JP2007077551A - Conductive fiber, raised fabric for conductive brush, conductive brush - Google Patents
Conductive fiber, raised fabric for conductive brush, conductive brush Download PDFInfo
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本発明は、複写機やプリンター等の電子写真装置に用いられる導電性ブラシ、並びにそれを構成する導電性ブラシ用起毛布及び導電性繊維に関する。 The present invention relates to a conductive brush used for an electrophotographic apparatus such as a copying machine or a printer, and a brushed cloth for a conductive brush and a conductive fiber constituting the conductive brush.
複写機あるいはプリンター等における電子写真方式の画像形成プロセスにおいては、各種の導電性を有するブラシ、すなわち導電性ブラシが使用されている。
例えば、感光体のような静電潜像担持体の表面を帯電装置で帯電させる工程においては、導電性ブラシを用いることが知られている。
また、紙等へ転写しなかったトナーが、感光体等の表面に残存するため、これを除去するためにも導電性ブラシが使用されている。
このように、導電性ブラシは電子写真方式の画像形成プロセスにおいて使用されているが、多くの枚数を印刷すると、次第に導電性ブラシを構成する導電性繊維（パイル糸）にトナーや紙粉が付着して、導電性ブラシの体積固有抵抗値が部分的に変化して画像に乱れを生じさせたり、導電性繊維に付着したトナーの凝集体が脱落して印刷面を汚染する等の問題がある。
このような問題を克服するための方法として、例えば導電性ブラシの導電性繊維にトナーと同一極性の電荷を掛ける方法等が用いられているが、機械的に接触するトナーの付着を十分に抑制することはできていない。
In an electrophotographic image forming process in a copying machine or a printer, various conductive brushes, that is, conductive brushes are used.
For example, it is known to use a conductive brush in a process of charging the surface of an electrostatic latent image carrier such as a photoreceptor with a charging device.
Further, since the toner that has not been transferred to the paper or the like remains on the surface of the photoreceptor or the like, a conductive brush is also used to remove the toner.
In this way, conductive brushes are used in electrophotographic image forming processes, but when many sheets are printed, toner and paper dust gradually adhere to the conductive fibers (pile yarn) that make up the conductive brush. As a result, the volume specific resistance value of the conductive brush partially changes to cause the image to be distorted, or the toner aggregates attached to the conductive fibers fall off and contaminate the printing surface. .
As a method for overcoming such a problem, for example, a method of applying a charge having the same polarity as that of the toner to the conductive fiber of the conductive brush is used. However, adhesion of the mechanically contacting toner is sufficiently suppressed. I can't do it.
そこで、導電性ブラシを構成する導電性繊維の材質について幾つかの検討がなされている。特許文献１では、カーボンブラック等の導電性微粒子を混合したポリアミド等の熱可塑性重合体からなる導電性成分と、ポリアミド等の繊維形成性の熱可塑性重合体からなる非導電性成分とが接合されてなる複合繊維において、導電性成分が非導電性成分を完全に包み込むような芯鞘型の複合構造を有する導電性複合繊維を開示している。また、特許文献２では、２０℃、ＲＨ６５％での平衡吸湿率が０．６〜１．５％の脂肪族ポリアミド樹脂に導電性カーボンブラックが混合分散されてなる半導電性脂肪族ポリアミド繊維の有する体積抵抗率が、３５℃、ＲＨ８０％環境下で１．０桁以下にあることを特徴とする半導電性脂肪族ポリアミド繊維が開示されている。しかしながら、それらの繊維から構成される導電性ブラシにおいても、プリンター等で多くの枚数を印刷した場合におけるトナー付着の問題は解消していない。 Therefore, some studies have been made on the material of the conductive fibers constituting the conductive brush. In Patent Document 1, a conductive component made of a thermoplastic polymer such as polyamide mixed with conductive fine particles such as carbon black and a non-conductive component made of a fiber-forming thermoplastic polymer such as polyamide are joined. In this composite fiber, a conductive composite fiber having a core-sheath type composite structure in which the conductive component completely wraps the non-conductive component is disclosed. Patent Document 2 discloses a semiconductive aliphatic polyamide fiber in which conductive carbon black is mixed and dispersed in an aliphatic polyamide resin having an equilibrium moisture absorption of 0.6 to 1.5% at 20 ° C. and RH 65%. A semiconductive aliphatic polyamide fiber having a volume resistivity of 1.0 digit or less in an environment of 35 ° C. and RH 80% is disclosed. However, even in the conductive brush composed of these fibers, the problem of toner adhesion when a large number of sheets are printed by a printer or the like has not been solved.
本発明の目的は、プリンター等の帯電ブラシなどに用いた場合に、多数枚印刷時にもトナーの付着量が少なく、また抵抗値変化の小さい導電性ブラシ、並びにそれを構成する導電性起毛布及び導電性繊維を提供することにある。 An object of the present invention is to provide a conductive brush having a small amount of toner adhesion and a small resistance change even when printing on a large number of sheets when used for a charging brush of a printer or the like, and a conductive brushed cloth constituting the conductive brush and It is to provide a conductive fiber.
