JPH05224465A - Electrophotographic dry developer - Google Patents

Electrophotographic dry developer

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Publication number
JPH05224465A
JPH05224465A JP4059126A JP5912692A JPH05224465A JP H05224465 A JPH05224465 A JP H05224465A JP 4059126 A JP4059126 A JP 4059126A JP 5912692 A JP5912692 A JP 5912692A JP H05224465 A JPH05224465 A JP H05224465A
Authority
JP
Japan
Prior art keywords
toner
borodisalicylate
resin
dry developer
compd
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
Application number
JP4059126A
Other languages
Japanese (ja)
Inventor
Yoshihito Suwa
義仁 諏訪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tomoegawa Co Ltd
Original Assignee
Tomoegawa Paper Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tomoegawa Paper Co Ltd filed Critical Tomoegawa Paper Co Ltd
Priority to JP4059126A priority Critical patent/JPH05224465A/en
Publication of JPH05224465A publication Critical patent/JPH05224465A/en
Pending legal-status Critical Current

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  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE:To prevent the surface fogging caused by a defective electrification, toner scattering, toner dropping, and the decrease in developing density caused by an excess electrification by mixing a toner containing a specified borodisalicylate compd. and a ferrite carrier, whose surface is coated with a silicone resin. CONSTITUTION:This developer is obtd. by mixing the toner containing a borodisalicylate compd. expressed by formula and a ferrite carrier whose surface is coated with a silicone resin. In the formula, R1 and R4 are hydrogen atoms, alkyl groups, substd. or unsubstd. aromatic rings (including condensed rings), R2 and R3 are substd. or unsubstd. aromatic rings (including condensed rings), X<+> is a cation, and n is 1 or 2. The cation X<+> in the borosalicylate compd. is selected from Li<+>, K<+>, NH4<+> and Zn<2+>. This borodisalicylate compd. is added by 0.1-10 pts.wt. into 100 pts.wt. of the binder resin.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は電子写真法、静電記録法
において形成される静電荷像を現像するための乾式現像
剤に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry developer for developing an electrostatic image formed by electrophotography or electrostatic recording.

【0002】[0002]

【従来の技術】従来電子写真法で用いられている静電荷
現像用トナーは、鉄粉或いはフェライトの如き磁性キャ
リヤーとの摩擦帯電によって現像に必要とされる所定の
帯電量が付与されたトナーが、クーロン力により感光体
ドラム上の静電潜像上に付着し、転写体に転写されるこ
とによって現像される。このようなトナーを用いてより
効率的な現像を行なうためには、トナーがキャリアとの
摩擦によって、所定の帯電レベルまで速やかに到達し、
かつその帯電レベルを長く維持することが大切である。
そのため、トナーに適量の帯電制御剤を加えることと、
トナーとキャリアとの相性を探る努力がなされてきた。
2. Description of the Related Art A toner for electrostatic charge development conventionally used in electrophotography is a toner to which a predetermined amount of charge required for development is imparted by frictional charging with a magnetic carrier such as iron powder or ferrite. , Coulombic force causes the toner to adhere to the electrostatic latent image on the photosensitive drum, and is transferred to the transfer body to be developed. In order to perform more efficient development using such toner, the toner quickly reaches a predetermined charging level due to friction with the carrier,
And it is important to maintain the charge level for a long time.
Therefore, adding an appropriate amount of charge control agent to the toner,
Efforts have been made to find compatibility between toner and carrier.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、この従
来の技術によっては、トナーの帯電レベルを最適に制御
することは困難であり、トナーの帯電レベルを最適に制
御することが困難なため帯電不良による地カブリ、トナ
ーの飛散、トナー落ち、過剰帯電による現像濃度の低下
などの問題が反復して起きているのが現状である。本発
明はこのような課題を解決することを目的とする。
However, with this conventional technique, it is difficult to optimally control the charge level of the toner, and it is difficult to optimally control the charge level of the toner. The current situation is that problems such as background fog, toner scattering, toner drop, and decrease in development density due to overcharge occur repeatedly. The present invention aims to solve such problems.

