JPH02267566A - Developer for reversal development - Google Patents
Developer for reversal developmentInfo
- Publication number
- JPH02267566A JPH02267566A JP1088082A JP8808289A JPH02267566A JP H02267566 A JPH02267566 A JP H02267566A JP 1088082 A JP1088082 A JP 1088082A JP 8808289 A JP8808289 A JP 8808289A JP H02267566 A JPH02267566 A JP H02267566A
- Authority
- JP
- Japan
- Prior art keywords
- toner
- developer
- reversal development
- specific
- ferrite carrier
- 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.)
- Granted
Links
- 238000011161 development Methods 0.000 title claims abstract description 15
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 18
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 12
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000011347 resin Substances 0.000 abstract description 13
- 229920005989 resin Polymers 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- -1 acrylic ester Chemical class 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000975 dye Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 108091008695 photoreceptors Proteins 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000012798 spherical particle Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 241000282326 Felis catus Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 241000907663 Siproeta stelenes Species 0.000 description 1
- 241000270708 Testudinidae Species 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 125000003277 amino group Chemical group 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
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229920006026 co-polymeric resin Polymers 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 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
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000004898 kneading Methods 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
- 239000000314 lubricant Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 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
- 229960000907 methylthioninium chloride Drugs 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 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
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 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
- 229940051201 quinoline yellow Drugs 0.000 description 1
- 239000004172 quinoline yellow Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 235000013799 ultramarine blue Nutrition 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
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は電子写真法、静電記録法あるいは静電印刷法等
で形成した静電像を現像するのに用いるキャリアとトナ
ーよりなる反転現像用現像剤に関する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a reversal developing system comprising a carrier and toner used to develop an electrostatic image formed by electrophotography, electrostatic recording, electrostatic printing, or the like. This invention relates to a developer.
一般に電子写真用複写機においては、原稿像と同じ像を
感光体上に形成する正転現像法が使用されている。しか
しながら、近年、原稿像に対して反転した反転画像を感
光体上に形成する反転現像法も使用されるようになり、
この方法は主にプリンターに採用されている。Generally, in electrophotographic copying machines, a forward development method is used in which an image identical to the original image is formed on a photoreceptor. However, in recent years, a reversal development method that forms a reversed image on a photoreceptor, which is the reverse of the original image, has also come into use.
This method is mainly used in printers.
一般に反転現像法を使用した負極性トナー用現像剤は次
の様にして現像される。まず、メインチャージャーによ
って感光体表面を負極性に一様に帯電させ、その感光体
表面をレザー光等を画線状に照射することにより照射部
の電荷を除去し、潜像低部電位まで電位を低下させる。Generally, a negative polarity toner developer using a reversal development method is developed in the following manner. First, the surface of the photoreceptor is uniformly charged to negative polarity by the main charger, and the surface of the photoreceptor is irradiated with laser light, etc. in an image pattern to remove the charge on the irradiated area, and the potential reaches the potential of the lower part of the latent image. decrease.
このようにして、井戸型ポテンシャルの潜像を形成し、
現像器に負極性の現像バイアスを印加することによって
露光された井戸型ポテンシャルの潜像部に負極性トナー
を現像せしめる。In this way, a latent image of a well type potential is formed,
By applying a negative developing bias to the developing device, negative toner is developed on the exposed latent image portion of the well type potential.
このような原理に基づいた反転プリンターでは、現像剤
の電気抵抗が高いと、現像バイアスがかかり易くなり、
非潜像部へのトナー付着が少なくトナー消費量の増加が
抑制されるが、その反面、画像濃度の低下、エツジ効果
による画線部の先後端欠けが発生し、画像の品質を低下
させる問題があった。また、逆に現像剤の電気抵抗が低
いと画像濃度は出易いが、現像バイアスがかかりにくく
なリ、非潜像部へのトナー付着のためトナー消費量が増
加する等の問題があった。In reversing printers based on this principle, if the electrical resistance of the developer is high, development bias is likely to be applied.
