JPS60159753A - Carrier for developing electrostatic latent image - Google Patents
Carrier for developing electrostatic latent imageInfo
- Publication number
- JPS60159753A JPS60159753A JP59014334A JP1433484A JPS60159753A JP S60159753 A JPS60159753 A JP S60159753A JP 59014334 A JP59014334 A JP 59014334A JP 1433484 A JP1433484 A JP 1433484A JP S60159753 A JPS60159753 A JP S60159753A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- coating layer
- toner
- developer
- silicone resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- 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
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1139—Inorganic components of coatings
-
- 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
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1132—Macromolecular components of coatings
- G03G9/1135—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- G03G9/1136—Macromolecular components of coatings obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicon atoms
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】 技術分野 この発明は、乾式二成分現像剤用キャリアに関する。[Detailed description of the invention] Technical field The present invention relates to a carrier for a dry two-component developer.
従来技術
従来からキャリア粒子とトナー粒子との混合物からなる
いわゆる二成分系乾式現像剤はよく知られている。この
二成分系乾式現像剤は、比較的大きなキャリア粒子表面
上に微小なトナー粒子が、雨粒子の摩擦により発生した
電気力により保持されており、静電潜像に近接するど、
静電潜像が形成する電界によるトナー粒子に対する潜像
方向への吸引力が、トナー粒子とキャリア粒子間の結合
力に打ち勝って、トナー粒子は静電潜像上に吸引刊着さ
れて静電潜像が可視化されるものである。BACKGROUND OF THE INVENTION So-called two-component dry developers comprising a mixture of carrier particles and toner particles are well known. In this two-component dry developer, minute toner particles are held on the surface of relatively large carrier particles by electric force generated by friction of rain particles, and when they come close to an electrostatic latent image,
The attraction force toward the toner particles in the direction of the latent image due to the electric field formed by the electrostatic latent image overcomes the bonding force between the toner particles and carrier particles, and the toner particles are attracted and deposited on the electrostatic latent image, causing electrostatic The latent image is visualized.
そして、現像剤は現像によって消費されたトナーを補充
しながら反復使用される。The developer is used repeatedly while replenishing the toner consumed by development.
したがって、キャリアは長期間の使用中、常にトナー粒
子を所望する極性で、がっ、充分な帯電量に摩擦帯電し
な【プればならない。Therefore, the carrier must constantly triboelectrically charge the toner particles to a desired polarity and sufficient charge during long-term use.
しかし従来の現像剤は、粒子間の衝突又は粒子と現像機
械との衝突等の機械的衝突、又はこれらの作用による発
熱でキャリア表面にトナー膜が形成され、いわゆるスペ
ント化が生じ、キャリアの帯電特性が使用時間ど共に低
下し、現像剤全体を取換える必要が生じる。However, in conventional developers, a toner film is formed on the carrier surface due to mechanical collisions such as collisions between particles or collisions between particles and the developing machine, or heat generated by these actions, resulting in so-called spent state, which reduces the charge on the carrier. The properties deteriorate with time of use, making it necessary to replace the entire developer.
このようなスペント化を防止するために、従来からキャ
リア表面に種々の樹脂を被覆する方法が提案されている
が、いまだに満足のいくものは得られていない。例えば
スチレン−メタクリレート共重合体、スチレン重合体等
の樹脂で被覆されたキャリアは、帯電特性は優れている
が、表面の臨界表面張力が比較的高く、繰り返し複写す
るうちにや、はりスペント化が起るため現像剤としての
野分があまり長くなかった。これに対して低表面張力を
有するシリコーン樹脂を被覆したキャリアが提案されて
いるが、シリコーン樹脂は１機械的強度が弱いために、
例えば高速複写機のような強い攪拌や、現像部内での長
時間の攪拌により、キャリア粒子が現像部内部壁や感光
体表面に衝突したり、又は粒子同士が衝突すると、シリ
コーン樹脂被覆層が時間とともに摩損、剥離して、摩擦
帯電がトナーとシリコーン樹脂間の帯電から、トナーと
キャリア芯材の帯電に変化するため、現像剤の帯電量が
一定に保てず、画像品質の劣化をきたずｂのであった。In order to prevent such spent formation, methods of coating the carrier surface with various resins have been proposed, but no satisfactory method has been obtained yet. For example, carriers coated with resins such as styrene-methacrylate copolymers and styrene polymers have excellent charging properties, but their surface critical surface tension is relatively high, and after repeated copying, they tend to become spent. Because of this, the field as a developer did not last very long. In response, carriers coated with silicone resin having low surface tension have been proposed, but silicone resin has low mechanical strength.