【0004】[0004]

【課題を解決するための手段】本発明は上記の如き実情
に鑑みてなされたもので、その概要は次下のとおりであ
る。請求項1の発明は、下記一般式で表わされるボロジ
サリチル酸塩化合物を含有したトナーと、シリコーン樹
脂で表面を被覆されたフェライトキャリアとを混合して
なることを特徴とする電子写真用乾式現像剤である。
The present invention has been made in view of the above-mentioned circumstances, and the outline thereof is as follows. The invention according to claim 1 is characterized in that a toner containing a borodisalicylate compound represented by the following general formula is mixed with a ferrite carrier whose surface is coated with a silicone resin, and is dry-developed for electrophotography. It is an agent.

【0005】[0005]

【化2】 [Chemical 2]

【0006】(式中、R1 およびR4 は水素原子、アル
キル基、置換または非置換の芳香環(縮合環も含む)を
示し、R2 およびR3 は置換または非置換の芳香環(縮
合環も含む)を示し、X+ はカチオンを示す、またnは
1または2である。)又、請求項2の発明は、請求項1
の発明においてボロジサリチル酸塩化合物のカチオン部
+ がLi+ ,K+ ,NH4 + 又はZn2+から選択され
た電子写真用乾式現像剤である。更に請求項3の発明
は、請求項1の発明において.ポロジサリチル酸塩化合
物をバインダー樹脂100重量部に対して0.1〜10
重量部とした電子写真用乾式現像剤である。
(Wherein R 1 and R 4 represent a hydrogen atom, an alkyl group, a substituted or unsubstituted aromatic ring (including a condensed ring), and R 2 and R 3 represent a substituted or unsubstituted aromatic ring (condensed ring). (Including a ring), X + represents a cation, and n is 1 or 2.) The invention of claim 2 also provides
In the invention described above, the cation moiety X + of the borodisalicylate compound is a dry developer for electrophotography selected from Li + , K + , NH 4 + or Zn 2+ . Furthermore, the invention of claim 3 is the same as the invention of claim 1. The porosi salicylate compound is added in an amount of 0.1 to 10 with respect to 100 parts by weight of the binder resin.
This is a dry developer for electrophotography, which is made up by weight.

【0007】本発明について更に詳述する。本発明で用
いられる電荷制御剤であるボロジサリチル酸塩化合物は
化学的、熱的に安定で溶剤溶解性に優れ、プラスチック
あるいはゴムとの相溶性に優れており、かつその適量を
トナー中に配合することにより、好ましい電荷制御作用
を有するとの知見を得た。その構造式中アニオンのR1
およびR4 のアルキル基には、メチル基、エチル基、n
−ブチル基、iso−アミル基、n−ドデシル基、n−
オクタデシル基、シクロヘキシル基等があげられ、
1 ,R2 ,R3 およびR4 の芳香環には、ベンゼン
環、ナフタリン環等があげられ、置換基にはアルキル
基、アルコキシ基、ハロゲン原子、アリール基、アラル
キル基、ニトロ基、シアノ基等があげられる。
The present invention will be described in more detail. The charge control agent borodisalicylate compound used in the present invention is chemically and thermally stable, excellent in solvent solubility, excellent in compatibility with plastics or rubber, and an appropriate amount thereof is compounded in the toner. By doing so, it was found that it has a preferable charge control action. R 1 of the anion in the structural formula
And the alkyl group of R 4 includes a methyl group, an ethyl group, n
-Butyl group, iso-amyl group, n-dodecyl group, n-
Octadecyl group, cyclohexyl group, etc.,
Examples of the aromatic ring of R 1 , R 2 , R 3 and R 4 include a benzene ring and a naphthalene ring. Substituents include an alkyl group, an alkoxy group, a halogen atom, an aryl group, an aralkyl group, a nitro group and a cyano group. Examples include groups.

