JPH0615642B2 - Conductive composition for flexible sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a conductive composition for a flexible sheet which is rich in flexibility, has high mechanical strength, can be colored, and has excellent conductivity and electromagnetic wave shielding effect. It is about.

[Prior Art] Organic polymer materials such as synthetic resins and synthetic rubbers are used in all industrial fields by taking advantage of excellent properties and economical efficiency. However, since these are good electrical insulators, they are easily charged, and electronic precision parts such as ICs, combustible materials,
When used as a manufacturing facility or packaging material for dangerous substances such as explosives, a material having conductivity is used.

Generally, these materials, in which a conductive filler is mixed and dispersed in a synthetic resin, rubber or the like, are low in cost and suitable for mass production, and are currently widely used. Among them, carbon black has many advantages such as being easy to mold and having a reinforcing effect as compared with metal powders and fibers, and by adjusting the addition amount, one having an arbitrary conductivity can be obtained to some extent. However, it has the drawback that the formulation is limited to black, which naturally limits its use. In particular, it is not suitable for work benches, floors, walls, etc. for manufacturing electronic precision parts.

On the other hand, ethylene-vinyl acetate copolymer (hereinafter "EVA")
Abbreviated) and soft resins such as ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer rubber (hereinafter referred to as “E”).
It is also well known that a conductive rubber having flexibility by mixing and dispersing the conductive filler in a rubber such as "PR") is added, but most of them also have carbon black added, which causes the above problems. Have a point. Therefore, in order to obtain a conductive composition that has heat resistance, is highly flexible, and can be freely colored, EVA and EPR having the above-mentioned flexibility are provided.
When a metal-based filler other than carbon black is mixed and dispersed in, etc., practical conductivity cannot be imparted unless a large amount of filler is filled, mechanical strength is low, and heat resistance is poor. there were. Further, these are not only economically disadvantageous, but also have problems that the molded product is heavy and the surface becomes sticky.

[Problems to be Solved by the Invention] An object of the present invention is to have heat resistance and flexibility, in view of the above-mentioned current situation in a conductive material having flexibility.
Further, the present invention provides an electrically conductive composition for a flexible sheet, which can be colored freely and can exhibit practical electrically conductive performance with a smaller filler content, which is economically advantageous.

[Means for Solving Problems] As a result of diligent study of the above problems, the present invention uses an ethylene-α-olefin copolymer in a certain specific range, and thereby far more than conventional soft resins and rubbers. The inventors have reached the present invention by knowing that a composition having excellent conductivity can be obtained.

That is, the present invention, the conductive metal-based filler 5 to 85 parts by weight, and the boiling n-hexane insoluble content is 10 wt% or more, the maximum peak temperature shown by differential scanning calorimetry (DSC) exists at 100 ° C or more, Density is 0.86-0.92g /
It is intended to provide a conductive composition for a flexible sheet, which comprises 15 to 95 parts by weight of a resin containing an ethylene-α-olefin copolymer as a main component in a cm ³ range.

The specific ethylene-α-olefin copolymer used in the present invention has a boiling n-hexane insoluble content (hereinafter referred to as “C ₆ insoluble content”) of 10% by weight or more, and a differential scanning calorimetry (hereinafter referred to as “DSC”). ) Maximum peak temperature (hereinafter "Tm")
Is present at 100 ° C. or higher, and the density is 0.860 to
It is an ethylene-α-olefin copolymer in the range of 0.920 g / cm ³ . The α-olefin copolymerized with ethylene is an olefin having 3 to 12 carbon atoms, and specifically, propylene, butene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1, dodecene. -1
And so on. Of these, particularly preferred are propylene, butene-1, 4-methylpentene-1 and hexene-1. Further, dienes such as butadiene and 1,4-hexadiene can be used in combination as a comonomer. Α in ethylene-α-olefin copolymer
-Olefin content is preferably from 5 to 40 mol%.

Hereinafter, a method for producing a copolymer of ethylene and α-olefin used in the present invention will be described.

