JPH02101475A - Electrophotographic toner - Google Patents
Electrophotographic tonerInfo
- Publication number
- JPH02101475A JPH02101475A JP63253860A JP25386088A JPH02101475A JP H02101475 A JPH02101475 A JP H02101475A JP 63253860 A JP63253860 A JP 63253860A JP 25386088 A JP25386088 A JP 25386088A JP H02101475 A JPH02101475 A JP H02101475A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- fluidity
- cleaning
- particle size
- powder
- 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
- 239000000843 powder Substances 0.000 claims abstract description 57
- 239000002245 particle Substances 0.000 claims abstract description 55
- 238000004140 cleaning Methods 0.000 claims abstract description 25
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 12
- 239000000057 synthetic resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 7
- 239000011347 resin Substances 0.000 claims abstract description 7
- 239000000654 additive Substances 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 6
- 239000003086 colorant Substances 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims 1
- 238000003860 storage Methods 0.000 abstract description 11
- 230000002708 enhancing effect Effects 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 37
- 239000000377 silicon dioxide Substances 0.000 description 18
- 230000002209 hydrophobic effect Effects 0.000 description 11
- 229920001577 copolymer Polymers 0.000 description 8
- 229910002012 Aerosil® Inorganic materials 0.000 description 7
- 108091008695 photoreceptors Proteins 0.000 description 6
- 239000006229 carbon black Substances 0.000 description 5
- -1 ethylene, propylene, butylene Chemical group 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000049 pigment Substances 0.000 description 5
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 5
- 239000004926 polymethyl methacrylate Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 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 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 239000004793 Polystyrene Substances 0.000 description 3
- 241000519995 Stachys sylvatica Species 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 2
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 235000010724 Wisteria floribunda Nutrition 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 150000004696 coordination complex Chemical class 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- FJKIXWOMBXYWOQ-UHFFFAOYSA-N ethenoxyethane Chemical compound CCOC=C FJKIXWOMBXYWOQ-UHFFFAOYSA-N 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229920002050 silicone resin Polymers 0.000 description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- UZKWTJUDCOPSNM-UHFFFAOYSA-N 1-ethenoxybutane Chemical compound CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 description 1
- WQMWHMMJVJNCAL-UHFFFAOYSA-N 2,4-dimethylpenta-1,4-dien-3-one Chemical compound CC(=C)C(=O)C(C)=C WQMWHMMJVJNCAL-UHFFFAOYSA-N 0.000 description 1
- SBYMUDUGTIKLCR-UHFFFAOYSA-N 2-chloroethenylbenzene Chemical compound ClC=CC1=CC=CC=C1 SBYMUDUGTIKLCR-UHFFFAOYSA-N 0.000 description 1
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical compound O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 229920000147 Styrene maleic anhydride Polymers 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical class C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- IRERQBUNZFJFGC-UHFFFAOYSA-L azure blue Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Na+].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[S-]S[S-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-].[O-][Si]([O-])([O-])[O-] IRERQBUNZFJFGC-UHFFFAOYSA-L 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- GMSCBRSQMRDRCD-UHFFFAOYSA-N dodecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCOC(=O)C(C)=C GMSCBRSQMRDRCD-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- UIWXSTHGICQLQT-UHFFFAOYSA-N ethenyl propanoate Chemical compound CCC(=O)OC=C UIWXSTHGICQLQT-UHFFFAOYSA-N 0.000 description 1
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 239000006233 lamp black Substances 0.000 description 1
- PBOSTUDLECTMNL-UHFFFAOYSA-N lauryl acrylate Chemical compound CCCCCCCCCCCCOC(=O)C=C PBOSTUDLECTMNL-UHFFFAOYSA-N 0.000 description 1
- MOUPNEIJQCETIW-UHFFFAOYSA-N lead chromate Chemical compound [Pb+2].[O-][Cr]([O-])(=O)=O MOUPNEIJQCETIW-UHFFFAOYSA-N 0.000 description 1
- 229940002712 malachite green oxalate Drugs 0.000 description 1
- XJRBAMWJDBPFIM-UHFFFAOYSA-N methyl vinyl ether Chemical compound COC=C XJRBAMWJDBPFIM-UHFFFAOYSA-N 0.000 description 1
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000005673 monoalkenes Chemical class 0.000 description 1
