JPH09160304A - Carrier for electrostatic latent image developer, electrostatic latent image developer using that and image forming method - Google Patents
Carrier for electrostatic latent image developer, electrostatic latent image developer using that and image forming methodInfo
- Publication number
- JPH09160304A JPH09160304A JP32463695A JP32463695A JPH09160304A JP H09160304 A JPH09160304 A JP H09160304A JP 32463695 A JP32463695 A JP 32463695A JP 32463695 A JP32463695 A JP 32463695A JP H09160304 A JPH09160304 A JP H09160304A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- resin
- latent image
- electrostatic latent
- developer
- 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.)
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- Dry Development In Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、電子写真法、静電
記録法において静電潜像のために使用される静電潜像現
像剤用キャリア及びそれを用いた静電潜像現像剤並びに
画像形成方法に関する。TECHNICAL FIELD The present invention relates to a carrier for an electrostatic latent image developer used for an electrostatic latent image in an electrophotographic method or an electrostatic recording method, an electrostatic latent image developer using the carrier, and The present invention relates to an image forming method.
【0002】[0002]
【従来の技術】従来、電子写真法においては、感光体や
静電記録体上に種々の手段を用いて静電潜像を形成し、
この静電潜像にトナーと呼ばれる検電性微粒子を付着さ
せて、静電潜像を現像する方法が一般的に使用されてい
る。2. Description of the Related Art Conventionally, in electrophotography, an electrostatic latent image is formed on a photosensitive member or an electrostatic recording member by using various means,
A method of developing an electrostatic latent image by attaching electroconductive fine particles called toner to the electrostatic latent image is generally used.
【0003】この現像に際しては、キャリアと呼ばれる
担体粒子をトナー粒子と混合し、両者を相互に摩擦帯電
させて、トナーに適当量の正または負の電荷を付与して
いる。キャリアは、一般に表面に被膜層を有するコート
キャリアと、表面に被膜層を有しない非コートキャリア
とに大別されるが、現像剤寿命等を考慮した場合には、
コートキャリアの方が優れていることから、種々のタイ
プのコートキャリアが開発され、かつ実用化されてい
る。In this development, carrier particles called carriers are mixed with toner particles and both are triboelectrically charged to give a proper amount of positive or negative electric charge to the toner. Carriers are generally roughly classified into a coated carrier having a coating layer on the surface and a non-coated carrier having no coating layer on the surface. In consideration of the developer life, etc.,
Since the coated carrier is superior, various types of coated carriers have been developed and put into practical use.
【0004】コートキャリアに要求される特性は種々あ
るが、トナーに適度な帯電性(電荷量や電荷分布)を付
与すること、トナーの適切な帯電性を長期にわたって維
持すること、この為に要求される耐衝撃性、耐磨耗性、
そして湿度や温度等の環境変化に対しても、トナーの帯
電性を変化させないことが特に重要であり、種々のコー
トキャリアが提案されている。Although there are various characteristics required of the coated carrier, it is required to impart appropriate chargeability (charge amount and charge distribution) to the toner and to maintain the proper chargeability of the toner for a long period of time. Impact resistance, wear resistance,
It is particularly important that the chargeability of the toner is not changed even with environmental changes such as humidity and temperature, and various coat carriers have been proposed.
【0005】このような課題に対して、長寿命のコート
キャリアを提供する目的で、特開昭61−80161号
公報、同61−80162号公報、同61−80163
号公報には、含窒素フッ素化アルキル(メタ)アクリレ
ートとビニル系モノマーとの共重合体や、フッ素化アル
キル(メタ)アクリレートと含窒素ビニル系モノマーと
の共重合体等の樹脂でキャリア芯材表面をコートする技
術が提案されている。これらによれば、比較的長寿命の
キャリアは得られるものの、樹脂コートに伴うキャリア
の絶縁化によって、現像時におけるキャリアの帯電性が
低下するため、特に黒ベタ部でエッジ効果が出る等ソリ
ッドの再現性に劣る、被写体が写真のように中間調の場
合には非常に再現性の悪い画像となる等の欠点を有して
いた。For the purpose of providing a coated carrier having a long service life against such problems, JP-A-61-80161, JP-A-61-80162 and JP-A-61-80163 are used.
In the publication, a resin such as a copolymer of a nitrogen-containing fluorinated alkyl (meth) acrylate and a vinyl-based monomer or a copolymer of a fluorinated alkyl (meth) acrylate and a nitrogen-containing vinyl-based monomer is used as a carrier core material. Techniques for coating the surface have been proposed. According to these, although a carrier having a relatively long life can be obtained, the chargeability of the carrier at the time of development is lowered due to the insulation of the carrier caused by the resin coating, so that the solid effect such as the edge effect is produced particularly in the black solid part. It has drawbacks such as poor reproducibility and a very poor reproducibility when the subject is a halftone image like a photograph.
【0006】一方、ソリッドの再現性を改善する目的
で、コート膜中に導電材料を分散させたキャリアが、特
開平1−101560号公報、特開平1−105264
号公報に提案されている。このようなコートキャリアの
電気抵抗は、コート被膜中に分散された導電材料間の接
触確率に依存しているが、コート被膜中における導電材
料の分散制御が困難であり、さらに、孤立した導電材料
が存在することになるため、導電材料の分散量に対して
効率的な帯電性が得られない。On the other hand, for the purpose of improving the reproducibility of solids, carriers in which a conductive material is dispersed in a coat film are disclosed in JP-A-1-101560 and JP-A-1-105264.
No. 1993. The electric resistance of such a coated carrier depends on the contact probability between the conductive materials dispersed in the coat film, but it is difficult to control the dispersion of the conductive material in the coat film. Therefore, efficient charging cannot be obtained with respect to the dispersed amount of the conductive material.
【0007】[0007]
【発明が解決しようとする課題】本発明は、従来の技術
における上記のような問題点に鑑みてなされたものであ
る。従って、本発明の目的は、キャリア表面を樹脂で被
覆したコートキャリアにおいても、現像剤の抵抗が高く
ならず、所望の帯電性が得られ、従って、中間調再現性
の優れた画像を形成することができ、さらに、非常に寿
命の長い静電潜像現像剤用キャリアを提供することにあ
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in the prior art. Therefore, the object of the present invention is to obtain a desired chargeability without increasing the resistance of the developer even in a coated carrier in which the carrier surface is coated with a resin, thus forming an image with excellent halftone reproducibility. Another object of the present invention is to provide a carrier for an electrostatic latent image developer which can be obtained and has a very long life.
【0008】本発明の他の目的は、コート被膜中の導電
材料を効率よく作用させ、しかも簡便に製造できる静電
潜像現像剤用キャリアを提供することにある。Another object of the present invention is to provide a carrier for an electrostatic latent image developer which allows a conductive material in a coat film to act efficiently and can be easily manufactured.
