JPH02219063A - Dry processing two-component developer for electrophotography - Google Patents
Dry processing two-component developer for electrophotographyInfo
- Publication number
- JPH02219063A JPH02219063A JP1039337A JP3933789A JPH02219063A JP H02219063 A JPH02219063 A JP H02219063A JP 1039337 A JP1039337 A JP 1039337A JP 3933789 A JP3933789 A JP 3933789A JP H02219063 A JPH02219063 A JP H02219063A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- carbon black
- sticking
- toner particles
- developer
- 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.)
- Granted
Links
- 239000006229 carbon black Substances 0.000 claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 20
- 241000872198 Serjania polyphylla Species 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011162 core material Substances 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 235000019241 carbon black Nutrition 0.000 description 19
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 239000000969 carrier Substances 0.000 description 6
- -1 Ca and Ba Chemical class 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 239000000975 dye Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- NJVOHKFLBKQLIZ-UHFFFAOYSA-N (2-ethenylphenyl) prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1C=C NJVOHKFLBKQLIZ-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 241001600434 Plectroglyphidodon lacrymatus Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 241000907663 Siproeta stelenes Species 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 1
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 235000012752 quinoline yellow Nutrition 0.000 description 1
- IZMJMCDDWKSTTK-UHFFFAOYSA-N quinoline yellow Chemical compound C1=CC=CC2=NC(C3C(C4=CC=CC=C4C3=O)=O)=CC=C21 IZMJMCDDWKSTTK-UHFFFAOYSA-N 0.000 description 1
- 229940051201 quinoline yellow Drugs 0.000 description 1
- 239000004172 quinoline yellow Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- XOSXWYQMOYSSKB-LDKJGXKFSA-L water blue Chemical compound CC1=CC(/C(\C(C=C2)=CC=C2NC(C=C2)=CC=C2S([O-])(=O)=O)=C(\C=C2)/C=C/C\2=N\C(C=C2)=CC=C2S([O-])(=O)=O)=CC(S(O)(=O)=O)=C1N.[Na+].[Na+] XOSXWYQMOYSSKB-LDKJGXKFSA-L 0.000 description 1
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野］
本発明は静電荷像の現像に使用される粉体現像剤、より
具体的には電子複写機で使用される電子写真用乾式二成
分現像剤に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a powder developer used for developing electrostatic images, and more specifically to a dry two-component developer for electrophotography used in an electronic copying machine. Regarding drugs.
電子写真法において感光体上に形成された静電荷像は現
像剤により現像された後、転写紙上に転写、定着される
。この現像剤としては、トナーとキャリアとよりなる電
子写真用乾式二成分現像剤（以下現像剤と称す）が知ら
れている。In electrophotography, an electrostatic image formed on a photoreceptor is developed with a developer, and then transferred and fixed onto a transfer paper. As this developer, a dry two-component developer for electrophotography (hereinafter referred to as developer) consisting of toner and carrier is known.
近年、高画質、長寿命化のため現像剤のキャリアとして
固有抵抗が１０１０Ω・ｃｍ以上の高抵抗キャリアが用
いられている。しかしながら、この高抵抗キャリアを用
いた現像剤を複写機に使用すると、現像スリーブの表面
へのトナー付着による地力ブリの発生という問題があっ
た。In recent years, high-resistance carriers with a specific resistance of 1010 Ω·cm or more have been used as developer carriers for high image quality and long life. However, when a developer using this high-resistance carrier is used in a copying machine, there is a problem in that the toner adheres to the surface of the developing sleeve, causing blurring.
