JP2011153214A - Conductive resin composition and conductive sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive resin composition of high conductivity and heat resistance, and improved in flexibility of a conventional conductive resin, to substitute a conventional metal electrode, wiring and soldering connection, and a conductive sheet comprising the composition. <P>SOLUTION: This conductive resin composition contains a hydrocarbon elastomer resin having specified dynamic physical properties and a fixed level or less of crystallinitiy, and a conductive carbon filler such as carbon black, at a fixed ratio thereof, can keep flexibility even when filling the conductive carbon filler at high density to impart conductivity, and is suitable for substituting the metal electrodes of various batteries made conventionally of metal, having a problem of corrosion or the like, and required to be light-weighted, the wiring and the soldering connection, since an obtained film is flexible and is highly heat-resistant and/or solvent-proof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a resin composition and a sheet having high conductivity, heat resistance, stability, and flexibility.

As a method for producing a conductive thermoplastic resin, a method of filling a resin with carbon black is known (Patent Document 1). The disclosed composition has a relatively low carbon black content and a relatively high volume resistance.
On the other hand, as a separator for a fuel cell, a resin composition filled with a higher conductive carbon filler is disclosed (Patent Document 2). The resulting highly filled resin composition exhibits a low volume resistivity but is rigid and poor in flexibility.

JP 60-65064 A JP 2004-131551 A

An object of the present invention is to provide a conductive resin composition having high conductivity and heat resistance and improved flexibility of a conventional conductive resin, and a conductive sheet comprising the same. This conductive sheet has the potential to replace conventional metal electrodes, wiring and solder connections. For example, it has a possibility as a substitute for a metal electrode of a solar battery, various batteries, or a secondary battery, or as a sealing material such as an organic PTC material or packing. For example, when used as a wiring material for a solar cell or an electrode of a battery, it is necessary to withstand bending and deformation during the manufacturing process and vibration during use, and flexibility is important. Moreover, it is thought that the wiring which consists of a conductive resin composition which does not corrode essentially is very important for these uses.

It is a resin composition comprising a specific hydrocarbon elastomer resin and a conductive carbon filler. Even if the conductive carbon filler is high-filled to give conductivity, surprisingly softness is maintained, The obtained film is flexible and has high heat resistance.

Provided are a conductive resin composition and a sheet having high electrical conductivity, flexibility, mechanical strength, and heat resistance, which are useful as wiring materials for electric devices, electronic devices, solar cells, and electrode materials for lithium ion batteries.

Initial tensile modulus of elasticity of 100 MPa or less, tensile elongation at break of 300% or more, tensile break strength of 10 MPa or more, total crystal fusion heat of 80 J / g or less of hydrocarbon elastomer resin, conductive carbon filler 50 to 200 It is a resin composition consisting of 80 parts by mass, preferably 80 to 200 parts by mass of conductive carbon filler.
Here, the total heat of crystal melting is the sum of the heat of crystal melting of the crystal melting peak observed in the range of 50 ° C. to 300 ° C. determined by DSC measurement. The hydrocarbon elastomer resin used in the present invention is, for example, an olefin copolymer such as ethylene-α olefin copolymer, propylene-α olefin copolymer, ethylene-cyclic olefin copolymer, or ethylene-styrene. Olefin-aromatic vinyl compound copolymer such as copolymer, ethylene-vinyl acetate copolymer, ethylene-polar monomer copolymer such as ethylene-acrylic acid ester copolymer, random styrene-diene copolymer, For example, SBR and the like, or block styrene-diene copolymers such as SBS and SIS, and hydrogenated products thereof such as hydrogenated SBR, SEBS, and SEPS can be exemplified. In addition, graft copolymers and cross copolymers of these copolymers can also be used. Here, the α-olefin of the ethylene-α-olefin copolymer is an α-olefin having 3 to 20 carbon atoms not containing ethylene, and the α-olefin of the propylene-α-olefin copolymer does not contain propylene, Ethylene or an α-olefin having 4 to 20 carbon atoms is shown.
The cyclic olefin is a cyclic olefin having 5 to 20 carbon atoms such as norbornene, ethylidene norbornene, and dicyclopentadiene. The aromatic vinyl compound is an aromatic vinyl compound having a carbon number of 8 to 20, such as styrene, paramethylstyrene, divinylbenzene and the like. Moreover, polar monomers are acrylic acid esters such as methyl acrylate, methacrylic acid esters such as methyl methacrylate, vinyl acetate, acrylonitrile and the like having 3 to 20 carbon atoms, in addition to oxygen atoms or nitrogen atoms in the molecule. 1 to 3 polar monomers.