本発明者は、前記目的を達成するため、導電性繊維表面の汚染や印刷画質と、導電性繊維の材質との関係に着目して鋭意研究を進めた結果、導電性物質を含有したポリアミド樹脂繊維に、特定量のフッ素化合物を被覆させた導電性繊維を用いれば、それを有する導電性ブラシは、プリンター等の帯電ブラシなどに用いた場合に、多数枚印刷時に生じるトナーの付着や抵抗値変化等の問題が著しく改善できることを見出し、この知見に基づいて本発明を完成するに至った。 In order to achieve the above object, the present inventor has conducted extensive research focusing on the relationship between the conductive fiber surface contamination and print image quality, and the conductive fiber material, and as a result, has obtained a polyamide resin containing a conductive substance. If conductive fibers coated with a specific amount of fluorine compound are used for the fibers, the conductive brushes with them will have toner adhesion and resistance values when printing many sheets when used for charging brushes such as printers. It has been found that problems such as changes can be remarkably improved, and the present invention has been completed based on this finding.
かくして、本発明によれば、
１．導電性物質（Ａ）を含有する太さ１〜５０デシテックス（ｄＴｅｘ）のポリアミド樹脂繊維（Ｂ）の表面に、フッ素化合物（Ｃ）を、前記ポリアミド樹脂繊維（Ｂ）の、太さ５デシテックス（ｄＴｅｘ）当たり、且つ長さ１００００ｍ（１万メートル）当たり、０．０１〜１ｇ被覆させてなる導電性繊維；
２．導電性物質（Ａ）の含有量がポリアミド樹脂繊維（Ｂ）１００重量部に対し１０〜４０重量部である、１に記載の導電性繊維；
３．導電性物質（Ａ）がカーボンブラックである、１又は２に記載の導電性繊維；
４．前記フッ素化合物（Ｃ）が、主鎖の炭素数が６〜５０の有機フッ素樹脂である、１に記載の導電性繊維；
５．体積固有抵抗値が１０３〜１０１０Ωｃｍである、１〜４のいずれかに記載の導電性繊維；
６．基布に１〜５のいずれかに記載の導電性繊維を起立してなる、導電性ブラシ用起毛布；
７．６記載の導電性ブラシ用起毛布を有してなる、電子写真装置用導電性ブラシ；
が提供される。
Thus, according to the present invention,
1. On the surface of the polyamide resin fiber (B) having a thickness of 1 to 50 dtex (dTex) containing the conductive substance (A), the fluorine compound (C) is added to the polyamide resin fiber (B) having a thickness of 5 dtex ( dTex) and a conductive fiber coated with 0.01 to 1 g per 10,000 m (10,000 meters) in length;
2. The conductive fiber according to 1, wherein the content of the conductive substance (A) is 10 to 40 parts by weight with respect to 100 parts by weight of the polyamide resin fiber (B);
3. The conductive fiber according to 1 or 2, wherein the conductive substance (A) is carbon black;
4). The conductive fiber according to 1, wherein the fluorine compound (C) is an organic fluororesin having 6 to 50 carbon atoms in the main chain;
5. Conductive fiber in any one of 1-4 whose volume resistivity is 10 < 3 > -10 < 10 >ohm-cm;
6). Raised cloth for conductive brushes, wherein the conductive fibers according to any one of 1 to 5 are erected on a base cloth;
A conductive brush for an electrophotographic apparatus, comprising the brushed cloth for a conductive brush according to 7.6;
Is provided.
本発明の導電性繊維を基布に起立させた導電性起毛布を有してなる導電性ブラシをプリンター等の帯電ブラシとして用いると、多数枚印刷時にもトナーの付着量が少なく、また導電性ブラシの抵抗値変化が小さい。 When a conductive brush having a conductive raised fabric in which the conductive fiber of the present invention is erected on a base fabric is used as a charging brush for a printer or the like, the amount of toner attached is small even when printing a large number of sheets, and the conductive The resistance change of the brush is small.
本発明の導電性繊維は、導電性物質（Ａ）を含有する太さ１〜５０デシテックス（ｄＴｅｘ）のポリアミド樹脂繊維（Ｂ）の表面に、フッ素化合物（Ｃ）を、前記ポリアミド樹脂繊維（Ｂ）の、太さ５デシテックス（ｄＴｅｘ）当たり、且つ長さ１００００ｍ（１万メートル）当たり、０．０１〜１ｇ被覆させてなることを特徴とする。 The conductive fiber of the present invention comprises a fluorine compound (C) on the surface of a polyamide resin fiber (B) having a thickness of 1 to 50 dtex (dTex) containing the conductive substance (A), and the polyamide resin fiber (B ) Of 0.01 to 1 g per 5 decitex (dTex) and 10000 m (10,000 meters) in length.
