JP2000019787A - Electrophotographic developer - Google Patents
Electrophotographic developerInfo
- Publication number
- JP2000019787A JP2000019787A JP10196486A JP19648698A JP2000019787A JP 2000019787 A JP2000019787 A JP 2000019787A JP 10196486 A JP10196486 A JP 10196486A JP 19648698 A JP19648698 A JP 19648698A JP 2000019787 A JP2000019787 A JP 2000019787A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- liquid developer
- modified
- vegetable oil
- electrophotographic
- 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.)
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Links
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- Liquid Developers In Electrophotography (AREA)
Abstract
(57)【要約】
【課題】 液体現像剤を用いた複写機、プリンタから排
出されるキャリア液の量を低減することができ、しか
も、火災の危険性が少なく、且つ帯電特性及び帯電安定
性の良好なキャリア液を用いる液体現像剤を提供するこ
と
【解決手段】 着色剤、樹脂、キャリア液を少なくとも
含む電子写真液体現像剤において、キャリア液が植物油
又はその変性油を含むことを特徴とする電子写真液体現
像剤。PROBLEM TO BE SOLVED: To reduce the amount of a carrier liquid discharged from a copying machine or a printer using a liquid developer, to reduce the risk of fire, and to improve charging characteristics and charging stability. The present invention provides an electrophotographic liquid developer containing at least a colorant, a resin and a carrier liquid, wherein the carrier liquid contains a vegetable oil or a modified oil thereof. Electrophotographic liquid developer.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は電子写真、静電記録
等の静電荷像現像用の液体現像剤組成物で、特に植物油
を主体としたキャリア液体を用いる高画質、無臭な複写
物を得る液体現像剤組成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid developer composition for developing electrostatic images such as electrophotography and electrostatic recording, and in particular, to obtain a high-quality, odorless copy using a carrier liquid mainly composed of vegetable oil. The present invention relates to a liquid developer composition.
【０００２】[0002]
【従来の技術】静電荷像現像用の液体現像剤組成物は公
知（例えば、米国特許第３，８０６，３５４号明細書を
参照、この米国特許明細書中の記載は本明細書中で引用
される）である。該米国特許明細書は１種以上の液体ベ
ヒクル、顔料及び染料のような着色剤、分散剤、及び粘
度調節添加剤とからなる液体インクを開示している。該
米国特許明細書に開示されているベヒクルの例は鉱油、
ミネラルスピリット及びケロセンであり、着色剤の例は
カーボンブラック、オイルレッド及びオイルブルーであ
る。該米国特許明細書に記載された分散剤にはアルキル
化ポリビニルピロリドンのような物質がある。2. Description of the Related Art Liquid developer compositions for developing electrostatic images are known (for example, see U.S. Pat. No. 3,806,354, the description of which is incorporated herein by reference). Is). The U.S. patent discloses a liquid ink comprising one or more liquid vehicles, colorants such as pigments and dyes, dispersants, and viscosity modifying additives. Examples of vehicles disclosed in the U.S. Pat.
Mineral spirit and kerosene, examples of colorants are carbon black, oil red and oil blue. Dispersants described in the U.S. Patent include materials such as alkylated polyvinylpyrrolidone.
【０００３】更に、米国特許第４，４７６，２１０号明
細書（この米国特許明細書中の記載も参考として本明細
書中で引用される）には、マーキィング粒子を含有する
絶縁性液体分散媒からなり、上記粒子が上記分散媒中に
実質的に不溶の熱可塑性樹脂コア、この熱可塑性樹脂コ
アに不可逆的に化学又は物理的に結合している両親媒性
ブロック又はグラフト共重合安定剤、及び上記熱可塑性
樹脂コア中にインビビジョンさせたカラー染料からなる
液体インク液浸現像剤が開示されている。この米国特許
第４，４７６，２１０号明細書には液体現像剤の歴史及
び評価が記載されている。Further, US Pat. No. 4,476,210 (the description of which is incorporated herein by reference) discloses an insulating liquid dispersion medium containing marking particles. Consisting of a thermoplastic resin core substantially insoluble in the dispersion medium, an amphiphilic block or graft copolymer stabilizer irreversibly chemically or physically bonded to the thermoplastic resin core, Also disclosed is a liquid ink immersion developer comprising a color dye imprinted in the thermoplastic resin core. U.S. Pat. No. 4,476,210 describes the history and evaluation of liquid developers.
