material is coated with the adhesive, but this makes the adhesive more likely to peel off and reduces flexibility. In the conductive thread-like wire 1, even when the thread-like member 11 is thickly coated with the adhesive coating layer 12, the adhesive coating layer 12 can be used to achieve low resistance while still providing the functionality of the adhesive coating layer 12, and the conductive wire 1 can reliably maintain conductivity and adhesiveness.

[0122] The conductive thread-like wire 1 preferably has a resistance value in the longitudinal direction of 100 Ω / cm to 2 kΩ / cm, so that the conductive thread-like wire 1 can have both conductivity and adhesiveness even when the thread-like member 11 is covered with the adhesive coating layer 12.

[0123] The adhesive resin 122 constituting the adhesive coating layer 12 of the conductive thread-like wire 1 preferably has a glass transition temperature Tg of -80°C to -20°C. This allows the adhesive coating layer 12 of the conductive thread-like wire 1 to have an appropriate softness, thereby preventing cracks from occurring on the surface of the adhesive coating layer 12 and preventing wear due to friction when the adhesive coating layer comes into contact with the surface of a living body. This improves the wear resistance of the conductive thread-like wire 1.

[0124] The conductive thread-like wire 1 is preferably used for attachment to the surface of a living body such as a human. Because the adhesive coating layer 12 has adhesiveness, it can maintain its adherence to the skin even when the surface of the skin is deformed due to, for example, the movement of the person. Therefore, the conductive thread-like wire 1 can be effectively used as a wire for transmitting detected electrical signals in a measuring device that detects electrical signals from a living body and measures biological information. Note that the conductive thread-like wire 1 is not limited to being attached to human skin, and can also be attached to places other than human skin or to the surface of living organisms other than humans.

[0125] As described above, the conductive thread-like wiring 1 has flexibility, conductivity, and abrasion resistance, and therefore can be suitably used as biological wiring for transmitting electrical signals from a living body relating to various biological information such as brain waves, retina, pulse waves, electrocardiograms, electromyograms, and body fat in the fields of sports and other exercise, and health care such as health and medicine.

[0126] <Biological information measuring device> A biological information measuring device to which the conductive thread wiring according to this embodiment is applied will be described.

[0127] Note that a living body refers to a human body (person) and animals such as cows, horses, pigs, chickens, dogs, and cats. The biological information measuring device can be suitably used for living bodies, particularly for human bodies. In this embodiment, as an example, a case where the living body is a human will be described. In this embodiment, a case where the biological information measuring device is attached to the skin of a person's hand and acquires electrical signals (biosignals) related to the person's biological information will be described. Note that the biosignals are electrical signals that represent, for example, an electrocardiogram waveform, brain waves, pulse rate, etc.

[0128] Fig. 4 is a diagram showing an example of the configuration of a biological information measuring device according to this embodiment. As shown in Fig. 4, the biological information measuring device 100 according to this embodiment includes an electrode 110, a thread-like wiring 120, a skin tape 130, a sensor fixing tape 140, a strain sensor 150, and a sensor unit 160. The electrode 110, the skin tape 130, the strain sensor 150, and the sensor fixing tape 140 are layered in this order from the hand side, which is the living body. The thread-like wiring 120 is connected to the electrode 110 and the sensor unit 160 so as to be provided on the surface side of the skin tape 130 and the sensor fixing tape 140. The sensor unit 160 is connected to the thread-like wiring 120 and the strain sensor 150, respectively, and is connected to the electrode 110 via the thread-like wiring 120.

[0129] The thread-like wiring 120 may be provided between the skin tape 130 and the sensor fixing tape 140, similar to the electrode 110. The strain sensor 150 may be provided on the surface of the sensor fixing tape 140 opposite to the skin tape 130 side. The strain sensor 150 may have one end connected to the thread-like wiring 120, and may be connected to the sensor unit 160 via the thread-like wiring 120, similar to the electrode 110.

[0130] In FIG. 4, electrode 110 and a portion of strain sensor 150 are attached to the hand so as to come into contact with two fingers, but they may also be attached to the hand so as to come into contact with three or more fingers.

[0131] (electrode) The electrode 110 is attached to the adhesive side of the skin tape 130, and is provided so as to be able to come into contact with the surface of the finger, which is a part of the living body, while being fixed to the finger by the skin tape 130. The electrode 110 has a thread-like wiring 120 connected to the surface opposite to the adhesive side.