- HILCQVNWWOARMT-UHFFFAOYSA-N non-1-en-3-one Chemical compound CCCCCCC(=O)C=C HILCQVNWWOARMT-UHFFFAOYSA-N 0.000 description 1
- 229940065472 octyl acrylate Drugs 0.000 description 1
- ANISOHQJBAQUQP-UHFFFAOYSA-N octyl prop-2-enoate Chemical compound CCCCCCCCOC(=O)C=C ANISOHQJBAQUQP-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 125000000962 organic group Chemical group 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- UCUUFSAXZMGPGH-UHFFFAOYSA-N penta-1,4-dien-3-one Chemical class C=CC(=O)C=C UCUUFSAXZMGPGH-UHFFFAOYSA-N 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- WRAQQYDMVSCOTE-UHFFFAOYSA-N phenyl prop-2-enoate Chemical compound C=CC(=O)OC1=CC=CC=C1 WRAQQYDMVSCOTE-UHFFFAOYSA-N 0.000 description 1
- 229940099800 pigment red 48 Drugs 0.000 description 1
- 229920002285 poly(styrene-co-acrylonitrile) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229940051201 quinoline yellow Drugs 0.000 description 1
- 235000012752 quinoline yellow Nutrition 0.000 description 1
- IZMJMCDDWKSTTK-UHFFFAOYSA-N quinoline yellow Chemical compound C1=CC=CC2=NC(C3C(C4=CC=CC=C4C3=O)=O)=CC=C21 IZMJMCDDWKSTTK-UHFFFAOYSA-N 0.000 description 1
- 239000004172 quinoline yellow Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229940081623 rose bengal Drugs 0.000 description 1
- 229930187593 rose bengal Natural products 0.000 description 1
- STRXNPAVPKGJQR-UHFFFAOYSA-N rose bengal A Natural products O1C(=O)C(C(=CC=C2Cl)Cl)=C2C21C1=CC(I)=C(O)C(I)=C1OC1=C(I)C(O)=C(I)C=C21 STRXNPAVPKGJQR-UHFFFAOYSA-N 0.000 description 1
- VDNLFJGJEQUWRB-UHFFFAOYSA-N rose bengal free acid Chemical compound OC(=O)C1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1C1=C2C=C(I)C(=O)C(I)=C2OC2=C(I)C(O)=C(I)C=C21 VDNLFJGJEQUWRB-UHFFFAOYSA-N 0.000 description 1
- FZHAPNGMFPVSLP-UHFFFAOYSA-N silanamine Chemical group [SiH3]N FZHAPNGMFPVSLP-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- KOZCZZVUFDCZGG-UHFFFAOYSA-N vinyl benzoate Chemical compound C=COC(=O)C1=CC=CC=C1 KOZCZZVUFDCZGG-UHFFFAOYSA-N 0.000 description 1
- XOSXWYQMOYSSKB-LDKJGXKFSA-L water blue Chemical compound CC1=CC(/C(\C(C=C2)=CC=C2NC(C=C2)=CC=C2S([O-])(=O)=O)=C(\C=C2)/C=C/C\2=N\C(C=C2)=CC=C2S([O-])(=O)=O)=CC(S(O)(=O)=O)=C1N.[Na+].[Na+] XOSXWYQMOYSSKB-LDKJGXKFSA-L 0.000 description 1
- 239000001993 wax Substances 0.000 description 1
- 230000037303 wrinkles Effects 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
- G03G9/097—Plasticisers; Charge controlling agents
- G03G9/09708—Inorganic compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- 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、静電潜像を現像するための電子写真トナーに
関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to electrophotographic toners for developing electrostatic latent images.
従来の技術
従来、電子写真用現像剤しては、ポリスチレン、スチレ
ン−ブタジェン共重合体、ポリエステル等の樹脂類にカ
ーボンブラック、フタロシアニンブルー等の顔料又は染
料を着色剤として使用し、溶融混練後、 １μｍから３
０ｐｍに粉砕して１７られだトナーと、キャリアとして
平均粒径かトナーの粒径とほぼ同じか、ないしは５００
／／ｍまでのガラスピーズ、鉄、ニッケル、フエライｉ
〜等の粒子、市るいはこれ等に種々の樹脂を被覆したも
のとを混ぜ合わせたものが一般に用いられている。BACKGROUND OF THE INVENTION Conventionally, electrophotographic developers use resins such as polystyrene, styrene-butadiene copolymers, and polyesters, and pigments or dyes such as carbon black and phthalocyanine blue as coloring agents, and after melt-kneading, 1 μm to 3
The toner is crushed to 0 pm and the average particle size is approximately the same as the toner particle size, or 500 pm is used as the carrier.
Glass beads, iron, nickel, ferrite up to //m
Particles such as .
ところで、電子写真現像剤を用いて感光体上の静電潜像
を現像し、転写した後、感光体表面にはトナーが残留す
るか、この残留トナーは、クリーニング工程においてブ
レード法、ブラシ法、ウェブ法、ロール法等種々の手段
によってクリーニングされる。クリーニングか良好に行
われないと、筋状の汚れ等を生じ画質を劣化ざぜるのて
、従来、クリーニング不良が生じないように、クリーニ
ング助剤として合成樹脂粉末をトナーに外添するこ、と
が行われている。By the way, after the electrostatic latent image on the photoreceptor is developed and transferred using an electrophotographic developer, toner remains on the surface of the photoreceptor, and this residual toner is removed by the blade method, brush method, or cleaning method in the cleaning process. Cleaning is performed by various means such as web method and roll method. If cleaning is not performed properly, streaks of dirt may occur and image quality deteriorates. Conventionally, synthetic resin powder is externally added to toner as a cleaning aid to prevent cleaning defects. is being carried out.
一方、トナーの保存性、流動性を改善するために、無機
微粉末を外添することも知られており、通常粒径２０
ｍμＲ１稈度のシリカ微粉末か使用されている。On the other hand, in order to improve the storage stability and fluidity of toner, it is also known to externally add inorganic fine powder, which usually has a particle size of 20
Fine silica powder with mμR1 culmness is used.
