JP3560112B2 - Charge control agent for electrostatic image development, and toner and charge providing material using the same - Google Patents

Charge control agent for electrostatic image development, and toner and charge providing material using the same Download PDF

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Publication number
JP3560112B2
JP3560112B2 JP31620696A JP31620696A JP3560112B2 JP 3560112 B2 JP3560112 B2 JP 3560112B2 JP 31620696 A JP31620696 A JP 31620696A JP 31620696 A JP31620696 A JP 31620696A JP 3560112 B2 JP3560112 B2 JP 3560112B2
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Prior art keywords
toner
charge
control agent
charge control
resin
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JPH10161350A (en
Inventor
徳明 高橋
修 安藤
恭子 遠藤
昌子 竹内
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Mitsubishi Chemical Corp
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Mitsubishi Chemical Corp
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Description

【0001】
【発明の属する技術分野】
本発明は電子複写機等に使用される静電荷像現像用帯電制御剤、並びに、それを用いたトナーおよび静電荷像の現像に用いるトナーに電荷を付与する電荷付与材に関するものである。
【0002】
【従来の技術】
電子複写機等で使用される現像剤は、その現像工程において、例えば静電荷像が形成されている感光体等の像担持体に一旦付着せしめられ、次に転写工程において感光体から転写紙に転写された後、定着工程においてコピー紙面に定着される。その際、潜像保持面上に形成される静電荷像を現像するための現像剤として、キャリアとトナーとから成る二成分系現像剤およびキャリアを必要としない一成分系現像剤(磁性トナーまたは非磁性トナー)が知られている。
【0003】
ところで、トナーに要求される重要な特性の1つに帯電性が挙げられる。すなわち、キャリア、現像槽の器壁、現像スリーブまたは層形成ブレード等との接触により、正または負の適度なレベルの帯電を生じること、およびその帯電レベルが、連続使用時や悪影響下においても経時的にほぼ安定していることが要求される。トナーに帯電性を付与するには、樹脂または着色剤自体で行ってもよいが、充分な帯電性が得られにくい。そこで、従来よりトナーに帯電性を付与するもの(帯電制御剤)として、正帯電性のニグロシン系染料、第4級アンモニウム塩、負帯電性の含金属モノアゾ染料、サリチル酸金属錯体、銅フタロシアニン顔料等をトナーに含有させることが知られていた。
【0004】
【発明が解決しようとする課題】
ところで、これら従来の帯電制御剤は、帯電性付与特性およびその他のトナー要求特性の面で、いくつかの課題をかかえている。その1つには、トナーの安全性が挙げられる。従来の帯電制御剤、特に負帯電制御剤は、例えば、クロムの様な金属を含有する含金属染料タイプが、付与する帯電レベルが高いということで、ほとんどを占めている。ところが、トナーという極めて人体に近い場所で使用される物質の成分として、クロムの様に安全性に疑問のある金属は、使用しないことが好ましい。特に近年、こうした安全性を重視する声は高まりつつあり、トナーにおいても、なるべくクロムなどの金属を含有しないで、しかも帯電性付与特性は従来以上に良好で、他のトナー要求特性にも優れた帯電制御剤の開発が望まれている。