[0132] The electrode 110 is used as a bioelectrode that detects an electrical signal (biological signal) related to bioinformation from the finger. The electrode 110 measures the potential difference (polarization voltage) between the finger and the electrode 110 to detect the biosignal.

[0133] The electrode 110 may have a sheet-like shape and may be formed into a substantially elliptical shape in a planar view. Note that the electrode 110 may have other shapes besides a sheet shape, such as a rod shape. Furthermore, the shape of the electrode 110 in a planar view is not limited to a substantially elliptical shape, and may be designed into any shape appropriate depending on the application location, use, etc., and may be formed into any shape such as a substantially circular, substantially rectangular, or substantially polygonal shape.

[0134] The thickness of the electrode 110 may be any appropriate thickness depending on its application, size, etc. The thickness of the electrode 110 refers to the length in the direction perpendicular to the surface of the electrode 110. The thickness of the electrode 110 is, for example, the thickness measured at an arbitrary location on the cross section of the electrode 110, and when measurements are taken at multiple locations at the arbitrary location, the thickness may be the average value of the thicknesses measured at these locations.

[0135] The electrode 110 can be formed using a conductive filler (conductive material). The type of conductive filler is not particularly limited as long as it is conductive. Examples of conductive fillers include, but are not limited to, carbon materials such as graphite, carbon black, carbon nanotubes, carbon nanohorns, and carbon fibers; metals such as aluminum, gold, silver, copper, iron, platinum, chromium, tin, indium, antimony, titanium, and nickel; conductive ceramics such as so-called ABO3-type perovskite complex oxides; and conductive polymers. These conductive fillers may be used alone or in combination of two or more. Among these, it is preferable to use conductive polymers or carbon materials from the viewpoints of safety to living bodies and conductivity.

[0136] When the conductive filler is a conductive polymer, the adhesive coating layer 12 of the conductive thread-like wiring 1 according to the present embodiment described above can be used. When the conductive filler is formed using the same material as the adhesive coating layer 12, the electrode 110 can have adhesiveness, and therefore the electrode 110 can be attached to a finger due to its self-adhesiveness.

[0137] (Thread-like wiring) The thread-like wiring 120 has one end connected to the electrode 110 and the other end connected to the sensor unit 160, connecting the electrode 110 and the sensor unit 160. As the thread-like wiring 120 uses the conductive thread-like wiring according to the present embodiment described above, details thereof will be omitted.

[0138] (skin tape) There are no particular limitations on the skin tape 130 as long as it is an adhesive tape that can be stuck to the hand. For example, an adhesive tape having adhesive layers on both sides of a base material can be used as the skin tape 130.

[0139] The substrate can be formed using, for example, a flexible resin having appropriate elasticity, flexibility, and toughness. Examples of materials that can be used to form the substrate include polyester-based resins such as polyethylene terephthalate (PET), polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, and polybutylene naphthalate; acrylic-based resins such as polyacrylic acid, polymethacrylic acid, polymethyl acrylate, polymethyl methacrylate (PMMA), polyethyl methacrylate, and polybutyl acrylate; polyolefin-based resins such as polyethylene and polypropylene; polystyrene-based resins such as polystyrene, imide-modified polystyrene, acrylonitrile-butadiene-styrene (ABS) resin, imide-modified ABS resin, styrene-acrylonitrile copolymer (SAN) resin, and acrylonitrile-ethylene-propylene-diene-styrene (AES) resin; polyimide-based resins; polyurethane-based resins; silicone-based resins; and thermoplastic resins such as polyvinyl chloride and vinyl chloride-vinyl acetate copolymer resin. Among these, polyolefin resins and PET are preferably used.

[0140] The substrate is preferably formed in a flat plate shape since the strain sensor 150 is placed on the upper surface side thereof.

[0141] The thickness of the substrate may be any appropriate thickness and is not particularly limited.

[0142] The adhesive layers provided on both sides of the substrate preferably have pressure-sensitive adhesive properties, which allow the adhesive layer to be easily attached by pressing it against a hand.

[0143] The material for the adhesive layer is not particularly limited as long as it is a material having pressure-sensitive adhesive properties, and examples thereof include biocompatible materials, etc. Examples of materials for forming the adhesive layer include acrylic pressure-sensitive adhesives and silicone pressure-sensitive adhesives.