【0008】カチオンには種々の無機カチオン、有機カ
チオンを用いることができる。無機カチオンには、水素
イオン、金属イオンがあげられ、Li+ ,Na+
+ ,Ag+ ,Mg2+,Ca2+,Ba2+,Sr2+,Pb
2+,Mn2+,Co2+,Ni2+,Zn2+等があげられる。
又、有機カチオンとしては、種々のアンモニウムイオ
ン、イミニウムイオン又はホスホニウムイオン等があげ
られる。入手製造が容易なものとしてはLi+ ,K+
NH4 + 又はZn2+が好ましい。
As the cation, various inorganic cations and organic cations can be used. Inorganic cations include hydrogen ions and metal ions, and Li + , Na + ,
K + , Ag + , Mg 2+ , Ca 2+ , Ba 2+ , Sr 2+ , Pb
2+ , Mn 2+ , Co 2+ , Ni 2+ , Zn 2+ and the like can be mentioned.
Examples of the organic cation include various ammonium ions, iminium ions, phosphonium ions and the like. Li + , K + ,
NH 4 + or Zn 2+ are preferred.

【0009】本発明の一般式(1)で表わされる錯体塩
は、例えばホウ酸とアミンの水溶液にマンデル酸又はベ
ンジル酸を加え反応させて容易に作成することができ
る。
The complex salt represented by the general formula (1) of the present invention can be easily prepared, for example, by adding mandelic acid or benzylic acid to an aqueous solution of boric acid and an amine and reacting them.

【0010】本発明におけるトナーの最適組成は、バイ
ンダー樹脂100重量部に対して、ボロジサリチル酸化
合物を0.1〜10重量部を含有するようにした負帯電
性トナーが好ましい。ボロジサリチル酸化合物が0.1
〜10重量部を外れる場合は、トナーの所望の帯電が得
られず、又、逆帯電トナーが多く発生する傾向があり好
ましくない。
The optimum composition of the toner in the present invention is preferably a negatively chargeable toner containing 0.1 to 10 parts by weight of a borodisalicylic acid compound with respect to 100 parts by weight of a binder resin. Borodisalicylic acid compound is 0.1
If the amount is out of 10 parts by weight, the desired charge of the toner cannot be obtained, and a large amount of reversely charged toner tends to be generated, which is not preferable.