発明が解決しようとする課題
ところで、クリーニング性を改善するために合成樹脂粉
末を外添すると、トナーの保存性、流動性は改善されな
い。一方、保存性、流動性を改善するために無機微粉末
を外添すると、クリーニング不良による感光体上へのト
ナー固着が生じ、その為、コピー上に白描け、黒投げが
発生する。この白扱け、黒扱けの発生は、外添担が多く
なればなるほど、著しくなる。Problems to be Solved by the Invention However, when synthetic resin powder is externally added to improve cleaning properties, the storage stability and fluidity of the toner are not improved. On the other hand, when inorganic fine powder is externally added to improve storage stability and fluidity, toner sticks to the photoreceptor due to poor cleaning, resulting in white spots and black spots on copies. This phenomenon of being treated as white and being treated as black becomes more pronounced as the number of outsiders increases.
この問題を解消するためには、外添剤として合成樹脂粉
末と無機微粉末とを併用すればよいが、トナーの保存性
、流動性が改善される量の無機微粉末を外添すると、コ
ピー上に白摸けや黒扱けが発生し、合成樹脂微粉末の外
添効果が発揮しにくく、一方、合成樹脂粉末の添加効果
を発揮させるために、無機微粉末の使用孕を減じると、
トナーの保存性、流動性が改善されなくなるという問題
があった。In order to solve this problem, synthetic resin powder and inorganic fine powder can be used together as external additives, but if the inorganic fine powder is added in an amount that improves the storage stability and fluidity of the toner, it is possible to copy On the other hand, if the amount of inorganic fine powder used is reduced in order to make the synthetic resin powder more effective,
There is a problem that the storage stability and fluidity of the toner cannot be improved.
本発明は、従来の技術における上記のような問題点に鑑
みてなされたものである。The present invention has been made in view of the above-mentioned problems in the conventional technology.
したがって、本発明の目的は、クリーニング性に優れ、
かつ保存性、流動性が優れ、多数枚の複写にも安定した
画質の画像を得ることができる電子写真トナーを提供す
ることにある。Therefore, the object of the present invention is to have excellent cleaning properties,
Another object of the present invention is to provide an electrophotographic toner that has excellent storage stability and fluidity, and is capable of producing images of stable image quality even when a large number of copies are made.
課題を解決するための手段
本発明者等は、上記従来の技術における問題点は、シリ
カ等の無機微粉末よりなる流動性付与剤の粒径を所定の
値に設定すると解決されることを見出だし、本発明を完
成するに至った。Means for Solving the Problems The present inventors have found that the problems in the above-mentioned conventional techniques can be solved by setting the particle size of the fluidity imparting agent made of inorganic fine powder such as silica to a predetermined value. From the beginning, we have completed the present invention.
本発明の電子写真トナーは、少なくとも結着樹脂及び着
色剤を含有するトナー粒子よりなり、そして、外添剤と
して、合成樹脂粉末よりなるクリーング助剤、及び粒径
１０ ｍ仮以下の無機微粉末よりなる流動性付与剤を添
加してなることを特徴とする。The electrophotographic toner of the present invention consists of toner particles containing at least a binder resin and a colorant, and as external additives a cleaning aid made of synthetic resin powder and an inorganic fine powder with a particle size of 10 m or less. It is characterized by the addition of a fluidity imparting agent.
以下、本発明について詳記する。The present invention will be described in detail below.
本発明の電子写真トナーにおいて、外添剤として使用さ
れる合成樹脂粉末よりなるクリーニング助剤としては、
ポリフッ化ビニリデン、ポリメチルメタクリレート、ポ
リスチレン等の粉末があげられる。In the electrophotographic toner of the present invention, cleaning aids made of synthetic resin powder used as external additives include:
Examples include powders of polyvinylidene fluoride, polymethyl methacrylate, polystyrene, and the like.
これ等合成樹脂粉末は、粒径０．１〜１．Ｏｊ１！ｆ１
に設定される。またその添加量は、０．１〜２重量％の
範囲が適当である。These synthetic resin powders have a particle size of 0.1 to 1. Oj1! f1
is set to Moreover, the addition amount is suitably in the range of 0.1 to 2% by weight.
本発明において、無機微粉末よりなる流動性付与剤とし
ては、シリカ、酸化アルミニウム、酸化チタン等の微粉
末があげられる。この中でも特にシリカ微粉末が好まし
く用いられる。シリカ微粉末としては、シリカ微粒子そ
のもの、又は、特公昭５４−１６２１９号公報に記載さ
れているごときケイ素−炭素結合によって直接にケイ素
に結合されている１〜３個の有機基を有するケイ素原子
がケイ素−酸素−ケイ素結合を介して化学的に結合した
、表面ケイ素原子を有する二酸化ケイ素粒子があげられ
る。シリカ微粒子は疎水性表面処理が施されていてもよ
い。更に、シランカップリング剤、チタネートカップリ
ング剤等で処理が施されていてもよい。In the present invention, examples of the fluidity imparting agent made of inorganic fine powder include fine powders of silica, aluminum oxide, titanium oxide, and the like. Among these, fine silica powder is particularly preferably used. The silica fine powder may be silica fine particles themselves or silicon atoms having 1 to 3 organic groups directly bonded to silicon through a silicon-carbon bond as described in Japanese Patent Publication No. 16219/1982. Examples include silicon dioxide particles having surface silicon atoms chemically bonded via silicon-oxygen-silicon bonds. The silica fine particles may be subjected to a hydrophobic surface treatment. Furthermore, it may be treated with a silane coupling agent, a titanate coupling agent, or the like.