【０００４】また、電子写真法における湿式現像方式
は、感光体上に帯電及び画像露光を行なって静電潜像を
形成し、樹脂及び着色剤を主成分とするトナー粒子を通
常脂肪族炭化水素中に分散した液体現像剤で静電潜像を
現像し、得られたトナー画像を転写紙上に転写、定着す
ることで画像を形成するのが一般的である。この方法で
感光体として酸化亜鉛等の光導電材を塗工した感光紙や
感光フィルムを用いる場合は、転写工程を省略し、現像
後直接感光体上にトナー像を定着してもよい。また、感
光体を用いずに電気入力により誘電体上に静電潜像を形
成する静電記録方式等の現像手段としても湿式現像はよ
く利用される。湿式現像方式は、サブミクロンから数μ
ｍ程度の微粒子トナーを上述のように脂肪族炭化水素等
の高電気抵抗率キャリア液中に分散し、主に電気泳動原
理によって潜像を現像する。それ故に、数μｍ以上のト
ナー粒子を用いる乾式現像方式より高解像度の画質が得
られ易いという特徴をもっている。In a wet development method in electrophotography, an electrostatic latent image is formed by performing charging and image exposure on a photoreceptor, and toner particles containing a resin and a colorant as main components are usually made of an aliphatic hydrocarbon. Generally, an electrostatic latent image is developed with a liquid developer dispersed therein, and the obtained toner image is transferred and fixed on transfer paper to form an image. When a photosensitive paper or a photosensitive film coated with a photoconductive material such as zinc oxide is used as the photoreceptor in this method, the transfer step may be omitted, and the toner image may be fixed directly on the photoreceptor after development. In addition, wet development is often used as a developing means such as an electrostatic recording method for forming an electrostatic latent image on a dielectric by an electric input without using a photoreceptor. Wet development method, from submicron to several microns
As described above, a toner having a particle size of about m is dispersed in a carrier liquid having a high electrical resistivity such as an aliphatic hydrocarbon, and a latent image is developed mainly based on the principle of electrophoresis. Therefore, it has a feature that higher resolution image quality can be easily obtained than the dry development method using toner particles of several μm or more.
【０００５】メトカルフェが公表した初期の２つの文献
（Ｋ．Ａ．Ｍｅｔｃａｌｆｅ、Ｊ．Ｓｃｉ．Ｉｎｓｔｒ
ｎｍ．，３２，７４（１９５５）及びｉｂｉｄ．，３
３，１９４（１９５６））には、液体現像剤系の顔料と
してカーボンブラック、酸化マグネシウムをはじめ多く
の有機又は無機顔料類、キャリア液としてはガソリン、
ケロシン、四塩化炭素等が使用できると記載されてい
る。また、メトカルフェの初期の頃の特許公報には、同
じくキャリア液としてハロゲン化炭化水素（特公昭３５
−５５１１号公報）、ポリシロキサン（特公昭３６−１
４８７２号公報）、リグロイン及びこれら石油炭化水素
の混合液（特公昭３８−３２３４３号公報、特公昭４３
−１３５１９号公報）等が使用できるとしている。The first two documents published by Metcalfe (KA Metcalfe, J. Sci. Instr.
nm. , 32, 74 (1955) and ibid. , 3
No. 3,194 (1956)), there are many organic or inorganic pigments including carbon black and magnesium oxide as liquid developer pigments, and gasoline as a carrier liquid.
It is described that kerosene, carbon tetrachloride and the like can be used. Also, in the early patent publication of Metcalfe, a halogenated hydrocarbon (Japanese Patent Publication No.
-5511), polysiloxane (Japanese Patent Publication No. 36-1)
No. 4872), a mixed solution of ligroin and these petroleum hydrocarbons (JP-B-38-32343, JP-B-43)
No. -13519) can be used.
【０００６】トナーの製造法に関する特許公報の中にも
キャリア液に関する多くの記載があり、代表的なものに
は、特公昭４０−１９１８６号公報、特公昭４５−１４
５４５号公報、特公昭５６−９１８９号公報等がある。
これら文献に記載されているキャリア液（重合時の分散
媒を兼ねる場合もある）としては、ベンゼン、トルエ
ン、キシレン等の芳香族炭化水素、エステル類、アルコ
ール類、ｎ−ヘキサン、１−ドデカン、アイソパーＨ、
Ｇ、Ｌ、Ｖ（エクソン化学社製）等の脂肪族炭化水素な
どが使用できるとしている。また、特開平５−２８１７
８８号公報、特開平６−１７５４１４号公報等は無臭溶
剤を用いることが提案されているが、トナーの耐久性な
どに問題がある。There are many descriptions of carrier liquids in patent publications relating to toner production methods, representative examples of which are JP-B-40-19186 and JP-B-45-14.
