JP2009229759A - Manufacturing method of electrophotographic toner - Google Patents

Manufacturing method of electrophotographic toner Download PDF

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Publication number
JP2009229759A
JP2009229759A JP2008074614A JP2008074614A JP2009229759A JP 2009229759 A JP2009229759 A JP 2009229759A JP 2008074614 A JP2008074614 A JP 2008074614A JP 2008074614 A JP2008074614 A JP 2008074614A JP 2009229759 A JP2009229759 A JP 2009229759A
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toner
toner particles
amount
average particle
particle size
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Masahiro Maeda
正博 前田
Yutaka Yamazaki
豊 山崎
Tadahiro Tsubaki
忠洋 椿
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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 manufacturing method of an electrophotographic toner can easily obtain toner characteristics for meeting demands of users by enabling easy adjustment of the developing amount. <P>SOLUTION: The method includes a step of mixing first toner particles and second toner particles having the same softening point as that of the first toner particles and a volume average particle size smaller than that of the first toner particles. The developing amount is controlled by adjusting the compounding amount of the first toner particles and the second toner particles. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、電子写真用トナーの製造方法に係り、特に、現像量の調整を可能とする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 capable of adjusting the development amount.

近年、プリンタは、モノクロからカラー化への転換が進んでいる。特に、オフィスで使用されるプリンタは、一般的に複数の部署で共通に使用されるため、印刷部数が多くなり、そのため、高速化や耐久性、ランニングコスト等の理由から、電子写真方式のレーザープリンタが選ばれる。   In recent years, printers have been changing from monochrome to color. In particular, printers used in offices are commonly used by multiple departments, so the number of prints increases. Therefore, for reasons such as higher speed, durability, and running costs, electrophotographic lasers are used. A printer is selected.

このような印刷の高速化、耐久性、ランニングコスト、その他の品質を満足するために、トナーには様々な特性が要求される。しかも、ユーザーの使用環境、使用頻度や印字内容、印字媒体も多様であり、全てのユーザーが満足できるプリンタを提供することは非常に困難であるのが現状である。   In order to satisfy such high-speed printing, durability, running cost, and other qualities, various properties are required for the toner. In addition, there are various usage environments, usage frequencies, printing contents, and printing media of users, and it is very difficult to provide a printer that can satisfy all users.

ユーザーの具体的な使用状況として、例えば、カラー印字はほとんど行わず、印字率の低いモノクロ印字をメインに行う場合や、広告などの印字率の高いカラー印刷を連続して印字する場合がある。このような極端な使い方をするユーザーも珍しくはないので、トナーの劣化度合いも大きく異なることとなる。   As a specific usage situation of the user, for example, there is a case where color printing is hardly performed and monochrome printing with a low printing rate is mainly performed, or color printing with a high printing rate such as an advertisement is continuously printed. Since it is not uncommon for users to use such extreme usage, the degree of toner degradation will vary greatly.

更に、上記のようなモノクロ印字を多く行なうユーザーからは、印字の少ないカラートナーの消費量を少なくできないかとの要求がある。しかし、現像量を抑えたトナーでは、画像濃度が落ちてしまい、プリンタで出力された画像を例えば広告として使用するユーザーを満足させることはできない。   Furthermore, there is a request from users who frequently perform monochrome printing as described above to reduce the consumption of color toner with little printing. However, with toner with a reduced development amount, the image density drops, and a user who uses an image output by a printer as an advertisement cannot be satisfied.

プリンタのマニュアルの設定により、現像に関係するパラメーターを調整し、ある程度、好みの画像に調整することは可能であるが、調整範囲には限界があり、ユーザーにとって満足し得る画像が得られるとは言えない。また、特定のユーザー向けに、トナーをカスタマイズすることもできるが、ユーザー数が多くなった場合、トナーの品種が増えてしまい、生産計画等の調整が困難となる。   It is possible to adjust the parameters related to development by adjusting the settings of the manual of the printer and adjust the image to your liking to some extent, but the adjustment range is limited, and it is possible to obtain an image that is satisfactory for the user I can not say. In addition, although it is possible to customize the toner for a specific user, when the number of users increases, the type of toner increases, making it difficult to adjust the production plan and the like.