本発明の導電性繊維に用いる導電性物質（Ａ）は、無機導電性フィラーと有機導電性フィラーとに大別される。無機導電性フィラーとしては、鉄、コバルト、ニッケル、アルミニウムなどの金属紛；酸化チタン、酸化亜鉛、酸化鉄、酸化タングステンなどの金属酸化物；鱗片状グラファイトカーボン、カーボンブラック、炭素繊維、フラーレン、カーボンナノチューブなどの炭素質フィラー；などが挙げられる。また、有機導電性フィラーとしては、ポリアニリン、ポリピロールなどの導電性高分子；鉄フタロシアニン、フェロセンなどに代表される有機金属錯体；などが挙げられる。その中でも鱗片状グラファイトカーボン、カーボンブラックが好ましく、カーボンブラックがより好ましい。これらは１種類を単独で、又は２種以上を組み合わせて用いることができる。 The electroconductive substance (A) used for the electroconductive fiber of this invention is divided roughly into an inorganic electroconductive filler and an organic electroconductive filler. Inorganic conductive fillers include metal powders such as iron, cobalt, nickel, and aluminum; metal oxides such as titanium oxide, zinc oxide, iron oxide, and tungsten oxide; scaly graphite carbon, carbon black, carbon fiber, fullerene, carbon And carbonaceous fillers such as nanotubes. Examples of the organic conductive filler include conductive polymers such as polyaniline and polypyrrole; organometallic complexes represented by iron phthalocyanine, ferrocene, and the like. Among these, scaly graphite carbon and carbon black are preferable, and carbon black is more preferable. These can be used alone or in combination of two or more.
前記カーボンブラックのさらに好ましいものの具体例としては、アセチレンブラック；ケッチェンブラック；チャンネルブラック；ファーネスブラック；酸化カーボン等の変性カーボン；などが挙げられる。この中でもアセチレンブラックが、ストラクチャーが発達し少量の配合量で所望の半導電性が得られる点で特に好ましい。 Specific examples of the more preferable carbon black include acetylene black; Ketjen black; channel black; furnace black; modified carbon such as oxidized carbon; Among these, acetylene black is particularly preferable in that the structure develops and a desired semiconductivity can be obtained with a small amount.
カーボンブラックの一次平均粒子径については特に制限はないが、好ましくは１０〜８０ｎｍの範囲である。 Although there is no restriction | limiting in particular about the primary average particle diameter of carbon black, Preferably it is the range of 10-80 nm.
前記導電性物質（Ａ）の、ポリアミド樹脂繊維（Ｂ）１００重量部に対する含有量は、１０〜４０重量部が好ましく、２０〜３０重量部がより好ましい。添加量が前記範囲内にあることにより、導電性繊維の体積固有抵抗値が適正となり導電性繊維にトナーが付着するのを防止でき、また、該導電性繊維を用いてなる帯電ブラシ（導電性ブラシ）が帯電機能を十分発揮することができる。 The content of the conductive substance (A) with respect to 100 parts by weight of the polyamide resin fiber (B) is preferably 10 to 40 parts by weight, and more preferably 20 to 30 parts by weight. When the addition amount is within the above range, the volume specific resistance value of the conductive fiber becomes appropriate, and toner can be prevented from adhering to the conductive fiber. Also, a charging brush (conductivity) using the conductive fiber can be prevented. Brush) can sufficiently exhibit the charging function.
本発明の導電性繊維に用いるポリアミド樹脂繊維（Ｂ）はポリアミド樹脂を繊維状にしたものであり、その太さは、通常、１〜５０デシテックス（以下、ｄＴｅｘと記載することがある。）、好ましくは１〜３０ｄＴｅｘ、より好ましくは３〜２０ｄＴｅｘの範囲である。
ポリアミド樹脂としては、主鎖にアミド結合（−ＣＯ−ＮＨ−）を有する重合体であれば特に限定されない。例としては、４，６−ナイロン、６−ナイロン、６，６−ナイロン、６，１０−ナイロン、６，１２−ナイロン、１１−ナイロン、１２−ナイロン等の脂肪族ポリアミド；ナイロンＭＸＤ６（商品名「ＭＸナイロン」：三菱ガス化学（株）社製）、商品名「アーレン」（三井化学（株）社製）等の芳香族ポリアミド；等が挙げられる。好ましいものとしては、６−ナイロン、６，６−ナイロン、６，１２−ナイロン、１２−ナイロンが挙げられる。これらの中でも吸水による寸法変化、物性変化が小さく、耐屈曲性に優れる点で６−ナイロン、１２−ナイロンがより好ましい。これらは１種類を単独で、又は２種類以上を組み合わせて用いることができる。
The polyamide resin fiber (B) used for the conductive fiber of the present invention is obtained by forming a polyamide resin into a fiber shape, and the thickness thereof is usually 1 to 50 dtex (hereinafter sometimes referred to as dTex), Preferably it is 1-30 dTex, More preferably, it is the range of 3-20 dTex.
The polyamide resin is not particularly limited as long as it is a polymer having an amide bond (—CO—NH—) in the main chain. Examples include aliphatic polyamides such as 4,6-nylon, 6-nylon, 6,6-nylon, 6,10-nylon, 6,12-nylon, 11-nylon, 12-nylon; nylon MXD6 (trade name) "MX nylon": manufactured by Mitsubishi Gas Chemical Co., Ltd.) and aromatic polyamides such as trade name "Aalen" (manufactured by Mitsui Chemicals, Inc.). Preferable examples include 6-nylon, 6,6-nylon, 6,12-nylon, and 12-nylon. Among these, 6-nylon and 12-nylon are more preferable in that they are small in dimensional change and physical property change due to water absorption and are excellent in bending resistance. These can be used alone or in combination of two or more.
