JPH0320763A - Developing roll of electrophotographic copying machine - Google Patents
Developing roll of electrophotographic copying machineInfo
- Publication number
- JPH0320763A JPH0320763A JP1154470A JP15447089A JPH0320763A JP H0320763 A JPH0320763 A JP H0320763A JP 1154470 A JP1154470 A JP 1154470A JP 15447089 A JP15447089 A JP 15447089A JP H0320763 A JPH0320763 A JP H0320763A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- developing roll
- resin layer
- powder
- volume resistivity
- 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.)
- Pending
Links
- 229920005989 resin Polymers 0.000 claims abstract description 52
- 239000011347 resin Substances 0.000 claims abstract description 52
- 239000000843 powder Substances 0.000 claims abstract description 37
- 239000006229 carbon black Substances 0.000 claims abstract description 19
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 17
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 abstract description 15
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 239000006185 dispersion Substances 0.000 abstract description 2
- 229910001111 Fine metal Inorganic materials 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 21
- 238000002156 mixing Methods 0.000 description 6
- 239000011342 resin composition Substances 0.000 description 5
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 108091008695 photoreceptors Proteins 0.000 description 3
- 229920006380 polyphenylene oxide Polymers 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000004727 Noryl Substances 0.000 description 2
- 229920001207 Noryl Polymers 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910052712 strontium Inorganic materials 0.000 description 2
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229930182556 Polyacetal Natural products 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229920000554 ionomer Polymers 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、電子写真複写機用現像ロールに関する。[Detailed description of the invention] Industrial applications The present invention relates to a developing roll for an electrophotographic copying machine.
従来の技術
従来一成分現像法式に使用される電子写真現像装置にお
ける現像ロールとしては、現像スリーブに導電性材料を
用いたものの外、合成樹脂中に導電性徴粉末を分散した
形態の半導電性樹脂組或物が製造され、使用されている
。その様な樹脂組成物を用いたスリーブについては、結
着樹脂中に高導電性の金属粉末やカーボン粉末を分散さ
せたもの、或いは低導電性の金属酸化物粉末を配合した
もの等が知られている。2. Description of the Related Art Conventionally, the developing roll in an electrophotographic developing device used in a one-component developing method is not only one in which a conductive material is used for the developing sleeve, but also a semiconductive resin in the form of a synthetic resin in which conductive powder is dispersed. An assembly is manufactured and used. Sleeves using such resin compositions include those in which highly conductive metal powder or carbon powder is dispersed in a binder resin, or those in which low conductivity metal oxide powder is blended. ing.
発明が解決しようとする課題
ところが、結着樹脂中に高導電性の金属粉末やカーボン
粉末を分散させて、１０９〜１０Ｉ２Ω（７）程度の体
積抵抗率を有する抵抗体としたものを用いた現像ロール
は、その体積抵抗率は極めて不安定であり、そのバラツ
キも数桁以上であって、均一性が悪いという問題があっ
た。The problem to be solved by the invention, however, is development using a resistor having a volume resistivity of about 109 to 10I2Ω (7) by dispersing highly conductive metal powder or carbon powder in a binder resin. The roll has a problem in that its volume resistivity is extremely unstable, and its variation is several orders of magnitude or more, resulting in poor uniformity.
一方、体積抵抗率の均一性を向上させるものとして、低
導電性の金属酸化物粉末を分散させたものを用いた場合
には、要求される体積抵抗率のものにするためには、多
量の金属酸化物粉末を必要とし、樹脂組或物の成形加工
性および機械的特性の著しい劣化を招くという問題が生
じた。On the other hand, when dispersing low-conductivity metal oxide powder is used to improve the uniformity of volume resistivity, it is necessary to use a large amount of powder to obtain the required volume resistivity. A problem arose in that metal oxide powder was required, leading to significant deterioration in moldability and mechanical properties of the resin composition.
