JPS6252564A - Negative electrostatic chargeability developer - Google Patents
Negative electrostatic chargeability developerInfo
- Publication number
- JPS6252564A JPS6252564A JP60192722A JP19272285A JPS6252564A JP S6252564 A JPS6252564 A JP S6252564A JP 60192722 A JP60192722 A JP 60192722A JP 19272285 A JP19272285 A JP 19272285A JP S6252564 A JPS6252564 A JP S6252564A
- Authority
- JP
- Japan
- Prior art keywords
- developer
- surface treatment
- treatment agent
- silicone oil
- treating agent
- 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.)
- Granted
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
- G03G9/097—Plasticisers; Charge controlling agents
- G03G9/09708—Inorganic compounds
- G03G9/09716—Inorganic compounds treated with organic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の分野）
本発明は、複写機、プリンタ等に用いられる電子写真用
現像剤に関し、より詳細には、流動性に優れ、且つ画像
安定性に優れた正極性の潜像を現像するだめの現像剤に
関する。DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to an electrophotographic developer used in copying machines, printers, etc. This invention relates to a developer for developing a latent image.
（従来技術）
電子写真法は、一般的には、光導電体からなる感光体表
面に静電潜像を形成し、その潜像に現像剤を付与して可
視像化し、必要に応じて転写体に転写、定着して複写物
を得るものである。(Prior art) In general, electrophotography involves forming an electrostatic latent image on the surface of a photoreceptor made of a photoconductor, applying a developer to the latent image to make it visible, and then reproducing it as needed. A copy is obtained by transferring and fixing onto a transfer body.
このような電子写真法に用いられる現像剤としては、定
着用媒質中に着色剤、電荷制御剤等を分散してものを単
独で使用する一成分系現像剤、またはキャリアと混合し
た二成分系現像剤等が知られている。これらの現像剤は
各種の現像方法において、流動性が要求されることから
、現像剤に各種の流動化剤を施すことが提案されている
。また、現像剤の表面特性は、現像剤自体の帯電特性に
も大きく寄与しており、表面処理剤の材質により帯電特
性が決定されるといっても過言ではない。Developers used in such electrophotographic methods include one-component developers in which colorants, charge control agents, etc. are dispersed in a fixing medium, and two-component developers mixed with a carrier. Developers and the like are known. Since these developers are required to have fluidity in various developing methods, it has been proposed to apply various fluidizing agents to the developers. Further, the surface characteristics of the developer greatly contribute to the charging characteristics of the developer itself, and it is no exaggeration to say that the charging characteristics are determined by the material of the surface treatment agent.
従来から、このような表面処理剤としては、シリカ、ア
ルミナ、チタニア等の金属酸化物の他、カーボン等の導
電性物質等が知られているが、いずれも満足し得る結果
は得られていない。例えば、疎水性シリカは、初期にお
いては、流動性に優れた特性を示すが、長期使用におい
ては、シリカに電荷がＭ積され、現像剤同志の静電凝集
を引き起こし、流動性の初期特性を維持させるのが困難
である。アルミナ、チタニアは、電気抵抗が小さく、帯
電性が低いために、現像剤に対する帯電付与性が小さい
。Conventionally, such surface treatment agents include metal oxides such as silica, alumina, and titania, as well as conductive substances such as carbon, but none of these have yielded satisfactory results. . For example, hydrophobic silica initially exhibits excellent fluidity, but when used for a long period of time, charges accumulate on the silica, causing electrostatic aggregation of the developer, which impairs the initial fluidity characteristics. Difficult to maintain. Alumina and titania have low electric resistance and low chargeability, and therefore have low chargeability to the developer.
また、これらの表面処理剤は、粉体粒子への付着性が不
十分で、現像工程中、表面処理剤の脱落が生じ易く、長
期に亘り安定な画像が得られない等の欠点があった。In addition, these surface treatment agents have disadvantages such as insufficient adhesion to powder particles, the surface treatment agent tends to fall off during the development process, and it is not possible to obtain stable images over a long period of time. .
