JP2007334201A - Method for manufacturing electrophotographic toner and electrophotographic toner - Google Patents

Method for manufacturing electrophotographic toner and electrophotographic toner Download PDF

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Publication number
JP2007334201A
JP2007334201A JP2006168583A JP2006168583A JP2007334201A JP 2007334201 A JP2007334201 A JP 2007334201A JP 2006168583 A JP2006168583 A JP 2006168583A JP 2006168583 A JP2006168583 A JP 2006168583A JP 2007334201 A JP2007334201 A JP 2007334201A
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electrophotographic toner
toner
solid
producing
phase
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Takahaya Iketani
拓速 池谷
Takashi Kudo
琢史 工藤
Atsuo Miyamoto
篤生 宮本
Yoshihito Suwa
義仁 諏訪
Nobuyuki Aoki
信之 青木
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Tomoegawa Co Ltd
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Tomoegawa Paper Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an electrophotographic toner by which an electrophotographic toner excellent in coloring density and image quality of an image can be manufactured without using a masterbatch, and to provide an electrophotographic toner. <P>SOLUTION: The method for manufacturing an electrophotographic toner includes a kneading step of carrying out kneading of materials in solid phase including at least a binder resin and a colorant with a kneading machine for solid phase to obtain a kneaded product, and a pulverization-classification step of pulverizing and classifying the kneaded product after cooling to obtain toner base particles. The method for manufacturing an electrophotographic toner further includes an external addition step of sticking an external additive to the toner base particles to obtain the objective toner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、電子写真用トナーの製造方法および電子写真用トナーに関するものである。   The present invention relates to a method for producing an electrophotographic toner and an electrophotographic toner.

電子写真用トナー、とりわけカラートナーでは画像の着色濃度が重視される。この着色濃度は着色剤の種類にもよるが、トナー中の着色剤分散状態に大きく影響される。すなわち、着色剤が良好に分散したトナーの画像は着色濃度が良好で均一な色調になるのに対し、着色剤の分散が不良のトナーでの画像は着色濃度が不良となり不均一な色調となってしまう。また、着色剤の分散が不良のトナーではトナー粒子個々の組成が不均一となり、帯電性が不均一になって濃度低下などの画質の問題が発生しやすくなる。   In electrophotographic toners, especially color toners, the color density of an image is important. Although this color density depends on the type of colorant, it is greatly affected by the colorant dispersion state in the toner. In other words, a toner image in which the colorant is well dispersed has a uniform color tone with a good color density, whereas an image with a toner having a poor colorant dispersion has a poor color density and an uneven color tone. End up. In addition, in a toner with poor colorant dispersion, the composition of the individual toner particles becomes non-uniform, and the chargeability becomes non-uniform, which tends to cause image quality problems such as density reduction.

これら着色剤の分散不良を防止するために、予め着色剤を樹脂に分散させたマスターバッチを製造し、その後に主樹脂及び各種添加剤と混合して溶融混練、粉砕分級を行ってトナー化する方法が利用されている。この方法では、マスターバッチ製造時に着色剤表面と樹脂との親和性が増大するために、後の溶融混練工程で着色剤が良好に分散するようになることが確認されている。   In order to prevent poor dispersion of these colorants, a master batch in which the colorants are dispersed in the resin is manufactured in advance, and then mixed with the main resin and various additives, and then melt kneaded and pulverized and classified into toners. The method is being used. In this method, since the affinity between the surface of the colorant and the resin is increased during the production of the masterbatch, it has been confirmed that the colorant is favorably dispersed in the subsequent melt-kneading step.

