JPH05313471A - Conductive roller - Google Patents
Conductive rollerInfo
- Publication number
- JPH05313471A JPH05313471A JP4122252A JP12225292A JPH05313471A JP H05313471 A JPH05313471 A JP H05313471A JP 4122252 A JP4122252 A JP 4122252A JP 12225292 A JP12225292 A JP 12225292A JP H05313471 A JPH05313471 A JP H05313471A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- layer
- conductive
- resistance adjusting
- rubber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000010410 layer Substances 0.000 claims abstract description 79
- 229920005558 epichlorohydrin rubber Polymers 0.000 claims abstract description 20
- 239000011241 protective layer Substances 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 abstract description 24
- 229920001971 elastomer Polymers 0.000 abstract description 19
- 239000005060 rubber Substances 0.000 abstract description 19
- 239000000126 substance Substances 0.000 abstract description 14
- 239000002904 solvent Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 239000004952 Polyamide Substances 0.000 abstract description 2
- 229920002647 polyamide Polymers 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000006229 carbon black Substances 0.000 description 8
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000499 gel Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- OIXNFJTTYAIBNF-UHFFFAOYSA-N 2-(chloromethyl)oxirane;oxirane Chemical compound C1CO1.ClCC1CO1 OIXNFJTTYAIBNF-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000001687 destabilization Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229920005561 epichlorohydrin homopolymer Polymers 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 238000010345 tape casting Methods 0.000 description 1
- 229920001897 terpolymer Polymers 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は導電性ローラに係わり、
特に電子複写機等の現像装置に用いられる導電性ローラ
に関する。FIELD OF THE INVENTION The present invention relates to a conductive roller,
In particular, it relates to a conductive roller used in a developing device such as an electronic copying machine.
【０００２】[0002]
【従来の技術】従来から、電子複写機やレーザプリンタ
等の現像装置では、感光ドラム外周面を一様に帯電さ
せ、複写される画像が形成された原紙を介在させて光を
照射することにより、原紙の画像が形成されない部分を
透過した光が感光ドラムを照射して、その部分の帯電を
解除することにより、感光ドラム外周面上に原紙の画像
状の静電潜像を形成させる。その後、静電潜像が形成さ
れた感光ドラム上に逆の極性に帯電されたトナーを付着
させ、静電潜像状に付着されたトナーを複写用紙に転写
している。2. Description of the Related Art Conventionally, in a developing device such as an electronic copying machine or a laser printer, the outer peripheral surface of a photosensitive drum is uniformly charged, and light is emitted through a base paper on which an image to be copied is formed. The light transmitted through the portion of the base paper where the image is not formed irradiates the photosensitive drum, and the charging of the portion is released to form an electrostatic latent image in the form of an image of the base paper on the outer peripheral surface of the photosensitive drum. After that, the toner charged to the opposite polarity is attached onto the photosensitive drum on which the electrostatic latent image is formed, and the toner attached in the electrostatic latent image is transferred to the copy sheet.
【０００３】このような電子複写機では、図３に示すよ
うに感光ドラム１の回転方向と逆方向に回転する帯電ロ
ーラ２が感光ドラム１の外周面を摺動して感光ドラム１
の外周面を一様に帯電させる。一様に帯電された感光ド
ラム１を露光装置３により原稿４を介して照射し、原稿
４の画像が形成されない部分を透過した光が感光ドラム
１を照射して、感光ドラム１上に静電潜像を形成する。
その後外周に感光ドラム１の帯電と逆の極性のトナーが
一様に付着された現像ローラ５を感光ドラム１外周面に
押圧し、静電潜像上にトナーを付着させる。そして、転
写ローラ６により供給させる複写用紙７上にトナーを転
写し、定着ローラ８で複写用紙７上のトナーの定着を行
っている。感光ドラム１はその後クリーニングローラ９
で残存するトナーを除去され、１回の複写が終了する。In such an electronic copying machine, as shown in FIG. 3, a charging roller 2 which rotates in a direction opposite to the rotation direction of the photosensitive drum 1 slides on the outer peripheral surface of the photosensitive drum 1 to cause the photosensitive drum 1 to rotate.