【0009】本発明の他の目的は、前記の特性を有する
静電潜像現像用キャリアを用いた中間調再現性の優れた
画像を形成することができる静電潜像現像剤であって、
且つ、内部に帯電制御剤を含有しないカラートナーと共
に用いるのに適した静電潜像現像剤を提供することにあ
る。Another object of the present invention is an electrostatic latent image developer which is capable of forming an image having excellent halftone reproducibility using the electrostatic latent image developing carrier having the above characteristics.
Another object of the present invention is to provide an electrostatic latent image developer suitable for use with a color toner containing no charge control agent inside.
【0010】また、本発明の目的は、この優れた特性を
備えた静電潜像現像剤を用いた中間調再現性の優れた画
像を形成することができる画像形成方法を提供すること
にある。Another object of the present invention is to provide an image forming method capable of forming an image having excellent halftone reproducibility by using an electrostatic latent image developer having such excellent characteristics. .
【0011】[0011]
【課題を解決するための手段】本発明者等は、従来の技
術における上述のような欠点を改善すべく、静電潜像現
像用キャリアについて鋭意研究し、検討した結果、静電
潜像現像用キャリアにおいて、該キャリアがキャリア芯
材上に樹脂及び導電性粉末からなる被覆層を有する静電
潜像現像剤用キャリアであって、導電性粉末が樹脂コー
ト層表面に露出するように被覆層内に保持されることで
上記目的が達成されることを見出し、本発明を完成する
に至った。DISCLOSURE OF THE INVENTION The inventors of the present invention have diligently studied and studied an electrostatic latent image developing carrier in order to improve the above-mentioned drawbacks in the prior art. Is a carrier for an electrostatic latent image developer having a coating layer comprising a resin and a conductive powder on a carrier core material, and the coating layer is such that the conductive powder is exposed on the surface of the resin coating layer. It was found that the above-mentioned object can be achieved by retaining the inside, and completed the present invention.
【0012】すなわち、本発明の第一の静電潜像現像剤
用キャリアは、キャリア芯材上に樹脂及び導電性粉末か
らなる被覆層を有する静電潜像現像剤用キャリアであっ
て、該導電性粉末の平均一次粒子径を(B)μm、樹脂
コート厚みを(A)μmとしたとき、両者の関係が下記
式を満足することを特徴とする。 (A)≦(B)≦(A)+3(μm) このとき、前記キャリアを被覆する樹脂は、少なくとも
フッ素系樹脂及びシリコーン樹脂からなる群から選択さ
れる一種又は二種以上を含有することが好ましく、前記
キャリア芯材の平均粒径が10〜500μmであること
が好ましく、さらに、前記樹脂コート厚みが0.1〜1
0μmであることが好ましい。That is, the first electrostatic latent image developer carrier of the present invention is an electrostatic latent image developer carrier having a coating layer made of a resin and a conductive powder on a carrier core material. When the average primary particle diameter of the conductive powder is (B) μm and the resin coat thickness is (A) μm, the relationship between the two satisfies the following formula. (A) ≦ (B) ≦ (A) +3 (μm) At this time, the resin coating the carrier may contain at least one kind or two or more kinds selected from the group consisting of a fluororesin and a silicone resin. Preferably, the average particle size of the carrier core material is 10 to 500 μm, and the resin coat thickness is 0.1 to 1
It is preferably 0 μm.
【0013】また、本発明の静電潜像現像剤は、結着樹
脂と着色剤からなるトナー粒子と、キャリア芯材上に樹
脂及び導電性粉末からなる被覆層を有するキャリアと、
からなる静電潜像現像剤において、該導電性粉末の平均
一次粒子径を(B)μm、樹脂コート厚みを(A)μm
としたとき、両者の関係が下記式を満足することを特徴
とする。The electrostatic latent image developer of the present invention comprises toner particles composed of a binder resin and a colorant, a carrier having a coating layer composed of a resin and a conductive powder on a carrier core material,
In the electrostatic latent image developer, the average primary particle diameter of the conductive powder is (B) μm, and the resin coat thickness is (A) μm.
Then, the relationship between them satisfies the following equation.
【0014】(A)≦(B)≦(A)+3(μm) この静電潜像現像剤に用いられる前記トナー粒子は、カ
ラートナー粒子であることが本発明の効果の観点から好
適である。(A) ≦ (B) ≦ (A) +3 (μm) From the viewpoint of the effect of the present invention, it is preferable that the toner particles used in the electrostatic latent image developer are color toner particles. .
【0015】また、本発明の静電潜像現像剤において
は、前記キャリア芯材の被覆層を構成する樹脂が、少な
くともフッ素系樹脂及びシリコーン樹脂からなる群から
選択される一種又は二種以上を含有することが好まし
く、前記キャリア芯材の平均粒径が10〜500μmで
あることが好ましく、さらに、前記樹脂コート厚みが
0.1〜10μmであることが好ましい。In the electrostatic latent image developer of the present invention, the resin constituting the coating layer of the carrier core material is at least one selected from the group consisting of fluorine resin and silicone resin. It is preferable to contain the carrier core material, the average particle diameter of the carrier core material is preferably 10 to 500 μm, and the resin coat thickness is preferably 0.1 to 10 μm.
【0016】さらに、本発明の画像形成方法は、潜像担
持体に潜像を形成する工程と、該潜像を現像剤を用いて
現像する工程と、現像されたトナー像を転写体上に転写
する工程と、転写体上のトナー像を加熱定着する工程
と、を含む画像形成方法において、該現像剤として、前
記特定の静電潜像現像剤を用いることを特徴とする。Further, in the image forming method of the present invention, a step of forming a latent image on the latent image carrier, a step of developing the latent image with a developer, and a developed toner image on the transfer body. In the image forming method including the step of transferring and the step of heating and fixing the toner image on the transfer body, the specific electrostatic latent image developer is used as the developer.
【0017】[0017]
【発明の実施の形態】以下、本発明について詳細に説明
する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
【0018】本発明の静電潜像現像用キャリアが適用し
うる形態としては、磁性体を樹脂中に分散させた、いわ
ゆる磁性体分散型キャリア、金属粉体表面に樹脂を被膜
した樹脂コートキャリアのいずれかに限定するものでな
く、いずれに用いてもその効果は有効である。The electrostatic latent image developing carrier of the present invention can be applied to a so-called magnetic substance-dispersed carrier in which a magnetic substance is dispersed in a resin, or a resin-coated carrier having a metal powder surface coated with a resin. The effect is effective even if it is used in any one.