[0144] Since the adhesive layer comes into direct contact with the skin of the hand, it is preferable that the adhesive layer has moisture permeability sufficient to allow water vapor and the like generated by the skin of the hand to escape to the outside. This, for example, can prevent sweat or water vapor from accumulating at the interface between the skin of the hand and the adhesive layer, thereby preventing moisture accumulated at the interface between the skin of the hand and the adhesive layer from weakening the adhesive strength of the adhesive layer and causing the skin tape 130 to peel off from the skin of the hand. The moisture permeability of the adhesive layer is not particularly limited as long as it can release water vapor generated by the skin of the hand to the outside. The adhesive layer may also be an adhesive tape formed from the above-mentioned materials.

[0145] The thickness of the adhesive layer can be selected arbitrarily and is not particularly limited.

[0146] (sensor fixing tape) There are no particular limitations on the sensor fixing tape 140 as long as it is an adhesive tape that can adhere to the skin tape 130 and can fix the strain sensor 150. For example, the sensor fixing tape 140 may be an adhesive tape having an adhesive layer on the side of the substrate where the strain sensor 150 is to be installed, or an adhesive tape having adhesive layers on both sides of the substrate.

[0147] The substrate constituting the sensor fixing tape 140 may be formed using a porous body having a porous structure and having flexibility, waterproofness, and moisture permeability, or may be formed using a substrate without a porous structure. Examples of materials that can be used to form the substrate constituting the sensor fixing tape 140 include thermoplastic resins such as polyurethane resins, polystyrene resins, polyolefin resins, silicone resins, acrylic resins, vinyl chloride resins, and polyester resins; silicone tape, etc.

[0148] The thickness of the substrate can be selected appropriately and is not particularly limited.

[0149] The material of the adhesive layer provided on at least the installation surface side of the substrate on which the strain sensor 150 is placed is not particularly limited, and may be the same material as the adhesive layer provided on the skin tape 130. The adhesive layer may also be an adhesive tape formed from the above-mentioned material.

[0150] (strain sensor) Strain sensor 150 is attached to a surface different from the side to which sensor fixing tape 140 is attached, and is provided so as to be able to come into contact with part of the finger and the surface of the back of the hand while being fixed to part of the finger and the back of the hand by sensor fixing tape 140. Strain sensor 150 is fixed to the finger so as to be provided at a position different from electrode 110 and not to overlap with electrode 110.

[0151] The strain sensor 150 has a substantially rectangular shape in a plan view. The strain sensor 150 electrically detects the expansion and contraction of the finger and hand by changing electrical characteristics such as resistance and capacitance due to expansion and contraction in the longitudinal direction.

[0152] The strain sensor 150 may be a commonly used strain sensor, such as a strain resistance element whose resistance value changes with expansion and contraction.

[0153] (sensor part) The sensor unit 160 is connected to the electrode 110 via the thread-like wiring 120 and also connected to the strain sensor 150, and acquires biosignals from the electrode 110 and electrically acquires electrical characteristics (e.g., resistance value, capacitance, etc.) that arise due to longitudinal expansion and contraction of the strain sensor 150. The sensor unit 160 may be attached to a fixing member 170 such as a band. By fixing the fixing member 170 to the user's wrist, the sensor unit 160 is fixed near the user's wrist.

[0154] The sensor unit 160 has a flexible substrate 161, a sensor main body 162, and a battery 163. The sensor unit 160 may have a connecting portion (for example, a thread-like wiring or the like) (not shown) that connects the flexible substrate 161 to the sensor main body 162.

[0155] The flexible substrate 161 is a resin substrate on which various components are mounted to acquire biosignals from the electrodes 110 and electrical characteristics generated by the strain sensor 150, and the flexible substrate 161 may also have a sensor body 162 and a battery 163 arranged thereon.

[0156] The sensor body 162 is placed on the flexible substrate 161, acquires the biosignal from the electrode 110 and the electrical characteristics generated by the strain sensor 150, and may have, for example, a component mounting portion that is a control portion.

[0157] The component mounting unit may include various components mounted on the flexible substrate 161, such as a CPU and integrated circuit that acquires bioinformation and processes, for example, the biosignal from the electrode 110 and the electrical characteristics generated by the strain sensor 150 to generate biosignal data, a switch that starts the bioinformation measuring device 100, a flash memory that stores the biosignal, and a light-emitting element. The component mounting unit may transmit the bioinformation via wired or wireless communication to an external device, such as an operation confirmation device that confirms initial operation, or a reading device that reads the bioinformation from the biosignal from the electrode 110 and the electrical characteristics generated by the strain sensor 150. The component mounting unit (not shown) may operate using power supplied from a battery 163.