【0005】
更にトナーの2つ目の課題点として、帯電安定性が挙げられる。従来の帯電制御剤は、帯電レベルとしては高いものでも、帯電安定性が充分でないものが多く、例えば連続複写、連続印字を行ううちに、帯電レベルが経時的に変化して、コピー汚れを発生するという問題を有している。こうした問題は、特に近年、多数枚を連続的に、しかも高速に処理する複写機等が求められるのにつれ、増大する傾向にあり、より帯電安定性に優れた帯電制御剤の開発が求められている。
【0006】
一方、上記のような帯電制御剤のみでなく、トナーの帯電性の向上は、現像工程中においてトナーと接触するキャリア、現像スリーブ、層形成ブレード等の搬送、規制、あるいは摩擦部材(以下これらを含めて「電荷付与材」といい、現像工程あるいはこれに先だってトナーと接触して、トナーに現像のために必要な電荷を付与し、あるいは電荷を補助的に付与し得る材料ないし部材を総称するものとする。)により行うことも試みられている。この電荷付与材としては、トナーとの摩擦に対して耐久性に富むものが要求され、特にキャリアは長期間交換せずに使用でき得るのが望ましい。
【0007】
【課題を解決するための手段】
そこで、本発明者等はクロムの様な有害な金属を含まなくとも帯電安定性に優れていてコピー汚れ等の発生しにくい高品質の静電荷像現像用トナーを提供し、かつ長期間の使用で性能に劣化がなく、細線再現性および階調性に優れた画像が得られる電荷付与材を提供すべく、鋭意検討を行なった結果、特定の構造を有する化合物を帯電制御剤として用いることにより、これらの課題点が解決されることを見い出し、本発明に到達した。
【0008】
すなわち本発明の目的は、帯電安定性に優れ、他のトナー要求特性、例えば耐湿性、耐光性、耐熱性等にも優れた帯電制御剤を提供することにあり、更には、連続使用時、悪影響下においても、印字濃度が適度で安定し、コピー汚れの発生しにくい電荷付与材および高品質のトナーを提供することにある。また、本発明の目的は、安全性に優れた帯電制御剤を提供することにある。
すなわち、本発明の要旨は、一般式(I)
【0009】
【化2】

Figure 0003560112
【0010】
(式中、Rは水素原子、n価の炭化水素基またはn価の金属を表し、nは1〜4の整数を表す。)で表される化合物であることを特徴とする静電荷像現像用帯電制御剤、樹脂、着色剤、および上記静電荷像現像用帯電制御剤を含有することを特徴とする静電荷像現像用トナー、並びに、上記静電荷像現像用帯電制御剤を少なくとも母材表面の一部に有することを特徴とする静電荷像現像用電荷付与材に存する。
【0011】
【発明の実施の形態】
上記一般式(I)においてRは、水素原子、n価の炭化水素基またはn価の金属を表すが、好ましくは、水素原子、アルキル基、アルキレン基またはn価の金属であり、より好ましくは水素原子、炭素数1〜20のアルキル基、炭素数1〜5のアルキレン基、1価以上4価以下の金属を表し、中でも特に好ましくは、水素原子、炭素数1〜20のアルキル基、1価以上3価以下の金属である。
具体的にアルキル基としてはメチル基、エチル基、n−プロピル基、iso−プロピル基、n−ブチル基、iso−ブチル基、tert−ブチル基、n−ペンチル基、n−ヘキシル基、シクロヘキシル基、n−ヘプチル基、n−オクチル基、2−エチルヘキシル基、ラウリル基、ステアリル基などの直鎖状、分岐鎖状または環状のものが挙げられる。アルキレン基としては、−CH−、−CHCH−、−CHCHCH−などが挙げられる。この他、3価または4価の炭化水素基としてもよい。また、n価の金属(nは1〜4の整数を表す。)としては、Li、Na、K、Mg、Ca、Al、Fe、Co、Ni、Cu、Zn、Baなどが挙げられる。
Rが水素原子の場合、上記一般式(I)で表される化合物はオロチン酸と言われる。
【0012】
次いで、本発明の帯電制御剤をトナーに用いる場合について説明する。
該トナーは少なくとも帯電制御剤、樹脂および着色剤を含有する。
