JP3456025B2 - Method for producing toner for developing electrostatic images - Google Patents

Method for producing toner for developing electrostatic images

Info

Publication number
JP3456025B2
JP3456025B2 JP20699894A JP20699894A JP3456025B2 JP 3456025 B2 JP3456025 B2 JP 3456025B2 JP 20699894 A JP20699894 A JP 20699894A JP 20699894 A JP20699894 A JP 20699894A JP 3456025 B2 JP3456025 B2 JP 3456025B2
Authority
JP
Japan
Prior art keywords
toner
screw
fine powder
kneading
resin
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.)
Expired - Fee Related
Application number
JP20699894A
Other languages
Japanese (ja)
Other versions
JPH0869126A (en
Inventor
幹夫 海野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Chemical Corp
Original Assignee
Mitsubishi Chemical Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Chemical Corp filed Critical Mitsubishi Chemical Corp
Priority to JP20699894A priority Critical patent/JP3456025B2/en
Publication of JPH0869126A publication Critical patent/JPH0869126A/en
Application granted granted Critical
Publication of JP3456025B2 publication Critical patent/JP3456025B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は電子写真法、静電記録等
において使用される静電荷像用トナーの製造方法に関す
るものである。具体的にはトナー微粉をリサイクルして
再利用する静電荷像現像用トナーの製造方法に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electrostatic charge image toner used in electrophotography, electrostatic recording and the like. More specifically, the present invention relates to a method for producing a toner for developing an electrostatic charge image, in which fine toner powder is recycled and reused.

【0002】[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され、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
リアとトナーから成る二成分現像剤及びキャリアを必要
としない一成分現像剤(磁性トナー、非磁性トナー)が
知られている。
2. Description of the Related Art 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 charge image is formed in the developing process, and then is transferred to the photoconductor in the transferring process. After being transferred from the sheet to the transfer sheet, it is fixed on the copy sheet surface in the fixing step. At that time, as a developer for developing the electrostatic charge image formed on the latent image holding surface, a two-component developer consisting of a carrier and a toner and a one-component developer not requiring a carrier (magnetic toner, non-magnetic toner). )It has been known.

【0003】該現像剤に含有されるトナーとしては、正
荷電性トナーと負荷電性トナーがあり、従来より正荷電
性トナーに帯電性を付与するものとしては、ニグロシン
系染料、4級アンモニウム塩等、また負荷電性トナーに
帯電性を付与するものとしては含金染料等の帯電制御剤
やキャリアに所定の帯電性を付与するコーティング剤等
が知られていた。通常行われるトナー製造フローの一例
を図1に示す。まず樹脂と着色剤等の添加物を所定量配
合、混合し、ニーダーで溶融混練し、冷却後粉砕し、分
級する。更に、分級トナーと外添剤を撹拌、混合した
後、粗大物を篩別し、容器に充填する。
Toners contained in the developer include positively chargeable toners and negatively chargeable toners. Conventionally, as those imparting chargeability to positively chargeable toners, nigrosine dyes and quaternary ammonium salts have been used. Further, as a material for imparting chargeability to a negatively chargeable toner, a charge control agent such as a metal-containing dye or a coating agent for imparting a predetermined chargeability to a carrier has been known. An example of a toner manufacturing flow that is normally performed is shown in FIG. First, a resin and additives such as a colorant are blended and mixed in a predetermined amount, melt-kneaded with a kneader, cooled, pulverized, and classified. Further, after the classified toner and the external additive are stirred and mixed, a coarse product is sieved and filled in a container.

【0004】従来、発生したトナー微粉については、特
開平5−34976号公報など記載されている様に環境
面及び生産コスト面などより原料配合・混合工程へ所定
量リサイクルして再利用されていた。しかしながら、従
来のトナー微粉リサイクル方法ではトナー微粉が混練機
で再度溶融混練される際にトナー微粉中樹脂の分子切断
が再度起こり、樹脂の分子量ダウンによるトナーホット
オフセットなどの定着性能の悪化、機械的強度の低下に
よる耐久性能の悪化などを引き起こし好ましくなかっ
た。特に、トナー中の樹脂の分子量ダウンは、架橋成分
を含んだ樹脂、または少なくとも低分子量体と高分子量
体を含んだ分子量のピークを2つ以上有する樹脂等を使
用した場合に顕著に起こりやすい傾向にある。また、ト
ナー微粉が原料に混ざると、微粉を含まない原料に比
し、(a)原料の均一混合がしにくく、トナー組成が不
均一になること、(b)原料の嵩密度が小さくなり連続
的に混練機に原料を供給した時の食い込みが悪化し、ト
ナー生産性が低下し、混練時の負荷がかかりづらくなり
添加物の分散性が不良になること、(c)原料混合した
後の貯蔵・供給容器から連続的に混練機に供給する時に
貯蔵・供給容器内部で原料と微粉の粒度、比重差によ
り、生産過程の途中でトナー組成が不均一になること等
から、ひいてはトナー性能の悪化を招きやすく好ましく
なかった。
Conventionally, the toner fine powder generated has been recycled by recycling a predetermined amount to the raw material blending / mixing process in view of the environment and the production cost, as described in JP-A-5-34976. . However, in the conventional toner fine powder recycling method, when the toner fine powder is melted and kneaded again in the kneader, molecular cutting of the resin in the toner fine powder occurs again, and the fixing performance such as toner hot offset is deteriorated due to the decrease of the molecular weight of the resin, mechanical This is not preferable because it causes deterioration of durability performance due to a decrease in strength. In particular, the decrease in the molecular weight of the resin in the toner tends to occur remarkably when a resin containing a crosslinking component, or a resin having at least two peaks of molecular weight containing a low molecular weight material and a high molecular weight material is used. It is in. Further, when the toner fine powder is mixed with the raw material, it is difficult to uniformly mix the raw material (a) and the toner composition becomes non-uniform, and (b) the bulk density of the raw material becomes smaller than that of the raw material containing no fine powder. When the raw materials are supplied to the kneading machine, the bite is deteriorated, the toner productivity is lowered, the load during the kneading is hard to be applied, and the dispersibility of the additives becomes poor. When the toner is continuously supplied from the storage / supply container to the kneading machine, the toner composition becomes non-uniform during the production process due to the difference in particle size and specific gravity between the raw material and the fine powder inside the storage / supply container. It was not preferable because it was likely to deteriorate.