This reduces the adhesion of toner to non-latent image areas and suppresses the increase in toner consumption, but on the other hand, it causes a decrease in image density and chipping at the leading and trailing edges of image areas due to edge effects, which degrades image quality. was there. On the other hand, if the electrical resistance of the developer is low, the image density can be easily obtained, but there are problems such as difficulty in applying a developing bias and an increase in toner consumption due to toner adhesion to non-latent image areas.
したがってプリンター用の反転現像用現像剤には上記の
相反する性質を具備する必要があり、そのための手段と
して従来の技術ではキャリアの粒径を小さくした高抵抗
キャリアを用いる方法が一般的である。この方法によれ
ば、高抵抗キャリアを使用することで非潜像部のトナー
付着を無（し、トナー消費量の増加を抑制する。更に粒
径の小さなキャリアを使用することで現像剤中のトナー
濃度を高くし、画像濃度を高くすることによりエツジ効
果による画線部の先後端欠けの発生を抑制しようとして
いた。しかしながら、このような従来の方法では転写紙
上へのキャリアの付着（以下キャリアあがりと称する）
が発生しやすくなり、更にトナー濃度が高くなる為、現
像器周辺のトナー飛散や地力ブリが発生する等の問題が
あった。Therefore, it is necessary for a developer for reversal development for printers to have the above-mentioned contradictory properties, and as a means for achieving this, a common method in the prior art is to use a high-resistance carrier with a small carrier particle size. According to this method, by using a high-resistance carrier, toner adhesion in non-latent image areas is eliminated and an increase in toner consumption is suppressed.Furthermore, by using a carrier with a small particle size, the amount of toner in the developer is reduced. Attempts have been made to suppress the occurrence of chipping at the leading and trailing edges of the image area due to the edge effect by increasing the toner density and image density.However, with these conventional methods, the adhesion of carrier onto the transfer paper (referred to as ``Agari'')
This tends to occur, and the toner concentration also increases, causing problems such as toner scattering and ground blurring around the developing device.
〔発明が解決しようとする課題〕
本発明は上記の問題に鑑みてなされたものであり、鮮明
な画質で地力ブリが少なく、且つトナー消費量が少ない
新規な反転現像用現像剤を提供することにある。[Problems to be Solved by the Invention] The present invention has been made in view of the above problems, and it is an object of the present invention to provide a new developer for reversal development that has clear image quality, less ground blur, and consumes less toner. It is in.
本発明の要旨は、酸化マグネシウムを５〜１５モル％含
有し、且つ電気抵抗が２×１０８〜３×ｌＯ９Ω・口の
フェライトキャリアと、電気抵抗が９×１０８Ω・１以
上であるトナーからなることを特徴とする反転現像用現
像剤である。The gist of the present invention is to consist of a ferrite carrier containing 5 to 15 mol% of magnesium oxide and having an electrical resistance of 2 x 108 to 3 x lO9 Ω, and a toner having an electrical resistance of 9 x 108 Ω or more. This is a developer for reversal development characterized by:
以下本発明の詳細な説明する。The present invention will be explained in detail below.
本発明の現像剤を構成するフェライトキャリアは、ＭＯ
・Ｐｅ５ｏｚ （但しＭは２価の金属イオン）なる組
成を有する鉄酸化物において、酸化マグネシウム（Ｍｇ
Ｏ）を５Ｘ１５モル％含有するものであり、ＭｇＯとＦ
ｅ！０３以外に適宜他の金属酸化物すなわち、ＮｉＯ＋
Ｂａｄ、 ＭｎＯ，Ｃｕｂ、 Ｃｏｏ、 ＺｎＯ等を
含有するものである。The ferrite carrier constituting the developer of the present invention is MO
・In iron oxide with the composition Pe5oz (where M is a divalent metal ion), magnesium oxide (Mg
It contains 5 x 15 mol% of MgO and F
e! In addition to 03, other metal oxides, ie, NiO+
It contains Bad, MnO, Cub, Coo, ZnO, etc.