First, the catalyst system used is, for example, a so-called Ziegler catalyst in which a solid catalyst component containing magnesium and titanium is combined with an organoaluminum compound. Examples of the solid catalyst component include metal magnesium and hydroxide. Magnesium, magnesium carbonate, magnesium oxide, magnesium chloride, etc., or a double salt, double oxide, carbonate, chloride or hydroxide containing a metal selected from silicon, aluminum, calcium and a magnesium atom, and the like. Inorganic solid compounds treated with oxygen-containing compounds, sulfur-containing compounds, aromatic hydrocarbons, halogen-containing substances, etc., or reacted with magnesium-containing inorganic solid compounds carrying titanium compounds by known methods and so on.

Examples of the oxygen-containing compound include organic oxygen-containing compounds such as water, alcohols, phenols, ketones, aldehydes, carboxylic acids, esters, polysiloxanes and acid amides, and inorganic compounds such as metal alkoxides and metal oxychlorides. There are oxygen compounds. As the sulfur-containing compound, thiol, organic sulfur-containing compounds such as thioether,
And inorganic sulfur compounds such as sulfur dioxide, sulfur trioxide and sulfuric acid. As the aromatic hydrocarbon, benzene,
There are various monocyclic and polycyclic aromatic hydrocarbon compounds such as toluene, xylene, anthracene and phenanthrene. Examples of the halogen-containing substance include compounds such as chlorine, hydrogen chloride, metal chlorides and organic halides.

Examples of titanium compounds include titanium halides, alkoxy halides, alkoxides, and halogenated oxides. As the titanium compound, a tetravalent titanium compound and a trivalent titanium compound are preferable, and as the tetravalent titanium compound, specifically, those represented by general Ti (OR) _n X _4-n are preferable. . Here, R represents an alkyl group having 1 to 20 carbon atoms, an aryl group or an aralkyl group, X represents a halogen atom, and n is 0 ≦ n ≦ 4. For example, titanium tetrachloride, titanium tetrabromide, titanium tetraiodide, monomethoxytrichlorotitanium, dimethoxydichlorotitanium, trimethoxymonochlorotitanium, tetramethoxytitanium, monoethoxytrichlorotitanium, diethoxydichlorotitanium, triethoxymonochlorotitanium, tetra Ethoxytitanium, monoisopropoxytrichlorotitanium, diisopropoxydichlorotitanium, triisopropoxymonochlorotitanium, tetraisopropoxytitanium, monobutoxytrichlorotitanium, dibutoxydichlorotitanium, monopentoxytrichlorotitanium, monophenoxytrichlorotitanium, diphenoxydichloro. Examples include titanium, triphenoxymonochlorotitanium, tetraphenoxytitanium and the like.

Examples of the trivalent titanium compound include titanium tetrahalide such as titanium tetrachloride and titanium tetrabromide, hydrogen, aluminum,
Titanium or a titanium trihalide obtained by reduction with an organometallic compound of a metal of Group I to Group III of the periodic table can be used. In addition, the general formula Ti (OR) _m X _4-m (R is carbon number 1
~ 20 alkyl groups, aryl groups or aralkyl groups,
X is a halogen atom, and m is a trivalent halogenated alkoxytitanium represented by 0 <m <4), which is obtained by reducing an organometallic compound of a metal of Group I to Group III of the periodic table. The titanium compounds of

Of these titanium compounds, tetravalent titanium compounds are particularly preferable.

As another example of the catalyst system, a catalyst system in which a reaction product of an organomagnesium compound such as a so-called Grignard reagent and a titanium compound is used as a solid catalyst component, and an organoaluminum compound is combined therewith can be exemplified. . Examples of the organomagnesium compound include organomagnesium compounds represented by the general formulas RMgX, R ₂ Mg, RMg (OR), etc.
(R is an organic residue having 1 to 20 carbon atoms, X is a halogen atom) and their ether complexes, and these organomagnesium compounds are further substituted with other organometallic compounds, for example, organic sodium, organic lithium, organic potassium, Those modified by adding various compounds such as organic boron, organic calcium, and organic zinc can be used.

As another example of the catalyst system, as a solid catalyst component, Si
Use a solid substance obtained by contacting the above-mentioned solid catalyst component containing at least magnesium and titanium with an inorganic oxide such as O ₂ or Al ₂ O _3, and exemplify a combination of this with an organoaluminum compound. You can Examples of the inorganic oxide include SiO ₂ , Al ₂ O ₃ , CaO, B ₂ O ₃ , SnO _{2 and the} like, and a complex oxide of these oxides can be used without any trouble.

