JP2001072871A - Resin composition, conductive roller formed by molding the same, and cartridge for electrophotography - Google Patents

Abstract

(57) [Summary] [Problem] It is excellent in adhesion to core material, durability and conductivity,
Provided is a resin composition suitable for a conductive roller having excellent physical properties such as hardness and compression set. A resin resin composition comprising a thermoplastic elastomer and a copolymer having a carboxylate anion and a metal cation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin composition and a conductive roller formed by molding the same. More specifically, a thermoplastic elastomer, a carboxylate anion, a resin composition containing a metal cation, a thermoplastic elastomer, a carboxylate anion, a metal cation,
The present invention relates to a conductive resin composition containing a conductive filler and a conductive roller obtained by molding the same, which can be used for OA equipment parts, automobiles, home electric parts, medical and food equipment parts, electric wires, miscellaneous goods, and the like. .

[0002]

2. Description of the Related Art Vulcanized rubber is widely used in the fields of OA equipment parts, automobiles, home electric appliance parts, medical and food equipment parts, electric wires, miscellaneous goods, and the like. Therefore, a material that does not require these steps is desired. As a substitute for vulcanized rubber, a thermoplastic elastomer that does not require a vulcanization step is used, but since it does not have a three-dimensional cross-linked part, it is weak to stress deformation and has inferior physical properties of compression set to vulcanized rubber There were fields that could not be replaced.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin suitable for a conductive roller excellent in adhesiveness to a core material, durability and conductivity, and excellent in physical properties such as hardness and compression set. It is to provide a composition.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, have found that a specific resin composition has a good compression set value, and reached the present invention. did. That is, the gist of the present invention resides in a resin composition containing a thermoplastic elastomer and a copolymer having a carboxylate anion and a metal cation. Another gist of the present invention resides in a conductive roller formed by molding the above resin composition. Another aspect of the present invention resides in an electrophotographic cartridge including the above-described conductive roller as a charging roller.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. ○ Thermoplastic Elastomer The thermoplastic elastomer used in the present invention is not particularly limited, but one or more thermoplastic elastomers selected from styrene-based elastomers, olefin-based elastomers, ester-based elastomers, and amide-based elastomers are preferred. Particularly preferred thermoplastic elastomers include styrene-based thermoplastic elastomers and / or
Alternatively, an olefin-based thermoplastic elastomer can be used. The physical properties of these thermoplastic elastomers are not particularly limited, but the flexural modulus according to JIS-K7203 is less than 5,000 kg / cm ² , preferably less than 4,000 kg / cm ² , and more preferably less than 3,000 kg / cm ^2.
It is less than 0 kg / cm ² .

[0006] Preferable examples of the olefin-based thermoplastic elastomer used in the present invention include olefin-based copolymer rubbers such as ethylene-propylene copolymer rubber (EPM) and ethylene-propylene-non-conjugated diene copolymer rubber ( (EPDM) or other elastomers of amorphous random copolymers containing olefins as the main component, or those containing heat-treated elastomers cross-linked mainly by radicals as a basic component, in the presence of organic peroxides Can be mentioned.

Specific examples of the olefin-based copolymer rubber include the above-mentioned ethylene-propylene copolymer rubber (EPM),
Ethylene / 1-butene copolymer rubber (EPM), ethylene / propylene / butene copolymer rubber, ethylene / hexene copolymer, ethylene / heptene copolymer, ethylene / octene copolymer, ethylene / 4-methylpentene-1 As copolymers and non-conjugated dienes, butene-1,1,4-
Examples thereof include ethylene-propylene / non-conjugated diene copolymer rubbers using aliphatic dienes such as hexadiene, 5-ethylidene norbornene, 5-methylnorbornene, 5-vinylnorbornene, dicyclopentadiene, dicyclooctadiene, and the like.

[0008] These copolymers or copolymer rubbers include random copolymers, block copolymers, graft copolymers,
Any of the alternating copolymers may be used, and the production method and shape are not particularly limited. These olefin-based copolymer rubbers may be used alone or in combination of a plurality of components. These olefin-based copolymer rubbers have a weight average molecular weight of 50,000 to 1,000,000, preferably 60,000 to 800,000, and particularly preferably 8 to 800,000.
000-500,000, ethylene content 30-
90% by weight, preferably 40 to 80% by weight, and a Mooney viscosity ML _{1 + 4} (100 ° C.) of 5 to 400, preferably 10
It is preferable to use a copolymer rubber having a size of from 350 to 350.