The outer peripheral surface of is uniformly charged. The uniformly charged photosensitive drum 1 is radiated by the exposure device 3 through the original 4, and the light transmitted through the portion of the original 4 where the image is not formed illuminates the photosensitive drum 1 to electrostatically charge the photosensitive drum 1. Form a latent image.
After that, the developing roller 5 to which the toner having the opposite polarity to the charge of the photosensitive drum 1 is uniformly attached to the outer periphery is pressed against the outer peripheral surface of the photosensitive drum 1 to attach the toner on the electrostatic latent image. Then, the toner is transferred onto the copy paper 7 supplied by the transfer roller 6, and the fixing roller 8 fixes the toner on the copy paper 7. The photosensitive drum 1 is then cleaned with a cleaning roller 9
Then, the remaining toner is removed, and one copy is completed.
【０００４】このような現像装置においては帯電ローラ
２、現像ローラ５、転写ローラ６、クリーニングローラ
９等では感光ドラム１を帯電させたり、トナーの移動を
行うために導電性ローラが用いられる。導電性ローラは
芯金上に導電性弾性体層が形成されてなるものである。
導電性弾性体層はシリコーンゴム、ニトリルゴム、エチ
レンプロピレンゴム、ウレタンゴム等の合成ゴムを用い
て所望の弾性を得るようにし、導電性を付与するため、
これらの合成ゴム中にカーボン等の導電性粉末や、導電
性繊維等を混入している。In such a developing device, the charging roller 2, the developing roller 5, the transfer roller 6, the cleaning roller 9 and the like use conductive rollers to charge the photosensitive drum 1 and to move the toner. The conductive roller has a conductive elastic layer formed on a core metal.
The conductive elastic layer is made of synthetic rubber such as silicone rubber, nitrile rubber, ethylene propylene rubber, and urethane rubber so as to obtain a desired elasticity and to impart conductivity,
Conductive powder such as carbon and conductive fibers are mixed in these synthetic rubbers.
【０００５】このような導電性弾性体層を備えた導電性
ローラが要求される電気抵抗は１０〜１０11Ω・ｃｍで
あり、高画質な複写が得られるようローラ全体が均一に
帯電できるようにローラ全体が均一の電気抵抗を備える
ことが要求されている。The electric resistance required for a conductive roller having such a conductive elastic layer is 10 to 10 11 Ω · cm, so that the entire roller can be uniformly charged so as to obtain a high quality copy. It is required that the entire roller have uniform electric resistance.
【０００６】[0006]
【発明が解決すべき課題】しかしながら、導電性弾性体
層に混入された導電性粉末や、導電性繊維等を均一に混
入するのは困難であり、そのためこれらの導電性物質が
均一に分散されずに偏在してしまうことにより、導電性
が大幅に変動してしまい、安定した導電性を得るのは困
難であった。また、これらの導電性物質は導電性弾性体
層中で導電性粒子同志が接触することにより導電性が生
じるものであり、感光ドラムとの接触により変形する導
電性弾性体層においては、それ自体により均一な導電性
を得ることは困難であった。However, it is difficult to uniformly mix the conductive powder, the conductive fibers and the like mixed in the conductive elastic layer, so that these conductive substances are uniformly dispersed. Without being unevenly distributed, the conductivity greatly fluctuates, and it is difficult to obtain stable conductivity. Further, these conductive substances generate conductivity when the conductive particles come into contact with each other in the conductive elastic layer, and in the conductive elastic layer which is deformed by contact with the photosensitive drum, the conductive substance itself is formed. It was difficult to obtain uniform conductivity.
