JPH02257144A - Positive chargeable toner - Google Patents
Positive chargeable tonerInfo
- Publication number
- JPH02257144A JPH02257144A JP1079575A JP7957589A JPH02257144A JP H02257144 A JPH02257144 A JP H02257144A JP 1079575 A JP1079575 A JP 1079575A JP 7957589 A JP7957589 A JP 7957589A JP H02257144 A JPH02257144 A JP H02257144A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- silica
- particles
- image
- mixing
- 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
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 114
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000000377 silicon dioxide Substances 0.000 abstract description 52
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 14
- 230000002209 hydrophobic effect Effects 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 5
- 238000004381 surface treatment Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 230000002688 persistence Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- LDXJRKWFNNFDSA-UHFFFAOYSA-N 2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)-1-[4-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]piperazin-1-yl]ethanone Chemical group C1CN(CC2=NNN=C21)CC(=O)N3CCN(CC3)C4=CN=C(N=C4)NCC5=CC(=CC=C5)OC(F)(F)F LDXJRKWFNNFDSA-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical class N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、電子複写機、レーザプリンタ等の電子写真プ
ロセスに使用される正帯電トナー〜に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a positively charged toner used in electrophotographic processes such as electronic copying machines and laser printers.
（従来の技術）
一般的に知られているように電子写真プロセスにおいて
は、感光体上に静電潜像を形成し、次に帯電させたトナ
ーを接触あるいは近接させることにより静電潜像を顕像
化し、さらに紙に転写し、そして定着することにより複
写画像を形成している。このプロセスにおいて、トナー
には多くの物理的、７ヒ学的、熱的特性が要求されてお
り、従来から種々の発明、改良がなされている。特にト
ナーの帯電性及びその持続性は複写画像に最も重要な影
響を及ぼすため、最大の注意が払われている。(Prior Art) As is generally known, in the electrophotographic process, an electrostatic latent image is formed on a photoreceptor, and then charged toner is brought into contact with or in close proximity to the electrostatic latent image. A copy image is formed by visualizing the image, transferring it to paper, and fixing it. In this process, the toner is required to have many physical, chemical, and thermal properties, and various inventions and improvements have been made in the past. In particular, the charging properties of toner and its persistence have the most important effect on copied images, and therefore the greatest attention is paid to them.
このようなトナーの特性を改良する方法として、例えば
、特開昭４６−５７８２号公報に記載されているように
疎水化処理されたシリカをトナーあるいは現像剤に添加
する方法が広く知られている。As a method for improving the characteristics of such toner, for example, a method of adding hydrophobized silica to toner or developer as described in JP-A-46-5782 is widely known. .
トナーあるいは現像剤にこの疎水性シリカを添加すると
、トナーの帯電特性が改善されるだけでなくトナーの保
存性及び流動性が向上する。この流動性が向上すると、
電子写真プロセスにおいて感光体のクリーニング性が良
くなる。このような利点のため、疎水性シリカの添加は
、現在ではほとんどのトナーについて行われている。な
お、ここで用いられる疎水性シリカとは、シリカ微粉末
を有機基を持つシランカップリング剤で処理し、シリカ
表面のシラノール基（＝Ｓｉ−ＯＨ）と縮合させたもの
であるが、−船釣に強い負の電荷を有する。そのため、
主として負帯電トナーに添加されている。これに対し、
正帯電トナー用としては、例えば特公昭５３−２２４４
７号公報に示すように、窒素を含むカップリング剤等で
処理された正帯電性シリカが開発されている。Adding this hydrophobic silica to a toner or developer not only improves the charging characteristics of the toner but also improves the storage stability and fluidity of the toner. When this liquidity improves,
The cleaning performance of the photoreceptor is improved in the electrophotographic process. Because of these advantages, the addition of hydrophobic silica is now practiced in most toners. The hydrophobic silica used here is one obtained by treating fine silica powder with a silane coupling agent having an organic group and condensing it with the silanol group (=Si-OH) on the silica surface. Has a strong negative charge for fishing. Therefore,
It is mainly added to negatively charged toner. On the other hand,
For positively charged toner, for example, Japanese Patent Publication No. 53-2244
As shown in Publication No. 7, positively chargeable silica treated with a nitrogen-containing coupling agent or the like has been developed.