トナーに含有せしめる樹脂としては公知のものを含む広い範囲から選択できる。例えばポリスチレン、ポリクロロスチレン、ポリ−α−メチルスチレン、スチレン−クロロスチレン共重合体、スチレン−プロピレン共重合体、スチレン−ブタジエン共重合体、スチレン−塩化ビニル共重合体、スチレン−酢酸ビニル共重合体、スチレン−マイレン酸共重合体、スチレン−アクリル酸エステル共重合体(スチレン−アクリル酸メチル共重合体、スチレン−アクリル酸エチル共重合体、スチレン−アクリル酸ブチル共重合体、スチレン−アクリル酸オチクル共重合体およびスチレン−アクリル酸フェニル共重合体等)、スチレン−メタクリル酸エステル共重合体(スチレン−メタクリル酸メチル共重合体、スチレン−メタクリル酸エチル共重合体、スチレン−メタクリル酸ブチル共重合体およびスチレン−メタクリル酸フェニル共重合体等)、スチレン−α−クロルアクリル酸メチル共重合体およびスチレン−アクリロニトリル−アクリル酸エステル共重合体等のスチレン系樹脂(スチレンまたはスチレン置換体を含む単重合体または共重合体)、塩化ビニル樹脂、ロジン変性マレイン酸樹脂、フェノール樹脂、エポキシ樹脂、ポリエステル樹脂(飽和、不飽和を含む。)、低分子量ポリエチレン、低分子量ポリプロピレン、アイオノマー樹脂、ポリウレタン樹脂、シリコーン樹脂、ケトン樹脂、エチレン−エチルアクリレート共重合体、キシレン樹脂並びにポリビニルブチラール樹脂等があるが、本発明に用いるに特に好ましい樹脂としてはスチレン−アクリル酸エステル共重合体、スチレン−メタクリル酸エステル共重合体、ポリエステル樹脂およびエポキシ樹脂等を挙げることができる。また、上記樹脂は単独で使用するに限らず2種以上併用することもできる。
【0013】
トナーに含有せしめる着色剤としては、公知のものを含む広い範囲から選択でき、例えば、カーボンブラック、ランプブラック、鉄黒、群青、ニグロシン染料、アニリンブルー、フタロシアニンブルー、フタロシアニングリーン、ハンザイエロー、クロムイエロー、ローズベンガル、トリアリールメタン系染料、モノアゾ系またはジスアゾ系染顔料等を挙げることができる。
【0014】
上記一般式(I)で表される化合物は、白色であり、例えばフルカラー現像に用いられる、青、赤、黄等のカラートナーに含有せしめてもよく、この場合は相当する色調を有する染顔料からなる着色剤を用いる。着色剤の含有率は、樹脂100重量部に対して3〜20重量部とするのが好ましい。
トナーに上記一般式(I)で表される化合物を含有させる方法としては、トナー中に樹脂と共に添加混合する内添方法、トナー粒子を形成後に添加混合する外添方法等が可能であるが、内添方法がより一般的で好ましい。トナー中の上記一般式(I)で表される化合物の含有率は、樹脂100重量部に対して0.1〜20重量部が好ましく、より好ましくは0.1〜15重量部、更に好ましくは0.5〜5重量部である。上記一般式(I)で表される化合物の含有率が、少なすぎると帯電性の向上効果が改善されずにまた過剰であるとトナーの品質が低下するので好ましくない。
【0015】
本発明のトナーには、上記一般式(I)で表される化合物とは別に、公知のものを含めて他の帯電制御剤、例えば、ニグロシン系染料、第4級アンモニウム塩、含金属錯化合物等を含有せしめてもよい。さらに本発明のトナーには、その他公知の添加剤、例えば、固体電解質、高分子電解質、電荷移動錯体、酸化スズ等の金属酸化物等の導電体、半導体あるいは強誘電体、磁性体等を添加しトナーの電気的性質を制御することができる。この他、トナーの中には熱特性、物理特性等を調製する目的で低分子量オレフィン重合体などの各種可塑剤、離型剤等の助剤を添加することも可能である。さらにトナー粒子にTiO、Al、SiO等の微粉末を添加しこれらでトナー粒子表面を被覆せしめることによってトナーの流動性、耐凝集性の向上を図ることができる。
【0016】
本発明の帯電制御剤は特に負帯電性トナーに用いることが好ましい。
トナーの製造法としては、上記の各成分をニーダー等で混練し冷却後、粉砕し分級すればよい。または、カプセル化トナーや重合トナーを採用することもできる。また、本発明のトナーはキャリアと共に用いる二成分系現像剤の他にマグネタイト等の磁性体含有トナー等のいわゆる一成分系現像剤(磁性トナーまたは非磁性トナー)にも適用することができる。トナーの平均粒径は5〜20μmが好適である。
【0017】