When the weight average molecular weight of the ethylene / propylene copolymer rubber is less than the above range, rubber elasticity,
Those having a tendency to have poor mechanical strength and a weight average molecular weight exceeding the above range tend to have poor moldability. Here, the “weight average molecular weight” is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions.

(Conditions) Equipment; 150C ALC / GP
C (manufactured by MILLIPORE) Column: polystyrene mixed gel column Solvent: o-dichlorobenzene Temperature: 140 ° C. Concentration: 2 mg / ml (0.2% of antioxidant 2,6-di-t-butyl-4-methyl-phenol (The concentration was measured at a wavelength of 3.42 μm using an infrared spectrophotometer.)

The olefin-based thermoplastic elastomers contained as the olefin-based copolymer rubber base are, for example, "Thermolan" manufactured by Mitsubishi Chemical Corporation, "Milastomer" manufactured by Mitsui Petrochemical Industry Co., Ltd., and Sumitomo Chemical Co., Ltd. It can be obtained from the market as "Sumitomo TPE" manufactured by Kogyo Co., Ltd. or "Santoprene" manufactured by Advanced Elastomer Systems.

The styrene thermoplastic elastomer used in the present invention is preferably a styrene / butadiene block copolymer hydrogenated product, a styrene / isoprene block copolymer hydrogenated product, or a mixture thereof. Examples include those containing a selected styrene / conjugated diene block copolymer hydrogenated product as a basic component. As a hydrogenated product of the styrene / conjugated diene block copolymer, the conjugated diene is a polymer block consisting of butadiene alone, isoprene alone, or a mixture of isoprene and butadiene. Hydrogenated styrene block copolymer (hereinafter sometimes simply referred to as “hydrogenated SBS”),
Hydrogenated styrene / isoprene / styrene block copolymer (hereinafter sometimes simply referred to as “hydrogenated SIS”) or hydrogenated styrene / isoprene / butadiene / styrene block copolymer (Hereinafter sometimes simply referred to as “hydrogenated S-BI-S”). These hydrogenated styrene / conjugated diene block copolymers have a weight average molecular weight of 50,000.
~ 500,000, preferably 120,000-45
000, particularly preferably 150,000 to 400,
Styrene content of 5 to 50% by weight, preferably 8 to 45% by weight, particularly preferably 10 to 40% by weight,
A block copolymer having a 1,2-microstructure of less than 50%, preferably less than 45%, and a hydrogenation rate of 95% or more, preferably 97% or more is used.

The "weight average molecular weight" is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions. (Conditions) Equipment; 150C ALC / GPC (MILL
Column: polystyrene mixed gel column Solvent: o-dichlorobenzene Temperature: 140 ° C Concentration: 2 mg / ml (0.2% by weight of antioxidant 2,6-di-t-butyl-4-methyl-phenol) (The concentration was measured at a wavelength of 3.42 μm using an infrared spectrophotometer.)

If the weight average molecular weight of the hydrogenated styrene / conjugated diene block copolymer is less than 50,000, rubber elasticity and mechanical strength tend to be poor, and if it exceeds 500,000, moldability tends to be poor. Become. As a method for producing a hydrogenated product of these styrene / conjugated diene block copolymers, for example, a method described in Japanese Patent Publication No. 23798/1973 may be used. Synthesize a copolymer,
Then, for example, JP-B-42-8704, JP-B-43
No.-6636, JP-A-59-133203, JP-A-6-133203
According to the method described in each publication of JP-A-0-79005, there can be mentioned a method of hydrogenation in an inert solvent in the presence of a hydrogenation catalyst.

Also, hydrogenated SIS and hydrogenated S-BI
-S is disclosed in JP-A-2-102212 and JP-A-3-1321.
No. 88114, i.e., styrene and isoprene or isoprene-butadiene are converted to 100
Parts by weight, 0.01 to 0.2 parts by weight of an alkyllithium compound as an initiator and 0.04 to 0.8 parts by weight of a coupling agent, and 0.1 to 100 parts by weight of an initiator.
It is obtained by sequentially polymerizing in an inert catalyst at -20 to 80 ° C. for 1 to 50 hours in the presence of ４００400 parts by weight of a Lewis base, and then hydrogenating isoprene or isoprene-butadiene block.