また、上記フェライトキャリアは例えば次のように製造
される。すなわち、酸化第二鉄と酸化マグネシウム及び
その他の金属酸化物を所定の比率で混合し、８００〜１
０００℃で数時間仮焼し、次に粉砕し、その粉砕粉を必
要に応じてポリビニルアルコール等の粘結網を加えて加
熱雰囲気中で雲霧乾燥し球状粒子を得る。そして該球状
粒子を１１００〜１３００℃の温度で焼成してから分級
することによりフェライトキャリアを得ることができる
。Moreover, the above-mentioned ferrite carrier is manufactured, for example, as follows. That is, ferric oxide, magnesium oxide, and other metal oxides are mixed in a predetermined ratio, and 800 to 1
The resulting powder is calcined at 000° C. for several hours, then pulverized, and if necessary, a caking network such as polyvinyl alcohol is added to the pulverized powder, followed by fog drying in a heated atmosphere to obtain spherical particles. A ferrite carrier can be obtained by firing the spherical particles at a temperature of 1100 to 1300°C and then classifying them.
上記フェライトキャリア中の酸化マグネシウムの含有量
が５モル％未満の場合は現像剤の電気抵抗が必要以上に
高くなるために画像濃度の低下や先後端欠けが発生する
。一方、酸化マグネシウムの含有量が１５モル％を越え
ると電気抵抗が低くなりすぎてトナー消費量の増加や地
力ブリの発生がみられる。更に酸化マグネシウムの含有
量が１５モル％を越えると、フェライトキャリアの製造
時において、焼成温度を高（する必要があり、よって焼
成用の炉に高温に耐えうる材質のものを用いなければな
らない、このためフェライトキャリアの製造コストが高
くなるという欠点を有する。If the content of magnesium oxide in the ferrite carrier is less than 5 mol %, the electrical resistance of the developer becomes higher than necessary, resulting in a decrease in image density and chipping at the leading and trailing edges. On the other hand, if the content of magnesium oxide exceeds 15 mol %, the electrical resistance becomes too low, resulting in an increase in toner consumption and the occurrence of ground braking. Furthermore, if the content of magnesium oxide exceeds 15 mol%, it is necessary to increase the firing temperature during the production of the ferrite carrier, and therefore the firing furnace must be made of a material that can withstand high temperatures. This has the disadvantage that the manufacturing cost of the ferrite carrier increases.
また、本発明を構成するフェライトキャリアは電気抵抗
が２Ｘ１０＠〜３Ｘ１０’Ω・ｃｍの範囲でなければな
らず、２Ｘ１０＠Ω・１未満の場合であると転写紙上へ
のキャリアあがりが発生しやすくなり、３Ｘ１０’Ω・
１を越えると画像濃度の低下がみられる。In addition, the ferrite carrier constituting the present invention must have an electrical resistance in the range of 2X10@ to 3X10'Ω・cm, and if it is less than 2X10@Ω・1, the carrier tends to rise onto the transfer paper. 3X10'Ω・
When it exceeds 1, a decrease in image density is observed.
本発明におけるフェライトキャリアの電気抵抗は次のよ
うにして測定する。すなわち、フェライトキャリアを温
度が２２〜２５℃、湿度が５０〜５４％ＲＨの環境条件
に１５分間放置し、その後キャリアをセルに充てんし、
２５０ｖの直流電圧を印加して電気抵抗を求める。The electrical resistance of the ferrite carrier in the present invention is measured as follows. That is, the ferrite carrier is left in an environmental condition with a temperature of 22 to 25 ° C. and a humidity of 50 to 54% RH for 15 minutes, and then the carrier is filled into the cell,
A DC voltage of 250 V is applied to determine the electrical resistance.
本発明でいうフェライトキャリアは上記の如き特定の組
成と電気抵抗ｃｍのものを下記に述べる高抵抗のトナー
と組合せて使用するので、その表面に樹脂被覆を施す必
要がなく従がって安価なキャリアとして使用することが
できる。The ferrite carrier referred to in the present invention has the above-mentioned specific composition and electric resistance cm and is used in combination with the high-resistance toner described below, so there is no need to coat the surface with a resin, and therefore it is inexpensive. Can be used as a carrier.
