JPS63197963A - Carrier for electrophotographic developer - Google Patents
Carrier for electrophotographic developerInfo
- Publication number
- JPS63197963A JPS63197963A JP62028061A JP2806187A JPS63197963A JP S63197963 A JPS63197963 A JP S63197963A JP 62028061 A JP62028061 A JP 62028061A JP 2806187 A JP2806187 A JP 2806187A JP S63197963 A JPS63197963 A JP S63197963A
- Authority
- JP
- Japan
- Prior art keywords
- copolymer
- core material
- carrier
- maleic anhydride
- coating
- 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
- 229920001577 copolymer Polymers 0.000 claims abstract description 30
- 239000011162 core material Substances 0.000 claims abstract description 24
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 22
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000006249 magnetic particle Substances 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 abstract description 13
- 238000000576 coating method Methods 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 10
- 229920000642 polymer Polymers 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000178 monomer Substances 0.000 abstract description 4
- 239000002245 particle Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000002216 antistatic agent Substances 0.000 description 4
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 3
- 229910001035 Soft ferrite Inorganic materials 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- -1 -Chlorstyrene Chemical compound 0.000 description 1
- QOVCUELHTLHMEN-UHFFFAOYSA-N 1-butyl-4-ethenylbenzene Chemical compound CCCCC1=CC=C(C=C)C=C1 QOVCUELHTLHMEN-UHFFFAOYSA-N 0.000 description 1
- KTZVZZJJVJQZHV-UHFFFAOYSA-N 1-chloro-4-ethenylbenzene Chemical compound ClC1=CC=C(C=C)C=C1 KTZVZZJJVJQZHV-UHFFFAOYSA-N 0.000 description 1
- XHAFIUUYXQFJEW-UHFFFAOYSA-N 1-chloroethenylbenzene Chemical compound ClC(=C)C1=CC=CC=C1 XHAFIUUYXQFJEW-UHFFFAOYSA-N 0.000 description 1
- JLBJTVDPSNHSKJ-UHFFFAOYSA-N 4-Methylstyrene Chemical compound CC1=CC=C(C=C)C=C1 JLBJTVDPSNHSKJ-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001688 coating polymer Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008096 xylene 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
- G03G9/10—Developers with toner particles characterised by carrier particles
- G03G9/113—Developers with toner particles characterised by carrier particles having coatings applied thereto
- G03G9/1132—Macromolecular components of coatings
- G03G9/1133—Macromolecular components of coatings obtained by reactions only involving carbon-to-carbon unsaturated bonds
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Spectroscopy & Molecular Physics (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、電子写真法において、静電潜像を現像するた
めの二成分現像剤に使われるキャリアに関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a carrier used in a two-component developer for developing an electrostatic latent image in electrophotography.
（従来の技術とその問題点）
電子写真法では、感光体上の静電荷像を現像する際、キ
ャリア粒子とトナー粒子との混合物から成る二成分系乾
式現像剤が用いられている。この二成分系乾式現像剤は
、キャリア粒子との摩擦により帯電したトナー粒子を静
電荷像に付着せしめるものである。この際にトナー粒子
は、静電荷像の位置のみに正確に付着するような適当な
帯電量を有していなければならない。(Prior Art and its Problems) In electrophotography, a two-component dry developer consisting of a mixture of carrier particles and toner particles is used to develop an electrostatically charged image on a photoreceptor. This two-component dry developer causes charged toner particles to adhere to an electrostatic image by friction with carrier particles. At this time, the toner particles must have an appropriate amount of charge so that they are accurately attached only to the position of the electrostatic charge image.
しかし、各種の複写機やトナー粒子に適した帯電量は異
なるため、それぞれに適切な帯電量を有するキャリアが
要求される。However, since the amount of charge suitable for each type of copying machine and toner particle differs, a carrier having an appropriate amount of charge is required for each type of copying machine.