本発明においてこれ等無機微粉末は粒径が１０ｍμｍ以
下でおることが必要でおる。粒径が１０ｍμｍよりも大
きくなると、クリーニング不良に基づく汚れが発生し、
画質の劣化した画像が生じる。無機微粉末の添加量は、
粒径等に依存し、−概に規定できないが、約０．０１〜
５重母％、好ましくは約０．１〜２重量％程度に設定さ
れる。In the present invention, it is necessary that these inorganic fine powders have a particle size of 10 mm or less. When the particle size is larger than 10 mμm, stains occur due to poor cleaning,
An image with degraded quality is produced. The amount of inorganic fine powder added is
Depends on particle size, etc. - cannot be generally specified, but about 0.01~
It is set at about 5% by weight, preferably about 0.1 to 2% by weight.
又、本発明においてトナー粒子としては、公知のものが
使用される。このトナー粒子に使用される結着樹脂とし
ては、スチレン、クロロスチレン等のスチレン類、エチ
レン、プロピレン、ブチレン、イソプレン等のモノオレ
フィン、酢酸ビニル、プロピオン酸ビニル、安息香酸ビ
ニル、酢酸ビニル等のビニルエステル、アリクル酸メチ
ル、アクリル酸エチル、アクリル酸ブチル、アクリル酸
ドデシル、アクリル酸オクチル、アクリル酸フェニル、
メタクリル酸メチル、メタクリル酸エチル、メタクリル
酸ブチル、メタクリル酸ドデシル等のα−メチレン脂肪
族モノカルボン酸エステル、ビニルメチルエーテル、ビ
ニルエチルエーテル、ビニルブチルエーテル等のビニル
エーテル、ビニルメチルクートン、ビニルへキシルケト
ン、ビニルイソプロペニルケトン等のビニルケトン等の
単独重合体あるいは共重合体を例示することができ、特
に代表的な結着樹脂としては、ポリスチレン、スチレン
−アクリル酸アルキル共重合体、スチレン−メタクリル
酸アルキル共重合体、スチレン−アクリロニトリル共重
合体、スチレン−ブタジェン共重合体、スチレン−無水
マレイン酸共重合体、ポリエチレン、ポリプロピレンを
めげることができる。Further, in the present invention, known toner particles can be used. Binder resins used in the toner particles include styrenes such as styrene and chlorostyrene, monoolefins such as ethylene, propylene, butylene, and isoprene, and vinyl such as vinyl acetate, vinyl propionate, vinyl benzoate, and vinyl acetate. Esters, methyl acrylate, ethyl acrylate, butyl acrylate, dodecyl acrylate, octyl acrylate, phenyl acrylate,
α-methylene aliphatic monocarboxylic acid esters such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, dodecyl methacrylate, vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, vinyl butyl ether, vinyl methyl couptone, vinyl hexyl ketone, vinyl Examples include homopolymers or copolymers of vinyl ketones such as isopropenyl ketone, and particularly representative binder resins include polystyrene, styrene-alkyl acrylate copolymers, and styrene-alkyl methacrylate copolymers. Polymers such as styrene-acrylonitrile copolymers, styrene-butadiene copolymers, styrene-maleic anhydride copolymers, polyethylene, and polypropylene can be used.
更に、ポリエステル、ポリウレタン、エポキシ樹脂、シ
リコン樹脂、ポリアミド、変性ロジン、パラフィン、ワ
ックス類を必げることかできる。Additionally, polyesters, polyurethanes, epoxy resins, silicone resins, polyamides, modified rosins, paraffins, and waxes can be included.
又、トナーの着色剤としては、カーボンブラック、ニグ
ロシン染料、アニリンブルー、カルコイルブルー、クロ
ムイエロー、ウルトラマリンブルーデュポンオイルレッ
ド、キノリンイエローメチレンブルークロリド、フタロ
シアニンブルーマラカイトグリーンオキサレート、ラン
プブラック、ローズベンガル、 Ｃ，１，ピグメント・
レッド４８：１ 、Ｃ，１，ピグメント・レッド１２２
、Ｃ，１，ピグメント・レッド５７ 、Ｃ，１，ピグメ
ント・イエロー９７ 、Ｃ，１，ピグメント・イエロー
１２ 、Ｃ，１，ピグメント・ブルー１５：１、Ｃ６■
、ピグメント・ブルー１５：３ 、等を代表的なものと
して例示することができる。In addition, toner coloring agents include carbon black, nigrosine dye, aniline blue, calcoyl blue, chrome yellow, ultramarine blue DuPont oil red, quinoline yellow methylene blue chloride, phthalocyanine blue malachite green oxalate, lamp black, rose bengal, C, 1, pigment
Red 48:1, C,1, Pigment Red 122
, C,1, Pigment Red 57, C,1, Pigment Yellow 97, C,1, Pigment Yellow 12, C,1, Pigment Blue 15:1, C6■
, Pigment Blue 15:3, etc. can be exemplified as representative examples.
なお、本発明において、結着樹脂及び着色剤は上記の例
示したものに限定されるものではない。In the present invention, the binder resin and colorant are not limited to those exemplified above.