【0005】特に、近年では(a)複写機等の高速度
化、ファーストコピー時間短縮化などに伴いトナーに使
用されるバインダー樹脂のフロー軟化温度は定着面より
低い温度に設計される為機械的強度が低下し過粉砕され
易く、多量に微粉が発生すること、(b)複写物の高画
質化などに伴いトナーを小粒径化すると、分級効率が低
下し、微粉が従来以上に増加すること等により、トナー
微粉リサイクル量が増加し、トナー性能の劣化なしに生
産性を確保することが難しくなってきた。
In particular, in recent years, (a) the flow softening temperature of the binder resin used for the toner is designed to be lower than the fixing surface due to the increase in speed of the copying machine and the shortening of the first copy time. If the toner has a small particle size due to the decrease in strength, susceptibility to excessive pulverization, a large amount of fine powder, and (b) image quality improvement of the copy, the classification efficiency will decrease and the fine powder will increase more than before. As a result, the amount of recycled toner fine powder has increased, and it has become difficult to ensure productivity without deterioration of toner performance.

【0006】[0006]

【発明が解決しようとする課題】従って、本発明の第1
の目的は樹脂の分子量変化の少ない、定着性能、耐久性
能に優れたトナーの製造方法を提供することにある。第
2の目的はトナー中の添加物の分散性がよく均一な組成
のトナーの製造方法を提供することにある。第3の目的
は環境依存性が少なく、貯蔵安定性に優れたトナーを提
供することにある。第4の目的は連続コピーした場合で
も、画像特性、画像品質、帯電特性等が安定していて、
耐久性能に優れたトナーを提供することにある。第5の
目的はトナー微粉を再利用しても生産性のよいトナー製
造方法を提供することにある。
Therefore, the first aspect of the present invention
It is an object of the invention to provide a method for producing a toner having a small change in the molecular weight of a resin and excellent in fixing performance and durability. A second object is to provide a method for producing a toner having a uniform composition with good dispersibility of additives in the toner. A third object is to provide a toner that has little environmental dependence and is excellent in storage stability. The fourth purpose is that image characteristics, image quality, charging characteristics, etc. are stable even when continuous copying is performed.
It is to provide a toner having excellent durability performance. A fifth object of the present invention is to provide a toner manufacturing method having good productivity even if toner fine powder is reused.

【0007】[0007]

【課題を解決するための手段】本発明者らが種々鋭意検
討した結果、トナー微粉を原料とは別の混練工程で混練
して再利用することでトナー性能が改善できることを見
い出して、本発明に到達した。すなわち、本発明の要旨
は、混練工程aを有するトナー製造工程にトナー微粉を
リサイクルする静電荷像現像用トナーの製造方法におい
て、トナー微粉は送り部スクリュのみから成るスクリュ
を有する連続式押出機で混練する混練工程bを経るとと
もに、該混練工程bを経た混練物として前記混練工程a
以降の工程にリサイクルされることを特徴とする静電荷
像現像用トナーの製造方法に存する。
As a result of various studies by the present inventors, it was found that the toner performance can be improved by kneading and reusing the toner fine powder in a kneading step different from that of the raw material to improve the toner performance. Reached That is, the gist of the present invention is a method for producing a toner for developing an electrostatic image <br/> recycled toner fines toner production process having a kneading step a, the toner fines consists only of the feed unit screw screw
After a kneading step b of kneading with a continuous extruder having
Mostly, the kneading step a as a kneaded product obtained through the kneading step b
The present invention resides in a method for producing a toner for developing an electrostatic charge image, which is recycled in the subsequent steps .

【0008】以下、本発明を詳細に説明する。本発明で
用いる樹脂としてはトナーに適した公知の種類のものが
使用できる。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−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
オクチル共重合体及びスチレン−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
ブチル共重合体及びスチレン−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
重合体及びスチレン−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、ポリエチレン樹
脂、ポリプロピレン樹脂、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樹脂、キシレン樹脂、ポリビニ
ルブチラール樹脂、並びにポリカーボネート樹脂等があ
るが、本発明に用いるのに特に好ましい樹脂としてはス
チレン系樹脂、飽和または不飽和ポリエステル樹脂及び
エポキシ樹脂等を挙げることができる。また、上記樹脂
は単独に使用するに限らず、2種以上併用することもで
きる。
The present invention will be described in detail below. As the resin used in the present invention, known resins suitable for toner can be used. For example, polystyrene, polychlorostyrene, poly-α-methylstyrene, styrene-chlorostyrene copolymer, styrene-propylene copolymer, styrene-butadiene copolymer, styrene-vinyl chloride copolymer, styrene-vinyl acetate copolymer. Polymer, styrene-acrylic acid ester copolymer (styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer and styrene- Phenyl acrylate copolymer, etc.), styrene-methacrylic acid ester copolymer (styrene-methyl methacrylate copolymer, styrene-
Ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-phenyl methacrylate copolymer, etc.), styrene-α-chloromethyl acrylate copolymer, styrene-acrylonitrile-acrylic ester copolymer, etc. Styrene resin (styrene or styrene-substituted homopolymer or copolymer), vinyl chloride resin, rosin-modified maleic acid resin, phenol resin, epoxy resin, polyester resin, polyethylene resin, polypropylene resin, ionomer resin, polyurethane Resins, silicone resins, ketone resins, ethylene-ethyl acrylate copolymer resins, xylene resins, polyvinyl butyral resins, polycarbonate resins and the like are available, but as particularly preferred resins for use in the present invention, styrene resins, saturated resins Others can be mentioned unsaturated polyester resins and epoxy resins. Further, the above resins are not limited to be used alone, but may be used in combination of two or more kinds.

【0009】樹脂のフロー軟化温度(Tm)としては8
0〜150℃がよく、更には90〜140℃が好まし
い。80℃未満では紙への定着温度は低くて良好である
が、ホットオフセットが発生しやすく、またトナーが現
像槽内部で破砕されやすくなり、キャリア表面又はドク
ターブレード等にトナーが固着するスペント現象が発生
し、帯電特性の悪化を引き起こし、ひいては現像剤の耐
久性能の悪化を招き問題がある。また、150℃より高
いと紙への定着温度が高く、またトナー粉砕性が悪い等
の問題がある。
The flow softening temperature (Tm) of the resin is 8
The temperature is preferably 0 to 150 ° C, more preferably 90 to 140 ° C. If the temperature is lower than 80 ° C, the fixing temperature to the paper is low and good, but hot offset is likely to occur, the toner is easily crushed inside the developing tank, and the spent phenomenon in which the toner is fixed to the carrier surface or the doctor blade may occur. However, there is a problem in that the charging characteristics are deteriorated, the charging characteristics are deteriorated, and the durability performance of the developer is deteriorated. On the other hand, if it is higher than 150 ° C., there are problems such as a high fixing temperature on paper and poor toner pulverizability.