このようなマスターバッチによるトナー製造はカラートナーの場合ごく一般的に行われており、特に近年利用度が増してきたフルカラー複写機及びフルカラープリンタなどに使用されるフルカラートナーではほぼ例外なくこのマスターバッチが使用されている(例えば、特許文献1参照)。
しかし、マスターバッチの製造には高度な技術や特殊な設備が必要であり、マスターバッチの製造がトナーのコストアップの一因となっていた。
また、ブラックトナーの場合でも、着色剤をよりよく分散させる方法が求められていた。
Toner production using such a masterbatch is generally performed in the case of color toners, and in particular for full-color toners used in full-color copiers and full-color printers, which have been increasingly used in recent years, this masterbatch is almost without exception. Is used (see, for example, Patent Document 1).
However, the production of the masterbatch requires advanced technology and special equipment, and the production of the masterbatch has contributed to the cost increase of the toner.
Even in the case of black toner, a method for better dispersing the colorant has been demanded.

特開平10−268573号公報Japanese Patent Laid-Open No. 10-268573

本発明は、以上のような問題点に鑑みて為されたものであり、その目的とする処は、マスターバッチを用いなくても、画像の着色濃度や画質に優れた電子写真用トナーを製造できる電子写真用トナーの製造方法および電子写真用トナーを提供することにある。   The present invention has been made in view of the above-described problems, and the object of the present invention is to produce an electrophotographic toner excellent in color density and image quality of an image without using a masterbatch. An object of the present invention is to provide an electrophotographic toner manufacturing method and an electrophotographic toner.

本発明は、下記の技術的構成により、上記課題を解決できたものである。   The present invention has solved the above problems by the following technical configuration.

(1)少なくとも結着樹脂および着色剤を含有する原料を、固相混練機を用いて固相混練して混練物を得る固相混練工程と、前記混練物を冷却して粉砕分級してトナー母体粒子を得る粉砕分級工程とを有することを特徴とする電子写真用トナーの製造方法。
(2)さらに、前記トナー母体粒子に外添剤を付着させてトナーを得る外添工程を有することを特徴とする前記(1)記載の電子写真用トナーの製造方法。
(3)前記着色剤は、カラー顔料粉末であることを特徴とする前記(1)記載の電子写真用トナーの製造方法。
(4)前記固相混練機の混練部温度は30〜200℃であることを特徴とする前記(1)記載の電子写真用トナーの製造方法。
(5)前記固相混練機のフィード部、メータリング部、ベント部、ダイス部の温度は、30〜200℃であることを特徴とする前記(1)または(4)記載の電子写真用トナーの製造方法。
(6)前記固相混練機内の原料の温度は50〜200℃であることを特徴とする前記(1)、(4)、(5)のいずれか記載の電子写真用トナーの製造方法。
(7)前記固相混練機の回転数は20〜200rpmであることを特徴とする前記(1)、(4)、(5)、(6)のいずれか記載の電子写真用トナーの製造方法。
(8)前記固相混練機の負荷電流は10〜30Aであることを特徴とする前記(1)、(4)、(5)、(6)、(7)のいずれか記載の電子写真用トナーの製造方法。
(9)前記(1)ないし(8)のいずれか記載の電子写真用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。
(1) A solid phase kneading step in which a raw material containing at least a binder resin and a colorant is solid-phase kneaded using a solid-phase kneader to obtain a kneaded product; And a pulverization and classification step for obtaining base particles.
(2) The method for producing an electrophotographic toner according to the above (1), further comprising an external addition step of attaching an external additive to the toner base particles to obtain a toner.
(3) The method for producing an electrophotographic toner according to (1), wherein the colorant is a color pigment powder.
(4) The method for producing a toner for electrophotography according to (1), wherein the temperature of the kneading part of the solid phase kneader is 30 to 200 ° C.
(5) The electrophotographic toner according to (1) or (4) above, wherein the temperature of the feed portion, metering portion, vent portion, and die portion of the solid-phase kneader is 30 to 200 ° C. Manufacturing method.
(6) The method for producing an electrophotographic toner according to any one of (1), (4), and (5), wherein the temperature of the raw material in the solid-phase kneader is 50 to 200 ° C.
(7) The method for producing an electrophotographic toner according to any one of (1), (4), (5), and (6) above, wherein the rotation speed of the solid-phase kneader is 20 to 200 rpm. .
(8) The load current of the solid-phase kneader is 10 to 30 A, for electrophotography according to any one of (1), (4), (5), (6), and (7) Toner manufacturing method.
(9) An electrophotographic toner produced by the method for producing an electrophotographic toner according to any one of (1) to (8).

