JPS62119269A - Electrically conductive resin composition - Google Patents

Abstract

PURPOSE:A resin composition, obtained by incorporating a dispersion prepared by dispersing carbon black and carbon fibers together or separately in water with a resin solution or resin dispersion and having improved electric conductivity and dispersibility. CONSTITUTION:An electrically conductive resin composition obtained by initially dispersing (B) 30-100pts.wt. carbon black, preferably acetylene black or by- product carbon black, etc., having >=600m<2>/g expressed in terms of nitrogen adsorption, specific surface area and (C) 1-100pts.wt., preferably 5-50pts.wt. carbon fibers having preferably >=300mu length together or separately in water [to give <=15wt%, based on water, total of the components (B) and (C)], dispersing (A) 100pts.wt. thermoplastic resin, e.g. styrene-butadiene copolymer or polybutadiene, etc., in water or an organic solvent (to give >=10wt% solid content), mixing and stirring the components (B) and (C) with (A), removing the liquid components and preferably incorporating <=70pts.wt. softener, e.g. process oil, etc.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は導電性樹脂組成物に関するものである。[Detailed description of the invention] (Industrial application field) The present invention relates to a conductive resin composition.

（従来の技術） カーボンブラック（以下ｒＯＢＪと略記すも）や炭素繊
維をポリマーに含有させ導電性組成物を製造する方法と
しては特開昭！ター／θθ／４ｔｊ号公報で開示されて
いるように、パンバリＳキサ−等による通常の混合法、
即ち、ドライミックス法による方法が知られている。(Prior Art) A method for producing a conductive composition by incorporating carbon black (hereinafter abbreviated as rOBJ) or carbon fiber into a polymer was disclosed in Japanese Patent Application Laid-Open No. As disclosed in the Patent Publication No. Tar/θθ/4tj, the usual mixing method by Panbari S.
That is, a dry mix method is known.

（発明が解決しようとする問題点） しかしながら、かかる方法では導電性ＯＢのように一般
に比表面積の大きなＯＢを使用する場合は、均一に混合
することが困難であり、一定した品質のものが得られな
いという問題があった。更に、得られる組成物の導電性
が低く、その改良が望まれていた。(Problems to be Solved by the Invention) However, in this method, when using an OB with a large specific surface area, such as a conductive OB, it is difficult to mix uniformly, and it is difficult to obtain a uniform quality product. The problem was that I couldn't do it. Furthermore, the electrical conductivity of the obtained composition is low, and improvement thereof has been desired.

そこで向上された導電性組成物を得るべく、導電埋ＣＢ
とともに炭素繊維を混入することをこ着目し検討を行な
ったが、ドライミックス法では、均一混合が困難であり
、そのためには長時間の混線時間を必要とするため炭素
繊維はポリマー内部で必要以上に切断してしまい導電性
が著しく低下し、又、導電性を向上させるために炭素繊
維を多量に配合すると流動性が悪くなり。Therefore, in order to obtain an improved conductive composition, conductive embedded CB
At the same time, we focused on incorporating carbon fiber into the polymer, but with the dry mix method, it is difficult to mix uniformly, and this requires a long time for mixing, so carbon fiber is added inside the polymer more than necessary. If a large amount of carbon fiber is added to improve the conductivity, the fluidity will deteriorate.

加工性の低下を引き起こす等の問題があった。There were problems such as a decrease in workability.

（問題点を解決するための手段） そこで１本発明者等はかかる問題点に鑑み、得られる製
品の導電性を低下させることなく、しかも分散性の優れ
た導電性樹脂組成物の與造法について更に検討を行なっ
た結果、湿式法ζこよるマスターバッチ技術を応用する
ことにより上記問題点が解決されることを見い出し、本
発明に到達した。(Means for Solving the Problems) Therefore, in view of the problems, the present inventors have developed a method for producing a conductive resin composition with excellent dispersibility without reducing the conductivity of the resulting product. As a result of further investigation, it was discovered that the above problems could be solved by applying masterbatch technology based on the wet method ζ, and the present invention was achieved.