なお、複数種のトナーを混合して、特定の特性を有するトナーを得ることが知られている。例えば、軟化点が低く、粒径が大きいトナー粒子と、軟化点が高く、粒径が小さいトナー粒子を混合して、ブロッキング性を向上させたトナー(例えば、特許文献1及び2参照)や、粒径が大きく、帯電量の絶対値が大きいトナーと、粒径が小さく、帯電量の絶対値が小さいトナーを混合した、長期にわたり高画像濃度が得られるトナー(例えば、特許文献3参照)がある。   It is known to obtain a toner having specific characteristics by mixing a plurality of types of toner. For example, a toner having a low softening point and a large particle size mixed with a toner particle having a high softening point and a small particle size to improve blocking properties (see, for example, Patent Documents 1 and 2), A toner that can obtain a high image density over a long period of time by mixing a toner having a large particle size and a large absolute value of charge amount and a toner having a small particle size and a small absolute value of charge amount (for example, see Patent Document 3). is there.

しかし、粒径が大きいトナー粒子と小さいトナーとで軟化点を変えた前者のトナーでは、両トナーの材質が異なることから帯電率が相違し、帯電が不均一になり、逆に静電的に凝集が生じ易いという問題がある。また、通常、粒径が大きいトナーは、帯電量が小さいことから、粒径が大きいトナーの帯電量が多いという後者のトナーを得るには、樹脂の種類や帯電制御剤の量を変えたりするという特別の操作が必要であり、またそのような操作によっても現像量の変化の幅は狭く、特定の用途に適合する現像量を示すトナーを得ることは困難であった。
特開昭60−188957号公報 特開平10−177274号公報 特開平11−24311号公報
However, in the former toner in which the softening point is changed between a toner particle having a large particle size and a toner having a small particle size, the charge rates are different because the materials of the two toners are different, and the charging becomes uneven. There is a problem that aggregation easily occurs. In general, a toner having a large particle size has a small charge amount. Therefore, in order to obtain the latter toner having a large charge amount of a toner having a large particle size, the type of resin or the amount of charge control agent is changed. Such a special operation is necessary, and even by such an operation, the range of change in the development amount is narrow, and it has been difficult to obtain a toner exhibiting a development amount suitable for a specific application.
JP-A-60-188957 JP-A-10-177274 JP-A-11-24311

本発明は、以上のような事情の下になされ、現像量の調整を容易に行なうことが可能であり、ユーザーの要望に応えるトナー特性を容易に得ることの出来る電子写真用トナーの製造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 provides a method for producing an electrophotographic toner capable of easily adjusting a developing amount and easily obtaining toner characteristics meeting a user's request. The purpose is to provide.

上記課題を解決するため、本発明の一態様は、第1のトナー粒子と、前記第1のトナー粒子と同一の軟化点及び前記第1のトナー粒子よりも小さい体積平均粒径を有する第2のトナー粒子とを混合する工程を具備し、前記第1のトナー粒子と第2のトナー粒子の配合量を調整することにより現像量を制御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-described problem, an embodiment of the present invention provides a first toner particle, a second softening point that is the same as that of the first toner particle, and a second volume average particle size that is smaller than that of the first toner particle. A method for producing an electrophotographic toner, comprising: a step of mixing the toner particles; and a development amount is controlled by adjusting a blending amount of the first toner particles and the second toner particles. provide.

このような電子写真用トナーの製造方法において、前記第2のトナー粒子が含む外添剤の添加量を、前記第1のトナー粒子が含む外添剤の添加量よりも多くすることが出来る。   In such an electrophotographic toner manufacturing method, the amount of the external additive contained in the second toner particles can be made larger than the amount of the external additive contained in the first toner particles.