【0010】樹脂のガラス転移温度は45℃以上が好ま
しく、45℃未満では40℃の高温で長時間トナーを放
置した場合にトナーの固い凝集或いは固着を招くなど保
存安定性が悪く、また、外添工程でトナー凝集物を生成
し易い、篩別装置のスクリーン、側壁等に付着し凝集物
を生成し易いなどの使用上の問題がある。また、樹脂の
製造は公知の溶液重合、懸濁重合、塊状重合、乳化重合
等により行えばよく、必要に応じ低分子量体と高分子量
体の重合方法は違えてもよい。更に、トナー臭気面より
樹脂中の残存モノマー及び残存溶剤量等の軽沸物成分の
総量は1,000ppm以下、中でも特に500ppm
以下が好ましい。本明細書で使用する樹脂の各試験方法
を以下に説明する。
The glass transition temperature of the resin is preferably 45 ° C. or higher, and when the temperature is lower than 45 ° C., the toner is hard to agglomerate or stick when left at a high temperature of 40 ° C. for a long time, resulting in poor storage stability. There are problems in use, such as easy formation of toner aggregates in the addition step, and easy formation of aggregates on screens, side walls, etc. of the sieving device. The resin may be produced by known solution polymerization, suspension polymerization, bulk polymerization, emulsion polymerization or the like, and the polymerization method of the low molecular weight polymer and the high molecular weight polymer may be different as necessary. Further, from the viewpoint of the odor of the toner, the total amount of light-boiling components such as residual monomer and residual solvent amount in the resin is 1,000 ppm or less, and particularly 500 ppm.
The following are preferred. Each test method of the resin used in the present specification will be described below.

【0011】〔フロー軟化温度(Tm)〕フローテスタ
ー((株)島津製作所社製CFT−500)において、
試料1gをノズル1mm×10mmのダイ、荷重30K
g、予熱時間50℃で5分、昇温速度3℃/分の条件下
で測定を行い、フロー開始から終了までの距離の中間点
の温度を軟化温度とする。 〔ガラス転移温度(Tg)〕示差熱分析計((株)島津
製作所社製DTA−40)において、昇温速度10℃/
分の条件で測定した曲線の転移(変曲)開始部に接線を
引き、その交点温度をガラス転移温度とする。
[Flow Softening Temperature (Tm)] In a flow tester (CFT-500 manufactured by Shimadzu Corporation),
Sample 1g, nozzle 1mm × 10mm die, load 30K
g, a preheating time of 50 ° C. for 5 minutes, and a temperature rise rate of 3 ° C./min. The measurement is performed. [Glass transition temperature (Tg)] In a differential thermal analyzer (DTA-40 manufactured by Shimadzu Corporation), a temperature rising rate of 10 ° C /
A tangent line is drawn at the transition (inflection) start portion of the curve measured under the condition of minutes, and the intersection temperature is taken as the glass transition temperature.

【0012】本発明で用いる着色剤としては、公知の顔
料、染料を用いればよい。例えば、カーボンブラック、
酸化チタン、亜鉛華、アルミナホワイト、炭酸カルシウ
ム、群青、紺青、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G、ローダミン系染料、ク
ロムイエロー、キナクリドン、ベンジジンイエロー、ロ
ーズベンガル、トリアリルメタン系染料、アントラキノ
ン染料、モノアゾ及びジアゾ系染顔料などの着色剤を単
独または2種以上混合して使用できる。着色剤の含有量
は、現像により可視像を形成することができるようトナ
ーを着色するに十分な量あればよく、例えば樹脂100
重量部に対して1〜20重量部、中でも特に3〜15重
量部が好適である。
As the colorant used in the present invention, known pigments and dyes may be used. For example, carbon black,
Titanium oxide, zinc white, alumina white, calcium carbonate, ultramarine blue, navy blue, phthalocyanine blue, phthalocyanine green, Hansa yellow G, rhodamine dye, chrome yellow, quinacridone, benzidine yellow, rose bengal, triallyl methane dye, anthraquinone dye, Colorants such as monoazo and diazo dyes and pigments may be used alone or in combination of two or more. The content of the colorant may be an amount sufficient to color the toner so that a visible image can be formed by development, and for example, resin 100
1 to 20 parts by weight, especially 3 to 15 parts by weight is suitable for the parts by weight.

【0013】更に、公知の正荷電性または負荷電性の帯
電制御剤を単独または併用してトナーに使用してもよ
く、その使用量は所望する帯電量見合いで選定すればよ
く、例えば樹脂100重量部に対して0.05〜10重
量部程度が好ましい。正荷電性帯電制御剤としては、例
えばニグロシン系染料、4級アンモニウム塩系化合物、
トリフェニルメタン系化合物、イミダゾール系化合物、
ポリアミン樹脂などがある。負荷電性帯電制御剤として
は、Cr、Co、Al、Fe等の金属含有アゾ系染料、
サリチル酸金属化合物、アルキルサリチル酸金属化合
物、カーリックスアレーン化合物などがある。更に、必
要に応じてその他内添剤を助剤として単独または併用し
て使用してもよく、例えば公知の離型剤の低分子量オレ
フィン重合体、フィラー等を挙げることができる。
Further, known positively-charged or negatively-charged charge control agents may be used alone or in combination in the toner, and the amount thereof may be selected according to the desired charge amount ratio, for example, resin 100. About 0.05 to 10 parts by weight is preferable with respect to parts by weight. Examples of positively chargeable charge control agents include nigrosine dyes, quaternary ammonium salt compounds,
Triphenylmethane compounds, imidazole compounds,
Examples include polyamine resins. As the negative charge control agent, a metal-containing azo dye such as Cr, Co, Al or Fe,
Examples thereof include metal salicylate compounds, metal alkylsalicylate compounds, and carlix arene compounds. Furthermore, if necessary, other internal additives may be used alone or in combination as an auxiliary agent, and examples thereof include a low molecular weight olefin polymer of a known release agent and a filler.