【0011】トナーに用いられるバインダー樹脂として
は、スチレン樹脂、パラクロルスチレン樹脂、メチルス
チレン樹脂などのスチレン系樹脂;塩化ビニル樹脂、臭
化ビニル樹脂、ふっ化ビニル樹脂、酢酸ビニル樹脂、プ
ロピオン酸ビニル樹脂、ベンゾエ酸ビニル樹脂などビニ
ルエステル類;アクリル酸メチル、アクリル酸イソブチ
ル、アクリル酸ドデシル、アクリル酸−n−オクチル、
アクリル酸−2−クロル−エチル、アクリル酸フェニ
ル、α−クロルアクリル酸メチル、メタクリル酸メチ
ル、メタアクリル酸エチル、メタクリル酸ブチル、メタ
クリル酸ジアルキルアミノエチルなどのα−メチレン脂
肪族モノカルボン酸のエステル類;アクリロニトリル、
メタクリロニトリル、アクリルアミド例えばビニルメチ
ルエーテル、ビニルイソブチルエーテル類;ビニルメチ
ルケトン、ビニルヘキシルケトンなどのビニルケトン
類;N−ビニルピロール、N−ビニルカルバゾール、N
−ビニルインドール、N−ビニルピロリドンなどのN−
ビニル化合物;などの単量体を重合させたホモポリマー
またはこれらの単量体を2種以上組合わせて共重合させ
たコポリマーあるいはそれらの混合物、あるいはロジン
変性フェノールホルマリン樹脂、エポキシ樹脂、ポリエ
ステル樹脂、ポリウレタン樹脂、セルロース樹脂、ポリ
エーテル樹脂などの非ビニル系熱可塑性樹脂などおよび
これらと前記したビニル樹脂の混合物をあげることがで
きる。
Examples of the binder resin used in the toner include styrene resins such as styrene resin, parachlorostyrene resin, and methylstyrene resin; vinyl chloride resin, vinyl bromide resin, vinyl fluoride resin, vinyl acetate resin, vinyl propionate. Resins, vinyl esters such as vinyl benzoate resin; methyl acrylate, isobutyl acrylate, dodecyl acrylate, -n-octyl acrylate,
Esters of α-methylene aliphatic monocarboxylic acids such as 2-chloro-ethyl acrylate, phenyl acrylate, α-chloromethyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and dialkylaminoethyl methacrylate. Kinds; acrylonitrile,
Methacrylonitrile, acrylamide such as vinyl methyl ether, vinyl isobutyl ethers; vinyl ketones such as vinyl methyl ketone and vinyl hexyl ketone; N-vinyl pyrrole, N-vinyl carbazole, N
-N-, such as vinylindole and N-vinylpyrrolidone
Homopolymers obtained by polymerizing monomers such as vinyl compounds; copolymers obtained by copolymerizing two or more kinds of these monomers or copolymers thereof, or rosin-modified phenol formalin resins, epoxy resins, polyester resins, Examples thereof include non-vinyl type thermoplastic resins such as polyurethane resin, cellulose resin and polyether resin, and mixtures of these with the above vinyl resins.

【0012】次にトナーに使用される着色剤としては、
公知の染料、顔料例えばカーボンブラック、フタロシア
ニンブルー、インダンスレンブルー、ピーコックブル
ー、パーマネントレッド、レーキレッド、ローダミンレ
ーキハンザイエロー、パーマネントイエロー、ベンジジ
ンイエロー等を広く使用できる。トナー粒子は、公知の
方法によって、例えば前述のボロジサリチル酸化合物と
上記バインダー樹脂成分と着色剤としてのカーボンブラ
ック等を良く混合し、溶融混練した後、冷却、固化後、
微粉砕分級して得ることができる。
Next, as the colorant used in the toner,
Well-known dyes and pigments such as carbon black, phthalocyanine blue, indanthrene blue, peacock blue, permanent red, lake red, rhodamine lake Hansa yellow, permanent yellow and benzidine yellow can be widely used. The toner particles are well-known, for example, well mixed with the above-mentioned borodisalicylic acid compound, the binder resin component and carbon black as a colorant, melt-kneaded, and after cooling and solidifying,
It can be obtained by finely pulverizing and classifying.

【0013】一方本発明を構成するキャリアとしては、
平均粒径20〜1000μm のフェライト系磁性粉から
なるコア材にシリコーン樹脂を被覆したものである。こ
のフェライト系磁性粉はFe2 3 と2価の金属酸化物
との化合物であり、MO・Fe2 3 の分子式で示され
スピネル型の格子構造を有する。但し、上記に於いて、
MはMn,Mg,Cu,Co,Ni,Zn,Cd等であ
る。本発明で用いられるシリコーン樹脂としては、従来
から知られているいずれのシリコーン樹脂であってもよ
いが、下記の一般式で表わされるものが常温硬化型シリ
コーン樹脂があげられる。
On the other hand, as the carrier constituting the present invention,
A core material made of ferrite magnetic powder having an average particle diameter of 20 to 1000 μm is coated with a silicone resin. This ferrite magnetic powder is a compound of Fe 2 O 3 and a divalent metal oxide, and has a spinel type lattice structure represented by the molecular formula of MO · Fe 2 O 3 . However, in the above,
M is Mn, Mg, Cu, Co, Ni, Zn, Cd or the like. The silicone resin used in the present invention may be any conventionally known silicone resin, but the one represented by the following general formula is a room temperature curable silicone resin.

