JPH07168388A - Non-magnetic one-component development method - Google Patents
Non-magnetic one-component development methodInfo
- Publication number
- JPH07168388A JPH07168388A JP5341174A JP34117493A JPH07168388A JP H07168388 A JPH07168388 A JP H07168388A JP 5341174 A JP5341174 A JP 5341174A JP 34117493 A JP34117493 A JP 34117493A JP H07168388 A JPH07168388 A JP H07168388A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- toner
- component
- developing roller
- developing
- 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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- Developing For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
(57)【要約】
【目的】 本発明の目的は、非接触の非磁性一成分現像
方式において、現像ローラー上で均一なトナー薄層が得
られ、小粒子径の非磁性トナーでも、十分な現像性が得
られる現像方法を提供することにある。
【構成】 非磁性一成分現像剤を現像ローラーに供給
し、層規制部材により該現像剤の薄層を現像ローラーの
表面に形成するとともに電荷を与え、感光体ドラムと現
像ローラーとの電位差により該現像剤を飛翔させ静電潜
像を保持する感光体ドラムに非接触で現像し、ついで転
写材に転写を行う非接触型の非磁性一成分現像方法であ
って、前記非磁性一成分現像剤が、結着剤樹脂と着色剤
を主体とした非磁性トナーに酸化亜鉛を保持したもので
ある非磁性一成分現像方法。
(57) [Summary] [Object] An object of the present invention is to obtain a uniform thin toner layer on a developing roller in a non-contact non-magnetic one-component developing system, and a non-magnetic toner having a small particle size is sufficient. It is to provide a developing method capable of obtaining developability. [Structure] A non-magnetic one-component developer is supplied to a developing roller, a thin layer of the developer is formed on a surface of the developing roller by a layer regulating member, and an electric charge is given to the developing roller by a potential difference between a photosensitive drum and the developing roller. A non-contact type non-magnetic one-component developing method in which a developing agent is non-contactly developed on a photosensitive drum holding an electrostatic latent image by flying the developer and then transferred to a transfer material. Is a non-magnetic one-component developing method in which zinc oxide is held in a non-magnetic toner mainly composed of a binder resin and a colorant.
Description
【０００１】[0001]
【産業上の利用分野】本発明は非磁性トナーを用いて静
電潜像を現像する非接触型の非磁性一成分現像方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type non-magnetic one-component developing method for developing an electrostatic latent image using a non-magnetic toner.
【０００２】[0002]
【従来の技術】一般に電子写真法は感光体上に電気的な
潜像を形成して、ついで該潜像をトナーによって現像
し、必要に応じて紙などの転写材にトナー画像を転写し
た後、加熱、加圧などの手段によって定着し複写物を得
るものである。このような電子写真法に用いられる現像
剤としてはトナーとキャリヤからなる二成分現像剤と、
トナーとキャリヤの機能を同時に備えた一成分現像剤と
がある。一成分現像剤は、さらに磁性一成分現像剤と、
非磁性一成分現像剤に分類される。二成分現像剤は、転
写性、定着性、耐環境特性などの電子写真特性に優れる
反面、トナーとキャリヤの混合比を制御するためのトナ
ー濃度センサーが必要であること、現像剤の寿命が短い
こと、現像剤の攪拌機構が複雑化するなどの問題点を有
する。一方、磁性一成分現像剤は、上記のトナー濃度セ
ンサーが不要であり、現像装置の小型化が容易である反
面、磁性粒子を含むことから、定着性が劣る問題を有す
る。このような背景から装置の小型簡易化と定着特性を
両立するために、近年、非磁性トナーを一成分現像剤と
して用いる方法が提案され、実用化されている。2. Description of the Related Art Generally, in electrophotography, an electric latent image is formed on a photoconductor, the latent image is developed with a toner, and the toner image is transferred to a transfer material such as paper, if necessary. It is fixed by a means such as heating or pressing to obtain a copy. As a developer used in such an electrophotographic method, a two-component developer including a toner and a carrier,
There is a one-component developer that simultaneously has the functions of toner and carrier. The one-component developer further includes a magnetic one-component developer,
Classified as non-magnetic one-component developer. The two-component developer has excellent electrophotographic properties such as transferability, fixability, and environmental resistance, but requires a toner concentration sensor to control the mixing ratio of toner and carrier, and the life of the developer is short. However, there is a problem that the stirring mechanism of the developer becomes complicated. On the other hand, the magnetic one-component developer does not require the toner concentration sensor described above, and the developing device can be easily miniaturized. However, since it contains magnetic particles, it has a problem of poor fixability. From such a background, a method using a non-magnetic toner as a one-component developer has been proposed and put into practical use in recent years in order to achieve both compactness and simplification of the apparatus and fixing characteristics.