【０００７】また、１０〜１０11Ω・ｃｍの電気抵抗値
領域における電気抵抗は安定性に乏しく、周囲の温度、
湿度、製造条件等の若干の変化に伴い、大幅に変動して
しまった。そのため、他のゴム材より低い電気抵抗値を
有し、導電性ローラが要求される電気抵抗値をそれ自体
が有したエピクロルヒドリン−エチレンオキサイド等の
エピクロルヒドリン共重合体ゴムを主体としたゴムを被
覆した転写ローラもあった。しかしながら、エピクロル
ヒドリン共重合体ゴムを主体としたゴム層は機械的強度
が低く、摩擦抵抗が大きいため、耐摩耗性が悪く、エピ
クロルヒドリン共重合体層を最外層とすると、ローラの
寿命が短くなってしまうという問題があった。Further, the electric resistance in the electric resistance value region of 10 to 10 11 Ω · cm is poor in stability, and the ambient temperature,
It changed drastically with some changes in humidity and manufacturing conditions. Therefore, it has a lower electric resistance value than other rubber materials, and a rubber mainly composed of epichlorohydrin copolymer rubber such as epichlorohydrin-ethylene oxide, which itself has an electric resistance value required for a conductive roller, is coated. There was also a transfer roller. However, since the rubber layer mainly composed of epichlorohydrin copolymer rubber has low mechanical strength and high friction resistance, wear resistance is poor, and when the epichlorohydrin copolymer layer is the outermost layer, the life of the roller is shortened. There was a problem that it would end up.
【０００８】一方、高電圧下においては、導電性弾性体
層が絶縁破壊を生じて感光ドラムにダメージを与えてし
まうため、導電性弾性体層が絶縁破壊を起こすのを防止
するため、導電性弾性体層上に抵抗調整層を設けたもの
もあった。抵抗調整層は電気抵抗として１０5〜１０7Ω
・ｃｍが望まれる。この範囲の電気抵抗値を備えた抵抗
調整層を導電性弾性体層上に塗布して、所望の導電性を
得るようにしたものもあった。しかし、抵抗調整層を形
成するための塗布液に用いられる溶剤が導電性弾性体層
まで溶解し、導電性弾性体層に含有されるカーボンブラ
ックを析出させるため、画像が乱れる等の悪影響を及ぼ
してしまった。On the other hand, under high voltage, the conductive elastic layer causes dielectric breakdown and damages the photosensitive drum. Therefore, in order to prevent the conductive elastic layer from dielectric breakdown, the conductive In some cases, a resistance adjusting layer is provided on the elastic layer. The resistance adjustment layer has an electric resistance of 10 5 to 10 7 Ω
・ Cm is desired. In some cases, a resistance adjusting layer having an electric resistance value in this range is applied on the conductive elastic layer to obtain a desired conductivity. However, the solvent used in the coating liquid for forming the resistance adjusting layer dissolves up to the conductive elastic body layer and precipitates carbon black contained in the conductive elastic body layer, which adversely affects the image. I got it.
【０００９】本発明は、上記の欠点を解消するためにな
されたものであって、ローラの弾性体層が変形してもロ
ーラ全体に亘って均一な所望の電気抵抗を有し、しかも
機械的強度を備えた長寿命の導電性ローラを提供するこ
とを目的とする。The present invention has been made in order to solve the above-mentioned drawbacks, and has a desired uniform electric resistance over the entire roller even if the elastic layer of the roller is deformed, and the mechanical resistance is mechanical. An object of the present invention is to provide a long-life conductive roller having strength.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するた
め、本発明の導電性ローラは、芯金上に、導電性弾性体
層、抵抗調整層及び保護層が順次積層されてなる導電性
ローラであって、抵抗調整層はエピクロルヒドリンゴム
からなるものである。In order to achieve the above object, the conductive roller of the present invention is a conductive roller in which a conductive elastic body layer, a resistance adjusting layer and a protective layer are sequentially laminated on a core metal. The resistance adjusting layer is made of epichlorohydrin rubber.