（発明の概要）
本発明者等は上記の現状に対し鋭意研究の結果、表面処
理剤として変性処理されたシリコーンオイルによって、
金属酸化物を被覆処理するとともに、表面処理剤の帯電
量を所定の範囲に制御して粉体表面に保持させることに
より、負帯電性現像剤として流動性に優れ、しかも表面
処理剤の脱落を防止し、画像安定性に優れた負帯電性現
像剤が得られることを知見した。(Summary of the Invention) As a result of intensive research into the above-mentioned current situation, the present inventors have found that using modified silicone oil as a surface treatment agent,
By coating the metal oxide and controlling the amount of charge of the surface treatment agent within a predetermined range so that it is retained on the powder surface, it has excellent fluidity as a negatively charged developer, and also prevents the surface treatment agent from falling off. It has been found that a negatively chargeable developer with excellent image stability can be obtained.
即ち、本発明によれば定着用媒質、着色剤を主体とする
粉体粒子の表面に表面処理剤を担持して成る負帯電性現
像剤において、該表面処理剤がアミノ変性シリコーンオ
イルで処理された金属酸化物であり、そのブローオフ帯
電量が−２５０乃至５０μｃ／ｇであることを特徴とす
る負帯電性現像剤が提供される。That is, according to the present invention, in a negatively charged developer comprising a fixing medium and a surface treatment agent supported on the surface of powder particles mainly containing a colorant, the surface treatment agent is treated with an amino-modified silicone oil. Provided is a negatively chargeable developer, which is a metal oxide having a blow-off charge amount of -250 to 50 μc/g.
通常、負帯電性現像剤用の表面処理剤はそれ自体強い負
帯電性を示すものが多い。しかしながら、帯電性が強い
処理剤は凝集を起こし易く、現像剤表面で電荷の偏りが
起こり、さらに現像剤が凝集する傾向にある。Generally, many surface treatment agents for negatively chargeable developers themselves exhibit strong negative chargeability. However, processing agents with strong electrostatic properties tend to cause aggregation, resulting in uneven charge on the surface of the developer and further aggregation of the developer.
本発明によれば、金属酸化物をア゛ミノ変性シリ、コー
ンオイルで被覆処理することによって、表面処理剤とし
ての金泥酸化物の帯電量を良好な範囲に制御することが
できる。このようにしてアミノ変性シリコーンオイルに
よって被覆処理された金属酸化物のうち、ブローオフ帯
電量が−２５０乃至５０μｃ／ｇ、好ましくは−２００
乃至３０μｃ／ｇのものを表面処理剤とし用いることに
より、負帯電性現像剤として優れた流動性、画像安定性
を付与することが可能となる。しかも、このようにオイ
ル処理された金属酸化物が粉体組成物との付着性におい
ても優れた効果を示すことも大きな特徴である。この付
着性が良好な理由は、被覆処理された金属酸化物の表面
に存在する電子供与性のアミノ基（−Ｎｉ＋、）が粉体
組成物の粒子表面に存在する負極性部に強（保持される
為と考えられる。表面処理剤のブローオフ帯電量が、−
２５０μｃ／ｇよりさらに負側であると、表面処理剤自
体の凝集性によって現像剤の流動性が低下し、安定な画
像が得られない。一方５０μｃ／ｇよりもさらに正側で
あると、現像剤としての負帯電性が極端に低下し、良好
な画像を得ることができない。According to the present invention, by coating the metal oxide with aimino-modified silica or corn oil, the amount of charge of the gold mud oxide as a surface treatment agent can be controlled within a favorable range. The blow-off charge amount of the metal oxide coated with the amino-modified silicone oil is -250 to 50 μc/g, preferably -200 μc/g.
By using a surface treatment agent having a concentration of 30 μc/g to 30 μc/g, it becomes possible to impart excellent fluidity and image stability as a negatively chargeable developer. Moreover, a major feature of the oil-treated metal oxide is that it exhibits excellent adhesion to powder compositions. The reason for this good adhesion is that the electron-donating amino groups (-Ni+,) present on the surface of the coated metal oxide strongly bind (retain) the negative polarity present on the particle surface of the powder composition. This is thought to be because the amount of blow-off charge of the surface treatment agent is -
If it is more negative than 250 μc/g, the fluidity of the developer decreases due to the cohesive nature of the surface treatment agent itself, making it impossible to obtain a stable image. On the other hand, if it is more positive than 50 μc/g, the negative chargeability as a developer will be extremely reduced, making it impossible to obtain a good image.
