JPS60227266A - Ferrite carrier material for electrostatic copying - Google Patents
Ferrite carrier material for electrostatic copyingInfo
- Publication number
- JPS60227266A JPS60227266A JP59083538A JP8353884A JPS60227266A JP S60227266 A JPS60227266 A JP S60227266A JP 59083538 A JP59083538 A JP 59083538A JP 8353884 A JP8353884 A JP 8353884A JP S60227266 A JPS60227266 A JP S60227266A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- ferrite
- carrier material
- mol
- oxides
- 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
Abstract
Description
【発明の詳細な説明】
し産業上の利用分野］
本発明は、２成分系電子複写機用現像剤に片いられるキ
ャリア材料に関し、更に詳しくは、マグネシウム−亜鉛
系フェライト材料を主成りとし、それに周期律表の■族
元素の一部の酸イ【物 ｆλ ネ ＪＩＪシ ノイ １
す９本日 濤 ｉλ 宥 １ 志 面 乎１（暑ｉ
ζ、偽）マ耐久性および画像特性のすぐれた球状の静電
複写用フェライトキャリア材に関するものである。[Detailed Description of the Invention] Industrial Application Field] The present invention relates to a carrier material used in a two-component developer for electronic copying machines, and more specifically, a carrier material mainly composed of a magnesium-zinc ferrite material, In addition, some of the acids in group ■ elements of the periodic table
9 today 濤 iλ 奥 1
This invention relates to a spherical ferrite carrier material for electrostatic copying that has excellent durability and image characteristics.
［従来の技術］
電子写真の現像法の一つとして乾式２成分現像法があり
、現在量も広く利用されているのは、そのうちの磁気ブ
ラシ現像法と呼ばれるものである。この種の２成分系現
像剤のキャリア材料に必要な諸特性としては、摩擦帯電
性、磁気特性、流動性、耐久性等があり、これら諸特性
については様々な面から検討が試みられている。[Prior Art] One of the developing methods for electrophotography is a dry two-component developing method, and among these, the one called the magnetic brush developing method is currently widely used. The various properties necessary for carrier materials for this type of two-component developer include triboelectricity, magnetic properties, fluidity, and durability, and studies have been attempted on these properties from various aspects. .
２成分系キャリア材料として現在量（利用されているの
が）エライトキャリア材である。フェライトは周知のと
おり金属酸化物であるため、鉄粉キャリア等に比べて見
掛は密度が小さく現像剤として軽量化が可能であるし、
更に鉄粉に比べ磁気特性上、残留磁束密度が低く、また
抗磁力も小さく結果的にヒステリシスループの面積が小
さい特徴を有し、磁化反転および磁化履歴に対して常に
初期特性を保持しうる特徴を有する。またフェライトは
酸化物であるため化学的に安定であり高速現像や多数枚
複写による現像剤表面汚染等の画像劣化に対し強（、メ
ンテナンスフリーというメリットを有し、キャリアに適
している。その上、組成を変えることによってフェライ
トの半導体的性質により電気抵抗値を１０４〜１０１２
Ω−ｃｍ程度の範囲で自由に可変でき、帯電量制御によ
り画像特性を著しく向上させることができる。この様な
優れた特性を有するが故に、フェライトキャリア材は現
在の電子複写機における現像剤として必要欠くへからざ
る物質となっている。Currently available two-component carrier materials are elite carrier materials. As is well known, ferrite is a metal oxide, so it has a smaller apparent density than iron powder carriers and can be used as a lightweight developer.
Furthermore, compared to iron powder, it has a lower residual magnetic flux density and a smaller coercive force, resulting in a smaller hysteresis loop area, and can always maintain its initial characteristics against magnetization reversal and magnetization history. has. In addition, since ferrite is an oxide, it is chemically stable and resistant to image deterioration such as developer surface contamination caused by high-speed development and multiple copying (and has the advantage of being maintenance-free, making it suitable as a carrier. By changing the composition, the electrical resistance value can be increased from 104 to 1012 due to the semiconducting properties of ferrite.
It can be freely varied within a range of approximately Ω-cm, and image characteristics can be significantly improved by controlling the amount of charge. Because of these excellent properties, ferrite carrier materials have become an indispensable material as a developer in modern electronic copying machines.