本発明によれば、マスターバッチを用いなくても、画像の着色濃度や画質に優れた電子写真用トナーを製造できる電子写真用トナーの製造方法および電子写真用トナーを提供できる。   According to the present invention, it is possible to provide an electrophotographic toner production method and an electrophotographic toner that can produce an electrophotographic toner excellent in color density and image quality of an image without using a masterbatch.

本発明の電子写真用トナーの製造方法は、1)少なくとも結着樹脂および着色剤を含有する原料を、固相混練機を用いて固相混練して混練物を得る固相混練工程と、2)前記混練物を冷却して粉砕分級してトナー母体粒子を得る粉砕分級工程とを有することを特徴とする。   The method for producing an electrophotographic toner of the present invention includes: 1) a solid phase kneading step of obtaining a kneaded product by solid phase kneading a raw material containing at least a binder resin and a colorant using a solid phase kneader; And a pulverizing and classifying step of cooling and classifying the kneaded product to obtain toner base particles.

固相混練工程では、少なくとも結着樹脂および着色剤を含有する原料を、固相混練機(浅田鉄工株式会社製、商品名:ミラクルKCK)を用いて固体状態で強剪断力をかけてることで混練物を得ることができる。
本発明でいう固相混練機とは、例えば、固定円盤キャビティと回転円盤キャビティのスライスを利用した一軸連続式の固相剪断押出機であり、少なくとも結着樹脂とそれに添加する原材料の圧縮、剪断、置換を繰り返して、物理的あるいはメカノケミカル的に混練を行う混練機のことをいう。
着色剤はブラック、カラーいずれでもよい。また、マスターバッチではなくカラー顔料粉末自体(いわゆる生顔料)を用いることができる。
また、固相混練機の条件を下記のように調節することで、さらに着色剤の分散状態を良好にすることができる。
混練部温度は、30〜200℃とすることができ、40〜140℃が好ましく、50〜80℃がもっとも好ましい。
フィード部、メータリング部、ベント部、ダイス部の温度は、同じ温度でも異なる温度でもよく、30〜200℃とすることができ、30〜140℃が好ましく、40〜110℃がもっとも好ましい。
固相混練機内の原料の温度は、50〜200℃が好ましく、100〜130℃がもっとも好ましい。
回転数は、20〜200rpmとすることができ、60〜160rpmが好ましく、60〜120rpmがもっとも好ましい。
負荷電流は10〜30A(アンペア)が好ましい。
In the solid phase kneading step, a raw material containing at least a binder resin and a colorant is subjected to a strong shear force in a solid state using a solid phase kneader (manufactured by Asada Tekko Co., Ltd., trade name: Miracle KCK). A kneaded product can be obtained.
The solid-phase kneading machine referred to in the present invention is, for example, a uniaxial continuous solid-phase shear extruder using slices of a fixed disk cavity and a rotating disk cavity, and compresses and shears at least a binder resin and raw materials added thereto. , Refers to a kneader that repeats substitution and performs kneading physically or mechanochemically.
The colorant may be black or color. Further, color pigment powder itself (so-called raw pigment) can be used instead of the master batch.
Moreover, the dispersion state of the colorant can be further improved by adjusting the conditions of the solid-phase kneader as follows.
The kneading part temperature can be 30 to 200 ° C, preferably 40 to 140 ° C, and most preferably 50 to 80 ° C.
The temperature of a feed part, a metering part, a vent part, and a dice | dies part may be the same temperature or different temperature, can be 30-200 degreeC, 30-140 degreeC is preferable and 40-110 degreeC is the most preferable.
The temperature of the raw material in the solid-phase kneader is preferably 50 to 200 ° C, and most preferably 100 to 130 ° C.
The number of rotations can be 20 to 200 rpm, preferably 60 to 160 rpm, and most preferably 60 to 120 rpm.
The load current is preferably 10 to 30 A (ampere).