適切な帯電量を得るための方法として、芯材表面に帯電
防止剤を含有した樹脂を被覆する方法（特開昭５９−１
２４３４５号）がある。As a method for obtaining an appropriate amount of charge, the surface of the core material is coated with a resin containing an antistatic agent (Japanese Unexamined Patent Publication No. 59-1
No. 24345).
しかしながら、このような芯材表面に帯電防止剤を含有
した樹脂を被覆したキャリアは、帯電防止剤の劣化が原
因となり、安定な帯電量が得られにくく、さらに帯電防
止剤がブリード現象により逃散し効果が失われ、それに
ともなってコピー画質が劣化する欠点がある。However, with such carriers whose core material surface is coated with resin containing an antistatic agent, it is difficult to obtain a stable charge amount due to deterioration of the antistatic agent, and furthermore, the antistatic agent escapes due to a bleed phenomenon. The disadvantage is that the effect is lost and the copy image quality deteriorates accordingly.
さらに、キャリアは長期間の使用により、表面被覆樹脂
が剥離脱落することなく安定した表面状態を保持する必
要がある。Further, the carrier needs to maintain a stable surface condition without the surface coating resin peeling off or falling off during long-term use.
芯材表面を被覆した樹脂の剥離脱落を防止するため、カ
ップリング剤を使用する方法（特開昭６０−１９１５６
号）が挙げられる。A method of using a coupling agent to prevent the resin coating the surface of the core material from peeling off and falling off (Japanese Patent Laid-Open No. 60-19156
).
しかしながら、この方法はカンプリング剤を使用するた
めコスト高になるとともに、芯材を樹脂被覆する際に手
間がかかる等の欠点を有する。However, this method has drawbacks such as high cost due to the use of a compulsory agent, and the time and effort required to coat the core material with resin.
また、帯電量および流動性の良好なキャリア粒子を目的
として、スチレン系ポリマーとマレイン酸系ポリマーと
の混合物を磁性粒子の表面に被覆した電子写真現像用磁
性キャリア粒子（特開昭６１−５１１５９号）が提案さ
れている。しかしながら、この方法ではスチレン系ポリ
マーとマレイン酸系ポリマーの混合物を用いるため、目
的とする組成のポリマーを均一に磁性粒子の表面に被覆
することが難しい欠点があった。また、混合ポリマーの
ため芯材との密着性が充分でなかった。In addition, in order to obtain carrier particles with good chargeability and fluidity, magnetic carrier particles for electrophotographic development in which the surfaces of magnetic particles are coated with a mixture of a styrene polymer and a maleic acid polymer (Japanese Patent Application Laid-Open No. 61-51159 ) has been proposed. However, since this method uses a mixture of a styrene polymer and a maleic acid polymer, it has the disadvantage that it is difficult to uniformly coat the surface of the magnetic particles with a polymer having the desired composition. In addition, because of the mixed polymer, adhesion to the core material was insufficient.
（問題点を解決するための手段）
本発明の電子写真現像用キャリアは、磁性粒子を用いた
芯材表面にスチレン系モノマーと無水マレイン酸、また
はその加水分解物から成る共重合体を被覆することを特
徴とする。(Means for Solving the Problems) The carrier for electrophotographic development of the present invention coats the surface of a core material using magnetic particles with a copolymer consisting of a styrene monomer and maleic anhydride, or a hydrolyzate thereof. It is characterized by
本発明の電子写真現像用キャリアはスチレン系モノマー
と無水マレイン酸またはその加水分解物の共重合体を被
覆ポリマーとして用いるものである。このポリマーはス
チレン系モノマーおよび無水マレイン酸の組成割合が明
らかな、均一な被覆ポリマーである。従って、その共重
合体の組成比を変えること、または共重合体の被覆量を
変えることにより、キャリア粒子とトナー粒子を摩擦接
触させた際に発生するキャリア粒子の帯電量を調節する
ことが出来る。The carrier for electrophotographic development of the present invention uses a copolymer of a styrene monomer and maleic anhydride or a hydrolyzate thereof as a coating polymer. This polymer is a uniformly coated polymer with clear composition ratios of styrenic monomer and maleic anhydride. Therefore, by changing the composition ratio of the copolymer or changing the amount of copolymer coating, it is possible to adjust the amount of charge on the carrier particles that is generated when the carrier particles and toner particles are brought into frictional contact. .
