JP2647246B2 - Developing roller - Google Patents
Developing rollerInfo
- Publication number
- JP2647246B2 JP2647246B2 JP2263052A JP26305290A JP2647246B2 JP 2647246 B2 JP2647246 B2 JP 2647246B2 JP 2263052 A JP2263052 A JP 2263052A JP 26305290 A JP26305290 A JP 26305290A JP 2647246 B2 JP2647246 B2 JP 2647246B2
- Authority
- JP
- Japan
- Prior art keywords
- developing roller
- silicone rubber
- conductivity
- rubber
- elastic material
- 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.)
- Expired - Lifetime
Links
- 229920002379 silicone rubber Polymers 0.000 claims description 21
- 239000004945 silicone rubber Substances 0.000 claims description 21
- 239000013013 elastic material Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 239000006229 carbon black Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 4
- 239000004205 dimethyl polysiloxane Substances 0.000 description 3
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- -1 trimethylsiloxy groups Chemical group 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910021485 fumed silica Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000012974 tin catalyst Substances 0.000 description 1
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Dry Development In Electrophotography (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、特に一成分非磁性体方式を採用する現像装
置に好適な現像ローラに関するものである。Description: TECHNICAL FIELD The present invention relates to a developing roller particularly suitable for a developing device employing a one-component non-magnetic material system.
（従来の技術） 一般に、一成分非磁性方式を採用する現像装置に用い
る現像ローラにおいては、現像ローラの弾性体材料とし
てゴムが用いられる。(Prior Art) Generally, in a developing roller used in a developing device employing a one-component non-magnetic system, rubber is used as an elastic material of the developing roller.
かかるゴムとして、ウレタンゴム,NBRゴム,EPDMゴム
等各種ゴム材料から適切に選択される。Such rubber is appropriately selected from various rubber materials such as urethane rubber, NBR rubber, and EPDM rubber.
上記現像ローラは、現像装置において知られるトナー
規制ブレードとともに使用するトナーに適切な帯電量を
付与する役割をもっている。The developing roller has a role of giving an appropriate charge amount to the toner used together with the toner regulating blade known in the developing device.
また、所謂現像バイアスを適切に確保し、静電潜像を
乱さないために、現像ローラには、そのシャフトとゴム
表面間で適切な抵抗値を有する必要がある。Further, in order to properly secure a so-called developing bias and not to disturb the electrostatic latent image, the developing roller needs to have an appropriate resistance value between the shaft and the rubber surface.
これらの諸条件を満足させるために、使用される弾性
材料には、生ゴム，導電性付与剤，各種の充填剤等を最
も適切に選択し、かつそれらの配合組成を好適に保つよ
うな配慮がなされている。In order to satisfy these conditions, the elastic material to be used should be most appropriately selected from raw rubber, a conductivity-imparting agent, various fillers, and the like, and should be designed so that the composition thereof is maintained appropriately. It has been done.
（発明が解決しようとする課題） しかしながら、上述の弾性材料による現像ローラを用
いた現像装置において、従来用いられていた現像ローラ
には、以下に述べるような問題点が免がれなかった。(Problems to be Solved by the Invention) However, in the developing device using the above-described developing roller made of an elastic material, the developing roller conventionally used has been inevitably subject to the following problems.
弾性材料を用いた現像ローラを用いる現像装置では、
該現像ローラは、感光体に接触した状態でその機能を果
たすため、感光体上の静電潜像の乱れを生じさせたり、
画像の流れを生じさせるなどの不都合がないよう、前記
弾性材料にある値以上の電気抵抗を持たせる必要があ
る。In a developing device using a developing roller using an elastic material,
The developing roller performs its function when in contact with the photoconductor, causing disturbance of the electrostatic latent image on the photoconductor,
The elastic material needs to have an electric resistance of a certain value or more so as not to cause inconvenience such as causing a flow of an image.
一方、充分量のトナーを感光体に供給するためには、
現像ローラの弾性材料の電気抵抗がある値以下に抑えら
れなければならない。On the other hand, in order to supply a sufficient amount of toner to the photoconductor,
The electric resistance of the elastic material of the developing roller must be kept below a certain value.
以上のような理由から、現像ローラの電気抵抗値は、
一般に芯金とローラ表面間で、１×103〜１×105Ω・m2
の範囲に収める必要がある。For the above reasons, the electric resistance value of the developing roller is
Generally, between the core metal and the roller surface, 1 × 10 3 to 1 × 10 5 Ω · m 2
Must be within the range.