すなわち、本発明の目的は、導電性および分散性の優れ
た導電性樹脂組成物を提供するものである。That is, an object of the present invention is to provide a conductive resin composition having excellent conductivity and dispersibility.

そして、その目的はカーボンブラックと炭素繊維を共に
めるいは個別に水に分散させた分散液と、樹脂溶液ある
いは樹脂分散液とを混合する工程を経て得られる導電性
樹脂組成物であって、樹脂１００重量部に対してカーボ
ンブラックが３０〜１００重蓋部および炭素繊維が７〜
１００重量部含有されて碌る導電性樹脂組成物により容
易に達成される。The object is a conductive resin composition obtained through a process of mixing a dispersion in which carbon black and carbon fibers are dispersed together or individually in water, and a resin solution or a resin dispersion. Carbon black is 30 to 100 parts by weight and carbon fiber is 7 to 100 parts by weight based on 100 parts by weight of resin.
This can be easily achieved by using a conductive resin composition containing 100 parts by weight.

以下、本発明の詳細な説明する。The present invention will be explained in detail below.

本発明で用いる樹脂としては、公知の乳化重法、懸濁重
合法、溶液重合法あるいはバルク重合法等により得られ
る樹脂であって、具体的にはスチレン−ブタジェン共重
合体＜８ＢＲ）、ポリブタジェン（ＢＲ）、　アクリロ
ニトリル−ブタジェン共重合体（ＮＢＲ）、ポリクロロ
プレン（ＯＲ）、ポリインプレン（工Ｒ）、エチレン−
プロピレン共重合体（ＫＰＭ　、　ＫＩ’ＤＭ　）、フ
ッ素ゴム、インブチレン−イソプレン共重合体（エエＲ
）％シリコンゴム等のゴム状物質、ポリエチレン、ポリ
スチレン、ボリプａピレン、エチレン−酢酸ビニル共重
合体、ポリ塩化ビニル、ポリ酢酸ビニル等の熱可塑性樹
脂があげられる。The resin used in the present invention is a resin obtained by a known emulsion polymerization method, suspension polymerization method, solution polymerization method, or bulk polymerization method, and specifically, styrene-butadiene copolymer <8BR), polybutadiene copolymer (BR), acrylonitrile-butadiene copolymer (NBR), polychloroprene (OR), polyimprene (R), ethylene-
Propylene copolymer (KPM, KI'DM), fluororubber, inbutylene-isoprene copolymer (AER)
)% silicone rubber, and thermoplastic resins such as polyethylene, polystyrene, polypyrene, ethylene-vinyl acetate copolymer, polyvinyl chloride, and polyvinyl acetate.

′を九％ＯＢとしては公知のいずれのＯＢも使用するこ
とができるが、特に賦活処理を行なわなくともある祠度
の導電性付与能力を有するアセチレンブラックあるいは
副生カーボンブラック等の導電性ＯＢで、比表面積が窒
素吸ＭＩｌでイθθｍ’／ｆ以上のものを用いるのが好
ましい。Any known OB can be used as 9% OB, but conductive OB such as acetylene black or by-product carbon black, which has the ability to impart conductivity with a certain degree of purity without the need for activation treatment, can be used. It is preferable to use a material having a specific surface area of θθm′/f or more in terms of nitrogen absorption MIl.

また１本発明で用いる炭素繊維は、市販のものが用いら
れ。市販のものとしては、ポリアクリロニトリルやピッ
チ類を繊維状とし、これを耐炎化もしくは不融化し、さ
らに焼成した炭素繊維、又炭化水素ガスを熱分解させる
と共に、これを気相成長式ぜて繊維化した炭素繊維等が
あるが、これらは単独、又は、併用して使用することが
できる。Further, as the carbon fiber used in the present invention, commercially available carbon fibers are used. Commercially available products include carbon fibers made by making polyacrylonitrile or pitch into fibers, making them flame-resistant or infusible, and then firing them, or by thermally decomposing hydrocarbon gas and growing them into fibers by vapor phase growth. These carbon fibers can be used alone or in combination.

