JPS59111156A - Electrophotographic ferrite carrier - Google Patents
Electrophotographic ferrite carrierInfo
- Publication number
- JPS59111156A JPS59111156A JP57219583A JP21958382A JPS59111156A JP S59111156 A JPS59111156 A JP S59111156A JP 57219583 A JP57219583 A JP 57219583A JP 21958382 A JP21958382 A JP 21958382A JP S59111156 A JPS59111156 A JP S59111156A
- Authority
- JP
- Japan
- Prior art keywords
- ferrite
- ferrite carrier
- carrier
- electrophotography
- metal
- 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
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/108—Ferrite carrier, e.g. magnetite
- G03G9/1085—Ferrite carrier, e.g. magnetite with non-ferrous metal oxide, e.g. MgO-Fe2O3
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/107—Developers with toner particles characterised by carrier particles having magnetic components
- G03G9/1075—Structural characteristics of the carrier particles, e.g. shape or crystallographic structure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Developing Agents For Electrophotography (AREA)
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、電子写真用トナーキャリヤーに関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electrophotographic toner carriers.
電子写真の現像法としては、カスケード現像法、磁気ブ
ラシ現像法、その他の方法が知られているが、これら現
像法に使用されるトナーキャリアーとして要求される特
性は、適当な摩擦帯電性を持ちトナー粒子を吸引するこ
と、緻密であり粒子の強度が十分で破壊を生じないこと
、粒子が流動性に富むこと、粒子が均一であること、表
面の状態が湿度等によって変らず種々の特性が安定して
いること、引張り・圧縮強度等を有すること、また適切
な飽和磁化し、透磁率あるいは保磁力を有すること等で
ある。Cascade development, magnetic brush development, and other methods are known as electrophotographic development methods, but the characteristics required for the toner carrier used in these development methods are appropriate triboelectric charging properties. The toner particles must be suctioned, the particles must be dense and have sufficient strength so that they do not break, the particles must have high fluidity, the particles must be uniform, and the surface condition does not change due to humidity etc. and has various characteristics. It must be stable, have tensile/compressive strength, etc., and have appropriate saturation magnetization, magnetic permeability, or coercive force.
従来よりトナーキャリアー粒子として種々の材料が使用
されてきているが、最も多く用いられているものとして
鉄粉がある。これは鉄粉の表面を適当な処理をして使用
しているものであるが、長時間使用すると粒子の表面が
物理的あるいは化学的に変化し、トナーが付着してしま
ったり、あるいは使用環境の湿度に敏感になって画像の
鮮明度がうすれたりするため寿命が短いという欠点があ
る。また、トナーキャリアーとして酸化物磁性材料であ
るフェライトを用いることも知られているが（例えば、
特開昭５２−５６５３６号公報等）従来の電子写真用フ
ェライトキャリアーは画像特性あるいは寿命の点で必ず
しも満足しうるものではない。Although various materials have been used as toner carrier particles, iron powder is the most commonly used material. This is made by appropriately treating the surface of iron powder, but when used for a long time, the surface of the particles changes physically or chemically, causing toner to adhere to it, or due to the environment in which it is used. The disadvantage is that the service life is short because the image becomes sensitive to humidity and the sharpness of the image fades. It is also known to use ferrite, which is an oxide magnetic material, as a toner carrier (for example,
Conventional ferrite carriers for electrophotography are not necessarily satisfactory in terms of image characteristics or lifespan.
本発明はこれら従来の電子写真用トナーキトリアーの欠
点をなくし、画像特性の優れた、また寿命の長い新規な
構成の電子写真用フェライト・キャリアーを提供するこ
とを目的とするものである。It is an object of the present invention to eliminate these drawbacks of conventional electrophotographic toner carriers and to provide a ferrite carrier for electrophotography having a novel structure that has excellent image characteristics and a long life.
上記目的を達成するために本発明は、Ｍｅ３Ｆｅ５Ｏ１
２の構造を示すフェライトのＭｅを１価または２価の金
属のうちの１種または２種以上で置換した組成、からな
り、電気抵抗率１０３Ωｃｍ以上で飽和磁化値が１０ｅ
ｍｕ／ｇ以上の特性を有し、平均粒径が１０〜１０００
μｍであることを特徴とするものである。In order to achieve the above object, the present invention provides Me3Fe5O1
It consists of a composition in which Me of ferrite showing structure 2 is replaced with one or more types of monovalent or divalent metals, and has an electrical resistivity of 103 Ωcm or more and a saturation magnetization value of 10e.
It has the characteristics of mu/g or more, and the average particle size is 10 to 1000.
It is characterized by being μm.