し発明が解決しようとする問題点］
しかしながら、従来のこの種フェライトキャリア材には
次のような欠点があり、未だ改善の余地が残されていた
。それはキャリア粒子表面が粗く不規則であり、粒子相
互の機械的あるいは衝撃的接触により結晶体の剥離ある
いは破壊現象が生じ、それにより生成したフェライト微
粒子が、静電現像によって感光体表面へ付着し、複写紙
面を汚染したりあるいは感光体自体を損耗するというこ
とである。Problems to be Solved by the Invention] However, conventional ferrite carrier materials of this type have the following drawbacks, and there is still room for improvement. The surface of the carrier particles is rough and irregular, and mechanical or impact contact between the particles causes peeling or destruction of the crystal, and the resulting fine ferrite particles adhere to the surface of the photoreceptor through electrostatic development. This means that the surface of the copy paper may be contaminated or the photoreceptor itself may be damaged.
本発明の目的は、上記のような従来のフェライトキャリ
ア材料のもつ欠点を解消し、キャリア表面の平滑性を格
段と向上させ、安定かつ良好な静電複写性能を発揮させ
ることができるようにした経済的なフェライトキャリア
材料を提供することにある。The purpose of the present invention is to eliminate the above-mentioned drawbacks of conventional ferrite carrier materials, significantly improve the smoothness of the carrier surface, and make it possible to exhibit stable and good electrostatic copying performance. The object of the present invention is to provide an economical ferrite carrier material.
［問題点を解決するための手段］
このような目的を達成することのできる本発明は、組成
的には、Ｆｅ２Ｏ３４５〜６５モル％。[Means for Solving the Problems] The present invention, which can achieve such objects, has a composition of Fe2O3 of 45 to 65 mol%.
Ｍｇ０２６〜３２モル％、 ＺｎＯ１８〜２２モル％お
よび場合によっては５モル％以下のＭｎＯを含むマグネ
シウム−亜鉛系フェライト材を主成分とし、それに対し
て周期律表の■族元素のうちＣｒ、Ｍｏ、Ｗの１種もし
くは２種以上の酸化物を０．０３〜５重量％含有した組
成を有するものであり、形状的には微小粒径の球状をな
し、その表面が一次焼結粒子の成長促進によって非常に
滑らかな状態となっているような静電複写用フェライト
キャリア材である。The main component is a magnesium-zinc ferrite material containing 26 to 32 mol% of Mg0, 18 to 22 mol% of ZnO, and in some cases 5 mol% or less of MnO, and Cr, Mo, It has a composition containing 0.03 to 5% by weight of one or more oxides of W, and has a spherical shape with a minute particle size, whose surface promotes the growth of primary sintered particles. This is a ferrite carrier material for electrostatic copying that has a very smooth state due to the
［発明の具体的構成］ 以下、本発明について更に詳しく説明する。[Specific structure of the invention] The present invention will be explained in more detail below.
本発明は、前述の如くマグネシウム−亜鉛系フェライト
を母材とし、それに周期律表■族の元素の一部の酸化物
を適量含有した組成を有するものである。即ちまず母材
となるマグネシウム−亜鉛系フェライト材は、Ｆｅ２Ｏ
３４５〜６５モル％２Ｍｇ０２６〜３２モル％、Ｚｎ０
１８〜２２モル％を有する組成のものである。乙の組成
に５モル％以下のＭｎＯを含むようにしてもよい。そし
て本発明にかかるフェライトキャリア材は、このような
母材となるマグネシウム−亜鉛系フェライトに対して、
周期律表の■族元素のうちＣｒ、Ｍｏ、Ｗの１種もしく
は２種以上の酸化物を０．０３〜５重量％を含有した組
成を有するものである。As described above, the present invention has a composition in which a magnesium-zinc ferrite is used as a base material, and an appropriate amount of an oxide of a part of the elements of group (I) of the periodic table is contained therein. That is, first, the magnesium-zinc ferrite material that becomes the base material is Fe2O
345-65 mol% 2Mg0 26-32 mol%, Zn0
It has a composition of 18 to 22 mol%. The composition of B may include 5 mol% or less of MnO. The ferrite carrier material according to the present invention is based on magnesium-zinc ferrite, which is the base material.