[0158] The connection portion (not shown) may include, for example, a wiring (not shown) connected to the sensor main body 162, and a terminal (not shown) provided at one end of the wiring (not shown) and connected to the thread wiring 120 and the strain sensor 150.

[0159] As shown in FIG. 4 , the biological information measuring device 100 attaches the electrode 110 and the skin tape 130 to the user's hand, and fixes the fixing member 170, to which the sensor unit 160 is fixed, to the user's wrist. By attaching the electrode 110 to the skin of the user's hand, the biological information measuring device 100 acquires a biological signal from the user's hand via the electrode 110. The acquired biological signal is sent to the sensor unit 160 via the thread-like wiring 120. The biological information measuring device 100 also acquires electrical characteristics resulting from the expansion and contraction of the strain sensor 150 in accordance with the movement of the hand. The acquired electrical characteristics are sent to the sensor unit 160. The biological information measuring device 100 stores the acquired biological signal and electrical characteristics in a non-volatile memory, such as a flash memory, mounted on the component mounting portion of the sensor unit 160.

[0160] The battery 163 is placed on the flexible substrate 161 and supplies power to an integrated circuit or the like mounted on a component mounting portion (not shown) of the sensor main body 162. The battery 163 may be a general battery such as a coin battery.

[0161] There are no particular limitations on the manufacturing method of the biological information measuring device 100, and any appropriate method can be used for manufacturing the biological information measuring device 100. An example of the manufacturing method of the biological information measuring device 100 will be described.

[0162] 4, the electrode 110, thread-like wiring 120, skin tape 130, sensor fixing tape 140, strain sensor 150, and sensor unit 160 are prepared. Each of these components is not particularly limited as long as it can be manufactured by any method, and can be manufactured using any appropriate manufacturing method.

[0163] After preparing the components constituting the biological information measuring device 100 shown in Fig. 4, one end of the thread-like wiring 120 is connected to the electrode 110, and the electrode 110 is then attached to one side of the skin tape 130. A sensor fixing tape 140 is prepared with a strain sensor 150 attached to its attachment surface, and the sensor fixing tape 140 is attached to the other side of the skin tape 130 so that the strain sensor 150 is sandwiched between the skin tape 130 and the sensor fixing tape 140. The thread-like wiring 120 and the strain sensor 150 are then each connected to a sensor unit 160. This completes the biological information measuring device 100 shown in Fig. 4.

[0164] As described above, the biological information measuring device 100 includes the electrode 110, the thread-like wiring 120, the strain sensor 150, and the sensor unit 160, and the electrode 110 and the sensor unit 160 are connected via the thread-like wiring 120. As described above, the thread-like wiring 120 maintains flexibility while exhibiting excellent conductivity and wear resistance. Therefore, even if the surface of the skin is deformed due to body movement during use, the biological information measuring device 100 exhibits high flexibility, can acquire biological signals, and can suppress damage due to contact with other components. Therefore, the biological information measuring device 100 can maintain a state of adhesion to the skin, can stably measure biological information, and has high durability.

[0165] Furthermore, the biological information measuring device 100 preferably includes a strain sensor 150, and the strain sensor 150 is preferably connected to the sensor unit 160. This allows the biological information measuring device 100 to accurately grasp hand movements due to body movements during use.

[0166] As described above, the biological information measuring device 100 can measure biological information from the skin during use. Therefore, it can be effectively used as a biological information measuring device such as a wearable device fixed to human skin in the fields of healthcare and life sciences, such as health, medicine, and nursing care, and as an analysis device used to analyze human movements in fields such as games, sports, and music. For example, the biological information measuring device 100 can be suitably used to reflect the movements of a user's body, such as their hands, legs, or head, when using virtual reality in games, etc. Furthermore, the biological information measuring device 100 can be suitably used to confirm or analyze the movements of a user's body during sports movements, such as throwing a ball, running, and a golf swing, and during musical instrument playing.

[0167] Although the embodiments have been described above, they are presented as examples and the present invention is not limited to the above embodiments. The above embodiments can be implemented in various other forms, and various combinations, omissions, substitutions, modifications, etc. can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as set forth in the claims. [Example]

[0168] The present embodiment will be described in more detail below with reference to examples, but the present embodiment is not limited to these examples.