上記トナー粒子には、更に公知の帯電制御剤、オフセッ
ト防止剤或いは磁性材料が含まれていてもよい。The toner particles may further contain a known charge control agent, anti-offset agent, or magnetic material.
本発明において、トナー粒子は、約３０μｍより小さく
、好ましくは３〜２０μｍの平均粒径を有するものを用
いることができる。In the present invention, toner particles having an average particle size of less than about 30 μm, preferably from 3 to 20 μm can be used.
本発明の電子写真トナーは、キャリアとトナーとを有す
る、いわゆる二成分現像剤として用いられることが望ま
しいが、磁性体を添加分散ざぜて通當の一成分型トナー
として使用することもできる。The electrophotographic toner of the present invention is preferably used as a so-called two-component developer comprising a carrier and a toner, but it can also be used as a one-component toner by adding and dispersing a magnetic material.
キャリア粒子としては、平均粒径が５００ｐｍまでの粒
子であり、鉄、ニッケル、コバルト、酸化鉄、フェライ
ト、ガラスピーズ、粒状シリコン等、公知の種々のもの
か用いられる。The carrier particles have an average particle diameter of up to 500 pm, and various known particles such as iron, nickel, cobalt, iron oxide, ferrite, glass beads, and granular silicon can be used.
また、これ等粒子の表面をフッ素系樹脂、アクリル系樹
脂、シリコン樹脂などの被覆剤で被覆してもＪ：い。Furthermore, the surfaces of these particles may be coated with a coating agent such as a fluororesin, an acrylic resin, or a silicone resin.
作用
本発明の電子写真トナーをキャリア粒子と混合して、電
子写真感光体おるいは静電記録体に形成された静電潜像
を現像すると、高温高湿から低温低湿までのあらゆる環
境の下で、クリーニング不良に基づく汚れを発生するこ
とがなく、かつ保存性、流動性が優れ、多数枚の複写に
も安定した画質の画像を得ることができる。その理由と
しては、無機微粉末の粒径が小さい為に、合成樹脂粉末
粒子が無機微粉末によって覆われることがなく、トナー
粒子表面に露出した状態で付着していることによるもの
と推測される。また、無機微粉末の粒径が小さい為に、
保存性、流動性を改善するために必要な量か少なくてよ
くなり、したがって無機微粉末によるトナー粒子の摩１
寮帯電刊の環境依存性も小さくなる。Function: When the electrophotographic toner of the present invention is mixed with carrier particles to develop an electrostatic latent image formed on an electrophotographic photoreceptor or an electrostatic recording medium, it can be used under any environment from high temperature and high humidity to low temperature and low humidity. Therefore, it does not cause stains due to poor cleaning, has excellent storage stability and fluidity, and can obtain images with stable image quality even when making multiple copies. The reason for this is presumed to be that because the particle size of the inorganic fine powder is small, the synthetic resin powder particles are not covered by the inorganic fine powder and are attached to the toner particle surface in an exposed state. . In addition, because the particle size of the inorganic fine powder is small,
In order to improve storage stability and fluidity, a smaller amount is required, and therefore the abrasion of toner particles by inorganic fine powder is less.
The environmental dependence of Dormitory Charge Publishing will also be reduced.
実施例 以下、本発明を実施例により異体的に説明する。Example Hereinafter, the present invention will be explained in detail with reference to Examples.
実施例１
スチレン−ｎ−ブチルメダ ９２重量部クリレー
ト共重合体（７０／３０）
（）ｌｎ＝約７，０００ 、 Ｍｗ＝約４０．０００）
カーボンブラック ６車量部クロム系
金属錯体 ２重量部上記成分を溶融混練
後、微粉砕し、分級して平均粒径１２μｍの微粉末を得
た。Example 1 Styrene-n-butylmeda 92 parts by weight acrylate copolymer (70/30) ()ln=about 7,000, Mw=about 40.000)
Carbon black: 6 parts by weight Chromium-based metal complex: 2 parts by weight The above components were melted and kneaded, then finely pulverized and classified to obtain a fine powder with an average particle size of 12 μm.
この微粉末１００重量部に対し、疎水性シリカ（Ｒ８１
２、日本アエロジル社製、−次粒子径７ｍμｍ）０．４
重量部、及びポリメチルメタクリレート微粉末（粒径的
０．３３μｍ）０．５重量部を加え、高速混合機によっ
て混合して、トナーを得た。このトナーの粉体圧縮率は
３４％と小さく、良好な流動性を示した。なお、粉体圧
縮率の測定は、パウダーテスタ（細円ミクロン社製）を
用いて行った。Hydrophobic silica (R81
2. Manufactured by Nippon Aerosil Co., Ltd., -order particle size 7 mμm) 0.4
Parts by weight and 0.5 parts by weight of polymethyl methacrylate fine powder (particle size: 0.33 μm) were added and mixed using a high-speed mixer to obtain a toner. This toner had a small powder compressibility of 34% and exhibited good fluidity. Note that the powder compressibility was measured using a powder tester (manufactured by Hoisen Micron Co., Ltd.).