For example, when carrier particles collide with the inner wall of the developing section or the surface of the photoreceptor, or when particles collide with each other due to strong agitation such as in a high-speed copying machine or long-term agitation within the developing section, the silicone resin coating layer may deteriorate over time. As a result, the frictional charge changes from the charge between the toner and the silicone resin to the charge between the toner and the carrier core material, making it impossible to maintain a constant amount of charge on the developer, resulting in deterioration of image quality. It was b.
目 的
この発明は、以上のような従来技術の欠点を解決するこ
とを目的としており、具体的にはトナーのスペント化に
対するシリコーン樹脂の強い防止作用を損ねることなく
耐摩耗性に優れた被覆層で表面を被覆した静電潜像現像
剤用キャリアを提供することを目的としたものであり、
更に、被覆層を形成する製造条件の変動による現像剤の
帯電量の変動の少ない静電潜像現像剤を提供することで
ある。他の目的は、現像剤の長時間くり返し使用による
現像剤特性の劣化がなく、安定した画像品質を与える静
電潜像現像剤用キャリアを提供することを目的としたも
のである。Purpose This invention aims to solve the above-mentioned drawbacks of the prior art. Specifically, it is an object of the present invention to provide a coating layer with excellent abrasion resistance without impairing the strong preventive effect of silicone resin against spent toner. The purpose is to provide a carrier for an electrostatic latent image developer whose surface is coated with
Furthermore, it is an object of the present invention to provide an electrostatic latent image developer in which the charge amount of the developer is less likely to vary due to variations in manufacturing conditions for forming a coating layer. Another object of the present invention is to provide a carrier for an electrostatic latent image developer that does not cause deterioration of developer characteristics due to repeated use of the developer over a long period of time and provides stable image quality.
１−一に
この発明の構成は、カーボン粉末を含有するシリコーン
樹脂で表面が被覆されている静電潜像現像剤用キャリア
である。1-1 The structure of the present invention is a carrier for an electrostatic latent image developer whose surface is coated with a silicone resin containing carbon powder.
この発明で用いられるシリコーン樹脂としては、従来知
られているどのようなシリコーン樹脂であってもよく、
例えば市販品として入手できる信越化学製のＫＲ２７Ｎ
、ＫＲ２５５、ＫＲ１５２や東しシリコーン製Ｓ Ｒ２
４００，Ｓ Ｈ８４０、Ｓ Ｒ２４０６等が用いられる
。The silicone resin used in this invention may be any conventionally known silicone resin.
For example, Shin-Etsu Chemical's KR27N, which is available as a commercial product.
, KR255, KR152 and Toshi Silicone S R2
400, SH840, SR2406, etc. are used.
この発明のキャリアの核粒子どしては、平均粒径が１０
〜１０００μ好ましくは３０〜５００μの砂、コバルト
、鉄、銅、ニッケル、亜鉛、アルミニウム、黄銅、ガラ
ス等の非金属や単一金属または合金等従来使用きれてい
る月利が広く用いられる。The core particles of the carrier of this invention have an average particle size of 10
-1000μ, preferably 30-500μ of sand, non-metals such as cobalt, iron, copper, nickel, zinc, aluminum, brass, glass, single metals, alloys, etc., which are conventionally used, are widely used.
シリコーン樹脂層の形成法どしては、被覆層組成物を上
記核体粒子表面に噴霧法等の従来公知の手段で塗布すれ
ばよい。The silicone resin layer may be formed by applying the coating layer composition to the surface of the core particles by a conventionally known method such as a spraying method.