【0019】本発明において用いられる磁性体又はキャ
リア芯材の素材としては、鉄、鋼、ニッケル、コバルト
等の磁性金属、フェライト、マグネタイト等の磁性酸化
物、ガラスビーズ等があげられるが、画像形成に磁気ブ
ラシ法を用いる観点からは、磁性金属、磁性酸化物から
選ばれることが望ましい。Materials for the magnetic material or carrier core material used in the present invention include magnetic metals such as iron, steel, nickel and cobalt, magnetic oxides such as ferrite and magnetite, and glass beads. From the viewpoint of using the magnetic brush method for the above, it is desirable to be selected from magnetic metals and magnetic oxides.
【0020】磁性体分散型キャリア用の磁性体として用
いられる場合の平均粒径は、一般的に0.05μm〜1
μm程度であり、0.1μm〜0.6μmのものが好ま
しい。キャリア芯材の平均粒径としては、一般的には1
0μm〜500μmのものが用いられ、好ましくは30
μm〜150μmのものが用いられる。When used as a magnetic material for a magnetic material dispersion type carrier, the average particle diameter is generally 0.05 μm to 1
It is about μm, and preferably 0.1 μm to 0.6 μm. The average particle size of the carrier core material is generally 1
Those having a size of 0 μm to 500 μm are used, and preferably 30
Those having a thickness of μm to 150 μm are used.
【0021】本発明において、使用される導電性粉末と
しては、金、銀、銅などの金属粉末やカーボンブラッ
ク、更に酸化チタン、酸化亜鉛などの半導電性酸化物、
酸化チタン、酸化亜鉛、硫酸バリウム、ホウ酸アルミニ
ウム、チタン酸カリウム等の粉末表面を酸化スズやカー
ボンブラック、金属で被覆したもの等が挙げられ、その
固有抵抗が1010Ω・cm以下のものが好ましい。In the present invention, the conductive powder used is a metal powder of gold, silver, copper or the like, carbon black, a semiconductive oxide such as titanium oxide or zinc oxide,
Examples include powders of titanium oxide, zinc oxide, barium sulfate, aluminum borate, potassium titanate, etc. whose surface is coated with tin oxide, carbon black, or metal, and whose specific resistance is 10 10 Ω · cm or less. preferable.
【0022】これらの導電性粉末の平均一次粒子径を
(B)(μm)、その樹脂コート厚みを(A)(μm)
としたとき、(A)と(B)との関係は下記式を満足す
るものでなければならない。The average primary particle diameter of these conductive powders is (B) (μm), and the resin coat thickness is (A) (μm).
Then, the relationship between (A) and (B) must satisfy the following formula.
【0023】(A)≦(B)≦(A)+3(μm) 上記式を満足するとき、キャリア芯材の被覆層に含まれ
る導電性粉末は、粉末単体で絶縁性の樹脂でコートされ
たキャリア芯材と接点をもちながら、かつ、キャリアの
被覆層表面に露出するように存在することができる。こ
のことから、導電性無機粉はそのほとんどが樹脂コート
膜中で導電路として作用し、さらに、単体で作用できる
ために、カーボンブラックのストラクチャーを制御する
如き分散技術をさほど必要としない。従って、導電性粉
末の樹脂コート膜への添加量を少なくすることができ、
キャリア製造におけるコストダウンが可能となる。(A) .ltoreq. (B) .ltoreq. (A) +3 (μm) When the above formula is satisfied, the conductive powder contained in the coating layer of the carrier core material is a powder alone coated with an insulating resin. It can be present so as to have a contact with the carrier core and be exposed on the surface of the coating layer of the carrier. From this fact, most of the conductive inorganic powders act as a conductive path in the resin coating film, and further, they can act as a single substance, so that a dispersion technique such as controlling the structure of carbon black is not required so much. Therefore, the amount of conductive powder added to the resin coating film can be reduced,
It is possible to reduce the cost in manufacturing the carrier.
【0024】ここで、導電性粉末の平均一次粒子径が樹
脂コート厚みより小さい〔(A)<(B)〕と、導電性
粉末が単体で樹脂コート膜中の導電路として作用できな
くなり、一次粒子径が上記範囲の上限を超える〔(A)
+3(μm)<(B)〕と、キャリア表面被覆層から導
電性粉末が脱落し易くなって複写回数の増加にともなっ
て画像変動がでる虞があり、いずれも好ましくない。If the average primary particle diameter of the conductive powder is smaller than the resin coat thickness [(A) <(B)], the conductive powder alone cannot act as a conductive path in the resin coat film, and The particle size exceeds the upper limit of the above range [(A)
If +3 (μm) <(B)], the conductive powder is likely to fall off from the carrier surface coating layer, and there is a possibility that image variations occur with an increase in the number of copying, which is not preferable.
【0025】導電性粉末の平均一次粒子径は、0.1μ
mを超え13μm未満の範囲であり、且つ、樹脂コート
厚みとの関係が前記式を満たす範囲で、キャリアの使用
目的(所望の帯電特性)に応じて適宜選択することがで
きる。The average primary particle size of the conductive powder is 0.1 μm.
It can be appropriately selected depending on the purpose of use (desired charging property) of the carrier within a range of more than m and less than 13 μm and a relationship with the resin coat thickness satisfying the above formula.
【0026】キャリアの被覆層を構成する樹脂として
は、ポリオレフィン系樹脂(例えば、ポリエチレン、ポ
リプロピレン等)、ポリビニル及びポリビニリデン系樹
脂(例えば、ポリスチレン等)、アクリル樹脂、ポリア
クリロニトリル、ポリビニルアセテート、ポリビニルア
ルコール、ポリビニルブチラール、ポリ塩化ビニル、ポ
リビニルカルバゾール、ポリビニルエーテル及びポリビ
ニルケトン、ポリエステル、ポリウレタン、ポリカーボ
ネート、アミノ樹脂(例えば、尿素−ホルムアルデヒド
樹脂)、エポキシ樹脂、塩化ビニル−酢酸ビニル共重合
体、スチレン−アクリル酸共重合体、オルガノシロキサ
ン結合からなる直鎖状シリコン樹脂及びその変性品、フ
ッ素樹脂(例えば、ポリテトラフルオロエチレン、ポリ
フッ化ビニル、ポリフッ化ビニリデン、ポリクロロトリ
フルオロエチレン)等が挙げられる。As the resin constituting the carrier coating layer, a polyolefin resin (eg polyethylene, polypropylene etc.), polyvinyl and polyvinylidene resin (eg polystyrene etc.), acrylic resin, polyacrylonitrile, polyvinyl acetate, polyvinyl alcohol. , Polyvinyl butyral, polyvinyl chloride, polyvinyl carbazole, polyvinyl ether and polyvinyl ketone, polyester, polyurethane, polycarbonate, amino resin (for example, urea-formaldehyde resin), epoxy resin, vinyl chloride-vinyl acetate copolymer, styrene-acrylic acid Copolymer, linear silicone resin composed of organosiloxane bond and its modified product, fluororesin (eg, polytetrafluoroethylene, polyvinyl fluoride, polyvinyl Kka vinylidene, polychlorotrifluoroethylene), and the like.