本発明の樹脂組成物はこれら樹脂、ＯＢ及び炭素繊維を
生成分とし、湿式法により予め混合した。いわゆる、カ
ーボンマスターバッチ化シたものである。The resin composition of the present invention contains these resins, OB, and carbon fiber as components, and is mixed in advance by a wet method. This is what is called a carbon masterbatch.

まず、ＯＢと炭素繊維を共にあるいは個別に水に分解さ
せた分散液を調裂するが、かかる分散液はＯＢと炭素繊
維をそれぞれにあるいはＣＢと炭素繊維を共に水に分散
きせ、剪断攪拌して調製する。その際、ａＢ＠と炭素繊
維謔の合計が使用する水の１に対し／夕ｗｔ％以下の範
囲となるようにする。First, a dispersion liquid in which OB and carbon fibers are decomposed together or individually in water is prepared, and the dispersion liquid is prepared by dispersing OB and carbon fibers individually or together with CB and carbon fibers in water, and then shearing and stirring. Prepare. At that time, the total of aB@ and carbon fiber weight should be within the range of 1/wt% of the water used.

また必要に応じて脂肪酸石けん等の分散剤等を添加して
もよく、その場合添加する分散剤の量はＯＢあるいは炭
素繊維が水に均一に分散される程度であれば特に限定さ
れるものではない。Further, a dispersant such as fatty acid soap may be added as necessary, and in that case, the amount of the dispersant added is not particularly limited as long as the OB or carbon fibers are uniformly dispersed in the water. do not have.

なお、以下の説明においてかかる分散液をＯＲ／炭素繊
維水スラリーと略記することがある。In addition, in the following description, such a dispersion liquid may be abbreviated as OR/carbon fiber water slurry.

次いで、樹脂溶液あるいは樹脂分散液とＯＲ／炭素繊維
水スラリーとを混合、攪拌するが、その際得られる樹脂
組成物中の炭素繊維がなるべく切断されないよう攪拌す
る。Next, the resin solution or resin dispersion and the OR/carbon fiber water slurry are mixed and stirred, and the stirring is done so that the carbon fibers in the resulting resin composition are not cut as much as possible.

混入する炭素繊維の長さは３００μ以上であることが好
ましい。It is preferable that the length of the carbon fibers to be mixed is 300μ or more.

樹脂溶液あるいは樹脂分散液としては、前述し次樹脂を
水あるいは有機溶媒に溶解あるいは分散させたものであ
って、固形分として／θｖｔ％以上のものが用いられる
。The resin solution or resin dispersion is one in which the following resin is dissolved or dispersed in water or an organic solvent, and has a solid content of /θvt% or more.

また、有機溶媒としては疎水性溶媒であって、具体的に
はへキサン、ヘプタン、ペンタン、トルエン、キシレン
等が用いラレル。The organic solvent used is a hydrophobic solvent, specifically hexane, heptane, pentane, toluene, xylene, etc.

○Ｂ／炭素繊維水スラリーと樹脂溶液あるいは樹脂分散
液とを混合攪拌すると、　４ｔＪ脂相と水相のコ相が形
成される。ＯＢと炭素繊維は初め主に水相中に存在する
が、さらに攪拌を続けると、水相中のＯＢと炭素繊維は
樹脂相に移行する。ＯＢと炭素繊維を樹脂相に移行させ
たのち。○B/When the carbon fiber water slurry and the resin solution or resin dispersion are mixed and stirred, a co-phase of 4tJ fat phase and water phase is formed. Initially, the OB and carbon fibers mainly exist in the aqueous phase, but as the stirring is continued, the OB and carbon fibers in the aqueous phase transition to the resin phase. After the OB and carbon fibers are transferred to the resin phase.

混合系から液体成分、すなわち、水あるいは水と有機溶
媒を除去することにより、ＯＢ、炭素繊維及び熱可塑性
樹脂を生成分とする樹脂組成物が得られるが、必要に応
じ、酸又はその他の凝固剤により凝固、所望により、脱
水、乾燥してもよい。By removing the liquid component, that is, water or water and the organic solvent, from the mixed system, a resin composition containing OB, carbon fiber, and thermoplastic resin can be obtained. It may be coagulated with an agent and, if desired, dehydrated and dried.