本発明のトナーと混合して現像剤を形成するキャリアとしては、公知の鉄粉系、フェライト系、マグネタイト系キャリア等の磁性物質またはそれらの表面に樹脂コーティングを施したものや磁性樹脂キャリアを用いることができる。樹脂コーティングキャリアの被覆樹脂としては一般的に知られているスチレン系樹脂、アクリル系樹脂、スチレンアクリル共重合系樹脂、シリコーン系樹脂、変性シリコーン系樹脂、フッ素系樹脂、またはこれら樹脂の混合物等が利用できるがこれらに限定されるものではない。キャリアの平均粒径は特に制限はないが10〜200μmの平均粒径を有するものが好ましい。これらキャリアは、トナー1重量部に対して、5〜100重量部使用することが好ましい。
【0018】
次に、本発明の帯電制御剤を電荷付与材に用いる場合について説明する。
電荷付与材は、上記一般式(I)で表される化合物を少なくともその表面の一部に有する。
本発明の帯電制御剤を、必要に応じてバインダー樹脂とともに、溶媒あるいは分散媒中に溶解または分散させて得た塗布液を電荷付与材の母材にディッピング、スプレー法、ハケ塗り等によって塗布するか、あるいは母材がキャリア粒子状である場合は、これを上記塗布液に浸せき混合したのち乾燥する方法、あるいは母材との直接混合物の流動化ベッドによる被覆等の方法により、母材上に該帯電制御剤を含有する被覆層を形成させれば本発明の電荷付与材が得られる。また、バインダー樹脂と該帯電制御剤を直接溶融混練し、母材上に押し出しラミネートして電荷付与材を得てもよい。さらに成形可能な樹脂中に該帯電制御剤を含有させ、これをキャリア粒子、現像スリーブあるいは層形成ブレートの形状に成形して電荷付与材としても良い。
【0019】
【実施例】
以下、実施例により本発明を更に詳細に説明する。
なお、下記実施例中単に「部」とあるのはいずれも「重量部」を意味するものとする。
実施例−1
【0020】
【表1】
ポリエステル樹脂(三菱レイヨン社製 FC−023) 100部
カーボンブラック(三菱化学社製 MA−100) 4部
オロチン酸 3部
【0021】
上記の材料を配合混練し、粉砕分級して平均粒径9μmの黒色トナーを得た。このトナー5部と平均粒径約100μmのフェライトキャリア100部とを混合、攪拌して現像剤を作製した。次いでこの現像剤をセレンを感光体とする複写機で実写したところ、鮮明なコピーが得られた。
【0022】
実施例−2
帯電制御剤としてオロチン酸リチウムを3部使用する以外は実施例−1と同様にしたところ、実施例−1と同様に良好なコピーが得られた。
実施例−3
帯電制御剤としてオロチン酸カリウムを3部使用する以外は実施例−1と同様にしたところ、実施例−1と同様に良好なコピーが得られた。
【0023】
実施例−4
帯電制御剤としてオロチン酸亜鉛を3部使用する以外は実施例−1と同様にしたところ、実施例−1と同様に良好なコピーが得られた。
実施例−5
帯電制御剤としてオロチン酸メチルを3部使用する以外は実施例−1と同様にしたところ、実施例−1と同様に良好なコピーが得られた。
【0024】
実施例−6
帯電制御剤としてオロチン酸ブチルを3部使用する以外は実施例−1と同様にしたところ、実施例−1と同様に良好なコピーが得られた。
実施例−7
実施例1〜5と同様にトナーとフェライトキャリアよりなる現像剤を作製し、その10gを20mlサンプルビンに入れ、レシプロシェーカーを使用して混合攪拌を行ない、振とう時間に対する帯電量をブローオフ法を用いて測定した。表にその帯電量を示す。
【0025】
【表2】
Figure 0003560112
【0026】
【発明の効果】
本発明の静電荷像現像用帯電制御剤を用いた静電荷像現像用トナーおよび電荷付与材は安全性に優れ、且つ帯電安定性を有し、連続複写によるコピー汚れの発生しない高品質な静電荷像現像用トナーおよび電荷付与材である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a charge control agent for developing an electrostatic image used in an electronic copying machine or the like, and a charge applying material for applying a charge to a toner using the same and a toner used for developing an electrostatic image.