【０００３】非磁性トナーを用いる一成分現像方法に
は、現像剤を担持した現像ローラーを静電潜像を有する
感光体と接触させて現像する接触型の非磁性一成分現像
方法と、現像ローラーと感光体の間に一定の空隙ギャッ
プを設けて現像ローラー上の非磁性トナーを飛翔させて
現像する非接触型の非磁性一成分現像方法とがある。接
触型の非磁性一成分現像方法では、現像ローラー上の非
磁性トナーと、静電潜像を有する感光体が接触するため
現像性は良好であるが、その反面、非磁性トナーは現像
装置内だけでなく、感光体ドラムとの間でも摩擦を生ず
るので、非磁性トナーに対する機械的な負担が大きい。
これに対して、非接触型の非磁性一成分現像方法では、
現像剤は層規制部材のみにより摩擦帯電されるため、現
像剤にかかる機械的負担は少ないが、非接触であること
から、接触型と比べて一般的に現像ローラーから感光体
ドラムに飛翔される非磁性一成分現像剤の量（以下、現
像性という）が少量のため十分な画像濃度を得ることが
できないという問題があった。The one-component developing method using a non-magnetic toner includes a contact-type non-magnetic one-component developing method in which a developing roller carrying a developer is brought into contact with a photosensitive member having an electrostatic latent image for development, and a developing roller. There is a non-contact type non-magnetic one-component developing method in which a non-magnetic toner on the developing roller is caused to fly by developing by providing a constant gap between the photosensitive member and the photosensitive member. In the contact-type non-magnetic one-component developing method, the non-magnetic toner on the developing roller and the photoconductor having the electrostatic latent image come into contact with each other, so that the developability is good. Not only this, friction also occurs with the photoconductor drum, so the mechanical load on the non-magnetic toner is large.
On the other hand, in the non-contact type non-magnetic one-component developing method,
Since the developer is triboelectrically charged only by the layer regulation member, the mechanical load on the developer is small, but since it is non-contact, it is generally fly from the developing roller to the photosensitive drum as compared with the contact type. There is a problem that a sufficient image density cannot be obtained because the amount of the non-magnetic one-component developer (hereinafter referred to as the developability) is small.
【０００４】非接触型の非磁性一成分現像法において、
現像性を向上する手段の一つとしては、現像剤である非
磁性トナーの表面に流動化向上剤としての疎水性シリカ
や疎水性アルミナ等を混合付着することにより流動性を
向上し、静電潜像へのトナーの供給量を多くすることが
提案されていた。しかしながら、このような流動化向上
剤は一般的には正または負に強い帯電極性を有する。従
って、非磁性トナーの表面に均一に混合付着させた場合
に、非磁性トナー同志が静電的に反発しあい現像ローラ
ー上で非磁性トナーの均一な薄層が得難いという問題が
あった。また、これとは逆にトナー粒子間での帯電によ
り、正規とは逆の帯電を帯びるトナー粒子が発生し、非
画像部でのカブリ発生の一因となる問題も生じていた。
また、高精細な画像を得るためには、非磁性トナーの粒
子径を例えば体積平均粒子径で１０μｍ以下の小さめに
設定する必要があるが、非磁性トナーの粒子径を小さく
すると摩擦帯電量の上昇や、ファンデルワールス力の相
対的な増加により現像ローラー面への非磁性トナーの付
着力が強くなるため感光体ドラムへ飛翔する量が少なく
なり、現像性がさらに悪くなる問題があった。In the non-contact type non-magnetic one-component developing method,
One of the means for improving the developability is to improve the fluidity by mixing and adhering hydrophobic silica or hydrophobic alumina as a fluidization improver on the surface of the non-magnetic toner which is a developer. It has been proposed to increase the amount of toner supplied to the latent image. However, such fluidization improvers generally have a strong positive or negative charge polarity. Therefore, when the non-magnetic toner is uniformly mixed and adhered to the surface of the non-magnetic toner, the non-magnetic toners electrostatically repel each other and it is difficult to obtain a uniform thin layer of the non-magnetic toner on the developing roller. On the contrary, due to the charging between the toner particles, toner particles having a charge opposite to the normal state are generated, which causes a problem of causing fog in the non-image portion.