粒径的１００７ｆｆｌのフエライｉ〜に、メチルメタク
リレート−スチレン共重合体を被覆したキャリア１００
重量部に対し、上記トナー３重量部を混合し、現像剤を
得た。Carrier 100 coated with methyl methacrylate-styrene copolymer on Ferrai i~ with a particle size of 1007 ffl
3 parts by weight of the above toner were mixed with each part by weight to obtain a developer.
この現像剤を用い、複写機（ＦＸ４７００． ｓ±ゼロ
ックス（１１）によってコピーテストを行ったところ高
温高湿（３０℃、８５％ＲＨ）から低温低湿（１０℃、
１５％ＲＨ）までの条件下で、クリーニング不良に基づ
く汚れのない優れた画質の画像が得られた。Using this developer, we conducted a copy test using a copying machine (FX4700.s ±
Images of excellent quality were obtained under conditions of up to 15% RH) without stains due to poor cleaning.
更にｉｏ、ｏｏｏ枚の連続複写を行ったところ、画質の
変化は殆ど認められなかった。Furthermore, when io and ooo copies were made continuously, almost no change in image quality was observed.
実施例２
実施例１において、疎水性シリカ（、Ｒ８１２）０．４
Ｉｉ串部の代わりに、疎水性シリカ（Ｒ９７Ｂ、日本ア
エロジル社製、−次粒子径７ｍＩＩｍ）０．４重量部を
、またポリメチルメタクリレート微粉末の代わりにポリ
フッ化ビニリデン微粉末（粒径的０．３７ｆｆｌ）を用
いた以外は、実施例１と同様にしてトナーを得た。Example 2 In Example 1, hydrophobic silica (R812) 0.4
In place of the Ii skewer, 0.4 parts by weight of hydrophobic silica (R97B, manufactured by Nippon Aerosil Co., Ltd., particle size 7 mIIm) was added, and in place of the polymethyl methacrylate fine powder, polyvinylidene fluoride fine powder (particle size 0) was added. A toner was obtained in the same manner as in Example 1, except that .37ffl) was used.
なお、このトナーの粉体圧縮率は３３％と小ざく、良好
な流動性を示した。The powder compressibility of this toner was as low as 33%, and it exhibited good fluidity.
実施例１におけると同様にして現像剤を調製し、同様に
コピーテストを行ったところ、高温高湿から低温低湿ま
での条件下で優れた画質の画像が得られた。更にｉｏ、
ｏｏｏ枚の連続複写を行ったところ、画質の変化は殆ど
認められなかった。A developer was prepared in the same manner as in Example 1, and a copy test was conducted in the same manner as in Example 1. Images of excellent quality were obtained under conditions ranging from high temperature and high humidity to low temperature and low humidity. Furthermore, io,
When ooo copies were made continuously, almost no change in image quality was observed.
実施例３
スチレン−ｎ−ブチルメタ ９２重量部クリレー
ト共重合体（７０／３０）
（Ｈｎ＝約７，０００ 、 Ｍｗ−約４０．０００）カ
ーボンブラック ６重量部クロム系金
属錯体 ２重量部上記成分を溶融混練
後、微粉砕し、分級して平均粒径８μｍの微粉末を得た
。Example 3 Styrene-n-butylmeth 92 parts by weight Acrylate copolymer (70/30) (Hn = about 7,000, Mw - about 40.000) Carbon black 6 parts by weight Chromium-based metal complex 2 parts by weight The above components After melt-kneading, the mixture was finely pulverized and classified to obtain a fine powder with an average particle size of 8 μm.
この微粉末１００重量部に対し、疎水性シリカ（Ｒ８１
２、日本アエロジル社製、−次粒子径７ｍμｍ）０．６
重量部、及びポリメチルメタクリレート微粉末（粒径的
０．３１μｍ）０．５重量部を加え、高速混合機によっ
て混合して、トナーを得た。このトナーの粉体圧縮率は
３５％と小ざく、良好な流動性を示した。Hydrophobic silica (R81
2. Manufactured by Nippon Aerosil Co., Ltd., -order particle size 7 mμm) 0.6
Parts by weight and 0.5 parts by weight of polymethyl methacrylate fine powder (particle size: 0.31 μm) were added and mixed using a high-speed mixer to obtain a toner. The powder compressibility of this toner was as low as 35%, and it exhibited good fluidity.
粒径的１１００ｊＩのフェライトに、メチルメタクリレ
ート−スチレン共重合体を被覆したキャリア１００重量
部に対し、上記トナー３重量部を混合し、現像剤を得た
。A developer was obtained by mixing 3 parts by weight of the above toner with 100 parts by weight of a carrier prepared by coating methyl methacrylate-styrene copolymer on ferrite having a particle diameter of 1100 jI.
この現像剤を用い、複写機（ＦＸ４７００． Ｍ士ゼロ
ックス■製）によってコピーテストを行ったところ高温
高湿から低温低湿までの条件下で、クリーニング不良に
基づく汚れのない優れた画質の画像が得られた。Using this developer, we conducted a copy test using a copying machine (FX4700, manufactured by Xerox Corporation) and found that images of excellent quality without stains caused by poor cleaning were obtained under conditions ranging from high temperature and high humidity to low temperature and low humidity. It was done.
更にｉｏ、ｏｏｏ枚の連続複写を行ったところ、画質の
変化は殆ど認められなかった。Furthermore, when io and ooo copies were made continuously, almost no change in image quality was observed.