また、本発明によれば、無水マレイン酸と芯材表面との
強い相互作用により、共重合体被覆層と芯材の結合性が
高く、耐久性の良好なキャリアを得ることに成功した。Further, according to the present invention, due to the strong interaction between maleic anhydride and the surface of the core material, it was possible to obtain a carrier with high bonding properties between the copolymer coating layer and the core material and good durability.
以下、本発明を具体的に説明する。The present invention will be specifically explained below.
本発明の電子写真現像剤用キャリア粒子は、磁性粒子の
表面に共重合体被覆層を形成して成る。The carrier particles for an electrophotographic developer of the present invention are formed by forming a copolymer coating layer on the surface of magnetic particles.
本発明において、芯材として用いる磁性粒子は、粒子径
が１０〜５００ミクロンの鉄系粉体が好ましく、例えば
マグネタイト、ソフトフェライト、Ｔ−酸化鉄等が挙げ
られる。ソフトフェライトとしては、Ｎｉ５Ｍｎ５Ｍｇ
５ Ｚｎｓ Ｃ１１％ ＣＯ等のうちの１種以上を含有
するものを使用することができる。このような磁性粒子
は１０〜４０μｃ／ｇの帯電量を有する。In the present invention, the magnetic particles used as the core material are preferably iron-based powders with a particle size of 10 to 500 microns, such as magnetite, soft ferrite, T-iron oxide, and the like. As soft ferrite, Ni5Mn5Mg
5 Zns C11% CO, etc. can be used. Such magnetic particles have a charge amount of 10 to 40 μc/g.
被覆は、スチレン系モノマーと無水マレイン酸またはそ
の加水分解物から成る共重合体によって行う。The coating is performed with a copolymer consisting of a styrene monomer and maleic anhydride or a hydrolyzate thereof.
被覆する共重合体を形成するスチレン系モノマーとして
は、スチレン、α−メチルスチレン、α−クロルスチレ
ン、ｐ−メチルスチレン、ｐ−を−ブチルスチレン、０
−クロルスチレン、ｐ−クロルスチレン等が挙げられる
。このなかで、特に好ましいものは、スチレンである。Examples of the styrenic monomer forming the coating copolymer include styrene, α-methylstyrene, α-chlorostyrene, p-methylstyrene, p-butylstyrene,
-Chlorstyrene, p-chlorostyrene, and the like. Among these, styrene is particularly preferred.
共重合体中の無水マレイン酸またはその加水分解物の含
有量は１〜３０重量％が好ましい。１重量％以下である
と、芯材表面との密着性が悪くなり、共重合体層が芯材
から剥離脱落し易くなり、また３０重量％以上であると
スチレン系モノマーとの共重合による帯電量の調整が困
難になる。より好ましい範囲は５〜２０重量％である。The content of maleic anhydride or its hydrolyzate in the copolymer is preferably 1 to 30% by weight. If it is less than 1% by weight, the adhesion with the surface of the core material will be poor and the copolymer layer will easily peel off from the core material, and if it is more than 30% by weight, it will be charged due to copolymerization with the styrene monomer. It becomes difficult to adjust the amount. A more preferable range is 5 to 20% by weight.
帯電量の調整方法としては、無水マレイン酸またはその
加水分解物の含有量を多くするほどプラス側に帯電しや
すくなり、スチレン系モノマーの含有量を多（するほど
マイナス側に帯電しやすくなる。As a method for adjusting the amount of charge, the higher the content of maleic anhydride or its hydrolyzate, the easier it is to be charged to the positive side, and the higher the content of the styrene monomer, the easier it is to be charged to the negative side.