【００１１】[0011]
【作用】芯金上に形成される導電性弾性体層上に、絶縁
破壊を防止するため導電性弾性体層より導電性が低い抵
抗調整層を設ける。抵抗調整層はゴム剤として導電性物
質を含まないエピクロルヒドリンゴムを含有する純ゴム
配合とする。エピクロルヒドリンゴムは、それ自体で導
電性ローラに所望の導電性を付与する体積抵抗値を有す
るため、導電性物質を添加することなく所望の体積抵抗
値を有する抵抗調整層が得られる。従って、抵抗調整層
が均一の導電性を備え、ローラ全体が均一の導電性を有
するようにでき、ローラが押圧されて変形しても均一の
導電性を保持することができる。このため、導電性物質
を添加することにより導電性が付与されるものとは異な
り、導電性物質の吸湿による導電性の不安定化がない。
更に、導電性物質が偏在することにより生じる導電性の
良否が起こることがない。また、カーボンブラック等の
導電性物質同志が摩擦することによって導電性が発せら
れるものとは異なり、常に均一な導電性が得られ、複写
機に用いられても、高画質な画像が得られる。更に、抵
抗調整層の上に設けられる保護層は、機械的強度の弱い
エピクロルヒドリンゴムから成る抵抗調整層を保護し、
ローラの強度を向上させることができる。A resistance adjusting layer having a lower conductivity than the conductive elastic layer is provided on the conductive elastic layer formed on the core metal in order to prevent dielectric breakdown. The resistance adjusting layer is made of a pure rubber compound containing epichlorohydrin rubber containing no conductive substance as a rubber agent. Since epichlorohydrin rubber itself has a volume resistance value that imparts a desired conductivity to the conductive roller, a resistance adjusting layer having a desired volume resistance value can be obtained without adding a conductive substance. Therefore, the resistance adjusting layer has uniform conductivity, and the entire roller can have uniform conductivity. Even if the roller is pressed and deformed, uniform conductivity can be maintained. Therefore, unlike the case where conductivity is imparted by adding a conductive substance, there is no destabilization of conductivity due to moisture absorption of the conductive substance.
Further, the quality of the conductivity caused by uneven distribution of the conductive substance does not occur. Further, unlike a material in which conductive materials such as carbon black rub against each other to generate conductivity, uniform conductivity is always obtained, and a high quality image is obtained even when used in a copying machine. Furthermore, the protective layer provided on the resistance adjusting layer protects the resistance adjusting layer made of epichlorohydrin rubber having low mechanical strength,
The strength of the roller can be improved.
【００１２】[0012]
【実施例】本発明の導電性ローラを現像ローラに適用し
た一実施例を図面を参照して説明する。図１に示す現像
ローラ１０は、芯金１２上に順次導電性弾性体層１３、
抵抗調整層１４及び保護層１５が積層されて成るもので
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the conductive roller of the present invention is applied to a developing roller will be described with reference to the drawings. The developing roller 10 shown in FIG. 1 includes a cored bar 12 on which a conductive elastic layer 13,
The resistance adjusting layer 14 and the protective layer 15 are laminated.
【００１３】芯金１２は、強度上、鉄、アルミ等の金属
が好ましい。芯金１２上に積層される導電性弾性体層１
３は、エチレン・プロピレンゴム、ブチルゴム、スチレ
ンブタジエンゴム、ポリクロロプレンゴム、ブタジエン
ゴム、フッ素ゴム、シリコーンゴム等が用いられ、これ
らにカーボン等の導電性物質を添加して、所望の導電性
が付与されるようにする。特に、導電性物質としてカー
ボンブラックを添加する場合、カーボンブラックと混練
性がよく均一に添加できるゴムとしてエチレン・プロピ
レンゴムを用いたものが好ましい。導電性弾性体層１３
の抵抗値は１０3〜１０5Ω・ｃｍが好適である。The core metal 12 is preferably a metal such as iron or aluminum in terms of strength. Conductive elastic layer 1 laminated on the cored bar 12
3, ethylene / propylene rubber, butyl rubber, styrene butadiene rubber, polychloroprene rubber, butadiene rubber, fluororubber, silicone rubber, etc. are used, and a conductive substance such as carbon is added to these to impart desired conductivity. To be done. In particular, when carbon black is added as a conductive substance, it is preferable to use ethylene / propylene rubber as a rubber that has good kneading properties with carbon black and can be uniformly added. Conductive elastic layer 13
The resistance value of 10 3 to 10 5 Ω · cm is suitable.