【0014】[0014]

【化3】 但し、Rは水素原子、ハロゲン原子、ヒドロキシ基、メ
トキシ基、C1 〜C4の低級アルキル基又はフェニル
基。シリコーン樹脂の市販品としては、例えば信越化学
社製のKR−271,KR−255,KR−152や東
レシリコーン社製のSR2400,SH840,SR2
406等がある。
[Chemical 3] Here, R is a hydrogen atom, a halogen atom, hydroxy group, methoxy group, a lower alkyl group or a phenyl group C 1 -C 4. Examples of commercially available silicone resins include Shin-Etsu Chemical's KR-271, KR-255, KR-152 and Toray Silicone's SR2400, SH840, SR2.
There are 406 etc.

【0015】なお、フェライト磁性粉に対するシリコー
ン樹脂の被覆方法としては、該樹脂を溶剤で溶解して、
前記したコア材の表面に流動床型コーティング装置等の
公知の手段で塗布すればよい。本発明は前記したように
特定構造のボロジサリチル酸化合物を電荷制御剤とする
トナーと、フェライト磁性粉をコア材として該コア材上
にシリコーン樹脂を被覆したキャリアとを組合わせるこ
とにより始めて優れた負帯電特性を維持できるのであ
る。
As a method for coating the ferrite magnetic powder with the silicone resin, the resin is dissolved in a solvent,
It may be applied to the surface of the core material described above by a known means such as a fluidized bed type coating device. As described above, the present invention is excellent only by combining a toner using a borodisalicylic acid compound having a specific structure as a charge control agent and a carrier in which a ferrite magnetic powder is used as a core material and a silicone resin is coated on the core material. The negative charging characteristic can be maintained.

【0016】[0016]

【実施例】次に本発明の実施例について説明する。 実施例1 バインダー樹脂として、スチレン−アクリル共重合体 (Mn=4.2×103 ,Mw=13.5×104 ,M
w/Mn=32) 100重量部と、電荷制御剤としてボロジルサリチル酸
化合物(式1に示す化合物において、カチオンをZn+2
としたもの)2重量部と、カーボンブラック(キャボッ
ト社製商品名ブラックパールL)5重量部とをよく混合
し、熱混練後、冷却固化し、その後粉砕して粒径10〜
12μm のトナーを得た。一方粒径74〜149μm の
球形Fe2 3 −CuO−ZnOフェライト磁性粉(パ
ウダーテック社製商品名FLー100)にシリコーン樹
脂(東レシリコーン社製商品名SR−2406)を流動
床コーティング装置を用いて公知の方法にて被覆し、シ
リコーン樹脂被覆キャリアを得た。次に上記トナーと上
記のキャリアとを重量比にて3:97の割合で混合し、
本発明の電子写真用乾式現像剤とした。これを用いて多
数枚連続複写テストをシャープ社製複写機SF−980
0にて行なった。
EXAMPLES Next, examples of the present invention will be described. Example 1 As a binder resin, a styrene-acrylic copolymer (Mn = 4.2 × 10 3 , Mw = 13.5 × 10 4 , M
w / Mn = 32) 100 parts by weight and a borodyl salicylic acid compound as a charge control agent (in the compound represented by the formula 1, the cation is Zn +2
2 parts by weight of carbon black and 5 parts by weight of carbon black (trade name: Black Pearl L, manufactured by Cabot Corp.) are thoroughly mixed, heat-kneaded, cooled and solidified, and then ground to a particle size of 10 to 10.
12 μm toner was obtained. On the other hand, a spherical Fe 2 O 3 —CuO—ZnO ferrite magnetic powder with a particle size of 74 to 149 μm (product name FL-100 manufactured by Powder Tech Co., Ltd.) and silicone resin (product name SR-2406 manufactured by Toray Silicone Co., Ltd.) were placed in a fluidized bed coating device. It was used and coated by a known method to obtain a silicone resin-coated carrier. Next, the toner and the carrier are mixed in a weight ratio of 3:97,
The dry developer for electrophotography according to the present invention was used. Using this, a multi-sheet continuous copying test was performed by Sharp Co. SF-980
It was performed at 0.