粉砕分級工程では、混練物を冷却して粉砕分級してトナー母体粒子を得る。
ドラムフレーカーで冷却するのがもっとも好ましいが、水中での冷却または空気中での放冷でもよい。
粉砕方法としては、ハンマーミル、カッターミルあるいはジェットミル等の装置による粉砕方法が挙げられる。
また、分級法としては、通常、乾式遠心分級機のような気流分級機による方法等により目的とする粒子径のトナー母体粒子を得る。
In the pulverization and classification step, the kneaded product is cooled and pulverized and classified to obtain toner base particles.
Although cooling with a drum flaker is most preferable, cooling in water or cooling in air may be used.
Examples of the pulverization method include a pulverization method using an apparatus such as a hammer mill, a cutter mill, or a jet mill.
As a classification method, toner base particles having a target particle size are usually obtained by a method using an airflow classifier such as a dry centrifugal classifier.

本発明の電子写真用トナーの製造方法では、さらに、トナー母体粒子に外添剤を付着させてトナーを得る外添工程を有することが好ましい。
外添工程では、デフレクターを有するタービン型攪拌機、ヘンシェルミキサー、スーパーミキサー等の攪拌機を用いて攪拌することにより、トナー母体粒子と、無機微粒子等の外添剤とを混合し、トナー母体粒子表面に付着させて本発明の電子写真用トナーを得る。
なお、このようにして得られた電子写真用トナーをキャリアと混合することで、二成分現像剤を得ることもできる。
The electrophotographic toner manufacturing method of the present invention preferably further includes an external addition step of obtaining a toner by attaching an external additive to the toner base particles.
In the external addition step, the toner base particles and the external additive such as inorganic fine particles are mixed by stirring using a stirrer such as a turbine-type stirrer having a deflector, a Henschel mixer, or a super mixer, and the surface of the toner base particles is mixed. The toner for electrophotography of the present invention is obtained by adhering.
A two-component developer can also be obtained by mixing the electrophotographic toner thus obtained with a carrier.

以上のようにして製造された本発明の電子写真用トナーは、着色剤の分散状態が非常に良好であり、結果としてトナー粒子の平均の帯電量に対し、極端に低帯電量もしくは高帯電量のトナー粒子の含有率が低く、比較的均一な帯電量分布を示す。   The electrophotographic toner of the present invention produced as described above has a very good dispersion state of the colorant. As a result, the charge amount is extremely low or high with respect to the average charge amount of the toner particles. The toner particle content is low, and the charge amount distribution is relatively uniform.

以下に、実施例に基づいて本発明をより詳細に説明するが、本発明はこれらの実施例により限定されるものではない。なお、原材料の配合量は重量部である。   Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In addition, the compounding quantity of a raw material is a weight part.