（発明が解決しようとする課題）
この正帯電性シリカは、負帯電性シリカと比較して耐湿
性が悪く、保存性及び流動性が良くないので、トナーに
添加した場合画像の持続性が悪い。しかしながら、その
ような欠点がない負帯電性シリカを正帯電トナーに添加
すると、このシリカの負帯電性の影響でトナーの帯電量
及び現像機に供給された後の帯電の立上がり速度が低下
し、複写画像のカブリや機体内へのトナー飛散が増加す
るという問題がある。(Problems to be Solved by the Invention) Compared to negatively charged silica, this positively charged silica has poor moisture resistance, poor storage stability, and fluidity, so when added to toner, image persistence is poor. . However, when negatively chargeable silica, which does not have such drawbacks, is added to positively charged toner, the amount of charge on the toner and the speed at which the charge rises after being supplied to the developing machine decreases due to the negative chargeability of this silica. There is a problem that fogging of the copied image and toner scattering inside the machine increase.
本発明は、上記事情に鑑みてなされたもので、流動性及
び保存性に優れ、かつ良好な帯電性及びその帯電の持続
性を有するとともに、連続複写による画像濃度の低下及
びカブリの少ない複写画像を得ることができる正帯電Ｉ
・ナーを提供することを目的ｌとする。The present invention has been made in view of the above circumstances, and has excellent fluidity and storage stability, good charging property and durability of charging, and reproduced images with less decrease in image density and less fog due to continuous copying. Positive charge I that can be obtained
・The purpose is to provide support.
［発明の構成コ
（課題を解決するための手段）
本発明者等は、負帯電性の疎水性シリカと正帯電性シリ
カとの長所を生かして正帯電トナーの特性の改良を検討
し、本発明をなすに至った。[Structure of the Invention (Means for Solving the Problem) The present inventors have studied the improvement of the characteristics of positively charged toner by taking advantage of the advantages of negatively chargeable hydrophobic silica and positively chargeable silica, and have developed the present invention. He came up with an invention.
本発明の正帯電トナーは、表面を負帯電性シリカ粒子で
処理されたトナー粒子と、正帯電性シリカ粒子とを混合
してなることを特徴とする。The positively charged toner of the present invention is characterized in that it is made by mixing toner particles whose surfaces have been treated with negatively charged silica particles and positively charged silica particles.
本発明に用いられるトナー粒子は、通常の方法により、
負帯電性の疎水性シリカによって表面処理されている。The toner particles used in the present invention can be prepared by a conventional method.
Surface treated with negatively charged hydrophobic silica.
この表面処理方法として、例えば、トナー粒子とシリカ
粒子とをヘンシェルミキサーを用いて気流渦中で混合す
る方法、ジェットミルを用いて衝突させる方法、ハイブ
リタイザを用いて造粒する方法等を使用することができ
る。As this surface treatment method, for example, a method of mixing toner particles and silica particles in an air vortex using a Henschel mixer, a method of colliding them using a jet mill, a method of granulating using a hybridizer, etc. may be used. I can do it.
前記表面処理方法においては、通常の条件よりも混合時
間、混合回転数等の条件を厳しくすることが好ましい。In the surface treatment method, it is preferable that conditions such as mixing time and mixing rotation speed are made stricter than usual conditions.
通常よりも緩い条件で表面処理を行なうと、トナーから
遊離している浮遊シリカが残留し、トナーの帯電性及び
その持続性に悪影響を及ぼす傾向があり、さらに正帯電
性シリカと混合する際にシリカ同志が凝集し易くなると
ともに均一な混合物が得られなくなり、カブリの増加を
招く傾向がある。If surface treatment is performed under milder conditions than usual, floating silica released from the toner tends to remain, which has a negative effect on the toner's chargeability and its sustainability, and furthermore, when mixed with positively chargeable silica, Silica particles tend to aggregate together, making it impossible to obtain a homogeneous mixture, which tends to increase fog.
