JPH0470761A - Electrophotographic dry binary developer - Google Patents
Electrophotographic dry binary developerInfo
- Publication number
- JPH0470761A JPH0470761A JP2182705A JP18270590A JPH0470761A JP H0470761 A JPH0470761 A JP H0470761A JP 2182705 A JP2182705 A JP 2182705A JP 18270590 A JP18270590 A JP 18270590A JP H0470761 A JPH0470761 A JP H0470761A
- Authority
- JP
- Japan
- Prior art keywords
- toner particles
- carbon black
- developer
- carbon
- 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.)
- Granted
Links
- 239000002245 particle Substances 0.000 claims abstract description 23
- 239000006229 carbon black Substances 0.000 claims abstract description 19
- 238000010521 absorption reaction Methods 0.000 claims abstract description 5
- 241000872198 Serjania polyphylla Species 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052799 carbon Inorganic materials 0.000 abstract description 15
- 230000000704 physical effect Effects 0.000 abstract description 3
- 235000019241 carbon black Nutrition 0.000 description 15
- 229920005989 resin Polymers 0.000 description 14
- 239000011347 resin Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 7
- -1 acrylic ester Chemical class 0.000 description 6
- 239000000975 dye Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 241000557626 Corvus corax Species 0.000 description 3
- 239000000969 carrier Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-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
- 238000003756 stirring Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229910002012 Aerosil® Inorganic materials 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
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 241000907663 Siproeta stelenes Species 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 239000003082 abrasive agent Substances 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
- 239000011324 bead Substances 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
- 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
- 150000002148 esters Chemical class 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
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000006247 magnetic powder Substances 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
- 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
- 239000000049 pigment Substances 0.000 description 1
- 239000004584 polyacrylic acid 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
- 239000005033 polyvinylidene 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
- 229920002050 silicone resin Polymers 0.000 description 1
- 239000000126 substance 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ＩＱＩＯΩ・１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 IQIOΩ·1 or more have been used as developer carriers for high image quality and long service 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、トナーの表面にカーボ
ンブラックを付着させることが提案されている。しかし
ながら、従来技術によるカーボンブラックでは現像槽の
撹拌羽根によってトナーの表面から容易にカーボンブラ
ンクが離脱し、転写紙上に離脱したカーボンブラックが
付着して転写紙を汚すという問題（以下、この現象をカ
ーボン汚れと称す）が発生していた。Conventionally, in order to solve the above problem, it has been proposed to attach carbon black to the surface of toner. However, with conventional carbon black, the carbon blank easily separates from the toner surface by the stirring blade of the developer tank, and the separated carbon black adheres to the transfer paper and stains the transfer paper (hereinafter, this phenomenon is referred to as carbon black). (referred to as dirt) had occurred.
本発明は上記の問題に鑑みてなされたものであリ、地力
ブリ、カーボンブラック汚れがなく、長寿命な電子写真
用乾式二成分現像剤を提供するものである。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 dry two-component developer for electrophotography that is free from soil blurring and carbon black stains and has a long life.
本発明者は前記問題を解決すべく種々研究した結果、ト
ナー粒子の表面に特定物性値のカーボンブランクを付着
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 found that the above-mentioned problems can be significantly improved by attaching a carbon blank having specific physical properties to the surface of toner particles, leading to the present invention.
すなわち、本発明はトナー粒子の表面に、粒子径が３０
ｍ、ｕ以上でかつ吸油量が１００ ｍｌ／１００ ｇ以
上のカーボンブラックをトナー粒子１００重量部に対し
て０．０５〜１重量部付着させたトナーとキャリアから
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, in the present invention, on the surface of the toner particles, a particle size of 30
A toner for electrophotography characterized by comprising a toner and a carrier to which 0.05 to 1 part by weight of carbon black having an oil absorption of 100 ml/100 g or more is attached to 100 parts by weight of toner particles. It is a dry two-component developer.