そして、かかる電気抵抗値の調節には、一般にカーボ
ンブラックが用いられるが、先に述べたような中間的な
領域では、弾性材料中に含有されるカーボンブラック量
の僅かな変化が抵抗値に大きな変化をもたらしてしまう
ことが多い。In general, carbon black is used for the adjustment of the electric resistance value. In the intermediate region as described above, a slight change in the amount of carbon black contained in the elastic material is large in the resistance value. It often makes a difference.
即ち、希望する電気抵抗値を有する現像ローラを安定
的に供給することは容易ではなく、歩留りを向上させる
ことがむづかしいという問題点があった。That is, it is not easy to stably supply a developing roller having a desired electric resistance value, and it is difficult to improve the yield.
かかる問題点を解決すべく、カーボンブラック含有の
架橋済シリコーンゴム粉砕品を配合してなるシリコーン
ゴムを弾性材料として用いた現像ローラも有用である
が、この現像ローラは、ゴムの粉砕、及び分級が必要と
なる等製造作業性、及びコストの面で難点があった。In order to solve such a problem, a developing roller using silicone rubber as an elastic material, which is obtained by blending a crushed product of crosslinked silicone rubber containing carbon black, is also useful. However, this developing roller is used for grinding and classifying rubber. However, there are difficulties in terms of manufacturing workability and cost.
本発明は、高品質の印刷を可能とするために必要な安
定した電気抵抗値を有する現像ローラを、低コストでか
つ安定して供給することができるようにすることを目的
とするものである。SUMMARY OF THE INVENTION It is an object of the present invention to stably supply a developing roller having a stable electric resistance value necessary for enabling high-quality printing at low cost. .
（課題を解決するための手段） 本発明は、第１の導電率を有するシリコーンゴム粒状
物を第１の導電率とは異なる第２の導電率を有するシリ
コーンゴムに含有させてなるシリコーンゴムを弾性材料
として用いたことを特徴とする現像ローラを得ることに
ある。(Means for Solving the Problems) The present invention provides a silicone rubber obtained by adding a silicone rubber particulate having a first conductivity to a silicone rubber having a second conductivity different from the first conductivity. An object of the present invention is to provide a developing roller characterized in that it is used as an elastic material.
（作用） 本発明においては、第１の導電率を有するシリコーン
ゴム粒状物を第１の導電率とは異なる第２の導電率を有
するシリコーンゴムに含有させてなるシリコーンゴムを
弾性材料として現像ローラを構成したものである。(Function) In the present invention, the developing roller is formed by using a silicone rubber obtained by adding a silicone rubber particulate having a first conductivity to a silicone rubber having a second conductivity different from the first conductivity as an elastic material. It is what constituted.
（実施例） 実施例１〜９ 以下実施例によりこの発明を具体的に説明する。(Examples) Examples 1 to 9 Hereinafter, the present invention will be described specifically with reference to examples.
導電性シリコーンゴム粒状物の製造例 分子鎖両末端がヒドロキシル基で封鎖された粘度100
センチポイズのジメチルポリシロキサン（ヒドロキシル
基含有量1.3％）100部、表面積70m2/gのカーボンブラッ
ク（電気化学（株））20部、及び分子鎖両末端がトリメ
チルシロキシ基で封鎖された粘度10センチポイズメチル
ハイドロジェンポリシロキサン（ケイ素原子結合水素原
子含有量1.5％）12部、を均一に混合した（混合物
Ａ）。Production example of conductive silicone rubber granules Viscosity 100 with both molecular chains terminated with hydroxyl groups
100 parts of centipoise dimethylpolysiloxane (hydroxyl group content: 1.3%), 20 parts of carbon black (Electrochemical Co., Ltd.) having a surface area of 70 m 2 / g, and a viscosity of 10 centipoise in which both ends of the molecular chain are blocked with trimethylsiloxy groups 12 parts of methylhydrogenpolysiloxane (silicon-bonded hydrogen atom content: 1.5%) were uniformly mixed (mixture A).
次に上記と同じジメチルポリシロキサン100部に、上
記と同じカーボンブラック20部を加えて混合した後、ス
ズ触媒（錫オクトエート）1.5部を加え３本ロールを使
用して混練した（混合物Ｂ）。Next, 20 parts of the same carbon black as above was added to and mixed with 100 parts of the same dimethylpolysiloxane, and then 1.5 parts of a tin catalyst (tin octoate) was added and kneaded using a three-roll mill (mixture B).