<実施例1>
・ポリエステル樹脂 89.0部
(三菱レイヨン社製、商品名:FC−433)
・シアン顔料粉末 5.0部
(大日精化工業社製、商品名:ブルー No.4)
・帯電制御剤 1.0部
(日本カーリット社製、商品名:LR−147)
・ポリプロピレンワックス 2.0部
(三洋化成工業社製、商品名:ビスコール550P)
・エステルワックス 2.0部
(日本油脂社製、商品名:WEP−8、融点78℃)
上記原材料をスーパーミキサーで20分間混合し、原材料混合物を得た。その後、前記原材料混合物を固相混練機(浅田鉄工株式会社製、商品名:ミラクルKCK−32型)に投入し、回転数60rpm、混練部温度80℃、フィード部、メータリング部、ベント部、ダイス部の温度80℃、樹脂温度100〜130℃、負荷電流18Aとして固相混練し、押出し、厚さ約1.5mmのシート状の混練物を得た。得られた混練物を冷却して粗粉砕した後、ジェットミルで粉砕し、乾式気流分級機で分級し、体積平均粒子径(Dv)が10.4、個数平均粒子径(Dn)が7.8μmのトナー母体粒子を得た。Dv/Dnは1.33であった。
<Example 1>
-Polyester resin 89.0 parts (Made by Mitsubishi Rayon Co., Ltd., trade name: FC-433)
-Cyan pigment powder 5.0 parts (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: Blue No. 4)
Charge control agent 1.0 part (manufactured by Nippon Carlit Co., Ltd., trade name: LR-147)
-Polypropylene wax 2.0 parts (manufactured by Sanyo Chemical Industries, trade name: Viscol 550P)
Ester wax 2.0 parts (manufactured by NOF Corporation, trade name: WEP-8, melting point 78 ° C.)
The raw materials were mixed with a super mixer for 20 minutes to obtain a raw material mixture. Thereafter, the raw material mixture was put into a solid-phase kneader (Asada Tekko Co., Ltd., trade name: Miracle KCK-32 type), rotation speed 60 rpm, kneading part temperature 80 ° C., feed part, metering part, vent part, Solid-phase kneading was performed at a die part temperature of 80 ° C., a resin temperature of 100 to 130 ° C., and a load current of 18 A, and extruded to obtain a sheet-like kneaded material having a thickness of about 1.5 mm. The obtained kneaded product is cooled and coarsely pulverized, and then pulverized by a jet mill and classified by a dry air classifier, and the volume average particle diameter (Dv) is 10.4 and the number average particle diameter (Dn) is 7. Toner base particles of 8 μm were obtained. Dv / Dn was 1.33.

次に、外添工程として前記トナー母体粒子100部に対し
・シリカ 0.2部
(クラリアントジャパン社製、平均一次粒子径17.5μm、比表面積140m/g)
・樹脂微粉末 0.3部
(AUSIMONT社製、商品名:HYLAR461)
・酸化チタン 0.5部
(日本アエロジル社製、一次粒子径10nm、BET比表面積65±10、処理剤オクチルシラン)
上記外添剤を300Lヘンシェルミキサーで回転数1220rpmで15分混合し、実施例1の電子写真用トナー(シアン)を得た。
また、シアン顔料粉末に代えて、
マゼンダ顔料粉末 5.0部
(大日精化工業社製、商品名:レッド No.8)
を用いたことを除いて上記と同一の方法により、実施例1の電子写真用トナー(マゼンダ)を得た。
Next, as an external addition step, 0.2 part of silica (100 parts by Clariant Japan, average primary particle diameter 17.5 μm, specific surface area 140 m 2 / g) with respect to 100 parts of the toner base particles.
-Resin fine powder 0.3 part (product name: HYLAR461, manufactured by AUSIMINT)
・ 0.5 parts of titanium oxide (manufactured by Nippon Aerosil Co., Ltd., primary particle diameter 10 nm, BET specific surface area 65 ± 10, treating agent octylsilane)
The above external additive was mixed with a 300 L Henschel mixer at a rotational speed of 1220 rpm for 15 minutes to obtain an electrophotographic toner (cyan) of Example 1.
Also, instead of cyan pigment powder,
Magenta pigment powder 5.0 parts (manufactured by Dainichi Seika Kogyo Co., Ltd., trade name: Red No. 8)
An electrophotographic toner (magenta) of Example 1 was obtained by the same method as above except that was used.

<実施例2>
固相混練機の混練部温度を100℃、負荷電流を17Aとしたことを除いて、実施例1と同一の方法により、実施例2の電子写真用トナー(シアン)および実施例2の電子写真用トナー(マゼンダ)を得た。
<Example 2>
The electrophotographic toner (cyan) of Example 2 and the electrophotographic image of Example 2 were prepared in the same manner as in Example 1 except that the kneading part temperature of the solid-phase kneader was 100 ° C. and the load current was 17 A. Toner (magenta) was obtained.

