JP2007271820A - Method for manufacturing electrophotographic toner - Google Patents

Method for manufacturing electrophotographic toner Download PDF

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Publication number
JP2007271820A
JP2007271820A JP2006095979A JP2006095979A JP2007271820A JP 2007271820 A JP2007271820 A JP 2007271820A JP 2006095979 A JP2006095979 A JP 2006095979A JP 2006095979 A JP2006095979 A JP 2006095979A JP 2007271820 A JP2007271820 A JP 2007271820A
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toner
water
kneading
raw material
electrophotographic toner
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Tadahiro Tsubaki
忠洋 椿
Hideki Ikeda
英樹 池田
Masahiro Maeda
正博 前田
Goshi Mitsui
郷史 三井
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Casio Computer Co Ltd
Casio Electronics Co Ltd
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Casio Computer Co Ltd
Casio Electronics Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing electrophotographic toner which is good in fogging property, image quality and durability by improving the dispersibility of toner internal additives without requiring a pigment masterbatch. <P>SOLUTION: The method for manufacturing the electrophotographic toner comprises: a step of mixing materials including a binder resin, a colorant, a release agent and a charge control agent; a step of melt-kneading the material mixture with an open kneading machine; a step of pulverizing a kneaded product after solidification by cooling; and a step of classifying pulverized powder, wherein at the mixing step, water in an amount of 10-50 mass% is added to the materials. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、電子写真用トナーの製造方法に係り、特に、カブリ特性、画質、及び耐久性の良好な電子写真用トナーの製造方法に関する。   The present invention relates to a method for producing an electrophotographic toner, and more particularly, to a method for producing an electrophotographic toner having good fog characteristics, image quality, and durability.

電子写真方式による画像形成は、一般に、帯電させたトナーにより静電荷像を現像して可視化し、現像により得られたトナー像を用紙に転写し、定着することにより行われる。このような画像形成に用いられるトナーの製造方法としては、粉砕法、重合法等があるが、一般には粉砕法が主流を占めている。   In general, image formation by electrophotography is performed by developing and visualizing an electrostatic image with charged toner, and transferring and fixing the toner image obtained by development onto a sheet. As a method for producing such a toner used for image formation, there are a pulverization method, a polymerization method, and the like. In general, the pulverization method dominates.

粉砕法の一般的な製造方法は、結着樹脂、着色剤、離型剤、及び帯電制御剤等の原料を乾式で混合した後、2軸押出機などで溶融混練し、冷却固化した後に粗粉砕を行い、混練粗砕物を得る。その後、ジェットミルなどで微粉砕を行い、適切な粒度分布になるように分級機で粒度調整を行う。更にシリカなどと一緒に混合機で混合することで表面処理を行い、トナーを得るものである。   A general production method of the pulverization method is to mix raw materials such as a binder resin, a colorant, a release agent, and a charge control agent in a dry manner, then melt and knead with a twin-screw extruder or the like, and after cooling and solidifying, Crushing is performed to obtain a kneaded crushed material. Thereafter, fine pulverization is performed with a jet mill or the like, and the particle size is adjusted with a classifier so as to obtain an appropriate particle size distribution. Further, the toner is obtained by performing surface treatment by mixing with silica etc. in a mixer.

近年の電子写真用トナーにおける要求性能は益々高度になっている。小粒径化、オイルレス化、低温定着化、高転写効率、高画質化がトナーに対する主な要求である。これらに共通するトナーの要素技術としては、顔料、CCA、WAX等のトナー内添剤を微細に均一に結着樹脂中に分散させることが必要である。   The required performance of electrophotographic toners in recent years has become increasingly sophisticated. The main requirements for toners are to reduce the particle size, reduce oil, fix at low temperature, increase transfer efficiency, and improve image quality. As a common toner elemental technology, it is necessary to finely and uniformly disperse an internal toner additive such as pigment, CCA and WAX in the binder resin.

トナー内添剤の分散性向上技術の一例として、混練条件の最適化および各添加材料の表面処理等がある。また、顔料の分散性向上のための方法として、顔料を樹脂で予備混練(マスターバッチ化)することで分散レベルを向上させることが、カラートナー製造方法において定常的に使用されている。   An example of a technique for improving the dispersibility of the toner internal additive includes optimization of kneading conditions and surface treatment of each additive material. Further, as a method for improving the dispersibility of the pigment, improving the dispersion level by pre-kneading the pigment with a resin (master batch) is regularly used in the color toner manufacturing method.

そのようなマスターバッチ化方法として、水を分散助剤として使用する水添加混練方法が提案されており(例えば、特許文献1〜3参照)、更に顔料の分散性を向上させることが期待できる。   As such a masterbatch method, a water addition kneading method using water as a dispersion aid has been proposed (see, for example, Patent Documents 1 to 3), and it can be expected to further improve the dispersibility of the pigment.