[0002]
[Prior art]
In a developing process, a developer used in an electronic copying machine or the like is once attached to an image carrier such as a photoconductor on which an electrostatic image is formed, and then is transferred from the photoconductor to transfer paper in a transfer process. After the image is transferred, it is fixed on the copy paper surface in a fixing step. At this time, as a developer for developing an electrostatic charge image formed on the latent image holding surface, a two-component developer composed of a carrier and a toner and a one-component developer not requiring a carrier (magnetic toner or Non-magnetic toner) is known.
[0003]
Incidentally, one of the important characteristics required for the toner is chargeability. That is, an appropriate positive or negative level of charge is generated by contact with the carrier, the vessel wall of the developing tank, the developing sleeve or the layer forming blade, and the level of the charge is aging even during continuous use or under adverse effects. It is required to be almost stable in terms of quality. To impart chargeability to the toner, the resin or the colorant itself may be used, but it is difficult to obtain sufficient chargeability. Conventionally, as a substance that imparts chargeability to toner (charge control agent), a positively chargeable nigrosine dye, a quaternary ammonium salt, a negatively chargeable metal-containing monoazo dye, a salicylic acid metal complex, a copper phthalocyanine pigment, etc. Was known to be contained in the toner.
[0004]
[Problems to be solved by the invention]
By the way, these conventional charge control agents have some problems in terms of chargeability imparting characteristics and other required toner characteristics. One of them is the safety of the toner. Most of conventional charge control agents, particularly negative charge control agents, for example, include metal-containing dyes containing a metal such as chromium, because the applied charge level is high. However, it is preferable not to use a metal, such as chromium, whose safety is questionable, such as chromium, as a component of a substance such as toner, which is used very close to the human body. In particular, in recent years, the importance of such safety has been increasing, and the toner does not contain metal such as chromium as much as possible. Further, the chargeability-imparting property is better than before, and it is excellent in other toner required properties. The development of a charge control agent is desired.
[0005]
A second problem of the toner is charging stability. Conventional charge control agents often have a high charge level but do not have sufficient charge stability.For example, the charge level changes over time during continuous copying and continuous printing, causing copy smearing. Have the problem of Such a problem tends to increase particularly in recent years as a copier or the like that processes a large number of sheets continuously and at a high speed is required, and the development of a charge control agent having more excellent charge stability has been required. I have.
[0006]
On the other hand, in addition to the charge control agent as described above, the improvement of the chargeability of the toner is achieved by transporting, regulating, or using a friction member (hereinafter referred to as a carrier, a developing sleeve, a layer forming blade, etc., which come into contact with the toner during the developing process. The term "charge-imparting material" includes a material or a member capable of applying a charge necessary for development to a toner or contacting the toner in advance in a developing step or prior to the toner. Has been attempted. The charge imparting material is required to have high durability against friction with the toner, and it is particularly desirable that the carrier can be used without replacement for a long period of time.
[0007]
[Means for Solving the Problems]
Therefore, the present inventors have provided a high-quality electrostatic image developing toner which is excellent in charge stability without containing a harmful metal such as chromium and hardly generates copy stains, and is used for a long time. In order to provide a charge-imparting material capable of obtaining an image with excellent fine-line reproducibility and gradation without deteriorating in performance, as a result of intensive studies, the use of a compound having a specific structure as a charge control agent The inventors have found that these problems can be solved and arrived at the present invention.