Commercially available products include "Clayton G" manufactured by Shell Japan, "Septon" and "Hibler" manufactured by Kuraray Co., Ltd., "Toughtec" manufactured by Asahi Kasei Kogyo, "Dynalon" manufactured by Nippon Synthetic Rubber Co., Ltd. Styrene-based thermoplastic elastomers containing a hydrogenated styrene-conjugated diene block copolymer as a base include, for example, "Lavalon" manufactured by Mitsubishi Chemical Corporation and "Clayton G Compound" manufactured by Shell Japan Co., Ltd. And "Septon Compound" manufactured by Kuraray Co., Ltd., and "TUFTEC Compound E Series and S Series" manufactured by Asahi Kasei Corporation.

○ Carboxylic acid anions and metal cations
The carboxylate anion and metal cation used in the present invention
Examples of the copolymer having an ON include the following:
You. The metal cation is not particularly limited.
But Na⁺, K⁺, Ag ⁺, Li +, Cu²⁺, C
a²⁺, Ba²⁺, Zn²⁺, Mg²⁺, Fe³⁺And Fe³⁺From
One or more cations selected from the group consisting of
Furthermore, Na⁺, K⁺, Ag⁺, Cu²⁺, Ca²⁺, Ba
²⁺, Zn²⁺, And Fe³⁺One or more selected from the group consisting of
The above cations are preferred, especially Na⁺And Zn²⁺Hope
Good. The carboxylate anion is represented by the formula (1)
Repeating unit represented by the following formula (2)
Those having units are desirable,

[0018]

Embedded image —CHR ¹ CHR ² — (1)

(In the formula (1), R ¹ and R ² each represent an alkyl group and preferably have 1 to 3 carbon atoms.)

[0020]

-CHR ³ CR ⁴ COO ^- M ⁺ -(2)

(In the formula (2), R ³ and R ⁴ each represent an alkyl group and preferably have 1 to 3 carbon atoms. M ⁺
Represents a metal cation. As the main chain, a copolymer of an olefin and / or an olefin derivative and an acid-modified olefin is preferably used, and as the acid-modified olefin, methacrylic acid, acrylic acid, maleic acid and the like are particularly preferably used. In particular,
Those composed of ethylene (or butadiene) and acrylic acid (or methacrylic acid) are preferred.
Those which are methacrylic acid copolymers and / or butadiene-acrylic acid copolymers are preferred.

The quantitative ratio of the repeating unit represented by the formula (1) to the repeating unit represented by the formula (2) is 1: 1.
It is preferably from 00 to 100: 1. As the copolymer, an ionomer is particularly preferable, and a zinc ionomer and a sodium ionomer are suitably used.

○ Resin composition The contents and production methods of the resin composition containing the thermoplastic elastomer and the copolymer used in the present invention will be exemplified below, but are not limited to these methods.・ Method of melt-mixing a copolymer with a thermoplastic elastomer A method of dispersing a copolymer containing a carboxylate anion and a metal cation in a thermoplastic elastomer. A resin composition containing a metal cation can be obtained.・ Method of using carboxylic acid of thermoplastic elastomer main chain If it is an ester elastomer or an amide elastomer, the terminal carboxylic acid is neutralized with a base to contain the thermoplastic elastomer, carboxylate anion and metal cation. A resin composition can be obtained.-A method of introducing an acid-modified olefin as a structural unit of a thermoplastic elastomer during polymerization. For an olefin-based elastomer or a styrene-based elastomer, an acid-modified olefin can be introduced as a structural unit during polymerization. it can. As the acid-modified olefin, methacrylic acid, acrylic acid, maleic acid and the like are particularly preferably used. These can be used for polymerization after neutralization at the monomer stage, or can be neutralized with a base after polymerization. A method of introducing a carboxylic acid by oxidizing a thermoplastic elastomer A carboxylic acid can be introduced by oxidizing a thermoplastic elastomer. For example, a carboxylic acid can be formed by oxidizing an unsaturated part with an oxidizing agent.

○ Conductive resin composition A conductive resin composition can be obtained by mixing the resin composition of the present invention having excellent compression set and a conductive filler. The conductive filler is used to exhibit suitable conductivity in using the resin composition of the present invention as a conductive resin composition, and is exemplified below.
It is not limited to these.