【0014】本発明のトナー製造フローについて図2〜
4に従い一例を説明するが、その要旨を超えない限り以
下の説明に何等制限されるものではない。まず、バージ
ン材料を用いたトナーの製造工程について説明する。ト
ナー内添剤としては、少なくとも樹脂、着色剤を所定量
秤量して配合し、混合する混合装置の一例としては、ダ
ブルコーン・ミキサー、V型ミキサー、ドラム型ミキサ
ー、スーパーミキサー、ヘンシェルミキサー、ナウター
ミキサー等がある。
The toner manufacturing flow of the present invention is shown in FIGS.
An example will be described in accordance with No. 4, but the invention is not limited to the following description as long as the gist thereof is not exceeded. First, a manufacturing process of a toner using a virgin material will be described. As the toner internal additive, at least a resin and a colorant are weighed and blended in predetermined amounts, and examples of the mixing device include a double cone mixer, a V type mixer, a drum type mixer, a super mixer, a Henschel mixer, and Now. There is a tar mixer.

【0015】次に、混練工程では、バッチ式(例えば、
加圧ニーダー、バンバリィミキサー等)または連続式の
練り機を用いるが、連続生産できる等の優位性から、近
年は1軸または2軸押出機が主流であり、例えば、神戸
製鋼所社製KTK型2軸押出機、東芝機械社製TEM型
2軸押出機、ケイ・シー・ケイ社製2軸押出機、池貝鉄
工社製PCM型2軸押出機、栗山製作所社製2軸押出
機、ブス社製コ・ニーダー等がよい。混練後、トナーは
2本ロール等で圧延され、空冷・水冷等で冷却する冷却
工程を経る。
Next, in the kneading step, a batch type (for example,
A pressure kneader, a Banbury mixer, etc.) or a continuous kneader is used, but in recent years, single-screw or twin-screw extruders have become mainstream because of their superiority in continuous production. For example, KTK manufactured by Kobe Steel Ltd. Type twin screw extruder, TEM type twin screw extruder manufactured by Toshiba Machine Co., Ltd., twin screw extruder manufactured by KCK, PCM type twin screw extruder manufactured by Ikegai Tekko KK, twin screw extruder manufactured by Kuriyama Seisakusho, Bus Co-kneader made by the company is good. After the kneading, the toner is rolled by two rolls or the like, and is subjected to a cooling step of cooling by air cooling, water cooling, or the like.

【0016】次いで、粉砕工程では、クラッシャー、ハ
ンマーミル、フェザーミル等で粗粉砕し、ジェットミ
ル、高速ローター回転式ミル等で細粉砕し、段階的に所
定トナー粒度まで粉砕する。粉砕後、慣性分級方式のエ
ルボジェット、遠心力分級方式のミクロプレックス、D
Sセパレーター等でトナーを分級し、平均粒子径3〜1
5μmのトナーを得る。分級工程で発生したトナー粗粉
は粉砕工程に戻して再利用してもよい。
Next, in the pulverizing step, coarse pulverization is performed by a crusher, hammer mill, feather mill, etc., and fine pulverization is performed by a jet mill, a high-speed rotor rotary mill, etc., and the toner particles are pulverized stepwise. After crushing, inertia classification type elbow jet, centrifugal force classification type microplex, D
The toner is classified with an S separator or the like, and the average particle size is 3 to 1
5 μm toner is obtained. The toner coarse powder generated in the classification step may be returned to the pulverization step and reused.

【0017】更に、トナーに外添処理する場合には、分
級トナーと公知の各種外添剤を所定量配合して、ヘンシ
ェルミキサー、スーパーミキサー等の粉体にせん断力を
与える高速撹拌機などで撹拌・混合するのがよい。この
際、外添機内部で発熱があり、凝集物を生成し易くなる
ので外添機の容器部周囲を水で冷却するなどの手段で温
度調整をする方が好ましく、更には外添機容器内部の材
料温度は樹脂のガラス転移温度より10℃以上低めの管
理温度とすることが好適である。
Further, when the toner is externally added, a classified toner and various known external additives are mixed in a predetermined amount, and a high-speed stirrer such as a Henschel mixer or a super mixer which gives a shearing force to the powder is used. It is better to stir and mix. At this time, since heat is generated inside the external additive machine and aggregates are easily generated, it is preferable to adjust the temperature by means such as cooling the periphery of the container part of the external additive machine with water. The internal material temperature is preferably set to a control temperature which is lower than the glass transition temperature of the resin by 10 ° C. or more.

【0018】外添剤としては公知の無機または有機の各
種外添剤が使用できるが、特にトナーの流動性向上、凝
集性抑制を図る為にチタニア、シリカ、アルミナ、酸化
亜鉛、酸化マグネシウム等の無機微粉末が好適である。
外添剤の混合量は、使用する外添剤及びトナー粒子の平
均粒径、粒度分布などによりことなるが、所望するトナ
ー流動性を得る量がよく、例えばトナー粒子100重量
部に対して0.05〜10重量部、更には0.1〜8重
量部が好適である。混合量が0.01重量部未満では流
動性改善効果がなく、高温での貯蔵安定性能が悪く、ま
た混合量が10重量部より多いと一部遊離した外添剤に
より感光体フイルミングを発生したり、現像槽内部に堆
積し現像剤の帯電機能の劣化等の障害を引き起こし好ま
しくない。
As the external additive, various known inorganic or organic external additives can be used. In particular, titania, silica, alumina, zinc oxide, magnesium oxide and the like are used in order to improve the fluidity of the toner and suppress cohesion. Inorganic fine powder is preferred.
The mixing amount of the external additive depends on the external additive to be used and the average particle size and particle size distribution of the toner particles, but an amount that provides a desired toner fluidity is good, for example, 0 based on 100 parts by weight of the toner particles. It is preferably 0.05 to 10 parts by weight, more preferably 0.1 to 8 parts by weight. If the mixing amount is less than 0.01 parts by weight, there is no fluidity improving effect and the storage stability performance at high temperature is poor, and if the mixing amount is more than 10 parts by weight, a part of the external additive liberated causes photoconductor filming. Or, it is not preferable because it accumulates inside the developing tank and causes troubles such as deterioration of the charging function of the developer.

【0019】また、外添剤は高湿環境下での安定性面よ
り、無機微粉末の場合には公知のシランカップリングな
どの処理剤で疎水化処理されたものがより好ましく、更
に、帯電性を考慮する場合には負荷電性を付与する処理
剤としてはジメチルジクロルシラン、モノオクチルトリ
クロルシラン、ヘキサメチルジシラザン、シリコーンオ
イルなど、正荷電性を付与する処理剤としてはアミノシ
ランなどを使用すればよい。
From the viewpoint of stability in a high-humidity environment, the external additive is preferably an inorganic fine powder which has been subjected to a hydrophobic treatment with a treatment agent such as a known silane coupling agent, and is further charged. When considering the property, dimethyldichlorosilane, monooctyltrichlorosilane, hexamethyldisilazane, silicone oil, etc. are used as the treatment agent that imparts negative chargeability, and aminosilane, etc. is used as the treatment agent that imparts positive chargeability. do it.