Further, in order to obtain a high-definition image, it is necessary to set the particle size of the non-magnetic toner to a small value such as a volume average particle size of 10 μm or less. Since the non-magnetic toner adheres strongly to the surface of the developing roller due to the rise and the relative increase in van der Waals force, the amount of the non-magnetic toner flying to the photosensitive drum is reduced, and there is a problem that the developability is further deteriorated.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、従来におけ
る上記の実状に鑑みてなされたものである。従って、本
発明の目的は、非接触の非磁性一成分現像方式におい
て、現像ローラー上で均一なトナー薄層が得られ、小粒
子径の非磁性トナーでも、十分な現像性が得られる現像
方法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-mentioned conventional circumstances. Therefore, an object of the present invention is to develop a non-contact non-magnetic one-component developing method in which a uniform thin toner layer can be obtained on a developing roller and sufficient developing property can be obtained even with a non-magnetic toner having a small particle size. To provide.
【０００６】[0006]
【課題を解決するための手段】本発明者らは、非接触型
の非磁性一成分現像方法の欠点を解消して、非磁性トナ
ーが小粒子径であっても、良好な現像性を得るための手
段について、鋭意検討した結果、非磁性トナーの後処理
剤として酸化亜鉛を用いることで、上記の目的である現
像ローラー上で均一なトナー薄層が得られ、小粒子径の
トナーであっても良好な現像性を有する非磁性一成分現
像剤を提供できることを見いだし、本発明を完成するに
至った。すなわち、本発明は、非磁性一成分現像剤を現
像ローラーに供給し、層規制部材により該非磁性一成分
現像剤の薄層を現像ローラーの表面に形成するとともに
電荷を与え、感光体ドラムと現像ローラーとの電位差に
より該非磁性一成分現像剤を飛翔させ静電潜像を保持す
る感光体ドラムに非接触で現像し、ついで転写材に転写
を行う非接触型の非磁性一成分現像方法であって、前記
非磁性一成分現像剤が、結着剤樹脂と着色剤を主体とし
た非磁性トナーの表面に酸化亜鉛を保持したものである
ことを特徴とする非磁性一成分現像方法である。The present inventors have solved the drawbacks of the non-contact type non-magnetic one-component developing method and obtained good developability even if the non-magnetic toner has a small particle size. As a result of earnest studies on means for achieving the above, by using zinc oxide as a post-treatment agent for non-magnetic toner, a uniform thin toner layer can be obtained on the developing roller, which is the above-mentioned object, and a toner having a small particle diameter can be obtained. However, they have found that a non-magnetic one-component developer having good developability can be provided, and completed the present invention. That is, according to the present invention, a non-magnetic one-component developer is supplied to a developing roller, a thin layer of the non-magnetic one-component developer is formed on the surface of the developing roller by a layer regulating member, and an electric charge is given to the developing roller and the developing drum. It is a non-contact type non-magnetic one-component developing method in which the non-magnetic one-component developing agent is caused to fly by a potential difference from a roller to develop in a non-contact manner on a photosensitive drum holding an electrostatic latent image, and then transferred to a transfer material. The non-magnetic one-component developing method is characterized in that the non-magnetic one-component developing agent is one in which zinc oxide is held on the surface of a non-magnetic toner mainly composed of a binder resin and a colorant.
【０００７】以下、本発明を図面を参照しながら詳細に
説明する。図１は、本発明の非接触型の非磁性一成分現
像方法に使用する現像装置の概略構成図であり、図中、
１は感光体ドラム、２はホッパー、３は非磁性一成分現
像剤、４は層規制部材、５は現像剤を担持するアルミニ
ウム製スリーブを使用した現像ローラー、６は現像剤の
漏れ防止部材、７は攪拌機を示す。この現像装置におい
ては、感光体ドラム１上には、公知の電子写真法によっ
て静電潜像が形成される。また、ホッパー２内には非磁
性一成分現像剤３が収容されており、この非磁性一成分
現像剤３は層規制部材４によって現像ローラー５上に一
定の層厚になるように担持されるとともに層規制部材４
との摩擦により電荷が付与される。現像ローラー５は、
感光ドラム１と１２０μｍ〜３００μｍの空隙を介して
設置されており、該ローラーには、直流または交流電圧
のバイアスを印加する。現像ローラー５に担持された非
磁性一成分現像剤は、現像ローラー５の回転により搬送
されて、静電潜像を有する感光体ドラム１と現像ローラ
ー５との電位差によって感光体ドラム１表面に飛翔し、
非接触で静電潜像の顕像化が行われる。The present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a developing device used in the non-contact type non-magnetic one-component developing method of the present invention.