It has a composition containing 0.03 to 5% by weight of oxides of one or more of Cr, Mo, and W among group (I) elements of the periodic table.
フェライトキャリア材の製造方法は従来技術とほぼ同様
であり、噴霧乾燥法（スプレードライヤー法）あるいは
流動造粒法等のような周知の球状粒子を作成する方法に
よって製造するととができる。例えば、バインダー、分
散剤、水あるいは有機溶媒等とともに前記組成のフェラ
イト微粒子をよく混合し、スラリー状にした溶液を適当
な条件で噴霧乾燥し、球状ペレットを作成する。この工
程で粉体比重を適当に制御することができるし、また空
孔の分散状態を所望の形に制御する乙とがてきる。乙の
ようにして作成した球状粒子をキルンあるいは炉で焼成
しｔコ後、篩別分級し、所望の粒度分布を有するキャリ
ア材とするのである。The method for producing the ferrite carrier material is almost the same as that in the prior art, and can be produced by a well-known method for producing spherical particles, such as a spray drying method or a fluidized granulation method. For example, fine ferrite particles having the above composition are thoroughly mixed with a binder, a dispersant, water, an organic solvent, etc., and the slurry solution is spray-dried under appropriate conditions to produce spherical pellets. In this process, the specific gravity of the powder can be appropriately controlled, and the state of dispersion of pores can be controlled in a desired form. The spherical particles prepared in the manner described above are fired in a kiln or furnace, and then classified through a sieve to obtain a carrier material having a desired particle size distribution.
本発明においてマグネシウム−亜鉛系フェライトを用い
ている理由は、従来一般に用いられているニッケルー亜
鉛系フェライトよりも安価であり、しかも静電複写用キ
ャリア材に適した抵抗値範囲に入る高抵抗材料ｔ！から
である。そして各成分の組成範囲は、通常乙の種のマグ
ネシウム−亜鉛系フェライト材料として用いられている
ものとほぼ同様であるから、個々の組成範囲についての
説明は省略する。静電複写用キャリア材として要求され
る電気抵抗率は、それを用いる複写機側の要求によって
かなり広い範囲にわたっているが、通常１０４〜１０１
２Ω〜ａｍ程度である。本発明においては、前記組成範
囲において主として酸化亜鉛の配合量を変化させろこと
によってこの電気抵抗率を適当な値に調整することがで
きる。また前述の如く、このマグネシウム−亜鉛系フェ
ライトに酸化マンガンを少量加えた構成も本発明に含ま
れる。マンガンを入れると抵抗率が高くなる傾向が生じ
、抵抗値を安定化させるとともに増量材的機能を果たさ
せることができる。The reason why magnesium-zinc ferrite is used in the present invention is that it is cheaper than the conventionally commonly used nickel-zinc ferrite, and is a high-resistance material that falls within the resistance range suitable for carrier materials for electrostatic copying. ! It is from. Since the composition range of each component is almost the same as that normally used as the magnesium-zinc ferrite material of type B, explanations of the individual composition ranges will be omitted. The electrical resistivity required for a carrier material for electrostatic copying varies over a fairly wide range depending on the requirements of the copying machine that uses it, but is usually between 104 and 101.
It is about 2Ω to am. In the present invention, the electrical resistivity can be adjusted to an appropriate value mainly by changing the amount of zinc oxide in the composition range. Further, as described above, a configuration in which a small amount of manganese oxide is added to this magnesium-zinc ferrite is also included in the present invention. When manganese is added, the resistivity tends to increase, and it can stabilize the resistance value and function as an extender.