<実施例3>
固相混練機の回転数を120rpm、負荷電流を15Aとしたことを除いて、実施例1と同一の方法により、実施例3の電子写真用トナー(シアン)および実施例3の電子写真用トナー(マゼンダ)を得た。
<Example 3>
The electrophotographic toner (cyan) of Example 3 and the electrophotographic toner of Example 3 were prepared in the same manner as in Example 1 except that the rotation speed of the solid-phase kneader was 120 rpm and the load current was 15 A. (Magenta).

<実施例4>
顔料として、シアン顔料粉末やマゼンダ顔料粉末に代えて
カーボンブラック 5.0部
(三菱化学社製、商品名:三菱カーボン#25)
を用いたことを除いて実施例1と同一の方法により、実施例4の電子写真用トナー(ブラック)を得た。
<Example 4>
As a pigment, 5.0 parts of carbon black (Mitsubishi Chemical Corporation, trade name: Mitsubishi Carbon # 25) instead of cyan pigment powder and magenta pigment powder
The toner for electrophotography (black) of Example 4 was obtained in the same manner as in Example 1 except that was used.

<比較例1>
混練機を溶融混練機(池貝社製、商品名:PCM−35)として、その条件を、回転数100rpm、負荷電流10Aとしたことを除いて、実施例1と同様にして、比較例1の電子写真用トナー(シアン)および比較例1の電子写真用トナー(マゼンダ)を得た。
<Comparative Example 1>
The kneader was a melt kneader (trade name: PCM-35, manufactured by Ikegai Co., Ltd.), and the conditions were the same as in Example 1 except that the rotation speed was 100 rpm and the load current was 10 A. An electrophotographic toner (cyan) and an electrophotographic toner (magenta) of Comparative Example 1 were obtained.

<比較例2>
溶融混練機の混練部温度を100℃、負荷電流を12Aとしたことを除いて、比較例1と同一の方法により、比較例2の電子写真用トナー(シアン)および比較例2の電子写真用トナー(マゼンダ)を得た。
<Comparative example 2>
Except that the kneading part temperature of the melt kneader was 100 ° C. and the load current was 12 A, the same method as in Comparative Example 1 was used for the electrophotographic toner (cyan) in Comparative Example 2 and the electrophotographic toner in Comparative Example 2. Toner (magenta) was obtained.

<比較例3>
溶融混練機の回転数を200rpm、負荷電流を14Aとしたことを除いて、比較例1と同一の方法により、比較例3の電子写真用トナー(シアン)および比較例3の電子写真用トナー(マゼンダ)を得た。
<Comparative Example 3>
The electrophotographic toner of Comparative Example 3 (cyan) and the electrophotographic toner of Comparative Example 3 (cyan) and the electrophotographic toner of Comparative Example 3 were prepared in the same manner as in Comparative Example 1 except that the rotational speed of the melt kneader was 200 rpm and the load current was 14 A Magenta).

<比較例4>
顔料として、シアン顔料粉末やマゼンダ顔料粉末に代えて
カーボンブラック 5.0部
(三菱化学社製、商品名:三菱カーボン#25)
を用いたことを除いて比較例1と同一の方法により、比較例4の電子写真用トナー(ブラック)を得た。
実施例および比較例の主な条件を表1に示す。
<Comparative example 4>
As a pigment, 5.0 parts of carbon black (Mitsubishi Chemical Corporation, trade name: Mitsubishi Carbon # 25) instead of cyan pigment powder and magenta pigment powder
An electrophotographic toner (black) of Comparative Example 4 was obtained in the same manner as in Comparative Example 1 except that was used.
Table 1 shows the main conditions of Examples and Comparative Examples.

Figure 2007334201
Figure 2007334201

なお、実施例1〜4および比較例1〜4を通じて、フィード部、メータリング部、ベント部、ダイス部の温度は80℃、混練機内の原料の温度は100〜130℃である。   In addition, through Examples 1-4 and Comparative Examples 1-4, the temperature of a feed part, a metering part, a vent part, and a die part is 80 degreeC, and the temperature of the raw material in a kneading machine is 100-130 degreeC.