【0020】この他、トナー外添剤として抵抗調整、研
磨剤などの目的で、流動性改善用以外の公知のマグネタ
イト、フェライト、導電性チタン、酸化アンチモン、酸
化錫、酸化セリウム、ハイドロタルサイト類化合物、ア
クリルビーズ、シリコーンビーズ、ポリエチレンビーズ
などの微粉末を適量混合してもよく、その混合量はトナ
ー100重量部に対して0.005〜10重量部が好ま
しい。得られたトナーは、キャリアを使用しない1成分
系現像剤(マグネタイト等の磁性物を含有した磁性1成
分トナー、または磁性物を含有しない非磁性1成分トナ
ー)、或いは、鉄粉、フェライト、マグネタイト、磁性
樹脂キャリア等の磁性キャリアと混合した2成分系現像
剤として用いることができる。
In addition, as a toner external additive, magnetite, ferrite, conductive titanium, antimony oxide, tin oxide, cerium oxide, hydrotalcites, etc., which are known for the purpose of adjusting resistance, polishing agents, etc., are used for improving fluidity. An appropriate amount of fine powder such as a compound, acrylic beads, silicone beads, and polyethylene beads may be mixed, and the mixing amount is preferably 0.005 to 10 parts by weight with respect to 100 parts by weight of the toner. The obtained toner is a one-component developer that does not use a carrier (a magnetic one-component toner containing a magnetic substance such as magnetite or a non-magnetic one-component toner containing no magnetic substance), or iron powder, ferrite, or magnetite. , A two-component developer mixed with a magnetic carrier such as a magnetic resin carrier.

【0021】本発明でのトナー微粉の再利用方法は、図
2の例ではトナー微粉を混練工程bに供給した後、次い
でトナーを冷却工程aに供給する。図3の例ではトナー
微粉を混練工程bから冷却工程bと粗粉砕工程bを経て
トナーを微粉砕工程aに供給する。図4の例ではトナー
微粉を混練工程b、冷却工程b、粉砕工程b及び分級工
程bを経てトナーを外添工程aに供給する。混練工程b
で使用される押出機は混練工程aと同じバッチ式または
連続式のものが使用できるが、好ましくは生産性の面よ
り連続式押出機がよい。
In the method of reusing the toner fine powder in the present invention, in the example of FIG. 2, the toner fine powder is supplied to the kneading step b, and then the toner is supplied to the cooling step a. In the example of FIG. 3, the toner fine powder is supplied from the kneading step b to the fine pulverizing step a through the cooling step b and the coarse pulverizing step b. In the example of FIG. 4, the toner fine powder is supplied to the external addition step a through a kneading step b, a cooling step b, a pulverizing step b and a classifying step b. Kneading process b
As the extruder used in step 1, the same batch type or continuous type as in the kneading step a can be used, but a continuous type extruder is preferable in terms of productivity.

【0022】混練工程aで使用する押出機の一例を図5
〜11に示すが、バレルは複数に分割され、その内部に
は電気ヒーター等の加熱手段と冷却配管等の冷却手段を
有しており、温度制御盤によって所望する温度に調節さ
れるものである。バレル内には2軸のスクリュが噛み合
わさって同方向に100〜500rpm程度で高速に回
転するスクリュが設けられている。スクリュの構成は適
時選択することができるが、例えば、図6の様に送り部
スクリュとニーディング部スクリュなどで構成されてい
てもよい。トナー原料混合物はホッパーからスクリュフ
ィーダーにより送り部スクリュに投入され、徐々に予熱
されていき、第1のニーディング部スクリュで強いシェ
アがかかることで主原料自体の自己発熱により原料は分
散され、固体または半溶融状態から溶融状態に変化す
る。更に、後部に第2のニーディング部スクリュを設け
たり、スクリュ形状・構成を変えて、混練物が十分に溶
融する高温状態にすることで樹脂と着色剤などの濡れ性
を向上させることができる。また、混練物が溶融状態に
なる部位より後部に複数のベント口を設けガス抜きする
のがよく、更にはベント口の一部または全部をポンプな
どで真空吸引することにより、混練物の充満状態がよく
なり分散性が向上し、揮発成分の除去効率がよくなり好
ましい。
An example of an extruder used in the kneading step a is shown in FIG.
As shown in FIGS. 11 to 11, the barrel is divided into a plurality of parts, and has a heating means such as an electric heater and a cooling means such as a cooling pipe inside the barrel, and is adjusted to a desired temperature by a temperature control panel. . Inside the barrel, there is provided a screw in which biaxial screws mesh with each other and rotate in the same direction at a high speed of about 100 to 500 rpm. The structure of the screw can be selected at any time, but it may be composed of, for example, a feed screw and a kneading screw as shown in FIG. The toner raw material mixture is fed from the hopper to the feeding screw by the screw feeder and gradually preheated. A strong share is applied to the first kneading screw, so that the raw material is self-heated to disperse the raw material. Or, it changes from a semi-molten state to a molten state. Further, by providing a second kneading portion screw at the rear portion or changing the screw shape and configuration to bring the kneaded material to a high temperature state in which it is sufficiently melted, the wettability of the resin and the colorant can be improved. . Further, it is preferable to provide a plurality of vent ports at the rear of the portion where the kneaded product becomes in a molten state for degassing, and further, by vacuum suctioning a part or all of the vent ports with a pump, etc. Is preferable, the dispersibility is improved, and the removal efficiency of volatile components is improved, which is preferable.

【0023】また、連続式押出機の軸数としては1軸ま
たは2軸がよい。スクリュ条数は2条、3条などから分
散性、生産性、混練温度等を考慮して適時選択すればよ
い。押出機の大きさは、混練物のスクリュ送り部、ニー
ディング部と複数のベント口を十分に配置できるものが
よく、バレル内径をD(mm)とし、原料供給口から出
口までの長さをL(mm)とした場合のL/Dは20以
上、好ましくは25以上がよい。
The number of axes of the continuous extruder is preferably one or two. The number of screw threads may be appropriately selected from 2 or 3 threads in consideration of dispersibility, productivity, kneading temperature and the like. The size of the extruder is preferably such that the kneaded material screw feed part, kneading part and multiple vent ports can be arranged sufficiently, the barrel inner diameter is D (mm), and the length from the raw material supply port to the outlet is set. When L (mm) is set, L / D is 20 or more, preferably 25 or more.