いずれにしてもこのような組成のマグネシウム−亜鉛基
フェライト材を母材とし、それに周期律表の■族元素の
うちＣｒ、Ｍｏ、Ｗの１種もしくは２種以上の酸化物を
適量含有せしめる点に本発明の一つの大きな特徴があり
、それによって所望の特性を発現せているのである。こ
れらの材料が含有されていることにより、焼結時の結晶
成長段階において結晶粒子の濡れ性が改善され、粒成長
の促進と相俟てフェライトギヤリア材の表面の平滑性が
大幅に改善され、従来技術の欠点を著しく改善すること
ができるのである。ここでこれらＯｒ、Ｍｏ、Ｗの１種
もしくは２種以上は、単体、酸化物、水酸化物、もしく
は塩の形で添加すればよい。これらの添加物は、焼結工
程において酸化物の形で粒子中に含有されることになる
。前記添加物の量は、酸化物に換算して００３〜５重景
％の重量である。下限を０．０３重量％とじたのは、表
面の平滑性を改善するという意味から少なくともこのよ
うな数値以上の添加が必要ｔ！からである。逆に、上限
を５重量％としたのは、５重量％を超えて添加しても特
性的にはあまり極端な変化は生じないし、これらの添加
物は母材に比べて高価であるのでそれ以上添加すること
は全く無意味ｔ！からである。In any case, the point is that a magnesium-zinc-based ferrite material with such a composition is used as the base material, and that it contains an appropriate amount of oxide of one or more of Cr, Mo, and W among the group II elements of the periodic table. This is one of the major features of the present invention, which allows it to exhibit desired characteristics. The inclusion of these materials improves the wettability of crystal grains during the crystal growth stage during sintering, and together with the promotion of grain growth, the surface smoothness of the ferrite gear material is significantly improved. , the drawbacks of the prior art can be significantly improved. Here, one or more of these Or, Mo, and W may be added in the form of a simple substance, an oxide, a hydroxide, or a salt. These additives will be contained in the particles in the form of oxides during the sintering process. The amount of the additive is 0.03 to 5% by weight in terms of oxides. The reason why the lower limit is set at 0.03% by weight is that it is necessary to add at least this amount or more in order to improve the surface smoothness! It is from. On the other hand, the upper limit was set at 5% by weight because adding more than 5% by weight does not cause a very extreme change in properties, and these additives are more expensive than the base material. Adding more than that is completely pointless! It is from.
このようなキャリア材表面の平滑性については、特に電
子顕微鏡による観察によって明瞭に把握できる。これは
、多数のキャリア材を含む領域を数百倍程度の低倍率で
多数回撮影した電子顕微鏡写真をランダムに数枚抜き出
し、−室以上（例えば２０μｍ程度以上）の大きさのユ
ニツｌ゛グレン（ｕｎｉｔ ｇｒａｉｎ）をもつ球状コ
アがコア総数に対して何％存在するかを算出することに
よって大結晶化率として数値的に把握できる。これら電
子顕微鏡による観察や、それに基づく大結晶化率の算出
から、前記添加物を加えていない場合に比し、少量添加
したものは表面の粗さが大幅に改善されていることが判
る。The smoothness of the surface of the carrier material can be clearly understood especially by observation using an electron microscope. This is done by randomly extracting several electron micrographs of a region containing a large number of carrier materials taken many times at a low magnification of several hundred times, and then collecting unit grains with a size larger than 100 μm (for example, about 20 μm or larger). By calculating the percentage of spherical cores having (unit grain) relative to the total number of cores, it is possible to numerically understand the large crystallization rate. From these observations using an electron microscope and the calculation of the large crystallinity rate based on the observation, it can be seen that the surface roughness is significantly improved when a small amount of the additive is added, compared to when the additive is not added.
本発明において、キャリア材の粒径は５〜２００μｍ程
度とするのがよい。２成分系の現像剤において画像の分
解能を向上させるためにはキャリア粒子が細かいほうが
よいが、しかし細かすぎると流動性が悪くなるからであ
る。つまり、トナーと均一に混ざりあうためにはある程
度の流動性がなければならず、５μｍよりも細がすぎる
と流動性が極端に悪くなってしまうし、逆に２００μｍ
を超えて大きくなると、画像の分解能が著しく悪くなっ
てしまう。In the present invention, the particle size of the carrier material is preferably about 5 to 200 μm. In order to improve image resolution in a two-component developer, it is better for the carrier particles to be fine, but if the carrier particles are too fine, the fluidity will deteriorate. In other words, in order to mix uniformly with the toner, it must have a certain degree of fluidity, and if it is too thin than 5 μm, the fluidity will be extremely poor, and conversely, if it is too thin than 5 μm, the fluidity will be extremely poor.
If it becomes larger than , the resolution of the image will deteriorate significantly.
次に、本発明の実施例について説明する。Next, examples of the present invention will be described.
