JPH0368958A - Toner for electrophotography - Google Patents
Toner for electrophotographyInfo
- Publication number
- JPH0368958A JPH0368958A JP1205166A JP20516689A JPH0368958A JP H0368958 A JPH0368958 A JP H0368958A JP 1205166 A JP1205166 A JP 1205166A JP 20516689 A JP20516689 A JP 20516689A JP H0368958 A JPH0368958 A JP H0368958A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- antimony
- tin oxide
- external additive
- cerium oxide
- 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
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 24
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 22
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910000420 cerium oxide Inorganic materials 0.000 claims abstract description 21
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 abstract description 28
- 239000003795 chemical substances by application Substances 0.000 abstract description 12
- 239000011347 resin Substances 0.000 abstract description 10
- 229920005989 resin Polymers 0.000 abstract description 10
- 239000011230 binding agent Substances 0.000 abstract description 9
- 239000003086 colorant Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000002156 mixing Methods 0.000 abstract description 5
- 238000005498 polishing Methods 0.000 abstract description 4
- 239000007787 solid Substances 0.000 abstract description 4
- XXLJGBGJDROPKW-UHFFFAOYSA-N antimony;oxotin Chemical compound [Sb].[Sn]=O XXLJGBGJDROPKW-UHFFFAOYSA-N 0.000 abstract 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000001276 controlling effect Effects 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 7
- -1 polypropylene Polymers 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000006229 carbon black Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 3
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000010186 staining Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- VVOLVFOSOPJKED-UHFFFAOYSA-N copper phthalocyanine Chemical compound [Cu].N=1C2=NC(C3=CC=CC=C33)=NC3=NC(C3=CC=CC=C33)=NC3=NC(C3=CC=CC=C33)=NC3=NC=1C1=CC=CC=C12 VVOLVFOSOPJKED-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、静電転写型複写機およびレーザプリンタ等の
電子写真装置に供される電子写真用現像剤に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electrophotographic developer used in electrophotographic apparatuses such as electrostatic transfer copying machines and laser printers.
従来、画像の黒べた部における、中央部の濃度が周辺部
より薄くなる現象であるエツジ効果をなくし、地肌部の
汚れを防止するための電子写真用トナー（以下トナーと
称する）が提案されている（特開昭５８−４０５５７号
公報および特開昭５８−６８０４７号公報参照）。これ
は通常、材料の混合、混線、粉砕および分級の工程を経
て得られたトナー粒状体の表面に、帯電性を制御するた
めに、酸化スズ等の導電制御機能を有する外添剤が添加
されることにより形成されている。Conventionally, toner for electrophotography (hereinafter referred to as toner) has been proposed to eliminate the edge effect, which is a phenomenon in which the density in the central part of a solid black part of an image becomes lighter than the peripheral part, and to prevent stains on the background part. (Refer to Japanese Patent Laid-Open No. 58-40557 and Japanese Patent Laid-Open No. 58-68047). Usually, an external additive with a conductivity control function such as tin oxide is added to the surface of the toner particles obtained through the steps of mixing materials, cross-wiring, pulverization, and classification in order to control charging properties. It is formed by
上記トナー粒状体は、トナーとキャリアとからなる二成
分系の現像剤に使用される場合は、例えば、トナーを構
成する各材料を一体化すると共に着色剤を転写紙上に定
着させるための結着樹脂剤と、トナーに色彩を付与する
ための着色剤と、トナーに帯電性を付与するための帯電
制御剤と、電子写真装置のヒートローラへのトナーの付
着を防止する離型剤等を内添剤として含んでいる。一方
、キャリアを用いずトナー自身に磁性を持たせたー成分
系の現像剤に使用されるトナー粒状体は、例えば、結着
樹脂剤と、トナーに磁性を付与するための磁性体と、着
色剤等を内添剤として含んでいる。When the toner particles are used in a two-component developer consisting of a toner and a carrier, for example, the toner particles are used as a binder to integrate the materials constituting the toner and to fix the colorant on the transfer paper. It contains a resin agent, a coloring agent to impart color to the toner, a charge control agent to impart chargeability to the toner, and a release agent to prevent toner from adhering to the heat roller of an electrophotographic device. Contains it as an additive. On the other hand, toner granules used in component-based developers in which the toner itself has magnetism without using a carrier are, for example, a binder resin agent, a magnetic material for imparting magnetism to the toner, and a coloring agent. Contains agents etc. as internal additives.