しかしながら、この手法は、トナーの顔料の分散を促進するが、CCAやWAX等の他の添加剤の分散性を向上させることはできない。
特開2004−191787号公報 特開平9−101632号公報 特開平4−230770号公報
However, this technique promotes the dispersion of the toner pigment, but cannot improve the dispersibility of other additives such as CCA and WAX.
JP 2004-191787 A JP-A-9-101632 JP-A-4-230770

本発明は、以上のような事情の下になされ、顔料マスターバッチを必要とせずに、トナー内添剤の分散性を向上させ、それによってカブリ特性、画質、及び耐久性の良好な電子写真用トナーを製造する方法を提供することを目的とする。   The present invention has been made under the circumstances as described above, and improves the dispersibility of the toner internal additive without the need for a pigment masterbatch, and thereby has excellent fog characteristics, image quality, and durability. It is an object to provide a method for producing a toner.

上記課題を解決するため、本発明の第1の態様は、結着樹脂、着色剤、離型剤、及び帯電制御剤を含む原料を混合する工程、原料混合物をオープン型混練機により溶融混練する工程、混練物を冷却固化した後、粉砕する工程、及び粉砕物を分級する工程を具備する電子写真用トナーの製造方法において、前記混合工程において、前記原料に10〜50質量%の水を添加することを特徴とする電子写真用トナーの製造方法を提供する。   In order to solve the above problems, a first aspect of the present invention is a step of mixing raw materials including a binder resin, a colorant, a release agent, and a charge control agent, and melt kneading the raw material mixture with an open type kneader. In the method for producing an electrophotographic toner comprising a step, a step of cooling and solidifying the kneaded product, and a step of pulverizing, and a step of classifying the pulverized product. A method for producing an electrophotographic toner is provided.

このような電子写真用トナーの製造方法において、離型剤としてカルナバワックスを用いることができる。   In such a method for producing an electrophotographic toner, carnauba wax can be used as a release agent.

以上の方法により製造された電子写真用トナーは、5〜7μmの粒径を有することが望ましい。   The electrophotographic toner produced by the above method desirably has a particle size of 5 to 7 μm.

本発明の第2の態様は、以上の方法により製造された電子写真用トナーを提供する。   The second aspect of the present invention provides an electrophotographic toner produced by the above method.

本発明によると、原料を混合する際に、水を添加することで、内添剤の分散性を向上させることができ、それによってカブリ特性、画質、及び耐久性の良好な電子写真用トナーを得ることができる。   According to the present invention, it is possible to improve the dispersibility of the internal additive by adding water at the time of mixing the raw materials, whereby an electrophotographic toner having good fog characteristics, image quality, and durability can be obtained. Obtainable.

以下、発明を実施するための最良の形態について説明する。   The best mode for carrying out the invention will be described below.

本発明の一実施形態に係る電子写真用トナーの製造方法は、原料に水を添加して混合し、混合物をオープン型混練機で混練することを特徴とする。   The method for producing an electrophotographic toner according to an embodiment of the present invention is characterized in that water is added to a raw material and mixed, and the mixture is kneaded with an open kneader.

このように、原料に水を添加して混合し、混合物をオープン型混練機で混練することにより、次のような作用が生ずるものと考えられる。   As described above, it is considered that the following action is caused by adding water to the raw material and mixing, and kneading the mixture with an open type kneader.

即ち、顔料、離型剤、及び帯電制御剤の静電凝集や、微量な不純物によるイオン凝集等が水の添加により緩和されることにより、混合が均一に行われる。また、水の添加や水の蒸発による気化熱により、粘度が上昇し、混練時に強い剪断力が加わるために分散性が向上する。更に、オープン型混練機で混練することにより、混練時の発熱が大気に放散され、溶融粘度が低下しないため、高い分散性が得られる。   That is, the electrostatic aggregation of the pigment, the release agent, and the charge control agent, and the ion aggregation due to a small amount of impurities are alleviated by the addition of water, whereby the mixing is performed uniformly. In addition, the viscosity increases due to the heat of vaporization due to the addition of water and the evaporation of water, and the dispersibility is improved because a strong shearing force is applied during kneading. Furthermore, by kneading with an open type kneader, the heat generated during kneading is dissipated into the atmosphere, and the melt viscosity does not decrease, so that high dispersibility is obtained.

以上の作用により、原料への水の添加とオープン型混練機での混練により、カブリ特性、画質、及び耐久性の良好な電子写真用トナーを得ることができる。   With the above operation, an electrophotographic toner having good fog characteristics, image quality, and durability can be obtained by adding water to the raw material and kneading with an open kneader.