以下に本発明を構成するトナーについて詳述する。The toner constituting the present invention will be described in detail below.
本発明を構成するトナーは９×１０８Ω・ｃｍ以上の電
気抵抗を有する必要があり、トナーの電気抵抗が９×１
０８Ω・１未満であると地力ブリやトナー消費量が増加
するという問題を有する。この場合におけるトナーの電
気抵抗は次のようにして測定する。すなわち、トナーを
ペレット状物に成形し、該ペレット状物に電圧を印加し
該ペレ。The toner constituting the present invention must have an electrical resistance of 9 x 10 8 Ωcm or more, and the toner electrical resistance should be 9 x 1
If it is less than 0.08Ω·1, there will be problems such as ground braking and increased toner consumption. The electrical resistance of the toner in this case is measured as follows. That is, the toner is formed into a pellet-like material, and a voltage is applied to the pellet-like material to form the pellet.
ト状物のコンダクタンスを求める。そのコンダクタンス
から次式により電気抵抗が求められる。Find the conductance of the tortoise. Electrical resistance can be determined from the conductance using the following formula.
ρ：電気抵抗値
Ｇ：コンダクタンス
本発明において、トナーの電気抵抗を９×１０８Ω・Ｃ
−以上にする技術的手段としては、例えばトナー中に含
有させるカーボンブラックの量を減量するとか、電気抵
抗の高いカーボンブラックまたは結着樹脂を用いてトナ
ーを作製することにより可能である。ρ: electrical resistance value G: conductance In the present invention, the electrical resistance of the toner is 9×10 8 Ω・C
- Technical means for achieving the above can be achieved, for example, by reducing the amount of carbon black contained in the toner, or by producing the toner using carbon black or a binder resin with high electrical resistance.
また、本発明におけるトナーは結着樹脂、電荷制御剤、
着色剤及び必要に応じてその他の添加物を混合し、溶融
混練した後、冷却、固化後粉砕分級して得られる。Further, the toner in the present invention includes a binder resin, a charge control agent,
It is obtained by mixing a coloring agent and other additives as necessary, melting and kneading, cooling, solidifying, and then crushing and classifying.
以下に本発明におけるトナーに使用される材料について
詳述する。まず、結着樹脂としては、−般にトナー用結
着剤として使用されるものが使用可能である０例えばス
チレン樹脂、ポリアクリル酸エステル樹脂、スチレン−
アクリル酸エステル共重合体樹脂、ポリ塩化ビニル樹脂
、ポリ酢酸ビニル樹脂、ポリ塩化ビニルデン樹脂、フェ
ノール樹脂、エポキシ樹脂、ポリエステル樹脂等が挙げ
られる。また、これらの樹脂はその目的に応じて１種類
とは限らず２種類以上の混合物として用いることが出来
る。The materials used for the toner in the present invention will be described in detail below. First, as the binder resin, those generally used as binders for toner can be used. For example, styrene resin, polyacrylate resin, styrene resin, etc.
Examples include acrylic ester copolymer resin, polyvinyl chloride resin, polyvinyl acetate resin, polyvinyl chloride resin, phenol resin, epoxy resin, and polyester resin. Furthermore, depending on the purpose, these resins are not limited to one type, but can be used as a mixture of two or more types.
電荷制御剤としては、ニグロシン系染料、四級アンモニ
ウム塩、含金属錯塩染料、Ｃａ、 Ｂａなどのチタネー
トあるいはカーボネート、アルコキシル化アミン、ナイ
ロン等各種ポリアミド系樹脂、アミノ基を含有する縮合
系ポリマー等のポリアミン樹脂等が所望するトナーの帯
電極性に応じて適宜選択して用いられる。Examples of charge control agents include nigrosine dyes, quaternary ammonium salts, metal-containing complex dyes, titanates or carbonates such as Ca and Ba, alkoxylated amines, various polyamide resins such as nylon, and condensation polymers containing amino groups. A polyamine resin or the like is appropriately selected and used depending on the desired charging polarity of the toner.