【0027】本発明の静電潜像現像剤用キャリアにおけ
る被覆層に用いる樹脂に特に制限はないが、低表面エネ
ルギー材料であるフッ素系樹脂及びシリコーン系樹脂か
らなる群から選択される一種又は二種以上を含有するの
が、キャリア表面の汚染を抑制する観点から好適であ
る。The resin used for the coating layer in the carrier for electrostatic latent image developer of the present invention is not particularly limited, but one or two selected from the group consisting of fluorine resin and silicone resin which are low surface energy materials. It is preferable to contain at least one species from the viewpoint of suppressing contamination of the carrier surface.
【0028】キャリア芯材の表面に被覆層を形成する方
法としては、導電性粉末を前記樹脂中に予め分散した
後、芯材にコートする方法を適用することが、被覆層中
の導電性粉末の付着状態の観点から好ましい。分散方法
としては、コート樹脂を溶剤に溶解した後、導電性粉末
を添加して、サンドミル、ボールミル、ホモミキサー等
の公知の機械的分散手段により分散する方法が挙げられ
る。As a method of forming the coating layer on the surface of the carrier core material, a method of dispersing the conductive powder in the resin in advance and then coating the core material is applied. Is preferable from the viewpoint of the adhered state of. Examples of the dispersing method include a method of dissolving the coating resin in a solvent, adding a conductive powder, and dispersing by a known mechanical dispersing means such as a sand mill, a ball mill and a homomixer.
【0029】導電性粉末の配合量は、前記コート樹脂の
0.01〜50重量%の範囲であることが好ましく、
0.01重量%未満であると導電性が不充分となり、5
0重量%を超えると付着強度が低下するためいずれも好
ましくない。The amount of the conductive powder compounded is preferably in the range of 0.01 to 50% by weight of the coating resin,
If it is less than 0.01% by weight, the electrical conductivity will be insufficient and
If the amount exceeds 0% by weight, the adhesive strength will be reduced, which is not preferable.
【0030】導電性粉末を分散したコート樹脂によりキ
ャリア芯材上に被覆層を形成する方法には、特に制限は
なく、公知の被覆方法、例えば、キャリア芯材である粉
末を、被膜層形成用溶液中に浸漬する浸漬法、被膜層形
成用溶液をキャリア芯材の表面に噴霧するスプレー法、
キャリア芯材を流動エアーにより浮遊させた状態で被膜
層形成用溶液を噴霧する流動床法、ニーダーコーター中
でキャリア芯材と被膜層形成用溶液を混合し、溶剤を除
去するニーダーコーター法等が挙げられ、いずれも適用
することができるが、本発明においてはニーダーコータ
ー法が、特に好ましく用いられる。この方法によれば、
処理するキャリア粉に機械的にシェアをかけながらコー
ティングを完了するので、導電性粉体がキャリア芯材と
接点を持ちやすくなる。The method for forming the coating layer on the carrier core material with the coating resin in which the conductive powder is dispersed is not particularly limited, and a known coating method, for example, a powder as the carrier core material is used for forming the coating layer. Immersion method of immersing in the solution, spray method of spraying the coating layer forming solution on the surface of the carrier core material,
A fluidized bed method of spraying a coating layer forming solution in a state where the carrier core material is suspended by fluidized air, a kneader coater method of removing the solvent by mixing the carrier core material and the coating layer forming solution in a kneader coater, etc. Although any of them can be applied, the kneader coater method is particularly preferably used in the present invention. According to this method,
Since the coating is completed while mechanically shearing the carrier powder to be processed, the conductive powder easily holds a contact with the carrier core material.
【0031】被膜層形成用塗布液に使用する溶剤は、前
記コート樹脂を溶解するものであれば特に限定されるも
のではなく、用いられるコート樹脂に適合するように選
択することができる。一般的には、例えば、トルエン、
キシレン等の芳香族炭化水素類、アセトン、メチルエチ
ルケトン等のケトン類、テトラヒドロフラン、ジオキサ
ンなどのエーテル類が使用できる。The solvent used in the coating liquid for forming the coating layer is not particularly limited as long as it dissolves the coating resin, and can be selected so as to be compatible with the coating resin used. Generally, for example, toluene,
Aromatic hydrocarbons such as xylene, ketones such as acetone and methyl ethyl ketone, and ethers such as tetrahydrofuran and dioxane can be used.
【0032】形成される樹脂コート層の膜厚(樹脂コー
ト厚み)は、通常0.1〜10μm、好ましくは0.4
〜4μmの範囲である。この樹脂コート厚みは、キャリ
ア芯材の比重をρD 、キャリア芯材の平均粒径をD、コ
ートした樹脂の比重をρC と樹脂の全コート量をWC と
したとき、下記式によって簡易に計算される。The thickness of the resin coat layer formed (resin coat thickness) is usually 0.1 to 10 μm, preferably 0.4.
44 μm. This resin coat thickness is simply calculated by the following formula, where ρ D is the specific gravity of the carrier core material, D is the average particle diameter of the carrier core material, ρ C is the specific gravity of the coated resin, and W C is the total coating amount of the resin. Calculated to.
【0033】[0033]
【数1】 [Equation 1]
【0034】上記式から、好適な樹脂コート厚みに調整
することにより、導電性粉末の平均一次粒径と樹脂コー
ト厚みとの関係が良好な範囲にあるコートキャリアを簡
単に調製することができる。From the above formula, by adjusting to a suitable resin coat thickness, it is possible to easily prepare a coated carrier having a good relation between the average primary particle diameter of the conductive powder and the resin coat thickness.
【0035】この静電潜像現像用キャリアは、好適な導
電性と、樹脂コートによる長寿命とを両立した優れた性
能を示すものである。This electrostatic latent image developing carrier exhibits excellent performance in which both suitable conductivity and long life due to resin coating are achieved.
【0036】次に、本発明の静電潜像現像剤について説
明する。本発明の静電潜像現像剤は、前記の静電潜像現
像用キャリアと、結着樹脂と着色剤からなるトナー粒子
と、からなるものであり、黒色用としてもカラー用とし
ても好適に使用しうるが、特にカラートナー粒子との組
合せにおいて、効果が著しい。Next, the electrostatic latent image developer of the present invention will be described. The electrostatic latent image developer of the present invention comprises the above electrostatic latent image developing carrier and toner particles composed of a binder resin and a colorant, and is suitable for both black and color. Although it can be used, the effect is remarkable especially in combination with color toner particles.