【００１４】導電性弾性体層１３は予め、カーボンブラ
ック等を配合したエチレンプロピレンゴムをプレス成形
したものを芯金１２の周囲に巻きつけ、円筒に研削して
作成する。導電性弾性体層１３上に成形される抵抗調整
層１４は、ゴム剤としてはエピクロルヒドリンのみを含
むエピクロルヒドリン純ゴム配合とする。具体的には、
エピクロルヒドリン−エチレンオキサイド共重合ゴム、
エピクロルヒドリン−エチレンオキサイド−アリルグリ
シジルエーテル３元共重合体ゴム、エピクロルヒドリン
ホモポリマー等がある。エピクロルヒドリンゴムは、そ
れ自体で体積抵抗値が１０9Ω・ｃｍであり、環境に左
右されず安定した体積抵抗値を有するものである。ゴム
剤として、エピクロルヒドリンゴムのみから成る抵抗調
整層１４は、所望の体積抵抗値を備え、添加物により導
電性付与するものとは異なり、導電性はローラ全体に亘
って一定であり、そのためローラが変形して摩擦を受け
ても導電性が変化することなく一定の体積抵抗値が保持
される。従って、ローラの導電性は非常に安定される。The conductive elastic layer 13 is prepared by press-molding ethylene propylene rubber mixed with carbon black or the like in advance around the cored bar 12 and grinding it into a cylinder. The resistance adjusting layer 14 formed on the conductive elastic layer 13 is made of epichlorohydrin pure rubber compound containing only epichlorohydrin as a rubber agent. In particular,
Epichlorohydrin-ethylene oxide copolymer rubber,
There are epichlorohydrin-ethylene oxide-allyl glycidyl ether terpolymer rubber, epichlorohydrin homopolymer and the like. The epichlorohydrin rubber has a volume resistance value of 10 9 Ω · cm by itself, and has a stable volume resistance value regardless of the environment. As the rubber agent, the resistance adjusting layer 14 made of only epichlorohydrin rubber has a desired volume resistance value, and unlike the one in which the conductivity is imparted by the additive, the conductivity is constant over the entire roller, so that the roller is Even if it is deformed and subjected to friction, the conductivity does not change and a constant volume resistance value is maintained. Therefore, the conductivity of the roller is very stable.
【００１５】エピクロルヒドリンゴムに配合される配合
剤としては、導電性物質以外の添加剤を配合することが
でき、受酸剤（加硫促進剤）及び加硫剤のみを添加する
のが好ましい。受酸剤としては、吸湿性の低い鉛丹等が
特に好ましい。このようなエピクロルヒドリンゴムの抵
抗調整層１４を形成するには、受酸剤等を配合したエピ
クロルヒドリンゴムを、溶剤で溶解し、エピクロルヒド
リン溶液を用いてディッピング法、スプレー塗布法、ド
クターナイフによるコーティング法等で導電性弾性体層
上に塗布し、加熱硬化する。As the compounding agent to be compounded in the epichlorohydrin rubber, additives other than the conductive substance can be compounded, and it is preferable to add only the acid acceptor (vulcanization accelerator) and the vulcanizing agent. As the acid-accepting agent, red lead and the like having low hygroscopicity are particularly preferable. In order to form such a resistance adjusting layer 14 of epichlorohydrin rubber, epichlorohydrin rubber mixed with an acid acceptor or the like is dissolved in a solvent, and a dipping method, a spray coating method, a doctor knife coating method or the like using an epichlorohydrin solution is used. Then, it is applied on the conductive elastic layer and cured by heating.