1 is a photoconductor drum, 2 is a hopper, 3 is a non-magnetic one-component developer, 4 is a layer regulating member, 5 is a developing roller using an aluminum sleeve carrying the developer, 6 is a developer leakage preventing member, 7 shows a stirrer. In this developing device, an electrostatic latent image is formed on the photosensitive drum 1 by a known electrophotographic method. Further, a non-magnetic one-component developer 3 is accommodated in the hopper 2, and the non-magnetic one-component developer 3 is carried by the layer regulating member 4 on the developing roller 5 so as to have a constant layer thickness. With layer regulation member 4
Electric charge is given by friction with. The developing roller 5 is
It is installed with a gap of 120 μm to 300 μm from the photosensitive drum 1, and a bias of DC or AC voltage is applied to the roller. The non-magnetic one-component developer carried on the developing roller 5 is conveyed by the rotation of the developing roller 5, and is fly to the surface of the photosensitive drum 1 by the potential difference between the photosensitive drum 1 having an electrostatic latent image and the developing roller 5. Then
The electrostatic latent image is visualized without contact.
【０００８】本発明における上記の方法において使用す
る非磁性一成分現像剤を構成する非磁性トナーは、結着
剤樹脂と着色剤を主成分とするものである。結着剤樹脂
としては、例えば、ポリスチレン、ポリエステル、アク
リル樹脂、スチレン−アクリル系共重合体、エチレン−
塩化ビニル系共重合体、エチレン−酢酸ビニル系共重合
体、ポリアミド、ポリエチレン、マレイン酸樹脂、キシ
レン樹脂、フェノール樹脂等があげられるが、これらに
限定されるものではない。また、着色剤としては、例え
ば、カーボンブラック、アセチレンブラック、ランプブ
ラック、チャンネルブラック、アニリンブラック等の黒
色着色剤や、有彩色であればファーナルブルー、パーマ
ネントブルー、ニグロシンブルー、フタロシアニン系シ
アン色顔料、ローズベンガル、キサンチン系マゼンタ色
染料、キナクリドン系マゼンタ色顔料、モノアゾ系赤色
顔料、ジスアゾ系黄色顔料等があげられるが、これらに
限定されるものではない。これら着色剤は、結着剤樹脂
１００重量部に対して１〜１０重量部の範囲で適宜配合
される。上記非磁性トナーには、所望により他の成分、
例えば帯電制御剤、低分子量ポリプロピレン等の添加剤
等を含有させてもよい。非磁性トナーは、体積平均粒子
径で１２μｍ以下、好ましくは、３〜９．５μｍの粒子
径を有するものがよい。体積平均粒子径が３μｍ未満で
あると十分な流動性が得られない。一方、９．５μｍよ
り大きいと細線、文字等の画素の再現性が悪くなる。The non-magnetic toner constituting the non-magnetic one-component developer used in the above method of the present invention contains a binder resin and a colorant as main components. Examples of the binder resin include polystyrene, polyester, acrylic resin, styrene-acrylic copolymer, ethylene-
Examples thereof include, but are not limited to, vinyl chloride-based copolymers, ethylene-vinyl acetate-based copolymers, polyamides, polyethylenes, maleic acid resins, xylene resins, and phenol resins. As the colorant, for example, a black colorant such as carbon black, acetylene black, lamp black, channel black, aniline black, or, if it is a chromatic color, farnal blue, permanent blue, nigrosine blue, phthalocyanine cyan pigment. , Rose bengal, xanthine magenta dye, quinacridone magenta pigment, monoazo red pigment, disazo yellow pigment and the like, but are not limited thereto. These colorants are appropriately mixed in the range of 1 to 10 parts by weight with respect to 100 parts by weight of the binder resin. If desired, other components may be added to the non-magnetic toner.
For example, a charge control agent, an additive such as low molecular weight polypropylene and the like may be contained. The non-magnetic toner has a volume average particle size of 12 μm or less, preferably 3 to 9.5 μm. If the volume average particle diameter is less than 3 μm, sufficient fluidity cannot be obtained. On the other hand, if it is larger than 9.5 μm, the reproducibility of pixels such as thin lines and characters deteriorates.