本発明によれば、表面処理剤によって処理される粉体組
成物自体の帯電量は、定着用媒質等の帯電性によって決
定されるが特に、負帯電性現像剤として考慮すれば、粉
体組成物のブローオフ帯電量は−５乃至−３０μｃ／ｇ
の範囲にあることが望ましい。According to the present invention, the amount of charge of the powder composition itself treated with the surface treatment agent is determined by the chargeability of the fixing medium, etc., but especially when considered as a negatively chargeable developer, the amount of charge of the powder composition itself is determined by the chargeability of the fixing medium etc. The blow-off charge amount of the object is -5 to -30μc/g
It is desirable that it be within the range of .
本発明において用いられる金属酸化物としてはＳｉｎ、
、ＡＩ、０３ 、Ｔｉｅ、等が挙げられ、これらは単独
または組み合わせて用いることができ、特に−次子均粒
径が５０ｍμ以下のものが処理の均一性の点から望まし
い。The metal oxide used in the present invention includes Sin,
, AI, 03, Tie, etc., and these can be used alone or in combination, and those having an average particle diameter of 50 mμ or less are particularly desirable from the viewpoint of uniformity of processing.
本発明において、前述の金属酸化物を被覆するためのア
ミノ変性シリコーンオイルは、一般的シリコーンオイル
のシロキサン結合のうち、側鎖または末端の一部を少な
くとも窒素を含む有機基によって変性したものであり、
次の一般式（１１によっＩ
工 ・−
０−（１）−α
に 一
本発明の表面処理剤の製造にあたっては、金属酸化物に
対し、前述のアミノ変性シリコーンオイルを被覆処理す
る。被覆処理はオイルをトルエン等の溶媒中に溶解し、
金属酸化物を分散させた後に１００〜２００℃の加熱又
は真空処理により乾燥するか、または、金属酸化物に対
し、オイルを噴霧状態で吹きつけることにより得られる
。特に、均一な処理ができることから、溶媒を用いる方
が望ましい。In the present invention, the amino-modified silicone oil for coating the metal oxide described above is a general silicone oil whose siloxane bonds have been modified with at least a portion of the side chain or end thereof by an organic group containing nitrogen. ,
According to the following general formula (11): -0-(1)-α In the production of the surface treatment agent of the present invention, the metal oxide is coated with the above-mentioned amino-modified silicone oil. The treatment involves dissolving the oil in a solvent such as toluene,
It can be obtained by dispersing the metal oxide and then drying it by heating at 100 to 200°C or by vacuum treatment, or by spraying oil onto the metal oxide in a spray state. In particular, it is preferable to use a solvent because it allows for uniform treatment.
この時、表面処理剤の帯電量の制御は、アミノ変性シリ
コーンオイルの持つ電子供与性に基づくもので、分子量
とアミン当量に依存する。アミン当量は分子量を一分子
当りのアミノ基の数で割った値である。At this time, control of the amount of charge of the surface treatment agent is based on the electron donating property of the amino-modified silicone oil, and depends on the molecular weight and amine equivalent. Amine equivalent is the molecular weight divided by the number of amino groups per molecule.
したがって分子量が小さく、アミン当量の小さいもの程
、金属酸化物を正帯電側に移行させる傾向にある。よっ
て、本発明によれば、帯電量を特定の範囲に設定するた
めには、用いる金属酸化物に応じ、溶媒中に熔解させる
オイルの量または、オイルのアミン当量、分子量を適宜
選択することによって行うことができる。Therefore, the smaller the molecular weight and the smaller the amine equivalent, the more the metal oxide tends to be positively charged. Therefore, according to the present invention, in order to set the amount of charge within a specific range, the amount of oil to be dissolved in the solvent, or the amine equivalent and molecular weight of the oil can be appropriately selected depending on the metal oxide used. It can be carried out.
