JPH0432382B2 - - Google Patents
Info
- Publication number
- JPH0432382B2 JPH0432382B2 JP63101399A JP10139988A JPH0432382B2 JP H0432382 B2 JPH0432382 B2 JP H0432382B2 JP 63101399 A JP63101399 A JP 63101399A JP 10139988 A JP10139988 A JP 10139988A JP H0432382 B2 JPH0432382 B2 JP H0432382B2
- Authority
- JP
- Japan
- Prior art keywords
- toner
- weight
- zinc oxide
- developer
- particle size
- 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.)
- Expired - Lifetime
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 42
- 239000000843 powder Substances 0.000 claims description 13
- 239000011164 primary particle Substances 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000003086 colorant Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 description 20
- 239000002245 particle Substances 0.000 description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 108091008695 photoreceptors Proteins 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 241000519995 Stachys sylvatica Species 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- -1 for example Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 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
- 239000006229 carbon black Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000011163 secondary particle Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920007962 Styrene Methyl Methacrylate Polymers 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 206010047642 Vitiligo Diseases 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- XCJYREBRNVKWGJ-UHFFFAOYSA-N copper(II) phthalocyanine Chemical compound [Cu+2].C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 XCJYREBRNVKWGJ-UHFFFAOYSA-N 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- ADFPJHOAARPYLP-UHFFFAOYSA-N methyl 2-methylprop-2-enoate;styrene Chemical compound COC(=O)C(C)=C.C=CC1=CC=CC=C1 ADFPJHOAARPYLP-UHFFFAOYSA-N 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound 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
- 239000000049 pigment Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002102 polyvinyl toluene Polymers 0.000 description 1
- 239000001062 red colorant Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920001909 styrene-acrylic polymer Polymers 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G9/00—Developers
- G03G9/08—Developers with toner particles
- G03G9/09—Colouring agents for toner particles
- G03G9/0902—Inorganic compounds
Description
【発明の詳細な説明】
本発明は、電子写真、静電記録等における静電
潜像を現像するための電子写真用トナーに関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic toner for developing electrostatic latent images in electrophotography, electrostatic recording, and the like.
電子写真用乾式現像剤は、トナー単独の１成分
現像剤とキヤリアを含有する２成分現像剤に分け
られる。２成分現像剤は適量のトナーを安定供給
できるという利点を有するが、トナーのスリーブ
付着が発生するという問題点がある。スリーブ付
着を防止する方法としては、トナー粒子の表面に
平均１次粒径が100ｍμないし1μの導電性酸化亜
鉛を付着させる方法が知られている。この方法
は、トナーの抵抗制御もしくは荷電制御により、
連続コピー中のトナー荷電量の蓄積を防止するも
のである。しかしこの方法ではスリーブ付着を完
全に防止することが困難であり、現像剤中に酸化
亜鉛の凝集体が生じて画像に白斑が発生する。ま
たブレードクリーニング方式の複写機において
は、感光体表面に決定的な損傷が生じたり、ブラ
ツクスポツトが発生する。さらに前記の酸化亜鉛
を添加してもトナーの流動性を向上させることは
なく、逆にトナーの流動性を悪化させるという欠
点を有している。本発明者はこれらの欠点を解消
するため研究を進めた結果、酸化亜鉛の１次粒径
が大きいと連続コピー中に酸化亜鉛がトナー粒子
の表面から脱離し易くなり、スリーブ付着が発生
すること、及び特定粒径の酸化亜鉛を用いること
により、トナー粒子表面からの脱離が著しく減少
し、トナーのスリーブ付着を防止できることを見
出した。 Dry developers for electrophotography are divided into one-component developers containing only toner and two-component developers containing carrier. Two-component developers have the advantage of being able to stably supply an appropriate amount of toner, but have the problem of toner adhesion to the sleeve. As a method for preventing sleeve adhesion, a method is known in which conductive zinc oxide having an average primary particle size of 100 μm to 1 μm is deposited on the surface of toner particles. This method uses toner resistance control or charge control to
This prevents toner charge from accumulating during continuous copying. However, with this method, it is difficult to completely prevent sleeve adhesion, and zinc oxide aggregates are formed in the developer, resulting in white spots on the image. Further, in a blade cleaning type copying machine, permanent damage or black spots occur on the surface of the photoreceptor. Furthermore, even if the above-mentioned zinc oxide is added, the fluidity of the toner is not improved, but on the contrary, it has the disadvantage of deteriorating the fluidity of the toner. As a result of conducting research to eliminate these drawbacks, the present inventor found that when the primary particle size of zinc oxide is large, zinc oxide easily detaches from the surface of toner particles during continuous copying, causing sleeve adhesion. It has been found that by using zinc oxide having a specific particle size, detachment from the toner particle surface is significantly reduced, and toner adhesion to the sleeve can be prevented.