本発明は、従来の技術における上記のような実状に鑑み
てなされたものである。The present invention has been made in view of the above-mentioned actual situation in the prior art.
したがって、本発明の目的は、上記のような欠点を除去
した任意の均一な体積抵抗率を有する表面層を設けた電
子写真複写機用現像ロールを提供することにある。Therefore, an object of the present invention is to provide a developing roll for an electrophotographic copying machine provided with a surface layer having an arbitrary uniform volume resistivity, which eliminates the above-mentioned drawbacks.
課題を解決するための手段
本発明の電子写真複写機用現像ロールは、結着樹脂１０
０重量部中に１０〜３５重量部のカーボンブラック微粉
末と５０〜２３０重量部の金属酸化物粉末とを分散して
なる体積抵抗率が１０９〜ｔ０１２Ω（７）の樹脂層を
表面に設けてなることを特徴とする。本発明の電子写真
複写機用現像ロールは、上記の構或を有することによっ
て、体積抵抗率のバラッキが０．５桁以内になり、極め
て高い均一性を有する半導電性樹脂層を有するものとな
る。Means for Solving the Problems The developing roll for an electrophotographic copying machine of the present invention comprises a binder resin 10
A resin layer having a volume resistivity of 109 to t012Ω (7), which is made by dispersing 10 to 35 parts by weight of fine carbon black powder and 50 to 230 parts by weight of metal oxide powder in 0 parts by weight, is provided on the surface. It is characterized by becoming. By having the above-described structure, the developing roll for an electrophotographic copying machine of the present invention has a semiconductive resin layer with a variation in volume resistivity within 0.5 digits and extremely high uniformity. Become.
以下、本発明の電子写真複写機用現像ロールを図面を参
酌して詳細に説明する。Hereinafter, the developing roll for an electrophotographic copying machine according to the present invention will be described in detail with reference to the drawings.
第１図は、電子写真複写機の現像部を示す概略断面図で
ある。図中、ｌはドラム状の感光体、２は現像機箱体で
あり、現像ロールは、樹脂層３及び現像ロール芯金４よ
り構成されている。また、５はトナー溜り、６はトナー
粒子、７は層規制部材である。樹脂層３は、電源に接続
されている現像ロール芯金４から供給される電荷により
、トナー粒子６を表面に付着させ、トナー溜り５がら感
光体ｌへと回転してトナー粒子を搬送する。その搬送に
必要な電荷を樹脂層３表面に均一に発生させるために、
樹脂層３は１０９〜１０１２Ω（１）の範囲の均一な体
積抵抗率を有することが要求される。FIG. 1 is a schematic cross-sectional view showing a developing section of an electrophotographic copying machine. In the figure, l is a drum-shaped photoreceptor, 2 is a developing machine box, and the developing roll is composed of a resin layer 3 and a developing roll core 4. Further, 5 is a toner reservoir, 6 is a toner particle, and 7 is a layer regulating member. The resin layer 3 attaches toner particles 6 to its surface by electric charges supplied from a developing roll core metal 4 connected to a power source, rotates from the toner reservoir 5 to the photoreceptor l, and conveys the toner particles. In order to uniformly generate the charge necessary for the transport on the surface of the resin layer 3,
The resin layer 3 is required to have a uniform volume resistivity in the range of 10 9 to 10 12 Ω(1).
本発明においては、樹脂層３が、結着樹脂ｌｏｏ重量部
中に１０〜３５重ｍ部のカーボンブラック微粉末と５０
〜２３０重量部の金属酸化物粉末とを分散して構成され
、それによって１０９〜１０１２Ω（７）の範囲の均一
な体積抵抗率を有するものになる。In the present invention, the resin layer 3 contains 10 to 35 parts by weight of fine carbon black powder and 50 to 35 parts by weight of fine carbon black powder in loo parts by weight of the binder resin.
~230 parts by weight of metal oxide powder, resulting in a uniform volume resistivity in the range of 109 to 1012 ohms (7).