本発明の一実施形態に係る電子写真用トナーの製造方法において、原料に添加される水の量は、原料の10〜50質量%でなければならない。水の量が10質量%未満では、水の添加による効果を得ることができず、50質量%を超えると、混練供給性能が低下し、事実上混練が困難となる。   In the method for producing an electrophotographic toner according to an embodiment of the present invention, the amount of water added to the raw material must be 10 to 50% by mass of the raw material. If the amount of water is less than 10% by mass, the effect due to the addition of water cannot be obtained.

本発明の一実施形態に係るトナーの製造方法は、次のようにして行われる。   The toner manufacturing method according to an embodiment of the present invention is performed as follows.

まず、結着樹脂、着色剤、離型剤、及び帯電制御剤等の材料の計量を行い、計量され材料を混合機により混合する。混合機としては、ヘンシェルミキサー、スーパーミキサー、V型ブレンダー、ナウターミキサー等、任意のものを用いることが出来る。
混合の際には、原料の10〜50質量%の水を添加する。水の添加は、例えば、図1に示すようなヘンシェルミキサー1を用いて行うことができる。即ち、ヘンシェルミキサー1の上部蓋の材料添加口にゴム栓3を介して分液ロート2が取り付けられており、この分液ロート2内には所定量の蒸留水が収容されている。ヘンシェルミキサー1内の原料を混合する際に、分液ロート2のコックを開けて、水の添加を行う。混合終了後、原料混合物は、排出口4から排出される。
First, materials such as a binder resin, a colorant, a release agent, and a charge control agent are measured, and the materials are measured and mixed by a mixer. As a mixing machine, arbitrary things, such as a Henschel mixer, a super mixer, a V-type blender, and a Nauta mixer, can be used.
At the time of mixing, 10 to 50% by mass of the raw material is added. The addition of water can be performed using, for example, a Henschel mixer 1 as shown in FIG. That is, a separating funnel 2 is attached to the material addition port of the upper lid of the Henschel mixer 1 via the rubber plug 3, and a predetermined amount of distilled water is accommodated in the separating funnel 2. When mixing the raw materials in the Henschel mixer 1, the cock of the separatory funnel 2 is opened and water is added. After mixing, the raw material mixture is discharged from the discharge port 4.

原料混合物は、次いでオープンロール型混練機に供給され、そこで溶融混練される。オープンロール型混練機としては、連続式2本ロールミル、連続式3本ロールミル、及びバッチ式ロールミル等、任意の型のものを用いることができる。   The raw material mixture is then fed to an open roll kneader where it is melt kneaded. As an open roll type kneader, an arbitrary type such as a continuous two-roll mill, a continuous three-roll mill, and a batch-type roll mill can be used.

図2は、オープンタイプの連続式2本ロールミルを示す正面図である。オープンタイプの連続式2本ロールミルは、原料混合物が供給されるホッパー11と、オープンタイプの平行に配置された二本のロール12,13と、混練物が排出される排出部14とを具備している。ロール12,13の表面には、混練物を輸送するためのらせん状の溝が形成されている。   FIG. 2 is a front view showing an open type continuous two-roll mill. The open-type continuous two-roll mill includes a hopper 11 to which a raw material mixture is supplied, two open-type rolls 12 and 13 arranged in parallel, and a discharge unit 14 from which a kneaded product is discharged. ing. Helical grooves for transporting the kneaded material are formed on the surfaces of the rolls 12 and 13.

ホッパー11からロール12,13の間に供給された原料混合物は、ロール12,13の表面に巻き付いた状態で、ロール12,13の回転により繰り返し圧縮され、混練され、ロール12,13の表面の溝によって排出部14側に移動し、そこから混練物が排出される。   The raw material mixture supplied between the rolls 12 and 13 from the hopper 11 is repeatedly compressed and kneaded by the rotation of the rolls 12 and 13 while being wound around the surfaces of the rolls 12 and 13. It moves to the discharge part 14 side by the groove, and the kneaded material is discharged from there.

オープンロール型混練機から排出された溶融混練物は、通常、トナーの製造に用いられる方法に従って、冷却され、粉砕され、所定の粒度に分級されて、トナー粒子母体が得られる。冷却手段、粉砕手段及び分級手段は、特に限定されず、通常トナーの製造に用いられるものを採用することが出来る。例えば、冷却には、圧延や空気流の吹き付けによる冷却手段を用いることができ、粉砕には、衝突板式粉砕機等の気流粉砕機を用いることができ、分級には、様々な気流分級機を用いることができる。   The melt-kneaded material discharged from the open roll type kneader is usually cooled, pulverized, and classified to a predetermined particle size according to the method used for toner production to obtain a toner particle matrix. The cooling means, the pulverizing means, and the classification means are not particularly limited, and those usually used for toner production can be employed. For example, a cooling means by rolling or blowing an air flow can be used for cooling, and an airflow pulverizer such as a collision plate pulverizer can be used for pulverization, and various airflow classifiers can be used for classification. Can be used.

