JPS6026955A - Magnetic toner - Google Patents
Magnetic tonerInfo
- Publication number
- JPS6026955A JPS6026955A JP58134280A JP13428083A JPS6026955A JP S6026955 A JPS6026955 A JP S6026955A JP 58134280 A JP58134280 A JP 58134280A JP 13428083 A JP13428083 A JP 13428083A JP S6026955 A JPS6026955 A JP S6026955A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- toner
- magnetic powder
- specific surface
- magnetic toner
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/083—Magnetic toner particles
- G03G9/0838—Size of magnetic components
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は電子写真、静電記録等における静電潜像を現像
するための一成分磁性トナーに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-component magnetic toner for developing electrostatic latent images in electrophotography, electrostatic recording, and the like.
一成分磁性トナーはキャリヤー鉄粉を使用することな（
トナーのみで現像できるので、トナー濃度コントロール
が不要であり、キャリヤーとの混合も行わないのでトナ
ー補給方法も簡単であり、従って現像機も小型化でき、
低コストが計れる等多くの利点をもっていることは周知
のとおりである。しかしながら、従来の磁性トナーはそ
の構成中に４０〜７０％という多量の磁性粉を含有して
いるため、とくに圧力定着において定着不良を生ずると
いう重大な欠点を有するものであった。又、トナーの表
面に低抵抗の磁性粉が多量に露出、又はこれに近い状態
であるため、高湿雰囲気での転写不良や感光体表面を損
なう等多くの問題をかかえるものであった。One-component magnetic toner does not use carrier iron powder (
Since development can be done with toner alone, there is no need to control toner density, and since there is no mixing with carrier, toner replenishment is easy, and the developing machine can also be made smaller.
It is well known that it has many advantages such as low cost. However, since conventional magnetic toners contain a large amount of magnetic powder of 40 to 70% in their composition, they have a serious drawback of causing poor fixing, especially in pressure fixing. Furthermore, since a large amount of low-resistance magnetic powder is exposed on the surface of the toner, or in a state close to this, many problems arise, such as poor transfer in a high-humidity atmosphere and damage to the surface of the photoreceptor.
このような問題を解決する手段として、例えば特開昭５
６ ６４３４９号公報に開示されているような圧力定着
性マイクロカプセルトナーが提案されているか、この場
合、定着性の向上と定着ローラーへのオフセット現象等
の実用特性を同時に満足することができず実用化に至っ
ていない。As a means to solve such problems, for example,
Has a pressure-fixable microcapsule toner as disclosed in Japanese Patent No. 6,64349 been proposed?In this case, it is impossible to simultaneously satisfy practical properties such as improved fixing performance and offset phenomenon to the fixing roller, and it is not practical. It has not yet become a reality.
本発明は上記の事情に鑑みてなされたものであり、磁性
粉と結着剤を主成分とする磁性トナーにおいて、該磁性
粉がｌ １Ｊ１ｎ以上であって、かつＢＥＴ測定法によ
る比表面積が０．５〜３．８Ｊ／ｇであることを特徴と
する磁性トナーを提供するものである。The present invention has been made in view of the above circumstances, and provides a magnetic toner mainly composed of magnetic powder and a binder, in which the magnetic powder has a particle size of 1J1n or more and a specific surface area of 0 as measured by the BET measurement method. The present invention provides a magnetic toner characterized by having a magnetic toner of .5 to 3.8 J/g.
本発明でいう磁性粉はＦｅ３Ｏ４組成のマグネタイト微
粒子、γ−Ｆｅ２ｏ３等強磁性物質が全て対象となり、
その製造工程において、結晶成長方法に特徴をもたせて
合成したｌｕｍ以上の大粒径の磁性粉である。本発明の
特徴とするところは磁性粉の比表面積である。すなわち
、通常、磁性トナーは各複写機の現像システムに適合す
べく最適な磁気特性、電気特性を保持するために４０％
以上の磁性粉を含有している。この場合、従来の磁性ト
ナーはその比表面績が５〜２５ｄ１ｇと大きかったため
トナー表面に磁性粉がむき出しで露出、又はこれに近い
状態にあり、これが定着不良等特性悪化の原因とみなさ
れてきた。本発明ではこの点に鑑み、とくに磁性粉の性
状に着目し、比表面積が０．５〜３．８腎／ｇ、好まし
くは０．８〜２．５ｎ？／ｇであって粒径１１Ｊｍ以上
の磁性粉を適用することにより従来の欠点を解消するこ
とが出来た。具体的には、例えば三井金属鉱業社から上
布されているマグネタイトＭＧ−Ｗ３Ｌが使用しうる。The magnetic powder referred to in the present invention includes all ferromagnetic substances such as magnetite fine particles of Fe3O4 composition and γ-Fe2o3.