ところでシリコーン樹脂がカーボン粉末を含有していな
いときは、被覆層が形成される時の温度、すなわち成膜
温度が５℃増減すると製品である現像剤の帯電量が５μ
Ｃ１０増減し、性質が安定した製品を製造することがむ
ずかしかったが、シリコーン樹脂にカーボン粉末を添加
して用いたときは、現像剤の帯電量はほとんど増減する
ことなく、安定した製品が得られる。この被覆層組成物
は、シリコーン樹脂溶液中にカーボン微細粒子を添加し
て適宜のミキサーで分散して調製される。。By the way, when the silicone resin does not contain carbon powder, if the temperature at which the coating layer is formed, that is, the film-forming temperature, increases or decreases by 5 degrees Celsius, the amount of charge of the developer, which is the product, will decrease by 5 μ.
It was difficult to produce a product with stable properties due to the increase or decrease in C10, but when carbon powder is added to silicone resin and used, the charge amount of the developer hardly changes and a stable product can be obtained. . This coating layer composition is prepared by adding fine carbon particles to a silicone resin solution and dispersing the mixture using an appropriate mixer. .
被覆層中に分散されるカーボン微細粒子は、従来公知の
カーボン粉末でよ（、平均粒径が５〜３００ｍμの微細
粒子が好ましく、シリコーン樹脂１００重量部に対して
２”−５０重量部添加するのが゛よく、特に５〜２０重
量部が適当である。The carbon fine particles dispersed in the coating layer may be conventionally known carbon powder (fine particles with an average particle size of 5 to 300 mμ are preferable, and are added in an amount of 2" to 50 parts by weight per 100 parts by weight of silicone resin. 5 to 20 parts by weight is particularly suitable.
この発明のキャリアとともに用いられるトナーとしては
、従来公知の方法で製造されたものが用いられ、具体的
には樹脂成分、通常可視像の形成に必要なカーボンブラ
ック等の着色剤をよく混合し、熱ロールミルで混練した
後、冷却、固化後粉砕、分級して得られる。The toner used with the carrier of this invention is one manufactured by a conventionally known method, and specifically, a resin component and a coloring agent such as carbon black, which is usually necessary for forming a visible image, are thoroughly mixed. It is obtained by kneading in a heated roll mill, cooling, solidifying, pulverizing and classifying.
キャリアならびにトナーの使用量としては、トナー粒子
がキャリア粒子のシリコーン樹脂表面に付着してその表
面積の３０〜９０％占める程度に両粒子を混合するのが
好ましい。Regarding the amount of carrier and toner used, it is preferable that the toner particles be mixed to such an extent that the toner particles adhere to the silicone resin surface of the carrier particles and occupy 30 to 90% of the surface area.
以下、実施例によって、この発明を具体的に説明する。Hereinafter, the present invention will be specifically explained with reference to Examples.
実施例１
シリコーン樹脂（信越化学株式会社製
ＫＲ２５０）・・・１５００重量部
カーボンカーボン（Ｃｏｌｏｕｒ Ｂｌａｃｋ 、’
Ｆ Ｗ ２： ＤＥＧＵＳＳＡ製）・・・１０重量部ト
ルエン・・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・１！１００！ｌ量部上記混合物
をホモミキサーで３０分間分散して被覆層形成液を調製
した。この被覆層形成液を１００μの球状酸化鉄粉５０
００重量部の表面に流動床型塗布装置を用いて施し、被
覆層を形成してキャリアをつくった。この被覆層の平均
厚さは１．′５μで゛あった。このキャリアをキャリア
Ａとする。Example 1 Silicone resin (KR250 manufactured by Shin-Etsu Chemical Co., Ltd.)...1500 parts by weight Carbon carbon (Colour Black, '
FW 2: DEGUSSA)...10 parts by weight toluene...
・・・・・・・・・・・・1!100! A coating layer forming liquid was prepared by dispersing 1 part of the above mixture in a homomixer for 30 minutes. This coating layer forming solution was mixed with 50 μm of 100μ spherical iron oxide powder.
A carrier was prepared by applying the coating layer to the surface of 00 parts by weight using a fluidized bed coating device to form a coating layer. The average thickness of this coating layer is 1. It was 5μ. This carrier is called carrier A.
次に、上記組成と同じ被覆層を環境温度１８０℃で形成
したキャリアをつ（す、これをキャリアＢとした。この
キレリアＢの被覆層の平均厚さは１．４μであった。Next, a carrier was prepared in which a coating layer having the same composition as above was formed at an ambient temperature of 180° C. This was designated as carrier B. The average thickness of the coating layer of this Kirelia B was 1.4 μm.