【０００９】酸化亜鉛の非磁性トナーへの添加量は、非
磁性トナー１００重量部に対して、０．１〜５重量部が
望ましい。０．１重量部より少ないと非磁性トナー粒子
同志および非磁性トナーと現像機との付着力が強く、実
用上十分な画像濃度が得られない。一方、５重量部より
多いと、摩擦帯電量が低すぎて現像ローラー上に良好な
トナー薄層が形成されず、また、現像機からのトナー飛
散が多くなる。また、本発明においては酸化亜鉛の一次
粒子径が０．０１〜０．５μｍであることが好ましい。
酸化亜鉛の１次平均粒子径が０．０１μｍ未満のもので
あると、非磁性トナーへの分散付着性が悪く、０．５μ
ｍを超すものであると、トナー粒子への均一な分散・付
着性は良好であるものの、付着力が弱く、非磁性トナー
粒子から、剥離、分離し易い。非磁性トナーの表面に酸
化亜鉛を遊離した状態で保持させるためには、通常の粉
体用混合機であるヘンシェルミキサー、スーパーミキサ
ー等の混合機を用いて所定の混合比で混合された非磁性
トナーと酸化亜鉛の混合物を攪拌することにより行うこ
とができる。ヘンシェルミキサー、スーパーミキサー等
の粉体混合機を用いる場合には、温和な攪拌条件で比較
的短時間の混合でよい。また、流動性の調整のため、流
動性向上剤である疎水性シリカや疎水性アルミナなどを
該酸化亜鉛と同時に添加することもできる。この場合に
も上記と同様の粉体混合法を用いることが可能である。
なお、本発明においては、非磁性トナー８の表面の酸化
亜鉛９の保持状態は、図２に示す付着状態が好ましい。
このような状態にすることで、上記のようなトナー粒子
同志の静電的な反発や、凝集が低減され、スリーブ上に
良好なトナー薄層を形成することができる。The amount of zinc oxide added to the non-magnetic toner is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the non-magnetic toner. If the amount is less than 0.1 parts by weight, the non-magnetic toner particles and the non-magnetic toner adhere strongly to the developing device, and a practically sufficient image density cannot be obtained. On the other hand, when the amount is more than 5 parts by weight, the triboelectric charge amount is too low to form a good toner thin layer on the developing roller, and the toner scattering from the developing machine increases. Further, in the present invention, the primary particle diameter of zinc oxide is preferably 0.01 to 0.5 μm.
If the primary average particle size of zinc oxide is less than 0.01 μm, the dispersion adhesion to the non-magnetic toner is poor, and the average particle size is 0.5 μm.
When it is more than m, the uniform dispersion and adhesion to the toner particles are good, but the adhesion is weak, and the nonmagnetic toner particles are easily separated and separated. In order to keep zinc oxide in a free state on the surface of the non-magnetic toner, a non-magnetic toner mixed at a predetermined mixing ratio is used by using a mixer such as an ordinary powder mixer such as a Henschel mixer or a super mixer. This can be performed by stirring the mixture of toner and zinc oxide. When a powder mixer such as a Henschel mixer or a super mixer is used, mixing can be performed for a relatively short time under mild stirring conditions. Further, in order to adjust the fluidity, a hydrophobicity improver such as hydrophobic silica or hydrophobic alumina may be added at the same time as the zinc oxide. Also in this case, it is possible to use the same powder mixing method as described above.
Incidentally, in the present invention, the holding state of the zinc oxide 9 on the surface of the non-magnetic toner 8 is preferably the attached state shown in FIG.
In such a state, electrostatic repulsion and aggregation of the toner particles as described above are reduced, and a good toner thin layer can be formed on the sleeve.
【００１０】[0010]
【作用】現像ローラー上で均一なトナー薄層を得るため
には、トナー粒子間での静電的な反発や、トナー粒子間
の帯電によるトナー粒子同志の静電的な凝集を防ぐこと
が必要である。酸化亜鉛を非磁性トナー表面に保持させ
ることにより、上記のようなトナー粒子同志の静電気的
な反発や凝集が低減され、スリーブ上に良好なトナー薄
層を形成することができる。トナー粒子径が小さい場合
には、一般に現像ローラー上での摩擦帯電量が高くな
り、現像性が悪くなる。このような現象に対しても酸化
亜鉛の添加により、摩擦帯電量の低減が可能であり、良
好な現像性を得るための有効な手段となる。また酸化亜
鉛とトナー表面に保持することにより、トナー粒子間お
よびトナー粒子と現像機との接触距離が大きくなり、粒
子間による凝集を防ぐことが可能となり現像性が向上す
る。In order to obtain a uniform thin toner layer on the developing roller, it is necessary to prevent electrostatic repulsion between toner particles and electrostatic aggregation between toner particles due to charging between toner particles. Is. By holding zinc oxide on the surface of the non-magnetic toner, electrostatic repulsion and aggregation of the toner particles as described above can be reduced, and a good toner thin layer can be formed on the sleeve. When the toner particle size is small, the triboelectric charge amount on the developing roller is generally high and the developability is poor. Against such a phenomenon, addition of zinc oxide makes it possible to reduce the triboelectric charge amount, which is an effective means for obtaining good developability. Further, by holding the zinc oxide and the toner on the surface of the toner, the contact distance between the toner particles and the contact distance between the toner particles and the developing device become large, and it becomes possible to prevent agglomeration due to the particles and improve the developability.