[0008]
That is, an object of the present invention is to provide a charge control agent that is excellent in charge stability and has other characteristics required by the toner, for example, moisture resistance, light resistance, heat resistance, and the like. An object of the present invention is to provide a charge-imparting material and a high-quality toner, which have an appropriate and stable print density even under an adverse effect, and are less likely to cause copy smear. Another object of the present invention is to provide a charge control agent having excellent safety.
That is, the gist of the present invention is the general formula (I)
[0009]
Embedded image
Figure 0003560112
[0010]
(Wherein, R represents a hydrogen atom, an n-valent hydrocarbon group or an n-valent metal, and n represents an integer of 1 to 4). Charge controlling agent, a resin, a colorant, and a charge controlling agent for developing an electrostatic charge image, the toner for developing an electrostatic charge image, and at least a base material containing the charge controlling agent for developing an electrostatic charge image A charge imparting material for developing an electrostatic charge image, which is provided on a part of the surface.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
In the above general formula (I), R represents a hydrogen atom, an n-valent hydrocarbon group or an n-valent metal, but is preferably a hydrogen atom, an alkyl group, an alkylene group or an n-valent metal, more preferably Represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkylene group having 1 to 5 carbon atoms, a metal having a valence of 1 to 4 and particularly preferably a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, It is a metal having a valence of 3 to 3.
Specific examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an iso-propyl group, an n-butyl group, an iso-butyl group, a tert-butyl group, an n-pentyl group, an n-hexyl group, and a cyclohexyl group. , N-heptyl group, n-octyl group, 2-ethylhexyl group, lauryl group, stearyl group and the like. The alkylene group, -CH 2 -, - CH 2 CH 2 -, - CH 2 CH 2 CH 2 - and the like. In addition, a trivalent or tetravalent hydrocarbon group may be used. Examples of the n-valent metal (n represents an integer of 1 to 4) include Li, Na, K, Mg, Ca, Al, Fe, Co, Ni, Cu, Zn, and Ba.
When R is a hydrogen atom, the compound represented by the above general formula (I) is called orotic acid.
[0012]
Next, a case where the charge control agent of the present invention is used for a toner will be described.
The toner contains at least a charge control agent, a resin and a colorant.
The resin contained in the toner can be selected from a wide range including known resins. For example, polystyrene, polychlorostyrene, poly-α-methylstyrene, styrene-chlorostyrene copolymer, styrene-propylene copolymer, styrene-butadiene copolymer, styrene-vinyl chloride copolymer, styrene-vinyl acetate copolymer Copolymer, styrene-malenic acid copolymer, styrene-acrylate copolymer (styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-acrylic acid Oticle copolymer, styrene-phenyl acrylate copolymer, etc.), styrene-methacrylate copolymer (styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer) Combined and styrene-phenyl methacrylate Styrene resins such as styrene-α-methyl acrylate copolymer and styrene-acrylonitrile-acrylate copolymer (a homopolymer or copolymer containing styrene or a styrene substituent), Vinyl chloride resin, rosin-modified maleic resin, phenol resin, epoxy resin, polyester resin (including saturated and unsaturated), low molecular weight polyethylene, low molecular weight polypropylene, ionomer resin, polyurethane resin, silicone resin, ketone resin, ethylene- Ethyl acrylate copolymers, xylene resins, polyvinyl butyral resins, etc., are particularly preferred for use in the present invention. Styrene-acrylate copolymers, styrene-methacrylate copolymers, polyester resins and epoxy resins It can be mentioned. Further, the above-mentioned resins are not limited to being used alone, and may be used in combination of two or more kinds.