【0024】混練工程bで使用する押出機の一例を図1
2に示すが基本的な構造等は混練工程aで使用する押出
機と同じでよい。但し、トナー微粉を供給して押出機内
部で溶融状態にし、且つトナー微粉の分子切断を抑制す
る為には好ましくはスクリュは送り部スクリュを主に設
ければよく、特には送り部スクリュから成ることが好ま
しく、ベント口を必要に応じ設けてもよい。また、押出
機のL/Dは混練物が十分に溶融される長さを確保すれ
ばよく、トナー微粉の分子切断を小さくする為にL/D
は35以下で、好ましくは30以下がよい。また、スク
リュ軸数は1軸、2軸でもよく、条数も2条、3条でも
よいが、生産性・経済性を考慮するとそれぞれ1軸及び
2条がよい。
An example of an extruder used in the kneading step b is shown in FIG.
Although shown in FIG. 2, the basic structure may be the same as that of the extruder used in the kneading step a. However, in order to supply the toner fine powder to make the inside of the extruder in a molten state and to suppress the molecular cutting of the toner fine powder, preferably the screw is mainly provided with the feed section screw, and particularly the feed section screw is formed. Preferably, a vent port may be provided if necessary. Further, the L / D of the extruder is only required to secure a length such that the kneaded product is sufficiently melted, and in order to reduce the molecular cutting of the toner fine powder, the L / D
Is 35 or less, preferably 30 or less. Further, the number of screw shafts may be one or two, and the number of threads may be two or three, but considering productivity and economic efficiency, one and two threads are preferable.

【0025】更にまた、トナー微粉は主に混練工程bに
戻されて再利用されるが、トナー微粉の一部を原料配合
混合工程aに戻してもよい。また、必要に応じ混練工程
bの前に樹脂やその他の添加剤等の一部とトナー微粉を
配合・混合する工程を設けてもよい。なお、トナー微粉
とは、分級工程で発生する細かい粒子のトナーや捕集装
置で捕集された微細なトナーなどを言い、これに限らず
所望する分級トナーの平均粒子径より、細かい平均粒子
径を有するトナーを総称してトナー微粉と称する。トナ
ーの平均粒子径は市販の粒度分布測定装置で測定すれば
よく、例えば、コールター社のコールターカウンターT
A−IIで測定すればよい。
Further, the toner fine powder is mainly returned to the kneading step b for reuse, but a part of the toner fine powder may be returned to the raw material mixing and mixing step a. Further, if necessary, a step of blending and mixing a part of the resin, other additives, and the fine toner powder may be provided before the kneading step b. Note that the toner fine powder refers to a toner having fine particles generated in a classification step or a fine toner collected by a collecting device, and is not limited to this, and the average particle diameter of a desired classification toner is smaller than the average particle diameter. The toner having the above is collectively referred to as toner fine powder. The average particle size of the toner may be measured with a commercially available particle size distribution measuring device, for example, Coulter Counter T manufactured by Coulter Co.
It may be measured by A-II.

【0026】[0026]

【発明の効果】本発明の静電荷像現像用トナーの製造方
法を用いることにより、多量のトナー微粉でも生産性よ
く且つ効率よく製造工程にリサイクルして再利用するこ
とができ、本発明のトナー微粉を再利用したトナーは性
能劣化が少なく、定着性能が良好で、連続使用時でも画
像・画質特性が安定しており、且つ耐久性能にも優れて
いるので、本発明は多大な工業的利益を提供するもので
ある。
EFFECT OF THE INVENTION By using the method for producing a toner for developing an electrostatic image of the present invention, even a large amount of fine toner powder can be recycled in the production process with good productivity and efficiency, and can be reused. The toner in which fine powder is reused has little performance deterioration, has good fixing performance, has stable image and image quality characteristics even during continuous use, and has excellent durability performance. Is provided.

【0027】[0027]

〔原料配合混合工程a〕[Raw material mixing and mixing step a]

【0028】[0028]

【表1】 ・スチレン/n−ブチルアクリレートの共重合樹脂 100部 (Tm=130℃、Tg=60℃) ・着色剤 カーボンブラックMA−100S(三菱化成(株)) 6部 ・帯電制御剤 ボントロンP−51(オリエント化学工業(株)) 2部 ・低分子量ポリプロピレン 2部 (蒸気圧浸透圧法の数平均分子量=7,500) の主原料を配合し、ナウターミキサーで混合した。 〔混練工程a〕連続式押出機((株)池貝製PCM−4
6)で混練した。押出機の概略図は図5、6に示すもの
と同じとした。
[Table 1] Styrene / n-butyl acrylate copolymer resin 100 parts (Tm = 130 ° C, Tg = 60 ° C) Colorant carbon black MA-100S (Mitsubishi Kasei Co., Ltd.) 6 parts Charge control agent Bontron P-51 (Orient Chemical Industry Co., Ltd.) 2 parts-Low molecular weight polypropylene 2 parts (number average molecular weight of vapor pressure osmometry = 7,500) were mixed and mixed with a Nauta mixer. [Kneading step a] Continuous extruder (PCM-4 manufactured by Ikegai Co., Ltd.)
It was kneaded in 6). The schematic diagram of the extruder was the same as that shown in FIGS.

【0029】[0029]

【表2】・混練機のL(長さ)/D(内径)=35 ・スクリュ軸数:2軸(同方向回転) ・混練物供給量:50kg/Hr[Table 2] L (length) / D (inner diameter) of kneading machine = 35 ・ Number of screw shafts: 2 (rotating in the same direction) ・ Kneaded material supply: 50 kg / Hr

【0030】〔冷却工程a〕ベルトクーラーで冷却し
た。 〔粗粉砕工程a〕ハンマーミルで2mm以下に粗粉砕し
た。 〔混練工程b〕既に製造したトナーより発生したトナー
微粉(平均粒子径4.5μm)を原料として、連続式押
出機((株)池貝製FS−40)で混練した。押出機の
概略図は図12に示すものと同じとした。
[Cooling Step a] Cooling was performed with a belt cooler. [Coarse crushing step a] Coarse crushing to 2 mm or less with a hammer mill. [Kneading Step b] Toner fine powder (average particle diameter 4.5 μm) generated from the toner already manufactured was used as a raw material and kneaded with a continuous extruder (FS-40 manufactured by Ikegai Co., Ltd.). The schematic diagram of the extruder was the same as that shown in FIG.