このようにして得たトナー粒子母体に、シリカ等の外添剤を加え、混合・攪拌することにより、電子写真用トナーが得られる。   An electrophotographic toner can be obtained by adding an external additive such as silica to the toner particle matrix thus obtained, followed by mixing and stirring.

なお、このようにして製造された電子写真用トナーは、5〜7μmの粒径を有することが望ましい。   The electrophotographic toner thus produced preferably has a particle size of 5 to 7 μm.

以上のように、本発明の第1の実施形態により得た電子写真用トナーは、水が添加された原料混合物を、オープンロール型混練機により溶融混練して製造されたものであるため、高度な分散によって、優れたカブリ特性、画質、及び耐久性を有している。   As described above, the electrophotographic toner obtained according to the first embodiment of the present invention is manufactured by melt-kneading the raw material mixture to which water has been added with an open roll kneader. With excellent dispersion, it has excellent fog characteristics, image quality, and durability.

以下、本発明の実施例及び比較例を示し、本発明について更に具体的に説明する。   EXAMPLES Hereinafter, the Example and comparative example of this invention are shown and this invention is demonstrated more concretely.

最初に、以下の実施例及び比較例における原料混合条件、水の添加条件、外添剤混合条件、混練条件、軟化点、ガラス転移点及び粒径の測定方法について説明する。   First, raw material mixing conditions, water addition conditions, external additive mixing conditions, kneading conditions, softening points, glass transition points, and particle diameter measuring methods in the following Examples and Comparative Examples will be described.

1.原料混合条件
原料の混合は、図1に示すようなヘンシェルミキサー1を用いて行い、投入量はヘンシェルミキサー1の容積に対し、70〜80%の範囲になるように調整する。撹拌羽としては、標準の羽を装着し、周速20m/secで回転させる。
1. Raw material mixing conditions The raw materials are mixed using a Henschel mixer 1 as shown in FIG. 1, and the input amount is adjusted to be in the range of 70 to 80% with respect to the volume of the Henschel mixer 1. As a stirring blade, a standard blade is attached and rotated at a peripheral speed of 20 m / sec.

2.水の添加条件
図1に示すヘンシェルミキサー1の上部蓋の材料添加口にゴム栓3を介して取り付けられた分液ロート2内に予め蒸留水を計量しておく。ヘンシェルミキサー1内に収容された原料の撹拌開始10秒後に、分液ロート2のコックを開けて、水の添加をスタートさせ、30秒間の間に必要量の添加を終了させる。
2. Water Addition Conditions Distilled water is weighed in advance into a separating funnel 2 attached via a rubber stopper 3 to the material addition port of the upper lid of the Henschel mixer 1 shown in FIG. 10 seconds after the start of stirring of the raw material stored in the Henschel mixer 1, the cock of the separatory funnel 2 is opened to start the addition of water, and the addition of the necessary amount is completed within 30 seconds.

3.外添剤混合条件
外添剤の混合は、ヘンシェルミキサーを用いて行う。投入量はヘンシェルミキサーの容積に対し、70〜80%の範囲になるように調整する。撹拌羽は強撹拌羽を装着し、周速40m/secで回転させる。
3. External additive mixing conditions The external additive is mixed using a Henschel mixer. The input amount is adjusted to be in the range of 70 to 80% with respect to the volume of the Henschel mixer. The stirring blade is equipped with a strong stirring blade and is rotated at a peripheral speed of 40 m / sec.

4.混練条件
(1) オープンタイプの連続式2本ロールミル(NDX(ニーデックス)160、三井鉱山(株)社製)による混練
ロール隙間:0.1mm
Fロール
供給温度:120℃、排出温度:120℃、回転数:75rpm
Bロール
供給温度:30℃、排出温度:30℃、回転数:50rpm
(2) 2軸押出混練機(PCM−43、(株)池貝社製)による混練
スクリュウー回転数:250rpm
バレルシリンダ温度
C1:50℃
C2〜C8:120℃、
アダプタ:120℃、
ダイノズル:120℃。
4). Kneading conditions (1) Kneading roll gap by open type continuous two-roll mill (NDX 160, manufactured by Mitsui Mining Co., Ltd.): 0.1 mm
F roll Supply temperature: 120 ° C, discharge temperature: 120 ° C, rotation speed: 75rpm
B roll Supply temperature: 30 ° C, discharge temperature: 30 ° C, rotation speed: 50rpm
(2) Kneading with a twin-screw extrusion kneader (PCM-43, manufactured by Ikegai Co., Ltd.) Screw rotation speed: 250 rpm
Barrel cylinder temperature C1: 50 ° C
C2 to C8: 120 ° C.
Adapter: 120 ° C
Die nozzle: 120 ° C.