Other resins that may be included in the resin composition are not particularly limited. For example, fluororesin, polyether ether ketone resin, polyetherimide resin, polyamidoside resin, polyphenylene sulfide resin, polyethersulfone resin, Ether ketone resin, polyoxybenzoyl ester resin, polyester, polyacetal, polyamide, polyarylate, polyallyl sulfone, polybenzimidazole, polyether nitrile, polythioether sulfone, polyimide, polyamino bismaleimide, polyketone, polyphenylene ether, polysulfone, liquid crystal polyester Examples thereof include liquid crystal polymers represented by resins. These additions may reduce the affinity with the conductive carbon filler, resulting in the deterioration of mechanical properties, the occurrence of brittleness, and the decrease in conductivity. Other than the total mass of the hydrocarbon elastomer resin, The total mass of the resin needs to be 30% by mass or less, preferably 10% by mass or less.
When the total heat of crystal fusion of the hydrocarbon elastomer resin used is higher than the above range, the flexibility of the conductive resin composition finally obtained is lowered and becomes rigid, and the conductive carbon filler and It is not preferable because the affinity may be lowered, resulting in a decrease in molding processability and mechanical properties, the occurrence of brittleness, and a decrease in conductivity.
Further, if the elongation at break and the tensile strength at break of the hydrocarbon elastomer resin used are out of the above ranges, the mechanical properties of the finally obtained resin composition will be unfavorable.
The fluidity of the present hydrocarbon-based elastomer resin is preferably higher after satisfying the above conditions in consideration of kneading with a conductive carbon filler. For example, the MFR value measured at 190 ° C. and a load of 2.16 N 1 g / 10 min or more is preferable.

For example, when a flexible conductive film made of a conductive resin composition is used as an alternative to a metal electrode (collector electrode) of a lithium ion battery, resistance to a carbonate ester solvent is required. Specifically, when a sheet having a thickness of 300 microns is immersed in a mixed solvent having a mass ratio of 1: 1: 1 of ethylene carbonate, diethyl carbonate, and dimethyl carbonate at 60 ° C. for 1 week, the weight increase rate (swelling) Degree) needs to be 20% or less.
Further, when used in the same application, N-methylpyrrolidone is used as a solvent when coating a carbon material, an active material, or a binder for electrodes, but resistance to heat treatment during the coating process is required. Specifically, a sheet having a thickness of 300 microns is placed on a metal plate at 100 ° C., and one drop of N methylpyrrolidone is dropped. After 1 minute, the surface was wiped off with a gauze and judged from the sheet surface condition and the carbonaceous adhesion to the gauze (blackness). It is necessary that the carbonaceous material does not adhere to the gauze visually.

In order to satisfy the resistance to these solvents, in the case of an olefin-aromatic vinyl compound copolymer having an aromatic vinyl compound component such as styrene, the content of the aromatic vinyl compound needs to be 50% by mass or less. In the case of an olefin copolymer such as an ethylene-α olefin copolymer, a propylene-α olefin copolymer, and an ethylene-cyclic olefin copolymer, the resistance to the present solvent is high regardless of the composition thereof. Resin compositions comprising 100 parts by mass of these hydrocarbon elastomer resins and 80 parts by mass or more and 200 parts by mass or less of conductive carbon filler can exhibit resistance to the solvent. In the case of the ethylene-polar monomer copolymer, when the polar monomer content is higher than 10% by mass, it is difficult to satisfy the resistance to the solvent, which is not preferable.
In the case of a random styrene-diene copolymer, a block styrene-diene copolymer, or a hydrogenated product thereof, this resistance is not sufficient and is not preferable.

As the heat resistance of the resin composition, the temperature at which the storage elastic modulus obtained by measuring the viscoelastic spectrum is reduced to 10 ⁷ Pa is 150 ° C. or higher, preferably 200 ° C. or higher. When used as a material or wiring material, it is most preferably 250 ° C. or higher in consideration of solder resistance at a contact point with a metal material and heat resistance in other processes. When the most preferable heat resistance of 250 ° C. or higher is expressed, an olefin-aromatic vinyl compound copolymer is used as the hydrocarbon elastomer resin, and 100 parts by mass of the hydrocarbon elastomer resin and the conductive carbon filler are used. A resin composition comprising -80 parts by mass or more and 200 parts by mass or less is preferred. Further, the olefin-aromatic vinyl compound copolymer used preferably has an aromatic vinyl compound content of 10% by mass to 80% by mass, and from the viewpoint of the solvent resistance, the aromatic vinyl compound content of 10% by mass to 50% by mass. The following is preferable.