【0031】[0031]

【表3】・混練機のL(長さ)/D(内径)=25 ・スクリュ軸数:1軸 ・混練物供給量:17kg/Hr[Table 3] L (length) / D (inner diameter) of the kneading machine = 25 ・ Number of screw shafts: 1 shaft ・ Kneaded material supply: 17 kg / Hr

【0032】〔冷却工程b〕ベルトクーラーで冷却し
た。 〔粗粉砕工程b〕ハンマーミルで2mm以下に粗粉砕し
た。 〔微粉砕工程a〕粗粉砕工程aと粗粉砕工程bを経た粗
粉砕物を供給してジェットミルで微粉砕した。 〔分級工程a〕風力分級機で分級し、平均粒子径9μの
黒色トナーを得た。
[Cooling Step b] It was cooled by a belt cooler. [Coarse crushing step b] It was roughly crushed to 2 mm or less with a hammer mill. [Fine pulverizing step a] The coarsely pulverized material obtained through the coarse pulverizing step a and the coarse pulverizing step b was supplied and finely pulverized by a jet mill. [Classification step a] Classification was carried out by an air classifier to obtain a black toner having an average particle size of 9μ.

【0033】〔外添工程a〕黒色トナー100重量部に
対してシリカ粉末(日本アエロジル(株)R972)
0.35部とマグネタイト微粉末(戸田工業(株)EP
T1000)0.2部をヘンシェルミキサーにて外添処
理し、外添トナーを得た。 〔篩別工程a〕外添トナーを100メッシュのスクリー
ンを装着した佐藤式振動篩で篩別した。 〔充填工程a〕今回は省略した。
[External Addition Step a] Silica powder (R972 from Nippon Aerosil Co., Ltd.) based on 100 parts by weight of the black toner.
0.35 parts and magnetite fine powder (Toda Kogyo EP
(T1000) 0.2 part was externally added with a Henschel mixer to obtain an externally added toner. [Sieving Step a] The externally added toner was sieved by a Sato type vibrating screen equipped with a 100 mesh screen. [Filling step a] This step was omitted.

【0034】〔トナーの評価〕該外添トナー4部とメチ
ルシリコーン含有樹脂で表面コートされたCu−Zn−
フェライトキャリア(平均粒径=100μm)96部を
V型混合機で撹拌・混合し現像剤を作製した。本現像剤
をスタート用現像剤とし、外添トナーを補給トナーとし
て、負荷電性有機光半導体の感光体を装着した複写速度
60枚/分の複写機で30,000枚の実写テストを実
施した。更に、得られたトナーの分子量分布を測定する
と共に、複写速度60枚/分見合いの通紙速度で定着試
験を実施し使用温度域を確認した。その結果、本トナー
は、230℃までホットオフセットが発生せず、また3
0,000枚実写後のトナー飛散量が少なく、定着特
性、実写特性共に良好であった。
[Evaluation of Toner] 4 parts of the externally added toner and Cu—Zn— surface-coated with a resin containing methyl silicone
96 parts of a ferrite carrier (average particle size = 100 μm) was stirred and mixed with a V-type mixer to prepare a developer. Using this developer as a starting developer and externally added toner as a replenishment toner, a 30,000-sheet actual copying test was carried out with a copier equipped with a negatively chargeable organic photoconductor photoreceptor at a copying speed of 60 sheets / min. . Further, the molecular weight distribution of the obtained toner was measured, and a fixing test was carried out at a sheet passing speed of 60 sheets / minute copying speed to confirm the operating temperature range. As a result, this toner does not cause hot offset up to 230 ° C.
The amount of toner scattering after the actual copying of 10,000 sheets was small, and the fixing characteristics and the actual copying characteristics were good.

【0035】<比較例1>図1の製造フローに準じてト
ナーを作製した。 〔原料配合混合工程a〕
Comparative Example 1 A toner was manufactured according to the manufacturing flow of FIG. [Raw material mixing and mixing step a]

【0036】[0036]

【表4】 ・スチレン/n−ブチルアクリレートの共重合樹脂 100部 (Tm=130℃、Tg=60℃) ・着色剤 カーボンブラックMA−100S(三菱化成(株)) 6部 ・帯電制御剤 ボントロンP−51(オリエント化学工業(株)) 2部 ・低分子量ポリプロピレン 2部 (蒸気圧浸透圧法の数平均分子量=7,500) ・トナー微粉〔微粉割合は25%〕 37部 の配合をし、ナウターミキサーで混合した。[Table 4]   ・ Styrene / n-butyl acrylate copolymer resin 100 parts     (Tm = 130 ° C, Tg = 60 ° C)   ・ Colorant Carbon black MA-100S (Mitsubishi Kasei Co., Ltd.) 6 parts   ・ Charge control agent Bontron P-51 (Orient Chemical Industry Co., Ltd.) 2 parts   ・ Low molecular weight polypropylene 2 parts     (Number average molecular weight of vapor pressure osmometry = 7,500)   ・ Toner fine powder [fine powder ratio is 25%] 37 parts Was mixed and mixed with a Nauta mixer.

【0037】〔その他の工程〕混練工程aから篩別工程
aまでは実施例1と同様の操作を行った。 〔トナーの評価〕実施例1と同様にトナーを評価した結
果、比較例1で作製したトナーは定着特性のホットオフ
セット発生温度が210℃と低く、30,000枚実写
テストでのトナー飛散量は実施例1に比べ約3倍多く、
問題あった。
[Other Steps] From the kneading step a to the sieving step a, the same operations as in Example 1 were performed. [Evaluation of Toner] As a result of evaluating the toner in the same manner as in Example 1, the toner produced in Comparative Example 1 had a hot offset generation temperature of 210 ° C., which is a fixing characteristic, and had a toner scattering amount in a 30,000-sheet actual copying test. About 3 times more than in Example 1,
There was a problem.

【図面の簡単な説明】[Brief description of drawings]

【図1】通常トナー製造フローの一例。FIG. 1 is an example of a normal toner manufacturing flow.

【図2】本発明のトナー製造フローの第1の例。FIG. 2 is a first example of a toner manufacturing flow of the present invention.

【図3】本発明のトナー製造フローの第2の例。FIG. 3 is a second example of the toner manufacturing flow of the invention.

【図4】本発明のトナー製造フローの第3の例。FIG. 4 is a third example of the toner manufacturing flow of the invention.