For example, carbon materials such as carbon black, graphite, and carbon fibers; metal powders such as aluminum and magnesium; metal materials such as metal fibers; metal oxide powders having been subjected to surface treatment; Is most preferred. As physical properties of carbon black, the average particle size of primary particles of carbon black is preferably from 5 to 300 nm, more preferably from 10 to 100 nm. This is because when the particle size is extremely large, the specific surface area tends to be small, and the conductivity tends to be poor. When the particle size is extremely small, the dispersibility in the matrix resin tends to be poor. The DBP refueling amount is 10 to 1000 mL / 100.
g, more preferably 50-300 mL / 100 g. If the DBP lubrication amount is extremely small, sufficient conductivity tends not to be obtained. Furnace black and acetylene black are mentioned as carbon blacks satisfying these preferred conditions. Specifically, "Denka Black Granules" manufactured by Denki Kagaku Co., Ltd. and "Mitsubishi Conductive Carbon Black # 3600" manufactured by Mitsubishi Chemical Co., Ltd. Such as from the market.

The mixing ratio of these conductive fillers varies depending on the desired level of conductivity and the change in resistance due to the difference in molding method. However, if the proportion is too small, the conductivity may not be stably exhibited, and the proportion may be too large. And physical properties may be deteriorated, such as increased hardness, so that 2 to 200 parts by weight, preferably 4 to 50 parts by weight with respect to 100 parts by weight of the resin,
More preferably, it is 5 to 25 parts by weight. The mixing method is not particularly limited, and it can be produced by a single-screw extruder, a twin-screw kneading extruder, a Banbury mixer, a roll, a Brabender, a plastograph, a kneader, or the like.

Of these, it is particularly preferable to use a twin-screw kneading extruder to mix and pelletize the mixture before molding. As the mixing procedure, the resin composition is first mixed, and may be mixed again with the conductive filler, or the thermoplastic elastomer and the copolymer and the conductive filler as raw materials of the resin composition may be mixed together. .

Additional components Any additional components may be added to the resin composition and conductive resin composition of the present invention according to the purpose within a range that does not significantly impair the effect. Additional additives include, for example, various additives, softeners, various thermoplastic resins,
Various elastomers can be exemplified. Specific examples of the additives include softeners for hydrocarbon rubbers, various plasticizers, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers,
Various additives such as a neutralizing agent, a lubricant, an anti-fogging agent, an anti-blocking agent, a slip agent, a crosslinking agent, a crosslinking aid, a coloring agent, a flame retardant, a dispersant, and an antistatic agent can be added.

The hydrocarbon rubber softener in the additional compounding material component can play an important role for controlling the processability and flexibility of the olefin-based and styrene-based thermoplastic elastomer compositions. . Such a softening agent for hydrocarbon rubber (the average molecular weight is generally 300 to 2,
000, preferably 500 to 1,500) is preferably added in an amount of 0 to 250 parts by weight, particularly preferably 20 to 200 parts by weight, based on 100 parts by weight of the resin composition or the conductive resin composition. Such a softening agent for a hydrocarbon rubber is a mixture of an aromatic ring, a naphthene ring and paraffin, wherein the number of carbon atoms in the paraffin chain accounts for 50% or more of the total carbon. Oils having a naphthene ring carbon number of 30 to 45% are called naphthenic oils, and oils having an aromatic carbon number of more than 30% are called aromatic oils. Among them, it is preferable to use paraffin oil.

The thermoplastic resin in the above-mentioned additional compounding material component includes polyolefin resins such as polypropylene, ethylene resin and polybutene-1 resin, polystyrene, acrylonitrile / styrene copolymer, acrylonitrile / butadiene / styrene copolymer. Polystyrene resins such as coalescing, polyphenylene ether resins, polyamide resins such as nylon 6, nylon 66, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyoxymethylene homopolymer,
A polyoxymethylene-based resin such as a polyoxymethylene copolymer, a polymethylmethacrylate-based resin, or the like can be used. As the ethylene resin, polyethylene,
Examples thereof include an ethylene / α-olefin copolymer, an ethylene / vinyl acetate copolymer, an ethylene / (meth) acrylic acid copolymer, and an ethylene / (meth) acrylate copolymer. Examples of the polyethylene include low-density polyethylene (branched ethylene polymer) and medium density,
High density polyethylene (linear ethylene copolymer) and the like can be mentioned.