本発明の導電性繊維に用いるフッ素化合物（Ｃ）は、フッ素を含有する化合物であれば特に限定されない。例としては、ポリテトラフルオロエチレン、テトラフルオロエチレン−ヘキサフルオロプロピレン共重合体、テトラフルオロエチレン−パーフルオロプロピルビニルエーテル共重合体、エチレン−テトラフルオロエチレン共重合体、ポリビニリデンフルオライドなどの有機フッ素樹脂が挙げられる。これらは１種類を単独で、又は２種以上を組み合わせて用いることができる。なかでも、主鎖の炭素数が６〜５０である有機フッ素樹脂が好ましく、主鎖の炭素数が８〜３０である有機フッ素樹脂がより好ましく、主鎖の炭素数が１２〜２０である有機フッ素樹脂が更に好ましい。 The fluorine compound (C) used for the conductive fiber of the present invention is not particularly limited as long as it is a fluorine-containing compound. Examples include organic fluororesins such as polytetrafluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoropropyl vinyl ether copolymer, ethylene-tetrafluoroethylene copolymer, and polyvinylidene fluoride. Is mentioned. These can be used alone or in combination of two or more. Among them, an organic fluororesin having 6 to 50 carbon atoms in the main chain is preferable, an organic fluororesin having 8 to 30 carbon atoms in the main chain is more preferable, and an organic organic resin having 12 to 20 carbon atoms in the main chain. A fluororesin is more preferable.
前記フッ素化合物（Ｃ）の前記ポリアミド樹脂繊維（Ｂ）に対する被覆量は、前記ポリアミド樹脂繊維（Ｂ）の、太さ５デシテックス（ｄＴｅｘ）当たり、且つ長さ１００００ｍ（１万メートル）当たり、通常、０．０１〜１ｇ、好ましくは０．０１〜０．８ｇ、より好ましくは０．０３〜０．６ｇである。被覆量が上記範囲よりも少なすぎると導電性繊維にトナーが付着しやすくなり、一方、上記範囲よりも多すぎるとポリアミド樹脂繊維（Ｂ）からフッ素化合物（Ｃ）剥離しやすくなり、いずれの場合も好ましくない。 The coating amount of the fluorine compound (C) on the polyamide resin fiber (B) is usually about 5 decitex (dTex) and about 10,000 m (10,000 meters) in length of the polyamide resin fiber (B). 0.01 to 1 g, preferably 0.01 to 0.8 g, more preferably 0.03 to 0.6 g. If the coating amount is less than the above range, the toner tends to adhere to the conductive fiber. On the other hand, if it is more than the above range, the fluorine compound (C) is easily peeled from the polyamide resin fiber (B). Is also not preferred.
本発明の導電性繊維の体積固有抵抗値は、１０３〜１０１０Ωｃｍが好ましく、１０５〜１０８Ωｃｍがより好ましい。体積固有抵抗値がこの範囲内にあることにより、前記導電性繊維へのトナーの付着が抑えられ、また前記導電性繊維を用いてなる帯電ブラシが帯電機能を十分発揮することができる。 The volume resistivity value of the conductive fiber of the present invention is preferably 10 3 to 10 10 Ωcm, and more preferably 10 5 to 10 8 Ωcm. When the volume specific resistance value is within this range, toner adhesion to the conductive fibers can be suppressed, and the charging brush using the conductive fibers can sufficiently exhibit the charging function.
本発明の導電性繊維の太さは、通常、１〜５０デシテックス（ｄＴｅｘ）、好ましくは１〜３０ｄＴｅｘ、より好ましくは３〜２０ｄＴｅｘである。前記導電性繊維の太さがこの範囲内にあることにより、導電性繊維の切断が起こりにくく、かつ適度な柔軟性を有することで帯電ドラム等を傷つけない導電性ブラシを構成することができる。 The thickness of the conductive fiber of the present invention is usually 1 to 50 dtex (dTex), preferably 1 to 30 dTex, more preferably 3 to 20 dTex. When the thickness of the conductive fiber is within this range, it is possible to form a conductive brush that does not easily cut the conductive fiber and that does not damage the charging drum or the like by having an appropriate flexibility.
本発明の導電性繊維には、所望により、酸化防止剤、紫外線吸収剤、紫外線安定剤、架橋反応抑制剤、可塑剤、分散剤、非導電性充填剤などの公知の各種添加剤を、本発明の効果を損なわない程度に配合することができる。 If desired, the conductive fiber of the present invention may contain various known additives such as an antioxidant, an ultraviolet absorber, an ultraviolet stabilizer, a crosslinking reaction inhibitor, a plasticizer, a dispersant, and a nonconductive filler. It can mix | blend to such an extent that the effect of invention is not impaired.