【0017】実施例2 電荷制御剤であるボロジサリチル酸化合物の一般式1に
おいてカチオンをK+にしたものを用いる外は、実施例
1と同様にして、本発明の電子写真用乾式現像剤を得、
これを用いて実施例1と同様な連続複写テストを行なっ
た。 実施例3 電荷制御剤であるボロジサリチル酸化合物の一般式1に
おいてカチオンをLi+ にしたものを用いる外は、実施
例1と同様にして、本発明の電子写真用乾式現像剤を
得、これを用いて実施例1と同様な連続複写テストを行
なった。
Example 2 The electrophotographic dry developer of the present invention was prepared in the same manner as in Example 1 except that the cation was replaced by K + in the general formula 1 of the borodisalicylic acid compound as the charge control agent. Get
Using this, a continuous copying test similar to that in Example 1 was conducted. Example 3 A dry developer for electrophotography of the present invention was obtained in the same manner as in Example 1 except that the cation was changed to Li + in the general formula 1 of the borodisalicylic acid compound as the charge control agent. The same continuous copying test as in Example 1 was conducted using the above.

【0018】比較例1 電荷制御剤を含有してないことを除いては実施例1と同
様にして電子写真用乾式現像剤を得て、実施例1と同様
な連続複写テストを行なった。 比較例2 フェライトキャリアにシリコーン樹脂をコートしないこ
と以外は実施例1と同様にして電子写真用乾式現像剤を
得て、実施例1と同様な連続複写テストを行なった。 比較例3 フェライトキャリアにアクリル樹脂をコートすること以
外は実施例1と同様にして電子写真用乾式現像剤を得
て、実施例1と同様な連続複写テストを行なった。
Comparative Example 1 An electrophotographic dry developer was obtained in the same manner as in Example 1 except that the charge control agent was not contained, and the same continuous copying test as in Example 1 was conducted. Comparative Example 2 An electrophotographic dry developer was obtained in the same manner as in Example 1 except that the ferrite carrier was not coated with a silicone resin, and the same continuous copying test as in Example 1 was performed. Comparative Example 3 An electrophotographic dry developer was obtained in the same manner as in Example 1 except that the ferrite carrier was coated with an acrylic resin, and the same continuous copying test as in Example 1 was performed.

【0019】各実施例及び比較例の評価結果を総合する
と表1のようになる。但し、表1においてトナーの飛散
の評価基準は以下のとおりである。 ◎ 飛散全くなく良好 ○ 若干の飛散はあるが実用上良好の範囲 △ かなりの飛散はあるが実用可能 × 飛散が著るしく実用不可能 また、表1におけるI.D.は画像濃度、B.G.は地
カブリをハンター白色度計で測定したものであり、Q/
Mはブローオフ法による摩擦帯電量測定器によって、ト
ナーの摩擦帯電量を測定したものである。
Table 1 shows a summary of the evaluation results of Examples and Comparative Examples. However, the evaluation criteria of toner scattering in Table 1 are as follows. ◎ Good with no scattering ○ Good range for practical use with some scattering △ Practical with considerable scattering × Significantly unscatterable scattering D. Is the image density, and B. G. Is the ground fog measured with a Hunter whiteness meter, and Q /
M is the amount of triboelectrification of toner measured by a triboelectrification amount measuring device by the blow-off method.

【0020】[0020]

【表1】 [Table 1]

【0021】[0021]

【発明の効果】以上の比較試験から明らかなとおり、本
発明によれば、ID,BG,Q/Mが初期から5万枚程
度の連続複写を行なっても変りはなく、飛散もほとんど
ないか、あっても実用上良好な範囲であることが確認さ
れた。従って極めて実用価値の大きい乾式現像剤を提供
するものである。
As is apparent from the above comparative tests, according to the present invention, even if ID, BG, and Q / M are continuously copied for about 50,000 sheets from the beginning, there is no change and there is almost no scattering. However, it was confirmed that the range was practically good. Therefore, the present invention provides a dry developer having a great practical value.