As a method for bringing these various inorganic oxides into contact with the solid catalyst component containing magnesium and titanium, known methods can be adopted. That is, there are a method of reacting in the presence or absence of an inert solvent at a temperature of 20 to 400 ° C., preferably 50 to 300 ° C. for usually 5 minutes to 20 hours, a method of co-milling treatment, and the like. The reaction may be carried out by appropriately combining the above methods.

In these catalyst systems, the titanium compound can be used as an adduct with the organic carboxylic acid ester, or can be used after the above-mentioned inorganic solid compound containing magnesium is contact-treated with the organic carboxylic acid ester. In addition, the organoaluminum compound may be used as an adduct with the organic carboxylic acid ester. Furthermore,
In all cases, the use of catalyst systems prepared in the presence of organic carboxylic acid esters can also be carried out without any problems.

Here, as the organic carboxylic acid ester, various aliphatic,
Alicyclic and aromatic carboxylic acid esters are used, and among them, aromatic carboxylic acid esters having 7 to 12 carbon atoms are preferable. Specific examples thereof include benzoic acid, anisic acid, and alkyl esters of toluic acid such as methyl and ethyl.

Specific examples of the organoaluminum compound to be combined with the above solid catalyst component include the general formulas R ₃ Al, R ₂ AlX and RAl.
Organoaluminum compounds of X ₂ , R ₂ AlOR, RAl (OR) X and R ₃ Al ₂ X ₃ (R is an alkyl group having 1 to 20 carbon atoms, an aryl group or an aralkyl group, X is a halogen atom, and R is The same or different) are preferable, and triethyl aluminum, triisobutyl aluminum, trihexyl aluminum, trioctyl aluminum, diethyl aluminum chloride, diethyl aluminum ethoxide, ethyl aluminum sesquichloride, and a mixture thereof, etc. Is mentioned.

The amount of the organoaluminum compound used is not particularly limited, but is usually 0.1 to 1,000 with respect to the titanium compound.
It can be used in molar times.

Also, after contacting the catalyst system with an α-olefin,
By using it in the polymerization reaction, the polymerization activity can be greatly improved and the reaction can be carried out in a more stable state than in the case of no treatment. As the α-olefin used at this time, there are various ones, but preferably one having 3 carbon atoms.
Is an α-olefin having 12 to 12, more preferably an α-olefin having 3 to 8 carbon atoms. Examples of these α-olefins are propylene, butene-1, pentene-1, 4-methylpentene-1, hexene-1, octene-1, decene-1, dodecene-1 and mixtures thereof. The temperature and time for contacting the catalyst system with the α-olefin can be selected within a wide range, for example from 0 to
The contact treatment can be performed at 200 ° C., preferably 0 to 110 ° C. for 1 minute to 24 hours. The amount of α-olefin to be contacted can be selected within a wide range, but usually, 1 g to 50 kg, preferably about 5 g to 30 kg of α-olefin is treated per 1 g of the solid catalyst component, and 1 g to 500 g per 1 g of the solid catalyst component. It is desirable to react the α-olefin of At this time, the pressure at the time of contact can be arbitrarily selected, but normally it is desirable to contact under a pressure of -1 to 100 kg / cm ² · G.

When treating the α-olefin, after combining the total amount of the organoaluminum compound used with the solid catalyst component,
It may be contacted with an α-olefin. In addition, even if a part of the organoaluminum compound to be used is combined with the solid catalyst component and then contacted with α-olefin, the remaining organoaluminum compound may be added separately during the polymerization to carry out the polymerization reaction. Good. Further, even if hydrogen gas coexists at the time of contact between the catalyst system and the α-olefin, nitrogen gas,
There is no problem even if an inert gas such as argon or helium coexists.

The polymerization reaction is carried out in the same manner as the usual olefin polymerization reaction using a Ziegler type catalyst. That is, all the reactions are carried out in the absence of oxygen, water, etc. in the gas phase or in the presence of an inert solvent, or using the monomer itself as a solvent. The polymerization conditions of olefin are that the temperature is 20 to 30.
The temperature is 0 ° C., preferably 40 to 200 ° C., and the pressure is atmospheric pressure to 70 kg / cm ² · G, preferably 2 kg / cm ² · G to 6
It is 0 kg / cm ² · G. The molecular weight can be adjusted to some extent by changing conditions such as the polymerization temperature and the molar ratio of the catalyst, but it is effectively performed by adding hydrogen to the polymerization system. Of course, it is possible to carry out a multi-step polymerization reaction of two steps or more with different polymerization conditions such as hydrogen concentration and polymerization temperature without any trouble.