本発明によれば、上述した表面処理剤は、粉体粒子１０
Ｑｆｆｉ１部に対し、０．１乃至２．０重量部、特に０
．２乃至１．５重量部の割合で処理される。表面処理剤
の割合が０．１重量部未満では、表面処理剤としての効
果が得られず、また、帯電量が不十分で、良好な画像を
得ることができない。一方、２．０重量部を超えるとト
ナー表面に担持しきれな（なり、機内汚染を起こす結果
となるとともに、画質の低下、特ににじみ等が発生する
。According to the present invention, the above-mentioned surface treatment agent is applied to powder particles 10
0.1 to 2.0 parts by weight per 1 part of Qffi, especially 0
．． It is treated in a proportion of 2 to 1.5 parts by weight. If the proportion of the surface treatment agent is less than 0.1 parts by weight, the effect as a surface treatment agent will not be obtained, and the amount of charge will be insufficient, making it impossible to obtain a good image. On the other hand, if the amount exceeds 2.0 parts by weight, the toner cannot be fully supported on the surface of the toner, resulting in contamination inside the machine and deterioration of image quality, especially bleeding.
本発明の現像剤は特に負帯電用として用いられるもので
、現像剤の成分である定着用媒質、着色剤等は公知のも
のが適宜選択される。定着用媒質としては、スチレン、
ビニルトルエン、α−メチルスチレン、α−クロルスチ
レン、ビニルナフタレン、ビニルキシレン等のビニル芳
ｉｔｊＭ 単１ 体、アクリル酸、メタクリル酸、エチ
ルアクリレート、メチルメタクリレート、ブチルメタク
リレート、ブチルアクリレート、２−エチルへキシルア
クリレート、２−エチルへキシルメタクリレート等のア
クリル単量体の単独重合体もしくはそれらの共重合体が
使用される。さらにこれらの樹脂に組み合わせ得る単量
体としては、ブタジェン、イソプレン、クロロプレン等
の共役ジオレフィン系単量体や、フマル酸、無水マレイ
ン酸等のエチレン不飽和カルボン酸或いはそのエステル
類の他、酢酸ビニル等のビニルエステル類等を挙げるこ
とができる。The developer of the present invention is particularly used for negative charging, and the components of the developer, such as a fixing medium and colorant, are appropriately selected from known ones. As the fixing medium, styrene,
Vinyl aromatics such as vinyl toluene, α-methylstyrene, α-chlorostyrene, vinylnaphthalene, vinylxylene, acrylic acid, methacrylic acid, ethyl acrylate, methyl methacrylate, butyl methacrylate, butyl acrylate, 2-ethylhexyl Homopolymers of acrylic monomers such as acrylate and 2-ethylhexyl methacrylate or copolymers thereof are used. Furthermore, monomers that can be combined with these resins include conjugated diolefin monomers such as butadiene, isoprene, and chloroprene, ethylenically unsaturated carboxylic acids and their esters such as fumaric acid and maleic anhydride, and acetic acid. Examples include vinyl esters such as vinyl.
また、これらの定着用媒質として、媒質全体当り２乃至
２０重量％の割合で、低分子量ポリプロプレイン、低分
子量ポリエチレン等の低分子量オレフィン樹脂、パラフ
ィンワックス、カルナバロウ等の各種ワックスをオフセ
ント防止剤として加えることも可能である。なお、この
時、これらのオフセット防止剤は、単に前述の樹脂類と
混練することもできるが定着用媒質の重合時に共存させ
て行うこともできる。In addition, as these fixing media, various waxes such as low molecular weight olefin resins such as low molecular weight polyproprene and low molecular weight polyethylene, paraffin wax, and carnauba wax are added as offset prevention agents at a ratio of 2 to 20% by weight based on the entire medium. It is also possible. At this time, these anti-offset agents can be simply kneaded with the above-mentioned resins, or they can be made to coexist during the polymerization of the fixing medium.
着色剤としては、カーボンブラックをはじめ各種の顔料
、染料が使用できる他、−成分系現像剤においては、マ
グネタイト、フ、エライト等の磁性体を現像剤全量に対
し、３０乃至６０重量％の割合で配合することもできる
。Various pigments and dyes such as carbon black can be used as colorants, and in -component type developers, magnetic materials such as magnetite, ferrite, and elite can be used at a ratio of 30 to 60% by weight based on the total amount of the developer. It can also be blended with.
本発明によれば、所望により第４級アンモニウム化合物
の他、ニグロシン、ニグロシン塩基、クリスタルバイオ
レット等の塩基性染料等の電荷制御剤を使用することが
できる。According to the present invention, in addition to the quaternary ammonium compound, charge control agents such as nigrosine, nigrosine base, basic dyes such as crystal violet, etc. can be used if desired.