本発明の導電性繊維を製造する方法は、特に限定されない。一例としては、下記の方法が挙げられる。ポリアミド樹脂、導電性物質（Ａ）及び各種添加剤を、ヘンシェルミキサーやタンブラー等の混合機を用いて混合し、それをペレット用押出機に供給して溶融混練した後に線状に押出し、３〜５ｍｍ長さに切断してペレットを得る。このペレットを、溶融紡糸機に供給し、所定の太さの繊維に加工することによりポリアミド樹脂繊維（Ｂ）とする。このポリアミド樹脂繊維（Ｂ）を、四塩化炭素などのハロゲン溶媒にフッ素化合物（Ｃ）を所定濃度で溶解したものの中に通した後、余分な溶液を除去し、乾燥することで、本発明の導電性繊維を好適に製造することができる。 The method for producing the conductive fiber of the present invention is not particularly limited. The following method is mentioned as an example. The polyamide resin, the conductive material (A) and various additives are mixed using a mixer such as a Henschel mixer or a tumbler, supplied to a pellet extruder, melt-kneaded, and extruded into a linear shape. Cut to 5 mm length to obtain pellets. The pellets are supplied to a melt spinning machine and processed into fibers of a predetermined thickness to obtain polyamide resin fibers (B). The polyamide resin fiber (B) is passed through a solution obtained by dissolving the fluorine compound (C) at a predetermined concentration in a halogen solvent such as carbon tetrachloride, and then the excess solution is removed and dried. Conductive fibers can be suitably produced.
本発明の導電性ブラシ用起毛布は、基布に前記導電性繊維を起立してなる。 The raised fabric for conductive brushes of the present invention is formed by raising the conductive fibers on a base fabric.
前記基布は特に限定されず、導電性のものでも、非導電性のものでも良い。その中においても、ポリエステル等の繊維を綾織してなるものが、柔軟性を有する点や、導電性繊維を起立しやすい点などにおいて優れているため好ましい。 The base fabric is not particularly limited, and may be conductive or non-conductive. Among them, those obtained by twilling a fiber such as polyester are preferable because they are excellent in flexibility and easy to stand up conductive fibers.
前記基布に前記導電性繊維を起立する方法は、特に限定されないが、前記基布に前記導電性繊維を毛ばさみ織りすることで起立する方法が好ましい。 The method of raising the conductive fibers on the base fabric is not particularly limited, but a method of standing up by weaving the conductive fibers on the base fabric is preferred.
前記導電性ブラシ用起毛布の製造方法は特に限定されないが、前記基布に前記導電性繊維を起立した起毛布に、前記導電性繊維を起立した面と反対の面（導電性繊維の起立していない方の面）から水系導電性コーティング剤を塗布・浸透させ、その後乾燥することで好適に得ることができる。 The method for producing the conductive brush raising cloth is not particularly limited, but a surface opposite to the surface where the conductive fibers are erected on the raised cloth where the conductive fibers are erected on the base fabric (the erection of the conductive fibers). The water-based conductive coating agent can be applied and infiltrated from the other side), and then dried to obtain it suitably.
本発明の導電性ブラシは、前記導電性ブラシ用起毛布を有してなる。 The conductive brush of this invention has the said brush raising cloth for conductive brushes.
前記導電性ブラシの形状及び製造方法は、共に特に限定されない。一例として、円筒状の金属製基板の上に、前記導電性ブラシ用起毛布を、前記導電性繊維を起立した面と反対の面に導電性接着剤等を塗り、前記基板に貼り付ける事で円筒状の前記導電性ブラシを製造することができる。本発明の導電性ブラシは、電子写真装置用の帯電ブラシ等に好適に用いられる。 The shape and manufacturing method of the conductive brush are not particularly limited. As an example, on a cylindrical metal substrate, the conductive brush brushed fabric, a conductive adhesive or the like on the surface opposite to the surface on which the conductive fibers are raised, and affixed to the substrate The cylindrical conductive brush can be manufactured. The conductive brush of the present invention is suitably used for a charging brush for an electrophotographic apparatus.
〔実施例〕
以下に実施例を挙げて本発明を更に詳細に説明する。実施例中における部及び％は、特に言及がない限り、重量基準である。
〔Example〕
Hereinafter, the present invention will be described in more detail with reference to examples. Parts and percentages in the examples are by weight unless otherwise specified.
なお、本発明において、体積固有抵抗値は、測定器として、極超絶縁計ＳＭ８２１３型（東亜電波工業（株）社製）を使用して測定した。長さ７ｃｍの導電性繊維の両端１ｃｍの部分にそれぞれ導電性ペースト（ドータイト：藤倉化成（株）社製）を塗り１時間乾燥させ、その後、導電性繊維の両端部の導電性ペーストを塗った部分を測定器に接続して抵抗値を測定した。得られた抵抗値に導電性繊維の断面積を掛けて体積固有抵抗値とした。なお測定は、温度２３℃、相対湿度５５％にて行った。 In the present invention, the volume resistivity was measured using a hyperinsulation meter SM8213 type (manufactured by Toa Denpa Kogyo Co., Ltd.) as a measuring instrument. A conductive paste (Dotite: manufactured by Fujikura Kasei Co., Ltd.) was applied to each of the 1 cm ends of the 7 cm long conductive fiber and dried for 1 hour, and then the conductive paste on both ends of the conductive fiber was applied. The part was connected to a measuring instrument and the resistance value was measured. The obtained resistance value was multiplied by the cross-sectional area of the conductive fiber to obtain a volume specific resistance value. The measurement was performed at a temperature of 23 ° C. and a relative humidity of 55%.