[0013]
The colorant to be contained in the toner can be selected from a wide range including known ones, for example, carbon black, lamp black, iron black, ultramarine, nigrosine dye, aniline blue, phthalocyanine blue, phthalocyanine green, hansa yellow, chrome yellow , Rose bengal, triarylmethane dyes, monoazo or disazo dyes and the like.
[0014]
The compound represented by the general formula (I) is white, and may be contained in, for example, a color toner such as blue, red, and yellow used for full-color development. In this case, a dye or pigment having a corresponding color tone Is used. The content of the colorant is preferably 3 to 20 parts by weight based on 100 parts by weight of the resin.
Examples of the method for incorporating the compound represented by the above general formula (I) into the toner include an internal addition method in which the toner is added and mixed together with the resin, and an external addition method in which the toner particles are added and mixed after formation. The internal addition method is more general and preferred. The content of the compound represented by the general formula (I) in the toner is preferably 0.1 to 20 parts by weight, more preferably 0.1 to 15 parts by weight, and still more preferably 100 parts by weight of the resin. 0.5 to 5 parts by weight. If the content of the compound represented by the general formula (I) is too small, the effect of improving the chargeability is not improved, and if it is excessive, the quality of the toner deteriorates, which is not preferable.
[0015]
In the toner of the present invention, apart from the compound represented by the general formula (I), other charge control agents including known ones, for example, nigrosine dyes, quaternary ammonium salts, metal-containing complex compounds Etc. may be contained. Further, other known additives such as a solid electrolyte, a polymer electrolyte, a charge transfer complex, a conductor such as a metal oxide such as tin oxide, a semiconductor or a ferroelectric, and a magnetic material are added to the toner of the present invention. The electrical properties of the toner can be controlled. In addition, it is also possible to add various plasticizers such as a low-molecular-weight olefin polymer and auxiliaries such as a release agent to the toner for the purpose of adjusting thermal characteristics, physical characteristics, and the like. Further, by adding fine powders such as TiO 2 , Al 2 O 3 , and SiO 2 to the toner particles and coating the toner particles with the fine powders, the fluidity and aggregation resistance of the toner can be improved.
[0016]
The charge control agent of the present invention is particularly preferably used for a negatively chargeable toner.
The toner may be produced by kneading the above components with a kneader, cooling, pulverizing and classifying. Alternatively, an encapsulated toner or a polymerized toner can be employed. The toner of the present invention can be applied to a so-called one-component developer (magnetic toner or non-magnetic toner) such as a toner containing a magnetic substance such as magnetite, in addition to a two-component developer used together with a carrier. The average particle size of the toner is preferably 5 to 20 μm.
[0017]
As a carrier for forming a developer by mixing with the toner of the present invention, a magnetic substance such as a known iron powder-based, ferrite-based, and magnetite-based carrier, or a substance obtained by applying a resin coating on the surface thereof or a magnetic resin carrier is used. be able to. As the coating resin of the resin coating carrier, generally known styrene resin, acrylic resin, styrene acrylic copolymer resin, silicone resin, modified silicone resin, fluorine resin, or a mixture of these resins, etc. Available but not limited to these. The average particle size of the carrier is not particularly limited, but preferably has an average particle size of 10 to 200 μm. These carriers are preferably used in an amount of 5 to 100 parts by weight based on 1 part by weight of the toner.
[0018]
Next, the case where the charge control agent of the present invention is used as a charge imparting material will be described.
The charge imparting material has the compound represented by the general formula (I) on at least a part of its surface.
The charge controlling agent of the present invention, together with a binder resin, if necessary, is coated or coated with a coating solution obtained by dissolving or dispersing in a solvent or dispersion medium by dipping, spraying, brushing, or the like on a base material of the charge imparting material. Or, if the base material is in the form of carrier particles, it is immersed in the above coating solution, mixed and dried, or directly coated with the base material by a fluidized bed by a method such as coating on the base material. The charge imparting material of the present invention can be obtained by forming a coating layer containing the charge control agent. Alternatively, a charge-imparting material may be obtained by directly melting and kneading a binder resin and the charge control agent and extruding and laminating the charge control agent on a base material. Further, the charge control agent may be contained in a moldable resin, and the charge control agent may be formed into a shape of a carrier particle, a developing sleeve or a layer forming plate to be used as a charge imparting material.