ところが、上記従来の構造では、酸化スズ等をトナー粒
状体表面に外添した場合、トナーの流動性が悪化しブリ
ッジ現象を引き起こすため、トナーの円滑な供給が困難
となる。その結果、電子写真装置における良好な画像を
得ることができないという問題点を有している。However, in the conventional structure described above, when tin oxide or the like is externally added to the surface of the toner particles, the fluidity of the toner deteriorates and causes a bridging phenomenon, making it difficult to supply the toner smoothly. As a result, there is a problem in that good images cannot be obtained in an electrophotographic apparatus.
また、一般の静電転写型複写機、特に有機光半導体を感
光体として用いた複写機では、？電器より発生するオゾ
ン等の影響により、感光体の上表面が劣化する。その結
果、トナーによる感光体上のフィル旦ング現象が起こり
、画像が不鮮明となる、いわゆる画像ボケが生じるとい
う問題点をも有している。Also, what about general electrostatic transfer copying machines, especially those using organic photo-semiconductors as photoreceptors? The upper surface of the photoreceptor deteriorates due to the influence of ozone etc. generated from electrical appliances. As a result, there is a problem in that the toner causes a fill phenomenon on the photoreceptor, and the image becomes unclear, so-called image blurring.
本発明の電子写真用トナーは、上記の課題を解決するた
めに、帯電性を制御するための外添剤が添加されている
電子写真用トナーにおいて、上記外添剤が、酸化スズと
アンチモンとの混合物により表面被覆された酸化セリウ
ム微粉末からなることを特徴としている。In order to solve the above-mentioned problems, the electrophotographic toner of the present invention is an electrophotographic toner in which an external additive for controlling charging property is added, in which the external additive contains tin oxide and antimony. It is characterized by consisting of fine cerium oxide powder whose surface is coated with a mixture of.
上記の構成によれば、導電性を持つ外添剤が添加された
トナーは、電気抵抗が低下し安定化する。従って、画像
の黒べた部のエツジ効果をなくし、地肌部の汚れを防止
することができる。According to the above configuration, the toner to which the conductive external additive is added has reduced electrical resistance and is stabilized. Therefore, it is possible to eliminate the edge effect of the solid black portion of the image and prevent staining of the background portion.
また、外添剤の核として利用する酸化セリウムは、研磨
作用を有する。従って、この酸化セリウムを用いた外添
剤により感光体表面を研磨することで、トナーによる感
光体上のフィルミング現象を防止することができる。Furthermore, cerium oxide used as the core of the external additive has a polishing effect. Therefore, by polishing the surface of the photoreceptor with an external additive using cerium oxide, it is possible to prevent the toner from filming on the photoreceptor.
更に、酸化スズとアンチモンとの混合物により表面被覆
された酸化セリウム微粉末によって、トナーの流動性が
向上するので、トナーが円滑に供給される。その結果、
電子写真装置における画像ボケの無い、良好な画像を得
ることができる。Furthermore, the fluidity of the toner is improved by the cerium oxide fine powder whose surface is coated with a mixture of tin oxide and antimony, so that the toner can be smoothly supplied. the result,
It is possible to obtain a good image without image blur in an electrophotographic device.
〔実施例１〕 本発明の一実施例を以下に説明する。[Example 1] An embodiment of the present invention will be described below.