The density (according to JIS K 6760) of the ethylene-α-olefin copolymer of the present invention obtained as described above is 0.86.
0 to 0.920 g / cm ³ , preferably 0.870 to 0.9
It is 10 g / cm ³ , the Tm by DSC is 100 ° C or higher, preferably 110 ° C or higher, and the C ₆ insoluble content is 10% by weight or higher, preferably 20 to 95% by weight. Density 0.8
When it is 60 g / cm ³ or less, the tensile strength is inferior and the surface of the molded product becomes sticky, which is not preferable. Also, the density is 0.920 g / c
If it is m ³ or more, the composition becomes hard and is not suitable for applications such as sheets.

If the Tm is 100 ° C. or lower, the heat resistance of the composition is poor, which is not preferable for practical use. Further, if the C ₆ insoluble content is 10% by weight or less, a composition having high conductivity cannot be obtained, the tensile strength becomes low, and the surface of the molded article becomes sticky, which is not preferable.

The methods for measuring the C ₆ insoluble matter and DSC in the present invention are as follows.

[Measurement method of C ₆ insoluble matter] A sheet having a thickness of 200 μm is formed by using a heat press, and three 20 mm × 30 mm sheets are cut from the sheet, and the sheet is cut with a double-tube Soxhlet extractor. Extraction is carried out with boiling n-hexane for 5 hours. The n-hexane insoluble matter is taken out, vacuum dried (7 hours, under vacuum, 50 ° C.), and then the C ₆ insoluble matter is calculated by the following formula.

[Method of measuring Tm by DSC] Approximately 5 mg from a 100 μm thick film hot-pressed
Weigh a sample of the sample, set it in the DSC device, and
After raising the temperature to 0 ° C. and holding at that temperature for 15 minutes, it is cooled to 0 ° C. at a temperature decreasing rate of 2.5 ° C./min. Next, from this state, the temperature is raised to 170 ° C. at a temperature rising rate of 10 ° C./minute, and measurement is performed. Of the peaks that appeared while the temperature was raised from 0 ° C to 170 ° C, the temperature at the apex of the maximum peak was taken as Tm.

The conductive metal-based filler of the present invention, a powdered metal body,
Fibrous bodies, metals or metal oxides composed of flakes, metal coatings, and the like, and specific metals thereof include aluminum, iron, zinc, cobalt, nickel, chromium, titanium, manganese, antimony, Copper, gold,
At least one selected from the group consisting of silver, tin, etc., and alloys thereof can be used.

Particularly in the present invention, the metal oxide and the mixture thereof exhibit a remarkable effect. Known among these metal oxides are zinc oxide having an aluminum oxide film formed on its surface, and titanium oxide or tin oxide having an antimony oxide film formed thereon.

The composition of the present invention contains 15 to 95% by weight of a resin component containing the ethylene-α-olefin copolymer in the specific range as a main component, and 5 to 85% by weight of a conductive metal filler, preferably resin component / Filler ratio is 20-90 / 10-80
(Weight), and more preferably in the range of 30-80 / 20-70 (weight). If the amount of the metal-based filler is less than 5% by weight, the effect of conductivity is small, while if it exceeds 85% by weight, the moldability is poor and the mechanical strength is low, and therefore the molded product becomes hard and brittle.

Further, in the present invention, an olefin polymer composition containing ethylene-α-olefin as a main component may be used, but the composition ratio of the ethylene-α-olefin copolymer and the olefin polymer is ethylene. The content of -α-olefin copolymer is 60% by weight or more, preferably 70% by weight or more.

As the above-mentioned olefin polymer, olefin homopolymers such as polyethylene, polypropylene, polybutene-1, poly-4-methyl-pentene-1, or ethylene-α-olefin copolymers in the above specific range are excluded. Ethylene, propylene, butene-1,4-methyl-pentene-1, hexene-1, octene-1, etc. intercopolymer, ethylene-propylene copolymer rubber (EPR),
Ethylene-propylene-diene copolymer rubber (EPD
M), ethylene and vinyl ester, unsaturated carboxylic acid,
Examples thereof include copolymers with unsaturated carboxylic acid esters and the like, polyisobutylene and mixtures thereof.