着色剤としては、任意の適当な顔料又は染料を用いるこ
とが出来る０例えばカーボンブランク、ニグロシン染料
、アニリンブルー、アルコイルブルー、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、フタロシアニンブルー、
マラカイトブルー、銅またはクロム等遷移金属を含む染
料等が挙げられる。As the coloring agent, any suitable pigment or dye can be used. For example, carbon blank, nigrosine dye, aniline blue, alcohol blue, chrome yellow, ultramarine blue DuPont oil red, quinoline yellow, methylene blue, phthalocyanine blue,
Examples include malachite blue, dyes containing transition metals such as copper or chromium, and the like.
また、必要に応じてトナーに配合されるその他の添加物
としては、潤滑剤、研摩剤、定着剤等の例えばポリテト
ラフルオロエチレン粉、高級脂肪酸の金属塩、酸化セリ
ウム、低分子量ポリエチレン、低分子量ポリプロピレン
等が挙げられる。Other additives that may be added to the toner as needed include lubricants, abrasives, fixing agents, etc., such as polytetrafluoroethylene powder, metal salts of higher fatty acids, cerium oxide, low molecular weight polyethylene, and low molecular weight Examples include polypropylene.
次に本発明を実施例により具体的に説明する。 Next, the present invention will be specifically explained using examples.
なお、本発明はその要旨をこえない限り以下の実施例に
限定されるものではない。It should be noted that the present invention is not limited to the following examples unless it exceeds the gist thereof.
（実施例１〜３及び比較例１〜３）
上記の配合の材料を混合し、ロールミルで溶融混練して
冷却後、ハンマーミルで粗粉砕した後更に超音速ジェッ
トミルで微粉砕後、分級して平均粒子径が１２μ霞、電
気抵抗が９×１０８Ω・ｃａｔのトナーを得た。(Examples 1 to 3 and Comparative Examples 1 to 3) The above-mentioned ingredients were mixed, melt-kneaded in a roll mill, cooled, coarsely pulverized in a hammer mill, finely pulverized in a supersonic jet mill, and then classified. A toner having an average particle diameter of 12 μm and an electrical resistance of 9×10 8 Ω·cat was obtained.
次に上記により得られたトナー６重量部に対して、第１
表に示すような組成による各々のフェライトキャリア１
００Ｍ量部とを混合して本発明による現像剤及び比較用
の現像剤を作製した。Next, for 6 parts by weight of the toner obtained above, the first
Each ferrite carrier 1 with the composition shown in the table
A developer according to the present invention and a comparative developer were prepared by mixing 00M parts.
（比較例４）
上記の配合の材料を混合し、ロールミルで溶融混練して
冷却後、ハンマーミルで粗粉砕した後更に超音速ジェッ
トミルで微粉砕後、分級して平均粒子径が１２μｍ、電
気抵抗が３×１ＯＩｏΩ・１のトナーを得た。(Comparative Example 4) The above-mentioned ingredients were mixed, melt-kneaded in a roll mill, cooled, coarsely pulverized in a hammer mill, finely pulverized in a supersonic jet mill, and classified to obtain an average particle size of 12 μm. A toner having a resistance of 3×1 OIoΩ·1 was obtained.
次に上記により得られたトナー６重量部に対して、下記
組成の平均粒子径が５０μ鴎、電気抵抗が２．４×１０
８であるフェライトキャリア１００重量部とを混合して
比較用の現像剤を作製した。Next, for 6 parts by weight of the toner obtained above, particles having the following composition with an average particle diameter of 50μ and an electrical resistance of 2.4×10
A comparative developer was prepared by mixing with 100 parts by weight of ferrite carrier No. 8.