本発明において、上記フェライトキャリアーの電気抵抗
率は特に１０３Ωｃｍ以上が良く、本範囲内とすること
により摩擦帯電量を適当な値に制御し易くなり、また湿
度等の影響は受けにくくなるため、目的とする鮮明な画
像を得ることが容易である。また、飽和磁化の値は１０
ｅｍｕ／ｇ以上が適切でこの値より小さい場合には磁気
ロールとの吸着力は落ち、目標とする鮮明な画像を得る
ことが難かしくなる。また、上記フェライトの保磁力Ｈ
ｃが１００Ｏｅ以上では、粒子そのものが磁石の性質を
もち種々の部品に付着し易くなるため良い画像は得られ
ない。また、透磁率μが１０未満では磁気ロールへの反
応が悪くなり画質に影響を与える。In the present invention, the electrical resistivity of the ferrite carrier is particularly preferably 103 Ωcm or more, and by keeping it within this range, it becomes easier to control the amount of triboelectric charge to an appropriate value, and it is less susceptible to the effects of humidity, etc. It is easy to obtain clear images. Also, the value of saturation magnetization is 10
Emu/g or more is appropriate; if it is smaller than this value, the adhesion force with the magnetic roll decreases, making it difficult to obtain the desired clear image. In addition, the coercive force H of the above ferrite
If c is 100 Oe or more, the particles themselves have magnetic properties and tend to adhere to various parts, making it impossible to obtain good images. Furthermore, if the magnetic permeability μ is less than 10, the response to the magnetic roll will be poor and the image quality will be affected.
以下、本発明を実施例によって詳細に説明する。Hereinafter, the present invention will be explained in detail with reference to Examples.
実施例１
モル比で、Ｙ２Ｏ３４０％、Ｆｅ２Ｏ３６０％となるよ
うに秤量し混合した。混合機としてはボールミル、振動
ミル、ミキサー等を用いた。混合粉は８００〜１２００
℃で仮焼した。仮焼した試料はボールミル、振動ミル、
アトライター等の粉砕機を用い粉砕した。粉砕後の粒径
は、空気透過法を用い測定した結果、平均粒径で０．３
〜２．０μｍであった。次いで、粉砕した試料を、バイ
ンダーとしてＰ．Ｖ．Ａ（ポリビニルアルコール）の水
溶液（Ｐ．Ｖ．Ａの量としては、０．０５〜５．０ｗｔ
％）を使用し、スプレードライヤー、ニーダー、ミキザ
ー等の造粒器を用い造粒した。Example 1 They were weighed and mixed so that the molar ratio was 40% Y2O3 and 60% Fe2O3. As a mixer, a ball mill, a vibration mill, a mixer, etc. were used. Mixed powder is 800-1200
It was calcined at ℃. Calcined samples can be processed using ball mills, vibration mills,
It was pulverized using a pulverizer such as Attritor. The particle size after pulverization was measured using an air permeation method, and the average particle size was 0.3.
It was ~2.0 μm. The crushed sample was then treated with P.I. as a binder. V. An aqueous solution of A (polyvinyl alcohol) (the amount of P.V.A is 0.05 to 5.0 wt
%) and granulated using a granulator such as a spray dryer, kneader, or mixer.
次に造粒紛を１１００〜１４００℃で焼成した。焼成方
法としてはアルミナ等の容器に迄粒粉を入れて焼成して
も良いが、多量に容器に入れて焼成する場合には焼成の
際に粒成長し、粒同士が接合する場合があるため、本実
施例ではロータリーキルン等で試料を回転しながら焼成
した。得られた粉末を組成分析した結果、組成はほぼ目
標とするものであることがわかった。Next, the granulated powder was fired at 1100 to 1400°C. As for the firing method, it is possible to put granules in a container such as alumina and fire them, but if you put a large amount of powder in a container and fire it, the grains may grow during firing and the grains may join together. In this example, the sample was fired while rotating in a rotary kiln or the like. As a result of compositional analysis of the obtained powder, it was found that the composition was almost as desired.
このようにして得られたフェライトの諸特性を第１表に
示す。Table 1 shows various properties of the ferrite thus obtained.
この球状フェライトをトナーキャリアーとして使用し電
子複写した結果、従来の鉄粉キャリアーでは約１０，０
００枚、通常の電子写真用フェライトキャリアーでは約
５０，０００枚であったのに対し、本発明電子写真用フ
ェライトキャリアーを用いることにより７０，０００〜
１００，０００枚の鮮明なコピーが可能であった。As a result of electronic copying using this spherical ferrite as a toner carrier, the conventional iron powder carrier was approximately 10.0
00 sheets, and while it was about 50,000 sheets with a normal ferrite carrier for electrophotography, by using the ferrite carrier for electrophotography of the present invention, it was 70,000 ~
It was possible to make 100,000 clear copies.