【0037】即ち、通常、カラートナーには熱保完性の
観点から外添剤が多く使用されているが、外添剤がキャ
リアと接触するとキャリアに移行してキャリアのコート
樹脂を摩耗させ、樹脂の帯電制御力が低下する虞があっ
た。耐摩耗性を向上するために樹脂コートの厚みを大き
くすると、高抵抗キャリアとなり、低抵抗のキャリアが
好ましいカラー現像剤用には不適であるという問題があ
る。本発明の静電潜像現像剤に用いられるキャリアは、
樹脂コートの膜厚は好適な範囲であり、しかも被覆層表
面に導電性粉末である無機粉末が露出しているために耐
摩耗性が良好で、且つ、抵抗が低いので、カラートナー
粒子と併用するのに好適なキャリア特性を備えている。That is, usually, an external additive is often used in the color toner from the viewpoint of heat retention, but when the external additive comes into contact with the carrier, it moves to the carrier and abrades the coat resin of the carrier, There is a possibility that the charge control force of the resin may be reduced. When the thickness of the resin coat is increased in order to improve the abrasion resistance, it becomes a high resistance carrier, and there is a problem that a low resistance carrier is not suitable for a color developer. The carrier used in the electrostatic latent image developer of the present invention,
The thickness of the resin coat is in a suitable range, and since the inorganic powder, which is a conductive powder, is exposed on the surface of the coating layer, the abrasion resistance is good, and the resistance is low, so it is used in combination with the color toner particles. It has suitable carrier characteristics.
【0038】本発明の現像剤に使用されるトナー粒子の
着色剤としては、カーボンブラック、ニグロシン、アニ
リンブルー、カルコイルブルー、クロムイエロー、ウル
トラマリンブルー、デュポンオイルレッド、キノリンイ
エロー、メチレンブルークロリド、フタロシアニンブル
ー、マラカイトグリーン・オキサレート、ランプブラッ
ク、ローズベンガル、C.I.ピグメント・レッド4
8:1、C.I.ピグメント・レッド122、C.I.
ピグメント・レッド57:1、C.I.ピグメント・イ
エロー97、C.I.ピグメント・イエロー12、C.
I.ピグメント・ブルー15:1、C.I.ピグメント
・ブルー15:3などを代表的なものとして例示するこ
とができる。As the colorant for toner particles used in the developer of the present invention, carbon black, nigrosine, aniline blue, calcyl blue, chrome yellow, ultramarine blue, DuPont oil red, quinoline yellow, methylene blue chloride, phthalocyanine. Blue, Malachite Green Oxalate, Lamp Black, Rose Bengal, C.I. I. Pigment Red 4
8: 1, C.I. I. Pigment Red 122, C.I. I.
Pigment Red 57: 1, C.I. I. Pigment Yellow 97, C.I. I. Pigment Yellow 12, C.I.
I. Pigment Blue 15: 1, C.I. I. Pigment Blue 15: 3 and the like can be exemplified.
【0039】また、トナー粒子の結着樹脂としては、ス
チレン、クロロスチレン等のスチレン類、エチレン、プ
ロピレン、ブチレン、イソプレン等のモノオレフィン、
酢酸ビニル、プロピオン酸ビニル、安息香酸ビニル、酢
酸ビニル等のビニルエステル、アクリル酸メチル、アク
リル酸エチル、アクリル酸ブチル、アクリル酸ドデシ
ル、アクリル酸オクチル、アクリル酸フェニル、メタク
リル酸メチル、メタクリル酸エチル、メタクリル酸ブチ
ル、メタクリル酸ドデシル等のα−メチレン脂肪族モノ
カルボン酸エステル、ビニルメチルエーテル、ビニルエ
チルエーテル、ビニルブチルエーテル等のビニルエーテ
ル、ビニルメチルケトン、ビニルヘキシルケトン、ビニ
ルイソプロペニルケトン等のビニルケトン等の単独重合
体あるいは共重合体を例示することができ、特に代表的
な結着樹脂としては、ポリスチレン、スチレン−アクリ
ル酸アルキル共重合体、スチレン−メタクリル酸アルキ
ル共重合体、スチレン−アクリロニトリル共重合体、ス
チレン−ブタジエン共重合体、スチレン−無水マレイン
酸共重合体、ポリエチレン、ポリプロピレンを挙げるこ
とができる。さらに、ポリエステル、ポリウレタン、エ
ポキシ樹脂、シリコン樹脂、ポリアミド、変性ロジン、
パラフィン、ワックス類等も代表的な結着樹脂として挙
げることができる。As the binder resin for the toner particles, styrenes such as styrene and chlorostyrene, monoolefins such as ethylene, propylene, butylene and isoprene,
Vinyl acetate, vinyl propionate, vinyl benzoate, vinyl acetate and other vinyl esters, methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate, methyl methacrylate, ethyl methacrylate, Α-methylene aliphatic monocarboxylic acid esters such as butyl methacrylate and dodecyl methacrylate, vinyl ethers such as vinyl methyl ether, vinyl ethyl ether and vinyl butyl ether, vinyl ketones such as vinyl methyl ketone, vinyl hexyl ketone and vinyl isopropenyl ketone. Examples thereof include homopolymers and copolymers, and particularly typical binder resins include polystyrene, styrene-alkyl acrylate copolymer, styrene-alkyl methacrylate copolymer, and styrene. - acrylonitrile copolymer, styrene - butadiene copolymer, styrene - maleic anhydride copolymer, polyethylene, polypropylene. Furthermore, polyester, polyurethane, epoxy resin, silicone resin, polyamide, modified rosin,
Paraffin and waxes can also be mentioned as typical binder resins.
【0040】これらの結着樹脂の中でも、特にポリエス
テルを結着樹脂とした場合が好ましく、例えば、ビスフ
ェノールAと多価芳香族カルボン酸とを主単量体成分と
した重縮合物よりなる線状ポリエステル樹脂が好ましく
使用できる。Among these binder resins, it is particularly preferable to use polyester as the binder resin. For example, a linear polycondensate containing bisphenol A and a polyvalent aromatic carboxylic acid as main monomer components. Polyester resin can be preferably used.
【0041】また物性の観点からは、軟化点が90〜1
50℃、ガラス転移点が50〜70℃、数平均分子量が
2000〜6000、重量平均分子量が8000〜15
0000、酸価5〜30、水酸基価5〜40を示す樹脂
が、結着樹脂として特に好ましく使用できる。From the viewpoint of physical properties, the softening point is 90 to 1
50 ° C., glass transition point is 50 to 70 ° C., number average molecular weight is 2,000 to 6,000, and weight average molecular weight is 8,000 to 15,
Resins having a 0000, an acid value of 5 to 30, and a hydroxyl value of 5 to 40 can be particularly preferably used as the binder resin.
【0042】本発明の現像剤に用いられるトナー粒子に
は、前記着色剤、結着樹脂に加えて、所望により公知の
帯電制御剤、定着助剤等の添加剤を配合することができ
る。The toner particles used in the developer of the present invention may contain known additives such as a charge control agent and a fixing aid, if desired, in addition to the colorant and the binder resin.