本発明の現像剤の製造に際しては、定着用媒質、着色剤
等を所定の割合で混合した後、３本ロール、２軸押出法
等により混線を行ない、その後、粉砕、分級を、所望に
より熱処理等を行なうことにより粒径５〜３０μの粉体
組成物を製造する。この粉体組成物に対し、前述した表
面処理剤をスーパーミキサー等によりまぶし処理するこ
とにより、粉体の表面に表面処理剤を担持させることが
できる。In producing the developer of the present invention, after mixing the fixing medium, colorant, etc. in a predetermined ratio, mixing is performed by a three-roll, twin-screw extrusion method, etc., followed by crushing, classification, and heat treatment if desired. By performing the above steps, a powder composition having a particle size of 5 to 30 μm is manufactured. By applying the above-mentioned surface treatment agent to this powder composition using a super mixer or the like, the surface treatment agent can be supported on the surface of the powder.
なお、表面処理剤は粉体表面にはファンデルワーマスカ
なとの静電的引力によって担持されるが、所望によって
は熱処理等によって粉体表面に固着させて担持させるこ
とも可能である。The surface treatment agent is supported on the powder surface by electrostatic attraction with Van der Waa masker, but if desired, it can also be fixed and supported on the powder surface by heat treatment or the like.
本発明を次の例で説明する。The invention is illustrated by the following example.
実施例
スチレン−アクリル樹脂 ５５重量部低分子量ポリ
プロピレン ５ 〃
マグネタイト ４０〃負帯電制御剤
０．５〃
上記処方の混合物を２軸押出機で溶融混練後、ジェット
ミルで粉砕、分級を行ない粒径５〜２０μの粉体組成物
を得た。なお、得られた粉体組成物のブローオフ帯電量
は一１５μｃ／ｇであった。Examples Styrene-acrylic resin 55 parts by weight Low molecular weight polypropylene 5 Magnetite 40 Negative charge control agent
0.5 The mixture of the above formulation was melt-kneaded in a twin-screw extruder, then ground and classified in a jet mill to obtain a powder composition with a particle size of 5 to 20 μm. The blow-off charge amount of the obtained powder composition was -15 μc/g.
得られた粉体組成物について、第２表の組成に従い、表
面処理剤をスーパーミキサーによりまぶし処理を行なっ
た。The obtained powder composition was treated with a surface treatment agent according to the composition shown in Table 2 using a super mixer.
なお、表面処理剤のオイル処理は、第１表のオイルを用
いて、オイル０．５ｇをトルエン１５０＋＋／！に溶か
した溶液中に、第２表の金属酸化物のいずれかの１０ｇ
を分散させた後、１５０℃で加熱乾燥する。For the oil treatment of the surface treatment agent, use the oils listed in Table 1 and add 0.5g of oil to toluene 150++/! 10 g of any of the metal oxides in Table 2 in a solution dissolved in
After dispersing, the mixture is heated and dried at 150°C.
冷却後、ミキサにて凝集した表面処理剤を粉砕後、６０
メツシ゛ユのフルイによって凝集物を取り除いた。After cooling, the agglomerated surface treatment agent was crushed in a mixer, and then
Aggregates were removed by mesh sieving.
なお、表面処理剤の帯電量の測定はブローオフ法に基づ
き、鉄粉（Ｚ−２００、日本鉄粉社製）を恒温湿槽中で
２４時間放置後、鉄粉２９．８５ｇと表面処理剤０．１
５ｇをボトル中で１分間混合した後ブローオフ帯電量測
定機にて測定した。The amount of charge of the surface treatment agent was measured based on the blow-off method. After leaving iron powder (Z-200, manufactured by Nippon Tetsuko Co., Ltd.) in a constant temperature and humidity bath for 24 hours, 29.85 g of iron powder and 0 of the surface treatment agent were measured. .1
After mixing 5 g in a bottle for 1 minute, the amount of charge was measured using a blow-off charge measuring device.
現像剤の帯電量も、上述の測定法と同様にして、鉄粉２
８．５０ｇと現像剤１．５ｇで測定を行なった。The amount of charge on the developer was measured using the same method as described above.
The measurement was carried out using 8.50 g and 1.5 g of developer.
また流動性の測定はパウダーテスタ（ホソカワミクロン
社製）によって安息角を測定した。The fluidity was measured by measuring the angle of repose using a powder tester (manufactured by Hosokawa Micron).