本発明に係る電子写真用トナー（以下トナーと称する）
のトナー粒状体は、例えば、結着樹脂剤であるバインダ
ー樹脂と、着色剤と、帯電制御剤と、離型剤であるワッ
クスとを内添剤として含み、このトナー粒状体の表面に
、酸化スズとアンチモンとの混合物が表面被覆された酸
化セリウム微粉末が外添されて、トナーを形成している
。Toner for electrophotography according to the present invention (hereinafter referred to as toner)
The toner particles contain, for example, a binder resin as a binder resin agent, a colorant, a charge control agent, and a wax as a release agent as internal additives, and the surface of the toner particles is coated with oxidation. Fine cerium oxide powder whose surface is coated with a mixture of tin and antimony is externally added to form the toner.
上記、酸化スズとアンチモンとの混合物は、酸化スズと
アンチモンとが、均一に分散された状態のものであれば
良く、好ましくは酸化スズとアンチモンとの固溶体の状
態が良い。また、酸化スズとアンチモンとの混合比は、
通常、酸化スズ：アンチモンが１００：３〜１００：２
０、好ましくは、１００：５〜１００：１５である。一
方、酸化スズ・アンチモンが被覆された酸化セリウムの
平均粒径は通常、１μｍ以下、好ましくは０．００５〜
０．５μｍ１最適には０．０１〜０．０７μｍである。The above-mentioned mixture of tin oxide and antimony may be one in which tin oxide and antimony are uniformly dispersed, and preferably a solid solution of tin oxide and antimony. Also, the mixing ratio of tin oxide and antimony is
Usually tin oxide: antimony is 100:3 to 100:2
0, preferably 100:5 to 100:15. On the other hand, the average particle size of cerium oxide coated with tin oxide/antimony is usually 1 μm or less, preferably 0.005 to 1 μm.
0.5 μm, optimally 0.01 to 0.07 μm.
更に、酸化セリウムに対する酸化スズとアンチモンとの
混合物の被覆量は、酸化セリウムに対して、通常２０〜
２００重量％、好ましくは４０〜１７０重量％、最適に
は６０〜１４０重量％である。Furthermore, the coating amount of the mixture of tin oxide and antimony on cerium oxide is usually 20 to 20% of cerium oxide.
200% by weight, preferably 40-170%, optimally 60-140%.
尚、バインダー樹脂としては、スチレン、スチレンアク
リル、ポリスチレン、ポリエステル、エポキシ等の樹脂
を使用することができる。Note that as the binder resin, resins such as styrene, styrene acrylic, polystyrene, polyester, and epoxy can be used.
また、着色剤としては、カーボンブラック、銅フタロシ
アニンブルー、アゾ染料等、公知の顔料や染料を使用す
ることができる。Further, as the coloring agent, known pigments and dyes such as carbon black, copper phthalocyanine blue, and azo dyes can be used.
また、帯電制御剤としては、ニグロシン染料、第４級ア
ンモニウム塩等を使用することができる。Further, as the charge control agent, nigrosine dye, quaternary ammonium salt, etc. can be used.
また、ワックスとしては、低分子量ポリプロピレン、低
分子量ポリエチレンなどを使用することができる。Further, as the wax, low molecular weight polypropylene, low molecular weight polyethylene, etc. can be used.
上記の構成において、本トナーの製造方法を以下に説明
する。In the above configuration, a method for manufacturing the present toner will be described below.
先ず、スチレンアクリル８７重量部、カーボンブラック
７重量部、ニグロシン系染料４重量部、低分子量ポリプ
ロピレン２重量部を、ニーダ−で溶融混練し、冷却後、
粉砕、分級して、平均粒径１１μｍのトナー粒状体を得
る。First, 87 parts by weight of styrene acrylic, 7 parts by weight of carbon black, 4 parts by weight of nigrosine dye, and 2 parts by weight of low molecular weight polypropylene were melt-kneaded in a kneader, and after cooling,
It is crushed and classified to obtain toner particles having an average particle size of 11 μm.