ＯＢ／炭素繊維水スラリーと樹脂溶液あるいは樹脂分散
液との混合順序は特に限定されるものではなく、ＯＢ、
炭素繊維を、共に水で分散した後、樹脂溶液、又は樹脂
分散液中に混合しても良いし、ＯＢ／水スラリーを樹脂
溶液又は樹脂分散液に混合し念後、炭素繊維／水スラリ
ーを混合しても良い。又、その逆にしても良い。The order of mixing the OB/carbon fiber water slurry and the resin solution or resin dispersion is not particularly limited;
The carbon fibers may be dispersed in water and then mixed into the resin solution or resin dispersion, or the OB/water slurry may be mixed into the resin solution or resin dispersion, and then the carbon fiber/water slurry may be mixed into the resin solution or resin dispersion. May be mixed. Alternatively, the reverse may be used.

また、本発明の樹脂組成物に配合される炭素繊維の配合
割合は樹脂１０θ重量部に対し／〜・１００重量部、好
ましくは、１〜６０重量部、さらに好ましくは、！〜４
ｔｏ重量部である。Further, the blending ratio of carbon fibers to be blended into the resin composition of the present invention is /~·100 parts by weight, preferably 1 to 60 parts by weight, and more preferably ! to 10θ parts by weight of the resin. ~4
to parts by weight.

７重量部未満では１組成物の機械的強度向上を図ること
が困難であり、１００重量部を越えると炭素繊維が凝集
し１分散性が悪くなるのでｔＥましくない。If it is less than 7 parts by weight, it is difficult to improve the mechanical strength of the composition, and if it exceeds 100 parts by weight, the carbon fibers will aggregate and the dispersibility will deteriorate, resulting in poor tE.

また、ＯＢの配合割合は樹脂１００重量部に対し３０〜
１００重量部とするのがよい。In addition, the blending ratio of OB is 30 to 100 parts by weight of resin.
The amount is preferably 100 parts by weight.

更に、上記方法によって得られた樹脂組成物に押出、成
形等の加工性を良好とするために軟化剤を配合すること
が好ましい。配合する軟化剤としては通常合成ゴム等を
製造する際に用いられる軟化剤であれば特に限定される
ものではなく１例えばプロセス油、アミマチイック油。Furthermore, it is preferable to add a softener to the resin composition obtained by the above method in order to improve processability in extrusion, molding, etc. The softener to be blended is not particularly limited as long as it is a softener normally used in the production of synthetic rubber, etc. For example, process oil, amimetic oil.

ジオクチルフタレート等を用いるのがよい。It is preferable to use dioctyl phthalate or the like.

軟化剤の配合量としては、樹脂組成物に付与する加工性
、柔軟性の相変により決定ちれるが。The amount of the softener to be blended is determined depending on the processability and flexibility imparted to the resin composition.

通常樹脂１００重量部に対し７０重量部以下、好ましく
は１０重量部以下とするのがよい。Usually, the amount is preferably 70 parts by weight or less, preferably 10 parts by weight or less, per 100 parts by weight of the resin.

また、本発明の樹脂組成物に架橋助剤、架橋促進剤、老
化防止剤等の助剤を混合することができる。Further, auxiliary agents such as a crosslinking aid, a crosslinking accelerator, and an anti-aging agent can be mixed into the resin composition of the present invention.

この混合法は、バンバリーミキサ−、ロール、ニーダ−
、トランスファーミックス等で混合できる。This mixing method uses Banbury mixers, rolls, kneaders, etc.
Can be mixed with , transfer mix, etc.

その際、長時間の混合を行なうと、炭素繊維が切断感れ
るので、例えば、バンバリーミキサ−であれば／分程度
で混合を行なうのが好ましい。At this time, if the carbon fibers are mixed for a long time, the carbon fibers may feel cut, so it is preferable to mix at a speed of about 1 minute using a Banbury mixer, for example.