また、前記第2のトナー粒子の帯電量を、前記第1のトナー粒子の帯電量よりも大きくすることが出来る。   Further, the charge amount of the second toner particles can be made larger than the charge amount of the first toner particles.

また、前記第1のトナーと第2のトナーの体積平均粒径の差を、2μm以上とすることが出来る。   The difference in volume average particle diameter between the first toner and the second toner can be 2 μm or more.

本発明の一態様によると、現像量の調整を容易に行なうことが可能であり、ユーザーの要望に応えるトナー特性を容易に得ることの出来る電子写真用トナーの製造方法が提供される。   According to one embodiment of the present invention, there is provided a method for producing an electrophotographic toner that can easily adjust the development amount and can easily obtain toner characteristics that meet the user's request.

以下、本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described.

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、体積平均粒径が異なり、軟化点が同一の複数のトナーを混合することを特徴とする。即ち、軟化点が同一の、同一材料から構成され、体積平均粒径が異なる複数種のトナーを別々に製造した後、混合して、1種類の電子写真用トナーを得るものである。   An electrophotographic toner manufacturing method according to an embodiment of the present invention is characterized in that a plurality of toners having different volume average particle diameters and the same softening point are mixed. That is, a plurality of types of toners having the same softening point and made of the same material and having different volume average particle diameters are separately manufactured and then mixed to obtain one type of electrophotographic toner.

本発明者らは、平均粒径が小さいトナーは現像量が少ないのに対し、平均粒径が大きいトナーは現像量が多いので、これらのトナーを混合することにより、現像量を適宜、制御できることを見出した。即ち、平均粒径が小さいトナーに対し、平均粒径が大きいトナーの混合割合を増加させることにより、現像量を増加させることができることを見出した。このような知見に基づき、モノクロ印字のように少ない現像量が求められる用途には、平均粒径が大きいトナーの混合割合を少なくし、カラー印刷のように多い現像量が求められる用途には、平均粒径が大きいトナーの混合割合を多くするというように、用途に適合させてトナーの現像量を制御することが可能である。   The present inventors have developed a toner with a small average particle size with a small development amount, whereas a toner with a large average particle size has a large development amount. By mixing these toners, the development amount can be appropriately controlled. I found. That is, it has been found that the development amount can be increased by increasing the mixing ratio of the toner having a large average particle diameter with respect to the toner having a small average particle diameter. Based on such knowledge, for applications where a small amount of development is required such as monochrome printing, the mixing ratio of toner having a large average particle size is reduced, and for applications where a large amount of development is required such as color printing, It is possible to control the development amount of the toner in accordance with the application, such as increasing the mixing ratio of the toner having a large average particle diameter.

特に、平均粒径が小さいトナーに対しては外添剤の量を多くし、平均粒径が大きいトナーに対しては外添剤の量を少なくすることにより、トナー全体として、流動性を揃えることができる。   In particular, by increasing the amount of the external additive for a toner having a small average particle size and decreasing the amount of the external additive for a toner having a large average particle size, the fluidity of the entire toner is made uniform. be able to.

上述したように、軟化点が低く、粒径が大きいトナー粒子と、軟化点が高く、粒径が小さいトナー粒子を混合して、ブロッキング性を向上させたトナーが知られているが、軟化点を変えるには結着樹脂の種類を変える必要があり、結着樹脂の種類を変えると帯電率が相違することから、静電的に凝集が生じ易いという問題がある。また、粒径が大きく、帯電量の絶対値が大きいトナーと、粒径が小さく、帯電量の絶対値が小さいトナーを混合したトナーも知られているが、本発明に係るトナーは、逆に、粒径の大きいトナーの帯電量が小さい。通常、粒径が大きいトナーは、帯電量が小さいので、本発明に係るトナーは、何ら樹脂の材質を変えることなく、同様の材質のトナーを混合することで足りる。   As described above, toners having a low softening point and a large particle size and toner particles having a high softening point and a small particle size are mixed to improve blocking properties. Therefore, it is necessary to change the type of the binder resin. If the type of the binder resin is changed, the charge rate is different. Further, a toner in which a toner having a large particle size and a large absolute value of charge amount and a toner having a small particle size and a small absolute value of charge amount are mixed is also known. The charge amount of toner having a large particle size is small. In general, a toner having a large particle size has a small charge amount, and therefore the toner according to the present invention can be obtained by mixing toners of the same material without changing the material of the resin.