実施例２
モル比で、Ｙ２Ｏ３３０％、Ｖ２Ｏ５５％、ＦｅＯ３６
５％となるように秤量し、実施例１と同様な処理により
、ほぼ同特性をもつ球状のフェライトを作成した。この
球状フェライトををフェライトキャリアーとしてコピー
試験した結果実施例１と同様のコピー性能を得た。Example 2 Molar ratio: Y2O330%, V2O55%, FeO36
It was weighed so that it was 5%, and processed in the same manner as in Example 1 to produce spherical ferrite having almost the same characteristics. A copying test was conducted using this spherical ferrite as a ferrite carrier, and the same copying performance as in Example 1 was obtained.
以上の如く、本発明フェライトキャリアーは従来使用さ
れている鉄粉キャリアに比べ、長寿命であることが判明
し、電子写真用の現像材料として卓越した効果を示しそ
の工業的応用価値は大である。As described above, the ferrite carrier of the present invention has been found to have a longer lifespan than conventionally used iron powder carriers, exhibiting excellent effects as a developing material for electrophotography, and has great industrial application value. .
Claims (7)
ｂ３＋、Ｔｍ３＋、Ｅｒ３＋、Ｈｏ３＋、Ｄｙ３＋、Ｔ
ｂ３＋、Ｇｄ３＋、Ｓｍ３＋などで表わされるガーネッ
ト系フェライトのＭｅを、１価または２価以上の金属の
うちの１種または２種以上で置換した組成からなり、電
気抵抗率が１０３Ω−ｃｍ以上で飽和磁化値が１０ｅｍ
ｕ／ｇ以上の特性を有し、平均粒径が１０μｍ〜１００
０μｍであることを特徴とする電子写真用フェライトキ
ャリアー。1. Me3Fe5O12 (Me=Y3+, Lu3+, Y
b3+, Tm3+, Er3+, Ho3+, Dy3+, T
It consists of a composition in which Me in garnet-based ferrite represented by b3+, Gd3+, Sm3+, etc. is replaced with one or more types of monovalent or divalent or more metals, and the electrical resistivity is saturated at 103Ω-cm or more. Magnetization value is 10em
It has the characteristics of u/g or more, and the average particle size is 10 μm to 100 μm.
A ferrite carrier for electrophotography characterized by having a particle size of 0 μm.
Ｈｅが１００Ｏｅ以下であることを特徴とする電子写真
用フェライトキャリアー。2. A ferrite carrier for electrophotography according to claim 1, characterized in that the coercive force He is 100 Oe or less.
いて、透磁率μが１０以上であることを特徴とする電子
写真用フェライトキャリアー。3. A ferrite carrier for electrophotography according to claim 1 or 2, characterized in that the magnetic permeability μ is 10 or more.
ものにおいて、キュリー温度Ｔｃが５０℃以上であるこ
とを特徴とする電子写真用フェライトキャリアー。4. A ferrite carrier for electrophotography according to claim 1, 2, or 3, characterized in that the Curie temperature Tc is 50° C. or higher.
４項記載のものにおいて、粒子の強度が１０００ｇ／ｃ
ｍ２であることを特徴とする電子写真用フェライトキャ
リアー。5. Claims 1, 2, 3, or 4, wherein the particles have a strength of 1000 g/c.
A ferrite carrier for electrophotography, characterized in that it is m2.
または第５項記載のものにおいて、粒子の表面を酸化さ
せたことを特徴とする電子写真用フェライトキャリアー
。6. Claims 1, 2, 3, 4,
Or the ferrite carrier for electrophotography according to item 5, characterized in that the surface of the particles is oxidized.
第５項、または第６項記載のものにおいて、粒子の表面
を樹脂等で被覆したことを特徴とする電子写真用フェラ
イトキャリアー。7. Claims 1, 2, 3, 4,
6. A ferrite carrier for electrophotography according to item 5 or 6, characterized in that the surface of the particles is coated with a resin or the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57219583A JPS59111156A (en) | 1982-12-15 | 1982-12-15 | Electrophotographic ferrite carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57219583A JPS59111156A (en) | 1982-12-15 | 1982-12-15 | Electrophotographic ferrite carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59111156A true JPS59111156A (en) | 1984-06-27 |
Family
ID=16737800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57219583A Pending JPS59111156A (en) | 1982-12-15 | 1982-12-15 | Electrophotographic ferrite carrier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59111156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01276150A (en) * | 1988-04-28 | 1989-11-06 | Canon Inc | Coated carrier for electrophotography |
-
1982
- 1982-12-15 JP JP57219583A patent/JPS59111156A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01276150A (en) * | 1988-04-28 | 1989-11-06 | Canon Inc | Coated carrier for electrophotography |
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