Examples of the olefin-aromatic vinyl compound copolymer used in the present invention include copolymers described in EP0416815A2, JP3659760, EP872492B1.
Of the cross copolymers described in WO2000 / 37517, USP6559234, or WO2007139116, the main chain is an olefin-aromatic vinyl compound-aromatic polyene (diene) copolymer, and an aromatic vinyl compound chain ( Those containing less than 50% by mass of polystyrene chains are included in the concept of olefin-aromatic vinyl compound copolymer.
The hydrocarbon-based elastomer resin used in the present invention does not necessarily need to be a single material, and may be a resin composition composed of a plurality of hydrocarbon-based elastomer resins. Each of the above conditions is the same as that of the hydrocarbon-based elastomer resin. It is defined as a condition for the entire composition.

Examples of the conductive carbon filler used in the present invention include carbon black, graphite or a mixture thereof. Examples of the graphite used include expanded graphite and granular graphite. The average particle diameter of graphite is preferably 5 to 100 μm from the viewpoint of dispersibility.
Moreover, as carbon black to be used, oil furnace black, acetylene black, furnace black, and thermal black are mentioned, for example. These average particle diameters are preferably 30 to 50 nm from the viewpoint of dispersibility and the like. These carbon blacks may contain up to 5% by weight of boron to improve conductivity.

The conductive sheet made of the conductive resin composition of the present invention is characterized by high conductivity (low volume resistivity), flexibility and heat resistance.
Specifically, it has a conductivity of 0.5 S / cm or more, preferably 0.8 S / cm or more and 300 S / cm or less.
Further, as the flexibility, specifically, the initial tensile modulus of elasticity is 2000 MPa or less, preferably 1000 MPa or less, and the tensile breaking point elongation is 5% or more, preferably 10% or more, the tensile breaking strength is 5 MPa or more,
Preferably it is 10 MPa or more.

The conductive resin composition of the present invention can be mixed using a kneader such as a heating roll, an extruder, or a Banbury mixer. Further, the composition of the present invention includes known hindered phenol-based, sulfur-based, phosphorus-based antioxidants, hindered amine-based, triazole-based, benzophenone-based, benzoate-based, nickel-based, salicyl-based and the like as additives. Light stabilizers, antistatic agents, lubricants, molecular modifiers such as peroxides, metal deactivators, organic and inorganic nucleating agents, neutralizing agents, antacids, antibacterial agents, fluorescent whitening agents, One or more fillers, flame retardants, flame retardant aids and the like can be added.
The conductive sheet of the present invention can be produced by a known molding method, that is, a molding method such as T-die molding, calendar molding, roll molding, or cast molding. The film of the present invention may be another suitable film depending on the application, such as a fluororesin, a polyetheretherketone resin, a polyetherimide resin, a polyamidoside resin, a polyphenylene sulfide resin, a polyethersulfone resin, a polyetherketone resin. Polyoxybenzoyl ester resin, polyester, polyacetal, polyamide, polyimide, polyarylate, polyallylsulfone, polybenzimidazole, polyethernitrile, polythioethersulfone, polyimide, polyaminobismaleimide, polyketone, polyphenylene ether, polysulfone, liquid crystal polyester resin Multi-layered with various films such as liquid crystal polymer, polypropylene, polyethylene, polystyrene and syndiotactic polystyrene. Can.

The conductive resin composition and conductive sheet of the present invention can be subjected to electron beam crosslinking or crosslinking treatment with a crosslinking agent in order to further improve heat resistance and solvent resistance. In the case of electron beam crosslinking, a known electron beam crosslinking apparatus and irradiation conditions can be used. Moreover, you may add crosslinking accelerators, such as an isocyanuric acid compound. Also in the case of crosslinking treatment with a crosslinking agent, known crosslinking materials, crosslinking assistants, and crosslinking methods can be used.