5.軟化点の測定
装置:フローテスター(CFT−500D:島津製作所製)
試料:1g
昇温速度:6℃/分
荷重:20kg
ノズル:直径1mm、長さ1mm
1/2法:試料の半分が流出した温度を軟化点とする。
5). Measurement of softening point Apparatus: Flow tester (CFT-500D: manufactured by Shimadzu Corporation)
Sample: 1g
Temperature increase rate: 6 ° C / min Load: 20kg
Nozzle: 1mm diameter, 1mm length
1/2 method: The temperature at which half of the sample flows out is taken as the softening point.

6.ガラス転移点(Tg)の測定
装置:示差走査熱量計(DSC−60:島津製作所社製)
試料:8mg
昇温条件:10℃/分で160℃まで昇温し、降温速度10℃/分で35℃まで冷却した後、再度10℃/分で160℃まで昇温する。
6). Measurement of glass transition point (Tg) Device: differential scanning calorimeter (DSC-60: manufactured by Shimadzu Corporation)
Sample: 8mg
Temperature raising conditions: The temperature is raised to 160 ° C. at 10 ° C./min, cooled to 35 ° C. at a temperature lowering rate of 10 ° C./min, and then raised again to 160 ° C. at 10 ° C./min.

2回目の昇温時において、転移により得られる曲線部分の2つの接線の交点をガラス転移点とする。   At the time of the second temperature increase, the intersection of two tangents of the curve portion obtained by the transition is defined as the glass transition point.

7.粒径の測定
装置:マルチサイザーII(コールター社製)
試料:ビーカーに試料少量と精製水、界面活性剤を入れ、超音波洗浄器にて分散する。
7). Particle size measurement device: Multisizer II (Coulter)
Sample: Place a small amount of sample, purified water, and surfactant in a beaker and disperse with an ultrasonic cleaner.

測定:アパーチャーは100μmで行い、カウントは50,000個で行い、体積平均粒径を得る。   Measurement: The aperture is 100 μm, the count is 50,000, and the volume average particle diameter is obtained.

実施例1
結着樹脂として、ポリエステル樹脂(軟化点120℃、Tg67℃)90質量部、着色剤(生顔料)として、C.I.ピグメントレッド122を5質量部、離型剤として、カルナバワックス1号粉末(加藤洋行)を4質量部、帯電制御剤として、E−84(オリエント化学株式会社)を1質量部、水を10質量部、をヘンシェルミキサー(標準羽装着:三井鉱山社製)に投入し、3分間撹拌混合した。
Example 1
As a binder resin, 90 parts by mass of a polyester resin (softening point 120 ° C., Tg 67 ° C.) and as a colorant (raw pigment), C.I. I. 5 parts by weight of Pigment Red 122, 4 parts by weight of Carnauba Wax No. 1 powder (Yoyuki Kato) as a release agent, 1 part by weight of E-84 (Orient Chemical Co., Ltd.) and 10 parts by weight of water as a charge control agent Was put into a Henschel mixer (standard feather mounted: manufactured by Mitsui Mining Co., Ltd.) and mixed with stirring for 3 minutes.

得られた混合粉体をオープンロール型2軸押出機(NDX160)で溶融混練し、延伸、冷却し、ロートプレックス(2mmスクリーン:ホソカワミクロン社製)で粗砕した後、衝突式粉砕機・風力分級機にて、トナー平均粒径が6.0μmになるように粉砕分級を行い、微粒子を得た。   The obtained mixed powder is melt-kneaded with an open roll type twin screw extruder (NDX160), stretched, cooled, and coarsely crushed with a Rotoplex (2 mm screen: manufactured by Hosokawa Micron), followed by a collision type pulverizer / air classification. The fine particles were obtained by pulverization and classification so that the average particle diameter of the toner was 6.0 μm.

得られた微粒子100質量部に外添剤として、「RY200」(疎水性シリカ:日本アエロジル社製)を2質量部添加し、ヘンシェルミキサー(撹拌強化羽装着:三井鉱山社製)で3分間撹拌混合し、トナーを得た。   As an external additive, 2 parts by mass of “RY200” (hydrophobic silica: manufactured by Nippon Aerosil Co., Ltd.) is added to 100 parts by mass of the obtained fine particles, and the mixture is stirred for 3 minutes with a Henschel mixer (with stirring reinforcement blades: manufactured by Mitsui Mining Co., Ltd.). The toner was obtained by mixing.