現像剤への付着性は、現像剤を１００メツシユのフルイ
にかけた時、現像剤表面から脱離し、フルイ中に残存し
た表面処理剤の量を目視で判断した。Adhesion to the developer was determined by visually observing the amount of surface treatment agent that was detached from the developer surface and remained in the sieve when the developer was passed through a 100-mesh sieve.
得られた現像剤は、内部に磁石を有するＡＩ製ススリー
ブ上１００〜１５０μの層厚で担持させ、正電荷の潜像
を有するセレン感光体と非接触状態で対面させ、スリー
ブに所定のバイアスおよびパルス電圧を印加させて現像
剤を感光体に飛翔させて現第 １ 表
第２表において、同一の゛金属酸化物に対して、アミノ
変性シリコーンオイルによる被覆したものと、未処理の
ものをそれぞれ並列に記載したが、それらを比較した時
、いずれの金属酸化物においても本発明のものが付着性
、流動性、画質とも優れていることが理解される。The obtained developer was supported in a layer thickness of 100 to 150 μm on an AI sleeve having a magnet inside, and was placed facing a selenium photoreceptor having a positively charged latent image in a non-contact state, and the sleeve was applied with a predetermined bias and In Table 1 and Table 2, the same metal oxide was coated with amino-modified silicone oil and untreated. Although they are described in parallel, when they are compared, it is understood that among all the metal oxides, the one of the present invention is superior in adhesion, fluidity, and image quality.
しかしながら、アミノ変性シリコーンオイルで処理した
金属酸化物を用いたとしても、その添加によって、正側
に移行しすぎると隘１６に示すように現像剤”の帯電量
が低下し、画像低下した。逆に帯電量が本発明の範囲に
ある表面処理剤でもオイル処理されていないもの（Ｎ１
６）はまったく効果はなかった。さらにアミノ変性され
ないシリコーンオイルを用いた場合（Ｎａ１５）ではｌ
１ｋＬ１．２との比較からも明らかなように帯電量は逆
に増大し、ＮＩＬＩ程の効果は得られなかった。However, even if a metal oxide treated with amino-modified silicone oil is used, if the addition of the metal oxide causes the shift to the positive side too much, the charge amount of the developer decreases as shown in Figure 16, resulting in image deterioration. Even if the surface treatment agent has a charge amount within the range of the present invention, it is not treated with oil (N1
6) had no effect at all. Furthermore, when using silicone oil that is not amino-modified (Na15), l
As is clear from the comparison with 1kL1.2, the amount of charge increased on the contrary, and an effect as good as NILI was not obtained.
（発明の効果）
以上、述べたように本発明の現像剤は、表面処理剤に特
定の帯電量を有するアミノ変性シリコーンオイルによっ
て被覆処理された金属酸化物を用いることにより、極め
て安定な負帯電性を付与することができると同時に、流
動性を向上させ、表面処理剤の脱落をも防止することが
できることによって、長期に亘り安定した画像を得るこ
とができる。(Effects of the Invention) As described above, the developer of the present invention has an extremely stable negative charge by using a metal oxide coated with an amino-modified silicone oil having a specific charge amount as a surface treatment agent. It is possible to impart properties, improve fluidity, and prevent the surface treatment agent from falling off, thereby making it possible to obtain stable images over a long period of time.
Claims (2)
に表面処理剤を担持して成る負帯電性現像剤において、
該表面処理剤がアミノ変性シリコーンオイルで処理され
た金属酸化物であり、そのブローオフ帯電量が−２５０
乃至５０μｃ／ｇであることを特徴とする負帯電性現像
剤。(1) In a negatively charged developer comprising a fixing medium and a surface treatment agent supported on the surface of powder particles mainly containing a colorant,
The surface treatment agent is a metal oxide treated with amino-modified silicone oil, and the blow-off charge amount is -250.
A negatively chargeable developer characterized in that the developer has a charge density of 50 μc/g to 50 μc/g.