実施例４
スチレン−ｎ−ブチルメタ ９２重量部クリレー
ト共重合体（７０／３０）
（）ｌｎ＝約７，０００ 、Ｈｗ＝約４０．０００）カ
ーボンブラック ６重量部帯電制御剤
（ボントロンＰ５１
オリエント化学性１製） ２重量部上記成分
を溶融混練後、微粉砕し、分級して平均粒径１２μｍの
微粉末を得た。Example 4 Styrene-n-butylmeth 92 parts by weight Acrylate copolymer (70/30) (ln=about 7,000, Hw=about 40,000) Carbon black 6 parts by weight Charge control agent (Bontron P51 Orient Chemical 1) 2 parts by weight of the above components were melt-kneaded, finely pulverized, and classified to obtain a fine powder with an average particle size of 12 μm.
この微粉末１００重量部に対し、疎水性シリカ（Ｒ８１
２、日本アエロジル社製、−次粒子径７ｍμｌ１１）を
第４級アミノシランで処理した変性シリカ０．４重量部
及びポリメチルメタクリレート微粉末（粒径的０．３．
μｓ）０．５重量部を加え、高速混合機によって混合し
て、トナーを得た。このトナーの粉体圧縮率は３５％と
小さく、良好な流動性を示した。Hydrophobic silica (R81
2. Nippon Aerosil Co., Ltd., 0.4 parts by weight of modified silica treated with quaternary aminosilane and polymethyl methacrylate fine powder (particle size 0.3.
μs) 0.5 parts by weight was added and mixed using a high speed mixer to obtain a toner. This toner had a small powder compressibility of 35% and exhibited good fluidity.
粒径的１００ ｐｍのフェライトに、メチルメタクリレ
ート−スチレン共重合体を被覆したキサリア１００重最
部に対し、上記トナー３重量部を混合し、現像剤を得た
。A developer was obtained by mixing 3 parts by weight of the above toner with the outermost part of Kissaria 100, which is made of ferrite having a particle size of 100 pm and coated with a methyl methacrylate-styrene copolymer.
この現像剤を用い、複写機（ＦＸ４７００、富士ゼロッ
クス■製）によってコピーテストを行ったところ、高温
高湿から低温低湿までの条件下で、クリーング不良に基
づく汚れのない優れた画質の画像が得られた。When we conducted a copy test using this developer using a copying machine (FX4700, manufactured by Fuji Xerox ■), we were able to obtain images of excellent quality with no stains caused by poor cleaning under conditions ranging from high temperature and high humidity to low temperature and low humidity. It was done.
更に１０，０００枚の連続複写を行ったところ、画質の
変化は殆ど認められなかった。When 10,000 further copies were made continuously, almost no change in image quality was observed.
比較例１
実施例１において、疎水性シリカ（Ｒ８１２）０．４重
印部の代わりに、疎水性シリカ（Ｒ９７２、日本アエロ
ジル社製、−次粒子径１６ ｍ＃ｌ）０．８重量部を用
いた以外は、実施例１と同様にしてトナーを得た。Comparative Example 1 In Example 1, 0.8 parts by weight of hydrophobic silica (R972, manufactured by Nippon Aerosil Co., Ltd., -order particle size 16 m#l) was used instead of the 0.4 double marked part of hydrophobic silica (R812). A toner was obtained in the same manner as in Example 1, except for the following.
なお、このトナーの粉体圧縮率は３２％と小さく、良好
な流動性を示した。しかしながら、実施例１にあけると
同様にして現像剤を調製し、同様にコピーテストを行っ
たところ、低温低湿下において、感光体のクリーニング
不良と思われる筋状の汚れが生じた。The powder compressibility of this toner was as low as 32%, indicating good fluidity. However, when a developer was prepared in the same manner as in Example 1 and a copy test was conducted in the same manner, streak-like stains appeared at low temperature and low humidity, which appeared to be due to poor cleaning of the photoreceptor.
比較例２
実施例１において、疎水性シリカ（Ｒ８１２）０．４重
量部の代わりに、疎水性シリカ（Ｒ９７２、日本アエロ
ジル社製、−次粒子径１６ ｍ廓）０．４重量部を用い
た以外は、実施例１と同様にしてトナーをｊｑた。Comparative Example 2 In Example 1, 0.4 parts by weight of hydrophobic silica (R972, manufactured by Nippon Aerosil Co., Ltd., -order particle size 16 m) was used instead of 0.4 parts by weight of hydrophobic silica (R812). Except for this, the toner was prepared in the same manner as in Example 1.
このトナーの粉体圧縮率は４３％と大ぎく、流動性はよ
くなかった。The powder compressibility of this toner was as high as 43%, and the fluidity was poor.
実施例１におけると同様にして現像剤を調製し、同様に
コピーテストを行ったところ、高温高湿下においてトナ
ーディスペンス但が不足し、トナー濃度低下のため像濃
度が低下した。また、トナーボックスと現像機の間にお
いてトナーの塊が発生した。A developer was prepared in the same manner as in Example 1, and a copy test was conducted in the same manner. As a result, toner dispensing was insufficient under high temperature and high humidity conditions, resulting in a decrease in image density due to a decrease in toner concentration. In addition, toner lumps were generated between the toner box and the developing machine.