従来、上記問題を解決するため、トナーに含有させるカ
ーボンブラックの量を増加させるか又は結着樹脂へのカ
ーボンブラックの分散性を低下させることによりトナー
の固有抵抗を下げ、該トナーと高抵抗キャリアとからな
る現像剤の固有抵抗を下げることにより、現像スリーブ
の表面へのトナー付着を防止してきた。しかし、この方
法ではトナーの絶縁性の低下により帯電量が経時ととも
に減衰し、現像剤が長期の多数枚複写に耐え得ないとい
う問題があった。Conventionally, in order to solve the above problems, the specific resistance of the toner was lowered by increasing the amount of carbon black contained in the toner or reducing the dispersibility of carbon black in the binder resin, and the toner and the high-resistance carrier were reduced. Toner adhesion to the surface of the developing sleeve has been prevented by lowering the specific resistance of the developer. However, this method has the problem that the amount of charge decreases over time due to a decrease in the insulation properties of the toner, and the developer cannot withstand long-term copying of a large number of sheets.
本発明は上記の問題に鑑みてなされたものであリ、高画
質と長寿命の特性を維持しかつ地力ブリのない新規な電
子写真用乾式二成分現像剤を提供することにある。The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a new dry two-component developer for electrophotography that maintains the characteristics of high image quality and long life and is free from blurring.
本発明者は前記問題を解決すべく種々研究した結果、ト
ナー粒子表面にｐＨ２，５〜６のカーボンブラックを付
着させることにより前記問題が著しく改善されることを
見出し本発明に至った。As a result of various studies aimed at solving the above-mentioned problems, the inventors of the present invention have found that the above-mentioned problems can be significantly improved by attaching carbon black having a pH of 2.5 to 6 to the surface of toner particles, leading to the present invention.
すなわち本発明はトナー粒子表面にｐＨ２，５〜６のカ
ーボンブラックをトナー重量に対して０．１〜１％付着
させたトナーとキャリアとからなることを特徴とする電
子写真用乾式二成分現像剤である。That is, the present invention provides a dry two-component developer for electrophotography, characterized in that it consists of a toner and a carrier to which carbon black having a pH of 2.5 to 6 is adhered to the surface of the toner particles in an amount of 0.1 to 1% based on the weight of the toner. It is.
トナー粒子表面に付着させるカーボンブラックの製造方
法は、例えばファーネス法及び衝撃法等通常の方法によ
りｐＨが２．５〜６の範囲内に入るものであればとくに
制限されるものではない。The method for producing carbon black to be adhered to the surface of toner particles is not particularly limited as long as the pH falls within the range of 2.5 to 6 by a conventional method such as a furnace method or an impact method.
また、カーボンブラックのｐＨが２．５〜６であれば、
他の物性′は特に制限するものではないが、現像剤の長
寿命化のため粒子径が３０ｍμ以下、比表面積が１００
〜３００ｒｒｆ／ｇ、吸油量が８０〜ｂ
しい。上記カーボンブラックの市販品としては以下のも
のが挙げられる。Moreover, if the pH of carbon black is 2.5 to 6,
Other physical properties' are not particularly limited, but in order to extend the life of the developer, the particle diameter is 30 mμ or less, and the specific surface area is 100 mμ or less.
~300rrf/g, oil absorption is 80~b. Commercially available carbon blacks include the following.
例えば、三菱化成社製ＭＡ−１００，＃９００゜＃１０
００． ＃２２００Ｂ ：米国キャボット社製ＭＯＮＡ
ＲＣＨ１３００、ＭＯＮＡＲＣＨ１０００，ＭＯＧｔｌ
Ｌ、Ｌ、ＲＥＧＡＬ、４００Ｒ：コロンビア・カーボン
社製ＲＡＶＥＮ１２５５． ＲＡＶＥＮ８９０． Ｃ０
ＮＤＵＣＴｔ！Ｘ４０−２２０等が挙げられ、上記カー
ボンブラックは単独で又は二種以上を混合して使用する
ことができる。For example, MA-100 manufactured by Mitsubishi Kasei, #900° #10
00. #2200B: MONA manufactured by Cabot, USA
RCH1300, MONARCH1000, MOGtl
L, L, REGAL, 400R: RAVEN1255 manufactured by Columbia Carbon. RAVEN890. C0
NDUCTt! X40-220 and the like, and the above carbon blacks can be used alone or in combination of two or more.