以上の各実施例１〜３及び比較例１〜４で述べた二成分
現像剤を反転現像法を用いた反転プリンター（Ａ４サイ
ズでコピースピード８枚／分）に設置し、２万枚までの
連続複写耐久試験を行った。The two-component developer described in Examples 1 to 3 and Comparative Examples 1 to 4 above was installed in a reversal printer using a reversal development method (copy speed 8 sheets/min for A4 size), and it was possible to print up to 20,000 sheets. A continuous copy durability test was conducted.
第２表に２万枚後の画質、地力ブリ及びトナー消費量に
関する評価結果を示す。ここで、画質は転写画像を目視
により評価した。また、地力ブリは非画像部のカブリ濃
度を東京重色社製のフォトボルトメータにより測定し評
価を行った。その詳細な評価の判定基準は次のとおりで
ある。Table 2 shows the evaluation results regarding image quality, toner blur, and toner consumption after 20,000 copies. Here, the image quality was evaluated by visually observing the transferred image. In addition, the soil strength blurring was evaluated by measuring the fogging density in the non-image area using a photovoltmeter manufactured by Tokyo Juishiki Co., Ltd. The detailed evaluation criteria are as follows.
ｉ）画質 ○；エツジ効果による先端欠けが全く見られなかった。i) Image quality ○: No tip chipping due to edge effect was observed.
Δ；エツジ効果による先端欠けがわずかに見られた。Δ: Slight chipping of the tip due to edge effect was observed.
×；エツジ効果による先端欠けが著しく見られた。×: Significant chipping of the tip due to edge effect was observed.
ｉｉ）地力ブリ Ｏ；非画像部の濃度が０．０１未満であった。ii) Jiyoku Buri O: The density of the non-image area was less than 0.01.
×；非画像部の濃度が０．０１以上であった。x: The density of the non-image area was 0.01 or more.
１ｉｉ））ナー消費量
０；トナー消費量が全面積における黒色部の比率が６％
のＡ４原稿において５０ （ｍｇ／枚）未満であった。1ii)) Toner consumption is 0; toner consumption is 6% of the total area of the black area.
The amount was less than 50 (mg/sheet) in an A4 manuscript.
×；トナー消費量が全面積における黒色部の比率が６％
のＡ４原稿において５０ （ｍｇ／枚）以上であった。×; Toner consumption is 6% of the black area in the total area
It was 50 (mg/sheet) or more in A4 manuscripts.
第２表から明らかなように本発明の反転現像用現像剤は
画質、地力ブリ及びトナー消費量とも良好なことが確認
された。As is clear from Table 2, the developer for reversal development of the present invention was confirmed to be good in image quality, toner blur, and toner consumption.
本発明は、以上のように酸化マグネシウムを特定量含有
したフェライトキャリアと特定の電気抵抗を存するトナ
ーより構成されているため、連続複写においてエツジ効
果による画線部の先後端欠けが発生せず良好な画質を得
ることができること、地力ブリが少ないこと、トナーの
消費量が少ないこと等のすぐれた実用特性を有するもの
である。As described above, the present invention is composed of a ferrite carrier containing a specific amount of magnesium oxide and a toner having a specific electrical resistance, so that chipping at the leading and trailing edges of the image area due to the edge effect does not occur during continuous copying. It has excellent practical properties such as being able to obtain high image quality, having little blurring, and consuming less toner.
そして更に本発明の特筆すべき作用効果としてキャリア
の表面に高価な樹脂被覆を施すことなく多数枚連続複写
に耐えられる反転現像用現像剤を提供することができる
。Furthermore, as a noteworthy effect of the present invention, it is possible to provide a developer for reversal development that can withstand continuous copying of a large number of sheets without applying an expensive resin coating to the surface of the carrier.
特許出願人 株式会社巴川製紙所Patent applicant: Tomoekawa Paper Mills Co., Ltd.