〔導電性繊維の製造〕
ポリアミド樹脂として９８％硫酸相対粘度（９８％硫酸相対粘度とは、繊維２５ｇを９８％硫酸２５ｍｌに溶解し、オストワルド粘度計を用いて２５℃で測定した値である。）が２．６である６−ナイロン１００重量部、導電性物質（Ａ）としてカーボンブラックの１種であるアセチレンブラック（デンカブラック：電気化学工業（株）社製）２６重量部、酸化防止剤としてイルガノックスＢ１１７１（チバスペシャリティーケミカルス（株）社製）０．２重量部を、二軸同方向押出機を用いて混練し、ペレットを作製した。このペレットを、押出機を用いて溶融紡糸法により太さ６デシテックス、体積固有抵抗値１×１０６Ωｃｍのポリアミド樹脂繊維（Ｂ１）を得た。このポリアミド樹脂繊維（Ｂ１）を溶融紡糸機で紡糸直後に、溶媒であるＨＦＣ−４３−１０ｍｅｅ（商品名バートレル：三井・デュポンフロロケミカル（株）製、沸点５５℃）に、主鎖の炭素数が１２であるポリテトラフルオロエチレンを溶解させた溶液（濃度：０．２ｇ／ｍｌ）中に通し、絞り器で塗布量を調節した後、自然乾燥し、導電性繊維を製造した。この導電性繊維における、ポリアミド樹脂繊維（Ｂ１）の、太さ５デシテックス（ｄＴｅｘ）当たり、且つ長さ１００００ｍ（１万メートル）当たりのポリテトラフルオロエチレンの被覆量は、０．０３３ｇ、体積固有抵抗値は１×１０６Ωｃｍであった。
[Manufacture of conductive fibers]
The polyamide resin has a relative viscosity of 98% sulfuric acid (98% sulfuric acid relative viscosity is a value obtained by dissolving 25 g of fiber in 25 ml of 98% sulfuric acid and measuring at 25 ° C. using an Ostwald viscometer). 6-Nylon 100 parts by weight, 26 parts by weight of acetylene black (DENKA BLACK: manufactured by Denki Kagaku Kogyo Co., Ltd.) as a conductive material (A), Irganox B1171 (Ciba Specialty) 0.2 parts by weight (made by Tea Chemicals Co., Ltd.) was kneaded using a twin-screw co-directional extruder to produce pellets. From the pellets, a polyamide resin fiber (B1) having a thickness of 6 dtex and a volume resistivity of 1 × 10 6 Ωcm was obtained by melt spinning using an extruder. Immediately after spinning this polyamide resin fiber (B1) with a melt spinning machine, the solvent is HFC-43-10mee (trade name Bartlel: manufactured by Mitsui DuPont Fluorochemical Co., Ltd., boiling point 55 ° C.), the number of carbons in the main chain. Was passed through a solution (concentration: 0.2 g / ml) in which polytetrafluoroethylene having a viscosity of 12 was dissolved, and after adjusting the coating amount with a squeezer, it was naturally dried to produce conductive fibers. In this conductive fiber, the coating amount of the polytetrafluoroethylene per 5 decitex (dTex) and the length of 10,000 m (10,000 meters) of the polyamide resin fiber (B1) is 0.033 g, volume resistivity. The value was 1 × 10 6 Ωcm.
〔導電性ブラシの製造〕
前述の方法で得られた導電性繊維を用いて、太さ８０番のポリエステル繊維を綾織してなる基布に、植毛密度７０，０００本／平方インチになるように、毛ばさみ織りで織布して起立し、長さ６ｍｍの導電性繊維を有する起毛布を得た。この起毛布の導電性繊維の起立していない方の面から、ロールコーターで体積固有抵抗値が７５Ωｃｍの水系コーティング剤を、起毛布１ｍ２当たり固形分で６０ｇ塗布した。６０℃の乾燥機で８時間乾燥し、導電性ブラシ用起毛布を得た。
得られた導電性ブラシ用起毛布を用いて、外径８ｍｍの金属棒に巻き付けて外径１６ｍｍ、起毛布を巻き付けた部分の長さ２５ｃｍの導電性ブラシを得た。
[Manufacture of conductive brush]
Using the conductive fibers obtained by the above-mentioned method, a base fabric formed by twilling a polyester fiber having a thickness of 80 is used with a hair shear weave so that the flocking density is 70,000 / square inch. A raised fabric having conductive fibers having a length of 6 mm was obtained. From the surface of the raised fabric where the conductive fibers were not raised, 60 g of a water-based coating agent having a volume resistivity of 75 Ωcm was applied in a solid content per 1 m 2 of the raised fabric using a roll coater. It dried for 8 hours with the dryer of 60 degreeC, and the brushed cloth for conductive brushes was obtained.