従って、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、簡単かつ低コストで、所望の現像量のトナーを得ることが出来るという優れた効果を奏する。   Therefore, the method for producing an electrophotographic toner according to an embodiment of the present invention has an excellent effect that a toner having a desired development amount can be obtained easily and at low cost.

なお、複数種のトナー体積平均粒径の差は、2μm以上であることが望ましい。体積平均粒径の差が2μm未満では、トナーの現像量を制御し得る範囲が狭く、望ましくない。   The difference in the volume average particle size of the plurality of types of toners is desirably 2 μm or more. If the difference in volume average particle diameter is less than 2 μm, the range in which the toner development amount can be controlled is narrow, which is not desirable.

以下、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ついて、具体的に説明する。   Hereinafter, a method for producing an electrophotographic toner according to an embodiment of the present invention will be specifically described.

以上説明したように、本発明の一実施形態において、混合する前の平均粒径の小さいトナー及び平均粒径の大きいトナーは、いずれもそれ自体は従来のトナーと同様のものであり、従来公知の方法により製造することが出来る。   As described above, in the embodiment of the present invention, the toner having a small average particle diameter and the toner having a large average particle diameter before mixing are both the same as those of the conventional toner, and are conventionally known. It can manufacture by the method of.

まず、結着樹脂、着色剤、帯電制御剤及び離型剤等を含む原料混合物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。   First, a raw material mixture containing a binder resin, a colorant, a charge control agent, a release agent and the like is mixed using 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.

使用可能な結着樹脂としては、公知のものを含む広い範囲から選択することができる。具体的には、ポリスチレン、スチレン−アクリル酸エステル共重合体、スチレン−メタクリル酸共重合体、およびスチレン−ブタジエン共重合体などのスチレン系樹脂をはじめ、飽和ポリエステル樹脂、不飽和ポリエステル樹脂、エポキシ樹脂、フェノール樹脂、クマロン樹脂、キシレン樹脂、塩化ビニル樹脂、ポリオレフィン樹脂などが例示でき、これらの樹脂を二種類以上組み合わせて用いてもよい。なお、これらの樹脂のうち、ポリエステル系樹脂が好ましい。   Usable binder resins can be selected from a wide range including known ones. Specific examples include styrene resins such as polystyrene, styrene-acrylic acid ester copolymers, styrene-methacrylic acid copolymers, and styrene-butadiene copolymers, saturated polyester resins, unsaturated polyester resins, and epoxy resins. Phenolic resin, coumarone resin, xylene resin, vinyl chloride resin, polyolefin resin and the like can be exemplified, and two or more of these resins may be used in combination. Of these resins, polyester resins are preferred.

帯電制御剤及び離型剤としては、通常、電子写真用トナーに使用される任意のものを使用可能である。   As the charge control agent and the release agent, any of those usually used for electrophotographic toners can be used.

原料混合物は、次いで混練機に供給され、そこで溶融混練される。混練機としては、二軸押出し混練機及び単軸押出し混練機等の押出し混練機、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のオープンロール型混練機等、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 a kneader where it is melt kneaded. As the kneading machine, any type of extrusion kneading machine such as a twin-screw extrusion kneading machine and a single-screw extrusion kneading machine, an open roll type kneading machine such as a continuous two-roll mill, a continuous three-roll mill, and a batch roll mill can be used. Things can be used.