上記混合物Ａ及びＢを、各々重量比が１対１になるよ
うに計量し、これをギヤーポンプを使用しスタチックミ
キサー（特殊機化（株）製10エレメント）に送液し、均
一に混合した（混合物Ｃ）。The mixtures A and B were weighed so that the weight ratio was 1: 1 respectively, and the mixture was sent to a static mixer (10 elements manufactured by Tokushu Kika Co., Ltd.) using a gear pump and mixed uniformly. (Mixture C).
得られた混合物をコロイドミル（マントンゴーリ社
製）に送り込み、同時にイオン交換水1200部、及び界面
活性剤（トリメチルノチェールのエチレンオキサイド付
加物，ユニオンカーバイトコーポレーション製，非イオ
ン界面活性剤タジトールTMN−６）５部を加え、1,400r.
p.m.で回転させ導電性シリコーンゴム組成物の水分散液
を得た。The obtained mixture is fed into a colloid mill (mantongoli), and at the same time, 1200 parts of ion-exchanged water and a surfactant (trimethylnochel ethylene oxide adduct, manufactured by Union Carbide Corporation, nonionic surfactant Taditol TMN) -6) Add 5 parts and add 1,400r.
The dispersion was rotated at pm to obtain an aqueous dispersion of the conductive silicone rubber composition.
このようにして得た導電性シリコーンゴム組成物の水
分散液を、室温にて３時間放置した後、スプレードライ
ヤー（アジサワ，ニロ，アトマイザー（株）製）を使用
し、入口温度300℃，出口温度110℃のドライヤー中に噴
霧させ硬化を完結させたところ、平均粒径20μｍの球状
のゴム粒状物が得られた。The aqueous dispersion of the conductive silicone rubber composition thus obtained was allowed to stand at room temperature for 3 hours, and then, using a spray dryer (Ajisawa, Niro, manufactured by Atomizer Co., Ltd.), the inlet temperature was 300 ° C., and the outlet was Spraying was performed in a dryer at a temperature of 110 ° C. to complete the curing, and spherical rubber particles having an average particle diameter of 20 μm were obtained.
現像ローラ用ゴムストックの製造例 分子鎖両末端鎖がジメチルビニルシロキシ基で封鎖さ
れたジメチルポリシロキサン生ゴム100部と、ヒューム
ドシリカ20部とを均一に混合し、シリコーンゴムストッ
クを調整した。Production Example of Rubber Stock for Developing Roller 100 parts of dimethylpolysiloxane raw rubber in which both terminal chains of molecular chains were blocked with dimethylvinylsiloxy groups and 20 parts of fumed silica were uniformly mixed to prepare a silicone rubber stock.
次にこのシリコーンゴムストック100部に対し、上記
で得た導電性シリコーンゴム粒状物を表１に示す割合で
配合し、ジ−ｔ−ブチル−パーオキサイド0.5部を配合
し均一に混練した。Next, the conductive silicone rubber granules obtained above were blended with 100 parts of this silicone rubber stock at the ratio shown in Table 1, and 0.5 part of di-t-butyl-peroxide was blended and uniformly kneaded.
得られた混練物を板状品に成形し、この成形品を金属
シャフトをはさんで型にはめ込み、170℃,200kg/cm2で1
0分間プレス加硫をした後、200℃で６時間２次加硫し現
像ローラを得た。The resulting kneaded product was molded into a plate product, it fitted the molded article in a mold across the metal shaft, 170 ° C., 1 at 200 kg / cm 2
After press vulcanization for 0 minutes, secondary vulcanization was performed at 200 ° C. for 6 hours to obtain a developing roller.
そしてこれらの現像ローラの抵抗を測定した。尚この
測定は、現像ローラゴム表面と芯金シャフト間の10ヵ所
で行ない、体積抵抗率のバラツキ範囲を求め結果を下表
１に示した。And the resistance of these developing rollers was measured. This measurement was performed at 10 points between the surface of the developing roller rubber and the core metal shaft, and the variation range of the volume resistivity was determined. The results are shown in Table 1 below.
比較例１〜９ 比較のために、上記実施例で使用したシリコーンゴム
ストックに、実施例で使用したカーボンブラックを下表
１と同じ含有量となるように配合し実施例と同一条件
で、現像ローラを製造した。得られた現像ローラについ
て実施例と同一条件で体積固有抵抗率を求め、そのバラ
ツキの範囲を下表２に示した。Comparative Examples 1 to 9 For comparison, the silicone rubber stock used in the above example was blended with the carbon black used in the example so as to have the same content as in Table 1 below, and developed under the same conditions as in the example. Rollers were manufactured. The specific volume resistivity of the obtained developing roller was determined under the same conditions as in the example, and the range of the variation is shown in Table 2 below.