Claims (1)
抗が２×１０＾８〜３×１０＾９Ω・ｃｍのフェライト
キャリアと、電気抵抗が９×１０＾１＾０Ω・ｃｍ以上
であるトナーからなることを特徴とする反転現像用現像
剤。From a ferrite carrier containing 5 to 15 mol% of magnesium oxide and having an electrical resistance of 2 x 10^8 to 3 x 10^9 Ωcm, and a toner having an electrical resistance of 9 x 10^1^0 Ωcm or more. A developer for reversal development, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1088082A JP2518684B2 (en) | 1989-04-10 | 1989-04-10 | Developer for reversal development |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1088082A JP2518684B2 (en) | 1989-04-10 | 1989-04-10 | Developer for reversal development |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02267566A true JPH02267566A (en) | 1990-11-01 |
| JP2518684B2 JP2518684B2 (en) | 1996-07-24 |
Family
ID=13932944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1088082A Expired - Lifetime JP2518684B2 (en) | 1989-04-10 | 1989-04-10 | Developer for reversal development |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2518684B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007293242A (en) * | 2006-03-31 | 2007-11-08 | Tomoegawa Paper Co Ltd | Toner and two-component developer |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123548A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58123552A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58123550A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58144839A (en) * | 1982-02-13 | 1983-08-29 | Tdk Corp | Magnetic carrier particles |
| JPS58145621A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS59121350A (en) * | 1982-12-28 | 1984-07-13 | Toshiba Corp | Developing method |
| JPS59182464A (en) * | 1983-04-01 | 1984-10-17 | Hitachi Ltd | Method for electrophotography |
| JPS59228664A (en) * | 1983-06-10 | 1984-12-22 | Tdk Corp | Ferrite carrier for development in electrophotography |
| JPS6250839A (en) * | 1985-08-30 | 1987-03-05 | Dowa Teppun Kogyo Kk | Production of ferrite carrier for electrophotographic developer |
| JPS6428233A (en) * | 1988-06-17 | 1989-01-30 | Tdk Corp | Production of magnetic carrier |
| JPS6428236A (en) * | 1988-06-17 | 1989-01-30 | Tdk Corp | Production of magnetic carrier |
| JPS6484280A (en) * | 1987-09-28 | 1989-03-29 | Toshiba Corp | Image formation device |
| JPS6484277A (en) * | 1987-09-28 | 1989-03-29 | Toshiba Corp | Image formation device |
-
1989
- 1989-04-10 JP JP1088082A patent/JP2518684B2/en not_active Expired - Lifetime
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58123548A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58123552A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58123550A (en) * | 1982-01-19 | 1983-07-22 | Hitachi Metals Ltd | Electrophotographic developing carrier |
| JPS58145621A (en) * | 1982-02-12 | 1983-08-30 | Tdk Corp | Magnetic carrier particle |
| JPS58144839A (en) * | 1982-02-13 | 1983-08-29 | Tdk Corp | Magnetic carrier particles |
| JPS59121350A (en) * | 1982-12-28 | 1984-07-13 | Toshiba Corp | Developing method |
| JPS59182464A (en) * | 1983-04-01 | 1984-10-17 | Hitachi Ltd | Method for electrophotography |
| JPS59228664A (en) * | 1983-06-10 | 1984-12-22 | Tdk Corp | Ferrite carrier for development in electrophotography |
| JPS6250839A (en) * | 1985-08-30 | 1987-03-05 | Dowa Teppun Kogyo Kk | Production of ferrite carrier for electrophotographic developer |
| JPS6484280A (en) * | 1987-09-28 | 1989-03-29 | Toshiba Corp | Image formation device |
| JPS6484277A (en) * | 1987-09-28 | 1989-03-29 | Toshiba Corp | Image formation device |
| JPS6428233A (en) * | 1988-06-17 | 1989-01-30 | Tdk Corp | Production of magnetic carrier |
| JPS6428236A (en) * | 1988-06-17 | 1989-01-30 | Tdk Corp | Production of magnetic carrier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007293242A (en) * | 2006-03-31 | 2007-11-08 | Tomoegawa Paper Co Ltd | Toner and two-component developer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2518684B2 (en) | 1996-07-24 |
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