【手続補正書】[Procedure amendment]

【提出日】平成4年8月4日[Submission date] August 4, 1992

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0016[Correction target item name] 0016

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0016】[0016]

【実施例】次に本発明の実施例について説明する。 実施例1 バインダー樹脂として、スチレン−アクリル共重合体 (Mn=4.2×10,Mw=13.5×10,M
w/Mn=32) 100重量部と、電荷制御剤としてボロジサリチル酸化
合物(式1に示す化合物において、カチオンをZn+2
としたもの)2重量部と、カーボンブラック(キャボッ
ト社製商品名ブラックパールL)5重量部とをよく混合
し、熱混練後、冷却固化し、その後粉砕して粒径10〜
12μmのトナーを得た。一方粒径74〜149μmの
球形Fe−CuO−ZnOフェライト磁性粉(パ
ウダーテック社製商品名FL−100)にシリコーン樹
脂(東レシリコーン社製商品名SR−2406)を流動
床コーティング装置を用いて公知の方法にて被覆し、シ
リコーン樹脂被覆キャリアを得た。次に上記トナーと上
記のキャリアとを重量比にて3:97の割合で混合し、
本発明の電子写真用乾式現像剤とした。これを用いて多
数枚連続複写テストをシャープ社製複写機SF−980
0にて行なった。
EXAMPLES Next, examples of the present invention will be described. Example 1 As a binder resin, a styrene-acrylic copolymer (Mn = 4.2 × 10 3 , Mw = 13.5 × 10 4 , M
w / Mn = 32) and 100 parts by weight, the rag Jissah salicylic acid compound (compounds shown in Formula 1 as a charge control agent, cations Zn +2
2 parts by weight of carbon black and 5 parts by weight of carbon black (trade name: Black Pearl L, manufactured by Cabot Corp.) are thoroughly mixed, heat-kneaded, cooled and solidified, and then ground to a particle size of 10 to 10.
12 μm toner was obtained. On the other hand, a spherical Fe 2 O 3 —CuO—ZnO ferrite magnetic powder having a particle size of 74 to 149 μm (product name FL-100 manufactured by Powder Tech Co., Ltd.) and silicone resin (product name SR-2406 manufactured by Toray Silicone Co., Ltd.) were applied to a fluidized bed coating device. It was used and coated by a known method to obtain a silicone resin-coated carrier. Next, the toner and the carrier are mixed in a weight ratio of 3:97,
The dry developer for electrophotography according to the present invention was used. Using this, a multi-sheet continuous copying test was performed by Sharp Co. SF-980
It was performed at 0.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 G03G 9/113 G03G 9/10 321 352 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location G03G 9/113 G03G 9/10 321 352