以下、本発明の詳細な説明する。The present invention will be explained in detail below.
本発明の現像剤を構成するトナー粒子の表面に付着させ
るカーボンブランクは、ファーネス法や衝撃法等の方法
によって製造されるものであって、粒子径が３０ｍμ以
上、好ましくは３５ｍμ以上でかつ吸油量が１００ｓ＋
ｆ／１００ｇ以上であることが特徴である。粒子径が３
０ｍμより小さいか、あるいは吸油量が１００ｍ１／１
００ｇより小さいカーボンブランクの場合は、トナー粒
子表面よりカーボンブラックが容易に離脱し、カーボン
汚れを生じる。本発明に適用するカーボンブラックの市
販品としては例えば以下のものが挙げられる。The carbon blank attached to the surface of the toner particles constituting the developer of the present invention is produced by a method such as a furnace method or an impact method, and has a particle size of 30 mμ or more, preferably 35 mμ or more and an oil absorption amount. is 100s+
It is characterized by f/100g or more. Particle size is 3
Is smaller than 0mμ or oil absorption is 100m1/1
In the case of a carbon blank smaller than 0.00 g, carbon black easily separates from the surface of the toner particles, resulting in carbon stains. Examples of commercially available carbon blacks applicable to the present invention include the following.
すなわち、三菱化成工業社製＃２０、＃３０、＃３２、
＃３０５０：米国キャボソト社製Ｖ［ＪＬＣＡＮ ＸＣ
７２Ｒ，ＢＬＡＣＫ ＰＥＡＲＬＳ ２８０． ＢＬＡ
ＣＫ ＰＥＡＲＬＳ１７０ 、ＴＩＮＴＡＣＡＲＢ ３
５ ：コロンビア・カーボン社製ＲＡＶＥＮ ８２５
ＢＥＡＤＳ 、 ＲＡＶＥＮ ８９０ Ｐ
ＯＷＤＥＲ，ＲＡＶＥＮ ２２ＰＯＷＤＥＲ等が挙げ
られ、上記カーボンブラン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。That is, #20, #30, #32 manufactured by Mitsubishi Chemical Industries, Ltd.
#3050: V [JLCAN XC made by Cabo Soto, USA
72R, BLACK PEARLS 280. B.L.A.
CK PEARLS170, TINTACARB 3
5: RAVEN 825 manufactured by Columbia Carbon Co.
BEADS, RAVEN 890P
Examples include OWDER, RAVEN 22POWDER, and the like, and the above carbon blanks can be used alone or in combination of two or more types.
トナー粒子の表面にカーボンブラックを付着させる方法
は、Ｖ型混合機、タービン型攪拌機、ヘンシェルミキサ
ー等の混合機を用い、トナー粒子１００重量部に対して
特定のカーボンブラックを０．０５〜ＩＮ量部混合し撹
拌することによっておこなねれる。この場合、カーボン
の配合量が０．０５重量部未満であるとカーボンブラッ
クの添加効果が少なく、現像スリーブの表面へのトナー
付着が発生し、一方、１重量部を越えるとトナーの固有
抵抗が低下するため画質が悪くなる。A method for attaching carbon black to the surface of toner particles is to use a mixer such as a V-type mixer, a turbine-type stirrer, or a Henschel mixer, and add a specific carbon black in an amount of 0.05 to IN per 100 parts by weight of toner particles. This can be done by mixing and stirring. In this case, if the amount of carbon added is less than 0.05 part by weight, the effect of adding carbon black will be small and toner adhesion to the surface of the developing sleeve will occur, while if it exceeds 1 part by weight, the specific resistance of the toner will increase. As a result, the image quality deteriorates.
本発明では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, in addition to carbon black, fine silica powder or the like may be attached to the surface of the toner particles in order 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゛−用結着剤と
して使用されているものが使用可能である０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、ポリ塩化ビニリデン樹脂、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.For example, styrene resin, polyacrylic acid ester resin, styrene resin, etc.