The above-mentioned ethylene / α-olefin copolymer includes ethylene / butene-1 copolymer and ethylene / butene-1 copolymer.
Hexene copolymer, ethylene / heptene copolymer, ethylene / octene copolymer, ethylene-4-methylpentene-1 copolymer and the like can be mentioned as typical examples. One or more kinds of thermoplastic resins may be used. Resin composition or conductive resin composition 100
It is generally preferred to add 1 to 300 parts by weight, preferably 20 to 250 parts by weight, based on parts by weight.

Further, as the elastomer in the additional compounding material component, a polyester elastomer, a polyurethane elastomer, a polyamide elastomer, an olefin elastomer and the like can be used. One or more kinds of elastomers may be used. 0 to 300 parts by weight, preferably 0 to 10 parts by weight, based on 100 parts by weight of the resin composition or the conductive resin composition.
It is preferable to add 0 parts by weight.

○ Compression set of resin composition and conductive resin composition According to the present invention, a resin composition and a conductive resin composition having excellent compression set can be obtained. The compression set can be measured according to JIS K6301. Generally, thermoplastic elastomers are compared to vulcanized rubbers,
It is said that substitution is difficult in applications where permanent deformation is a problem because of high compression set. Although thermoplastic elastomers are dynamically crosslinked, thermoplastic elastomers with excellent compression set with the crosslinked rubber dispersed are also commercially available,
If the amount of the crosslinked rubber is too large, there are problems such as too hard and poor moldability during melt molding. In the present invention, for example, by only mixing a small amount of a copolymer (ionomer) with a normal thermoplastic elastomer, the compression set can be reduced by 10% or more compared to the original thermoplastic elastomer, so that other physical properties, moldability, etc. A resin composition having little influence on the resin composition can be obtained.

O Conductive Roller When the conductive resin composition of the present invention is used, it is possible to obtain a conductive roller which undergoes less deformation during use and has good contact with a member to be contacted. The configuration of the conductive roller of the present invention is not particularly limited, but a core having a high conductivity is preferable, and a metal made of metal is more preferable. As the type of metal, aluminum, nickel, stainless steel, or the like is preferable, and stainless steel, which is hard to rust and has high rigidity, is particularly preferable. The layer structure is not particularly limited, and may be a single layer or a stack of several layers having different resistance values. If necessary, a protective layer may be provided on the outer layer for the purpose of preventing contamination, adjusting resistance, and the like. In the case of a multilayer structure, any one of the layers may be constituted by the conductive resin composition of the present invention.

The method for producing the conductive roller of the present invention is not particularly limited. However, since the conductive resin composition of the present invention is usually thermoplastic, it can be molded by any method such as injection molding and extrusion molding. Can be done. For example, by using an extruder using a crosshead die, a cored bar can be inserted from one side, and the melted composition can be extruded from one side and molded integrally. Also, when molding a multilayer structure,
It may be formed sequentially from the center layer, or may be formed simultaneously by co-extrusion using a plurality of extruders and a crosshead die. The outermost layer may be formed by dip coating using a solution in which the components are dissolved, or may be coated using a heat-shrinkable tube.

Use of the Conductive Roller The use of the conductive roller of the present invention is not particularly limited, but it can be suitably used, for example, for an electrophotographic charging roller, a transfer roller, and a transport roller. A particularly preferred application is an electrophotographic cartridge used for a laser beam printer or the like. The electrophotographic cartridge means a replacement unit in which the conductive roller of the present invention is incorporated as a charging roller in a cartridge together with an electrophotographic photosensitive member, toner, and the like to facilitate maintenance and replacement of a laser beam printer.

[0037]

EXAMPLES (Examples 1 to 4 and Comparative Example 1) The composition ratios and measurement results of the elastomer compositions used in Examples and Comparative Examples are shown in the table. Details of each component in the table are as follows.

Styrenic thermoplastic elastomer: Lavalon T320C JIS-A hardness manufactured by Mitsubishi Chemical Corporation
18A ・ Carbon black: Denka Black granules, manufactured by Denki Kagaku Co., Ltd. ・ Copolymer: Himilan 1554 (Zn system), manufactured by DuPont Mitsui Polychemicals Co., Ltd. Himilan 1707 (Na system)

Each material was kneaded and granulated using a twin-screw kneading extruder. Next, a test piece (100 mm × 100 mm × 2 mm) was prepared by using an in-line screw type injection molding machine at a molding temperature of 190 to 240 ° C. and a mold temperature of 50 ° C.
Was molded and used for evaluation.