本発明は、この知見に基づくもので、結着剤樹
脂及び着色剤を主成分として含有する粉体の表面
に平均１次粒径が80ｍμ以下であつて、体積固有
抵抗が8000Ωcm以下の超微粉状導電性酸化亜鉛を
付着せしめたことを特徴とする電子写真用トナー
である。 The present invention is based on this knowledge, and the surface of the powder containing a binder resin and a coloring agent as main components has an ultra-fine particles with an average primary particle size of 80 mμ or less and a volume resistivity of 8000 Ωcm or less. This is an electrophotographic toner characterized by adhering powdered conductive zinc oxide.
本発明に用いられる導電性酸化亜鉛は、平均１
次粒径が80ｍμ以下、体積固有抵抗が8000Ωcm
（測定圧力100Kg／cm2）以下である。平均１次粒径
が80ｍμより大きいと、トナーのスリーブへの付
着を完全に防止することができず、感光体へのト
ナー付着、感光体表面の損傷及び画像の白斑現象
を生ずる。また体積抵抗が8000Ωcmより大きい
と、トナーのスリーブへの付着を防止することが
できない。平均１次粒径が80ｍμ以下、体積固有
抵抗が8000Ωcm以下の導電性酸化亜鉛としては、
通常は市販の製品が用いられる。 The conductive zinc oxide used in the present invention has an average of 1
Secondary particle size is 80mμ or less, volume resistivity is 8000Ωcm
(measured pressure 100Kg/cm 2 ) or less. If the average primary particle size is larger than 80 mμ, it is not possible to completely prevent toner from adhering to the sleeve, resulting in toner adhesion to the photoreceptor, damage to the surface of the photoreceptor, and white spots on the image. Further, if the volume resistance is greater than 8000 Ωcm, it is impossible to prevent toner from adhering to the sleeve. As conductive zinc oxide with an average primary particle size of 80 mμ or less and a volume resistivity of 8000 Ωcm or less,
Commercially available products are usually used.
結着剤樹脂としては天然樹脂、半合成樹脂、合
成樹脂のいずれでもよく、例えばポリスチレン、
ポリビニルトルエンなどのスチレン又はその誘導
体の単独重合体、スチレン−アクリル酸メチル共
重合体、スチレン−メタクリル酸メチル共重合体
などのスチレン−アクリル系共重合体、ポリメチ
ルメタクリレート、ポリエステルなどが用いられ
る。 The binder resin may be any natural resin, semi-synthetic resin, or synthetic resin, such as polystyrene,
Homopolymers of styrene or its derivatives such as polyvinyltoluene, styrene-acrylic copolymers such as styrene-methyl acrylate copolymers, styrene-methyl methacrylate copolymers, polymethyl methacrylate, polyesters, etc. are used.
着色剤としては例えばカーボンブラツク、ベン
ガラ、酸化チタン、フアースト・エローＧ、ピグ
メントオレンジＲ、フタロシアニンブルー、フタ
ロシアニングリーンなどが用いられる。 As the colorant, for example, carbon black, red iron oxide, titanium oxide, Fast Yellow G, Pigment Orange R, phthalocyanine blue, phthalocyanine green, etc. are used.
本発明のトナーは、帯電制御剤例えば含金アゾ
染料、ニグロシンなどを含有していることが好ま
しい。 The toner of the present invention preferably contains a charge control agent such as a metal-containing azo dye or nigrosine.
本発明のトナーを製造するに際しては、結着剤
樹脂に着色剤及び必要に応じ帯電制御剤を加えて
溶融混練する。各成分の配合割合は、結着剤樹脂
100重量部に対して着色剤１〜20重量部、帯電制
御剤0.1〜５重量部とすることが好ましい。次い
で混合物を冷却し、粉砕、分級し、平均粒径３〜
20μの粉体とする。 When producing the toner of the present invention, a colorant and, if necessary, a charge control agent are added to the binder resin, and the mixture is melt-kneaded. The blending ratio of each component is the binder resin.