実施例2
原料に添加する水の量を30質量部としたことを除いて、実施例1と同様にしてトナーを得た。
Example 2
A toner was obtained in the same manner as in Example 1 except that the amount of water added to the raw material was 30 parts by mass.

実施例3
原料に添加する水の量を50質量部としたことを除いて、実施例1と同様にしてトナーを得た。
Example 3
A toner was obtained in the same manner as in Example 1 except that the amount of water added to the raw material was 50 parts by mass.

比較例1
原料に水を添加しなかったことを除いて、実施例1と同様にしてトナーを得た。
Comparative Example 1
A toner was obtained in the same manner as in Example 1 except that water was not added to the raw material.

比較例2
原料に添加する水の量を60質量部としたことを除いて、実施例1と同様にしてトナーを得た。
Comparative Example 2
A toner was obtained in the same manner as in Example 1 except that the amount of water added to the raw material was 60 parts by mass.

比較例3
混練機としてPCM43((株)池貝社製)を用いたことを除いて、実施例1と同様にしてトナーを得た。
Comparative Example 3
A toner was obtained in the same manner as in Example 1 except that PCM43 (manufactured by Ikegai Co., Ltd.) was used as the kneader.

比較例4
混練機としてPCM43((株)池貝社製)を用いたことを除いて、実施例2と同様にしてトナーを得た。
Comparative Example 4
A toner was obtained in the same manner as in Example 2 except that PCM43 (manufactured by Ikegai Co., Ltd.) was used as the kneader.

比較例5
混練機としてPCM43((株)池貝社製)を用いたことを除いて、実施例3と同様にしてトナーを得た。
Comparative Example 5
A toner was obtained in the same manner as in Example 3 except that PCM43 (manufactured by Ikegai Co., Ltd.) was used as the kneader.

以上の実施例及び比較例で得たトナー試料について、下記の試験を行い、特性を評価した。   The toner samples obtained in the above Examples and Comparative Examples were subjected to the following tests to evaluate the characteristics.

試験1−かぶり
非磁性一成分現像装置「カシオページプレストN−5」(カシオ計算機社製:カラープリンタ毎分29枚(A4横)機、プロセススピード129mm/sec)にトナーを実装し、通常環境(25℃、50%RH)において、普通紙(XEROX−P紙A4サイズ)を用いて5%印字画像を10,000枚連続印字した後、白紙印字を行い、印字している途中でフロント扉を開けることにより、印字を強制終了させ、その時のOPCドラム上のカブリトナーをメンディングテープに写しとり、目視にて比較した。
Test 1-fogging Non-magnetic one-component developing device “Casio Page Presto N-5” (manufactured by Casio Computer Co., Ltd .: color printer 29 sheets per minute (A4 horizontal) machine, process speed 129 mm / sec) mounted with normal toner (25 ° C, 50% RH) Using normal paper (XEROX-P paper A4 size), 5% print images were continuously printed on 10,000 sheets, then blank paper was printed. Then, printing was forcibly terminated, and the fog toner on the OPC drum at that time was copied onto a mending tape and compared visually.

比較例1と比較し、同等の場合は○、比較例1よりカブリが少ない場合は◎、比較例1よりもカブリ量が多い場合は×とした。   In comparison with Comparative Example 1, the case of Equivalent was evaluated as ◯, the case of less fog than Comparative Example 1 as ◎, and the case where the amount of fog was larger than Comparative Example 1 as x.

試験2−高画質
試験1で使用した装置を用い、通常環境(25℃、50%RH)において、普通紙(XEROX−P紙A4サイズ)を用いて5%印字画像を10,000枚連続印字したあと、ハーフトーン画像及びベタ画像を印字し、画像の均一性を評価した。比較例1と比較し、同等の場合は○、比較例1より良好な場合は◎、比較例1よりも均一でない場合は×とした。
Test 2-High image quality Using the equipment used in Test 1, in a normal environment (25 ° C, 50% RH), continuous printing of 5% print images using plain paper (XEROX-P paper A4 size) After that, a halftone image and a solid image were printed, and the uniformity of the image was evaluated. In comparison with Comparative Example 1, it was evaluated as ◯ when equal, ◎ when better than Comparative Example 1, and × when it was not more uniform than Comparative Example 1.