It is a magnetic powder with a large particle size of lum or more, which is synthesized by adding characteristics to the crystal growth method in the manufacturing process. The feature of the present invention is the specific surface area of the magnetic powder. In other words, magnetic toner usually has a 40% concentration in order to maintain optimal magnetic and electrical properties to suit the developing system of each copying machine.
Contains the above magnetic powder. In this case, because the conventional magnetic toner had a large specific surface area of 5 to 25 d1g, the magnetic powder was exposed or close to it on the toner surface, and this was considered to be the cause of poor fixation and other deterioration of characteristics. . In view of this point, the present invention pays particular attention to the properties of the magnetic powder, and has a specific surface area of 0.5 to 3.8 kidney/g, preferably 0.8 to 2.5 n? /g and the particle size of 11 Jm or more made it possible to overcome the conventional drawbacks. Specifically, for example, magnetite MG-W3L manufactured by Mitsui Kinzoku Mining Co., Ltd. can be used.
尚、この場合の比表面積の測定は窒素ガス等の吸、脱着
特性を利用したＢＥＴ測定法による。Note that the specific surface area in this case is measured by the BET measurement method that utilizes the adsorption and desorption characteristics of nitrogen gas and the like.
３−
磁性粉の比表面積が０．５Ｊ／ｇ以下であると結着剤樹
脂への分散が不可能でトナー表面の構成が不均一になり
、良好な現像が得られない。又、比表面積か３．Ｌ＃／
ｇ以上であるとトナー表面に露出、又はこれに近い状態
の磁性粉量が多くなり定着方法等問題を生ずる。3- If the specific surface area of the magnetic powder is less than 0.5 J/g, it is impossible to disperse it in the binder resin, and the toner surface structure becomes uneven, making it impossible to obtain good development. Also, the specific surface area or 3. L#/
If it is more than g, the amount of magnetic powder exposed on the toner surface or in a state close to this increases, causing problems in the fixing method, etc.
上記に規定した磁性粉はこのまま結着剤樹脂およびその
他の添加剤と混合し、通常のトナー製造工程、すなわち
溶融混練、粉砕、分級を経て本発明のトナーを作製する
ことができる。The magnetic powder defined above can be mixed as it is with a binder resin and other additives, and the toner of the present invention can be produced through normal toner production processes, that is, melt-kneading, pulverization, and classification.
本発明の磁性ｌ・ナーは、適用する複写機の定着方法に
こだわることなく、使用する結着剤樹脂を適宜選択する
ことにより圧力定着用にも熱定着用にも適用できる。本
発明に使用される結着剤樹脂は、一般にトナー用結着剤
として使用されるものは全て使用可能であるが、例えば
圧力定着の場合、ポリエチレンワックス、マイクロクリ
スタリンワックス等塑性材料が、又熱定着の場合はスチ
レン／アクリル共重合体、スチレン樹脂、エポキシ樹脂
、ポリエステル樹脂等が挙げられる。The magnetic l-ner of the present invention can be applied to both pressure fixing and heat fixing by appropriately selecting the binder resin to be used, without being particular about the fixing method of the copying machine to which it is applied. As the binder resin used in the present invention, any resin commonly used as a binder for toner can be used, but for example, in the case of pressure fixing, plastic materials such as polyethylene wax and microcrystalline wax may be used. In the case of fixing, examples include styrene/acrylic copolymers, styrene resins, epoxy resins, and polyester resins.
４−
又、必要に応じて着色用染願料や電荷制御剤の添加、シ
リカ粉末などの流動調整剤の添加も可能である。4- Furthermore, if necessary, it is also possible to add a coloring dye, a charge control agent, and a flow control agent such as silica powder.
本発明は上記の構成よりなるので、従来の磁性トナーの
欠点であった定着性不良、高湿特性、感光体表面の損傷
等を改良することができた。Since the present invention has the above-described structure, it is possible to improve the problems of conventional magnetic toners, such as poor fixing properties, high humidity characteristics, and damage to the surface of the photoreceptor.
以下、本発明を実施例により説明する。The present invention will be explained below with reference to Examples.
実施例
上記混合物をヘンシェルミキサーにて混合し、次いで２
本ロールミルで溶融混練する。冷却後ハンマークラッシ
ャーにて粗粉し、さらにジェットミルにて微粉砕した後
、風力分級機で分級して１０〜２０ｕｍのトナーを得た
。このトナーに流動調整剤としてシリカ粉末を０．４％
外添し、本発明の磁性トナーを得た。Example The above mixture was mixed in a Henschel mixer, and then 2
Melt and knead using this roll mill. After cooling, it was crushed into coarse powder using a hammer crusher, further finely crushed using a jet mill, and then classified using an air classifier to obtain a toner having a particle size of 10 to 20 um. Add 0.4% silica powder to this toner as a fluidity regulator.
The magnetic toner of the present invention was obtained by external addition.