It is preferable to use 1 to 20 parts by weight of the colorant and 0.1 to 5 parts by weight of the charge control agent per 100 parts by weight. The mixture is then cooled, pulverized and classified to an average particle size of 3-
Make a powder of 20μ.
こうして得られた粉体に対して、平均１次粒径
が80ｍμ以下であつて、体積固有抵抗が8000Ωcm
以下の超微粉状導電性酸化亜鉛0.01〜10重量％好
ましくは0.1〜３重量部を添加し、均一に混合す
ると目的のトナーが得られる。このトナーは疎水
性シリカを0.01〜５重量％の割合で含有していて
もよい。 The powder thus obtained has an average primary particle size of 80 mμ or less and a volume resistivity of 8000 Ωcm.
The following ultrafine powder conductive zinc oxide is added in an amount of 0.01 to 10% by weight, preferably 0.1 to 3 parts by weight, and mixed uniformly to obtain the desired toner. This toner may contain hydrophobic silica in a proportion of 0.01 to 5% by weight.
本発明のトナーは、結着剤樹脂と着色剤を主成
分とする粒体の表面に、超微粒状導電性酸化亜鉛
が付着しており、酸化亜鉛の脱離がきわめて少な
い。このためこのトナーを用いると２成分現像剤
のスリーブ付着を完全に防止することができる。
また酸化亜鉛凝集体の生成がほとんど無いため、
画像に白斑が発生せず、しかも感光体の決定的な
損傷及びブラツクスポツトの発生が無く、トナー
の流動性も良好である。 In the toner of the present invention, ultrafine electrically conductive zinc oxide is attached to the surface of particles mainly composed of a binder resin and a colorant, and detachment of zinc oxide is extremely small. Therefore, when this toner is used, it is possible to completely prevent the two-component developer from adhering to the sleeve.
In addition, since there is almost no formation of zinc oxide aggregates,
There are no white spots on the image, no definitive damage to the photoreceptor, no black spots, and the toner has good fluidity.
下記例中の体積固有抵抗は、試料10ｇを内径約
25mmのシリンダーに入れ、油圧機により100Kg／
cm2に加圧し、そのときの試料の厚さ及び電気抵抗
を測定し、下記式により算出した。 The volume resistivity in the example below is based on a 10g sample with an inner diameter of approx.
Put it in a 25mm cylinder and use a hydraulic machine to weigh 100Kg/
The thickness and electrical resistance of the sample at that time were measured and calculated using the following formula.
体積固有抵抗＝Ｓ・Ｒ／Ｌ
式中のＬは試料の厚さ（cm）、Ｓはシリンダー
の内面積（4.91cm2）、Ｒは電気抵抗（Ω）を意味
する。 Volume resistivity=S·R/L In the formula, L means the thickness of the sample (cm), S means the inner area of the cylinder (4.91 cm 2 ), and R means the electrical resistance (Ω).
実施例 １
スチレン−ブチルアクリレート共重合体90重量
部、低分子量ポリプロピレン３重量部、カーボン
ブラツク５重量部及び含金染料（帯電制御剤）２
重量部を充分に予備分散させたのち、バンバリー
ミキサーで溶融混練した。この混合物を冷却した
のち、ジエツトミル微粉砕機で微粉砕し、分級す
ると平均粒径11.4μの粉体が得られた。この粉体
に対して平均１次粒径約15ｍμ、体積固有抵抗約
7000Ωcmの導電性酸化亜鉛0.5重量％を添加し、
高速撹拌機で均一に混合してトナーを得た。この
トナー４重量部をフエライト100重量部と混合し
て現像剤を調製し、この現像剤を乾式複写機
（PC：Seブレードクリーニング方式）に入れ、５
万枚の連続コピーを行つたところ、スリーブ付着
及び決定的なドラムの損傷、ブラツクスポツト、
画像の白斑等は全く認められなかつた。また下記
の方法で測定したトナーの流動性は0.24ｇ／10秒
であつた。Example 1 90 parts by weight of styrene-butyl acrylate copolymer, 3 parts by weight of low molecular weight polypropylene, 5 parts by weight of carbon black, and 2 parts by weight of metal-containing dye (charge control agent)
After sufficiently predispersing parts by weight, the mixture was melt-kneaded using a Banbury mixer. After cooling this mixture, it was pulverized using a jet mill and classified to obtain a powder with an average particle size of 11.4 μm. For this powder, the average primary particle diameter is approximately 15 mμ, and the volume resistivity is approximately
Added 0.5% by weight of conductive zinc oxide of 7000Ωcm,
A toner was obtained by uniformly mixing with a high-speed stirrer. A developer is prepared by mixing 4 parts by weight of this toner with 100 parts by weight of ferrite, and this developer is put into a dry copying machine (PC: Se blade cleaning method).