Using the resulting brushed cloth for conductive brushes, a conductive brush having an outer diameter of 16 mm and a length of 25 cm of the portion wound with the brushed cloth was obtained by winding the metal brush with an outer diameter of 8 mm.
〔トナーとの接触試験〕
内寸幅３ｃｍ、内寸長さ２５ｃｍ、内寸高さ５ｃｍの金属製の箱に、直径３ｃｍ、長さ２５ｃｍの金属棒及び前記導電性ブラシを入れ、長さ方向にて金属棒と導電性ブラシとを接触させた。そのとき、金属棒の中心と導電性ブラシの金属軸の中心との距離は２２ｍｍであった。その状態で、導電性ブラシを１２０ｒｐｍで回転させながら、さらにトナー（平均粒子径８μｍ、ポリエステル系粉砕トナー）と接触させた。トナーは５ｇを用いた。１００枚連続印刷後の導電性ブラシへのトナー付着量を求め、１００枚目の画像の乱れ具合を観察した。結果を表１に示す。
[Contact test with toner]
Put a metal rod with a diameter of 3 cm and a length of 25 cm and the conductive brush in a metal box with an inner dimension width of 3 cm, an inner dimension length of 25 cm, and an inner dimension height of 5 cm. The brush was brought into contact. At that time, the distance between the center of the metal rod and the center of the metal axis of the conductive brush was 22 mm. In this state, the conductive brush was further brought into contact with the toner (average particle size 8 μm, polyester-based pulverized toner) while rotating the conductive brush at 120 rpm. 5 g of toner was used. The amount of toner adhering to the conductive brush after 100 sheets of continuous printing was determined, and the disorder of the 100th image was observed. The results are shown in Table 1.
導電性繊維における、ポリアミド樹脂繊維（Ｂ１）の、太さ５デシテックス（ｄＴｅｘ）当たり、且つ長さ１００００ｍ（１万メートル）当たりのポリテトラフルオロエチレンの被覆量を、０．５０ｇに変更した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。導電性繊維の太さは６．０ｄＴｅｘ、体積固有抵抗値は１×１０６Ωｃｍであった。結果を表１に示す。 Except for changing the polytetrafluoroethylene coating amount to 0.50 g per 5 decitex (dTex) and 10,000 m (10,000 meters) in length of the polyamide resin fiber (B1) in the conductive fiber In the same manner as in Example 1, conductive fibers, a raised brush for a conductive brush, and a conductive brush were produced, and the test was performed in the same manner as in Example 1. Thickness of the conductive fibers is 6.0 dtex, volume resistivity of 1 × 10 6 Ωcm. The results are shown in Table 1.
ポリアミド樹脂繊維（Ｂ）として太さ４．５ｄＴｅｘのポリアミド樹脂繊維（Ｂ２）を用い、フッ素化合物（Ｃ）としてポリテトラフルオロエチレンの代わりに、テトラフルオロエチレン成分の主鎖の炭素数が１０、エチレン成分の主鎖の炭素数が６であるエチレン−テトラフルオロエチレン共重合体を用い、導電性繊維における、ポリアミド樹脂繊維（Ｂ２）の、太さ５デシテックス（ｄＴｅｘ）且つ長さ１００００ｍ（１万メートル）当たりのエチレン−テトラフルオロエチレン共重合体の被覆量を、０．５ｇに変更した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。導電性繊維の太さは４．５ｄＴｅｘ、体積固有抵抗値は１×１０６Ωｃｍであった。結果を表１に示す。 A polyamide resin fiber (B2) having a thickness of 4.5 dTex is used as the polyamide resin fiber (B), and the main chain of the tetrafluoroethylene component is 10 instead of polytetrafluoroethylene as the fluorine compound (C), ethylene. Using an ethylene-tetrafluoroethylene copolymer having 6 carbon atoms in the main chain of the component, the thickness of the polyamide resin fiber (B2) in the conductive fiber is 5 decitex (dTex) and a length of 10,000 m (10,000 meters) ) A conductive fiber, a conductive brush raising fabric, and a conductive brush were produced in the same manner as in Example 1 except that the coating amount of the ethylene-tetrafluoroethylene copolymer was changed to 0.5 g. The test was conducted in the same manner as in Example 1. The thickness of the conductive fiber was 4.5 dTex, and the volume resistivity value was 1 × 10 6 Ωcm. The results are shown in Table 1.
〔比較例１〕
ポリテトラフルオロエチレンによるポリアミド樹脂繊維（Ｂ１）の被覆を行わなかった以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。導電性繊維の太さは６．０ｄＴｅｘ、体積固有抵抗値は１×１０６Ωｃｍであった。結果を表１に示す。
[Comparative Example 1]
Except that the polyamide resin fiber (B1) was not coated with polytetrafluoroethylene, a conductive fiber, a brushed fabric for a conductive brush, and a conductive brush were produced in the same manner as in Example 1. A similar test was conducted. The thickness of the conductive fiber was 6.0 dTex, and the volume resistivity value was 1 × 10 6 Ωcm. The results are shown in Table 1.