一方、トナーとして
スチレンとｎ−ブチルメタクリレート
との共重合体・・・８７重量部
カーボンブラック・・・・・・・・・・・・・・・・・
・・・・・・・１０重量部モノアゾ染料の２：１型りＩ
］ ｌｘ錯塩染料° ・・・・・・・・・・・・・・・
・・・・・・・・・３重量部からなる平均粒径６μのト
ナーを調製した。On the other hand, as a toner, a copolymer of styrene and n-butyl methacrylate...87 parts by weight carbon black...
・・・・・・2:1 molding I of 10 parts by weight monoazo dye
] lx complex salt dye ° ・・・・・・・・・・・・・・・
A toner containing 3 parts by weight and an average particle size of 6 μm was prepared.
キャリアＡおよびキャリアＢそれぞれ１００重量部と上
記１〜ナー２．５重量部とを混合して、各々現像剤Ａ、
現像剤Ｂとした。By mixing 100 parts by weight of each of carrier A and carrier B with 2.5 parts by weight of the above-mentioned toners 1 to 2.5 parts by weight, developer A and carrier B, respectively, were mixed.
It was designated as developer B.
これらの現像剤を用いてセレン感光体上の潜像を１分間
３０回の速さで現像し、転写づる工程を、１〜ナーを補
給しながら１０万回繰り返した。その時のコピー画質は
、現像剤Ａ１現像剤Ｂとちにほとんど変化がなかった。Using these developers, the latent image on the selenium photoreceptor was developed at a rate of 30 times per minute, and the transfer process was repeated 100,000 times while replenishing the toner. At that time, there was almost no change in copy image quality between developer A and developer B.
現像剤製造時の０７Ｍは現像剤Ａが１８．１μＣ／ｇで
あり、現像剤Ｂは１８．６μＣ／ｇでほとんど差はなか
った。In 07M when the developer was manufactured, the developer A was 18.1 μC/g, and the developer B was 18.6 μC/g, so there was almost no difference.
また現像剤中のキャリアを分別し、被覆層の平均厚さを
測定したところ、キャリア△、キャリアＢはイれぞれ１
．３μ、１．２μであり、摩耗していなかった。In addition, when the carrier in the developer was separated and the average thickness of the coating layer was measured, carrier △ and carrier B were each 1
．． They were 3μ and 1.2μ, and were not worn.
比較例１
実施例１における被覆層形成液の成分からカーボンを除
いた外は実施例１と同様にし、被覆層を形成づる環境温
度が１１０℃であるキャリアをキャリアＣとし、この温
度が１８０℃であるキャリアをキャリアＤとした。これ
らのキャリアの被覆層の平均厚さはキャリアＣが１．４
μ、キャリアＤが１．３μであった。Comparative Example 1 The procedure was the same as in Example 1 except that carbon was removed from the components of the coating layer forming liquid in Example 1, and the carrier in which the environmental temperature for forming the coating layer was 110°C was designated as Carrier C, and this temperature was 180°C. This carrier was designated as carrier D. The average thickness of the coating layer of these carriers is 1.4 for carrier C.
μ and carrier D were 1.3 μ.
これらのキャリアについて、実施例１と同様のテストを
したところ、１０万回後のコピー画質は低下しており、
また現像剤作成時の０７Ｍは現像剤Ｃが１８．４μｃ／
ｉｌ現像剤りが２７．１μＣ１０と相違がみられ、現１
象能力にも差が認められた。また、現像剤中のキャリア
を分別し、被覆層の平均厚さを調べたところ、キャリア
Ｃ、キャリアＤはそれぞれ０，８μ、０．９μに摩耗し
ていた。When these carriers were tested in the same manner as in Example 1, it was found that the copy image quality deteriorated after 100,000 copies.
Also, when creating developer 07M, developer C was 18.4μc/
There is a difference in the IL developer value of 27.1 μC10, and the current 1
Differences were also observed in visual ability. Further, when the carrier in the developer was separated and the average thickness of the coating layer was examined, it was found that carrier C and carrier D were worn to 0.8 μm and 0.9 μm, respectively.