そして、この様にして得られたトナー粒状体１００重量
部に対して、平均粒径約０．０３μｍの、酸化スズとア
ンチモンとの混合物（酸化スズ：アンチモン＝１０：１
）により被覆された酸化セリウムの微粉末１重量部と、
平均粒径約０．０１５μｍの疎水性シリカ１重量部とを
加えて、均一に外添混合し正帯電性トナーを得る。A mixture of tin oxide and antimony (tin oxide:antimony=10:1) having an average particle diameter of about 0.03 μm was added to 100 parts by weight of the toner particles thus obtained.
) 1 part by weight of fine powder of cerium oxide coated with
1 part by weight of hydrophobic silica having an average particle size of about 0.015 μm is added and uniformly mixed externally to obtain a positively chargeable toner.
次に、上記のようにして作製したトナー６重量部と、シ
リコンコートされた鉄粉からなる、平均粒径９５μｍの
キャリアを混合して得られた二成分系の現像剤を用いて
、連続１００００枚の画像形成を行った結果、地肌部の
汚れや濃度むらの無い、良好な画像が得られた。Next, using a two-component developer obtained by mixing 6 parts by weight of the toner prepared as described above with a carrier made of silicon-coated iron powder and having an average particle size of 95 μm, a continuous 10,000 As a result of forming an image on two sheets, a good image was obtained with no dirt on the background or uneven density.
〔実施例２〕 本発明の他の実施例を以下に説明する。[Example 2] Other embodiments of the invention will be described below.
本発明に係るトナーのトナー粒状体は、例えば、バイン
ダー樹脂、着色剤、帯電制御剤、ワックス等を内添剤と
して含み、このトナー粒状体の表面に、酸化スズとアン
チモンとの混合物が表面被覆された酸化セリウム微粉末
が外添されて、トナーを構成している。The toner particles of the toner according to the present invention contain, for example, a binder resin, a colorant, a charge control agent, wax, etc. as internal additives, and the surface of the toner particles is coated with a mixture of tin oxide and antimony. The fine cerium oxide powder is added externally to form the toner.
上記の構成において、本トナーの製造方法を以下に説明
する。In the above configuration, a method for manufacturing the present toner will be described below.
先ず、スチレンアクリル８８重量部、カーボンブラック
６重量部、第４級アンモニウム塩４重量部、低分子量ポ
リプロピレン１重量部、低分子量ポリエチレン１重量部
を、ニーダ−で溶融混練し、冷却後、粉砕、分級して、
平均粒径１０μｍのトナー粒状体を得る。First, 88 parts by weight of styrene acrylic, 6 parts by weight of carbon black, 4 parts by weight of quaternary ammonium salt, 1 part by weight of low molecular weight polypropylene, and 1 part by weight of low molecular weight polyethylene were melt-kneaded in a kneader, and after cooling, pulverized. Classify,
Toner particles having an average particle size of 10 μm are obtained.
そして、この様にして得られたトナー粒状体１００重量
部に対して、平均粒径約０．０５μｍの、酸化スズとア
ンチモンとの混合物（酸化スズ：アンチモン＝１００：
１２）により被覆された酸化セリウム微粉末１重量部と
、平均粒径約０．０１５μｍの疎水性シリカ１重量部と
を加えて、均一に外添混合しトナーを得る。Then, a mixture of tin oxide and antimony (tin oxide: antimony = 100:
1 part by weight of cerium oxide fine powder coated with step 12) and 1 part by weight of hydrophobic silica having an average particle size of about 0.015 μm are added and uniformly mixed externally to obtain a toner.
次に、上記のようにして作製したトナー６重量部と、シ
リコンコートされたフェライトからなる、平均粒径１０
０μｍのキャリア９４重量部を混合して得られた二成分
系の現像剤を用いて、連続１ｏｏｏｏ枚の画像形成を行
った結果、地肌部の汚れや濃度むらの無い、良好な画像
が得られた。Next, 6 parts by weight of the toner produced as described above and silicone-coated ferrite were used, with an average particle size of 10.