Evaluation atmosphere: Unless otherwise specified, measurements were made
The test was performed in an environment of 25 ° C. and 50% Rh. Hardness: JIS K6301 A type Compression set: JIS K6301 (70 ° C, 22 hours)

Example 1 By adding a conductive resin composition copolymer (ionomer) comprising a styrene-based elastomer, carbon black and 0.5 part of a zinc-based ionomer, the compression set of the molded product showed a low value of 41%. . The hardness was 32A.

Comparative Example 1 A molded article of a conductive resin composition comprising a styrene elastomer and carbon black exhibited a compression set of 43% and a hardness of 32A.

Example 2 By optimizing the amount of ionomer to be added to 1 part,
The compression set of the molded product was even lower at 38%. At this time, the hardness was 33 A, which was not a large change as compared with the ionomer-free product of Comparative Example 1.

Example 3 In Example 3 in which the amount of the ionomer was 3 parts, the addition was excessive, and the compression set was higher than that of Example 2, but lower than that of Comparative Example 1.

Example 4 Even when the ionomer was made of sodium, the compression set of the molded product was 39%, which was lower than that of Comparative Example 1.

[0046]

[Table 1]

[0047]

According to the present invention, it is possible to obtain a resin composition and a conductive resin composition having a small value of compression set and a comprehensive balance of properties such as hardness and moldability.
Further, by molding using the conductive resin composition of the present invention, a conductive roller having performance equal to or higher than the conductive roller using the conventional vulcanized rubber composition can be produced very easily. .

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16C 13/00 F16C 13/00 A 5G301 B G03G 15/02 101 G03G 15/02 101 15/16 103 15 / 16 103 H01B 1/24 H01B 1/24 Z // C08J 5/00 CEQ C08J 5/00 CEQ (72) Inventor Akira Watanabe 8-3 Chuo, Ami-cho, Inashiki-gun, Ibaraki Pref. Mitsubishi Tsukuba Research Laboratories F-term (reference) 2H003 BB11 CC05 2H032 AA05 BA19 BA23 3J103 AA02 AA21 BA34 BA41 FA02 FA06 FA12 GA02 GA14 GA52 GA69 HA03 HA12 HA20 HA32 HA38 HA41 HA53 4F071 AA10 AA12X AA15X AA22X AA31X AF18 AF37ABB BAB BAB16B01B18B01 5G301 DA18 DA42 DA43 DD08 DD10

Claims (12)

[Claims] 1. A resin composition comprising a thermoplastic elastomer and a copolymer having a carboxylate anion and a metal cation. 2. The method according to claim 1, wherein the metal cations are Na ⁺ , K ⁺ , A
The resin composition according to claim 1, wherein the resin composition is at least one cation selected from the group consisting of g ⁺ , Cu ²⁺ , Ca ²⁺ , Ba ²⁺ , Zn ²⁺ , and Fe ^3+. object. 3. The resin composition according to claim 1, wherein the copolymer has a repeating unit represented by the following formula (1) and a repeating unit represented by the following formula (2). . -CHR ¹ CHR ^2- (1) (In the formula (1), R ¹ and R ² each represent an alkyl group having 1 to 3 carbon atoms.) -CHR ³ CR ⁴ COO ⁻ M ⁺ − (2) (In the formula (2), R ³ and R ⁴ each represent an alkyl group having 1 to 3 carbon atoms, and M ⁺ represents a metal cation.) 4. The method according to claim 3, wherein the quantitative ratio of the repeating unit represented by the formula (1) to the repeating unit represented by the formula (2) is from 1: 100 to 100: 1. Resin composition. 5. The resin composition according to claim 3, wherein the copolymer is an ethylene-methacrylic acid copolymer and / or a butadiene-acrylic acid copolymer. 6. The resin composition according to claim 1, wherein the copolymer is a sodium ionomer and / or a zinc ionomer. 7. The resin composition according to claim 1, wherein the thermoplastic elastomer is a styrene-based elastomer and / or an olefin-based elastomer. 8. The conductive resin composition according to claim 1, further comprising a conductive filler. 9. The conductive resin composition according to claim 8, wherein the conductive filler is carbon black. 10. A conductive roller comprising a layer made of the conductive resin composition according to claim 1. Description: 11. The conductive roller according to claim 10, wherein the compression set is 40% or less. 12. An electrophotographic cartridge comprising the conductive roller according to claim 11 incorporated therein as a charging roller or a transfer roller.