以上のことを考慮すると、負帯電性の疎水性シリカによ
るトナーの表面処理の効果的かつ容易な方法としては、
トナーをジェットミルにて微粉砕し、そのとき気流中に
該シリカを添加することが好ましい。そのためには、前
記ジェットミルの原料材の供給口にシリカの定量供給口
を併設することも可能であるが、トナー粗粒とシリカと
を混合したものを原材料として該ジェットミルに供給し
、微粉砕する方が簡便である。このような方法により、
トナー表面に負帯電性シリカを均一がっ強固に付着させ
ることが可能であり、また粉砕機中でト
ナ−
上する。Considering the above, an effective and easy method for toner surface treatment using negatively charged hydrophobic silica is as follows:
It is preferable to pulverize the toner using a jet mill, and then add the silica to the air stream. To this end, it is possible to provide a quantitative supply port for silica to the raw material supply port of the jet mill, but a mixture of toner coarse particles and silica is supplied to the jet mill as a raw material, and fine particles are supplied to the jet mill as a raw material. It is easier to crush. By such a method,
It is possible to uniformly and firmly adhere negatively charged silica to the surface of the toner, and the toner is removed in a pulverizer.
、本発明の正帯電トナーは、負帯電性の疎水性シリカに
より表面処理されたトナーと正帯電性シリカとを通常の
方法を用いて混合してなる。この混合は、通常の混合装
置を用い、通常の混合条件で行なうことができる。また
、好ましくは、混合時間、混合回転数等の混合の条件を
多少緩くすると良い。これらの緩い条件下で混合を行な
うと、トナーの流動性、及び帯電性が向上する。The positively charged toner of the present invention is prepared by mixing a toner surface-treated with negatively charged hydrophobic silica and positively charged silica using a conventional method. This mixing can be carried out using a normal mixing device under normal mixing conditions. Preferably, mixing conditions such as mixing time and mixing rotation speed may be made somewhat looser. Mixing under these mild conditions improves the fluidity and chargeability of the toner.
本発明に用いられるトナー粒子は、−船釣な着色剤、樹
脂バインダ及び帯電制御剤等の成分からなる組成物であ
り、通常のものを使用することができる。The toner particles used in the present invention are a composition consisting of components such as a colorant, a resin binder, and a charge control agent, and ordinary toner particles can be used.
前記着色剤としては、カーボンブラック、酸化鉄、フェ
ライ！・、ニグロシン等の染料を使用することができる
。また、各色の有機あるいは無機顔料を使用することに
より、カラートナーを調製することも可能である。Examples of the colorant include carbon black, iron oxide, and Ferai!・Dye such as nigrosine can be used. It is also possible to prepare color toners by using organic or inorganic pigments of each color.
前記樹脂バインダとしては、ポリスチレン、スチレンま
たはスチレン誘導体と、メチルメタクリレ−１・、アク
リル酸、メタクリル酸、マレイン酸等の不飽和カルボン
酸（エステル）との共重合体、スチレン−ブタジェン共
重合体、ポリエチレン、ポリプロピレン、ポリエステル
、エポキシ樹脂、ポリビニルブチラール等を使用するこ
とができる。As the resin binder, a copolymer of polystyrene, styrene or a styrene derivative and an unsaturated carboxylic acid (ester) such as methyl methacrylate-1, acrylic acid, methacrylic acid, or maleic acid, or a styrene-butadiene copolymer can be used. , polyethylene, polypropylene, polyester, epoxy resin, polyvinyl butyral, etc. can be used.
前記帯電制御剤としては、必要に応じてニグロシン、４
級アンモニウム塩、フタロシアニン誘導体等を使用する
ことができる。As the charge control agent, nigrosine, 4
Grade ammonium salts, phthalocyanine derivatives, etc. can be used.
るシリカは、帯電性及び流動性にはほとんど影響しない
が、！・ナーの保存性、画像の持続性に効果を示すこと
がわかった。従って、帯電性に難点はあるがトナーの保
存性及び画像の持続性に効果のある負帯電性シリカをト
ナー粒子表面に付着させ、トナーの保存性に難点はある
が帯電性に優れた正帯電性シリカをトナー粒子と混合す
ることにより、負帯電性シリカ及び正帯電性シリカの両
者の長所を生かした正帯電トナーを得ることができる。Silica has almost no effect on chargeability and fluidity, but!・It was found to be effective in improving the storage stability of the image and the persistence of the image. Therefore, negatively charged silica, which has a disadvantage in chargeability but is effective in toner storage stability and image persistence, is attached to the surface of toner particles, and positively charged silica, which has an excellent chargeability although it has a disadvantage in toner storage stability, is attached to the toner particle surface. By mixing static silica with toner particles, it is possible to obtain a positively charged toner that takes advantage of the advantages of both negatively charged silica and positively charged silica.