本発明のキャリアは、クロロホルム、トルエン、キシレ
ン、メチルエチルケトン、アセトン等に溶解させた共重
合体溶液に芯材を浸漬し、溶剤を除去することにより芯
材表面に共重合体を被覆させる方法、あるいは芯材を流
動化せしめておき、これに前記共重合体溶液をスプレー
する方法、共重合体の溶融温度以上で直接共重合体と芯
材を混合する方法等により製造することが出来る。The carrier of the present invention can be prepared by coating the surface of the core material with the copolymer by immersing the core material in a copolymer solution dissolved in chloroform, toluene, xylene, methyl ethyl ketone, acetone, etc. and removing the solvent; It can be produced by a method of fluidizing the core material and spraying the copolymer solution thereon, or by directly mixing the copolymer and the core material at a temperature higher than the melting temperature of the copolymer.
共重合体の被覆量は、芯材１００重景重量たり０．１〜
５重量重量道程好ましく、これ以上だとキャリア粒子同
士がプロンキングを起こしやすくなり、流動性を低下さ
せ、これ以下だと被覆の効果が少なくなる。より好まし
い被覆量は芯材に対し０．５〜３重量％である。The amount of copolymer coating is 0.1 to 100 weight of core material.
5 weight range is preferable; if it is more than this, carrier particles tend to pronk with each other, reducing fluidity, and if it is less than this, the coating effect will be reduced. A more preferable coating amount is 0.5 to 3% by weight based on the core material.
用いる共重合体の分子量は特に限定されるものではない
が、少なくとも８０℃以上の融点を有する分子量のもの
が望ましい。８０℃以下の融点では、複写機内部が比較
的高温となり易い為、キャリア粒子の耐熱性が問題とな
るからである。The molecular weight of the copolymer used is not particularly limited, but it is desirable that the copolymer has a melting point of at least 80°C or higher. This is because at a melting point of 80° C. or lower, the inside of the copying machine tends to reach a relatively high temperature, which poses a problem in the heat resistance of the carrier particles.
（実施例）
実施例１
ダイラーク （スチレン８５％、無水マレイン酸１５％
から成る共重合体、槽水化成品工業■製）１部をクロロ
ホルム１００部に溶解し、共重合体溶液を調製した。(Example) Example 1 Dilarc (85% styrene, 15% maleic anhydride)
A copolymer solution was prepared by dissolving 1 part of a copolymer (manufactured by Tansui Kaseihin Kogyo ■) in 100 parts of chloroform.
上記溶液中にＮｉ系ソフトフェライト５０部を浸漬し、
８０℃で１時間攪拌した後、溶媒を除去することにより
、電子写真現像用キャリアを得た。50 parts of Ni-based soft ferrite is immersed in the above solution,
After stirring at 80° C. for 1 hour, the solvent was removed to obtain a carrier for electrophotographic development.
かくして得られたキャリア材料を、三田工業製ＤＣ−１
１２用トナー約５％と混合し、ブローオフ法により帯電
量を測定したところ、１１．４μｃ／ｇであった。また
、ブローオフ後のキャリア表面を走査型電子顕微鏡によ
って観察したが、トナー混合前と大差なく、極めて耐久
性に優れたキャリアであることが確認出来た。The carrier material thus obtained was transferred to DC-1 manufactured by Sanda Kogyo Co., Ltd.
When the mixture was mixed with about 5% of toner for No. 12 and the amount of charge was measured by a blow-off method, it was found to be 11.4 μc/g. Furthermore, when the surface of the carrier after blow-off was observed using a scanning electron microscope, it was confirmed that there was no significant difference from before the toner was mixed, and that the carrier had extremely excellent durability.
実施例２
実施例１で用いたダイラークを２部に変えた以外は実施
例１と同じように処理した。その結果、帯電量は７．６
μｃ／ｇになった。また、ブローオフ後のキャリア表面
を走査型電子顕微鏡によって観察したが、トナー混合前
と大差なく、極めて耐久性に優れたキャリアであること
が確認出来た。Example 2 The same process as in Example 1 was carried out except that 2 parts of Dilarc were used in Example 1. As a result, the amount of charge was 7.6
It became μc/g. Furthermore, when the surface of the carrier after blow-off was observed using a scanning electron microscope, it was confirmed that there was no significant difference from before the toner was mixed, and that the carrier had extremely excellent durability.