［実施例１］
Ｆｅ２Ｏ３５４１モル％、ＭｇＯ２６，８モル％、Ｚｎ
０１９３モル％なる配合割合にＣｒ２Ｏ３無添加の場合
（比較量）と０３〜５．０重量％添加した場合（本発明
品）の組成の異なる５種類の粉体を用意し、それぞれボ
ールミルで混合する。そして乾燥した後、９００℃で１
時間仮焼きし、再びボールミルで粉砕する。この溶液に
バインダーを加え、噴霧乾燥法により球状ペレットを造
粒し、得られたペレットを１２５０℃で焼成し、分級し
た後、６０〜２００μｍのフェライトキャリア材を得た
。[Example 1] Fe2O3541 mol%, MgO26.8 mol%, Zn
Five types of powders with different compositions are prepared in the case where Cr2O3 is not added (comparative amount) and when 03 to 5.0% by weight is added (product of the present invention) at a blending ratio of 0193 mol%, and each is mixed in a ball mill. . After drying, it was heated to 900℃ for 1
Calculate for an hour and grind again using a ball mill. A binder was added to this solution, spherical pellets were granulated by a spray drying method, and the obtained pellets were fired at 1250° C. and classified to obtain a ferrite carrier material of 60 to 200 μm.
第 １ 表
これら各組成のキャリア材の緒特性は、第コ表に示す通
りである。なお、ここで「大結晶化率」とは、電子顕微
鏡にて２００〜３００倍で約３０個程度のキャリアコア
を含む写真を撮影し、ユニットグレンが２０μｍ以上で
構成されるキャリアコアが全キャリアコア数の伺％存在
するかを算出したものである。Table 1 The characteristics of carrier materials of each of these compositions are shown in Table 1. Note that "large crystallization rate" here means that a photograph containing about 30 carrier cores is taken at 200 to 300 times magnification using an electron microscope, and carrier cores with unit grains of 20 μm or more are the total number of carriers. This is a calculation of whether a percentage of the number of cores exists.
前記第１表から分かるように、Ｃｒ２Ｏ５を０３重気量
添加すると、大結晶化率（ユニットグレンの大きい粒子
の存在確率）が急激に大きくなり、５重量％程度で飽和
する。なお第１表には記載していないがＣｒ２Ｏ５を０
，０３重量％添加した場合でもかなり大きな大結晶化率
が得られている。大結晶化率が増大するということは、
換言すれば粒子の平滑性が良好となるということであり
、このことは次の電子顕微鏡の影像を模写した図からも
容易に理解しうるであろう。Ｃｒ２Ｏ５無添加の場合（
第２図参照）、キャリアコアの表面には鋭く細かい凸凹
が無数に存在する。As can be seen from Table 1, when 0.3 weight percent of Cr2O5 is added, the large crystallization rate (probability of the existence of particles with large unit grains) increases rapidly and becomes saturated at about 5% by weight. Although it is not listed in Table 1, Cr2O5 is 0.
, 03% by weight, a considerably large crystallization rate was obtained. The increase in macrocrystallinity means that
In other words, the smoothness of the particles is improved, and this can be easily understood from the following figure which is a reproduction of an image taken by an electron microscope. In case of no addition of Cr2O5 (
(See Figure 2), there are countless sharp and fine irregularities on the surface of the carrier core.
これに対してＣｒ２Ｏ５を適量添加した場合には第１図
に示すように、キャリアコアの表面の平滑性が著しく改
善される。On the other hand, when an appropriate amount of Cr2O5 is added, the smoothness of the surface of the carrier core is significantly improved as shown in FIG.
［実施例２コ
Ｆ ｅ２０３４５．２モＪＬ、％、ＭｇＯ３１，９モア
＋、％、Ｚｎ０２２０モル％ｐ ＭｎＯＯ，９モル％な
る配合割合−こＭｏ２Ｏ３無添加の場合（比較品）と０
５〜５０重量％添加した場合（本発明品）の組成の異な
る５種類の粉体を用意し、前記実施例１と同様の方法に
より６０〜２００μｍのフェライトキャリア材を得た。[Example 2 CoF e20345.2MoJL,%, MgO31,9Mo+,%, Zn0220mol%p MnOO, 9mol% blending ratio - the case without Mo2O3 addition (comparative product) and 0
Five types of powders with different compositions were prepared when 5 to 50% by weight was added (products of the present invention), and ferrite carrier materials of 60 to 200 μm were obtained in the same manner as in Example 1 above.