The conductive resin composition and the conductive sheet of the present invention have a possibility of replacing metal electrodes, wiring, and solder connection of electric devices and electronic devices. In particular, as a solar cell material, it is considered useful as a wiring or electrode material replacing a conventional metal wiring. For example, solar cells are required to have high durability and reliability of 20 to 30 years. Compared to conventional metal wiring and solder connection, which has problems in terms of corrosion, deterioration due to corrosion, connection strength, and complexity in the manufacturing process, the use of flexible conductive resin improves durability and connection stability, and the manufacturing process. The possibility of simplification is expected. Further, by using a back electrode made of a conductive sheet, wiring on the cell surface can be eliminated, and power generation efficiency can be improved. It is also possible to provide a solar cell hot spot prevention function and an abnormal cell automatic shut-off function by utilizing the so-called PTC characteristic, which is a characteristic of a compound type conductive resin that increases the resistance value due to temperature rise. is there.

Lithium ion batteries are required to have higher performance and lighter weight as the EV and HEV automobile markets grow. If the metal electrode (collector electrode) of the lithium ion battery can be replaced with a conductive resin composition and a conductive sheet, it can greatly contribute to weight reduction, which is advantageous. Conventionally, an electrode is formed by coating an active material containing a carbon material on the surface of aluminum or copper metal. However, there is a problem in adhesion at the interface with the metal electrode, and an active material containing a carbon material is more difficult. It is considered that this problem can be improved by adopting the conductive resin composition and the conductive sheet having higher affinity with the substance.
In addition, solar cells, particularly so-called back electrode types that do not have electrodes on the light receiving surface, or high-efficiency solar cells of the type called back contacts, have the potential to be used for connection between cells (for example, Sharp Technical Report). 93, December 2005). In this case, reliability of the connection and long-term durability against corrosion are advantageous.
Furthermore, in various flexible electronic devices that are expected to grow in the future, flexible and highly reliable wiring materials that are compatible with the assumed roll-roll process are expected. Furthermore, it can be used as a conductive material that is well dispersed in a solvent and can be wired by various printing methods.

  EXAMPLES Hereinafter, although an Example demonstrates this invention, these Examples do not limit this invention.

A conductive resin composition was obtained as follows.
<Raw resin>
The raw material resins used in Examples and Comparative Examples are as follows.
Ethylene-styrene copolymer 1
Styrene content 41% by mass (16 mol%), Mw = 92000, Mw / Mn = 2.2
The ethylene-styrene copolymer was produced by the production method described in JP3659760.
The following cross-copolymer was produced by the production method described in WO2000 / 37517 or WO2007139116, and the following composition was similarly determined by the method described in these publications. These cross copolymers are obtained by conducting anionic polymerization in the presence of an ethylene-styrene-divinylbenzene copolymer obtained by coordination polymerization and a styrene monomer, and an ethylene-styrene-divinylbenzene copolymer chain and polystyrene. A copolymer having a chain. Hereinafter, in order to define a cross copolymer, the styrene content, divinylbenzene content, weight average molecular weight (Mw), molecular weight distribution (Mw / Mn) of the ethylene-styrene-divinylbenzene copolymer used, the cross copolymer The polystyrene chain content, the molecular weight (Mw) of the polystyrene chain, and the molecular weight distribution (Mw / Mn) are shown. The total styrene content is a total content of the styrene contents contained in the ethylene-styrene-divinylbenzene copolymer chain and the polystyrene chain contained in the cross copolymer.

Cross copolymer 1
Ethylene-styrene-divinylbenzene copolymer styrene content 10 mol%, divinylbenzene content 0.045 mol%, Mw = 98000, Mw / Mn = 2.3
Polystyrene chain content 15% by mass, Mw = 22000, Mw / Mn = 1.3
Total styrene content 41% by mass

Cross copolymer 2
Ethylene-styrene-divinylbenzene copolymer styrene content 6 mol%, divinylbenzene content 0.030 mol%, Mw = 80000, Mw / Mn = 2.4
Polystyrene chain content 35% by mass, Mw = 19000, Mw / Mn = 1.2
Total styrene content 47% by mass

Cross copolymer 3
Ethylene-styrene-divinylbenzene copolymer styrene content 8 mol%, divinylbenzene content 0.035 mol%, Mw = 110000, Mw / Mn = 2.3
Polystyrene chain content 11% by mass, Mw = 24000, Mw / Mn = 1.2
Total styrene content 32% by mass,

Cross copolymer 4
Ethylene-styrene-divinylbenzene copolymer styrene content 16 mol%, divinylbenzene content 0.083 mol%, Mw = 100000, Mw / Mn = 2.2
Polystyrene chain content 17% by mass, Mw = 28000, Mw / Mn = 1.2
Total styrene content 52 mass%,