実施例２
シリコーン樹脂（トーμ・シリコーン
Ｓ Ｒ２４００＠トーレ製）・・・１５００重量部カー
ボン（ＰｒｉｎｔｅＸＶ ： ＤＥＧＵＳＳＡ製）・・
・１０重量部
トルエン・・・・・・・・・・・・・・・・・・・・・
・・・・・・・・・・・・ｉｓｏｏｍ ｍ部上記組成の
混合物をホモミキサーで３０分間分散して被覆層形成液
を調製した。これを１００μの球状酸化鉄粉５０００重
量部の表面に流動床型塗布装置装置を用いて施し、被覆
層を形成しキャリアをつくった。Example 2 Silicone resin (Toμ Silicone S R2400 @ manufactured by Toray)...1500 parts by weight carbon (PrinteXV: manufactured by DEGUSSA)...
・10 parts by weight toluene・・・・・・・・・・・・・・・・・・
. . . m parts of isoom The mixture having the above composition was dispersed for 30 minutes using a homomixer to prepare a coating layer forming liquid. This was applied to the surface of 5,000 parts by weight of 100 μm spherical iron oxide powder using a fluidized bed coating device to form a coating layer and a carrier.
被覆層を形成するときの温度が１１０℃のキャリアをキ
ャリアＥ１１８０℃のキャリアをキレリアＦとする。こ
のときのキ藍・リア被覆層の平均厚さはキャリアＥが１
．４μ、キャリアＦが１．４μであった。A carrier whose temperature is 110° C. when forming the coating layer is carrier E, and a carrier whose temperature is 1180° C. is Kyrelia F. At this time, the average thickness of the indigo/rear coating layer is 1 for carrier E.
．． 4μ, and carrier F was 1.4μ.
これらのキャリアに実施例１と同様の試験をしたところ
、１０万回後のコピー画質は、現像剤Ｅ１現像剤Ｆとも
にほとんど変化しなかった。また、現像剤作成時の０７
Ｍは現像剤Ｅが１７．６μＣ／ｇ、現像剤Ｆが１７．７
μＣ／ｇであってほとんど差異がなかった。また現像剤
中のキュリアを分別し、被覆層の平均厚さを測定したと
ころ、キャリアビ１キヤリアＦはどちらも１．２μであ
り、はとんど摩耗はしていないといえる。When these carriers were subjected to the same test as in Example 1, the image quality after 100,000 copies was almost unchanged for both developers E and F. Also, 07 at the time of developer creation.
M is 17.6 μC/g for developer E and 17.7 for developer F.
μC/g, and there was almost no difference. Further, when the curia in the developer was separated and the average thickness of the coating layer was measured, the average thickness of the coating layer was 1.2μ for both Carrier Bi and Carrier F, and it can be said that there was almost no wear.
効 果
以上説明したように、この発明のキャリアはシリコーン
樹脂がもっている、トナーのスペント化を防止する作用
を損ねることなく耐摩耗性の優れた被覆層を有し、これ
を用いれば現像剤の長時間くり返し使用による性質の劣
化がなく、安定した画質が得られる。更にその製造に際
し、製造条件の変動に影響されず帯電量が安定した製品
が製造できる。Effects As explained above, the carrier of the present invention has a coating layer with excellent abrasion resistance without impairing the effect of silicone resin to prevent toner from becoming spent. There is no deterioration in properties due to repeated use over a long period of time, and stable image quality can be obtained. Furthermore, during production, a product with a stable charge amount can be produced without being affected by fluctuations in production conditions.
特許出願人 株式会社リ コ − 代理人 弁理士 小 松 秀 岳 代理人 弁理士 旭 宏 手続ネ巾正書（自発） 昭和５９年３月１２日 特許庁長官 若 杉 和 夫 殿 １、事件の表示 昭和５９年特許願第１４３３４号。Patent applicant Rico Co., Ltd. Agent Patent Attorney Hidetake Komatsu Agent Patent Attorney Hiroshi Asahi Procedural booklet (voluntary) March 12, 1980 Mr. Kazuo Wakasugi, Commissioner of the Patent Office 1. Indication of the case: Patent Application No. 14334 of 1982.