【0043】本発明の静電潜像現像剤は、本発明の静電
潜像現像剤用キャリアにトナー粒子を添加し、キャリア
表面をトナー粒子が被覆する状態で構成されるが、キャ
リアに対するトナー粒子の添加量は公知の範囲で用いら
れる。The electrostatic latent image developer of the present invention is formed by adding toner particles to the carrier for electrostatic latent image developer of the present invention and coating the surface of the carrier with the toner particles. The amount of particles added is within a known range.
【0044】本発明の静電潜像現像剤によれば、現像時
におけるキャリアの帯電性が低下することなく、ソリッ
ドの再現性が良好で、且つ、被写体が写真のように中間
調の場合にも非常に再現性の良い画像が得られるという
利点を有する。According to the electrostatic latent image developer of the present invention, the chargeability of the carrier at the time of development is not lowered, the solid reproducibility is good, and the subject is in a halftone as in a photograph. Also has the advantage that an image with very good reproducibility can be obtained.
【0045】次に、本発明の画像形成方法について説明
する。本発明の画像形成方法は、潜像担持体に潜像を形
成する工程と、該潜像を現像剤を用いて現像する工程
と、現像されたトナー像を転写体上に転写する工程と、
転写体上のトナー像を加熱定着する工程と、を含む画像
形成方法において、現像剤として、前記した本発明の静
電潜像現像剤を用いることを特徴とするものであり、こ
の方法によれば、現像剤の寿命が長く、また、中間調の
画像の再現性が良好であり、繰り返し画像形成を行って
も、画像劣化を防止し得るという優れた効果を示す。Next, the image forming method of the present invention will be described. The image forming method of the present invention comprises the steps of forming a latent image on a latent image carrier, developing the latent image with a developer, and transferring the developed toner image onto a transfer body.
An image forming method including the step of heating and fixing a toner image on a transfer body, wherein the electrostatic latent image developer of the present invention is used as a developer. For example, the life of the developer is long, the reproducibility of a halftone image is good, and even if the image formation is repeated, the image deterioration can be prevented.
【0046】[0046]
【実施例】以下に、実施例を挙げて本発明を具体的に説
明するが、本発明はこれに限定されるものではない。EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.
【0047】(実施例1)キャリアの製造 キャリアA フェライト粒子(平均粒径;50μm) 100重量部 トルエン 14重量部 スチレンメタクリレート共重合体 2.0重量部 酸化スズでコートしたホウ酸アルミニウム(平均粒径;1μm) 0.5重量部 キャリア芯材であるフェライト粒子を除く上記成分をサ
ンドミルで10分間分散し、被膜層形成液を調合した。
さらに、この被膜層形成液とフェライト粒子とを真空脱
気型ニーダーにいれ、温度60℃において10分撹拌し
た後、減圧して溶剤であるトルエンを留去して、導電性
粉末であるホウ酸アルミニウムを分散したコート樹脂か
らなる被膜層を芯材上に形成したキャリアAを得た。Example 1 Production of Carrier Carrier A Ferrite particles (average particle size: 50 μm) 100 parts by weight Toluene 14 parts by weight Styrene methacrylate copolymer 2.0 parts by weight Aluminum borate coated with tin oxide (average particle size) Diameter: 1 μm) 0.5 parts by weight The above components excluding the ferrite particles that are the carrier core material were dispersed in a sand mill for 10 minutes to prepare a coating layer forming liquid.
Further, this coating layer forming liquid and ferrite particles are put in a vacuum degassing type kneader, stirred at a temperature of 60 ° C. for 10 minutes, and then depressurized to distill off toluene which is a solvent, and boric acid which is a conductive powder. A carrier A was obtained in which a coating layer made of a coating resin in which aluminum was dispersed was formed on a core material.
【0048】計算により得られた樹脂コートの膜厚は
0.8μmであった。 (A=0.8)≦(B=1)≦(3.8)(μm) (実施例2) キャリアB フェライト粒子(平均粒径;50μm) 100重量部 トルエン 14重量部 スチレンメタクリレート共重合体 1.6重量部 パーフルオロアクリレート共重合体 0.5重量部 酸化スズでコートしたホウ酸バリウム(平均粒径;2μm) 1重量部 フェライト粒子を除く上記成分をホモミキサーで10分
間分散し、被膜層形成液を調合し、更に、この被膜層形
成液とフェライト粒子とを真空脱気型ニーダーにいれ、
温度60℃におて30分撹拌した後、減圧してトルエン
を留去して、導電性粉末であるホウ酸バリニウムを分散
した、フッ素系樹脂を含むコート樹脂からなる被膜層を
芯材上に形成したキャリアBを得た。The film thickness of the resin coat obtained by the calculation was 0.8 μm. (A = 0.8) ≦ (B = 1) ≦ (3.8) (μm) (Example 2) Carrier B Ferrite particles (average particle size; 50 μm) 100 parts by weight Toluene 14 parts by weight Styrene methacrylate copolymer 1.6 parts by weight Perfluoroacrylate copolymer 0.5 parts by weight Barium borate coated with tin oxide (average particle size; 2 μm) 1 part by weight The above components except ferrite particles are dispersed for 10 minutes with a homomixer to form a film. A layer forming liquid is prepared, and the coating layer forming liquid and ferrite particles are put in a vacuum degassing type kneader,
After stirring at a temperature of 60 ° C. for 30 minutes, the toluene was distilled off under reduced pressure, and a coating layer made of a coating resin containing a fluorine-based resin, in which barium borate as a conductive powder was dispersed, was formed on the core material. The formed carrier B was obtained.
【0049】計算により得られた樹脂コートの膜厚は
0.84μmであった。 (A=0.84)≦(B=2)≦(3.84)(μm) (比較例1) キャリアC 実施例2のキャリアBの調整において、酸化スズでコー
トした硫酸バリウム(平均径;2μm)を酸化スズでコ
ートした硫酸バリウム(平均径;0.3μm)に変えた
以外は実施例2と同様にしてキャリアCを得た。The film thickness of the resin coat obtained by calculation was 0.84 μm. (A = 0.84) ≦ (B = 2) ≦ (3.84) (μm) (Comparative Example 1) Carrier C In the preparation of Carrier B of Example 2, barium sulfate coated with tin oxide (average diameter; Carrier C was obtained in the same manner as in Example 2 except that barium sulfate (average diameter; 0.3 μm) coated with tin oxide was used instead of 2 μm).
【0050】計算により得られた樹脂コートの膜厚は
0.84μmであった。 (A=0.84)>(B=0.3)(μm) (比較例2) キャリアD 実施例2のキャリアBの調整において酸化スズでコート
した硫酸バリウム(平均径;2μm)を除いた他は実施
例2と同様にしてキャリアDを得た。The film thickness of the resin coat obtained by the calculation was 0.84 μm. (A = 0.84)> (B = 0.3) (μm) (Comparative Example 2) Carrier D In the preparation of Carrier B of Example 2, barium sulfate coated with tin oxide (average diameter: 2 μm) was removed. A carrier D was obtained in the same manner as in Example 2 except for the above.