545 and JP-B-56-9189.
Examples of carrier liquids (which may also serve as a dispersion medium during polymerization) described in these documents include aromatic hydrocarbons such as benzene, toluene, and xylene, esters, alcohols, n-hexane, 1-dodecane, Isopar H,
It is stated that aliphatic hydrocarbons such as G, L, and V (manufactured by Exxon Chemical Co.) can be used. Also, Japanese Unexamined Patent Publication No.
No. 88, JP-A-6-175414 and the like propose the use of an odorless solvent, but have a problem in the durability of the toner.
【０００７】また、従来提案されているキャリア液は、
ほとんどが蒸気圧の高い有機溶媒であるために、ｉ）定
着時等に排出されるキャリア液蒸気が環境汚染を引き起
こしやすい、ii）引火しやすい、といった問題を抱えて
いる。これらの問題点に対して、例えば、キャリア液の
蒸気圧を低下させるために、キャリア液に蒸気圧の低い
炭化水素系の石油溶媒を用いることが考えられる。しか
し、蒸気圧を低くしようとして炭化水素の分子量を増加
させると、一般にキャリア液の粘度が上昇し、現像速度
に影響を及ぼす結果となる。更に、キャリア液の融点が
室温近傍まで上昇し、現像液として使用するには常時加
熱が必要となり、省エネルギー、熱汚染、現像液の劣化
等の点で好ましくない。[0007] Further, conventionally proposed carrier liquids include:
Since most are organic solvents having a high vapor pressure, there are problems that i) the carrier liquid vapor discharged at the time of fixing or the like easily causes environmental pollution, and ii) easily ignites. To solve these problems, for example, it is conceivable to use a hydrocarbon-based petroleum solvent having a low vapor pressure for the carrier liquid in order to reduce the vapor pressure of the carrier liquid. However, increasing the molecular weight of the hydrocarbon in an attempt to lower the vapor pressure generally increases the viscosity of the carrier liquid, resulting in an adverse effect on development speed. Further, the melting point of the carrier liquid rises to around room temperature, and heating is always required for use as a developer, which is not preferable in terms of energy saving, heat contamination, deterioration of the developer, and the like.
【０００８】また、特開昭５１−８９４２８号公報に
は、キャリア液として電気抵抗率が１０9Ω・ｃｍ以上
で誘電率が３．０以下の炭化水素溶液が提案されてい
る。従来キャリア液として提案されているものは高い電
気抵抗率と低い誘電率をもった無極性の炭化水素溶液が
主流をなす。キャリア液の電気抵抗率が適度な値より低
いと感光体の潜像を破壊したり、また、現像及び転写部
でのバイアスリーク等が発生し、良好な画像が得られな
いことが経験的に知られている。その上、これらの高電
気抵抗率、低誘電率の無極性キャリア液を含有する現像
剤は、トナーへの電荷付与性及びその経時的な安定性に
関して必ずしも満足な結果が得られていない。すなわ
ち、経時的にトナーの電荷量が減少してきたり、逆極性
トナー量が増加してくるという問題点もあった。このよ
うに、従来提案されている液体現像剤用のキャリア液と
して満足するものは未だ得られていないのが実情であ
る。Japanese Patent Application Laid-Open No. 51-89428 proposes a hydrocarbon solution having an electric resistivity of 10 9 Ω · cm or more and a dielectric constant of 3.0 or less as a carrier liquid. Conventionally, as a carrier liquid, a nonpolar hydrocarbon solution having a high electric resistivity and a low dielectric constant is mainly used. If the electric resistivity of the carrier liquid is lower than an appropriate value, the latent image on the photoreceptor may be destroyed, or a bias leak or the like may occur in the developing and transferring sections, and it is empirically found that a good image cannot be obtained. Are known. In addition, the developer containing these non-polar carrier liquids having a high electric resistivity and a low dielectric constant does not always provide satisfactory results with respect to the charge imparting property to the toner and the stability over time. That is, there has been a problem that the charge amount of the toner decreases over time and the toner amount of the opposite polarity increases. As described above, the fact that a carrier liquid for a liquid developer that has been conventionally proposed is satisfactory has not yet been obtained.
【０００９】[0009]
【発明が解決しようとする課題】本発明の目的は、上述
の問題点あるいは不都合な点をもたらすことなく、液体
現像剤を用いた複写機、プリンタから排出されるキャリ
ア液の量を低減し、複写物から放出される溶剤量を低減
することができ、しかも、火災の危険性が少なく、且つ
帯電特性及び帯電安定性が良好なキャリア液を用い、優
れた高画質を得る液体現像剤を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to reduce the amount of carrier liquid discharged from a copying machine or printer using a liquid developer without causing the above-mentioned problems or disadvantages. Provided is a liquid developer that can reduce the amount of solvent released from a copy, has a low risk of fire, and uses a carrier liquid having good charging characteristics and charging stability to obtain excellent high image quality. Is to do.
【００１０】[0010]
【課題を解決するための手段】本発明はコピー時に排出
される溶剤量を低減し、優れた高画質を得るためにキャ
リア液体を研究したところ、植物油、変性植物油を用い
た電子写真液体トナーを発明するに至った。即ち、上記
課題は、本発明の（１）「着色剤、樹脂、キャリア液を
少なくとも含む電子写真液体現像剤において、キャリア
液が植物油又はその変性油を含むことを特徴とする電子
写真液体現像剤」、（２）「キャリア液全体における植
物油又はその変性油の含有量が５０〜１００ｗｔ％であ
ることを特徴とする前記（１）項に記載の電子写真液体
現像剤」、（３）「前記植物油が、精製されたものであ
ることを特徴とする前記（１）又は（２）項に記載の電
子写真液体現像剤」、（４）「キャリア液として脂肪族
炭化水素、シリコーンオイル、フッ素溶媒、エーテル化
合物、ハロゲン化炭化水素を２０〜９５ｗｔ％混合して
用いることを特徴とする前記（１）乃至（３）項のうち
何れか１に記載の電子写真液体現像剤」、（５）「前記
植物油が、なたね油、ひまし油、やし油、カノーラ油、
ひまわり油、綿実油、大豆白絞油、落花生油、きり油、
ベニバナ油、あまに油、脂肪酸エステル類であるキャリ
アを用いることを特徴とする前記（１）乃至（４）項の
うち何れか１に記載の電子写真液体現像剤」、（６）
「前記植物油が、アルカリ精製、マンガン、亜鉛、チタ
ン、ジルコニウム、ニッケル、鉄、アルミニウム、銅等
の金属を含む金属石けん、重合エステル化剤としての有
機チタン、例えばテトラステアロキシチタン、テトラ−
ｎ−ブトキシチタン、テトラ−ｉ−プロポキシチタン、
テトラキス（２−エトルヘキリキシ）チタン、アントラ
キノン、ヒドロキノン、メトキシヒドロキノン等により
変性したものであることを特徴とする前記（１）乃至
（５）項のうち何れか１に記載の電子写真液体現像
剤」、（７）「前記植物油が、植物油を加熱重合させる
ことにより、又は着色剤、樹脂、植物油を加熱混合分散
させワニス状とすることにより変性油としたものである
ことを特徴とする前記（１）乃至（６）項のうち何れか
１に記載の電子写真液体現像剤」によって達成される。According to the present invention, a carrier liquid has been studied in order to reduce the amount of solvent discharged at the time of copying and obtain excellent image quality. As a result, an electrophotographic liquid toner using vegetable oil or modified vegetable oil has been developed. Invented. That is, the object of the present invention is to provide (1) an electrophotographic liquid developer containing at least a colorant, a resin, and a carrier liquid, wherein the carrier liquid contains a vegetable oil or a modified oil thereof. (2) "the electrophotographic liquid developer according to the above (1), wherein the content of the vegetable oil or its modified oil in the entire carrier liquid is 50 to 100 wt%"; The vegetable oil is refined, and the electrophotographic liquid developer according to the above (1) or (2) ”, (4)“ aliphatic hydrocarbon, silicone oil, fluorine solvent as a carrier liquid ” , An ether compound, and a halogenated hydrocarbon in a proportion of 20 to 95 wt%, and wherein the electrophotographic liquid developer according to any one of the above items (1) to (3) is used. The vegetable oil , Rapeseed oil, castor oil, coconut oil, canola oil,
Sunflower oil, cottonseed oil, white soybean oil, peanut oil, cutting oil,
(6) The electrophotographic liquid developer according to any one of (1) to (4), wherein a carrier that is a safflower oil, linseed oil, or a fatty acid ester is used.
"The vegetable oil is an alkali refined metal soap containing metals such as manganese, zinc, titanium, zirconium, nickel, iron, aluminum, and copper, and organic titanium as a polymerization esterifying agent, for example, tetrastearoxytitanium, tetra-
n-butoxytitanium, tetra-i-propoxytitanium,
(1) The electrophotographic liquid developer according to any one of (1) to (5), wherein the electrophotographic liquid developer is modified with tetrakis (2-ethoxyhexyl) titanium, anthraquinone, hydroquinone, methoxyhydroquinone, or the like. (7) The above-mentioned (1), wherein the vegetable oil is a modified oil obtained by heating and polymerizing vegetable oil, or by heating, mixing and dispersing a coloring agent, a resin, and vegetable oil to form a varnish. To the electrophotographic liquid developer according to any one of the above items (6) to (6).
【００１１】これらの植物油は分子内に親水性部位と親
油性部位を有するため着色剤を分散する効果が高く、ま
た適当な粘性を有するため、液体トナーを微粒子に分散
することが可能である。また、電子写真液体トナーに必
要な電気絶縁性も植物油を各種変性することにより向上
させることもできた。[0011] These vegetable oils have a hydrophilic part and a lipophilic part in the molecule, so that they have a high effect of dispersing the colorant, and have an appropriate viscosity, so that the liquid toner can be dispersed in fine particles. Further, the electrical insulation required for the electrophotographic liquid toner could also be improved by variously modifying the vegetable oil.
【００１２】以下、本発明を更に詳しく説明する。本発
明のキャリア液体としては、主に植物油が挙げられる。
植物油としては、大豆油、カノーラ油、ヒマワリ油、サ
フラワー油、綿実油、大豆白絞油、なたね油、やし油、
落花生油、きり油、ベニバナ油、あまに油等が挙げられ
る。また、植物油単独では臭気が若干あるものを変性し
て無臭化することや、電気抵抗を高めること、植物油の
色を透明にすること、粘度を調整すること等により、電
子写真液体トナーのキャリアとして更に優れたものにす
ることができる。具体的な製造例を以下に示す。Hereinafter, the present invention will be described in more detail. The carrier liquid of the present invention mainly includes vegetable oil.
Vegetable oils include soybean oil, canola oil, sunflower oil, safflower oil, cottonseed oil, white soybean oil, rapeseed oil, coconut oil,
Peanut oil, cutting oil, safflower oil, linseed oil, and the like. In addition, vegetable oil alone can be used as a carrier of an electrophotographic liquid toner by modifying a substance having a slight odor to deodorize it, increasing electric resistance, making the color of vegetable oil transparent, adjusting the viscosity, and the like. It can be even better. A specific production example is shown below.
【００１３】製造例１ ３ｗｔ％ＫＯＨ水溶液５００ｇを四ツ口フラスコに採
り、６０℃に加熱、撹拌した。その中にサフラワー油３
００ｇを１時間にわたり滴下した。更に４時間撹拌し
た。分液漏斗でＫＯＨ水溶液を分離した。更に水で３回
減圧蒸留を行ない、サフラワー油を精製した。Production Example 1 500 g of a 3 wt% KOH aqueous solution was placed in a four-necked flask, heated to 60 ° C., and stirred. Safflower oil 3 in it
00 g was added dropwise over 1 hour. The mixture was further stirred for 4 hours. The KOH aqueous solution was separated with a separating funnel. Further, vacuum distillation was performed three times with water to purify safflower oil.
【００１４】製造例２ 製造例１と同様に、大豆油をアルカリ精製した。 製造例３ アルカリ精製した大豆油を５００ｇ四ツ口フラスコに採
り、Ｎ2雰囲気下、２５０℃で４時間加熱したところ、
粘度２８ｍｐａ・ｓｅｃの変性大豆油を得た。Production Example 2 In the same manner as in Production Example 1, soybean oil was alkali-refined. Production Example 3 500 g of alkali-purified soybean oil was placed in a four-necked flask and heated at 250 ° C. for 4 hours under an N 2 atmosphere.
A modified soybean oil having a viscosity of 28 mpa · sec was obtained.
【００１５】製造例４ 四ツ口フラスコになたね油５００ｇを採り、アントラキ
ノン５０ｇを加えて、Ｎ2雰囲気下、３００℃で４時間
撹拌し、粘度５２ｍｐａ・ｓｅｃの変性なたね油を得
た。Production Example 4 500 g of rapeseed oil was placed in a four-necked flask, 50 g of anthraquinone was added, and the mixture was stirred at 300 ° C. for 4 hours under an N 2 atmosphere to obtain a modified rapeseed oil having a viscosity of 52 mpa · sec.
【００１６】製造例５ 製造例４と同様に、四ツ口フラスコに大豆油を５００
ｇ、ナフテン酸マンガン１０ｇを加え、１２０℃で８時
間反応させ、１２０ｍｐａ・ｓｅｃの粘度を有する変性
大豆油を得た。Production Example 5 As in Production Example 4, 500 soybean oil was placed in a four-necked flask.
g and 10 g of manganese naphthenate were added and reacted at 120 ° C. for 8 hours to obtain a modified soybean oil having a viscosity of 120 mpa · sec.
【００１７】製造例６ 製造例４と同様に、四ツ口フラスコにあまに油を５００
ｇ、テトラオクリルチタネート３０ｇを加え、１００℃
で８時間反応させ、８５ｍｐａ・ｓｅｃの粘度を有する
変性あまに油を得た。Production Example 6 In the same manner as in Production Example 4, 500 l
g, and 30 g of tetraacrylic titanate.
For 8 hours to obtain a modified linseed oil having a viscosity of 85 mpa · sec.
【００１８】本発明に用いられる着色剤の例としては、
公知の有機又は無機顔料を用いることができる。例えば
Ｃ．Ｉ．ピグメントレッド４８：１、５７：１、１２
２、１７、Ｃ．Ｉ．ピグメントイエロー９７、１２、
Ｃ．Ｉ．ピグメントブルー１５：１、１５：３、ローズ
ベンガルＣ．Ｉ．Ｎｏ４５４３２、ニグロシン、カーボ
ンブラック、これらの混合物等が挙げられる。樹脂とし
ては、アクリル樹脂、ポリオレフィン樹脂、天然樹脂、
アルキッド樹脂、フェノール樹脂等を用いることができ
る。Examples of the coloring agent used in the present invention include:
Known organic or inorganic pigments can be used. For example, C.I. I. Pigment Red 48: 1, 57: 1, 12
2, 17, C.I. I. Pigment Yellow 97, 12,
C. I. Pigment Blue 15: 1, 15: 3, Rose Bengal C.I. I. No. 45432, nigrosine, carbon black, and mixtures thereof. Acrylic resin, polyolefin resin, natural resin,
An alkyd resin, a phenol resin or the like can be used.
【００１９】液体トナーの構成は顔料／樹脂／分散媒
（キャリア）が約５〜２５／５〜５０／５０〜９０重量
部が適当である。必要に応じて帯電制御剤を加えること
ができる。電荷制御剤としては、レシチン、オクタン酸
ジルコニウム、アルキルスクシンイミド、第４級アンモ
ニウム塩等が挙げられ、添加量は０．００１〜１０ｗｔ
部が一般的である。液体トナーの製造方法としては、ア
トライター、サンドミル、ボールミル、振動ミル等で、
５〜２４時間分散し、粒径０．１〜２μｍくらいの平均
粒径とする。The constitution of the liquid toner is suitably about 5 to 25/5 to 50/50 to 90 parts by weight of pigment / resin / dispersion medium (carrier). If necessary, a charge control agent can be added. Examples of the charge control agent include lecithin, zirconium octoate, alkyl succinimide, and quaternary ammonium salt, and the added amount is 0.001 to 10 wt.
Department is common. As a method for producing a liquid toner, an attritor, a sand mill, a ball mill, a vibration mill, etc.
Disperse for 5 to 24 hours to obtain an average particle size of about 0.1 to 2 μm.
【００２０】[0020]
【実施例】以下、実施例により本発明を具体的に説明す
る。 実施例１ アトライターにカーボン（三菱社製、＃４４）１００ｗ
ｔ部、なたね油３００ｗｔ部を採り、３０分プレ分散
後、アクリル樹脂１５０ｗｔ部、レシチン５ｗｔ部を加
えて、２時間分散し、液体トナーを製造した。平均粒径
が１．２μｍ、粘度が８５０ｍｐａ・ｓｅｃであった。
この液体トナー５０ｇをなたね油１０００ｇに分散し、
現像剤とした。この現像剤を用いてｓａｖｉｎ ９０４
０ｉでコピーしたところ、画像濃度１．１８、解像度
５．６本／ｍｍ、定着性７５％のコピーを得ることがで
きた。The present invention will be described below in detail with reference to examples. Example 1 100 watts of carbon (Mitsubishi Corporation, # 44) was used for the attritor.
t parts and 300 parts by weight of rapeseed oil were taken, and after predispersion for 30 minutes, 150 parts by weight of an acrylic resin and 5 parts by weight of lecithin were added and dispersed for 2 hours to produce a liquid toner. The average particle size was 1.2 μm, and the viscosity was 850 mpa · sec.
50 g of this liquid toner is dispersed in 1000 g of rapeseed oil,
A developer was used. Savin 904 using this developer
As a result of copying at 0i, a copy having an image density of 1.18, a resolution of 5.6 lines / mm, and a fixing property of 75% was obtained.
【００２１】実施例２ 実施例１のなたね油の代わりに製造例４の変性なたね油
を用いた他は、実施例１と同様にテストを行なった。Example 2 A test was conducted in the same manner as in Example 1 except that the modified rapeseed oil of Production Example 4 was used instead of the rapeseed oil of Example 1.
【００２２】実施例３ 実施例１のなたね油の代わりにサフラワー油を用いた他
は、実施例１と同様にテストを行なった。Example 3 A test was conducted in the same manner as in Example 1 except that safflower oil was used instead of the rapeseed oil.
【００２３】実施例４ 実施例１のなたね油の代わりに製造例１の変性サフラワ
ー油を用いた他は、実施例１と同様にテストを行なっ
た。Example 4 A test was conducted in the same manner as in Example 1 except that the modified safflower oil of Production Example 1 was used instead of the rapeseed oil of Example 1.
【００２４】実施例５ 実施例１のなたね油の代わりに大豆油を用いた他は、実
施例１と同様にテストを行なった。Example 5 A test was conducted in the same manner as in Example 1 except that soybean oil was used instead of the rapeseed oil.
【００２５】実施例６ 実施例１のなたね油の代わりに製造例２のアルカリ精製
大豆油を用いた他は、実施例１と同様にテストを行なっ
た。Example 6 A test was carried out in the same manner as in Example 1 except that the alkali-refined soybean oil of Production Example 2 was used instead of the rapeseed oil of Example 1.
【００２６】実施例７ 実施例１のなたね油の代わりに製造例３の変性大豆油を
用いた他は、実施例１と同様にテストを行なった。Example 7 A test was conducted in the same manner as in Example 1 except that the modified soybean oil of Production Example 3 was used instead of the rapeseed oil of Example 1.
【００２７】実施例８ 実施例１のなたね油の代わりに製造例５の変性大豆油を
用いた他は、実施例１と同様にテストを行なった。Example 8 A test was conducted in the same manner as in Example 1 except that the modified soybean oil of Production Example 5 was used instead of the rapeseed oil of Example 1.
【００２８】実施例９ 実施例１のなたね油の代わりにあまに油を用いた他は、
実施例１と同様にテストを行なった。Example 9 Except that oil was used instead of rapeseed oil in Example 1,
A test was performed in the same manner as in Example 1.
【００２９】実施例１０ 実施例１のなたね油の代わりにあまに油を用い、２００
℃で６時間反応させワニス状にした他は、実施例１と同
様にテストを行なった。以上の結果を表１にまとめた。Example 10 Instead of rapeseed oil in Example 1, oil was used instead of rapeseed oil.
A test was conducted in the same manner as in Example 1 except that the reaction was carried out at 6 ° C. for 6 hours to form a varnish. Table 1 summarizes the above results.
【００３０】[0030]
【表１】 [Table 1]
【００３１】植物オイル単独より、植物オイルを精製、
変性オイルにしたほうが臭気も少なく、平均粒径は小さ
く、分散性、粘度は上昇した。また、画像濃度、解像
力、定着性も向上した。Purification of vegetable oil from vegetable oil alone,
The modified oil had less odor, a smaller average particle size, and increased dispersibility and viscosity. Further, the image density, the resolving power, and the fixability were also improved.