（作用）
本発明は、正帯電トナーをつくるための適切なシリカの
添加法による、シリカによる性能の向」二の要因につい
て種々検討した結果なされたものである。すなわち、本
発明者等は、シリカ粒子のトナー中での存在の仕方によ
り得られる効果が異なることを見出だした。トナーから
遊離しているかあるいは弱く４７１着しているシリカは
、トナーあるいは現像剤の流動性を向上さぜるほか帯電
性に大きく影響する。一方、トナーに強く付着してい（
実施例）
実施例Ｉ
ＴＢ−１０００（Ｓｔ−Ａｃ樹脂；三洋化成）８８重量
部、ビスコール６６０Ｐ （ＰＰワックス；三洋化成）
４重量部、ＭＡ−６００（カーボンブラック；三菱化成
）６重量部、Ｎ−０１にグロシン染料；オリエント化学
）２重量部を均一に混合した後、加圧式ニーダを用いて
１２５°Ｃにて３０分間混練した。冷却後ハンマーミル
にて粗砕して平均粒径２ ｍｍ以下のトナーチップを得
た。(Function) The present invention was made as a result of various studies on the two factors for improving the performance of silica through an appropriate method of adding silica to produce a positively charged toner. That is, the present inventors have found that the effects obtained differ depending on the way the silica particles exist in the toner. Silica, which is free or weakly attached to the toner, not only improves the fluidity of the toner or developer, but also greatly affects the charging properties. On the other hand, it strongly adheres to the toner (
Examples) Example I 88 parts by weight of TB-1000 (St-Ac resin; Sanyo Chemical), Viscole 660P (PP wax; Sanyo Chemical)
After uniformly mixing 4 parts by weight of MA-600 (carbon black; Mitsubishi Kasei), 2 parts by weight of N-01 and groscine dye; Kneaded for a minute. After cooling, it was crushed using a hammer mill to obtain toner chips having an average particle size of 2 mm or less.
このチップ１００重量部と負帯電性の疎水性シリカＲ−
９７２１重量部を混合した後Ｉ型ジェットミルーＤＳ分
級機にて平均粒径１１．０μｍになるように微粉砕分級
した。さらに、この微粉砕物１００重量部と正帯電性シ
リカＲＩ）１３００．３重量部をヘンシェルミキサにて
混合し、正帯電トナーを得た。100 parts by weight of this chip and negatively charged hydrophobic silica R-
After mixing 9721 parts by weight, the mixture was pulverized and classified using a Type I Jet Mill DS classifier so that the average particle size was 11.0 μm. Further, 100 parts by weight of this finely pulverized material and 1300.3 parts by weight of positively chargeable silica (RI) were mixed in a Henschel mixer to obtain a positively charged toner.
前記トナーの流動性は良好であり、また、５０°Ｃで８
時間放置した後のケーキングも良好であり、保存性に優
れていることかわかった。The toner has good fluidity and has a temperature of 8 at 50°C.
It was found that the caking after standing for a period of time was also good, indicating that the product had excellent storage stability.
次に、前記トナー１００重量部に対しフェライトキャリ
ヤーＦ−１５０を４重量部混合し、現像剤を調製した。Next, 4 parts by weight of ferrite carrier F-150 were mixed with 100 parts by weight of the toner to prepare a developer.
この現像剤を用い、電子写真複写機レオドライＢＤ−２
８１０（東芝製）を使用して、複写画像の評価試験を行
なった。その結果、４万枚の連続複写の後でも画像濃度
の低下及びカブリは見られなかった。また、機内への現
像剤の飛散も少なかった。また、温度３０℃湿度８５％
の環境に２４時間放置したトナーによって前記と同様の
試験を行なったところ、同様に良好な結果が得られた。Using this developer, electrophotographic copying machine RheoDry BD-2
810 (manufactured by Toshiba) was used to conduct an evaluation test for copied images. As a result, no decrease in image density or fogging was observed even after continuous copying of 40,000 sheets. Also, there was less developer scattering inside the machine. Also, the temperature is 30℃ and the humidity is 85%.