２、発明の名称 静電潜像現像用キャリア３、補正をす
る者
事件との関係 特許出願人
名 称 （６７４）株式会社 リコー
５、補正命令の日付 （自 発）
６、補正の対象 明細書中、発明の詳細な説明の欄。2. Title of the invention Carrier for electrostatic latent image development 3. Relationship with the person making the amendment Name of patent applicant (674) Ricoh Co., Ltd. 5. Date of amendment order (voluntary) 6. Subject of amendment In the specification , a column for detailed description of the invention.
７、補正の内容
（１）明細書第５頁第１３行の「製品である」を削除す
る。7. Contents of the amendment (1) Delete "It is a product" from page 5, line 13 of the specification.
（２）同第１４行および第１８行の１製品」を「現像剤
」と訂正する。(2) "One product" in lines 14 and 18 of the same document is corrected to "developer."
（３）第６頁第１行と第２行との間に下記文を挿入する
。(3) Insert the following sentence between the first and second lines of page 6.
「チャンネルブラック（例えば、デグサ社のＦＷ２、Ｐ
ｒｉｎｔｅｘＵ 、 Ｐ ｒｉｎｔｅｘ １４０ＬＪ
、アシュラントケミカル社のＵｎｉｔｅｄ Ｒ、ＬＪ
ｎ１ｔｅｄ Ｂ Ｂなど）、ファーネスカーボン（例
えば、キャボット社のＲｅｇａｌ ３００Ｒ、Ｓ ｔｅ
ｒｌｉｎｇ ９９、デグサ社のｐｒｉｎｔｅｘ ４００
、（：、 ｏｌａｘＬ、 ｐ ｒｉｎｔｅｘＧ 、アシ
ュランドケミカル社のＵ ｎ１ｔＱｄ ３００１、ｔＪ
ｎ１ｔｅｄＸＣ−３０１６など）、ランプブラック（
デグサ社のＬ ａｎ＋ｐ Ｂ １ａｃｋ １０１など）
の」（４）第７頁第１０行の「形成して」の前に「環境
温度１７０℃で」を挿入する。"Channel black (for example, Degussa's FW2, P
rintexU, Printex 140LJ
, United R, LJ of Assurant Chemical Company
n1ted B B, etc.), furnace carbon (e.g., Cabot Regal 300R, S te
rling 99, Degussa Printex 400
, (:, olaxL, printexG, Ashland Chemical Company's U n1tQd 3001, tJ
n1tedXC-3016, etc.), lamp black (
Degussa's L an+p B 1ack 101, etc.)
(4) Insert "at an environmental temperature of 170°C" before "formed" on page 7, line 10.
Claims (1)
れている静電潜像現像剤用キャリア。A carrier for electrostatic latent image developers whose surface is coated with silicone resin containing carbon powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59014334A JPS60159753A (en) | 1984-01-31 | 1984-01-31 | Carrier for developing electrostatic latent image |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59014334A JPS60159753A (en) | 1984-01-31 | 1984-01-31 | Carrier for developing electrostatic latent image |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60159753A true JPS60159753A (en) | 1985-08-21 |
Family
ID=11858165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59014334A Pending JPS60159753A (en) | 1984-01-31 | 1984-01-31 | Carrier for developing electrostatic latent image |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60159753A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62182759A (en) * | 1986-02-06 | 1987-08-11 | Ricoh Co Ltd | Carrier for electrostatic latent image development |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54155048A (en) * | 1978-05-29 | 1979-12-06 | Ricoh Co Ltd | Carrier material for electrophotographic development |
| JPS5675659A (en) * | 1979-11-27 | 1981-06-22 | Canon Inc | Carrier material |
| JPS56126843A (en) * | 1980-03-10 | 1981-10-05 | Tomoegawa Paper Co Ltd | Carrier for electrophotographic dry toner |
-
1984
- 1984-01-31 JP JP59014334A patent/JPS60159753A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54155048A (en) * | 1978-05-29 | 1979-12-06 | Ricoh Co Ltd | Carrier material for electrophotographic development |
| JPS5675659A (en) * | 1979-11-27 | 1981-06-22 | Canon Inc | Carrier material |
| JPS56126843A (en) * | 1980-03-10 | 1981-10-05 | Tomoegawa Paper Co Ltd | Carrier for electrophotographic dry toner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62182759A (en) * | 1986-02-06 | 1987-08-11 | Ricoh Co Ltd | Carrier for electrostatic latent image development |
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