又、場合によっては、本発明の樹脂組成物を上記助剤と
ブレンド混合後、押出し、射出成型等で成型加工するこ
ともできる。Further, depending on the case, the resin composition of the present invention may be blended with the above-mentioned auxiliary agent and then molded by extrusion, injection molding, or the like.

（効　果） かくして得られる、本発明の導電性樹脂組成物は、ＯＢ
及び炭素繊維の飛散がなく、短い混線時間でＯＢ及び炭
素繊維を均一分散させることができる。特に、本発明の
樹脂組成物は樹脂に直接ＯＢ及び炭素繊維を配合、混練
する。いわゆるドライミックス法に比べ、同−ＯＢ、同
−炭素繊維含有量で、より高い導電性を付与することが
できる。(Effect) The conductive resin composition of the present invention obtained in this way has OB
Also, there is no scattering of carbon fibers, and the OB and carbon fibers can be uniformly dispersed in a short crosstalk time. In particular, in the resin composition of the present invention, OB and carbon fiber are directly blended and kneaded with the resin. Compared to the so-called dry mix method, higher conductivity can be imparted with the same -OB and carbon fiber contents.

これは、ドライミックス法で得られる樹脂組成物は、Ｏ
Ｂの分散度を向上させるため、長時間の混線を必要とす
る。そのため、混線中に炭素線維が切断されてしまうが
、本発明によって得られる樹脂組成物はＯＢ分散が容易
なため。This means that the resin composition obtained by the dry mix method is
In order to improve the degree of dispersion of B, long-time crosstalk is required. Therefore, the carbon fibers are cut during crosstalk, but the resin composition obtained by the present invention can be easily dispersed in OB.

短時間で混線が可能であることから、炭素繊維の切断が
少なく、ドライミックス法に比較し。Because crosstalk can occur in a short time, there is less cutting of carbon fibers compared to the dry mix method.

炭素繊維の長さは釣λ倍の長さを示し、導電性が良好と
なるためであると推測される。This is presumed to be due to the fact that the length of the carbon fiber is λ times the length, and the conductivity is good.

更に本発明の樹脂組成物はドライミックス法により得ら
れるものと比較してより良好な押出し特性を有するもの
である。Furthermore, the resin composition of the present invention has better extrusion properties than those obtained by the dry mix method.

以下、本発明を実施例によりさらに詳細に説明するが、
本発明は、その要旨を越えない限り、実施例に限定され
るものではない。Hereinafter, the present invention will be explained in more detail with reference to Examples.
The present invention is not limited to the examples unless it goes beyond the gist thereof.

実施例／ スチレン−ブタジェン共重合体ラテックス（固形分１１
０重量％）を水で希釈し、ゴム含有ｉｊｔ童チのゴムラ
テックス分散液を調製した。Example/Styrene-butadiene copolymer latex (solid content 11
(0% by weight) was diluted with water to prepare a rubber-containing rubber latex dispersion.

次いで、このゴム分散液にＯＢ　（Ｄ工ＡＢＬＡＯＫ＃
３！θθＢ三菱化成工業■商標）！θ重量部と３１ｍの
長さのＰＡＮ系炭素炭素繊維重量部と水を混合攪拌しな
がら、硫酸を添加し、ＯＢと炭素繊維とゴムが結合した
羽毛状塊を作成させた。Next, OB (D Engineering ABLAOK#) was added to this rubber dispersion.
3! θθB Mitsubishi Chemical Industries ■Trademark)! Part by weight of θ, part by weight of PAN-based carbon fibers having a length of 31 m, and water were mixed and stirred while sulfuric acid was added to create a feather-like mass in which OB, carbon fiber, and rubber were combined.

この後、羽毛状塊を脱水、乾燥し、カーボンマスターバ
ッチ（以下ＯＢＭＢ−／と記す）を得た。Thereafter, the feather-like mass was dehydrated and dried to obtain a carbon masterbatch (hereinafter referred to as OBMB-/).