When the same test as above was conducted using the toner left in the environment for 24 hours, similarly good results were obtained.
実施例２
実施例１と同様にして得られたトナーチップを微粉砕、
分級し、平均粒径］１．０μｍにした。Example 2 Toner chips obtained in the same manner as in Example 1 were pulverized,
The particles were classified to have an average particle size of 1.0 μm.
この微粉砕されたトナー１００重量部と負帯電性の疎水
性シリカＲ−９７２０，５重量部を混合し、ハンブリタ
イザー（奈良機械 製）内で５分間表面処理を行なった
。さらに、この表面処理されたトナー１００重量部に対
し正帯電性シリカＲＰ−１３００３重量部をヘンシェル
ミキサを用いて混合し、正帯電トナーを得た。得られた
トナーは流動性、保存性ともに良好であった。このトナ
ーを実施例１と同様にして複写画像の評価試験を行なっ
たところ、実施例１と同様の良好な結果が得られた。ま
た、実施例１と同様に放置後のトナーを用いて試験を行
なったところ、同様の良好な結果が得られた。100 parts by weight of this finely pulverized toner and 5 parts by weight of negatively charged hydrophobic silica R-9720 were mixed, and the mixture was subjected to surface treatment for 5 minutes in a Hamblitizer (manufactured by Nara Kikai). Furthermore, 3 parts by weight of positively chargeable silica RP-1300 was mixed with 100 parts by weight of this surface-treated toner using a Henschel mixer to obtain a positively chargeable toner. The obtained toner had good fluidity and good storage stability. When this toner was subjected to a copy image evaluation test in the same manner as in Example 1, good results similar to those in Example 1 were obtained. Further, when a test was conducted using the toner after being left in the same manner as in Example 1, similar good results were obtained.
比較例１
実施例２と同様にして微粉砕されたトナ１００重量部に
負帯電性シリカＲ−９７２０．３重量部をヘンケルミキ
サ内で混合し、トナーを得た。得られたトナーは、流動
性及び保存性は良好であったが、実施例１と同様にして
複写画像を評価したところ、連続複写初期からカブリが
多くみられた。Comparative Example 1 100 parts by weight of toner finely pulverized in the same manner as in Example 2 was mixed with 0.3 parts by weight of negatively chargeable silica R-972 in a Henkel mixer to obtain a toner. The obtained toner had good fluidity and storage stability, but when the copied images were evaluated in the same manner as in Example 1, a lot of fogging was observed from the beginning of continuous copying.
比較例２
実施例２と同様にして微粉砕されたトナー］０００重量
と、正帯電性シリカＲＰ −１，３００，３重量部とを
ヘンシェルミキサ内で混合し、トナーを得た。得られた
トナーは、流動性、保存性が不十分であった。また、実
施例］と同様にして複写画像の評価試験を行なったとこ
ろ、約２万枚の連続複写後、画像濃度が低下した。実施
例１と同様にして高温多湿の環境に放置したトナーを用
い、前記と同様の画像評価試験をおこなったところ、カ
ブリが著しく増加した。Comparative Example 2 Toner finely pulverized in the same manner as in Example 2] 000 weight and 3 parts by weight of positively chargeable silica RP-1,300 were mixed in a Henschel mixer to obtain a toner. The obtained toner had insufficient fluidity and storage stability. Further, when an evaluation test of the copied images was carried out in the same manner as in Example, the image density decreased after about 20,000 copies were continuously made. When an image evaluation test similar to that described above was conducted using a toner that had been left in a hot and humid environment in the same manner as in Example 1, fogging increased significantly.