【００１１】[0011]
【実施例】以下、実施例に基づき本発明を説明する。な
お、実施例において部とは重量部を示す。 実施例１ 下記の配合で原料の混合、溶融混練、粉砕分級を行い、
体積平均粒子径７．５μｍの非磁性トナーを得た。この
非磁性トナー１００部に酸化亜鉛（三井金属社製 商品
名：パストラン ｔｙｐｅII ２４１０ １次粒子径
０．０２μｍ）を１．０部添加して、ヘンシェルミキサ
ーで２分間攪拌することで、本発明の非磁性一成分現像
剤を得た。 ・スチレンアクリル共重合体樹脂 ９７部 （藤倉化成社製；モノマー組成スチレン／ブチルアクリレート ／ｎ−ブチルメタクリレート＝７８／１８／４、 Ｍｎ；２．９×１０4 ，Ｍｗ；３２．８×１０4 ） ・ポリプロピレンワックス ２部 （三洋化成工業社製 商品名：ビスコール５５０Ｐ） ・カーボンブラック １０部 （キャボット社製 商品名：ＢＰＬ） ・第４級アンモニウム塩 ３部 （オリエント化学工業社製 商品名：ボントロンＰ−５１）EXAMPLES The present invention will be described below based on examples. In the examples, “part” means “part by weight”. Example 1 The raw materials were mixed, melt-kneaded, and pulverized and classified according to the following formulation,
A non-magnetic toner having a volume average particle diameter of 7.5 μm was obtained. To 100 parts of this non-magnetic toner, 1.0 part of zinc oxide (trade name: Pastran type II 2410, primary particle size 0.02 μm, manufactured by Mitsui Kinzoku Co., Ltd.) was added, and the mixture was stirred for 2 minutes with a Henschel mixer. A non-magnetic one-component developer was obtained. -Styrene acrylic copolymer resin 97 parts (manufactured by Fujikura Kasei Co .; monomer composition styrene / butyl acrylate / n-butyl methacrylate = 78/18/4, Mn; 2.9 × 10 4 , Mw; 32.8 × 10 4 ) ・ Polypropylene wax 2 parts (Sanyo Kasei Co., Ltd. product name: Viscol 550P) ・ Carbon black 10 parts (Cabot Co. product name: BPL) ・ Quaternary ammonium salt 3 parts (Orient Chemical Co., Ltd. product name: Bontron) P-51)
【００１２】実施例２ 実施例１の非磁性トナー１００部に酸化亜鉛（三井金属
社製 商品名：パストラン ｔｙｐｅII ２４１０ １
次粒子径０．０２μｍ）を１．０部と疎水性アルミナ
（日本アエロジル社製 商品名：ＲＦＹ−Ｃ）を０．５
部とを同時に添加し、実施例１と同様の混合方法にて、
本発明の非磁性一成分現像剤を得た。Example 2 100 parts of the non-magnetic toner of Example 1 was mixed with zinc oxide (trade name: Pastran type II 2410 1 manufactured by Mitsui Kinzoku Co., Ltd.).
1.0 part of secondary particle diameter 0.02 μm and 0.5 part of hydrophobic alumina (trade name: RFY-C manufactured by Nippon Aerosil Co., Ltd.)
And at the same time, by the same mixing method as in Example 1,
A non-magnetic one-component developer of the present invention was obtained.
【００１３】比較例１ 実施例１の非磁性トナーだけのものを比較用の非磁性一
成分現像剤とした。Comparative Example 1 Only the non-magnetic toner of Example 1 was used as a non-magnetic one-component developer for comparison.
【００１４】比較例２ 実施例１の非磁性トナー１００部に疎水性アルミナ（日
本アエロジル社製 商品名：ＲＦＹ−Ｃ）を０．２５部
を添加し、実施例１と同様の混合方法にて、比較用の非
磁性一成分現像剤を得た。Comparative Example 2 To 100 parts of the non-magnetic toner of Example 1, 0.25 part of hydrophobic alumina (trade name: RFY-C manufactured by Nippon Aerosil Co., Ltd.) was added, and the same mixing method as in Example 1 was used. A non-magnetic one-component developer for comparison was obtained.