本発明では、トナー粒子表面に付着されるという意味は
次のように定義される。すなわち、まぷしといわれる弱
い状態で、トナー粒子表面にカーボンブラックが付着し
ていても良いし、また、トナー粒子表面にカーボンブラ
ック粒子の一部が埋没か又は熱融着等により強固に付着
した状態、いわゆる固着という状態で付着していても良
い。In the present invention, the meaning of "attached to the surface of toner particles" is defined as follows. In other words, carbon black may be attached to the surface of the toner particles in a weak state called mapshi, or carbon black particles may be partially embedded or firmly attached to the surface of the toner particles due to thermal fusion, etc. It may be attached in a so-called fixed state.
トナー粒子表面にまぶしの状態でカーボンブラックを付
着させる手段としては、Ｖ型混合機、タービン型撹拌機
、ヘンシェルミキサー等の一般的な混合機を用いる方法
が適用され、一方、固着の状態でカーボンをトナー表面
に付着する手段としては、機械的衝撃力により芯材の表
面に微粉体を固着させるための粉体の表面改質装置とし
て知られる奈良機械製作所製の“ナラハイブリダイゼー
ションシステム”やホソカヮミクロン社製の“オングミ
ル”°等が適用できる。A method using a general mixer such as a V-type mixer, a turbine-type stirrer, or a Henschel mixer is used as a means of attaching carbon black in a dusty state to the surface of toner particles. As a means of attaching the powder to the toner surface, the "Nara Hybridization System" manufactured by Nara Kikai Seisakusho, which is known as a powder surface modification device for fixing fine powder to the surface of the core material by mechanical impact force, and the Hoso Kawa Micron ``Ong Mill'' manufactured by Kogyo Co., Ltd. can be used.
トナー粒子表面に付着させるカーボンブラックの量は、
トナー重量に対してＯ，１〜１％が適量である。カーボ
ンブラックの量が０．１％未満だと効果が少なく現像ス
リーブの表面へのトナー付着が発生する。一方、１％を
越えるとトナーの固有抵抗が低下するため所望の帯電量
が得られなくなる。The amount of carbon black attached to the surface of toner particles is
A suitable amount of O is 1 to 1% based on the weight of the toner. If the amount of carbon black is less than 0.1%, the effect will be small and toner will adhere to the surface of the developing sleeve. On the other hand, if it exceeds 1%, the specific resistance of the toner decreases, making it impossible to obtain the desired amount of charge.
本発明ではｐ！１２．５〜６のカーボンブラックの他に
流動性向上のためシリカ微粉末等をトナー粒子表面に付
着させてもよい。In the present invention, p! In addition to the carbon black of 12.5 to 6, fine silica powder or the like may be attached to the surface of the toner particles to improve fluidity.
本発明の現像剤を構成するトナーは、結着樹脂、電荷制
御剤、着色剤及び必要に応じてその他の添加物を混合し
、溶融混練した後、冷却、固化後粉砕分級して得られる
。The toner constituting the developer of the present invention is obtained by mixing a binder resin, a charge control agent, a colorant, and other additives as necessary, melting and kneading the mixture, cooling it, solidifying it, and then crushing and classifying the mixture.