表１及び表２の結果で明らかなように、比較例は、上
述の抵抗バラツキが５倍〜10倍程度になっていた。As is clear from the results of Tables 1 and 2, in the comparative example, the above-described resistance variation was about 5 to 10 times.
（発明の効果） 本発明は以上の説明、及び実施例の結果から明らかな
ように、第１の導電率を有するシリコーンゴム粒状物を
第１の導電率とは異なる第２の導電率を有するシリコー
ンゴムに含有させ、この導電率の差を利用し、現像ロー
ラに求められる中間的な領域になるよう、電気抵抗値の
調節ができるので、現像ローラの抵抗値を著しく安定化
させ得るものであり、希望する電気抵抗値を有する現像
ローラを安定的に供給し、歩留まりを向上させ得るもの
である。 (Effects of the Invention) As is clear from the above description and the results of the examples, the present invention provides a silicone rubber granule having a first conductivity with a second conductivity different from the first conductivity. The electrical resistance value can be adjusted to be in the intermediate region required for the developing roller by making use of the difference in the electrical conductivity by containing it in silicone rubber, so that the resistance value of the developing roller can be remarkably stabilized. In addition, a developing roller having a desired electric resistance value can be supplied stably, and the yield can be improved.
さらに、第１の導電率を有するシリコーンゴム粒状物
や第１の導電率とは異なる第２の導電率を有するシリコ
ーンゴムは、金属粉末などとは異なる軟らかな物質であ
り、弾性材料として現像ローラを構成すると、感光体に
接触した状態でも、その表面を傷つけたり、削り取った
りするようなことはない。Further, the silicone rubber particles having the first conductivity and the silicone rubber having the second conductivity different from the first conductivity are soft substances different from metal powder and the like. With this configuration, even when the photosensitive member is in contact with the photosensitive member, the surface thereof is not damaged or scraped off.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 水谷 孝夫 東京都港区虎ノ門１丁目７番12号 沖電 気工業株式会社内 (72)発明者 石原 徹 東京都港区虎ノ門１丁目７番12号 沖電 気工業株式会社内 (56)参考文献 特開 平２−18578（ＪＰ，Ａ) 特開 平１−124881（ＪＰ，Ａ) 特開 平４−88376（ＪＰ，Ａ) ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takao Mizutani 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Tohru Ishihara 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (56) References JP-A-2-18578 (JP, A) JP-A-1-124,881 (JP, A) JP-A-4-88376 (JP, A)
Claims (1)
電率とは異なる第２の導電率を有するシリコーンゴムに
含有させてなるシリコーンゴムを弾性材料として用いた
ことを特徴とする 現像ローラ。1. A developing roller using an elastic material, wherein a silicone rubber particle having a first conductivity is contained in a silicone rubber having a second conductivity different from the first conductivity. Developing roller characterized by using as an elastic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263052A JP2647246B2 (en) | 1990-10-02 | 1990-10-02 | Developing roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2263052A JP2647246B2 (en) | 1990-10-02 | 1990-10-02 | Developing roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04140772A JPH04140772A (en) | 1992-05-14 |
| JP2647246B2 true JP2647246B2 (en) | 1997-08-27 |
Family
ID=17384190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2263052A Expired - Lifetime JP2647246B2 (en) | 1990-10-02 | 1990-10-02 | Developing roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2647246B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2646953B2 (en) * | 1993-01-25 | 1997-08-27 | 信越化学工業株式会社 | Semiconductive roll |
| JP4903008B2 (en) * | 2006-04-21 | 2012-03-21 | グンゼ株式会社 | Semiconductive tubular film used in image forming apparatus and method for producing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01124881A (en) * | 1987-11-09 | 1989-05-17 | Ricoh Co Ltd | Developing member for electrostatic latent images |
| JP2595317B2 (en) * | 1988-07-06 | 1997-04-02 | 東海ゴム工業株式会社 | Conductive roll |
| JP2959639B2 (en) * | 1990-08-01 | 1999-10-06 | 株式会社リコー | Method for manufacturing developer carrier |
-
1990
- 1990-10-02 JP JP2263052A patent/JP2647246B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04140772A (en) | 1992-05-14 |
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