【0051】計算により得られた樹脂コートの膜厚は2
μmであった。 (比較例3) キャリアE フェライト粒子(平均粒径;50μm) 100重量部 トルエン 14重量部 スチレンメタクリレート共重合体 0.5重量部 フェライト粒子を除く上記成分をサンドミルで10分間
分散し、被膜層形成液を調合し、更に、この被膜層形成
液とフェライト粒子を真空脱気型ニーダーにいれ、温度
60℃において10分撹拌した後、減圧してトルエンを
留去して、スチレンメタクリレート共重合体からなる被
膜層を形成したキャリアEを得た。The film thickness of the resin coat obtained by the calculation is 2
μm. (Comparative Example 3) Carrier E Ferrite particles (average particle size; 50 μm) 100 parts by weight Toluene 14 parts by weight Styrene methacrylate copolymer 0.5 parts by weight The above components except ferrite particles are dispersed for 10 minutes by a sand mill to form a coating layer. A liquid is prepared, and the coating layer forming liquid and ferrite particles are put into a vacuum degassing type kneader and stirred at a temperature of 60 ° C. for 10 minutes, and then toluene is distilled off under reduced pressure to remove the styrene methacrylate copolymer from the copolymer. A carrier E having a coating layer of
【0052】計算により得られた樹脂コートの膜厚は
0.2μmであった。現像剤の調製 上記実施例1、2および比較例1〜3のキャリアそれぞ
れ100重量部を、下記の製造方法で作成した平均粒径
8μmのトナーA(マゼンタトナー)6重量部と混合し
て5種類の現像剤を調整した。得られた現像剤をそれぞ
れ現像剤1〜5とした。 トナーA 線状ポリエステル樹脂 100重量% (テレフタル酸/ビスフェノールA エチレンオキサイド付加物/ シクロヘキサンジメタノールから得られた線状ポリエステル; Tg=62℃、Mn=4,000、Mw=35,000、 酸価=12、水酸価=25) マゼンタ顔料(C.I.ピグメント レッド57) 3重量% 上記混合物をエクストルーダーで混練し、ジェットミル
で粉砕した後、風力式分級機で分散してd50=8μm
のマゼンタトナー粒子を得た。画像形成 これらの現像剤1〜5を使用して、電子写真複写機
(A−Color630、富士ゼロックス(株)製)に
よって、下記の項目についてコピーテストを行った。The film thickness of the resin coat obtained by the calculation was 0.2 μm. Preparation of Developer 100 parts by weight of each of the carriers of Examples 1 and 2 and Comparative Examples 1 to 3 were mixed with 6 parts by weight of a toner A (magenta toner) having an average particle diameter of 8 μm prepared by the following manufacturing method, and mixed. Different types of developers were prepared. The obtained developers are referred to as developers 1 to 5, respectively. Toner A linear polyester resin 100% by weight (linear polyester obtained from terephthalic acid / bisphenol A ethylene oxide adduct / cyclohexanedimethanol; Tg = 62 ° C., Mn = 4,000, Mw = 35,000, acid value = 12, hydroxyl value = 25) Magenta pigment (CI Pigment Red 57) 3% by weight The above mixture was kneaded with an extruder, pulverized with a jet mill, and then dispersed with a wind classifier to obtain d50 = 8 μm.
Magenta toner particles were obtained. Image formation An electrophotographic copying machine using these developers 1 to 5
(A-Color 630, manufactured by Fuji Xerox Co., Ltd.), the following items were subjected to a copy test.
【0053】初期画像:中温中湿(22℃55%RH)
において形成された画像を目視で評価し、エッジ効果の
有無を判定した。Initial image: Medium temperature and humidity (22 ° C 55% RH)
The image formed in 1. was visually evaluated to determine the presence or absence of the edge effect.
【0054】複写10枚後トナー帯電量:高温高湿(2
8℃85%RH)、中温中湿(22℃55%RH)、低
温低湿(10℃15%RH)の各雰囲気下でコピーを1
0枚作成した後のトナー帯電量(μC/g)を測定し
た。なお、帯電量はCSG(チャージ・スペクトログラ
フ法)の画像解析により測定した値である。Toner charge amount after 10 copies: high temperature and high humidity (2
1 copy under each atmosphere of 8 ℃ 85% RH, medium temperature and humidity (22 ℃ 55% RH), low temperature and low humidity (10 ℃ 15% RH).
The toner charge amount (μC / g) after 0 sheets were prepared was measured. The charge amount is a value measured by image analysis of CSG (charge spectrograph method).
【0055】複写10000枚後トナー帯電量:中温中
湿(22℃55%RH)雰囲気下でコピーを10000
枚作成した後のトナー帯電量をCSG法により測定し
た。Toner charge amount after 10,000 copies: 10,000 copies in an environment of moderate temperature and humidity (22 ° C. 55% RH)
The toner charge amount after the sheet was prepared was measured by the CSG method.
【0056】その結果を下記表1に示す。The results are shown in Table 1 below.
【0057】[0057]
【表1】 [Table 1]
【0058】表1に明らかなように、実施例1、2の静
電潜像現像用キャリアを用いた現像剤1及び2の場合
は、エッジ効果のない良好な画像が得られた。このとき
測定した画像濃度は1〜1.2と安定していた。As is clear from Table 1, in the case of the developers 1 and 2 using the electrostatic latent image developing carriers of Examples 1 and 2, good images having no edge effect were obtained. The image density measured at this time was stable at 1 to 1.2.
【0059】また、高温高湿から低温低湿までの雰囲気
条件に拘らず、トナーの帯電量は安定しており環境によ
る影響を受けにくいことがわかった。さらに、複写10
000枚後のトナー帯電量も初期(複写10枚後)と殆
ど異ならず、安定なトナー帯電量を示しており、耐久性
も良好であることが確認された。It was also found that the toner charge amount is stable and is not easily affected by the environment regardless of the atmospheric conditions from high temperature and high humidity to low temperature and low humidity. Furthermore, copy 10
It was confirmed that the toner charge amount after 000 sheets was almost the same as that at the initial stage (after 10 copies), showed a stable toner charge amount, and had good durability.