[0169] <Preparation of conductive compound liquid> [Preparation of conductive compound liquid A] 1.0 g of PEDOT / PSS pellets ("Orgacon DRY," manufactured by Agfa Materials Japan) as a conductive polymer and 23 g of water were added to a cup and stirred for 10 minutes at 2000 rpm using a stirring mixer (Thinky Corporation) at a rotation speed of 2000 rpm. Next, 12.0 g of an acrylic emulsion (2EHA / MMA / AA / =90 / 10 / 4, solids concentration: 52%, Tg: -28°C) as a binder resin and 2.0 g of glycerin were added using a stirring mixer at 2200 rpm for 10 minutes, and the mixture was stirred, mixed, and degassed to prepare conductive compound liquid A.

[0170] [Preparation of conductive compound liquid B] Conductive mixture solution B was prepared in the same manner as conductive mixture solution A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, 13 g of acrylic emulsion (2EHA / MA / MAA / AA / KBM503=85 / 13 / 0.75 / 1.25 / 0.02, solids concentration: 48%, Tg: -34°C) as the binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) as the carbon-based conductive material were added.

[0171] [Preparation of conductive compound liquid C] Conductive mixture liquid C was prepared in the same manner as conductive mixture liquid A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, 11 g of acrylic emulsion (2EHA / AA / MAA / NVP / KBM503=96 / 2 / 1 / 1 / 0.05, solids concentration: 54%, Tg: -40°C) as a binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) as a carbon-based conductive material were added.

[0172] [Preparation of conductive mixture D] Conductive mixture liquid D was prepared in the same manner as conductive mixture liquid A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, urethane latex (product name: Superflex E-2000, Tg: -38°C, Dai-ichi Kogyo Seiyaku Co., Ltd.) was added as a binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) was added as a carbon-based conductive material.

[0173] [Preparation of conductive compound liquid E] Conductive mixture solution E was prepared in the same manner as conductive mixture solution A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, urethane latex (product name: Superflex E-2000, Tg: -38°C, Dai-ichi Kogyo Seiyaku Co., Ltd.) was added as a binder resin, and 3.0 g of a multi-walled carbon nanotube aqueous dispersion (solids concentration: 6%, product name: KJ Carbon Nano Liquid F9106S, KJ Specialty Paper Co., Ltd.) was added as a carbon-based conductive material.

[0174] [Preparation of conductive compound liquid F] Conductive mixture solution F was prepared in the same manner as conductive mixture solution A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, acrylonitrile butadiene (NBR)-based latex (product name: LX513, Tg: -35°C, Zeon Corporation) was added as a binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) was added as a carbon-based conductive material.

[0175] [Preparation of conductive compound liquid G] Conductive mixture liquid G was prepared in the same manner as conductive mixture liquid A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, styrene butadiene (SBR) latex (product name: LX432M, Tg: -58°C, Zeon Corporation) as a binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) as a carbon-based conductive material were added.

[0176] [Preparation of conductive compound liquid H] Conductive mixture solution H was prepared in the same manner as conductive mixture solution A, except that 1.0 g of PEDOT / PSS pellets, 15 g of water, an acrylic emulsion (product name: LX851E, Tg: 5°C, Zeon Corporation) as a binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) as a carbon-based conductive material were added.

[0177] [Preparation of conductive compound liquid I] Conductive mixture I was prepared in the same manner as conductive mixture A, except that 1.0 g of PEDOT / PSS pellets, 10 g of water, an acrylic emulsion (product name: LX1571H, Tg: -17°C, Zeon Corporation) as a binder resin, and 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) as a carbon-based conductive material were added.

[0178] [Preparation of conductive compound liquid J] Conductive mixture liquid J was prepared in the same manner as conductive mixture liquid A, except that 8 g of a Ketjenblack aqueous dispersion (solid content concentration: 13%, product name: 9535Black, manufactured by Tokushiki Corporation) was added as the carbon-based conductive material, and urethane latex (product name: Superflex E-2000, Tg: -38°C, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) was added as the binder resin.