実施例および比較例の電子写真用トナーについて、最大分散径、ID(画像濃度)、細線の再現性を測定して、結果を表2に示した。   For the electrophotographic toners of Examples and Comparative Examples, the maximum dispersion diameter, ID (image density), and fine line reproducibility were measured, and the results are shown in Table 2.

Figure 2007334201
Figure 2007334201

<測定方法>
最大分散径
電子写真用トナーの電子走査写真をとり、粒状に現れた顔料のうち最大のものの長径を最大分散径(μm)とした。
ID(着色濃度)
反射濃度計(マクベス社製、商品名:RD914)で25mm×25mmのベタ画像の濃度を測定した。
A4用紙1000枚印刷時を印刷初期、A4用紙20000枚印刷時を印刷後期とした。
細線の再現性
非常に細かい格子模様の印刷を行い、正確に再現されているかを目視で確認した。
再現されているものを再現性有、線が潰れているものを再現性無とした。
<Measurement method>
Maximum Dispersion Diameter An electronic scanning photograph of the toner for electrophotography was taken, and the longest diameter of the largest pigment that appeared in the form of granules was defined as the maximum dispersion diameter (μm).
ID (color density)
The density of a solid image of 25 mm × 25 mm was measured with a reflection densitometer (manufactured by Macbeth, trade name: RD914).
The time of printing 1000 sheets of A4 paper was set as the initial printing stage, and the time of printing 20000 sheets of A4 paper was set as the latter printing stage.
Fine line reproducibility A very fine lattice pattern was printed, and it was visually confirmed that it was accurately reproduced.
The reproducible one was reproducible, and the one with a broken line was regarded as nonreproducible.

<評価結果>
実施例1〜4は、最大分散径が2μm以下で顔料の分散が良好である。また、結果として均一な帯電量分布を示し、実用上問題なかった。
また、IDも印刷初期と印刷後期の差は0.01〜0.04であって極めて安定している。
さらに、細線の再現性が認められた。
これに対し、比較例1〜3は、最大分散径が5μm以上で顔料の分散が不十分である。
比較例4は0.6であるが、実施例4の0.2と比べるとやや劣る。
また、比較例1〜4のIDは印刷初期と印刷後期の差は0.06〜0.20であって濃度の低下が顕著である。
さらに、比較例1〜4では、いずれも細線の再現性が認められなかった。
以上のように、本発明によれば、マスターバッチを用いなくても、画像の着色濃度や画質に優れたカラートナーおよびブラックトナーを提供できる。
<Evaluation results>
In Examples 1 to 4, the maximum dispersion diameter is 2 μm or less, and the dispersion of the pigment is good. Further, as a result, a uniform charge amount distribution was shown, and there was no practical problem.
Also, the ID is extremely stable with a difference of 0.01 to 0.04 between the initial printing stage and the late printing stage.
Furthermore, the reproducibility of fine lines was recognized.
On the other hand, Comparative Examples 1 to 3 have a maximum dispersion diameter of 5 μm or more and insufficient pigment dispersion.
Although the comparative example 4 is 0.6, it is a little inferior compared with 0.2 of Example 4.
Further, in the IDs of Comparative Examples 1 to 4, the difference between the initial printing stage and the late printing stage is 0.06 to 0.20, and the density reduction is remarkable.
Further, in Comparative Examples 1 to 4, the reproducibility of fine lines was not recognized.
As described above, according to the present invention, it is possible to provide a color toner and a black toner excellent in color density and image quality of an image without using a master batch.