The composition of the present invention includes a metal oxide and an ethylene-α-olefin copolymer, an antioxidant, an ultraviolet absorber,
An antioxidant, a metal deactivator, a lubricant, a plasticizer, an antiblocking agent, a nucleating agent, a flame retardant, a coloring agent and the like can be added as appropriate. Further, it is also effective to use other conductive fillers together so as not to impair the coloring property.

Further, when the surface of the metal oxide is treated with a surface treating agent or a coupling agent in producing the composition of the present invention, the kneading operation is facilitated and the dispersion of the metal oxide is improved, which is preferable. Particularly preferred formulations lead to improved strength and toughness. The surface treatment agent used here includes
There are fatty acids such as stearic acid, oleic acid, and palmitic acid, resin acids and their metal salts, or amide compounds. Coupling agents include titanate-based, silane-based,
There are aluminate type, zircoaluminate type and the like. Typical examples of these titanates include isopropyl tristearoyl titanate, isopropyl tridodecylbenzenesulfonyl titanate,
Isopropyl tris (dioctyl pyrophosphate)
There are titanate, tetraisopropyl bis (dioctyl phosphite) titanate, bis (dioctyl pyrophosphate) oxyacetate titanate and the like, and as silanes, vinyltrichlorosilane, vinyltriethoxysilane, γ-aminopropyltriethoxysilane,
Examples include γ-mercaptopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and hexamethyldisilazane.

When these surface treating agents or coupling agents are used in the present invention, the amount of the surface treating agent or coupling agent used is 0.
The range of 1 to 10 parts by weight is preferable. Generally, if the amount is 0.1 parts by weight or less, the effect is not exhibited, and even if the amount is 10 parts by weight or more, the effect is not further increased.

Various methods can be employed to produce the composition of the present invention. As an example, an ethylene-α-olefin copolymer and a metal oxide (which have been surface-treated as necessary, the same applies hereinafter) are melt-kneaded with a Banbury mixer or a pressure kneader, and then rolled into a sheet. There is a method of forming into a shape and then pelletizing, or by directly melt-kneading with a roll and pelletizing.

As another example, there is a method of directly pelletizing with a kneading extruder or a twin-screw extruder. At this time, both raw materials may be mixed in advance and then supplied to the extruder, or both may be supplied separately. . Since this is a continuous production method, the productivity is higher than that of the former batch method such as the Banbury mixer method or roll method, which is a preferable method.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples.
The ethylene-α-olefin copolymer used in this example was prepared using a solid catalyst component obtained from substantially anhydrous magnesium chloride, 1,2-dichloroethane and titanium tetrachloride and a catalyst consisting of triethylaluminum. , Ethylene and propylene or butene-1 are polymerized.

Example 1 50 parts by weight of conductive zinc oxide powder "23-K" (trade name, manufactured by Shiramizu Chemical Industry Co., Ltd.) and isopropyl tristearoyl titanate (Ajinomoto) as a titanate coupling agent.
2 parts by weight of "TTS" manufactured by Co., Ltd.) were mixed with a Henschel mixer to obtain titanate-treated zinc oxide. This zinc oxide 40
Parts by weight, density: 0.906 g / cm ³ , melt index (MI): 11 g / 10 minutes, Tm: 121 ° C., C ₆ insoluble content: 87
Copolymer of 50% by weight of ethylene and propylene (powder)
Mixing parts by weight with a Henschel mixer, screw extruder with a screw diameter of 50 mm ("NVC-50" manufactured by Nakatani Machinery Co., Ltd.)
Was used to produce the composition (pellet) of the present invention. Using these pellets, a sheet having a thickness of 0.7 mm was formed by a sheet forming machine having a T die. The electrical conductivity (volume resistivity) of this sheet was 3 × 10 ⁶ Ω · cm, and it had electrical conductivity that could be used as an antistatic sheet. This sheet also has good flexibility and a tensile strength of 54 kg / c.
The sheet had m ² and a tensile elongation of 810%, which were favorable physical properties as a sheet.

(Note) The tensile test was based on JIS K 6760.