【００１６】ここで、エピクロルヒドリンゴムの溶剤と
して、例えばキシレン、トルエン、ガソリン等では抵抗
調整層が積層されるエチレンプロピレンゴム等からなる
導電性弾性体層をも溶融するため、カーボンブラックを
析出し、析出されたカーボンブラックはエピクロルヒド
リンゴムの塗布液に作用してゲル化してしまうため、導
電性弾性体層を溶融しないものが好ましい。導電性弾性
体層を溶融せず、しかもエピクロルヒドリンゴムを選択
的に溶融するものとして酢酸エチルが好適に用いられ
る。エピクロルヒドリンの溶剤として酢酸エチルを用い
れば、導電性弾性体層上に塗布しても導電性弾性体層を
溶解することがないため、カーボンブラックが析出し、
エピクロルヒドリンゴム溶液がゲル化してしまうことが
ない。また、酢酸エチルは輝発性のため溶剤は自ずと除
去され、残存しないため好適に用いられる。酢酸エチル
はエピクロルヒドリン５〜２０ｇに対して１００ｃｃで
溶解するようにする。得られる抵抗調整層はゴム剤とし
てエピクロルヒドリンゴムのみを含有し、導電性物質を
含有させることにより吸湿性が増大するものとは異な
り、吸湿性を有さず外界の影響を受けない。図２に示す
エピクロルヒドリンゴムから成る抵抗調整層１４の体積
抵抗値と温度の関係からも分るように、抵抗調整層１４
はローラ全体に亘って均一で一定の体積抵抗値を有す
る。As a solvent for epichlorohydrin rubber, for example, xylene, toluene, gasoline, etc., the conductive elastic layer made of ethylene propylene rubber or the like on which the resistance adjusting layer is laminated is also melted, so that carbon black is deposited, Since the deposited carbon black acts on the coating solution of epichlorohydrin rubber and gels, it is preferable that the conductive elastic layer is not melted. Ethyl acetate is preferably used as a material that does not melt the conductive elastic layer and selectively melts the epichlorohydrin rubber. If ethyl acetate is used as the solvent for epichlorohydrin, the conductive elastic layer does not dissolve even when applied on the conductive elastic layer, so carbon black is deposited,
The epichlorohydrin gum solution does not gel. In addition, since ethyl acetate is a bright agent, the solvent is naturally removed and does not remain, so ethyl acetate is preferably used. Ethyl acetate is dissolved in 100 cc for 5 to 20 g of epichlorohydrin. The obtained resistance adjusting layer contains only epichlorohydrin rubber as a rubber agent, and unlike the one in which the hygroscopic property is increased by containing a conductive substance, it has no hygroscopic property and is not affected by the external environment. As can be seen from the relationship between the volume resistance value and the temperature of the resistance adjusting layer 14 made of epichlorohydrin rubber shown in FIG.
Has a uniform and constant volume resistance value over the entire roller.
【００１７】更に、このような抵抗調整層の外側に保護
層１５を設ける。保護層１５は機械的強度が弱いエピク
ロルヒドリンから成る抵抗調整層を被覆し、ローラの強
度を増大させるために設けられ、特にポリアミドを架橋
させたものが好ましい。保護層を形成するためには、抵
抗調整層上に塗布液として塗布し、加熱硬化させる。得
られる現像ローラのゴム硬度（ＪＩＳ−Ａ）は、２５〜
４５°範囲のものである。 ［実施例１］鉄製芯金を溶剤で脱脂後、加硫接着剤（商
品名：ケムロック２０５／２３３）を塗布・乾燥し、導
電性カーボンブラック（電気化学株式会社製 商品名：
アセチレンブラック）を配合したエチレンプロピレンゴ
ムをプレス成形により成形、研削し、導電性弾性体層を
作成した。その後、エピクロルヒドリンゴム（ダイソー
株式会社製 商品名：エピクロマーＣ）１００に対し、
受酸剤（カーボン化成株式会社製 商品名：鉛丹レビタ
ルマスター）６．２５ｐＨＲ、加硫剤２ｐＨＲを混練
し、酢酸エチルで溶解し、この溶液にローラを含浸させ
抵抗調整層を形成した。Further, a protective layer 15 is provided outside the resistance adjusting layer. The protective layer 15 is provided to cover the resistance adjusting layer made of epichlorohydrin having low mechanical strength to increase the strength of the roller, and is preferably made of polyamide crosslinked. In order to form the protective layer, it is applied on the resistance adjusting layer as a coating liquid and cured by heating. The rubber hardness (JIS-A) of the obtained developing roller is 25 to
It is in the range of 45 °. [Example 1] After degreasing an iron cored bar with a solvent, a vulcanizing adhesive (product name: Chemlock 205/233) was applied and dried, and conductive carbon black (product name: Denki Kagaku Co., Ltd .:
Ethylene propylene rubber containing acetylene black was molded by press molding and ground to form a conductive elastic layer. Then, for epichlorohydrin rubber (Daiso Co., Ltd. product name: Epichromer C) 100,
An acid acceptor (manufactured by Carbon Chemical Co., Ltd., trade name: Lead Tan Revital Master) 6.25 pHR and a vulcanizing agent 2 pHR were kneaded and dissolved with ethyl acetate, and the solution was impregnated with a roller to form a resistance adjusting layer.