第２図は、現像ロールの部分拡大図である。図中、３は
樹脂層、４は現像ロール芯金、３ｌは金属酸化物粒子、
３２はカーボンブラック粒子、３３は結着樹脂である。FIG. 2 is a partially enlarged view of the developing roll. In the figure, 3 is a resin layer, 4 is a developing roll core, 3l is a metal oxide particle,
32 is carbon black particles, and 33 is a binder resin.
また、第３図は、樹脂層における結着樹脂中での粒子の
分散状態を示す模式図である。本発明における樹脂層に
おいて、金属酸化物粒子３Ｉとカーボンブラック粒子３
２が結着樹脂３３中に均一に分散されており、それによ
って体積抵抗率の均一性が実現できる。Further, FIG. 3 is a schematic diagram showing the state of dispersion of particles in the binder resin in the resin layer. In the resin layer in the present invention, metal oxide particles 3I and carbon black particles 3
2 is uniformly dispersed in the binder resin 33, thereby achieving uniformity in volume resistivity.
本発明において、結着樹脂としては、特に限定されるも
のではなく、例えば、変性ポリフェニレンオキサイド、
アイオノマー樹脂、ＡＢＳ樹脂、ポリアセタール樹脂、
ＥＶＡ樹脂（エチレンー酢酸ビニル共重合体）、ボリア
ミド樹脂、ポリアリレート樹脂、ポリエチレン樹脂、ポ
リカーボネート樹脂、ポリエステル樹脂、ポリプロピレ
ン樹脂、ＥＥＡＩ脂（エチレンーエチルアクリレート共
重合体）、ボリフェニレンサルファイド樹脂、ボリスチ
レン樹脂、ＡＳ樹脂（スチレンーアクリロニトリル共重
合体）、エボキシ樹脂、廖化ビニル樹脂等、各種の合成
樹脂があげられる。In the present invention, the binder resin is not particularly limited, and examples include modified polyphenylene oxide,
Ionomer resin, ABS resin, polyacetal resin,
EVA resin (ethylene-vinyl acetate copolymer), polyamide resin, polyarylate resin, polyethylene resin, polycarbonate resin, polyester resin, polypropylene resin, EEAI resin (ethylene-ethyl acrylate copolymer), polyphenylene sulfide resin, polystyrene resin, Various synthetic resins include AS resin (styrene-acrylonitrile copolymer), epoxy resin, and vinyl resin.
金属酸化物粉末としては、体積抵抗率１０’〜ｌ０１０
Ω・（７）を有するものが適している。具体的には、酸
化亜鉛、酸化鉄、ストロンチウムフェライト、酸化すず
、バリウムフエライト、マグネタイト等の粉末が使用さ
れる。これら粉末の平均粒径としでは、０．５〜２ａｍ
程度のものが好適である。The metal oxide powder has a volume resistivity of 10' to 1010
A material having Ω·(7) is suitable. Specifically, powders of zinc oxide, iron oxide, strontium ferrite, tin oxide, barium ferrite, magnetite, etc. are used. The average particle size of these powders is 0.5 to 2 am.
It is preferable that the
これら金属酸化物粉末はその配合量が大きくなると、樹
脂組成物の戊型・加工性が劣り、機械的特性が低いもの
になるので、合或樹脂ｌ００重量部に対して５０〜２３
０重量部の範囲で配合されるのが好ましい。その配合量
が５０重量部より少なくなると、配合による導電性付与
効果を安定して得ることができない。If the amount of these metal oxide powders is too large, the resin composition will have poor shape and processability, and its mechanical properties will be low.
It is preferable that the amount is 0 parts by weight. If the blending amount is less than 50 parts by weight, the effect of imparting conductivity cannot be stably obtained by blending.