Example 2 As an ethylene-α-olefin copolymer, density: 0.
917 g / cm ³ , MI: 1.5 g / 10 minutes, Tm: 123 ° C., C ₆
Insoluble matter: A composition and a sheet were produced in the same manner as in Example 1 except that a copolymer of ethylene and butene-1 of 98% by weight was used. The obtained sheet had good flexibility, the volume resistivity was 2 × 10 ⁶ Ω · cm, the tensile strength was 66 kg / cm ² , and the tensile elongation was 730%.

Example 3 Example 1 except that 70 parts by weight of 23-K, 2.8 parts by weight of TTS and 27.2 parts by weight of ethylene-propylene copolymer were used.
The composition and sheet were prepared in the same manner as in. The obtained sheet has good flexibility and a volume resistivity of 7
× 10 ⁴ Ω · cm, tensile strength 51 kg / cm ² , tensile elongation 71
It was 0%.

Example 4 40 parts by weight of tin oxide / antimony oxide powder (“T-1” manufactured by Mitsubishi Metals Co., Ltd.) as a conductive oxide, 1.8 parts by weight of TTS, and 58.2 of ethylene-propylene copolymer. A composition and a sheet were produced in the same manner as in Example 1 except that the parts by weight were used. The obtained sheet has good flexibility,
Volume resistivity is 4 × 10 ⁷ Ω · cm, tensile strength is 56 kg / c
The m ² and the tensile elongation were 790%.

Example 5 The same procedure as in Example 1 was carried out except that 40 parts by weight of aluminum flakes (manufactured by Scientific Advance Co., USA) was used instead of the zinc oxide in Example 1, and as a result, the volume resistivity was 3 × 10 ^2. It was Ω · cm.

Comparative Example 1 As an ethylene-α-olefin copolymer, density: 0.
860 g / cm ³ , MI: 1.9 g / 10 min, Tm: 32 ° C. (small peak), C ₆ insoluble content: 0% ethylene-propylene rubber (trade name: EP02P, manufactured by Nippon Synthetic Rubber Co., Ltd.) The composition and sheet were prepared in the same manner as in Example 1 except that they were used. The obtained sheet has good flexibility, but the sheets are sticky, the tensile strength is 10 kg / cm ² , the tensile elongation is 700%, and the volume resistivity is 10 ⁸ Ω · cm or more. It was

Comparative Example 2 Instead of the ethylene-α-olefin copolymer, MI: 20
The composition and sheet were prepared in the same manner as in Example 1 except that EVA with a vinyl acetate content of 20% g / 10 min was used. The obtained sheet had good flexibility, but the tensile strength was 123 kg / cm ² , the tensile elongation was 70%, and the volume resistivity was 10 ⁸ Ω · cm or more.

[Effects of the Invention] As described above, the composition of the present invention uses white conductive powder, and thus can be freely colored, and uses a soft ethylene-α-olefin copolymer. Therefore, it has various characteristics that it is rich in flexibility, excellent in strength and elongation, and particularly good in conductivity.
Further, it has an advantage that it can be easily formed.

Therefore, the composition of the present invention is particularly suitable for a sheet-shaped molded product, such as floor sheets of clean rooms such as IC factories, wall materials, work benches, mats, floors and mats of factories handling hazardous materials, computers, etc. It can be suitably used for attaching inside of IC carrying containers such as floor sheets and desk mats of rooms. Further, as a film-shaped molded product, it can be used as a packaging material for electronic parts, a curtain in a clean room, and the like.

Furthermore, it can also be utilized as an electrostatic dissipator, an electric heating element, and an electromagnetic wave shielding material (EMI).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // H05B 3/14 Z 7913-3K H05F 3/00 7028-5G H05K 9/00 X 7128-4E

Claims (2)

[Claims] 1. A conductive metal-based filler of 5 to 85 parts by weight, a boiling n-hexane insoluble content of 10% by weight or more, a maximum peak temperature shown by differential scanning calorimetry of 100 ° C. or more, and a density of 0. Resin 1 containing ethylene-α-olefin copolymer in the range of 0.86 to 0.92 g / cm ³ as a main component
A conductive composition for a flexible sheet, which comprises 5 to 95 parts by weight. 2. The conductive composition for a flexible sheet according to claim 1, wherein the conductive metal-based filler is a metal oxide.