Using a two-component developer obtained by mixing 94 parts by weight of a 0 μm carrier, 100 images were continuously formed, and as a result, a good image was obtained with no background stains or density unevenness. Ta.
〔実施例３〕 本発明の更に他の実施例を以下に説明する。[Example 3] Still other embodiments of the invention will be described below.
本発明に係るトナーのトナー粒状体は、例えばバインダ
ー樹脂と、磁性体と、着色剤等を内添剤として含み、こ
のトナー粒状体の表面に、酸化スズとアンチモンとの混
合物が表面被覆された酸化セリウム微粉末が外添されて
、トナーを構成している。The toner particles of the toner according to the present invention contain, for example, a binder resin, a magnetic material, a colorant, etc. as internal additives, and the surfaces of the toner particles are coated with a mixture of tin oxide and antimony. Fine cerium oxide powder is added externally to form the toner.
この場合、磁性体として、マグネタイト等の磁性材料を
バインダー樹脂１００重量部に対して、約２５〜５０重
量部加える必要がある。In this case, it is necessary to add about 25 to 50 parts by weight of a magnetic material such as magnetite to 100 parts by weight of the binder resin.
上記の構成において、本トナーの製造方法を以下に説明
する。In the above configuration, a method for manufacturing the present toner will be described below.
先ず、ポリエチレン７０重量部、マグネタイト３０重量
部をニーダ−で溶融混練し、冷却後、粉砕、分級して、
平均粒径１２μｍの磁性トナー粒状体を得る。First, 70 parts by weight of polyethylene and 30 parts by weight of magnetite were melted and kneaded in a kneader, and after cooling, they were crushed and classified.
Magnetic toner particles having an average particle size of 12 μm are obtained.
そして、この様にして得られたトナー粒状体１００重量
部に対して、平均粒径約０．’０４μｍの、酸化スズと
アンチモンとの混合物（酸化スズ：アンチモン−１０：
１）により被覆された酸化セリウム微粉末を１重量部と
、酸化チタン微粉末１重量部とを加えて均一に外添混合
し、−成分系の磁性トナーを得る。For 100 parts by weight of the toner particles thus obtained, an average particle size of about 0. A mixture of tin oxide and antimony (tin oxide: antimony-10:
1 part by weight of the cerium oxide fine powder coated in step 1) and 1 part by weight of the titanium oxide fine powder are added and mixed uniformly to obtain a -component type magnetic toner.
次に、上記のようにして作製したトナーからなる現像剤
を用いて、連続１００００枚の画像形成を行った結果、
地肌部の汚れや濃度むらの無い、良好な画像が得られた
。Next, as a result of continuously forming images on 10,000 sheets using the developer made of the toner prepared as described above,
A good image was obtained with no stains or density unevenness in the background area.
実施例１に示したトナー粒状体に対して、酸化スズとア
ンチモンとの混合物が表面被覆された酸化セリウム微粉
末を外添しないトナーを用いて、二成分系の現像剤を得
た。A two-component developer was obtained by using the toner particles shown in Example 1 without externally adding cerium oxide fine powder whose surface was coated with a mixture of tin oxide and antimony.
次に、この現像剤を用いて、連続１００００枚の画像形
成を行った結果、地肌部に汚れが生じたり、画像に濃度
むらが発生した。Next, as a result of continuously forming images on 10,000 sheets using this developer, stains appeared on the background and density unevenness occurred in the images.
本発明に係る電子写真用トナーは、以上のように、帯電
性を制御するための外添剤が添加されている電子写真用
トナーにおいて、上記外添剤が、酸化スズとアンチモン
との混合物により表面被覆された酸化セリウム微粉末か
らなる構成である。As described above, the electrophotographic toner according to the present invention is an electrophotographic toner to which an external additive for controlling chargeability is added, in which the external additive is a mixture of tin oxide and antimony. It consists of surface-coated cerium oxide fine powder.