比較例
上記混合物をヘンシェルミキサーにて混合し、次いで２
本ロールミルで溶融混練する。冷却後ハンマークラッシ
ャーにて粗粉砕し、さらにジェットミルにて微粉砕した
後、風力分級機で分級してｌＯ〜２０ＵＩ１１のトナー
を得た。このトナーに流動調整剤としてシリカ粉末を０
．４％外添し、従来技術による磁性トナーを得た。Comparative Example The above mixture was mixed in a Henschel mixer, and then 2
Melt and knead using this roll mill. After cooling, the powder was coarsely pulverized with a hammer crusher, further finely pulverized with a jet mill, and then classified with an air classifier to obtain a toner having a size of 10 to 20 UI11. Add 0 silica powder to this toner as a fluidity adjuster.
．． A magnetic toner according to the prior art was obtained by adding 4% externally.
上記本発明および従来技術によるトナーを評価するため
に、両トナーを市販の圧力定着用ＰＰＣ電子複写機に適
用し作像して両者の定着性を比較したところ、下表に示
すとおり、本発明のトナーが格段にすぐれた定着性を示
すことを確認した。In order to evaluate the above toners according to the present invention and the prior art, both toners were applied to a commercially available pressure fixing PPC electronic copier to form an image and the fixing properties of the two were compared. It was confirmed that this toner exhibited significantly superior fixing properties.
表
尚、表中の数字は黒ベタパターンの画像濃度（Ａ）に対
する定着試験後の濃度（Ｂ＞の比率、すなわち画像の残
存率Ｂ／ＡＸ Ｉ ＯＯ（％）である。剥離性は２ｃｍ
×１０ｃｍの黒ベタパターン画像に市販のセロハンテー
プを貼り、剥離した後の残存率であり、耐折曲げ性は５
５φの黒へ夕画像を一定圧力で折曲げ、折曲げ部を２０
ｇ／ｃｎｆの荷重で３回こすった後の残存率であり、耐
摩耗性は６φの黒へり画像の上をガーゼでこすった後の
残存率である。The numbers in the table are the ratio of the image density (A) of the black solid pattern to the density after the fixing test (B>, that is, the image survival rate B/AX I OO (%). The peelability is 2 cm
This is the residual rate after applying commercially available cellophane tape to a 10cm x 10cm black solid pattern image and peeling it off.The bending resistance is 5.
Bend the evening image to 5φ black with constant pressure, and bend the bent part by 20mm.
This is the residual rate after rubbing three times under a load of g/cnf, and the abrasion resistance is the residual rate after rubbing the top of a 6φ black edge image with gauze.
７−
一方、画質を評価するため３０°Ｃ８５％ＲＨの雰囲気
で５０００枚の連続コピーをおこなったところ、本発明
のトナーはマクベス反射濃度で常に１．５以上であって
カブリのない安定した画像を得たが、従来トナーは初期
より画像濃度不良で実用に供し得るものではなかった。7- On the other hand, when 5,000 sheets were continuously copied in an atmosphere of 30°C and 85% RH in order to evaluate image quality, the toner of the present invention always had a Macbeth reflection density of 1.5 or higher, resulting in stable images without fogging. However, conventional toners had poor image density from the beginning and could not be put to practical use.
特許出願人 株式会社巴川製紙所 ８−patent applicant Tomoekawa Paper Mill Co., Ltd. 8-
Claims (1)
磁性粉の平均粒径が１１１１１１以上であって、かつＢ
ＥＴ測定法による比表面績が０．５〜３．８ｎ？／ｇで
あることを特徴とする磁性トナー。A magnetic toner containing magnetic powder and a binder as main components, wherein the average particle size of the magnetic powder is 111111 or more, and B
Specific surface performance by ET measurement method is 0.5 to 3.8n? A magnetic toner characterized in that: /g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58134280A JPS6026955A (en) | 1983-07-25 | 1983-07-25 | Magnetic toner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58134280A JPS6026955A (en) | 1983-07-25 | 1983-07-25 | Magnetic toner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6026955A true JPS6026955A (en) | 1985-02-09 |
Family
ID=15124587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58134280A Pending JPS6026955A (en) | 1983-07-25 | 1983-07-25 | Magnetic toner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6026955A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0540341A3 (en) * | 1991-10-30 | 1994-12-07 | Oki Electric Ind Co Ltd | Apparatus for and method of forming image |
| KR20170047181A (en) * | 2015-10-22 | 2017-05-04 | 스피어다인 주식회사 | Tension measuring apparatus and method |
-
1983
- 1983-07-25 JP JP58134280A patent/JPS6026955A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0540341A3 (en) * | 1991-10-30 | 1994-12-07 | Oki Electric Ind Co Ltd | Apparatus for and method of forming image |
| KR20170047181A (en) * | 2015-10-22 | 2017-05-04 | 스피어다인 주식회사 | Tension measuring apparatus and method |
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