Cross copolymer 5
Ethylene-styrene-divinylbenzene copolymer styrene content 25 mol%, divinylbenzene content 0.070 mol%, Mw = 15000, Mw / Mn = 2.2
Polystyrene chain content 17% by mass, Mw = 18000, Mw / Mn = 1.2
Total styrene content 63% by mass

Cross copolymer 6
Ethylene-styrene-divinylbenzene copolymer having a styrene content of 30 mol%, a divinylbenzene content of 0.090 mol%, Mw = 135,000, Mw / Mn = 2.3
Polystyrene chain content 21% by mass, Mw = 29000, Mw / Mn = 1.2
Total styrene content 69% by mass

Ethylene-octene copolymer: Dow Chemical Company Engage 8100
Hydrogenated styrene-butadiene block copolymer: H1053 manufactured by Asahi Kasei Corporation
Ethylene-propylene copolymer / polypropylene compound: Mitsui Chemicals, Inc. NOTIO PN2070
Ethylene-vinyl acetate copolymer: EV-260 manufactured by Mitsui-Deupon
High-density polyethylene: Prime Polymer Hi-Zex 7800M
Linear low density polyethylene: Dow Chemical affinity FM1570
Table 1 shows the MFR value, mechanical properties, and total crystal melting heat of the above resins.

<Conductive carbon filler>
Denka Black Granular product: Denka Black manufactured by Denki Kagaku Kogyo Co., Ltd. Boron-containing product, boron content 1% by mass: manufactured by Denki Kagaku Kogyo Co., Ltd. <Kneading method>
The resin described in Table 1 and Denka Black granular product or Denka Black boron-containing product were kneaded as follows to obtain a compound.
Using a Brabender plasticizer (PL2000 model manufactured by Brabender Co.), a total of about 45 g of resin and conductive carbon filler was kneaded at 250 ° C., 30 rpm for 30 minutes to prepare a resin composition. As an antioxidant, 0.1 part by mass of Ciba Japan Irganox 1076 was used.
As a film for evaluating physical properties, a film having a thickness of about 300 microns formed by a hot press method (temperature: 270 ° C., time: 10 minutes, pressure: 100 kg / cm 2) was used.

<Cast method>
The resin and Denka black granular material shown in Table 1 were dissolved / dispersed in a heated toluene solvent, cast on a glass plate using a blade, and air-dried at room temperature overnight to prepare a cast film.

<Tensile test>
In accordance with JIS K-6251, the obtained film was cut into No. 2 1/2 type test piece shape, and the initial tensile elastic modulus was used at a tensile speed of 500 mm / min using a Shimadzu AGS-100D type tensile tester. The elongation at break and the strength at break were measured.

<Conductivity measurement>
The conductivity was measured using a low resistivity meter Lorester GP manufactured by Mitsubishi Analitech. The four-end needle probe used was either ASP or ESP depending on the thickness of the sample film.

<Viscoelastic spectrum>
A sample for measurement (3 mm × 40 mm) was cut out from a film having a thickness of about 0.5 mm obtained by the above-mentioned hot press method, and a dynamic viscoelasticity measuring apparatus (Rheometrics RSA-III) was used. It measured in the range of 50 degreeC-+250 degreeC.
Other measurement parameters are as follows: Measurement frequency 1Hz
Temperature rising speed 4 ° C / min Sample chuck length (measurement length) 10mm
Initial Static Force 5.0g
Auto Tension Sensitivity 1.0g
Max Auto Tension Rate 0.033mm / s
Max Applied Strain 1.5%
Min Allowed Force 1.0g

In the present specification, the heat resistance index is a temperature at which the storage elastic modulus (E ′) obtained by measuring the viscoelastic spectrum under these conditions is reduced to 10 ⁷ Pa, and is 150 ° C. or higher, preferably 200 ° C. or higher, Most preferably, it is 250 degreeC or more. More preferably, it is a temperature at which the length change (δL) in the tensile direction of the sample during measurement is maintained at 10% or less under the present measurement conditions, and is 150 ° C. or higher, preferably 200 ° C. or higher, and most preferably 250 ° C. or higher.

<Electrolytic solution resistance test>
A sheet having a thickness of 300 microns was immersed in a mixed solvent having a mass ratio of 1: 1: 1 of ethylene carbonate, diethyl carbonate, and dimethyl carbonate at 60 ° C. for 1 week, and the sheet state, weight increase rate (swelling Degree). The degree of swelling needs to be 20% or less.