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、分級されて、所定の平均粒径の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。本発明の一実施形態では、粉砕分級の条件を変えることにより、異なる平均粒径、特に2μm以上の平均粒径の差を有する複数種のトナー粒子母体を生成する。   The melt-kneaded product discharged from the kneader is usually cooled, pulverized, and classified according to a method used for toner production to obtain a toner particle matrix having a predetermined average particle diameter. 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. In one embodiment of the present invention, by changing the pulverization classification conditions, a plurality of types of toner particle bases having different average particle diameters, in particular, average particle diameter differences of 2 μm or more are generated.

このようにして得た、異なる平均粒径の複数種のトナー粒子母体のそれぞれに、シリコーンオイルにより疎水化処理された無機粒子を加え、混合・攪拌することにより、異なる平均粒径の複数種の電子写真用トナーが得られる。この場合、平均粒径の大きいトナー粒子が含む外添剤の添加量を、平均粒径が小さいトナー粒子が含む外添剤の添加量よりも少なくすることが望ましい。そうすることにより、流動性を合せることが出来、流動性が均一なトナーを得ることが出来るからである。   By adding inorganic particles hydrophobized with silicone oil to each of a plurality of types of toner particle bases having different average particle diameters obtained in this manner, and mixing and stirring, a plurality of types of toner particles having different average particle diameters are mixed. An electrophotographic toner is obtained. In this case, it is desirable to make the addition amount of the external additive contained in the toner particles having a large average particle diameter smaller than the addition amount of the external additive contained in the toner particles having a small average particle diameter. By doing so, the fluidity can be matched, and a toner with uniform fluidity can be obtained.

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では、このようにして、異なる平均粒径の電子写真用トナーを複数種製造した後、これらを混合する。混合は、V型ブレンダー等の通常の混合機を用いて行うことが出来る。   In the method for producing an electrophotographic toner according to an embodiment of the present invention, a plurality of electrophotographic toners having different average particle diameters are produced as described above, and then mixed. Mixing can be performed using a normal mixer such as a V-type blender.

実施例
以下、本発明の実施例及び比較例を示し、本発明についてより具体的に説明する。
Examples Hereinafter, examples and comparative examples of the present invention will be shown, and the present invention will be described more specifically.

まず、実施例及び比較例で用いる平均粒径9μmのトナーと、平均粒径6μmのトナーを、以下のように作成した。   First, a toner having an average particle diameter of 9 μm and a toner having an average particle diameter of 6 μm used in Examples and Comparative Examples were prepared as follows.

<平均粒径9μmトナーの作製>
結着樹脂としてポリエステル樹脂(軟化点135℃)92質量部、着色剤としてC.Iピグメントレッド57:1を4質量部、荷電制御剤「LR−147」(日本カーリット社製:有機ホウ素化合物)1質量部、及び離型剤「カルナバワックス1号粉末」(加藤洋行)3質量部をヘンシェルミキサー(三井鉱山社製)を用いて混合した。
<Preparation of toner with an average particle size of 9 μm>
92 parts by mass of a polyester resin (softening point 135 ° C.) as a binder resin and C.I. 4 parts by weight of I Pigment Red 57: 1, 1 part by weight of the charge control agent “LR-147” (manufactured by Nippon Carlit Co., Ltd .: organoboron compound), and 3 parts by weight of the release agent “Carnauba wax No. 1 powder” (Yoyuki Kato) The parts were mixed using a Henschel mixer (Mitsui Mining Co., Ltd.).

混合粉体を2軸混練機(スクリュウ径43mm、L/D=34)で溶融混練し、延伸し、冷却し、ロートプレックス(ホソカワミクロン社製、2mmスクリーン)で粗砕した後、衝突式粉砕機・風力分級機にて、トナーの体積平均粒径が9.0μmになるように粉砕分級を行い、着色粒子を得た。   The mixed powder is melt-kneaded with a twin-screw kneader (screw diameter: 43 mm, L / D = 34), stretched, cooled, and coarsely crushed with a Rotoplex (manufactured by Hosokawa Micron Co., Ltd., 2 mm screen). -Using a wind classifier, pulverization classification was performed so that the volume average particle diameter of the toner was 9.0 μm, and colored particles were obtained.