比較例１
ディックスチレン（ポリスチレン、大日本インキ化学工
業■製） １部をクロロホルム１００部に溶解し、実施
例１と同じように処理した。その結果、帯電量は８．０
μｃ／ｇになった。ブローオフ後の表面状態は、剥離等
が起こっており、耐久性に乏しいことがわかった。Comparative Example 1 One part of Dix Styrene (polystyrene, manufactured by Dainippon Ink & Chemicals) was dissolved in 100 parts of chloroform and treated in the same manner as in Example 1. As a result, the amount of charge was 8.0
It became μc/g. It was found that the surface condition after blow-off showed peeling, etc. and poor durability.
各側で得られたキャリアの実写テスト結果をまとめて次
の表に示す。The following table summarizes the carrier live-action test results obtained for each side.
実写テスト ＤＣ−１１２（三田工業製）（発明の効果
）
本発明により得られたキャリアは、スチレン系モノマー
と無水マレイン酸またはその加水分解物から成る共重合
体を被覆したので、芯材表面に被覆することが容易とな
り、手間がかがらず良好な画質を得ることができる。ま
た、モノマーの組成比または共重合体の被覆量を変化さ
せることにより、帯電量を調節することが出来、安定し
た帯電量が得られる。また、共重合体中の無水マレイン
酸の作用により、芯材との密着性を高めることができ、
優れた耐久性の電子写真現像剤用キャリアが得られる。Actual photo test DC-112 (manufactured by Sanda Kogyo) (effects of the invention) The carrier obtained by the present invention was coated with a copolymer consisting of a styrene monomer and maleic anhydride or its hydrolyzate, so that the surface of the core material It becomes easy to cover, and good image quality can be obtained without much effort. Further, by changing the composition ratio of the monomers or the amount of coating of the copolymer, the amount of charge can be adjusted, and a stable amount of charge can be obtained. In addition, due to the action of maleic anhydride in the copolymer, the adhesion with the core material can be increased.
A carrier for electrophotographic developer with excellent durability can be obtained.
Claims (2)
と無水マレイン酸またはその加水分解物から成る共重合
体を被覆する電子写真現像剤用キャリア。(1) A carrier for an electrophotographic developer, in which the surface of a core material using magnetic particles is coated with a copolymer consisting of a styrene monomer and maleic anhydride or a hydrolyzate thereof.
９９重量％、無水マレイン酸またはその加水分解物の割
合が１〜３０重量％である特許請求の範囲第１項記載の
電子写真現像剤用キャリア。(2) The proportion of styrene monomer in the copolymer is 70~
The carrier for an electrophotographic developer according to claim 1, wherein the proportion of maleic anhydride or its hydrolyzate is 1 to 30% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62028061A JPH0827557B2 (en) | 1987-02-12 | 1987-02-12 | Carrier for electrophotographic developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62028061A JPH0827557B2 (en) | 1987-02-12 | 1987-02-12 | Carrier for electrophotographic developer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63197963A true JPS63197963A (en) | 1988-08-16 |
| JPH0827557B2 JPH0827557B2 (en) | 1996-03-21 |
Family
ID=12238244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62028061A Expired - Lifetime JPH0827557B2 (en) | 1987-02-12 | 1987-02-12 | Carrier for electrophotographic developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0827557B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61270769A (en) * | 1985-05-25 | 1986-12-01 | Tdk Corp | Magnetic carrier particles for electrophotographic development |
-
1987
- 1987-02-12 JP JP62028061A patent/JPH0827557B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61270769A (en) * | 1985-05-25 | 1986-12-01 | Tdk Corp | Magnetic carrier particles for electrophotographic development |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0827557B2 (en) | 1996-03-21 |
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