これら各組成のキャリア材の緒特性は、第２表に示す通
りである。また大結晶化率は前記実施例１と同様の方法
により算出したものである。The properties of the carrier materials of each of these compositions are shown in Table 2. Further, the large crystallization rate was calculated by the same method as in Example 1 above.
第 ２ 表
なお、第２表には記載していないが、Ｍｏ２Ｏ３を００
３重量％添加した場合でもかなり大きな大結晶化率が得
られている。Table 2 Although not listed in Table 2, Mo2O3 is
Even when 3% by weight was added, a considerably large crystallization rate was obtained.
し実施例３］
Ｆ ｅ２０３４Ｂ、 ２−ｅ ル％、Ｍ ｇｏ ３０．
６モル％、Ｚｎ０１９０モル％、 Ｍｎ０ ４．２モル
％なる配合割合にＷ０３無添加の場合（比較品）と０８
〜４．８重量％添加した場合（本発明品）の組成の異な
る５種類の粉体を用意し、前記実施例１と同様の方法に
より６０〜２００μｍのフェライトキャリア材を得た。Example 3] Fe2034B, 2-e%, Mgo 30.
6 mol%, Zn0 190 mol%, Mn0 4.2 mol% with no addition of W03 (comparative product) and 08
Five types of powders with different compositions were prepared when ~4.8% by weight was added (products of the present invention), and ferrite carrier materials of 60 to 200 μm were obtained in the same manner as in Example 1 above.
これらキャリア材の緒特性は、第３表に示す通りである
。なお、第３表には記載していないが、ＷＯを００３重
量％添加した場合でもかなり大きな大結晶化率が得られ
ている。The properties of these carrier materials are shown in Table 3. Although not shown in Table 3, even when 0.03% by weight of WO was added, a considerably large crystallization rate was obtained.
なお、上記実施例ではＣｒ、Ｍｏ、Ｗ単独の場合につい
てしか記載していないが、これらの二種思上を複合添加
したものについてもほぼ同様の効果が生じるが、それに
ついての実施例の記載は省略する。In addition, although the above examples describe only the case of Cr, Mo, and W alone, almost the same effect occurs when these two types are added in combination, but the description of the example for this is omitted.
［発明の効果］
本発明は上記のように構成した静電複写用フェライトキ
ャリア材であるので、キャリア材を構成する粒子中の結
晶粒子を成長させることによってキャリア材表面の平滑
性を良好ならしめ、画像特性の安定化と流動性の向上を
図ることができ、それ故キャリア粒子相互の機械的ある
いは衝撃的接触等が生じても結晶体の剥離あるいは破損
現象がほとんど生じず、複写紙面の汚染あるいは感光体
自体の損耗といった従来技術の欠点を完全に解消するこ
とができる。また本発明によれば、フェライトキャリア
材自体が表面平滑性を有しているためコーティングなし
で使用することができるし、原料自身が安価であろこと
と相俟て低廉なキャリア材料を得ることができ、更にキ
ャリア材表面をコーティングする場合であってもコート
厚を均一化することができ、コーテイング材が少量で済
むし、また現像剤としての耐湿特性をも安定化させるこ
とが可能であるなど数々のすぐれた効果を秦しうるもの
である。[Effects of the Invention] Since the present invention is a ferrite carrier material for electrostatic copying constructed as described above, the smoothness of the surface of the carrier material can be improved by growing crystal grains in the particles constituting the carrier material. , it is possible to stabilize image characteristics and improve fluidity. Therefore, even if carrier particles come into mechanical or impact contact with each other, there is almost no peeling or breakage of the crystals, and there is no contamination of the copy paper surface. Alternatively, the disadvantages of the prior art, such as wear and tear on the photoreceptor itself, can be completely eliminated. Further, according to the present invention, since the ferrite carrier material itself has surface smoothness, it can be used without coating, and the raw material itself is inexpensive, making it possible to obtain an inexpensive carrier material. Furthermore, even when coating the surface of a carrier material, the coating thickness can be made uniform, a small amount of coating material is required, and the moisture resistance of the developer can be stabilized. It has many excellent effects.