得られた着色粒子100質量部に外添剤として、「NY50」(日本アエロジル社製:疎水性シリカ)を2質量部、及び「H3004」(クラリアント社製:疎水性シリカ)を0.2質量部添加し、ヘンシェルミキサーで混合し、トナーを得た。得られたトナーの軟化点は129.6℃であった。   As external additives, 2 parts by mass of “NY50” (manufactured by Nippon Aerosil Co., Ltd .: hydrophobic silica) and 0.2 part by mass of “H3004” (manufactured by Clariant: hydrophobic silica) are added to 100 parts by mass of the obtained colored particles. Partly added and mixed with a Henschel mixer to obtain a toner. The obtained toner had a softening point of 129.6 ° C.

<平均粒径6μmトナーの作製>
結着樹脂としてポリエステル樹脂(軟化点135℃)92質量部、着色剤としてC.Iピグメントレッド57:1を4質量部、荷電制御剤として「LR−147」(日本カーリット社製:有機ホウ素化合物)1質量部、及び離型剤として「カルナバワックス1号粉末」(加藤洋行)3質量部をヘンシェルミキサー(三井鉱山社製)を用いて混合した。
<Preparation of toner with an average particle diameter of 6 μm>
92 parts by mass of a polyester resin (softening point 135 ° C.) as a binder resin and C.I. 4 parts by weight of I pigment red 57: 1, 1 part by weight of “LR-147” (manufactured by Nippon Carlit Co., Ltd .: organoboron compound) as a charge control agent, and “Carnauba wax No. 1 powder” (Yoyuki Kato) as a release agent Three parts by mass were mixed using a Henschel mixer (Mitsui Mining Co., Ltd.).

混合粉体を2軸混練機(スクリュウ径43mm、L/D=34)で溶融混練し、延伸し、冷却し、ロートプレックス(ホソカワミクロン社製、2mmスクリーン)で粗砕した後、衝突式粉砕機・風力分級機にて、トナーの体積平均粒径が6.0μmになるように粉砕分級を行い、着色粒子を得た。   The mixed powder is melt-kneaded with a twin-screw kneader (screw diameter: 43 mm, L / D = 34), stretched, cooled, and coarsely crushed with a Rotoplex (manufactured by Hosokawa Micron Co., Ltd., 2 mm screen). -Using a wind classifier, pulverization classification was performed so that the volume average particle diameter of the toner was 6.0 μm, and colored particles were obtained.

得られた着色粒子100質量部に外添剤として「NY50」(日本アエロジル社製:疎水性シリカ)を3質量部、及び「H3004」(クラリアント社製:疎水性シリカ)を0.5質量部添加し、ヘンシェルミキサーで混合し、トナーを得た。得られたトナーの軟化点は129.5℃であった。   3 parts by mass of “NY50” (manufactured by Nippon Aerosil Co., Ltd .: hydrophobic silica) and 0.5 part by mass of “H3004” (manufactured by Clariant: hydrophobic silica) are added to 100 parts by mass of the obtained colored particles. The toner was added and mixed with a Henschel mixer to obtain a toner. The obtained toner had a softening point of 129.5 ° C.

このトナーは、前記9.0μmのトナーと比較し、トナー材料の組成は同様であり、従って軟化点がほぼ同一であるが、トナーの平均粒径と外添剤の量が異なるものである。   Compared with the 9.0 μm toner, the toner has the same composition of the toner material, and therefore the softening point is almost the same, but the average particle diameter of the toner and the amount of the external additive are different.

以上のように得られた平均粒径9.0μmのトナーと平均粒径6.0μmのトナーを下記表に示すような割合に計量した後、容量10LのV型混合機に収容し、回転速度30rpmで3分間混合し、9種のトナー試料を得た。   The toner having an average particle diameter of 9.0 μm and the toner having an average particle diameter of 6.0 μm obtained as described above were weighed in the proportions shown in the following table, and then stored in a V-type mixer having a capacity of 10 L, and the rotation speed 9 toner samples were obtained by mixing at 30 rpm for 3 minutes.