又、カーボンブラック微粉末としては、平均粒径０、１
一以下の微粉末が好ましい。カーボンブラック微粉末の
配合量は、合戊樹脂１００重量部に対してＬＯ〜３５重
量部であり、この範囲の配合量の場合には、カーボンブ
ラック微粉末によって形成される導電路の間に、金属酸
化物の粒子が介在するようになり、バラツキの小さい体
積抵抗率の半導電性樹脂組或物が得られる。しかしなが
ら、力一ボンブラック微粉末が、３５重量部よりも多く
なると、カーボンブラック微粉末がそれ自体で導電路を
形戊するようになり、体積抵抗率のバラツキが大きくな
り、０．５桁以内のバラツキのものを得ることができな
くなる。又、配合量が１０重量％より低くなると、カー
ボンブラック微粉末を配合したことによる効果が得られ
なくなる。In addition, as carbon black fine powder, the average particle size is 0, 1
A fine powder of 1 or less is preferred. The blending amount of the carbon black fine powder is LO to 35 parts by weight per 100 parts by weight of the composite resin, and when the blending amount is in this range, between the conductive paths formed by the carbon black fine powder, Metal oxide particles are present, and a semiconductive resin composition having a volume resistivity with small variations can be obtained. However, when the carbon black fine powder exceeds 35 parts by weight, the carbon black fine powder begins to form a conductive path by itself, and the variation in volume resistivity becomes large and becomes less than 0.5 digits. It is no longer possible to obtain a product with a wide range of variations. Moreover, if the blending amount is lower than 10% by weight, the effect of blending the carbon black fine powder will not be obtained.
実施例
本発明における現像ロールを作成するには、適当な樹脂
を２本ロールを用いて混練しながら、金属酸化物粉末お
よびカーボンブラック微粉末を加え、シート状に成形し
た混線物を、金属製の現像ロール芯金に巻き付け、それ
を２分割金型に装着し、圧縮成形によって固着させれば
よい。なお、樹脂層の肉厚は、０．５ｍｍ〜２ｌｌｌＩ
Ｉであるのが好ましい。EXAMPLE To make the developing roll of the present invention, metal oxide powder and fine carbon black powder are added to a suitable resin while kneading it using two rolls, and the mixed wire material is formed into a sheet shape. The film may be wound around a developing roll core metal, mounted on a two-part mold, and fixed by compression molding. The thickness of the resin layer is 0.5 mm to 2 mm.
I is preferred.
以下、現像ロールについての具体例を示す。A specific example of the developing roll will be shown below.
例１
変性ポリフエニレンオキサイド樹脂（ノリルＮ１．９０
Ｊ， ＥＰＬ製）に、酸化亜鉛（ＺｎＯ−Ｒ ，東邦亜
鉛■製）１５０重量部とカーボンプラック微粉末（旭！
１８５００ 、旭カーボン社製）２５重量部を練り込ん
だものを使用し、体積抵抗率が１．９８ＸｌＯ”Ω（７
）で、そのバラツキが０．３９桁以内である樹脂層（肉
厚１ｍｍ）を有する現像ロールを得た。Example 1 Modified polyphenylene oxide resin (Noryl N1.90
J, manufactured by EPL), 150 parts by weight of zinc oxide (ZnO-R, manufactured by Toho Zinc ■) and fine carbon plack powder (Asahi!).
18500, manufactured by Asahi Carbon Co., Ltd.) was used, and the volume resistivity was 1.98XlO''Ω (7
), a developing roll having a resin layer (thickness: 1 mm) whose variation was within 0.39 digits was obtained.