<N-methylpyrrolidone (NMP) resistance test>
A 300 micron thick sheet is placed on a 100 ° C. metal plate and a drop of N-methylpyrrolidone is added dropwise. After 1 minute, the surface is wiped with a gauze and judged from the surface condition of the sheet and the degree of carbonaceous adhesion to the gauze (blackness).
It is necessary that the surface state of the sheet is not dissolved or swelled, and that the carbonaceous matter does not adhere to the gauze visually.
○: There is no dissolution or deformation on the sheet surface. No carbonaceous deposits are observed on the gauze.
Δ: There is no dissolution on the sheet surface, but deformation is observed. Slight carbonaceous deposits are observed on the gauze.
X: Dissolution or deformation is observed on the sheet surface. Carbonaceous deposits are observed on the gauze.
○ is accepted.

The formulations and measurement results of the examples are shown in Tables 2 and 3, and the formulations and measurement results of the comparative examples are shown in Table 4.

The resin compositions of the examples all show conductivity, flexibility, mechanical properties, and heat resistance. On the other hand, when the ratio of the conductive carbon filler is below a certain level, not only the conductivity but also the heat resistance and solvent resistance are lowered. In the case of a hydrocarbon-based elastomer resin that does not satisfy the conditions of the present invention, the resulting resin composition is hard and brittle, and molding is extremely difficult. Furthermore, using an olefin-aromatic vinyl compound copolymer, a resin composition consisting of 80 parts by mass or more and 200 parts by mass or less of conductive carbon filler with respect to 100 parts by mass of the resin can exhibit heat resistance of 250 ° C. or more. Therefore, it is particularly preferable for an electrical connection circuit that requires soldering heat resistance.
Considering the result of the solvent resistance test assuming the replacement of the metal electrode (collector electrode) of the lithium ion battery, the content of the ethylene-α olefin copolymer, the propylene-α olefin copolymer, and the aromatic vinyl compound is 50. A resin composition consisting of 80 parts by mass or more and 200 parts by mass or less of conductive carbon filler with respect to 100 parts by mass of these resins is satisfied using an olefin-aromatic vinyl compound copolymer of mass% or less.

Claims (9)

Initial tensile elastic modulus of 100 MPa or less, tensile elongation at break of 300% or more, tensile fracture strength of 10 MPa or more, total mass melting heat of 80 J / g or less of hydrocarbon elastomer resin, conductive carbon filler 50 to 200 A conductive resin composition comprising parts by mass. Hydrocarbon elastomer resin is olefin copolymer, ethylene-polar monomer copolymer, olefin-aromatic vinyl compound copolymer, random styrene-diene copolymer or block styrene-diene copolymer The conductive resin composition according to claim 1, wherein the conductive resin composition is a hydrogenated product. The hydrocarbon-based elastomer resin is an olefin-aromatic vinyl compound copolymer, the conductive carbon filler is 80 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass of the resin, and is obtained by viscoelastic spectrum measurement. The conductive resin composition according to claim 2, wherein the temperature at which the elastic modulus decreases to 10 ⁷ Pa is 250 ° C or higher. The electrical conductivity of 0.5 S / cm or more and 300 S / cm or less, the tensile initial elastic modulus 2000 MPa or less, the tensile breaking point elongation 5% or more, and the tensile breaking strength 5 MPa or more. A conductive sheet comprising the resin composition according to one item. The electrical wiring material which consists of a conductive resin composition as described in any one of Claims 1-3. A solar cell comprising the electrical wiring material according to claim 5. The hydrocarbon elastomer resin is selected from an ethylene-α olefin copolymer, a propylene-α olefin copolymer, and an olefin-aromatic vinyl compound copolymer having an aromatic vinyl compound content of 50% by mass or less. 2. The conductive resin composition according to claim 1, wherein the conductive carbon filler is 80 parts by mass or more and 200 parts by mass or less with respect to 100 parts by mass. The conductive resin according to claim 7, wherein the conductive resin has an electrical conductivity of 0.5 S / cm or more and 300 S / cm or less, an initial tensile modulus of 2000 MPa or less, an elongation at break of 5% or more, and a tensile strength at break of 5 MPa or more. A conductive sheet made of the composition. A collector electrode for a lithium ion battery using the conductive sheet according to claim 8.