比較例
結着樹脂として軟化点(145℃)を有する(ポリエステル)樹脂を用いたことを除いて、上記と同様にして平均粒径6μmトナーを作製した。このトナーを上記のようにして得た平均粒径9μmトナーと混合し、9種のトナー試料を得た。
Comparative Example A toner having an average particle diameter of 6 μm was prepared in the same manner as described above except that a (polyester) resin having a softening point (145 ° C.) was used as the binder resin. This toner was mixed with the toner having an average particle diameter of 9 μm obtained as described above, and nine toner samples were obtained.

得られたトナー試料について物性測定を行い、かつ粒径及び帯電量の測定を行った。   The obtained toner sample was measured for physical properties, and the particle size and charge amount were measured.

なお、結着樹脂及びトナーの軟化点は、以下の装置を用い、以下の条件で測定した。   The softening point of the binder resin and toner was measured using the following apparatus under the following conditions.

装置:フローテスター(島津製作所製、CFT−500D)
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した。
Apparatus: Flow tester (manufactured by Shimadzu Corporation, CFT-500D)
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 flowed out was taken as the softening point.

<物性等評価条件>
1.粒径
以下の装置を用い、以下の条件で測定した。
<Evaluation conditions for physical properties>
1. The particle size was measured under the following conditions using the following apparatus.

装置:マルチサイザーIII(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した。
Device: Multisizer III (Coulter)
Sample: A small amount of sample, purified water, and a surfactant were placed in a beaker and dispersed with an ultrasonic cleaner.

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

2.帯電量
以下の装置を用い、以下の条件で測定した。
2. Charge amount Using the following apparatus, measurement was performed under the following conditions.

装置:ブローオフ帯電量測定装置(東芝ケミカル社製)
ブロー圧:1kgf/cm
ブロー時間:20sec
メッシュ:400メッシュ
サンプル量:200mg
デベ化条件
キヤリア(パウダーテック社FT−150)を9.7gとトナーを0.3gを20ccのスクリュウ管に入れ、ボールミルにセットし、100rpmで10分間撹拌した。測定環境は25℃、50%RHの環境下で行った。
Device: Blow-off charge measurement device (Toshiba Chemical)
Blow pressure: 1kgf / cm 2
Blow time: 20 sec
Mesh: 400 mesh Sample amount: 200 mg
Debedding conditions 9.7 g of carrier (Powdertech FT-150) and 0.3 g of toner were placed in a 20 cc screw tube, set in a ball mill, and stirred at 100 rpm for 10 minutes. The measurement environment was 25 ° C. and 50% RH.

試験−1(現像量)
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(株)製:カラープリンタ毎分29枚機、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、ベタ画像を印字させ、印字途中に扉を開けることで、強制停止させ、トナーが未定着の画像を採取した。得られた未定着画像上のトナーを掃除機で吸い取り、印字面積とトナー質量より、現像量(mg/cm)を求めた。
Test-1 (development amount)
Non-magnetic one-component developing device “Casio Page Prest N-5” (manufactured by Casio Computer Co., Ltd .: 29 color printers per minute, process speed 129 mm / sec) with toner mounted in normal environment (25 ° C., 50% In (RH), a solid image was printed, and the door was opened in the middle of printing to forcibly stop, and an image with no toner fixed was collected. The toner on the obtained unfixed image was sucked with a vacuum cleaner, and the development amount (mg / cm 2 ) was determined from the printing area and the toner mass.

試験−2(画像濃度)
試験−1と同様の装置を用い、ベタ画像を印字する。X−Rite社の分光測色濃度計(X−Rite938)を用いて、画像濃度を測定した。X−Riteの設定は、D65光源m、視野角2度、測定径4mmで行った。
Test-2 (image density)
A solid image is printed using the same apparatus as in Test-1. The image density was measured using a spectrocolorimetric densitometer (X-Rite 938) manufactured by X-Rite. X-Rite was set with a D65 light source m, a viewing angle of 2 degrees, and a measurement diameter of 4 mm.