ＴｉＯ＿２から選ばれる少なくとも１種である特許請求
の範囲第１項記載の負帯電性現像剤。(2) The metal oxide is SiO_2, Al_2O_3,
The negatively chargeable developer according to claim 1, which is at least one selected from TiO_2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60192722A JPH073601B2 (en) | 1985-08-31 | 1985-08-31 | Negatively charged developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60192722A JPH073601B2 (en) | 1985-08-31 | 1985-08-31 | Negatively charged developer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6252564A true JPS6252564A (en) | 1987-03-07 |
| JPH073601B2 JPH073601B2 (en) | 1995-01-18 |
Family
ID=16295973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60192722A Expired - Fee Related JPH073601B2 (en) | 1985-08-31 | 1985-08-31 | Negatively charged developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073601B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758491A (en) * | 1987-07-06 | 1988-07-19 | Eastman Kodak Company | Dry toner and developer composition |
| JPH01232355A (en) * | 1988-03-11 | 1989-09-18 | Mita Ind Co Ltd | Toner for developing electrostatic latent image |
| JPH02108065A (en) * | 1988-10-18 | 1990-04-19 | Canon Inc | Polyester color developer |
| JPH02109058A (en) * | 1988-10-19 | 1990-04-20 | Canon Inc | Electrostatic charge processing developer |
| JPH02259658A (en) * | 1989-03-31 | 1990-10-22 | Tomoegawa Paper Co Ltd | Electrophotographic developer |
| EP0438245A2 (en) * | 1990-01-16 | 1991-07-24 | Nippon Zeon Co., Ltd. | Non-magnetic one-component developer |
| US5215849A (en) * | 1990-01-16 | 1993-06-01 | Nippon Zeon Co., Ltd | Non-magnetic one-component developer |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5387734A (en) * | 1977-01-13 | 1978-08-02 | Ricoh Co Ltd | Electrophotographic magnetic toner |
| JPS5526518A (en) * | 1978-08-15 | 1980-02-26 | Hitachi Metals Ltd | Magnetic toner |
| JPS57196264A (en) * | 1981-05-29 | 1982-12-02 | Mita Ind Co Ltd | One component type developer |
| JPS5860754A (en) * | 1981-10-08 | 1983-04-11 | Canon Inc | Electrostatic image developer |
| JPS59123854A (en) * | 1982-12-28 | 1984-07-17 | Toshiba Corp | Particle to be added to developer and its manufacture |
| JPS59201063A (en) * | 1983-04-28 | 1984-11-14 | Canon Inc | Developer |
| JPS602962A (en) * | 1983-06-20 | 1985-01-09 | Canon Inc | One component type magnetic toner |
-
1985
- 1985-08-31 JP JP60192722A patent/JPH073601B2/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5387734A (en) * | 1977-01-13 | 1978-08-02 | Ricoh Co Ltd | Electrophotographic magnetic toner |
| JPS5526518A (en) * | 1978-08-15 | 1980-02-26 | Hitachi Metals Ltd | Magnetic toner |
| JPS57196264A (en) * | 1981-05-29 | 1982-12-02 | Mita Ind Co Ltd | One component type developer |
| JPS5860754A (en) * | 1981-10-08 | 1983-04-11 | Canon Inc | Electrostatic image developer |
| JPS59123854A (en) * | 1982-12-28 | 1984-07-17 | Toshiba Corp | Particle to be added to developer and its manufacture |
| JPS59201063A (en) * | 1983-04-28 | 1984-11-14 | Canon Inc | Developer |
| JPS602962A (en) * | 1983-06-20 | 1985-01-09 | Canon Inc | One component type magnetic toner |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4758491A (en) * | 1987-07-06 | 1988-07-19 | Eastman Kodak Company | Dry toner and developer composition |
| JPH01232355A (en) * | 1988-03-11 | 1989-09-18 | Mita Ind Co Ltd | Toner for developing electrostatic latent image |
| JPH02108065A (en) * | 1988-10-18 | 1990-04-19 | Canon Inc | Polyester color developer |
| JPH02109058A (en) * | 1988-10-19 | 1990-04-20 | Canon Inc | Electrostatic charge processing developer |
| JPH02259658A (en) * | 1989-03-31 | 1990-10-22 | Tomoegawa Paper Co Ltd | Electrophotographic developer |
| EP0438245A2 (en) * | 1990-01-16 | 1991-07-24 | Nippon Zeon Co., Ltd. | Non-magnetic one-component developer |
| US5215849A (en) * | 1990-01-16 | 1993-06-01 | Nippon Zeon Co., Ltd | Non-magnetic one-component developer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH073601B2 (en) | 1995-01-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |