JP3635304B2 - Fixing method - Google Patents

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JP3635304B2
JP3635304B2 JP33676698A JP33676698A JP3635304B2 JP 3635304 B2 JP3635304 B2 JP 3635304B2 JP 33676698 A JP33676698 A JP 33676698A JP 33676698 A JP33676698 A JP 33676698A JP 3635304 B2 JP3635304 B2 JP 3635304B2
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ozone
fixing method
fixing
image
resin
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JP2000162903A (en
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剛 浅見
一男 津布子
愛子 石川
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Ricoh Co Ltd
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Ricoh Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は電子写真、静電記録、印刷インキ等に用いられる定着方法に関する。
【0002】
【従来の技術】
電子写真用現像剤は、乾式現像剤、液体現像剤に大別されるが、液体現像剤は、そのトナー粒径が小さいことから鮮明な画像が得られる有利さがある。液体現像剤は、一般には結着樹脂と着色剤と電荷制御剤とを高抵抗の非水溶媒中に分散し、粒径0.1〜2.0μm程度のトナー粒子を作ることによって製造されている。紙等の転写物への定着は、熱ロールによる定着、圧力による定着、熱風による定着、フラッシュ光による定着、紙の裏面から熱板による定着等いろいろな定着法が知られているが、液体現像剤の場合は、熱ロール、熱風、紙の裏面からの熱による定着あるいはこれらを組み合わせたものが一般的である。その理由は、液体現像剤の溶媒として沸点200℃以下の脂肪族炭化水素等が多く用いられ、熱により溶剤を蒸発させることにより、定着させるシステムが多いからである。
しかし、この場合、定着時に溶剤蒸気が大気中に放出され、環境上好ましくない場合が多く、また、定着に熱を使用するため、消費電力も多く、電源を入れてからスタートさせるまでの待機時間もかかった。その対策として、溶剤蒸気を発生させないために、特開平9−208873号公報には紫外線硬化を利用したものが記載されているが、機械が大型になる等の問題があり、また、特開平8−272153号公報にはヨウ素化130以上の油脂を使用し、空気により酸化重合し、定着する方法が記載されているが、定着に時間がかかる等の問題があった。
【0003】
【発明が解決しようとする課題】
本発明の目的は、短時間で定着ができ、しかも画像濃度の高い定着方法を提供することである。
【0004】
【課題を解決するための手段】
本発明においては、常温で液状の画像形成媒体の定着時間を向上させる方法として、未定着画像にオゾンを吹き付けることで定着速度が速くなることを見い出した。これは、オゾンにより未定着画像中に存在している溶媒の酸化反応が急激に進行するためと考えられる。
本発明に使用するオゾンは0.02ppm〜1ppmが好ましい。0.02ppm以下では酸化能力が弱く、オゾンを吹き付けた効果が弱い。また、1ppm以上では酸化重合に寄与しなかったオゾンが残る場合があり、健康上問題がある。酸化重合に使用するオゾンは、電子写真画像形成装置内にオゾン発生機を組み込んでもよいし、オゾンタンクを授け、そこから供給してもよい。
【0005】
また、従来の電子写真装置の場合は、感光体を帯電させるとき、帯電チャージャー等に電圧をかけるが、このとき空気が酸化されオゾンが発生する。オゾンは高濃度では人体に悪影響を与えるため、装置内にオゾンフィルターを設置し、オゾンを除去している。
本発明では、かかる害をもたらすオゾンを利用する目的のため、感光体を帯電させるときに発生するオゾンを回収し、定着部に送り、溶媒の酸化重合に使用する。この場合には、オゾン発生器、オゾンタンクは必要なく、オゾンフィルターも不要となる等の利点がある。
【0006】
本発明の画像定着方法は、常温で液状の画像形成媒体であれば、電子写真用液体現像剤のみならず、インクジェットや印刷技術や塗料等にも応用することが可能である。
【0007】
以下、本発明の定着方法に用いる常温で液状の画像形成媒体について説明するが、便宜上電子写真用液体現像剤の例を挙げて説明していく。
本発明で用いる電子写真用液体現像剤は、結着樹脂と着色剤を主成分とし、高絶縁性で低誘電率の非水溶媒中に分散されている。その中で、特に、非水溶媒の少なくとも一部が電気抵抗109Ω・cm以上で、誘電率3.5以下の2つ以上の不飽和結合を持った油脂であれば、オゾンを吹き付けた際に、定着時間を向上させることができる。また、本発明は溶媒中の不飽和結合の化学変化により定着させるため、従来の液体現像剤のように定着時に溶剤蒸気の飛散がなく、クリーンである。また、熱を使用せず定着できるため、省エネルギーであり、待機時間も必要としない等の特徴がある。
【0008】
本発明に使用される2つ以上の不飽和結合を持った油脂の例としては、アマニ油、大豆油、ナタネ油、綿実油、コメ油、トウモロコシ油、ゴマ油、落花生油、ヒマワリ油、サフラワー油、グリセリンとのエステル、ヒマシ油等の天然油脂や、オレイン酸、リノール酸、リノレン酸、エライドリノレン酸、アラキドン酸等の不飽和脂肪酸が挙げられるが、これらに限定されるものではなく合成油であってもかまわない。
【0009】
本発明においては、特に溶媒に共役二重結合を持った油脂を使用した場合、反応が速く、定着に有利である。共役二重結合を持った油脂の例としては、キリ油、プソイドエレオステアリン酸、α−エレオステアリン酸、β−エレオステアリン酸等の共役不飽和脂肪酸とグリセリンとのエステル、日清製油製オリエスSB等が挙げられる。
【0010】
また、液体現像剤中に脂肪酸金属塩又はナフテン酸金属塩を含有させておくと、不飽和結合の反応を促進させる触媒として機能するため、酸化重合反応が速く進み、より短時間で定着させることができる。
脂肪酸金属塩の含有量は、液体現像剤の0.1〜10%程度がよく、0.1%以下では、反応促進効果に乏しく、10%以上では、現像剤の電気特性に悪影響を与えたり、現像液の保存性に問題が発生したりする。
【0011】
本発明に使用される脂肪酸金属塩又はナフテン酸の金属塩の例としては、ナフテン酸コバルト、ナフテン酸ニッケル、ナフテン酸銅、ステアリン酸鉄、ステアリン酸亜鉛、ステアリン酸ジルコニウム等が挙げられる。
【0012】
本発明の液体現像剤に使用される色素は、従来公知の顔料、染料から適切に選択することができる。例えば、有機顔料又は染料としてはフタロシアニン系、アゾ系、アントラキノン系、ペリレン系、インジゴ・チオンジゴ系、キナクリドン系、イソインドリン系、アニリンブラック系、カーボンブラック系等の顔料が挙げられ、無機顔料としては、酸化チタン系、酸化鉄系、焼成顔料系、紺青、金属粉顔料、体質顔料等が挙げられる。
【0013】
特に、これらの色素をフラッシング処理を行なった場合は、画像面で優れた液体現像剤が得られる。フラッシング処理とは、色素を水に溶かした含水液に、更に樹脂分散媒を加え、フラッシャーと呼ばれるニーダー中でよく混合し、顔料のまわりに存在する水を後から添加される樹脂分散媒によって置換する処理をいう。この操作により取り出される水を排出し、樹脂溶液中に顔料が分散された状態とし、乾燥させて溶剤を除去し、得られた塊を粉砕することにより着色剤の粉末が得られる。
【0014】
本発明のフラッシング処理で使用する樹脂の例としては、サンワックスE200、サンワックスE250P、サンワックス131−P(三洋化成社製)等のポリエチレン樹脂、ビスコール500P、ビスコール600P(三洋化成社製)等のポリプロピレン樹脂、デンカビニルSS−100、デンカビニルSS−130、デンカビニルDSS−13(電気化学工業社製)等の塩化ビニル、パラフィンワックス、天然ろう等が挙げられる。
【0015】
本発明に使用される結着樹脂は、アクリル酸及びメタクリル酸エステルの重合ポリマー、ロジン及びロジン変性樹脂、エポキシ樹脂、シリコーン樹脂、スチレン樹脂等が使用できる。特に、分子量3000〜200,000のアクリル系樹脂を使用した場合は、画像面、定着性等で優れた液体現像剤が得られる。分子量が3000以下では、着色剤を結着させる能力に乏しく、画像濃度、定着性が悪くなり、200,000以上では、高粘性になりすぎて製造時に分散不良を起こす場合がある。
【0016】
液体現像剤の粘度は5000mPa・s以下が望ましく、これ以上の場合は、紙等の転写体への浸透性が悪くなり、定着時間が遅くなる。
【0017】
【実施例】
以下に、本発明を実施例を挙げて具体的に説明するが、本発明はこれらの実施例に限定されるものではない。なお、ここでの「部」は重量部である。
実施例1

Figure 0003635304
反応釜に重合溶媒としてアイソパーHを500部とり、90℃に加温した。上記組成物を完全に溶解後、3時間にわたり反応釜に滴下した。滴下終了後90℃で更に6時間重合した。これにメチルメタクリレート(MMA)8部を1時間にわたり滴下して、粘度200mPa・s、分子量80,000の結着樹脂Aを得た。
Figure 0003635304
をボールミルに入れ、24時間分散し、トナーAを得た。
これを更に100g/リットルの希釈率でアマニ油で希釈し、リコー製湿式複写機FT−500iの定着部分をはずして未定着画像を得た。この画像に濃度0.1ppmのオゾンを吹きかけた。
【0018】
比較例として、オゾンをかけずに空気中に放置し、指で擦っても像が乱れなくなるまでの時間(セット時間)を比較したところ、表1に示すようにオゾンを吹きかけた場合の方がはるかに短時間でセットすることができた。
【0019】
【表1】
Figure 0003635304
【0020】
セット時間とは、画像表面を指で擦っても像が乱れなくなるまでの時間をいい、画像濃度はX−Rite938で測定、粘度はB型粘度計60rpm(25℃)で測定した。
【0021】
比較例1
アマニ油の代わりに、不飽和結合が1つの主成分がオレイン酸トリグリセライドの椿油を使用した以外は、実施例1と同様にしてトナーBを試作した。
これを更に100g/リットルの希釈率で椿油で希釈し、リコー製湿式複写機FT−500iの定着部分をはずして未定着画像を得た。この画像に濃度0.1ppmのオゾンを吹きかけた。
実施例1と同様にセット時間を調べたところ、7日以上経過してもセットしなかった。
【0022】
【表2】
Figure 0003635304
【0023】
実施例2
アマニ油の代わりに、共役二重結合を持ったキリ油を使用した以外は、実施例1と同様にしてトナーCを試作した。
これを更に100g/リットルの希釈率でキリ油で希釈し、リコー製湿式複写機FT−500iの定着部分をはずして未定着画像を得た。この画像に濃度0.1ppmのオゾンを吹きかけた。
実施例1と同様にセット時間を調べたところ、セット時間は5時間であった。オゾンを使用しないで空気中に放置しておいた場合は、セット時間は1日であった。
【0024】
【表3】
Figure 0003635304
【0025】
実施例3
図1の装置のように、リコー製湿式複写機FT−500iを改造して帯電チャージャー(7)から発生するオゾンをオゾン収集部(8)で回収して、オゾン送風機(10)により、トナーCを使用して得た未定着画像に吹きかけた。
セット時間は12時間であったが、複写機から発生するオゾンは0.01ppm以下であった。回収装置のない場合は0.05ppmのオゾンが大気中に放出された。また、オゾン発生機は必要なく、装置を簡単にすることができた。なお、オゾン濃度は株式会社ガステック製オゾン検知管No.18で測定した。
【0026】
実施例4
トナーA及びトナーCにナフテン酸コバルトをトナー重量に対して1%添加してトナーD、トナーEを作成した。これをリコー製湿式複写機FT−500iの定着部分をはずして未定着画像を得た。この画像に濃度0.1ppmのオゾンを吹きかけた。その結果、表4に示すようにナフテン酸コバルトを添加しない場合に比べて、セット時間を短くすることができた。
【0027】
【表4】
Figure 0003635304
【0028】
実施例5
Figure 0003635304
をフラッシング処理し、これを実施例3と同様にトナー化し、トナーFを得た。
これを更に100g/リットルの希釈率でキリ油で希釈し、リコー製湿式複写機FT−500iの定着部分をはずして未定着画像を得た。この画像に濃度0.1ppmのオゾンを吹きかけた。
得られた画像の濃度をX−Rite938で測定したところ、表5で示すようにトナーCに比べて良好な結果が得られた。
【0029】
【表5】
Figure 0003635304
【0030】
比較例2
Figure 0003635304
反応釜に重合溶媒としてアイソパーHを700部とり、120℃に加温した。
上記組成物を完全に溶解後、2時間にわたり反応釜に滴下した。滴下終了後110℃で更に3時間重合し、粘度70mPa・s、分子量2500の結着樹脂Sを得た。また、
Figure 0003635304
反応釜に重合溶媒としてアイソパーHを100部とり、90℃に加温した。上記組成物を完全に溶解後、3時間にわたり反応釜に滴下した。滴下終了後90℃で更に3時間重合し、粘度900mPa・s、分子量220,000の結着樹脂Pを得た。
【0031】
結着樹脂S、及びPを実施例1と同様の方法でトナー化し、トナーG及びトナーHを得た。これを実施例1のトナーAと同様に未定着画像を作成し、オゾンにより酸化、定着し、画像濃度、セット時間を調べたところ、表6に示すようにトナーAに比べて劣る結果であった。
【0032】
【表6】
Figure 0003635304
【0033】
実施例6
トナーCにゲル化剤ユーゲルP(BP社製)を3%添加し、増粘させ、粘度5500mPa・sのトナーIを得た。これを実施例3と同様にセット時間を調べたところ、表7に示すように9時間と、トナーCに比べて劣る結果であった。
【0034】
【表7】
Figure 0003635304
【0035】
【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、請求項1の電子写真装置を用いる定着方法においては、オゾンによる化学変化で定着させるため、溶剤を発生させずに、また、熱も使用せず定着できる。また、画像記録媒体が非水溶媒の少なくとも一部が電気抵抗10 9 Ω・cm以上で誘電率3.5以下の2つ以上の不飽和結合を持った油脂を含んでいるために、高速に定着できる。さらにオゾン発生源として該電子写真装置の感光体帯電部で発生するオゾンを利用することから、オゾン発生器、オゾンタンクを必要とせず、人体への悪影響を防止するためのオゾンフィルターも不要である。また、請求項2の定着方法においては、オゾン濃度が0.02〜1.00ppmであるため、効率よく、安全に定着できる。また、請求項3の定着方法においては、使用するオゾンがコロナ放電により発生するオゾンであるため、画像形成装置を小型化でき、画像形成装置から排出されるオゾン量を低減できる。また、請求項定着方法においては、画像形成媒体、少なくともその一部が共役二重結合を持った油脂であるため、高速に定着できる。また、請求項定着方法においては、画像形成媒体、脂肪酸金属塩又はナフテン酸金属塩を含んでいるために、高速に定着できる。また、請求項定着方法においては、画像形成媒体、着色剤が軟化点50℃〜120℃の樹脂でフラッシングされているため、画像濃度の高い画像を得ることができる。また、請求項定着方法においては、画像形成媒体が、結着樹脂が分子量3000〜200,000のアクリル系樹脂であるため、濃度の高い画像を得ることができ、且つ高速に定着できる。また、請求項定着方法においては、画像形成媒体が、粘度が常温(25℃)で5000mPa・s以下であるため、高速に定着できるという極めて優れた効果を奏する。
【図面の簡単な説明】
【図1】本発明における画像形成装置の1例を示した図である。
【符号の説明】
1 感光体
2 給紙トレイ
3 現像タンク
4 現像液送液管
5 現像ローラ
6 スクイズローラ
7 帯電チャージャー
8 帯電部オゾン収集部
9 オゾン送気管
10 オゾン送風機
11 転写チャージャー
12 定着部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to electrophotography, electrostatic recording, fixing how for use in printing inks and the like.
[0002]
[Prior art]
Electrophotographic developers are roughly classified into dry developers and liquid developers, but liquid developers have the advantage that a clear image can be obtained because the toner particle size is small. A liquid developer is generally produced by dispersing toner, a colorant, and a charge control agent in a high-resistance non-aqueous solvent to produce toner particles having a particle size of about 0.1 to 2.0 μm. Yes. Various fixing methods such as fixing with a heat roll, fixing with pressure, fixing with hot air, fixing with flash light, and fixing with a hot plate from the back of the paper are known for fixing to a transfer material such as paper. In the case of an agent, a heat roll, hot air, fixing by heat from the back side of paper, or a combination thereof is generally used. The reason is that aliphatic hydrocarbons having a boiling point of 200 ° C. or less are often used as the solvent for the liquid developer, and there are many systems for fixing by evaporating the solvent with heat.
However, in this case, solvent vapor is released into the atmosphere during fixing, which is often undesirable from the environment, and because heat is used for fixing, it consumes a lot of power and waits until it starts after the power is turned on. It also took. As a countermeasure, in order to prevent the generation of solvent vapor, Japanese Patent Application Laid-Open No. 9-208873 discloses a method using ultraviolet curing, but there are problems such as an increase in the size of the machine. No. -272153 describes a method of using oils and fats having an iodination of 130 or more, oxidative polymerization with air, and fixing. However, there is a problem that fixing takes time.
[0003]
[Problems to be solved by the invention]
An object of the present invention can fix a short time, yet to provide a high image density fixing how.
[0004]
[Means for Solving the Problems]
In the present invention, as a method for improving the fixing time of a liquid image forming medium at room temperature, it has been found that the fixing speed is increased by spraying ozone on an unfixed image. This is presumably because the oxidation reaction of the solvent present in the unfixed image rapidly proceeds due to ozone.
The ozone used in the present invention is preferably 0.02 ppm to 1 ppm. If it is 0.02 ppm or less, the oxidizing ability is weak and the effect of spraying ozone is weak. Moreover, if it is 1 ppm or more, ozone that did not contribute to oxidative polymerization may remain, which is a health problem. The ozone used for the oxidative polymerization may be provided with an ozone generator in the electrophotographic image forming apparatus, or supplied with an ozone tank.
[0005]
In the case of a conventional electrophotographic apparatus, a voltage is applied to a charging charger or the like when charging a photosensitive member. At this time, air is oxidized and ozone is generated. Since ozone has a negative effect on the human body at high concentrations, an ozone filter is installed in the device to remove ozone.
In the present invention, for the purpose of using ozone to bring such harm, the ozone generated when the photosensitive member is charged to recover, sent to the fixing unit, to use for the oxidative polymerization solvent. In this case, there is an advantage that an ozone generator and an ozone tank are not necessary and an ozone filter is not necessary.
[0006]
The image fixing method of the present invention can be applied not only to an electrophotographic liquid developer but also to an inkjet, a printing technique, a paint, and the like as long as the image forming medium is liquid at normal temperature.
[0007]
Hereinafter, an image forming medium that is liquid at room temperature used in the fixing method of the present invention will be described. For convenience, an example of a liquid developer for electrophotography will be described.
The electrophotographic liquid developer used in the present invention contains a binder resin and a colorant as main components and is dispersed in a non-aqueous solvent having a high insulating property and a low dielectric constant. In particular, ozone was sprayed if at least a part of the non-aqueous solvent had an electrical resistance of 10 9 Ω · cm or more and an oil or fat having two or more unsaturated bonds having a dielectric constant of 3.5 or less. In this case, the fixing time can be improved. In addition, since the present invention is fixed by a chemical change of an unsaturated bond in the solvent, the solvent vapor is not scattered at the time of fixing unlike the conventional liquid developer, and it is clean. In addition, since fixing can be performed without using heat, there are features such as energy saving and no waiting time.
[0008]
Examples of fats and oils having two or more unsaturated bonds used in the present invention include linseed oil, soybean oil, rapeseed oil, cottonseed oil, rice oil, corn oil, sesame oil, peanut oil, sunflower oil, safflower oil , Esters with glycerin, natural fats and oils such as castor oil, and unsaturated fatty acids such as oleic acid, linoleic acid, linolenic acid, elide linolenic acid, and arachidonic acid, but are not limited to these. It doesn't matter.
[0009]
In the present invention, when an oil having a conjugated double bond in a solvent is used, the reaction is fast and advantageous for fixing. Examples of fats and oils having conjugated double bonds include esters of glycerin and conjugated unsaturated fatty acids such as drill oil, pseudoeleostearic acid, α-eleostearic acid, β-eleostearic acid, etc. Oil refined Ories SB and the like can be mentioned.
[0010]
In addition, when a fatty acid metal salt or a naphthenic acid metal salt is contained in the liquid developer, it functions as a catalyst for promoting the reaction of unsaturated bonds, so that the oxidative polymerization reaction proceeds rapidly and can be fixed in a shorter time. Can do.
The content of the fatty acid metal salt is preferably about 0.1 to 10% of the liquid developer, and if it is 0.1% or less, the reaction promoting effect is poor, and if it is 10% or more, the electrical characteristics of the developer are adversely affected. Or a problem occurs in the storage stability of the developer.
[0011]
Examples of the fatty acid metal salt or metal salt of naphthenic acid used in the present invention include cobalt naphthenate, nickel naphthenate, copper naphthenate, iron stearate, zinc stearate, zirconium stearate and the like.
[0012]
The dye used for the liquid developer of the present invention can be appropriately selected from conventionally known pigments and dyes. For example, organic pigments or dyes include phthalocyanine-based, azo-based, anthraquinone-based, perylene-based, indigo / thiondigo-based, quinacridone-based, isoindoline-based, aniline black-based, carbon black-based pigments, etc. , Titanium oxide, iron oxide, calcined pigment, bitumen, metal powder pigment, extender, and the like.
[0013]
In particular, when these dyes are subjected to a flushing treatment, a liquid developer excellent in image surface can be obtained. In the flushing process, a resin dispersion medium is further added to a water-containing liquid in which a pigment is dissolved in water, and the mixture is mixed well in a kneader called a flasher, and water existing around the pigment is replaced by a resin dispersion medium added later. The process to do. The water taken out by this operation is discharged, the pigment is dispersed in the resin solution, dried to remove the solvent, and the resulting mass is pulverized to obtain a colorant powder.
[0014]
Examples of the resin used in the flushing treatment of the present invention include polyethylene resins such as Sun Wax E200, Sun Wax E250P, Sun Wax 131-P (manufactured by Sanyo Chemical Co., Ltd.), Biscol 500P, Biscol 600P (manufactured by Sanyo Chemical Co., Ltd.), etc. Polypropylene resin, Denka vinyl SS-100, Denka vinyl SS-130, Denka vinyl DSS-13 (manufactured by Denki Kagaku Kogyo Co., Ltd.), vinyl chloride, paraffin wax, natural wax and the like.
[0015]
As the binder resin used in the present invention, a polymer polymer of acrylic acid and methacrylic acid ester, rosin and rosin-modified resin, epoxy resin, silicone resin, styrene resin and the like can be used. In particular, when an acrylic resin having a molecular weight of 3000 to 200,000 is used, a liquid developer excellent in image surface and fixability can be obtained. When the molecular weight is 3000 or less, the ability to bind the colorant is poor, and the image density and the fixing property are deteriorated. When it is 200,000 or more, the viscosity becomes too high and dispersion may be caused during production.
[0016]
The viscosity of the liquid developer is desirably 5000 mPa · s or less, and if it is more than this, the permeability to a transfer member such as paper is deteriorated and the fixing time is delayed.
[0017]
【Example】
EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The “parts” here are parts by weight.
Example 1
Figure 0003635304
500 parts of Isopar H as a polymerization solvent was placed in a reaction kettle and heated to 90 ° C. After the above composition was completely dissolved, it was dropped into the reaction kettle over 3 hours. After completion of the dropwise addition, polymerization was further performed at 90 ° C. for 6 hours. To this, 8 parts of methyl methacrylate (MMA) was dropped over 1 hour to obtain a binder resin A having a viscosity of 200 mPa · s and a molecular weight of 80,000.
Figure 0003635304
Was placed in a ball mill and dispersed for 24 hours to obtain toner A.
This was further diluted with linseed oil at a dilution rate of 100 g / liter, and the fixing portion of the Ricoh wet copying machine FT-500i was removed to obtain an unfixed image. This image was sprayed with ozone at a concentration of 0.1 ppm.
[0018]
As a comparative example, when the sample was left in the air without applying ozone and the time (set time) until the image was not disturbed by rubbing with a finger was compared, the case where ozone was sprayed as shown in Table 1 It could be set in a much shorter time.
[0019]
[Table 1]
Figure 0003635304
[0020]
The set time is the time until the image is not disturbed even if the image surface is rubbed with a finger. The image density was measured with X-Rite 938, and the viscosity was measured with a B-type viscometer at 60 rpm (25 ° C.).
[0021]
Comparative Example 1
A toner B was produced in the same manner as in Example 1 except that a coconut oil having one unsaturated bond as a main component and triglyceride oleate was used instead of linseed oil.
This was further diluted with cocoon oil at a dilution rate of 100 g / liter, and the fixing portion of the Ricoh wet copying machine FT-500i was removed to obtain an unfixed image. This image was sprayed with ozone at a concentration of 0.1 ppm.
When the set time was examined in the same manner as in Example 1, it was not set even after 7 days or more.
[0022]
[Table 2]
Figure 0003635304
[0023]
Example 2
Toner C was produced in the same manner as in Example 1 except that tung oil having a conjugated double bond was used instead of linseed oil.
This was further diluted with drill oil at a dilution rate of 100 g / liter, and the fixing portion of the Ricoh wet copying machine FT-500i was removed to obtain an unfixed image. This image was sprayed with ozone at a concentration of 0.1 ppm.
When the set time was examined in the same manner as in Example 1, the set time was 5 hours. When it was left in the air without using ozone, the set time was 1 day.
[0024]
[Table 3]
Figure 0003635304
[0025]
Example 3
As in the apparatus of FIG. 1, the Ricoh wet copying machine FT-500i is modified to recover the ozone generated from the charging charger (7) by the ozone collecting section (8), and the toner blower (10) uses the toner C Was sprayed onto the unfixed image obtained.
The set time was 12 hours, but the ozone generated from the copying machine was 0.01 ppm or less. In the absence of a recovery device, 0.05 ppm of ozone was released into the atmosphere. Moreover, an ozone generator was not necessary and the apparatus could be simplified. Note that the ozone concentration is the ozone detector tube no. 18 was measured.
[0026]
Example 4
Toner D and toner E were prepared by adding 1% of cobalt naphthenate to toner A and toner C with respect to the toner weight. An unfixed image was obtained by removing the fixing portion of the Ricoh wet copying machine FT-500i. This image was sprayed with ozone at a concentration of 0.1 ppm. As a result, as shown in Table 4, the set time could be shortened compared to the case where cobalt naphthenate was not added.
[0027]
[Table 4]
Figure 0003635304
[0028]
Example 5
Figure 0003635304
The toner was flushed and converted into a toner in the same manner as in Example 3 to obtain toner F.
This was further diluted with drill oil at a dilution rate of 100 g / liter, and the fixing portion of the Ricoh wet copying machine FT-500i was removed to obtain an unfixed image. This image was sprayed with ozone at a concentration of 0.1 ppm.
When the density of the obtained image was measured by X-Rite 938, as shown in Table 5, a better result than that of the toner C was obtained.
[0029]
[Table 5]
Figure 0003635304
[0030]
Comparative Example 2
Figure 0003635304
700 parts of Isopar H as a polymerization solvent was placed in a reaction kettle and heated to 120 ° C.
After the above composition was completely dissolved, it was dropped into the reaction kettle over 2 hours. After completion of the dropping, polymerization was further performed at 110 ° C. for 3 hours to obtain a binder resin S having a viscosity of 70 mPa · s and a molecular weight of 2500. Also,
Figure 0003635304
100 parts of Isopar H was taken as a polymerization solvent in a reaction kettle and heated to 90 ° C. After the above composition was completely dissolved, it was dropped into the reaction kettle over 3 hours. After completion of the dropping, polymerization was further performed at 90 ° C. for 3 hours to obtain a binder resin P having a viscosity of 900 mPa · s and a molecular weight of 220,000.
[0031]
Binder resins S and P were converted to toners in the same manner as in Example 1 to obtain toner G and toner H. An unfixed image was prepared in the same manner as the toner A of Example 1, oxidized and fixed with ozone, and the image density and set time were examined. As shown in Table 6, the result was inferior to that of the toner A. It was.
[0032]
[Table 6]
Figure 0003635304
[0033]
Example 6
3% of gelling agent Eugel P (manufactured by BP) was added to toner C to increase the viscosity, and toner I having a viscosity of 5500 mPa · s was obtained. When the set time was examined in the same manner as in Example 3, it was 9 hours as shown in Table 7, which was inferior to the toner C.
[0034]
[Table 7]
Figure 0003635304
[0035]
【The invention's effect】
As is clear from the detailed and specific description above, in the fixing method using the electrophotographic apparatus according to claim 1, since the fixing is performed by chemical change caused by ozone, no solvent is generated and heat is also used. Can be fixed. In addition, since the image recording medium contains at least a part of the non-aqueous solvent containing oil having two or more unsaturated bonds having an electric resistance of 10 9 Ω · cm or more and a dielectric constant of 3.5 or less , the image recording medium can be operated at high speed. Can be fixed. Further, since ozone generated in the photosensitive member charging portion of the electrophotographic apparatus is used as an ozone generation source, an ozone generator and an ozone tank are not required, and an ozone filter for preventing adverse effects on the human body is also unnecessary. . In the fixing method of claim 2, since the ozone concentration is 0.02 to 1.00 ppm, the fixing can be performed efficiently and safely. In the fixing method according to the third aspect, since the ozone to be used is ozone generated by corona discharge, the image forming apparatus can be downsized and the amount of ozone discharged from the image forming apparatus can be reduced . Also, in the fixing method according to claim 4, since the image forming medium is a fat in which at least part of which has a conjugated double bond, it can be fixed quickly. Further, in the fixing method according to claim 5, the image forming medium, because it contains a fatty acid metal salt or naphthenic acid metal salts, can be fixed quickly. In the fixing method of claim 6 , since the image forming medium is flushed with a resin having a softening point of 50 ° C. to 120 ° C., an image having a high image density can be obtained. In the fixing method according to the seventh aspect , since the image forming medium is an acrylic resin having a molecular weight of 3000 to 200,000 , the image forming medium can obtain a high-density image and can be fixed at high speed. In the fixing method according to the eighth aspect , since the viscosity of the image forming medium is 5000 mPa · s or less at room temperature (25 ° C.), an extremely excellent effect that the image can be fixed at high speed is obtained.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of an image forming apparatus according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Photoconductor 2 Paper feed tray 3 Developing tank 4 Developer liquid feeding pipe 5 Developing roller 6 Squeeze roller 7 Charging charger 8 Charging part Ozone collecting part 9 Ozone air feeding pipe 10 Ozone blower 11 Transfer charger 12 Fixing part

Claims (8)

電子写真装置を用い、高絶縁性で低誘電率の非水溶媒中に、着色剤、結着樹脂を主成分として分散してなり、該非水溶媒が少なくともその一部に電気抵抗10 9 Ω・cm以上、誘電率3.5以下で、2つ以上の不飽和結合を持った油脂を含む画像形成媒体未定着画像にオゾンを吹き付けて定着させる方法であって、オゾン供給源として該電子写真装置の感光体帯電部で発生するオゾンを用いることを特徴とする定着方法。 Using an electrophotographic apparatus, a colorant and a binder resin are dispersed as main components in a highly insulating and low dielectric constant non-aqueous solvent, and the non-aqueous solvent has an electric resistance of at least 10 9 Ω · cm or more, the electronic dielectric constant of 3.5 or less, the unfixed image of the image forming medium including two or more oils having an unsaturated bond, a method of fixing by blowing ozone, as ozone source fixing method comprising Rukoto using ozone generated in the photosensitive member charging of the photographic apparatus. 前記オゾンの濃度が0.02〜1.00ppmであることを特徴とする請求項1に記載の定着方法。  The fixing method according to claim 1, wherein the ozone concentration is 0.02 to 1.00 ppm. 前記オゾンがコロナ放電により発生するオゾンであることを特徴とする請求項1又は2に記載の定着方法。  The fixing method according to claim 1, wherein the ozone is ozone generated by corona discharge. 非水溶媒が少なくともその一部に共役二重結合を持った油脂を含むことを特徴とする請求項1乃至3のうち何れか1に記載の定着方法 The non-aqueous solvent, at least fixing method according to any one of claims 1 to 3 thereof, wherein the part containing the fat having a conjugated double bond. 脂肪酸金属塩又はナフテン酸金属塩を含むことを特徴とする請求項1乃至のうち何れか1に記載の定着方法 The fixing method according to any one of claims 1 to 4, characterized in that it comprises a fatty acid metal salt or naphthenic acid metal salt. 該着色剤が、軟化点50℃〜120℃の樹脂でフラッシングされたものであることを特徴とする請求項乃至5のうち何れか1に記載の定着方法The fixing method according to any one of claims 1 to 5, wherein the colorant is flushed with a resin having a softening point of 50C to 120C . 結着樹脂が分子量3000〜200,000のアクリル系樹脂であることを特徴とする請求項乃至6のうち何れか1に記載の定着方法 The fixing method according to any one of claims 1 to 6, characterized in that said binder resin is an acrylic resin having a molecular weight 3000~200,000. 画像形成媒体の粘度が常温(25℃)で5000mPa・s以下であることを特徴とする請求項乃至7のうち何れか1に記載の定着方法 The fixing method according to any one of claims 1 to 7, wherein the viscosity of the imaging medium is 5000 mPa · s or less at normal temperature (25 ° C.).
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