[0019]
【Example】
Hereinafter, the present invention will be described in more detail with reference to examples.
In the following examples, “parts” simply means “parts by weight”.
Example-1
[0020]
[Table 1]
100 parts polyester resin (FC-023 manufactured by Mitsubishi Rayon Co.) 4 parts carbon black (MA-100 manufactured by Mitsubishi Chemical Corporation) 4 parts Orotic acid 3 parts
The above-mentioned materials were mixed and kneaded, and pulverized and classified to obtain a black toner having an average particle size of 9 μm. 5 parts of this toner and 100 parts of a ferrite carrier having an average particle size of about 100 μm were mixed and stirred to prepare a developer. Next, when this developer was actually photographed by a copying machine using selenium as a photoreceptor, a clear copy was obtained.
[0022]
Example-2
Example 1 was repeated except that 3 parts of lithium orotate were used as the charge controlling agent, and a good copy was obtained as in Example 1.
Example-3
The same procedures as in Example 1 were carried out except that 3 parts of potassium orotate were used as the charge controlling agent, whereby a good copy was obtained as in Example 1.
[0023]
Example-4
Example 1 was repeated except that 3 parts of zinc orotate were used as the charge controlling agent. As a result, a good copy was obtained as in Example 1.
Example-5
Example 1 was repeated except that 3 parts of methyl orotate were used as a charge controlling agent. As a result, a good copy was obtained as in Example 1.
[0024]
Example-6
Example 1 was repeated except that 3 parts of butyl orotate was used as the charge controlling agent. As a result, a good copy was obtained as in Example 1.
Example-7
A developer composed of a toner and a ferrite carrier was prepared in the same manner as in Examples 1 to 5, 10 g of the developer was placed in a 20-ml sample bottle, mixed and stirred using a reciprocating shaker, and the charge amount with respect to the shaking time was measured by a blow-off method. It measured using. The charge amount is shown in the table.
[0025]
[Table 2]
Figure 0003560112
[0026]
【The invention's effect】
The electrostatic image developing toner and the charge-imparting material using the electrostatic image developing charge control agent of the present invention are excellent in safety, have charging stability, and are high-quality electrostatic images free from copy stains due to continuous copying. A charge image developing toner and a charge providing material.

Claims (4)

一般式(I)
Figure 0003560112
(式中、Rは水素原子、n価の炭化水素基またはn価の金属を表し、nは1〜4の整数を表す。)で表される化合物であることを特徴とする静電荷像現像用帯電制御剤。
General formula (I)
Figure 0003560112
(Wherein, R represents a hydrogen atom, an n-valent hydrocarbon group or an n-valent metal, and n represents an integer of 1 to 4). Charge control agent.
n価の炭化水素基が、アルキル基またはアルキレン基であることを特徴とする請求項1に記載の静電荷像現像用帯電制御剤。2. The charge control agent for developing an electrostatic image according to claim 1, wherein the n-valent hydrocarbon group is an alkyl group or an alkylene group. 樹脂、着色剤および請求項1に記載の静電荷像現像用帯電制御剤を含有することを特徴とする静電荷像現像用トナー。A toner for developing an electrostatic image, comprising: a resin, a colorant, and the charge control agent for developing an electrostatic image according to claim 1. 請求項1に記載の静電荷像現像用帯電制御剤を少なくとも母材表面の一部に有することを特徴とする静電荷像現像用電荷付与材。A charge applying material for developing an electrostatic image, comprising the charge control agent for developing an electrostatic image according to claim 1 on at least a part of the surface of the base material.
JP31620696A 1996-11-27 1996-11-27 Charge control agent for electrostatic image development, and toner and charge providing material using the same Expired - Fee Related JP3560112B2 (en)

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