【0060】これに対してコート膜厚に対して粒径の小
さい導電性粉末を使用した比較例1のキャリアCを用い
た現像剤3の場合は、トナーの帯電量が低めであり、や
やエッジ効果のある画像が得られた。また、導電性粉末
を含まず、フッ素系樹脂を含有した樹脂コート層を有す
る比較例2のキャリアDを用いた現像剤4の場合は、特
に、中温中湿から低温低湿の雰囲気下で、帯電量がやや
低く、得られた画像にもエッジ効果がはっきりみられ
た。導電性粉末を含まない樹脂コート層を有する比較例
3のキャリアEを用いた現像剤5の場合は、初期にはエ
ッジ効果のない画像が得られたが、複写10000枚後
のトナー帯電量が著しく低下しており、現像剤としての
耐久性に欠けることがわかった。On the other hand, in the case of the developer 3 using the carrier C of Comparative Example 1 in which the conductive powder having a particle diameter smaller than that of the coating film thickness is used, the toner charge amount is low, and the edge is slightly edged. An effective image was obtained. Further, in the case of the developer 4 using the carrier D of Comparative Example 2 which does not contain the conductive powder and has the resin coating layer containing the fluorine-based resin, in particular, the developer is charged under an atmosphere of medium temperature / humidity to low temperature / low humidity. The amount was slightly low, and the edge effect was clearly visible in the obtained image. In the case of the developer 5 using the carrier E of Comparative Example 3 having the resin coating layer containing no conductive powder, an image having no edge effect was initially obtained, but the toner charge amount after 10,000 copies was It was significantly reduced, and it was found that the durability as a developer was lacking.
【0061】[0061]
【発明の効果】本発明の静電潜像現像剤用キャリアは、
上記の構成を有するため、現像剤の帯電性が良好であ
り、中間調再現性の優れた画像を得られ、さらに、長時
間連続的に使用しても、良好な帯電付与能力を維持して
いる。また、この静電潜像現像剤用キャリアを用いた静
電潜像現像剤は、中間調再現性の優れた画像を得られ、
現像剤の耐久性に優れている。本発明の現像剤を用いた
画像形成方法によれば、中間調再現性の優れた画像を、
連続的に得ることができ、連続使用による画像の劣化を
防止しうる。The carrier for an electrostatic latent image developer of the present invention comprises
Because of the above-mentioned constitution, the chargeability of the developer is good, an image having excellent halftone reproducibility can be obtained, and further, even when continuously used for a long time, a good charge imparting ability is maintained. There is. In addition, an electrostatic latent image developer using this carrier for electrostatic latent image developer can obtain an image with excellent halftone reproducibility,
Excellent developer durability. According to the image forming method using the developer of the present invention, an image excellent in halftone reproducibility is obtained.
It can be obtained continuously, and deterioration of the image due to continuous use can be prevented.
Claims (10)
らなる被覆層を有する静電潜像現像剤用キャリアにおい
て、 該導電性粉末の平均一次粒子径を(B)μm、樹脂コー
ト厚みを(A)μmとしたとき、両者の関係が下記式を
満足することを特徴とする静電潜像現像剤用キャリア。 (A)≦(B)≦(A)+3(μm)1. A carrier for an electrostatic latent image developer having a coating layer made of a resin and a conductive powder on a carrier core material, wherein the conductive powder has an average primary particle diameter of (B) μm and a resin coat thickness. (A) A carrier for an electrostatic latent image developer, characterized in that the relationship between them satisfies the following expression, where μm is used. (A) ≦ (B) ≦ (A) +3 (μm)
びシリコーン樹脂からなる群から選択される一種又は二
種以上を含有することを特徴とする請求項1記載の静電
潜像現像用キャリア。2. The electrostatic latent image developing carrier according to claim 1, wherein the resin contains at least one selected from the group consisting of a fluorine resin and a silicone resin.
00μmであることを特徴とする請求項1記載の静電潜
像現像用キャリア。3. The average particle diameter of the carrier core material is 10 to 5
The electrostatic latent image developing carrier according to claim 1, wherein the carrier is 00 μm.
であることを特徴とする請求項1記載の静電潜像現像用
キャリア。4. The resin coat thickness is 0.1 to 10 μm.
2. The carrier for developing an electrostatic latent image according to claim 1, wherein
と、キャリア芯材上に樹脂及び導電性粉末からなる被覆
層を有するキャリアと、からなる静電潜像現像剤におい
て、 該導電性粉末の平均一次粒子径を(B)μm、樹脂コー
ト厚みを(A)μmとしたとき、両者の関係が下記式を
満足することを特徴とする静電潜像現像剤。 (A)≦(B)≦(A)+3(μm)5. An electrostatic latent image developer comprising toner particles composed of a binder resin and a colorant, and a carrier having a coating layer composed of a resin and a conductive powder on a carrier core material. The electrostatic latent image developer is characterized in that, when the average primary particle diameter is (B) μm and the resin coat thickness is (A) μm, the relationship between the two satisfies the following formula. (A) ≦ (B) ≦ (A) +3 (μm)
あることを特徴とする請求項5記載の静電潜像現像剤。6. The electrostatic latent image developer according to claim 5, wherein the toner particles are color toner particles.
脂が、少なくともフッ素系樹脂及びシリコーン樹脂から
なる群から選択される一種又は二種以上を含有すること
を特徴とする請求項5記載の静電潜像現像剤。7. The resin constituting the coating layer of the carrier core material contains at least one kind or two or more kinds selected from the group consisting of a fluorine resin and a silicone resin. Electrostatic latent image developer.
00μmであることを特徴とする請求項5記載の静電潜
像現像剤。8. The average particle size of the carrier core material is 10 to 5
The electrostatic latent image developer according to claim 5, having a size of 00 μm.
であることを特徴とする請求項5記載の静電潜像現像
剤。9. The resin coat thickness is 0.1 to 10 μm.
The electrostatic latent image developer according to claim 5, wherein
該潜像を現像剤を用いて現像する工程と、現像されたト
ナー像を転写体上に転写する工程と、転写体上のトナー
像を加熱定着する工程と、を含む画像形成方法におい
て、 該現像剤として、請求項5に記載の静電潜像現像剤を用
いることを特徴とする画像形成方法。10. A step of forming a latent image on a latent image carrier,
An image forming method comprising: a step of developing the latent image with a developer; a step of transferring the developed toner image onto a transfer body; and a step of heating and fixing the toner image on the transfer body. An image forming method, wherein the electrostatic latent image developer according to claim 5 is used as a developer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32463695A JPH09160304A (en) | 1995-12-13 | 1995-12-13 | Carrier for electrostatic latent image developer, electrostatic latent image developer using that and image forming method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP32463695A JPH09160304A (en) | 1995-12-13 | 1995-12-13 | Carrier for electrostatic latent image developer, electrostatic latent image developer using that and image forming method |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH09160304A true JPH09160304A (en) | 1997-06-20 |
Family
ID=18168048
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP32463695A Pending JPH09160304A (en) | 1995-12-13 | 1995-12-13 | Carrier for electrostatic latent image developer, electrostatic latent image developer using that and image forming method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH09160304A (en) |
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-
1995
- 1995-12-13 JP JP32463695A patent/JPH09160304A/en active Pending
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