〔比較例２〕
導電性繊維における、ポリアミド樹脂繊維（Ｂ１）の、太さ５デシテックス（ｄＴｅｘ）当たり、且つ長さ１００００ｍ（１万メートル）当たりのポリテトラフルオロエチレンの被覆量を、０．００４ｇに変更した以外は、実施例１と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。導電性繊維の太さは６．０ｄＴｅｘ、体積固有抵抗値は１×１０６Ωｃｍであった。結果を表１に示す。
[Comparative Example 2]
Except for changing the polytetrafluoroethylene coating amount to 0.004 g per 5 decitex (dTex) and 10,000 m (10,000 meters) in length of the polyamide resin fiber (B1) in the conductive fiber In the same manner as in Example 1, conductive fibers, a raised brush for a conductive brush, and a conductive brush were produced, and the test was performed in the same manner as in Example 1. The thickness of the conductive fiber was 6.0 dTex, and the volume resistivity value was 1 × 10 6 Ωcm. The results are shown in Table 1.
〔比較例３〕
テトラフルオロエチレン成分の主鎖の炭素数が１０、エチレン成分の主鎖の炭素数が６であるエチレン−テトラフルオロエチレン共重合体によるポリアミド樹脂繊維（Ｂ２）の被覆を行わなかった以外は、実施例３と同様にして導電性繊維、導電性ブラシ用起毛布、及び導電性ブラシを作製し、実施例１と同様に試験を行った。導電性繊維の太さは４．５ｄＴｅｘ、体積固有抵抗値は１×１０６Ωｃｍであった。結果を表１に示す。
[Comparative Example 3]
Except that the polyamide resin fiber (B2) was not coated with an ethylene-tetrafluoroethylene copolymer in which the main chain of the tetrafluoroethylene component had 10 carbon atoms and the main chain of the ethylene component had 6 carbon atoms. Conductive fibers, a conductive brush raising cloth, and a conductive brush were produced in the same manner as in Example 3, and the test was performed in the same manner as in Example 1. The thickness of the conductive fiber was 4.5 dTex, and the volume resistivity value was 1 × 10 6 Ωcm. The results are shown in Table 1.
フッ素化合物（Ｃ）を被覆しなかった比較例１及び比較例３、並びにフッ素化合物（Ｃ）の被覆量の少ない比較例２では、試験終了後の導電性ブラシの導電性繊維にトナーが多く付着しているのが観察され、また画像の乱れが顕著であった。
これに対し、本発明の範囲内である実施例１〜３では、試験終了後の導電性ブラシの導電性繊維へのトナーの付着量が少ないのが観察され、また画像の乱れも少なかった。
In Comparative Example 1 and Comparative Example 3 where the fluorine compound (C) was not coated, and in Comparative Example 2 where the coating amount of the fluorine compound (C) was small, a large amount of toner adhered to the conductive fibers of the conductive brush after the test was completed. It was observed that the image was distorted.
On the other hand, in Examples 1 to 3 within the scope of the present invention, it was observed that the amount of toner adhered to the conductive fibers of the conductive brush after the test was completed, and the image was less disturbed.
Claims (7)
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| JP2005269599A JP2007077551A (en) | 2005-09-16 | 2005-09-16 | Conductive fiber, raised fabric for conductive brush, conductive brush |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009002995A (en) * | 2007-06-19 | 2009-01-08 | Konica Minolta Business Technologies Inc | Electrophotographic charging brush and image forming apparatus |
| WO2010064613A1 (en) * | 2008-12-02 | 2010-06-10 | 東レ株式会社 | Electrically conductive floc and electrically conductive brush |
| JP2010255158A (en) * | 2009-03-31 | 2010-11-11 | Toray Ind Inc | Electroconductive polyamide fiber and conductive brush |
| CN102283498A (en) * | 2011-07-01 | 2011-12-21 | 深圳创怡兴实业有限公司 | brush processing method |
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2005
- 2005-09-16 JP JP2005269599A patent/JP2007077551A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009002995A (en) * | 2007-06-19 | 2009-01-08 | Konica Minolta Business Technologies Inc | Electrophotographic charging brush and image forming apparatus |
| WO2010064613A1 (en) * | 2008-12-02 | 2010-06-10 | 東レ株式会社 | Electrically conductive floc and electrically conductive brush |
| JP5609638B2 (en) * | 2008-12-02 | 2014-10-22 | 東レ株式会社 | Conductive flock and conductive brush |
| KR20160031558A (en) * | 2008-12-02 | 2016-03-22 | 도레이 카부시키가이샤 | Electrically conductive floc and electrically conductive brush |
| KR101700237B1 (en) * | 2008-12-02 | 2017-01-26 | 도레이 카부시키가이샤 | Electrically conductive floc and electrically conductive brush |
| JP2010255158A (en) * | 2009-03-31 | 2010-11-11 | Toray Ind Inc | Electroconductive polyamide fiber and conductive brush |
| CN102283498A (en) * | 2011-07-01 | 2011-12-21 | 深圳创怡兴实业有限公司 | brush processing method |
| CN102283498B (en) * | 2011-07-01 | 2013-11-06 | 深圳创怡兴实业有限公司 | Brush processing method |
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