このＯＢＭＢ−／に、酸化亜鉛二！を置部、ステアリン
酸：／重盪部、イオウニー２重量部、７ＪＯ硫促進剤Ｎ
０Ｂ８　：　／１を置部ｔ″添加し、バンバリーミキサ
−で混練後、ロールで成型し、プレス力ｎ硫を行った。Zinc oxide on this OBMB-/! Part, stearic acid:/part by weight, 2 parts by weight of sulfur, 7JO sulfur accelerator N
0B8:/1 was added in an amount of t'', and after kneading with a Banbury mixer, it was molded with a roll and subjected to pressing force n sulfur.

実施例コ 炭素繊維を４ｔｏｘｍ部とする以外は実施例／と同様に
行ない、カーボンマスターバッチ（以下ＯＢＭＢ−λと
記す）を得九。Example 1 A carbon masterbatch (hereinafter referred to as OBMB-λ) was obtained in the same manner as in Example 1, except that 4 toxm parts of carbon fiber was used.

とのＯＢＭＢ−λに実施例／と同様に、架橋剤等を添加
し混線、成型、加硫を行なつ走。A cross-linking agent, etc. was added to OBMB-λ, and crosslinking, molding, and vulcanization were performed in the same manner as in Example.

実施例３ 実施例／と同様な方法でゴム分散液とＯＢ夕ａｗｉｔ部
と炭素繊維−０重量を含む均一懸濁液を作成し虎。Example 3 A homogeneous suspension containing a rubber dispersion, an OB fiber, and a carbon fiber was prepared in the same manner as in Example.

次いで、アロマティックオイル２０重量部と該オイル１
００重量部に対し２重量部の石鹸を混合攪拌して得られ
た液を、上記ゴム分散液と均一懸濁液に混合、攪拌しな
がら凝固剤を添加し該オイルとＯＢと炭素繊維とゴム結
合した羽毛状塊を作成し九。Next, 20 parts by weight of aromatic oil and 1 part of the oil
A liquid obtained by mixing and stirring 2 parts by weight of soap per 00 parts by weight is mixed with the above rubber dispersion and a uniform suspension, and a coagulant is added while stirring to form the oil, OB, carbon fiber, and rubber. Create a combined feathery mass.9.

この後１羽毛状塊を脱水、乾燥し刀−ボンマスターパッ
チ（以下ＯＢＭＢ−Ｊと記す）を得念。After this, one feather-like mass was dehydrated and dried to form a sword-bon master patch (hereinafter referred to as OBMB-J).

このＯＢＭＢ−、？に、実施例−／と同様に、架橋剤等
′ｆ：添加し、混線、成型、刀口硫を行った。This OBMB-? In the same manner as in Example-/, a crosslinking agent, etc.'f: was added, and cross-linking, molding, and sulfurization were performed.

実施例グ 炭素繊維をダθ重量部、アロマティックオイルをダＯ重
量部とする以外は実施例３と同様に行い、カーボンマス
ターバッチ（以下ＯＢＭＢ−ｘ）を得な。Example 4 A carbon masterbatch (hereinafter referred to as OBMB-x) was obtained in the same manner as in Example 3, except that the carbon fiber was used in parts by weight of Daθ and the aromatic oil was used in parts by weight of DaO.

とのＯＢＭＢ−（’に実施例／と同様に、架橋剤等を添
加し混線、成型、加硫を行った。In the same manner as in Example/, cross-linking, molding, and vulcanization were performed by adding a crosslinking agent and the like to OBMB-('.

比較例／ 実施例／と同様な方法でゴム分散液を調製した。Comparative example/ A rubber dispersion was prepared in the same manner as in Example.

次いで、０Ｂ（Ｄ工ＡＢＬＡＣＫ＄ＪｊθＯＢ　　三菱
化成工業■商標）１０重量部と水を混合攪拌して作った
１重Ｍ％のＯＢを含む均一懸濁液を上記ゴム分散液に混
合攪拌し、更に、凝固剤として硫Ｅ１２を添加して、Ｏ
Ｂとゴムが結合した羽毛状塊を生成させた。この後、こ
の羽毛状塊を脱水、乾燥シ、カーボンマスターバッチ（
以下ＯＢＭＢ−ｊと記す）を得た。Next, a homogeneous suspension containing 1% by weight of OB, prepared by mixing and stirring 10 parts by weight of 0B (D Engineering ABLACK $ JjθOB Mitsubishi Chemical Industries ■ Trademark) and water, was mixed and stirred into the rubber dispersion, and further , with the addition of sulfur E12 as a coagulant, O
A feather-like mass in which B and rubber were combined was produced. After this, this feather-like mass is dehydrated, dried, and carbon masterbatch (
(hereinafter referred to as OBMB-j) was obtained.