[0179] [Preparation of conductive compound liquid K] 1.0 g of PEDOT / PSS pellets were added to a cup with 42 g of commercially available laundry starch (aqueous polyvinyl alcohol (PVA) solution, solids concentration: 15%, Tg: 51°C) as a binder resin and 2 g of glycerin, and the mixture was stirred at 2000 rpm for 10 minutes using a stirring mixer. Next, conductive mixture K was prepared in the same manner as conductive mixture A, except that 3.0 g of conductive carbon black aqueous dispersion (solids concentration: 6%, product name: CCT-061, Taisei Kako Co., Ltd.) was added as a carbon-based conductive material.

[0180] <Examples 1 to 8 and Comparative Examples 1 to 5> [Fabrication of conductive filamentous wiring] Each of the prepared conductive compound solutions A to K was applied to a polyester thread (filament, 280 dteX, Teijin Limited) as a thread-like member so as to obtain the coating amount shown in Table 1, and then dried at 130°C for 2 minutes to produce a conductive thread-like wiring in which the polyester thread was coated with an adhesive coating layer.

[0181] [Characteristics of conductive filament wiring] The surface resistivity, resistance, durability, and abrasion resistance of the conductive filamentous wiring were measured and evaluated as the properties of the conductive filamentous wiring. The surface resistivity, resistance, and durability were used as indicators of the conductivity of the conductive filamentous wiring.

[0182] (Measurement of surface resistance) The conductive filamentous wiring was formed into a sheet to produce a filamentous wiring for substitution evaluation. The prepared conductive liquid mixture was applied using an applicator to a polyethylene terephthalate (PET) film (MRF38, manufactured by Mitsubishi Plastics, Inc., thickness 38 μm) that had been surface-treated with a silicone-based release agent, and then heated and dried in a dryer at 130°C for 3 minutes to produce a 30 μm-thick conductive sheet. Next, the sheet resistance was measured as the surface resistance of the sheet using an eddy current measurement method using a non-contact resistance meter (NC-80NC, manufactured by Napson Co., Ltd.) in accordance with JIS Z 2316-1:2014. The measurement range was 0.5 mm to 150 mm from the main surface of the electrode sheet. The measurement results for the surface resistance of the conductive filamentous wiring are shown in Table 1.

[0183] (Measurement of resistance value) The conductive thread-like wire was clamped at both ends with alligator clips so that the length was 4 cm, and the resistance of the conductive thread-like wire was measured by applying a voltage of 1 V using an impedance analyzer (product name: IM3570, manufactured by Hioki E.E. Corporation). The measurement results of the resistance of the conductive thread-like wire are shown in Table 1.

[0184] (durability) A cycle test was performed 100 times, with one cycle consisting of applying a voltage of 1 V to the conductive filamentous wiring for 10 seconds and then removing the voltage for 10 seconds. The resistance value was measured after the cycle test was repeated 100 times. The resistance value before the cycle test was the same as that used in the "(Resistance Value Measurement)" section above, and the change in resistance before and after the cycle test was measured. The change in resistance before and after the cycle test was used as an indicator of durability, and the durability of the conductive filamentous wiring was evaluated based on the following evaluation criteria. The evaluation results for the durability of the conductive filamentous wiring are shown in Table 1. *Evaluation criteria A: The change in resistance before and after the cycle test is less than 10%. B: The change in resistance before and after the cycle test is 10% or more and less than 20%. C: The change in resistance before and after the cycle test is 20% or more.

[0185] (wear resistance) The conductive filamentous wiring was rubbed with a paper cloth, and the appearance was observed, and the abrasion resistance of the conductive filamentous wiring was evaluated based on the following evaluation criteria. The evaluation results of the abrasion resistance of the conductive filamentous wiring are shown in Table 1. *Evaluation criteria A: The appearance of the conductive thread-like wiring remains unchanged even after rubbing it with a paper cloth. B: After rubbing the conductive thread-like wiring with a paper cloth, the adhesive coating layer did not peel off, but the surface of the conductive thread-like wiring was damaged. C: After rubbing the conductive thread-like wiring with a paper cloth, peeling of the adhesive coating layer was observed.

[0186] [Table 1]

[0187] As can be seen from Table 1, in each example, the surface resistance and resistance of the conductive filamentous wiring were low, the change in resistance before and after the cycle test was less than 20%, and no peeling of the adhesive coating layer was observed. On the other hand, in each comparative example, the surface resistance or resistance of the conductive filamentous wiring was high, the change in resistance before and after the cycle test was 20% or more, or peeling of the adhesive coating layer was observed.