以下に本発明のトナーに使用される材料について詳述す
る。まず結着樹脂としては、一般にトナー用結着剤とし
て使用されているものが使用可能である５例えば、スチ
レン樹脂、ポリアクリル酸エステル樹脂、スチレン−ア
クリル酸エステル共重合体樹脂、ポリ塩化ビニル樹脂、
ポリ酢酸ビニル樹脂、ポリ塩化ビニルデン樹脂、フェノ
ール樹脂、エポキシ樹脂、ポリエステル樹脂などが挙げ
られる。また、これらの樹脂はその目的に応じて、１種
類とは限らず２種類以上の混合物として用いることが出
来る。The materials used in the toner of the present invention will be described in detail below. First, as the binder resin, those commonly used as binders for toners can be used.5For example, styrene resin, polyacrylate resin, styrene-acrylate copolymer resin, polyvinyl chloride resin. ,
Examples include polyvinyl acetate resin, polyvinyldene chloride resin, phenol resin, epoxy resin, and polyester resin. Furthermore, depending on the purpose, these resins are not limited to one type, but can be used as a mixture of two or more types.
電荷制御剤としては、ニグロシン系染料、四級アンモニ
ウム塩、含金属錯塩染料、Ｃａ、 Ｂａなどのチタネー
トあるいはカーボネート、アルコキシル化アミン、ナイ
ロン等各種ポリアミド系樹脂、アミノ基を含有する縮合
系ポリマー等のポリアミン樹脂等が所望するトナーの帯
電極性に応じて適宜選択して用いられる。Examples of charge control agents include nigrosine dyes, quaternary ammonium salts, metal-containing complex dyes, titanates or carbonates such as Ca and Ba, alkoxylated amines, various polyamide resins such as nylon, and condensation polymers containing amino groups. A polyamine resin or the like is appropriately selected and used depending on the desired charging polarity of the toner.
着色剤としては、任意の適当な顔料又は染料を用いるこ
とが出来る。例えばカーボンブラック、ニグロシン染料
、アニリンブルー、アルコイルブルー、クロムイエロー
、ウルトラマリンブルーデュポンオイルレッド、キノリ
ンイエロー、メチレンブルー、フタロシアニンブルー、
マラカイトブルー、銅またはクロム等遷移金属を含む染
料等が挙げられる。Any suitable pigment or dye can be used as the colorant. For example, carbon black, nigrosine dye, aniline blue, alcoyl blue, chrome yellow, ultramarine blue DuPont oil red, quinoline yellow, methylene blue, phthalocyanine blue,
Examples include malachite blue, dyes containing transition metals such as copper or chromium, and the like.
また、必要に応じてトナーに配合されるその他の添加物
としては、潤滑剤、研摩剤、定着剤などの例えばポリテ
トラフルオロエチレン粉、高級脂肪酸の金属塩、酸化セ
リウム、低分子量ポリエチレン、低分子量ポリプロピレ
ン等が挙げられる。Other additives that may be added to the toner as needed include lubricants, abrasives, fixing agents, etc., such as polytetrafluoroethylene powder, metal salts of higher fatty acids, cerium oxide, low molecular weight polyethylene, and low molecular weight Examples include polypropylene.
本発明の現像剤を構成するトナーは、鮮明な画像及び十
分な帯電量を維持するため固有抵抗を５×１０１０Ω・
ｃｍ以上とすることが好ましい。The toner constituting the developer of the present invention has a specific resistance of 5 x 1010 Ω in order to maintain a clear image and a sufficient amount of charge.
It is preferable to set it to cm or more.
一方、本発明の現像剤を構成するキャリアは、固有抵抗
が１０１０Ω・ｃｍ以上が好ましく、一般にトナー用キ
ャリアとして使用されるものが使用可能である。キャリ
アの固有抵抗は次の様にして測定する。まず、キャリア
を温度２２〜２５℃、湿度５０〜５４％の環境状態に１
５分間放置し、その後キャリアをセルに充てんし、２５
０Ｖの直流電圧を印加して固有抵抗を求める。具体的に
キャリアは鉄粉系キャリア、フェライト系キャリアがい
ずれも使用でき、ポリエステル系樹脂、フッ素系樹脂、
アクリル系樹脂、シリコン系樹脂等をキャリア表面に被
覆した樹脂コートキャリアとか磁性粉を結着樹脂に混練
して造粒したいわゆる磁性樹脂キャリアも使用可能であ
る。On the other hand, the carrier constituting the developer of the present invention preferably has a specific resistance of 1010 Ω·cm or more, and carriers commonly used as toner carriers can be used. The specific resistance of the carrier is measured as follows. First, the carrier is placed in an environment with a temperature of 22 to 25°C and a humidity of 50 to 54%.