After continuous copying of 10,000 copies, sleeve adhesion, permanent damage to the drum, black spots,
No vitiligo was observed in the image. The fluidity of the toner measured by the method described below was 0.24 g/10 seconds.
トナーの流動性の測定：バウダーテスター（細
川ミクロン研究所製PT−Ｅ型）を用い、トナー
20ｇを100メツシユのフルイの上にのせ、パウダ
ーテスターのRHEOSTAT目盛を４にして10秒
間フルイを振動させ、10秒後のフルイに残つたト
ナーの重量を測定する。フルイ残存量が少ないト
ナーほど流動性が良いと判定される。 Measurement of toner fluidity: Using a border tester (Model PT-E manufactured by Hosokawa Micron Institute),
Place 20g on a 100 mesh sieve, set the powder tester's RHEOSTAT scale to 4, vibrate the sieve for 10 seconds, and measure the weight of the toner remaining on the sieve after 10 seconds. It is determined that the toner having a smaller amount remaining in the sieve has better fluidity.
実施例 ２
実施例１で得られた平均粒径11.4μの粉体に対
して平均１次粒径約80ｍμ、体積固有抵抗約1000
Ωcmの導電性酸化亜鉛1.5重量％を添加し、実施
例１と同様にしてトナー及び現像剤を調製した。
この現像剤を実施例１と同じ複写機に入れて５万
枚の連続コピーを行つたところ、実施例１と同様
に良好な結果が得られた。なおトナーの流動性は
0.40ｇ／10秒であつた。Example 2 Compared to the powder with an average particle diameter of 11.4μ obtained in Example 1, the average primary particle diameter was approximately 80 mμ, and the volume resistivity was approximately 1000.
A toner and a developer were prepared in the same manner as in Example 1 except that 1.5% by weight of conductive zinc oxide of Ωcm was added.
When this developer was placed in the same copying machine as in Example 1 and 50,000 sheets were continuously copied, the same good results as in Example 1 were obtained. The fluidity of the toner is
It was 0.40g/10 seconds.
実施例 ３
実施例１のトナーに疎水性シリカを0.3重量％
添加し、その他は実施例１と同様にしてトナー及
び現像剤を調製した。この現像剤を実施例１と同
じ複写機に入れて５万枚の連続コピーを行つたと
ころ、実施例１と同様に良好な結果が得られた。
なおトナーの流動性は0.17ｇ／10秒であつた。Example 3 0.3% by weight of hydrophobic silica in the toner of Example 1
A toner and a developer were prepared in the same manner as in Example 1. When this developer was placed in the same copying machine as in Example 1 and 50,000 sheets were continuously copied, the same good results as in Example 1 were obtained.
The fluidity of the toner was 0.17 g/10 seconds.