試験3−耐久性
試験1と同様の装置を用い、通常環境(25℃、50%RH)において、5%印字画像を14,000枚連続印字した。途中、2,000枚おきにベタ画像、ハーフトーン画像を印字し、ブレード融着による白スジの発生枚数を評価した。
Test 3-Durability Using the same apparatus as in Test 1, 14,000 sheets of 5% print images were continuously printed in a normal environment (25 ° C, 50% RH). In the middle, solid images and halftone images were printed every 2,000 sheets, and the number of white stripes generated by blade fusion was evaluated.

◎:14,000枚まで発生しない
○:12,000枚以降に発生
×:12,000枚未満で発生
試験4−混練供給性能
混練工程にて、原料供給量を、25kg/hから45kg/hまで5kg/h刻みに徐々に上げていき、フィードネック現象の発生の有無を観察した。
◎: Not generated up to 14,000 sheets ○: Generated after 12,000 sheets ×: Generated with less than 12,000 sheets Test 4-kneading supply performance In the kneading process, the raw material supply amount was changed from 25 kg / h to 45 kg / h. The feed rate was gradually increased to 5 kg / h until the feed neck phenomenon was observed.

◎:40kg/h以上の供給量(良好)
○:30kg/h以上の供給量(許容できる)
×:25kg/h以下の供給量(生産性が不十分)
試験5−残水分率
トナー2gを130℃恒温槽にて1時間乾燥し、前後の重量変化(乾燥減量)を残水分率として評価した。
A: Supply amount of 40 kg / h or more (good)
○: Supply amount of 30 kg / h or more (acceptable)
X: Supply amount of 25 kg / h or less (productivity is insufficient)
Test 5-Residual Moisture Ratio 2 g of toner was dried in a constant temperature bath at 130 ° C. for 1 hour, and the weight change (loss on drying) before and after was evaluated as the residual moisture ratio.

○:変化率0.5%以下(品質上問題なし)
×:変化率0.5%以上(品質上問題あり)
試験6−OHP透明性
試験1で使用した装置を用い、通常環境(25℃、50%RH)において、OHP用紙(3M社製:CG3710)を用いてベタ画像を印字し、下記の基準で評価した。
○: Change rate 0.5% or less (no problem in quality)
×: Change rate of 0.5% or more (there is a quality problem)
Test 6-OHP Transparency Using the apparatus used in Test 1, in a normal environment (25 ° C., 50% RH), a solid image was printed using OHP paper (manufactured by 3M: CG3710) and evaluated according to the following criteria. did.

◎:最大透過度が80%以上で実用上非常に良好
○:最大透過度が60〜80%実用上問題ない
×:最大透過度が60%未満で、実用上問題がある
以上の試験結果を下記表3に示す。

Figure 2007271820
A: The maximum transmittance is 80% or more and practically very good. ○: The maximum transmittance is 60 to 80%. There is no practical problem. X: The maximum transmittance is less than 60% and there is a practical problem. It is shown in Table 3 below.
Figure 2007271820

上記表3から、以下のことが明らかである。即ち、混合工程において、原料に10〜50質量%の水を添加し、混練をオープン型混練機で行って得た実施例1〜3のトナーは、カブリ、画質、耐久性、混練供給性能、残水分率、OHP透明性のいずれにおいても優れた性能を示している。   From Table 3 above, the following is clear. That is, in the mixing step, the toners of Examples 1 to 3 obtained by adding 10 to 50% by mass of water to the raw material and performing kneading with an open type kneader are fogging, image quality, durability, kneading supply performance, It shows excellent performance in both the residual moisture content and OHP transparency.

これに対し、原料に水を添加していない比較例1のトナーは、カブリ、画質、耐久性、OHP透明性において劣っており、水の添加量が多すぎる比較例2のトナーは、カブリ、画質、耐久性、混練供給性能、残水分率、OHP透明性のすべての特性において劣っている。また、水が多すぎると、混練供給性能が極端に低下するため、トナーの製造が困難となる。   On the other hand, the toner of Comparative Example 1 in which water was not added to the raw material was inferior in fog, image quality, durability, and OHP transparency. It is inferior in all the characteristics of image quality, durability, kneading supply performance, residual moisture content, and OHP transparency. On the other hand, when the amount of water is too much, the kneading and feeding performance is extremely lowered, which makes it difficult to manufacture the toner.

また、混練をオープン型でない混練機で行って得た比較例3〜5のトナーは、原料に水を添加したにもかかわらず、劣った特性を示している。   Further, the toners of Comparative Examples 3 to 5 obtained by kneading with a non-open type kneader showed inferior characteristics despite the addition of water to the raw material.

本発明の一実施形態に用いる、水を添加する分液ロートを備えたヘンシェルミキサーを示す図。The figure which shows the Henschel mixer provided with the separating funnel which adds water used for one Embodiment of this invention. 本発明の一実施形態に用いるオープンタイプの連続式2本ロールミルを示す正面図。The front view which shows the open type continuous type 2 roll mill used for one Embodiment of this invention.