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 下記の一般式で表わされるボロジサリチ
ル酸塩化合物を含有したトナーと、シリコーン樹脂で表
面を被覆されたフェライトキャリアとを混合してなるこ
とを特徴とする電子写真用乾式現像剤。 【化1】 (式中、R1 およびR4 は水素原子、アルキル基、置換
または非置換の芳香環(縮合環も含む)を示し、R2
よびR3 は置換または非置換の芳香環(縮合環も含む)
を示し、X+ はカチオンを示す、またnは1または2で
ある。)
1. A dry developer for electrophotography, comprising a mixture of a toner containing a borodisalicylate compound represented by the following general formula and a ferrite carrier whose surface is coated with a silicone resin. .. [Chemical 1] (In the formula, R 1 and R 4 represent a hydrogen atom, an alkyl group, a substituted or unsubstituted aromatic ring (including a condensed ring), and R 2 and R 3 represent a substituted or unsubstituted aromatic ring (including a condensed ring). )
Are shown, X + represents a cation, and n is 1 or 2. )
【請求項2】 ボロジサリチル酸塩化合物のカチオン部
+ がLi+ ,K+,NH4 + 又はZn2+から選択され
た請求項1記載の電子写真用乾式現像剤。
2. The dry developer for electrophotography according to claim 1, wherein the cation moiety X + of the bologysalicylate compound is selected from Li + , K + , NH 4 + or Zn 2+ .
【請求項3】 ボロジサリチル酸塩化合物をバインダー
樹脂100重量部に対して0.1〜10重量部含有せし
めた請求項1記載の電子写真用乾式現像剤。
3. The dry developer for electrophotography according to claim 1, wherein the borodisalicylate compound is contained in an amount of 0.1 to 10 parts by weight based on 100 parts by weight of the binder resin.
JP4059126A 1992-02-14 1992-02-14 Electrophotographic dry developer Pending JPH05224465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4059126A JPH05224465A (en) 1992-02-14 1992-02-14 Electrophotographic dry developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4059126A JPH05224465A (en) 1992-02-14 1992-02-14 Electrophotographic dry developer

Publications (1)

Publication Number Publication Date
JPH05224465A true JPH05224465A (en) 1993-09-03

Family

ID=13104307

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4059126A Pending JPH05224465A (en) 1992-02-14 1992-02-14 Electrophotographic dry developer

Country Status (1)

Country Link
JP (1) JPH05224465A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5111253A (en) * 1989-05-09 1992-05-05 General Electric Company Multicellular FET having a Schottky diode merged therewith
EP0658820A1 (en) * 1993-12-08 1995-06-21 Orient Chemical Industries, Ltd. Negative charge control agent and toner for developing electrostatic image

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6263941A (en) * 1985-09-17 1987-03-20 Fuji Xerox Co Ltd Electric charge exchange controlling agent and developer composition
JPH0233159A (en) * 1988-07-22 1990-02-02 Kao Corp Developer for developing electrostatic charge image
JPH0293546A (en) * 1988-09-30 1990-04-04 Canon Inc Dry type negative chargeable color toner and two-component dry type developer
JPH02110576A (en) * 1988-10-20 1990-04-23 Canon Inc Toner for developing electrostatic charge image
JPH03112990A (en) * 1989-09-27 1991-05-14 Japan Carlit Co Ltd:The New boron complex salt
JPH0572804A (en) * 1991-09-13 1993-03-26 Hitachi Chem Co Ltd Dry toner, developer and image forming method
JPH0572812A (en) * 1991-09-12 1993-03-26 Hitachi Chem Co Ltd Dry toner, developer and image forming method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6263941A (en) * 1985-09-17 1987-03-20 Fuji Xerox Co Ltd Electric charge exchange controlling agent and developer composition
JPH0233159A (en) * 1988-07-22 1990-02-02 Kao Corp Developer for developing electrostatic charge image
JPH0293546A (en) * 1988-09-30 1990-04-04 Canon Inc Dry type negative chargeable color toner and two-component dry type developer
JPH02110576A (en) * 1988-10-20 1990-04-23 Canon Inc Toner for developing electrostatic charge image
JPH03112990A (en) * 1989-09-27 1991-05-14 Japan Carlit Co Ltd:The New boron complex salt
JPH0572812A (en) * 1991-09-12 1993-03-26 Hitachi Chem Co Ltd Dry toner, developer and image forming method
JPH0572804A (en) * 1991-09-13 1993-03-26 Hitachi Chem Co Ltd Dry toner, developer and image forming method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5111253A (en) * 1989-05-09 1992-05-05 General Electric Company Multicellular FET having a Schottky diode merged therewith
EP0658820A1 (en) * 1993-12-08 1995-06-21 Orient Chemical Industries, Ltd. Negative charge control agent and toner for developing electrostatic image

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