【００１５】以上の操作で得られた非磁性一成分現像剤
を用いて、市販の非磁性一成分プリンター（京セラ社製
商品名：Ｌ−８８０）の改造機（現像バイアスを直流
減圧−１００Ｖおよび感光体の表面電位を−９００Ｖに
改造したもの）を用いて、プリントテストを行った。そ
の結果、実施例１、２の非磁性一成分現像剤はいずれも
現像ローラー上に均一なトナー薄層が得られ、また、転
写紙に感光体ドラムから転写された非磁性一成分現像剤
のベタ画像をマクベス反射濃度計で測定すると、実施例
１は１．４０、実施例２は１．４３という良好な画像濃
度が得られ、現像ローラーから感光体ドラムに十分な量
の非磁性一成分現像剤が飛翔されていることが裏付けら
れた。これに対し、比較例１および比較例２の非磁性一
成分現像剤は、現像ローラー上に均一なトナー薄層が得
られず、また摩擦帯電量が高く、ベタ画像をマクベス反
射濃度計で測定すると比較例１は０．７０、比較例２は
０．７５という低い画像濃度であり感光体ドラムへの非
磁性一成分現像剤の飛翔が少量であることが確認され
た。Using the non-magnetic one-component developer obtained by the above operation, a remodeling machine of a commercially available non-magnetic one-component printer (Kyocera product name: L-880) (developing bias at DC decompression of -100 V and A print test was conducted using a photoreceptor whose surface potential was modified to -900V. As a result, in each of the non-magnetic one-component developers of Examples 1 and 2, a uniform thin toner layer was obtained on the developing roller, and the non-magnetic one-component developer transferred from the photosensitive drum to the transfer paper was obtained. When a solid image was measured with a Macbeth reflection densitometer, good image densities of 1.40 in Example 1 and 1.43 in Example 2 were obtained, and a sufficient amount of non-magnetic one component from the developing roller to the photosensitive drum was obtained. This proves that the developer is flying. On the other hand, the non-magnetic one-component developers of Comparative Examples 1 and 2 could not obtain a uniform thin toner layer on the developing roller, had a high triboelectric charge amount, and measured solid images with a Macbeth reflection densitometer. As a result, it was confirmed that Comparative Example 1 had a low image density of 0.70 and Comparative Example 2 had a low image density of 0.75, and the flying amount of the non-magnetic one-component developer onto the photosensitive drum was small.
【００１６】[0016]
【発明の効果】本発明は、上記のように、酸化亜鉛を非
磁性トナー表面に保持させることにより、現像ローラー
上に均一なトナー薄層を得ることができ、かつ非磁性ト
ナーが小粒子径であっても良好な現像性を得ることがで
きる。As described above, according to the present invention, by holding zinc oxide on the surface of the non-magnetic toner, a uniform thin toner layer can be obtained on the developing roller, and the non-magnetic toner has a small particle size. Even in this case, good developability can be obtained.
【図１】本発明を実施するための非接触型の非磁性一成
分現像装置の概略断面図である。FIG. 1 is a schematic cross-sectional view of a non-contact type non-magnetic one-component developing device for carrying out the present invention.
【図２】非磁性トナーの表面に酸化亜鉛が保持された状
態を示す図である。FIG. 2 is a diagram showing a state in which zinc oxide is held on the surface of a non-magnetic toner.
１ 感光体ドラム ２ ホッパー ３ 非磁性一成分現像剤 ４ 層規制部材 ５ 現像ローラー ６ 現像剤の漏れ防止部材 ７ 攪拌機 ８ 非磁性トナー ９ 酸化亜鉛 DESCRIPTION OF SYMBOLS 1 Photoconductor drum 2 Hopper 3 Non-magnetic one-component developer 4 Layer regulating member 5 Developing roller 6 Developer leak prevention member 7 Stirrer 8 Non-magnetic toner 9 Zinc oxide
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０３Ｇ 15/08 ５０４ Ｂ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location G03G 15/08 504 B
Claims (4)
給し、層規制部材により該非磁性一成分現像剤の薄層を
現像ローラーの表面に形成するとともに電荷を与え、感
光体ドラムと現像ローラーとの電位差により該非磁性一
成分現像剤を飛翔させ静電潜像を保持する感光体ドラム
に非接触で現像し、ついで転写材に転写を行う非接触型
の非磁性一成分現像方法であって、前記非磁性一成分現
像剤が、結着剤樹脂と着色剤を主体とした非磁性トナー
の表面に酸化亜鉛を保持したものであることを特徴とす
る非磁性一成分現像方法。1. A non-magnetic one-component developer is supplied to a developing roller, a thin layer of the non-magnetic one-component developer is formed on the surface of the developing roller by a layer regulating member, and an electric charge is applied to the developing roller and the photosensitive drum and the developing roller. A non-contact type non-magnetic one-component developing method in which the non-magnetic one-component developer is caused to fly by a potential difference between The non-magnetic one-component developing method is characterized in that the non-magnetic one-component developing agent is one in which zinc oxide is held on the surface of a non-magnetic toner mainly composed of a binder resin and a colorant.