【００３２】[0032]
【発明の効果】以上、詳細且つ具体的な説明より明らか
なように、植物油を液体トナーのキャリア（分散媒）に
用いることにより、液体トナーの粒径が小さく、無臭
で、画像濃度、解像度、定着性を上げる効果が認められ
る。また、本発明のように植物油を更に精製、変性オイ
ルにすることにより、更にトナー粒子の分散性の向上、
無臭化が可能になった。また、画像濃度、解像度、定着
性にも効果のあることが判明した。As is apparent from the detailed and specific description above, by using vegetable oil as a carrier (dispersion medium) for a liquid toner, the particle size of the liquid toner is small, odorless, image density, resolution, The effect of improving the fixing property is recognized. Further, by further refining the vegetable oil as a modified oil as in the present invention, further improving the dispersibility of the toner particles,
Deodorization became possible. It was also found that the image density, resolution and fixability were also effective.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石川 愛子 東京都大田区中馬込１丁目３番６号 株式 会社リコー内 Ｆターム(参考） 2H069 BA00 BA01 BA02 CA14 CA16 DA08 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Aiko Ishikawa 1-3-6 Nakamagome, Ota-ku, Tokyo F-term in Ricoh Co., Ltd. (Reference) 2H069 BA00 BA01 BA02 CA14 CA16 DA08
Claims (7)
含む電子写真液体現像剤において、キャリア液が植物油
又はその変性油を含むことを特徴とする電子写真液体現
像剤。1. An electrophotographic liquid developer containing at least a colorant, a resin, and a carrier liquid, wherein the carrier liquid contains a vegetable oil or a modified oil thereof.
変性油の含有量が５０〜１００ｗｔ％であることを特徴
とする請求項１に記載の電子写真液体現像剤。2. The electrophotographic liquid developer according to claim 1, wherein the content of the vegetable oil or its modified oil in the entire carrier liquid is 50 to 100% by weight.
とを特徴とする請求項１又は２に記載の電子写真液体現
像剤。3. The electrophotographic liquid developer according to claim 1, wherein the vegetable oil is refined.
コーンオイル、フッ素溶媒、エーテル化合物、ハロゲン
化炭化水素を２０〜９５ｗｔ％混合して用いることを特
徴とする請求項１乃至３のうち何れか１に記載の電子写
真液体現像剤。4. The method according to claim 1, wherein an aliphatic hydrocarbon, a silicone oil, a fluorine solvent, an ether compound and a halogenated hydrocarbon are mixed and used as a carrier liquid in an amount of 20 to 95% by weight. 2. The electrophotographic liquid developer according to item 1.
し油、カノーラ油、ひまわり油、綿実油、大豆白絞油、
落花生油、きり油、ベニバナ油、あまに油、脂肪酸エス
テル類であるキャリアを用いることを特徴とする請求項
１乃至４のうち何れか１に記載の電子写真液体現像剤。5. The vegetable oil, wherein the vegetable oil is rapeseed oil, castor oil, coconut oil, canola oil, sunflower oil, cottonseed oil, soybean white oil,
The electrophotographic liquid developer according to any one of claims 1 to 4, wherein a carrier that is a peanut oil, a cutting oil, a safflower oil, a linseed oil, or a fatty acid ester is used.
ン、亜鉛、チタン、ジルコニウム、ニッケル、鉄、アル
ミニウム、銅等の金属を含む金属石けん、アントラキノ
ン、ヒドロキノン、メトキシヒドロキノン等により変性
した変性油であることを特徴とする請求項１乃至５のう
ち何れか１に記載の電子写真液体現像剤。6. The vegetable oil is a modified oil modified by alkali refining, metal soap containing metals such as manganese, zinc, titanium, zirconium, nickel, iron, aluminum and copper, anthraquinone, hydroquinone, methoxyhydroquinone and the like. The electrophotographic liquid developer according to any one of claims 1 to 5, wherein:
ことにより、又は着色剤、樹脂、植物油を加熱混合分散
させワニス状とすることにより変性油としたものである
ことを特徴とする請求項１乃至６のうち何れか１に記載
の電子写真液体現像剤。7. The modified oil according to claim 1, wherein the vegetable oil is modified by heating and polymerizing the vegetable oil or by heating and mixing and dispersing a colorant, a resin and a vegetable oil to form a varnish. 7. The electrophotographic liquid developer according to any one of items 1 to 6,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19648698A JP3731134B2 (en) | 1998-06-29 | 1998-06-29 | Electrophotographic developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19648698A JP3731134B2 (en) | 1998-06-29 | 1998-06-29 | Electrophotographic developer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000019787A true JP2000019787A (en) | 2000-01-21 |
| JP3731134B2 JP3731134B2 (en) | 2006-01-05 |
Family
ID=16358591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19648698A Expired - Fee Related JP3731134B2 (en) | 1998-06-29 | 1998-06-29 | Electrophotographic developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3731134B2 (en) |
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