[0188] Therefore, it was confirmed that the conductive thread-like wires of the above examples exhibit excellent conductivity and abrasion resistance while maintaining flexibility when an adhesive coating layer containing a conductive material and an adhesive resin is used. Therefore, it can be said that the conductive thread-like wires of the present embodiment can be effectively used to measure biological information by attaching them to the skin of a subject without being affected by the movement of the subject, etc.

[0189] The embodiments of the present invention are as follows, for example. <1> a conductive filament-like member; an adhesive coating layer that coats the thread-like member; Equipped with The adhesive coating layer is a conductive thread wiring having a conductive material and an adhesive resin containing the conductive material. <2> the conductive material includes at least one of a carbon-based material and a conductive polymer; <1> The conductive thread-like wiring according to claim 1. <3> The thread-like member includes at least one of a natural fiber and a chemical fiber. <1> or <2> The conductive thread-like wiring according to claim 1. <4> The adhesive resin includes a water-dispersible adhesive. <1> ~ <3> The conductive thread wiring according to any one of the above. <5> The amount of the adhesive coating layer applied to the filamentous member per unit length is 100 mg / m or more. <1> ~ <4> The conductive thread wiring according to any one of the above. <6> The resistance value in the length direction of the conductive thread-like wiring is 100 Ω / cm to 2 kΩ / cm. <1> ~ <5> The conductive thread wiring according to any one of the above. <7> The adhesive resin has a glass transition temperature of -80°C to -20°C. <1> ~ <6> The conductive thread wiring according to any one of the above. <8> For application to the surface of living organisms <1> ~ <7> The conductive thread wiring according to any one of the above. <9> one or more thread-like wirings; an electrode provided so as to be in contact with the surface of the living body and connected to one end of the wiring; a sensor unit connected to the other end of the wiring; Equipped with The thread-like wiring is <1> ~ <8> A biological information measuring device comprising the conductive thread wiring according to any one of the above. <10> a strain sensor provided in contact with the surface of the living body and connected to the sensor unit; <9> The biological information measuring device described in <11> A step of preparing a conductive mixture liquid containing a conductive material and an adhesive resin; a step of applying the conductive mixture liquid to the surface of a conductive filamentous member and drying the same to coat the filamentous member with an adhesive coating layer containing the conductive material and the adhesive resin; A method for manufacturing a conductive thread-like wiring comprising: [Explanation of symbols]

[0190] 1 Conductive filament wiring 11 Thread-like member 12 Adhesive coating layer 100 Biological information measuring device 110 electrodes 120 Thread-like wiring 130 Skin Tape 140 Sensor fixing tape 150 Strain Sensor 160 Sensor unit

Claims

1. a conductive filament-like member; an adhesive coating layer that coats the thread-like member; Equipped with The adhesive coating layer has a conductive material and an adhesive resin containing the conductive material.

2. The conductive thread trace according to claim 1 , wherein the conductive material includes at least one of a carbon-based material and a conductive polymer.

3. The conductive thread trace according to claim 1 , wherein the thread-like member includes at least one of a natural fiber and a chemical fiber.

4. The conductive thread trace according to claim 1 , wherein the adhesive resin comprises a water-dispersible adhesive.

5. 2. The conductive thread-like wiring according to claim 1, wherein the amount of the adhesive coating layer applied to the thread-like member per unit length is 100 mg / m or more.

6. 2. The conductive thread-like wire according to claim 1, wherein the resistance value in the length direction of the conductive thread-like wire is 100 Ω / cm to 2 kΩ / cm.

7. The conductive thread trace according to claim 1, wherein the adhesive resin has a glass transition temperature of -80°C to -20°C.

8. The conductive thread wiring according to claim 1, which is to be attached to the surface of a living body.

9. one or more wires; an electrode provided so as to be in contact with the surface of the living body and connected to one end of the wiring; a sensor unit connected to the other end of the wiring; Equipped with A biological information measuring device, wherein the wiring is the conductive thread wiring according to claim 1.

10. The biological information measuring device according to claim 9 , further comprising a strain sensor provided so as to be able to come into contact with the surface of the living body and connected to the sensor unit.

11. A step of preparing a conductive mixture liquid containing a conductive material and an adhesive resin; a step of applying the conductive mixture liquid to the surface of a conductive filamentous member and drying the same to coat the filamentous member with an adhesive coating layer containing the conductive material and the adhesive resin; A method for producing a conductive thread-like wiring, comprising:

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