符号の説明Explanation of symbols

1…ヘンシェルミキサー、2…分液ロート、3…ゴム栓、4…排出口、11・・・ホッパー、12,13・・・ロール、14・・・排出部。   DESCRIPTION OF SYMBOLS 1 ... Henschel mixer, 2 ... Separation funnel, 3 ... Rubber stopper, 4 ... Discharge port, 11 ... Hopper, 12, 13 ... Roll, 14 ... Discharge part.

Claims (4)

結着樹脂、着色剤、離型剤、及び帯電制御剤を含む原料を混合する工程、
原料混合物をオープン型混練機により溶融混練する工程、
混練物を冷却固化した後、粉砕する工程、及び
粉砕物を分級する工程
を具備する電子写真用トナーの製造方法において、
前記混合工程において、前記原料に10〜50質量%の水を添加することを特徴とする電子写真用トナーの製造方法。
Mixing raw materials including a binder resin, a colorant, a release agent, and a charge control agent;
Melting and kneading the raw material mixture with an open kneader,
In the method for producing an electrophotographic toner comprising the steps of cooling and solidifying the kneaded product and then pulverizing, and classifying the pulverized product,
In the mixing step, 10 to 50% by mass of water is added to the raw material.
前記離型剤は、カルナバワックスであることを特徴とする請求項1に記載の電子写真用トナーの製造方法。   The method for producing a toner for electrophotography according to claim 1, wherein the release agent is carnauba wax. 5〜7μmの粒径を有することを特徴とする請求項1又は2に記載のトナーの製造方法。   The toner production method according to claim 1, wherein the toner has a particle size of 5 to 7 μm. 請求項1〜3のいずれかに記載のトナーの製造方法により製造されたことを特徴とする電子写真用トナー。   An electrophotographic toner produced by the toner production method according to claim 1.
JP2006095979A 2006-03-30 2006-03-30 Method for manufacturing electrophotographic toner Pending JP2007271820A (en)

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JP2008281924A (en) * 2007-05-14 2008-11-20 Tomoegawa Paper Co Ltd Method for manufacturing toner for electrostatic charge image development
JP2010026338A (en) * 2008-07-22 2010-02-04 Tomoegawa Paper Co Ltd Toner for electrostatic charge image development and method for manufacturing the same
JP2010122370A (en) * 2008-11-18 2010-06-03 Fuji Xerox Co Ltd Electrostatic charge image developing toner and method of producing the same, electrostatic charge image developer, toner cartridge, process cartridge and image forming device
WO2014069257A1 (en) * 2012-11-01 2014-05-08 花王株式会社 Method for producing toner for developing electrostatic images

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JPH04269765A (en) * 1991-02-25 1992-09-25 Fuji Xerox Co Ltd Production of electrophotography developer
JP2004177714A (en) * 2002-11-27 2004-06-24 Kao Corp Method for manufacturing toner

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JPH04269765A (en) * 1991-02-25 1992-09-25 Fuji Xerox Co Ltd Production of electrophotography developer
JP2004177714A (en) * 2002-11-27 2004-06-24 Kao Corp Method for manufacturing toner

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008281924A (en) * 2007-05-14 2008-11-20 Tomoegawa Paper Co Ltd Method for manufacturing toner for electrostatic charge image development
JP2010026338A (en) * 2008-07-22 2010-02-04 Tomoegawa Paper Co Ltd Toner for electrostatic charge image development and method for manufacturing the same
JP2010122370A (en) * 2008-11-18 2010-06-03 Fuji Xerox Co Ltd Electrostatic charge image developing toner and method of producing the same, electrostatic charge image developer, toner cartridge, process cartridge and image forming device
JP4661944B2 (en) * 2008-11-18 2011-03-30 富士ゼロックス株式会社 Method for producing toner for developing electrostatic image
US8329375B2 (en) 2008-11-18 2012-12-11 Fuji Xerox Co., Ltd. Electrostatic charge image developing toner and method of producing the same, electrostatic charge image developer, toner cartridge, process cartridge, and image forming device
US8563208B2 (en) 2008-11-18 2013-10-22 Fuji Xerox Co., Ltd. Electrostatic charge image developing toner and method of producing the same, electrostatic charge image developer, toner cartridge, process cartridge, and image forming device
WO2014069257A1 (en) * 2012-11-01 2014-05-08 花王株式会社 Method for producing toner for developing electrostatic images
US9715184B2 (en) 2012-11-01 2017-07-25 Kao Corporation Method for producing toner for developing electrostatic images

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