例２
変性ポリフエニレンオキサイド樹脂（ノリルＮｌ９０Ｊ
、ＥＰＬ製）に、ストロンチウム●フェライト（ＤＢ７
００、戸田工業側製）２００重量部とカーボンブラック
微粉末（旭ＩＳ５００ 、旭カーボン社製）３５重量部
を練り込んだものを使用し、体積抵抗率が３．２ ８Ｉ
ＯＩ０Ω印で、そのバラツキが０．４７桁以内である樹
脂層（肉厚Ｌｍｍ）を有する現像ロールを得た。Example 2 Modified polyphenylene oxide resin (Noryl Nl90J
, manufactured by EPL), strontium ferrite (DB7
00, manufactured by Toda Kogyo Co., Ltd.) and 35 parts by weight of fine carbon black powder (Asahi IS500, manufactured by Asahi Carbon Co., Ltd.) were used, and the volume resistivity was 3.2 8I.
A developing roll having a resin layer (thickness L mm) with an OI 0Ω mark and a variation within 0.47 digits was obtained.
なお、樹脂層の体積抵抗率は、現像ロールの樹脂層表面
に塗布して形威されたｌｏｍ＋ｓ角の塗布電極と、金属
製現像ロール芯金との間の抵抗を絶縁抵抗計で測定たち
のである。なお、塗布電極は１本の現像ロールにつき６
か所作成し、測定に供した。The volume resistivity of the resin layer is measured by using an insulation resistance meter to measure the resistance between a lom + s square coated electrode coated on the surface of the resin layer of the developer roll and the metal core of the developer roll. be. The number of applied electrodes is 6 per developing roll.
A sample was prepared and used for measurement.
上記の現像ロールを第１図に示す構造の電子写真複写機
の現像機に装着し、トナーの搬送量を測定したところ、
０，９±０．０２■／ｃｊで安定しており、更にソリッ
ド・コピーを現像したところ、色ムラのない極めて均一
な画像が得られた。When the above-mentioned developing roll was attached to the developing machine of an electrophotographic copying machine having the structure shown in FIG. 1, and the amount of toner conveyed was measured.
It was stable at 0.9±0.02 .mu./cj, and when a solid copy was further developed, an extremely uniform image without color unevenness was obtained.
なお、本発明の現像ロールの樹脂層を形成する半導電性
樹脂組成物は、例えば、帯電・除電・クリーニング用の
コロトロンや定着ロールとしても応用することができる
。The semiconductive resin composition forming the resin layer of the developing roll of the present invention can also be applied, for example, to a corotron for charging, neutralizing, and cleaning, and a fixing roll.
発明の効果
本発明の電子写真複写機用現像ロールは、その表面に設
けられた樹脂層が、上記の様に結着樹脂中に所定の量の
カーボンブラック微粉末および金属酸化物粉末を分散さ
せてなるから、その樹脂層は、１０’〜｛０１２Ω（自
）の範囲で、そのバラツキが０．５桁以内の極めて均一
な体積抵抗率を有するものとなる。したがって、本発明
の電子写真複写機用現像ロールを用いて電子写真複写を
行った場合、優れた画質の画像を得ることが可能になる
。Effects of the Invention In the developing roll for an electrophotographic copying machine of the present invention, the resin layer provided on its surface has a predetermined amount of fine carbon black powder and metal oxide powder dispersed in the binder resin as described above. Therefore, the resin layer has an extremely uniform volume resistivity in the range of 10' to {012 Ω (auto), with variations within 0.5 digits. Therefore, when electrophotographic copying is performed using the developing roll for electrophotographic copying machines of the present invention, it is possible to obtain images of excellent image quality.
である。It is.
ｌ・・・ドラム状の感光体、２・・・現像機箱体、３・
・・樹脂層、４・・・現像ロール芯金、５・・・トナー
溜り、６・・・トナー粒子、７・・・層規制部材、３ｌ
・・・金属酸化物粒子、３２・・・カーボンブラック粒
子、３３・・・結着樹脂。l...Drum-shaped photoreceptor, 2...Developing machine box body, 3...
... Resin layer, 4... Developing roll core bar, 5... Toner reservoir, 6... Toner particles, 7... Layer regulating member, 3l
...Metal oxide particles, 32...Carbon black particles, 33...Binder resin.