とのＯＢＭＢ−ＪＦに実施例／と同様に架橋剤等を添加
し、混線、成型、加硫を行った。A crosslinking agent and the like were added to OBMB-JF in the same manner as in Example, and cross-crossing, molding, and vulcanization were performed.

比較例−２〜７ 比較例−〜７は、スチレン−ブタジェン共重合体ゴム１
００重量部、ＯＢ　ｊθ重世部（炭素繊維：θ〜グθ重
童部、アロマティックオイル：０〜．２０重量部）と比
較例／と同様の架橋剤等を添加し、バンバ＋７　　＜キ
サ−で混合する、いわゆる、ドライミックス法により混
合し、その後成型、加硫を行つ喪。Comparative Examples 2 to 7 Comparative Examples 2 to 7 are styrene-butadiene copolymer rubber 1
00 parts by weight, OB jθ heavy part (carbon fiber: θ~gθ heavy part, aromatic oil: 0~.20 parts by weight) and the same crosslinking agent as in Comparative Example/, and Bamba+7<Kisa - Mixing by the so-called dry mix method, followed by molding and vulcanization.

上記の各ゴム組成物についての物性を第１表に示すが、
この表における各項目の測定は次の方法によった。The physical properties of each of the above rubber compositions are shown in Table 1.
Each item in this table was measured by the following method.

消費電力は、ラボ　プラストミル（東洋精機社商標）に
よる消費電力比を示した。The power consumption shows the power consumption ratio by Labo Plastomill (trademark of Toyo Seiki Co., Ltd.).

体積固有抵抗は、デジタル　マルチメーター（タケダ理
研株式会社商標）を用いて、２ｊ℃湿度≦０％の雰囲気
で試験片の抵抗値を測定しこれより、下記式によって算
出した。The volume resistivity was calculated by measuring the resistance value of the test piece using a digital multimeter (trademark of Takeda Riken Co., Ltd.) in an atmosphere of 2J° C. and humidity ≦0%, and using the measured value according to the following formula.

８×測定し九試験片の抵抗値 体積固有抵抗（Ω−ｃｒｎ＞＝□ θ　：上記固有抵抗率測定電極の電極面積ｔ　：試験片
の厚さ8×Resistance value of 9 test pieces Volume resistivity (Ω-crn>=□ θ: Electrode area of the above specific resistivity measuring electrode t: Thickness of test piece

Claims (2)

【特許請求の範囲】[Claims] （１）カーボンブラックと炭素繊維を共にあるいは個別
に水に分散させた分散液と、樹脂溶液あるいは樹脂分散
液とを混合する工程を経て得られる導電性樹脂組成物で
あつて、樹脂 １００重量部に対して、カーボンブラックを３０〜１０
０重量部および炭素繊維を１〜 １００重量部含有してなることを特徴とする導電性樹脂
組成物。(1) A conductive resin composition obtained through a process of mixing a dispersion in which carbon black and carbon fibers are dispersed together or individually in water, and a resin solution or a resin dispersion, which contains 100 parts by weight of resin. 30 to 10 carbon black
1. A conductive resin composition comprising 0 parts by weight of carbon fibers and 1 to 100 parts by weight of carbon fibers. （２）導電性樹脂組成物が樹脂１００重量部に対して７
０重量部以下の軟化剤を含有することを特徴とする特許
請求の範囲第１項記載の導電性樹脂組成物。(2) The conductive resin composition is 7 parts by weight based on 100 parts by weight of the resin.
2. The conductive resin composition according to claim 1, which contains 0 parts by weight or less of a softener.