【００１８】得られた抵抗調整層をローラの長手方向に
順に５点で体積抵抗値を測定した。測定値はそれぞれ、
２．８×１０7Ω・ｃｍ、２．３×１０7Ω・ｃｍ、２．
２×１０7Ω・ｃｍ、２．４×１０7Ω・ｃｍ、２．８×
１０7Ω・ｃｍであった。比較例１として抵抗調整層の
組成として、上記実施例１の他に補強剤５０ｐＨＲ、可
塑剤２０ｐＨＲを混練し、同様にして抵抗調整層を作成
した。得られた抵抗調整層をローラの長平方向に順に５
点で体積抵抗値を測定した。測定値はそれぞれ、１．３
×１０7Ω・ｃｍ、８．２×１０6Ω・ｃｍ、７．７×１
０6Ω・ｃｍ、９．８×１０6Ω・ｃｍ、３．６×１０7
Ω・ｃｍであった。The volume resistance of the obtained resistance adjusting layer was measured at five points in the longitudinal direction of the roller. The measured values are
2.8 × 10 7 Ω · cm, 2.3 × 10 7 Ω · cm, 2.
2 × 10 7 Ω · cm, 2.4 × 10 7 Ω · cm, 2.8 ×
It was 10 7 Ω · cm. As Comparative Example 1, as the composition of the resistance adjusting layer, in addition to Example 1 described above, a reinforcing agent of 50 pHR and a plasticizer of 20 pHR were kneaded to prepare a resistance adjusting layer in the same manner. The obtained resistance adjusting layer was sequentially applied in the longitudinal direction of the roller.
The volume resistance value was measured at the points. Each measured value is 1.3
× 10 7 Ω · cm, 8.2 × 10 6 Ω · cm, 7.7 × 1
0 6 Ω · cm, 9.8 × 10 6 Ω · cm, 3.6 × 10 7
It was Ω · cm.
【００１９】実施例１の抵抗調整層は、比較例の抵抗調
整層の体積抵抗値がローラの長手方向にばらつきが生じ
ているのに対し、ローラ全体に亘って均一な体積抵抗値
を備えたものであった。 ［実施例２］更に、実施例１で得られたローラ上に以下
の組成の塗布液を厚さ２０μｍの厚さに塗布し、１２５
°Ｃで１５分加熱・架橋し保護層を作成した。得られた
保護層の引張強度は２００ｋｇｆ／ｃｍ2、伸びは５７
５％であった。The resistance adjusting layer of Example 1 has a uniform volume resistance value over the entire roller, whereas the volume resistance value of the resistance adjusting layer of the comparative example varies in the longitudinal direction of the roller. It was a thing. Example 2 Furthermore, a coating solution having the following composition was applied on the roller obtained in Example 1 to a thickness of 20 μm,
A protective layer was prepared by heating and crosslinking at ° C for 15 minutes. The protective layer thus obtained has a tensile strength of 200 kgf / cm 2 and an elongation of 57.
It was 5%.