以上の測定結果及び試験結果を下記表1及び2に示す。

Figure 2009229759
The above measurement results and test results are shown in Tables 1 and 2 below.
Figure 2009229759

Figure 2009229759
Figure 2009229759

上記表1から、体積平均粒径が6μmのトナーと9μmのトナーを混合して得たトナーにおいて、平均粒径9μmのトナーの比率が増えると、現像量が増えることがわかった。現像量が増えると、画像濃度が高くなる傾向が見られた。このようにして、粒径の異なるトナーの混合割合を変えることにより、現像量の調整が可能であり、ユーザーの要請に適合した現像量を示すトナーを得ることが出来ることがわかる。   From Table 1 above, it was found that in the toner obtained by mixing the toner having a volume average particle diameter of 6 μm and the toner having 9 μm, the development amount increases as the ratio of the toner having an average particle diameter of 9 μm increases. As the development amount increased, the image density tended to increase. Thus, it can be seen that by changing the mixing ratio of toners having different particle diameters, the development amount can be adjusted, and a toner having a development amount suitable for the user's request can be obtained.

これに対し、体積平均粒径が異なり、かつ軟化点の異なる結着樹脂を用いたトナーを混合した場合には、上記表2に示すように、混合比率により、軟化点が変動するため、トナーの軟化点が高い場合には、コールドオフセットが発生してしまい、実用的に使用できる配合比率の幅が狭くなり、結果として、現像量の調整幅が狭くなってしまうことがわかる。   On the other hand, when toners using binder resins having different volume average particle diameters and different softening points are mixed, the softening point varies depending on the mixing ratio as shown in Table 2 above. When the softening point is high, a cold offset occurs, and the width of the blending ratio that can be practically used is narrowed. As a result, the adjustment range of the development amount is narrowed.

Claims (4)

第1のトナー粒子と、前記第1のトナー粒子と同一の軟化点及び前記第1のトナー粒子よりも小さい体積平均粒径を有する第2のトナー粒子とを混合する工程を具備し、前記第1のトナー粒子と第2のトナー粒子の配合量を調整することにより現像量を制御することを特徴とする電子写真用トナーの製造方法。   Mixing the first toner particles with the second toner particles having the same softening point as the first toner particles and a volume average particle size smaller than the first toner particles; A method for producing an electrophotographic toner, wherein the development amount is controlled by adjusting a blending amount of the first toner particles and the second toner particles. 前記第2のトナー粒子が含む外添剤の添加量は、前記第1のトナー粒子が含む外添剤の添加量よりも多い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。   2. The electrophotographic toner according to claim 1, wherein the amount of the external additive contained in the second toner particles is larger than the amount of the external additive contained in the first toner particles. Method. 前記第2のトナー粒子の帯電量は、前記第1のトナー粒子の帯電量よりも大きいことを特徴とする請求項1又は2に記載の電子写真用トナーの製造方法。   3. The method for producing an electrophotographic toner according to claim 1, wherein the charge amount of the second toner particles is larger than the charge amount of the first toner particles. 前記第1のトナーと第2のトナーの体積平均粒径の差は、2μm以上であることを特徴とする請求項1〜3のいずれかに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 a difference in volume average particle diameter between the first toner and the second toner is 2 μm or more.
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JP2015096884A (en) * 2013-11-15 2015-05-21 富士ゼロックス株式会社 Electrostatic charge image developer, process cartridge, image forming method, and image forming apparatus

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JP2015055804A (en) * 2013-09-13 2015-03-23 京セラドキュメントソリューションズ株式会社 Toner for electrostatic latent image development, and manufacturing method of toner for electrostatic latent image development
JP2015096884A (en) * 2013-11-15 2015-05-21 富士ゼロックス株式会社 Electrostatic charge image developer, process cartridge, image forming method, and image forming apparatus

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