第１図は本発明に係るマグネシウム−亜鉛基フェライト
キャリア材の電子顕微鏡の影像を模写した図、第２図は
添加剤なしのマグネシウム−亜鉛系フェライトキャリア
材の電子＠微鏡の影像を模写した図である。
特許出願人 富士電気化学株式会社
代 理 人 茂 見 穣
第１図
第２図Figure 1 is a reproduction of an electron microscope image of the magnesium-zinc-based ferrite carrier material according to the present invention, and Figure 2 is a reproduction of an electron microscopic image of the magnesium-zinc-based ferrite carrier material without additives. It is a diagram. Patent applicant: Fuji Electrochemical Co., Ltd. Agent: Minoru Shigeru (Figure 1, Figure 2)
Claims (1)
ル％、ＺｎＯ１８〜２２モル％を有するマグネシウム−
亜鉛系フェライト材に対して周期律表の■族元素のうち
Ｃｒ、 Ｍ ｏ、 Ｗ （７１１種もしくは２種以上の
酸化物を００３〜５■量％含有する組成を有し、球状キ
ャリアを精成する焼結粒子の成長促進によって表面がべ
らかな性状を呈することを特徴とする静電活写用フェラ
イトキャリア材。I Magnesium with Fe2O 345-65 mol%, Mg0 26-32 mol%, ZnO 18-22 mol%
Zinc-based ferrite material has a composition containing 711 types or 2 or more oxides of Cr, Mo, W (711 types or 2 or more types by weight%) of Group 1 elements of the periodic table, and the spherical carrier is refined. A ferrite carrier material for electrostatic printing, which is characterized by a smooth surface due to the promotion of the growth of sintered particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59083538A JPS60227266A (en) | 1984-04-25 | 1984-04-25 | Ferrite carrier material for electrostatic copying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59083538A JPS60227266A (en) | 1984-04-25 | 1984-04-25 | Ferrite carrier material for electrostatic copying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60227266A true JPS60227266A (en) | 1985-11-12 |
Family
ID=13805278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59083538A Pending JPS60227266A (en) | 1984-04-25 | 1984-04-25 | Ferrite carrier material for electrostatic copying |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60227266A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63216060A (en) * | 1987-03-05 | 1988-09-08 | Hitachi Metals Ltd | Carrier particles for developing electrostatic charge image |
| EP0668542A2 (en) * | 1994-02-07 | 1995-08-23 | Basf Aktiengesellschaft | Metaloxide- and metalcoated carrier for electrophotography |
| EP0674238A2 (en) * | 1994-03-23 | 1995-09-27 | Basf Aktiengesellschaft | Carrier for electrophotography having a double metaloxide coating |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123549A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58123548A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58144839A (en) * | 1982-02-13 | 1983-08-29 | Tdk Corp | Magnetic carrier particles |
| JPS58145621A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS58145625A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
-
1984
- 1984-04-25 JP JP59083538A patent/JPS60227266A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123549A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58123548A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58145621A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS58145625A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS58144839A (en) * | 1982-02-13 | 1983-08-29 | Tdk Corp | Magnetic carrier particles |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63216060A (en) * | 1987-03-05 | 1988-09-08 | Hitachi Metals Ltd | Carrier particles for developing electrostatic charge image |
| EP0668542A2 (en) * | 1994-02-07 | 1995-08-23 | Basf Aktiengesellschaft | Metaloxide- and metalcoated carrier for electrophotography |
| EP0668542A3 (en) * | 1994-02-07 | 1995-11-29 | Basf Ag | Metaloxide- and metalcoated carrier for electrophotography. |
| EP0674238A2 (en) * | 1994-03-23 | 1995-09-27 | Basf Aktiengesellschaft | Carrier for electrophotography having a double metaloxide coating |
| US5534378A (en) * | 1994-03-23 | 1996-07-09 | Basf Aktiengesellschaft | Carriers doubly coated with metal oxide and intended for electro-photography |
| EP0674238A3 (en) * | 1994-03-23 | 1996-07-17 | Basf Ag | Carrier for electrophotography having a double metaloxide coating. |
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