実施例 ４
スチレン−メタクリレート−ブチルアクリレー
ト共重合体90重量％、低分子量ポリプロピレン３
重量部、赤色着色剤（SPILON RED GRCH）
５重量部及び帯電制御剤（BONTRON Ｐ−51）
２重量部を実施例１と同様に処理し、平均粒径
7.8μの赤色粉体を得た。この粉体に対して平均１
次粒径約40ｍμ、体積固有抵抗約5000Ωcmの酸化
亜鉛1.0重量％及び疎水性シリカ0.4重量％を添加
し、高速撹拌機で均一に混合して赤色トナーを得
た。次いで赤色トナー５重量部を弗素被覆フエラ
イトキヤリア100重量部と混合して現像剤を調製
した。この現像剤を乾式複写機（感光体：OPC、
グレードクリーニング方式）に入れて５万枚の連
続コピーをしたところ、実施例１と同様の結果が
得られた。なおトナーの流動性は0.68ｇ／10秒で
あつた。Example 4 Styrene-methacrylate-butyl acrylate copolymer 90% by weight, low molecular weight polypropylene 3
Parts by weight, red colorant (SPILON RED GRCH)
5 parts by weight and charge control agent (BONTRON P-51)
2 parts by weight were treated in the same manner as in Example 1, and the average particle size was
A red powder of 7.8μ was obtained. On average 1 for this powder
1.0% by weight of zinc oxide and 0.4% by weight of hydrophobic silica having a secondary particle size of about 40 mμ and a volume resistivity of about 5000 Ωcm were added and mixed uniformly with a high-speed stirrer to obtain a red toner. A developer was then prepared by mixing 5 parts by weight of red toner with 100 parts by weight of a fluorine-coated ferrite carrier. This developer is applied to a dry copying machine (photoreceptor: OPC,
The same results as in Example 1 were obtained when 50,000 sheets were continuously copied using the grade cleaning method). The fluidity of the toner was 0.68 g/10 seconds.
実施例 ５
実施例４で得られた平均粒径7.8μの赤色粉末に
対して実施例２と同様の酸化亜鉛1.5重量％及び
疎水性シリカ0.4重量％を添加し、高速撹拌機で
均一に混合して赤色トナーを得た。このトナー４
重量部をフエライト100重量部と混合して現像剤
を調製した。この現像剤を実施例４と同じ複写機
に入れて５万枚の連続コピーを行つたところ、実
施例１と同様の結果が得られた。なおトナーの流
動性は1.03ｇ／10秒であつた。Example 5 1.5% by weight of zinc oxide and 0.4% by weight of hydrophobic silica as in Example 2 were added to the red powder with an average particle size of 7.8μ obtained in Example 4, and mixed uniformly with a high-speed stirrer. A red toner was obtained. This toner 4
A developer was prepared by mixing parts by weight with 100 parts by weight of ferrite. When this developer was placed in the same copying machine as in Example 4 and 50,000 copies were made continuously, the same results as in Example 1 were obtained. The fluidity of the toner was 1.03 g/10 seconds.
比較例 １
導電性酸化亜鉛を除き、その他は実施例３と同
様にしてトナー及び現像剤を調製した。この現像
剤を実施例１と同じ複写機に入れ、連続コピー試
験を行つた。その結果、約1500枚でスリーブ付着
が発生した。しかし５万枚コピーしても感光体の
決定的な損傷、ブラツクスポツト、画像の白斑は
認められなかつた。なお、トナーの流動性は0.3
ｇ／10秒であつた。Comparative Example 1 A toner and a developer were prepared in the same manner as in Example 3 except for the conductive zinc oxide. This developer was placed in the same copying machine as in Example 1, and a continuous copying test was conducted. As a result, sleeve adhesion occurred on approximately 1,500 sheets. However, even after copying 50,000 copies, no definitive damage to the photoreceptor, no black spots, and no white spots on the images were observed. Furthermore, the fluidity of the toner is 0.3
g/10 seconds.
比較例 ２
酸化亜鉛として平均１次粒径150ｍμの粉体を
用い、その他は実施例１と同様にしてトナー及び
現像剤を調製した。この現像剤を実施例１と同じ
複写機に入れて４万枚の連続コピーを行つたとこ
ろ、約２万枚コピーしたところでスリーブ付着が
発生し、画像濃度の低下及びカブリの増加が認め
られた。また４万枚後の画像には感光体のキズに
よる白スジ及び酸化亜鉛凝集体が転写されること
により発生した小さな白斑が認められた。なおト
ナーの流動性は1.6ｇ／10秒であつた。Comparative Example 2 A toner and a developer were prepared in the same manner as in Example 1 except that zinc oxide powder having an average primary particle size of 150 mμ was used. When this developer was placed in the same copying machine as in Example 1 and 40,000 sheets were continuously copied, sleeve adhesion occurred after approximately 20,000 copies were made, and a decrease in image density and an increase in fog were observed. . Furthermore, after 40,000 copies, white streaks due to scratches on the photoreceptor and small white spots caused by transfer of zinc oxide aggregates were observed. The fluidity of the toner was 1.6 g/10 seconds.