比較例３
実施例２と同様にして微粉砕されたトナー１００重量部
に対し負帯電性シリカＲ−９７２０，２重量部及び正帯
電性シリカＲＰ−１３００，２重量部をヘンシェルミキ
サ内で混合し、トナーを得た。得られたトナーの流動性
、保存性は良好であった。実施例１と同様にして複写画
像の評価試験を行なったところ、連続複写初期よりカブ
リが多く見られ、２万枚の連続複写後には画像濃度の低
下及びカブリの増加が見られた。Comparative Example 3 2 parts by weight of negatively chargeable silica R-9720 and 2 parts by weight of positively chargeable silica RP-1300 were mixed in a Henschel mixer with 100 parts by weight of toner finely pulverized in the same manner as in Example 2. , got toner. The obtained toner had good fluidity and storage stability. When the evaluation test of the copied images was carried out in the same manner as in Example 1, more fog was observed from the beginning of continuous copying, and after 20,000 sheets of continuous copying, a decrease in image density and an increase in fog were observed.
実施例１及び実施例２に示すように、本発明のトナーを
用いると、４万枚の連続複写を行なっても画像濃度の低
下及びカブリはほとんど見られず、また、該トナーを高
温多湿の環境に放置した後同様にして連続複写を行なっ
ても同じような結果が得られる。しかしながら、比較例
１のように負帯電性シリカのみを添加した場合には、カ
ブリの多い複写画像となり、比較例２のように正帯電性
シリカのみを用いた場合には連続複写の後に画像濃度が
低下し、さらに、高温多湿の環境に放置したトナーを用
いると画像のカブリが著しく増加する。As shown in Examples 1 and 2, when the toner of the present invention is used, there is hardly any decrease in image density or fog even after 40,000 copies are made continuously, and the toner is not exposed to high temperature and high humidity. A similar result can be obtained even if continuous copying is performed in the same manner after leaving it in the environment. However, when only negatively charged silica is added as in Comparative Example 1, the resulting copied image has a lot of fog, and when only positively charged silica is used as in Comparative Example 2, the image density increases after continuous copying. Moreover, if toner is left in a hot and humid environment, image fogging will significantly increase.
また、比較例３のように正帯電性シリカと負帯電性シリ
カとを単に混合することにより得たトナーは、流動性及
び保存性は良好であったが、連続後写の初期より複写画
像のカブリが見られ、次第に画像′ａ度も低下する。In addition, the toner obtained by simply mixing positively chargeable silica and negatively chargeable silica as in Comparative Example 3 had good fluidity and storage stability, but it was noted that the toner obtained by simply mixing positively chargeable silica and negatively chargeable silica had good fluidity and storage stability, but the resulting Fog is observed, and the image quality gradually decreases.
Ｃ発明の効果コ
本発明の正帯電トナーは流動性及び保存性に優れており
、かつ良好な帯電性及び画像の持続性を有する。したが
って、本発明の正帯電トナーを用いると、連続複写によ
る画像濃度の低下及びカブリの少ない複写画像を得るこ
とができる。また、機内へのトナーの飛散も起り難い。C Effects of the Invention The positively charged toner of the present invention has excellent fluidity and storage stability, and also has good charging properties and image sustainability. Therefore, by using the positively charged toner of the present invention, it is possible to obtain a copied image with less reduction in image density and less fog due to continuous copying. Furthermore, toner scattering into the cabin is less likely to occur.
出願人代理人 弁理士 鈴江武１ｇApplicant's agent: Patent attorney Takeshi Suzue 1g
Claims (1)
該トナー粒子に混合された正帯電性シリカ粒子とを含む
ことを特徴とする正帯電トナー。toner particles whose surfaces are treated with negatively charged silica particles;
A positively charged toner comprising positively charged silica particles mixed with the toner particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1079575A JPH02257144A (en) | 1989-03-30 | 1989-03-30 | Positive chargeable toner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1079575A JPH02257144A (en) | 1989-03-30 | 1989-03-30 | Positive chargeable toner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02257144A true JPH02257144A (en) | 1990-10-17 |
Family
ID=13693795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1079575A Pending JPH02257144A (en) | 1989-03-30 | 1989-03-30 | Positive chargeable toner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02257144A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013122499A (en) * | 2011-12-09 | 2013-06-20 | Sakata Corp | Toner for nonmagnetic electrostatic charge image developing and manufacturing method thereof |
-
1989
- 1989-03-30 JP JP1079575A patent/JPH02257144A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013122499A (en) * | 2011-12-09 | 2013-06-20 | Sakata Corp | Toner for nonmagnetic electrostatic charge image developing and manufacturing method thereof |
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