これにより、導電性を持つ外添剤が添加されたトナーは
、電気抵抗が低下し安定化する。従って、画像の黒べた
部のエツジ効果をなくし、地肌部の汚れを防止すること
ができる。As a result, the toner to which the conductive external additive is added has a reduced electrical resistance and is stabilized. Therefore, it is possible to eliminate the edge effect of the solid black portion of the image and prevent staining of the background portion.
また、研磨作用を有する酸化セリウムを外添剤の核とし
て用いることにより、感光体表面を研磨することができ
る。従って、トナーによる感光体上のフィルミング現象
を防止することができる。Furthermore, the surface of the photoreceptor can be polished by using cerium oxide, which has a polishing effect, as a core of the external additive. Therefore, the filming phenomenon caused by toner on the photoreceptor can be prevented.
更に、酸化スズとアンチモンとの混合物により表面被覆
された酸化セリウム微粉末によって、トナーの流動性が
向上するので、トナーが円滑に供給される。Furthermore, the fluidity of the toner is improved by the cerium oxide fine powder whose surface is coated with a mixture of tin oxide and antimony, so that the toner can be smoothly supplied.
以上のことから、電子写真装置における、画像ボケや濃
度むらの無い、良好な画像を得ることができるという効
果を奏する。From the above, it is possible to obtain a good image without image blur or density unevenness in an electrophotographic apparatus.
Claims (1)
子写真用トナーにおいて、 上記外添剤が、酸化スズとアンチモンとの混合物により
表面被覆された酸化セリウム微粉末からなることを特徴
とする電子写真用トナー。[Claims] 1. In an electrophotographic toner to which an external additive for controlling chargeability is added, the external additive is a cerium oxide fine powder whose surface is coated with a mixture of tin oxide and antimony. An electrophotographic toner characterized by being made of powder.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205166A JPH0368958A (en) | 1989-08-08 | 1989-08-08 | Toner for electrophotography |
| DE69016316T DE69016316T2 (en) | 1989-08-08 | 1990-08-06 | Electrophotography toner and process for the production thereof. |
| EP90308634A EP0416750B1 (en) | 1989-08-08 | 1990-08-06 | Toner for use in electrophotography and its manufacturing process |
| US08/079,796 US5332639A (en) | 1989-08-08 | 1992-01-06 | Toner for use in electrophotography and its manufacturing process comprising a charge control additive of an oxide coated with a mixture of tin oxide and antimony |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1205166A JPH0368958A (en) | 1989-08-08 | 1989-08-08 | Toner for electrophotography |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0368958A true JPH0368958A (en) | 1991-03-25 |
Family
ID=16502518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1205166A Pending JPH0368958A (en) | 1989-08-08 | 1989-08-08 | Toner for electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0368958A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0687960A1 (en) | 1994-06-14 | 1995-12-20 | Canon Kabushiki Kaisha | Toner for developing electrostatic images and image forming method |
| JP2014238450A (en) * | 2013-06-06 | 2014-12-18 | 富士ゼロックス株式会社 | Electrostatic charge image developer, process cartridge, image forming method, and image forming apparatus |
-
1989
- 1989-08-08 JP JP1205166A patent/JPH0368958A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0687960A1 (en) | 1994-06-14 | 1995-12-20 | Canon Kabushiki Kaisha | Toner for developing electrostatic images and image forming method |
| US5614344A (en) * | 1994-06-14 | 1997-03-25 | Canon Kabushiki Kaisha | Toner for developing electrostatic images and image forming method |
| JP2014238450A (en) * | 2013-06-06 | 2014-12-18 | 富士ゼロックス株式会社 | Electrostatic charge image developer, process cartridge, image forming method, and image forming apparatus |
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