Claims (9)

少なくとも結着樹脂および着色剤を含有する原料を、固相混練機を用いて固相混練して混練物を得る固相混練工程と、前記混練物を冷却して粉砕分級してトナー母体粒子を得る粉砕分級工程とを有することを特徴とする電子写真用トナーの製造方法。 A solid phase kneading step for obtaining a kneaded product by solid phase kneading a raw material containing at least a binder resin and a colorant using a solid phase kneader, and cooling and classifying the kneaded product to obtain toner base particles A method for producing a toner for electrophotography, comprising: a pulverizing and classifying step. さらに、前記トナー母体粒子に外添剤を付着させてトナーを得る外添工程を有することを特徴とする請求項1記載の電子写真用トナーの製造方法。 2. The method for producing an electrophotographic toner according to claim 1, further comprising an external addition step of obtaining a toner by attaching an external additive to the toner base particles. 前記着色剤は、カラー顔料粉末であることを特徴とする請求項1記載の電子写真用トナーの製造方法。 2. The method for producing an electrophotographic toner according to claim 1, wherein the colorant is a color pigment powder. 前記固相混練機の混練部温度は30〜200℃であることを特徴とする請求項1記載の電子写真用トナーの製造方法。 The method for producing an electrophotographic toner according to claim 1, wherein the temperature of the kneading part of the solid-phase kneader is 30 to 200 ° C. 前記固相混練機のフィード部、メータリング部、ベント部、ダイス部の温度は、30〜200℃であることを特徴とする請求項1または4記載の電子写真用トナーの製造方法。 5. The method for producing an electrophotographic toner according to claim 1, wherein the temperature of the feed portion, metering portion, vent portion, and die portion of the solid-phase kneader is 30 to 200 ° C. 6. 前記固相混練機内の原料の温度は50〜200℃であることを特徴とする請求項1、4、5のいずれか記載の電子写真用トナーの製造方法。 6. The method for producing an electrophotographic toner according to claim 1, wherein the temperature of the raw material in the solid-phase kneader is 50 to 200.degree. 前記固相混練機の回転数は20〜200rpmであることを特徴とする請求項1、4、5、6のいずれか記載の電子写真用トナーの製造方法。 The method for producing an electrophotographic toner according to claim 1, wherein the solid-phase kneader has a rotation speed of 20 to 200 rpm. 前記固相混練機の負荷電流は10〜30Aであることを特徴とする請求項1、4、5、6、7のいずれか記載の電子写真用トナーの製造方法。 The method for producing an electrophotographic toner according to any one of claims 1, 4, 5, 6, and 7, wherein a load current of the solid-phase kneader is 10 to 30A. 請求項1ないし8のいずれか記載の電子写真用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。 9. An electrophotographic toner produced by the method for producing an electrophotographic toner according to claim 1.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012063572A (en) * 2010-09-16 2012-03-29 Ricoh Co Ltd Method of manufacturing toner and toner

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0292B2 (en) * 1981-12-07 1990-01-05 Pii Eichi Kogyo Jugengaisha
JP2002347020A (en) * 2001-05-29 2002-12-04 Kck Oyo Gijutsu Kenkyusho:Kk Method and apparatus for kneading ultra-fine powder and resin
JP2006075668A (en) * 2004-09-07 2006-03-23 Kck Oyo Gijutsu Kenkyusho:Kk Method for preparing surface-modified fine particle and method and apparatus for producing functional fine particle-dispersed resin chip by using the method
JP2006077062A (en) * 2004-09-08 2006-03-23 Toyo Ink Mfg Co Ltd Method for producing pigment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0292B2 (en) * 1981-12-07 1990-01-05 Pii Eichi Kogyo Jugengaisha
JP2002347020A (en) * 2001-05-29 2002-12-04 Kck Oyo Gijutsu Kenkyusho:Kk Method and apparatus for kneading ultra-fine powder and resin
JP2006075668A (en) * 2004-09-07 2006-03-23 Kck Oyo Gijutsu Kenkyusho:Kk Method for preparing surface-modified fine particle and method and apparatus for producing functional fine particle-dispersed resin chip by using the method
JP2006077062A (en) * 2004-09-08 2006-03-23 Toyo Ink Mfg Co Ltd Method for producing pigment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012063572A (en) * 2010-09-16 2012-03-29 Ricoh Co Ltd Method of manufacturing toner and toner

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