Claims (1)
ーボンブラック微粉末と５０〜２３０重量部の金属酸化
物粉末とを分散してなる体積抵抗率が１０＾９〜１０＾
１＾２Ωｃｍの樹脂層を表面に設けてなることを特徴と
する電子写真複写機用現像ロール。(1) The volume resistivity obtained by dispersing 10 to 35 parts by weight of carbon black fine powder and 50 to 230 parts by weight of metal oxide powder in 100 parts by weight of binder resin is 10^9 to 10^
A developing roll for an electrophotographic copying machine, characterized in that a resin layer of 1^2 Ωcm is provided on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1154470A JPH0320763A (en) | 1989-06-19 | 1989-06-19 | Developing roll of electrophotographic copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1154470A JPH0320763A (en) | 1989-06-19 | 1989-06-19 | Developing roll of electrophotographic copying machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0320763A true JPH0320763A (en) | 1991-01-29 |
Family
ID=15584954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1154470A Pending JPH0320763A (en) | 1989-06-19 | 1989-06-19 | Developing roll of electrophotographic copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0320763A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610695A (en) * | 1994-09-09 | 1997-03-11 | Oki Electric Industry Co., Ltd. | Roller for electrophotographic development apparatus |
| US20110158705A1 (en) * | 2009-12-29 | 2011-06-30 | Samsung Electronics Co., Ltd. | Toner supply roller for electrophotographic imaging apparatus and method of preparing the same |
-
1989
- 1989-06-19 JP JP1154470A patent/JPH0320763A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610695A (en) * | 1994-09-09 | 1997-03-11 | Oki Electric Industry Co., Ltd. | Roller for electrophotographic development apparatus |
| US20110158705A1 (en) * | 2009-12-29 | 2011-06-30 | Samsung Electronics Co., Ltd. | Toner supply roller for electrophotographic imaging apparatus and method of preparing the same |
| US8515321B2 (en) * | 2009-12-29 | 2013-08-20 | Samsung Electronics Co., Ltd. | Toner supply roller for electrophotographic imaging apparatus and method of preparing the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH03100561A (en) | Toner for electrophotography | |
| JPH0320763A (en) | Developing roll of electrophotographic copying machine | |
| EP1515197B1 (en) | Coated conductive carriers | |
| JP3802311B2 (en) | Magnetic toner | |
| KR900005259B1 (en) | Magnetic brush developer for electrophotography | |
| US5168027A (en) | Carrier of developer, process for preparation thereof, and developing method using same | |
| US4873540A (en) | Image recording method | |
| US4482623A (en) | Preparation method of magnetic toner | |
| US4803142A (en) | Containing magnetic particles having a bulk resistivity of at most 1045 -1012 ohm.cm | |
| EP0057613A1 (en) | Method for making magnetic toner | |
| JPH024281A (en) | Magnetic carrier | |
| JPH01146957A (en) | Semiconductive resin composition | |
| JP2995949B2 (en) | Electrophotographic developer | |
| JP3336795B2 (en) | Carrier for electrophotographic developer | |
| JP3206089B2 (en) | Conductive paint composition | |
| JP2590962B2 (en) | Carrier for developing electrostatic images | |
| JPS59127054A (en) | Electrophotographic developing agent | |
| JP3211605B2 (en) | Carrier for developing electrostatic latent images | |
| US20080153026A1 (en) | Graphite containing carriers | |
| JPS5895748A (en) | Transfer type magnetic toner particle | |
| JP2533007B2 (en) | Toner for electrostatic charge development | |
| JPH04133077A (en) | Semiconductive resin composite material and developing roll for electrophotographic copying machine using it | |
| JPS59170849A (en) | magnetic color developer | |
| JPS6033264B2 (en) | Toner for electrophotography | |
| JP4241119B2 (en) | Electrostatic latent image developer carrier, electrostatic latent image developer and image forming method |