比較例３
実施例１において、疎水性シワ力（Ｒ８１２）０．４重
量部の代わりに、疎水性シリカ（Ｒ８１１、日本アエロ
ジル社製、−次粒子径１２ ｍ１Ｉ７１）０．６重Φ部
を用いた以外は、実施例１と同様にしてトナーを得た。Comparative Example 3 In Example 1, 0.6 parts by weight of hydrophobic silica (R811, manufactured by Nippon Aerosil Co., Ltd., -order particle size 12 m1I71) was used instead of 0.4 parts by weight of hydrophobic wrinkle strength (R812). A toner was obtained in the same manner as in Example 1, except for the following.
このトナーの粉体圧縮率は３４％と小さく、良好な流動
性を示した。This toner had a small powder compressibility of 34% and exhibited good fluidity.
しかしながら、実施例１と同様にして現像剤を調製し、
同様にコピーテストを行ったところ、クリーニング不良
による白扱はヤ黒央けが発生した。However, a developer was prepared in the same manner as in Example 1,
When a copy test was conducted in the same manner, it was found that the white paper had some dark spots due to poor cleaning.
これ等の結果を第１表に示す。These results are shown in Table 1.
以下余白
発明の効果
本発明の電子写真トナーは、上記のように、合成樹脂粉
末と共に粒径１０ ｍμｍ以下の小径無機微粉末を外添
するから、通常粒径の無機微粉末を使用した場合に比べ
、同等の保存性、流動性を有するようにするのに必要な
無機微粉末のｄが少なくてすみ、そのため、コピー上の
白扱けや黒扱けの程度が減少する。 また、従来と同量
添加した場合においても、その理由は明らかではないカ
ベ通常粒径の無機微粉末を外添した場合に比べて、コピ
ー上の白抜はヤ黒央けの程度が軽い。Effects of the Invention In the electrophotographic toner of the present invention, as described above, small-diameter inorganic fine powder with a particle size of 10 mμm or less is externally added together with the synthetic resin powder. In comparison, less d of the inorganic fine powder is required to have the same shelf life and fluidity, and therefore the degree of whiteness and blackness on copies is reduced. Furthermore, even when the same amount as before is added, the degree of white spots on copies is lighter than when inorganic fine powder with a normal particle size is externally added, the reason for which is not clear.
特に、粒径１０μｍ以下の小粒径トナーにおいては、保
存性、流動性或いは転写性を、通常粒径の１〜ナーなみ
に改善するには、より多くの無機微粉末の外添が必要に
なり、コピー上の白抜け、黒央けの程度がよりひどくな
るが、本発明においては、小粒径無機微粉末の使用によ
り、白抜け、黒央けの問題が軽減できる。In particular, for small particle size toners with a particle size of 10 μm or less, it is necessary to externally add more inorganic fine powder in order to improve the storage stability, fluidity, or transferability to the same level as the normal particle size of 1 to 1 toner. However, in the present invention, by using a small particle size inorganic fine powder, the problems of white spots and dark spots can be alleviated.
また、本発明の電子写真トナーを、キャリアと混合して
静電潜像を現像すると、感光体のクリ−ニング不良に基
づく汚れが発生せず、多数枚の複写にも安定した画質を
得ることができる。また、無機微粉末の使用量も少なく
なるため、摩擦帯電量の環境依存性も小さくなり、高温
高湿から低温低湿までのあらゆる環境下で安定した現像
性を示す。Further, when the electrophotographic toner of the present invention is mixed with a carrier to develop an electrostatic latent image, stains due to poor cleaning of the photoreceptor do not occur, and stable image quality can be obtained even when making many copies. Can be done. Furthermore, since the amount of inorganic fine powder used is reduced, the environmental dependence of the amount of triboelectric charge is also reduced, and stable developability is exhibited under all environments from high temperature and high humidity to low temperature and low humidity.
特許出願人 冨士ゼロックス株式会社代理人
弁理士 眼部 剛Patent applicant Fuji Xerox Co., Ltd. Agent
Patent attorney Tsuyoshi Eyebe
Claims (1)
粒子よりなる電子写真トナーにおいて、外添剤として、
合成樹脂粉末よりなるクリーニング助剤、及び粒径１０
ｍμｍ以下の無機微粉末よりなる流動性付与剤を添加し
たことを特徴とする電子写真トナー。(1) In an electrophotographic toner consisting of toner particles containing at least a binder resin and a colorant, as an external additive,
Cleaning aid made of synthetic resin powder and particle size 10
An electrophotographic toner characterized in that a fluidity imparting agent made of inorganic fine powder of mμm or less is added.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63253860A JPH02101475A (en) | 1988-10-11 | 1988-10-11 | Electrophotographic toner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63253860A JPH02101475A (en) | 1988-10-11 | 1988-10-11 | Electrophotographic toner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02101475A true JPH02101475A (en) | 1990-04-13 |
Family
ID=17257138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63253860A Pending JPH02101475A (en) | 1988-10-11 | 1988-10-11 | Electrophotographic toner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02101475A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01177579A (en) * | 1988-01-08 | 1989-07-13 | Konica Corp | Image forming method |
-
1988
- 1988-10-11 JP JP63253860A patent/JPH02101475A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01177579A (en) * | 1988-01-08 | 1989-07-13 | Konica Corp | Image forming method |
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