【００２０】尚、抵抗調整層の引張強度は４８ｋｇｆ／
ｃｍ2、伸びは６５７％であった。実施例の保護層は保
護層を設けないものと比べ、非常に強度が高いものであ
った。上記説明は本発明の一実施例であり、本発明は現
像ローラに限らず導電性ローラならば何れのものにも適
用できる。The tensile strength of the resistance adjusting layer is 48 kgf /
The cm 2 and the elongation were 657%. The protective layer of the example had very high strength as compared with the protective layer not provided. The above description is one embodiment of the present invention, and the present invention is not limited to the developing roller and can be applied to any conductive roller.
【００２１】[0021]
【発明の効果】以上の説明からも明らかなように、本発
明の導電性ローラによれば、導電性弾性体層上に導電性
物質を含有しないエピクロルヒドリンゴムからなる抵抗
調整層を設けたため、外界に影響されずローラ全体とし
て均一な一定の体積抵抗値を有するローラが得られる。
しかも、抵抗調整層上に保護層を設けたため機械的強度
も十分であり、しかも抵抗調整層を備えているためロー
ラが絶縁破壊を受けにくく、長寿命のローラが得られ
る。As is apparent from the above description, according to the conductive roller of the present invention, the resistance adjusting layer made of epichlorohydrin rubber containing no conductive substance is provided on the conductive elastic body layer. A roller having a uniform and constant volume resistance value as a whole is obtained without being affected by.
In addition, since the protective layer is provided on the resistance adjusting layer, the mechanical strength is sufficient, and since the roller is provided with the resistance adjusting layer, the roller is less susceptible to dielectric breakdown and a long-life roller can be obtained.
【図１】本発明の一実施例の断面図。FIG. 1 is a sectional view of an embodiment of the present invention.
【図２】図１に示す一実施例の特性を示す図。FIG. 2 is a diagram showing characteristics of the embodiment shown in FIG.
【図３】本発明及び従来例の導電性ローラが適用される
電子複写機の現像装置を示す構成図。FIG. 3 is a configuration diagram showing a developing device of an electronic copying machine to which a conductive roller of the present invention and a conventional example are applied.
１０…………現像ローラ（導電性ローラ） １２…………芯金 １３…………導電性弾性体層 １４…………抵抗調整層 １５…………保護層 10 Development roller (conductive roller) 12 Core metal 13 Conductive elastic layer 14 Resistance adjustment layer 15 Protection layer
───────────────────────────────────────────────────── フロントページの続き (72)発明者 太田 稔 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 (72)発明者 今 修二 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 (72)発明者 國島 敏賢 神奈川県川崎市川崎区小田栄２丁目１番１ 号 昭和電線電纜株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Ota Minoru Ota 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. (72) Shuji Ima, 2 Sakae Oda, Kawasaki-ku, Kanagawa 1st-1st Showa Cable Electric Co., Ltd. (72) Inventor Toshiken Kunishima 2-1-1 1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Cable Electric Co., Ltd.
Claims (1)
び保護層が順次積層されてなる導電性ローラであって、
前記抵抗調整層はエピクロルヒドリンゴムからなること
を特徴とする導電性ローラ。1. A conductive roller in which a conductive elastic body layer, a resistance adjusting layer and a protective layer are sequentially laminated on a core metal,
The conductive roller, wherein the resistance adjusting layer is made of epichlorohydrin rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4122252A JPH05313471A (en) | 1992-05-14 | 1992-05-14 | Conductive roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4122252A JPH05313471A (en) | 1992-05-14 | 1992-05-14 | Conductive roller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05313471A true JPH05313471A (en) | 1993-11-26 |
Family
ID=14831356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4122252A Withdrawn JPH05313471A (en) | 1992-05-14 | 1992-05-14 | Conductive roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05313471A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011090A (en) * | 1996-12-13 | 2000-01-04 | Mitsubishi Chemical Corporation | Resin composition, conductive roller prepared by molding the composition and electronic photographic cartridge |
-
1992
- 1992-05-14 JP JP4122252A patent/JPH05313471A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011090A (en) * | 1996-12-13 | 2000-01-04 | Mitsubishi Chemical Corporation | Resin composition, conductive roller prepared by molding the composition and electronic photographic cartridge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990803 |