Examples include acrylic ester copolymer resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinylidene chloride resin, phenol resin, epoxy resin, and polyester resin. In addition, these resins can be used depending on their purpose.
It is not limited to the type and 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.
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・口取上が好ましく、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％の環状状態に１５
分間放置し、その後キャリアをセルに充てんし、２５０
■の直流電圧を印加して固有抵抗を求める。具体的には
本発明に適用されるキャリアは、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 resistivity of 1010 Ω and is suitable for use, and those commonly used as toner carriers can be used. The specific resistance of the carrier is measured as follows. First, the carrier was placed in an annular state at a temperature of 22 to 25°C and a humidity of 50 to 54% for 15 minutes.
Leave for 25 minutes, then fill the cell with carrier and
Apply the DC voltage (2) and find the specific resistance. Specifically, the carrier applicable to the present invention can be either an iron powder carrier or a ferrite carrier, and a resin whose carrier surface is coated with polyester resin, fluorine resin, acrylic resin, silicone resin, etc. A coated carrier or a so-called magnetic resin carrier obtained by kneading magnetic powder with a binder resin and granulating it can also be used.
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、実施例において部とは重量部を示す。In the Examples, parts refer to parts by weight.
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線後、粉砕分級して
平均粒子径が１１．５μｍのトナー粒子を得た。Examples 1 to 3, Comparative Examples 1 to 4 Materials having the following formulations were mixed, melted and mixed, and then pulverized and classified to obtain toner particles having an average particle diameter of 11.5 μm.
次に上記トナー粒子１００重量部に対して第１表に示す
ような配合比にて各種のカーボンブランクを０．２部の
Ｓｉｎｇ （日本アエロジル社製Ｒ９７２）の共存下で
ヘンシェルミキサーを使用して混合し、カーボンブラッ
クをトナー粒子の表面に付着せしめ本発明および比較用
のトナーを得た。Next, various carbon blanks were added to 100 parts by weight of the toner particles at the mixing ratio shown in Table 1 using a Henschel mixer in the presence of 0.2 parts of Sing (R972 manufactured by Nippon Aerosil Co., Ltd.). By mixing, carbon black was attached to the surface of the toner particles to obtain toners of the present invention and comparative toners.
次に上記第１表より得られた実施例１〜３および比較例
１〜５のトナー３．５部に対して、シリコーン系樹脂で
被覆された固有抵抗が１０ＩｚΩ・１のフェライトキャ
リア（Ｐ９５−１００ 、パウダーチック社製）１００
部を混合して現像剤を作製した。Next, to 3.5 parts of the toners of Examples 1 to 3 and Comparative Examples 1 to 5 obtained from Table 1 above, a ferrite carrier (P95- 100, manufactured by Powder Chick) 100
A developer was prepared by mixing the two parts.
上記実施例に基づく本発明の現像剤及び比較例に基づく
比較用の現像剤を電子複写機（リコー社製ＦＴ６０８０
）にて１部万枚までの多数枚複写を行い、摩擦帯電量
、地力プリ及びカーボン汚れの評価を行った。その結果
を第２表に示す。ここで摩擦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。また、カーボン汚れはＡ４サイズの転写紙上
に付着したカーボンフ゛ラックを目視によりカウントし
、その個数をもって評価した。The developer of the present invention based on the above examples and the comparative developer based on the comparative example were applied to an electronic copying machine (FT6080 manufactured by Ricoh Co., Ltd.).
), a large number of copies (up to 10,000 copies) were made, and the amount of frictional charge, soil strength, and carbon stain were evaluated. The results are shown in Table 2. Here, the amount of triboelectric charge was measured by the blow-off method, and the amount of frictional charge was measured in the non-image area using a Macbeth reflection densitometer. Further, carbon stains were evaluated by visually counting the number of carbon flakes attached to an A4 size transfer paper.