Leave it for 5 minutes, then fill the cell with carrier and incubate for 25 minutes.
A DC voltage of 0V is applied to determine the specific resistance. Specifically, both iron powder-based carriers and ferrite-based carriers can be used, as well as polyester resins, fluorine-based resins,
It is also possible to use a resin coated carrier whose surface is coated with acrylic resin, silicone resin, etc., or a so-called magnetic resin carrier obtained by kneading magnetic powder into a binder resin and granulating it.
次に本発明を実施例により具体的に説明する。 Next, the present invention will be specifically explained using examples.
なお、本発明はその要旨をこえない限り以下の実施例に
限定されるものではない。It should be noted that the present invention is not limited to the following examples unless it exceeds the gist thereof.
〈実施例１〜３．比較例１〜４〉
下記の配合の材料を混合して溶融混練後、粉砕分級して
平均粒子径が１１．５μｍのトナーを得た。<Examples 1 to 3. Comparative Examples 1 to 4> Materials having the following formulations were mixed, melted and kneaded, and then pulverized and classified to obtain a toner having an average particle diameter of 11.5 μm.
次に第１表に示すようなカーボンブラックをヘンシェル
ミキサーを使用して上記トナーと混合し、カーボンブラ
ックをトナー粒子表面に付着せしめた。但し、比較例１
はカーボンブラックを付着しなかった。Next, carbon black as shown in Table 1 was mixed with the above toner using a Henschel mixer to cause the carbon black to adhere to the surface of the toner particles. However, comparative example 1
did not adhere carbon black.
ｒ以下余白」
次に上記第１表より得られた各々のトナー３．５重量部
に対して、シリコン系樹脂で被覆された固有抵抗が１０
１！Ω・ａｍのフェライトキャリア（Ｆ９．５−１００
、日本鉄粉社製）１００重量部とを混合して現像剤を作
製した。"margin below r" Next, for 3.5 parts by weight of each toner obtained from Table 1 above, the specific resistance coated with silicone resin is 10
1! Ω・am ferrite carrier (F9.5-100
, manufactured by Nippon Tetsuko Co., Ltd.) to prepare a developer.
上記実施例１〜３にもとづく本発明の現像剤および比較
例１〜４にもとづく比較用の現像剤を電子複写機（リコ
ー社製ＦＴ６０８０）にて１０万枚まで多数枚複写を行
い、帯電量及び地力ブリの評価を行なった。その結果を
第２表に示す。ここで、帯電量はブローオフ法により測
定し、地力ブリは非画像部をマクベス反射濃度計で測定
した。A large number of copies of up to 100,000 sheets of the developer of the present invention based on the above Examples 1 to 3 and the comparative developer based on Comparative Examples 1 to 4 were made using an electronic copying machine (FT6080 manufactured by Ricoh Co., Ltd.). We also evaluated the quality of yellowtail. The results are shown in Table 2. Here, the amount of charge was measured by the blow-off method, and the non-image area was measured using a Macbeth reflection densitometer.
「以下余白」
上記第２表から明らかなように本発明の電子写真用乾式
二成分現像剤は、帯電量が初期から１０万枚複写後まで
安定し、地力ブリも少なかった。"Margin below" As is clear from Table 2 above, the electrophotographic dry two-component developer of the present invention had a stable charge amount from the initial stage to after 100,000 copies had been made, and had little ground force blur.