亜鉛を０．１〜５重量部添加したことを特徴とする請求
項１記載の非磁性一成分現像方法。2. The non-magnetic one-component developing method according to claim 1, wherein 0.1 to 5 parts by weight of zinc oxide is added to 100 parts by weight of the non-magnetic toner.
５μｍであることを特徴とする請求項１記載の非磁性一
成分現像方法。3. The primary particle diameter of zinc oxide is 0.01 to 0.
The non-magnetic one-component developing method according to claim 1, wherein the thickness is 5 μm.
９．５μｍであることを特徴とする請求項１記載の非磁
性一成分現像方法。4. The volume average particle diameter of the non-magnetic toner is 3 to.
The nonmagnetic one-component developing method according to claim 1, wherein the nonmagnetic one-component developing method is 9.5 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5341174A JPH07168388A (en) | 1993-12-13 | 1993-12-13 | Non-magnetic one-component development method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5341174A JPH07168388A (en) | 1993-12-13 | 1993-12-13 | Non-magnetic one-component development method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07168388A true JPH07168388A (en) | 1995-07-04 |
Family
ID=18343923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5341174A Pending JPH07168388A (en) | 1993-12-13 | 1993-12-13 | Non-magnetic one-component development method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07168388A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007121481A (en) * | 2005-10-26 | 2007-05-17 | Seiko Epson Corp | Negatively chargeable toner and method for producing the same |
| JP2007121483A (en) * | 2005-10-26 | 2007-05-17 | Seiko Epson Corp | Negatively chargeable toner and method for producing the same |
| US7374846B2 (en) | 2002-04-11 | 2008-05-20 | Lg Chem, Ltd. | Method for preparing of non-magnetic monocomponent color toner having superior long term stability |
| US7592114B2 (en) | 2005-01-18 | 2009-09-22 | Lg Chem Ltd. | Color toner for non-magnetic mono-component system for increasing printing quality and a method for preparing the same |
| WO2016152525A1 (en) * | 2015-03-24 | 2016-09-29 | 日本ゼオン株式会社 | Toner for developing electrostatic charge images |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62184473A (en) * | 1986-02-10 | 1987-08-12 | Fuji Xerox Co Ltd | Developing method |
| JPH0215288A (en) * | 1988-07-04 | 1990-01-18 | Matsushita Electric Ind Co Ltd | Non-magnetic one-component developing device |
-
1993
- 1993-12-13 JP JP5341174A patent/JPH07168388A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62184473A (en) * | 1986-02-10 | 1987-08-12 | Fuji Xerox Co Ltd | Developing method |
| JPH0215288A (en) * | 1988-07-04 | 1990-01-18 | Matsushita Electric Ind Co Ltd | Non-magnetic one-component developing device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7374846B2 (en) | 2002-04-11 | 2008-05-20 | Lg Chem, Ltd. | Method for preparing of non-magnetic monocomponent color toner having superior long term stability |
| US7592114B2 (en) | 2005-01-18 | 2009-09-22 | Lg Chem Ltd. | Color toner for non-magnetic mono-component system for increasing printing quality and a method for preparing the same |
| JP2007121481A (en) * | 2005-10-26 | 2007-05-17 | Seiko Epson Corp | Negatively chargeable toner and method for producing the same |
| JP2007121483A (en) * | 2005-10-26 | 2007-05-17 | Seiko Epson Corp | Negatively chargeable toner and method for producing the same |
| WO2016152525A1 (en) * | 2015-03-24 | 2016-09-29 | 日本ゼオン株式会社 | Toner for developing electrostatic charge images |
| CN107430361A (en) * | 2015-03-24 | 2017-12-01 | 日本瑞翁株式会社 | Electrostatic image developing toner |
| JPWO2016152525A1 (en) * | 2015-03-24 | 2018-01-18 | 日本ゼオン株式会社 | Toner for electrostatic image development |
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