【図5】2軸タイプ連続式押出機の概略図。FIG. 5 is a schematic view of a twin-screw type continuous extruder.

【図6】図5のA−A’の断面図。6 is a cross-sectional view taken along the line A-A 'in FIG.

【図7】ニーディング部スクリュ(31)と送り部スク
リュ(30)の一例
FIG. 7 shows an example of a kneading section screw (31) and a feeding section screw (30)

【図8】送り部スクリュのパドルの一例を示す概略図。FIG. 8 is a schematic view showing an example of a paddle of a feeding section screw.

【図9】ニーディング部スクリュのパドルの一例を示す
概略図。
FIG. 9 is a schematic view showing an example of a paddle of a kneading portion screw.

【図10】ニーディング部スクリュのパドルの一例を示
す概略図。
FIG. 10 is a schematic view showing an example of a paddle of a kneading section screw.

【図11】ニーディング部スクリュのパドルの一例を示
す概略図。
FIG. 11 is a schematic view showing an example of a paddle of a kneading section screw.

【図12】1軸タイプ連続式押出機の概略図。FIG. 12 is a schematic view of a single-screw type continuous extruder.

【符号の説明】[Explanation of symbols]

1 原料供給口 2 ベント口1 3 ベント口2 4 ベント口3 5 バレル 6 バレルC1 7 バレルC2 8 バレルC3 9 バレルC4 10 バレルC5 11 バレルC6 12 バレルC7 13 バレルC8 14 バレルC9 15 ダイ 16 出口 20 原料ホッパー 21 スクリュフィーダー 24 真空ポンプ 30 送り部スクリュ 31 ニーディング部スクリュ 40 駆動部 1 Raw material supply port 2 Vent port 1 3 Vent port 2 4 vent 3 5 barrels 6 barrel C1 7 barrel C2 8 barrel C3 9 barrel C4 10 barrel C5 11 barrel C6 12 barrel C7 13 barrel C8 14 barrel C9 15 dies 16 exit 20 Raw material hopper 21 screw feeder 24 vacuum pump 30 Feeding unit screw 31 Kneading part screw 40 Drive

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G03G 9/08 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G03G 9/08

Claims (6)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 混練工程aを有するトナー製造工程に
ナー微粉をリサイクルする静電荷像現像用トナーの製造
方法において、トナー微粉は送り部スクリュのみから成
るスクリュを有する連続式押出機で混練する混練工程b
を経るとともに、該混練工程bを経た混練物として前記
混練工程a以降の工程にリサイクルされることを特徴と
する静電荷像現像用トナーの製造方法。
1. A toner manufacturing process including a kneading process a .
In the method of manufacturing the toner for developing an electrostatic image in which the fine powder of toner is recycled, the fine powder of toner is composed of only the screw at the feeding section.
Kneading step b of kneading with a continuous extruder having a screw
And a kneaded product which has been subjected to the kneading step b.
A method for producing a toner for developing an electrostatic charge image, which is recycled in a step after the kneading step a .
【請求項2】 連続式押出機のバレル内径Dと原料供給
口から出口までの長さLがL/D≦35の関係にあるこ
とを特徴とする請求項1に記載の静電荷像現像用トナー
の製造方法。
2. The electrostatic charge image developing according to claim 1, wherein the barrel inner diameter D of the continuous extruder and the length L from the raw material supply port to the outlet have a relationship of L / D ≦ 35. Toner manufacturing method.
【請求項3】 連続式押出機のスクリュ軸数が1軸であ
ることを特徴とする請求項1または2に記載の静電荷像
現像用トナーの製造方法。
3. The method for producing an electrostatic image developing toner according to claim 1, wherein the number of screw shafts of the continuous extruder is one.
【請求項4】 連続式押出機のスクリュ条数が2条であ
ることを特徴とする請求項1乃至3の何れかに記載の静
電荷像現像用トナーの製造方法。
4. The method for producing an electrostatic image developing toner according to claim 1, wherein the continuous extruder has two screw threads.
【請求項5】 トナー微粉を送り部スクリュのみから成
る連続式押出機で混練、冷却、粉砕した後にリサイクル
することを特徴とする請求項1乃至4の何れかに記載の
静電荷像現像用トナーの製造方法。
5. The toner fine powder is formed only by the screw of the feeding section.
That kneaded in a continuous extruder, cooling, manufacturing method of the electrostatic image developing toner according to any one of claims 1 to 4, characterized in that the recycling after grinding.
【請求項6】 トナー微粉を送り部スクリュのみから成
る連続式押出機で混練、冷却、粉砕、分級した後にリ
イクルすることを特徴とする請求項1乃至5の何れかに
記載の静電荷像現像用トナーの製造方法。
6. The toner fine powder is composed of only the screw of the feeding section.
That kneaded in a continuous extruder, cooling, pulverizing, classifying the re Sa <br/> claims 1 to either the <br/> toner according to 5, characterized in that cycle after Manufacturing method.
JP20699894A 1994-08-31 1994-08-31 Method for producing toner for developing electrostatic images Expired - Fee Related JP3456025B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20699894A JP3456025B2 (en) 1994-08-31 1994-08-31 Method for producing toner for developing electrostatic images

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20699894A JP3456025B2 (en) 1994-08-31 1994-08-31 Method for producing toner for developing electrostatic images

Publications (2)

Publication Number Publication Date
JPH0869126A JPH0869126A (en) 1996-03-12
JP3456025B2 true JP3456025B2 (en) 2003-10-14

Family

ID=16532504

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20699894A Expired - Fee Related JP3456025B2 (en) 1994-08-31 1994-08-31 Method for producing toner for developing electrostatic images

Country Status (1)

Country Link
JP (1) JP3456025B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8114565B2 (en) 2008-02-29 2012-02-14 Ricoh Company, Ltd. Toner production method and toner granulating apparatus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69943388D1 (en) * 1998-09-01 2011-06-09 Kao Corp PROCESS FOR PRODUCING TONERS
JP3720243B2 (en) 2000-06-05 2005-11-24 シャープ株式会社 Resin molded product and manufacturing method thereof
EP1357437B1 (en) 2002-04-24 2010-03-10 Canon Kabushiki Kaisha Process for producing toner particles
US7494758B2 (en) 2005-01-24 2009-02-24 Canon Kabushiki Kaisha Process for producing toner particles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8114565B2 (en) 2008-02-29 2012-02-14 Ricoh Company, Ltd. Toner production method and toner granulating apparatus

Also Published As

Publication number Publication date
JPH0869126A (en) 1996-03-12

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