比較例 ３
酸化亜鉛として平均１次粒径800ｍμの粉体用
い、その他は実施例４と同様にしてトナー及び現
像剤を調製した。この現像剤を実施例４と同じ複
写機に入れて連続コピーを行つた。その結果、約
１万枚コピーしたところでスリーブ付着が発生
し、画像濃度の低下及びカブリの増加が認められ
た。また２万枚後の画像には、感光体のキズによ
る白スジ、ブラツクスポツト及び白斑が発生し
た。なお流動性は3.4ｇ／10秒であつた。Comparative Example 3 A toner and a developer were prepared in the same manner as in Example 4 except that zinc oxide was a powder having an average primary particle size of 800 mμ. This developer was placed in the same copying machine as in Example 4 and continuous copying was performed. As a result, sleeve adhesion occurred after approximately 10,000 copies were made, and a decrease in image density and an increase in fog were observed. In addition, white streaks, black spots, and white spots due to scratches on the photoreceptor appeared in the image after 20,000 copies. Note that the fluidity was 3.4 g/10 seconds.
Claims (1)
る粉体の表面に、平均１次粒径が80ｍμ以下であ
つて、体積固有抵抗が8000Ωcm以下の超微粉状導
電性酸化亜鉛を付着せしめたことを特徴とする電
子写真用トナー。1. Ultrafine conductive zinc oxide powder with an average primary particle size of 80 mμ or less and a volume resistivity of 8000 Ωcm or less is adhered to the surface of a powder containing a binder resin and a colorant as main components. An electrophotographic toner characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63101399A JPH01273056A (en) | 1988-04-26 | 1988-04-26 | Toner for electrophotography |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63101399A JPH01273056A (en) | 1988-04-26 | 1988-04-26 | Toner for electrophotography |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01273056A JPH01273056A (en) | 1989-10-31 |
| JPH0432382B2 true JPH0432382B2 (en) | 1992-05-29 |
Family
ID=14299657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63101399A Granted JPH01273056A (en) | 1988-04-26 | 1988-04-26 | Toner for electrophotography |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01273056A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0816787B2 (en) * | 1988-06-20 | 1996-02-21 | シャープ株式会社 | Electrophotographic toner |
| JP3168375B2 (en) * | 1994-06-14 | 2001-05-21 | キヤノン株式会社 | Electrostatic image developing toner and image forming method |
| JP4605382B2 (en) * | 2005-10-26 | 2011-01-05 | セイコーエプソン株式会社 | Negatively chargeable toner and method for producing the same |
| JP4605383B2 (en) * | 2005-10-26 | 2011-01-05 | セイコーエプソン株式会社 | Negatively chargeable toner and method for producing the same |
| JP4461169B2 (en) | 2007-12-06 | 2010-05-12 | シャープ株式会社 | Color toner, developer, developing device, and image forming apparatus |
| WO2014132900A1 (en) * | 2013-02-27 | 2014-09-04 | 日本ゼオン株式会社 | Electrostatic-charged image developer |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53120435A (en) * | 1977-03-29 | 1978-10-20 | Mita Industrial Co Ltd | Magnetic developing agent |
| JPS59105652A (en) * | 1982-12-09 | 1984-06-19 | Konishiroku Photo Ind Co Ltd | Toner for developing electrostatic charge image |
| JPS59168460A (en) * | 1983-03-15 | 1984-09-22 | Canon Inc | Electrophotographic developer |
| JPS604949A (en) * | 1983-06-22 | 1985-01-11 | Minolta Camera Co Ltd | Magnetic developer |
-
1988
- 1988-04-26 JP JP63101399A patent/JPH01273056A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53120435A (en) * | 1977-03-29 | 1978-10-20 | Mita Industrial Co Ltd | Magnetic developing agent |
| JPS59105652A (en) * | 1982-12-09 | 1984-06-19 | Konishiroku Photo Ind Co Ltd | Toner for developing electrostatic charge image |
| JPS59168460A (en) * | 1983-03-15 | 1984-09-22 | Canon Inc | Electrophotographic developer |
| JPS604949A (en) * | 1983-06-22 | 1985-01-11 | Minolta Camera Co Ltd | Magnetic developer |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01273056A (en) | 1989-10-31 |
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