以上説明したように、本発明はカーボンブラックをトナ
ー粒子表面に付着させることにより、トナー粒子の帯電
性を損なわずに現像スリーブの表面へのトナー付着を防
止することができるため、長寿命であり、地力ブリの少
ない電子写真用乾式二成分現像剤を提供することができ
る。As explained above, the present invention can prevent toner from adhering to the surface of the developing sleeve without impairing the chargeability of the toner particles by adhering carbon black to the surface of the toner particles, resulting in a long life. , it is possible to provide a dry two-component developer for electrophotography with less blurring.
特許出願人 株式会社巴川製紙所Patent applicant: Tomoekawa Paper Mills Co., Ltd.
Claims (2)
ックをトナー重量に対して０．１〜１％付着させたトナ
ーとキャリアとからなることを特徴とする電子写真用乾
式二成分現像剤。(1) A dry two-component developer for electrophotography, characterized in that it consists of a toner having 0.1 to 1% of carbon black with a pH of 2.5 to 6 adhered to the surface of the toner particles, based on the weight of the toner, and a carrier.
以上であることを特徴とする請求項１記載の電子写真用
乾式二成分現像剤。(2) The specific resistance of the carrier is 10^1^0Ω・cm
The dry two-component developer for electrophotography according to claim 1, which is as follows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1039337A JPH0810337B2 (en) | 1989-02-21 | 1989-02-21 | Dry two-component developer for electrophotography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1039337A JPH0810337B2 (en) | 1989-02-21 | 1989-02-21 | Dry two-component developer for electrophotography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02219063A true JPH02219063A (en) | 1990-08-31 |
| JPH0810337B2 JPH0810337B2 (en) | 1996-01-31 |
Family
ID=12550276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1039337A Expired - Fee Related JPH0810337B2 (en) | 1989-02-21 | 1989-02-21 | Dry two-component developer for electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0810337B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04276762A (en) * | 1991-03-05 | 1992-10-01 | Tomoegawa Paper Co Ltd | Toner for electrophotography |
| JPH04328758A (en) * | 1991-04-30 | 1992-11-17 | Mitsubishi Kasei Corp | Developer for developing electrostatic charge image |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56162754A (en) * | 1980-05-19 | 1981-12-14 | Tomoegawa Paper Co Ltd | Electrophotographic toner |
| JPS5990858A (en) * | 1982-11-16 | 1984-05-25 | Konishiroku Photo Ind Co Ltd | Toner having negative electrostatic charging property for two-component type developer |
| JPS6122353A (en) * | 1984-07-11 | 1986-01-30 | Showa Denko Kk | Production of toner for developing electrostatic charge image |
| JPS6191670A (en) * | 1984-10-11 | 1986-05-09 | Fuji Xerox Co Ltd | Developing method |
| JPS6371862A (en) * | 1986-09-16 | 1988-04-01 | Fuji Xerox Co Ltd | Developer composition |
-
1989
- 1989-02-21 JP JP1039337A patent/JPH0810337B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56162754A (en) * | 1980-05-19 | 1981-12-14 | Tomoegawa Paper Co Ltd | Electrophotographic toner |
| JPS5990858A (en) * | 1982-11-16 | 1984-05-25 | Konishiroku Photo Ind Co Ltd | Toner having negative electrostatic charging property for two-component type developer |
| JPS6122353A (en) * | 1984-07-11 | 1986-01-30 | Showa Denko Kk | Production of toner for developing electrostatic charge image |
| JPS6191670A (en) * | 1984-10-11 | 1986-05-09 | Fuji Xerox Co Ltd | Developing method |
| JPS6371862A (en) * | 1986-09-16 | 1988-04-01 | Fuji Xerox Co Ltd | Developer composition |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04276762A (en) * | 1991-03-05 | 1992-10-01 | Tomoegawa Paper Co Ltd | Toner for electrophotography |
| JPH04328758A (en) * | 1991-04-30 | 1992-11-17 | Mitsubishi Kasei Corp | Developer for developing electrostatic charge image |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0810337B2 (en) | 1996-01-31 |
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