第２表から明らかなように本発明の現像剤は、初期よｊ
／）１０万枚複写後まで安定した摩擦帯電量を維持しな
がら、地力ブリも少なく、カーボン汚れもまったく発生
しなかった。一方、比較用の現像剤は、初期よりカーボ
ン汚れが発生し、とくに比較例４及び比較例５において
は地力ブリが多い画像であった。As is clear from Table 2, the developer of the present invention
/) While maintaining a stable amount of triboelectric charge even after copying 100,000 copies, there was little ground braking and no carbon stains occurred at all. On the other hand, in the comparative developer, carbon stains were generated from the beginning, and in particular, Comparative Examples 4 and 5 produced images with a lot of ground blur.
以上のとおり、本発明は特定の物性値を有するカーボン
ブラックをトナ粒子の表面に付着させることにより、地
力ブリ、カーボン汚れがない長寿命な電子写真用乾式二
成分現像剤を提供することができる。As described above, the present invention can provide a long-life dry two-component developer for electrophotography that is free from soil blur and carbon stains by attaching carbon black having specific physical properties to the surface of toner particles. .
特許出願人 株式会社巴川製紙所Patent applicant: Tomoekawa Paper Mills Co., Ltd.
Claims (2)
つ吸油量が１００ｍｌ／１００ｇ以上のカーボンブラッ
クをトナー粒子１００重量部に対して０．０５〜１重量
部付着させたトナーとキャリア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) Consisting of a toner and a carrier in which 0.05 to 1 part by weight of carbon black with a particle size of 30 mμ or more and an oil absorption of 100 ml/100 g or more is adhered to the surface of the toner particles per 100 parts by weight of the toner particles. A dry two-component developer for electrophotography characterized by the following.
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 |
|---|---|---|---|
| JP2182705A JPH07107609B2 (en) | 1990-07-12 | 1990-07-12 | Dry two-component developer for electrophotography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2182705A JPH07107609B2 (en) | 1990-07-12 | 1990-07-12 | Dry two-component developer for electrophotography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0470761A true JPH0470761A (en) | 1992-03-05 |
| JPH07107609B2 JPH07107609B2 (en) | 1995-11-15 |
Family
ID=16122997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2182705A Expired - Fee Related JPH07107609B2 (en) | 1990-07-12 | 1990-07-12 | Dry two-component developer for electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07107609B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999012078A1 (en) * | 1997-08-29 | 1999-03-11 | Nippon Zeon Co., Ltd. | Toner for electrostatic image development and process for producing the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5333151U (en) * | 1976-08-30 | 1978-03-23 | ||
| JPS57181553A (en) * | 1981-04-30 | 1982-11-09 | Konishiroku Photo Ind Co Ltd | Toner for developing electrostatic charge image and its manufacture |
| JPS6371862A (en) * | 1986-09-16 | 1988-04-01 | Fuji Xerox Co Ltd | Developer composition |
| JPH0269765U (en) * | 1988-11-17 | 1990-05-28 |
-
1990
- 1990-07-12 JP JP2182705A patent/JPH07107609B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5333151U (en) * | 1976-08-30 | 1978-03-23 | ||
| JPS57181553A (en) * | 1981-04-30 | 1982-11-09 | Konishiroku Photo Ind Co Ltd | Toner for developing electrostatic charge image and its manufacture |
| JPS6371862A (en) * | 1986-09-16 | 1988-04-01 | Fuji Xerox Co Ltd | Developer composition |
| JPH0269765U (en) * | 1988-11-17 | 1990-05-28 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999012078A1 (en) * | 1997-08-29 | 1999-03-11 | Nippon Zeon Co., Ltd. | Toner for electrostatic image development and process for producing the same |
| US6440628B1 (en) | 1997-08-29 | 2002-08-27 | Nippon Zeon Co., Ltd. | Tones for development of electrostatic image and production process thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07107609B2 (en) | 1995-11-15 |
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