JPH0827557B2 - Carrier for electrophotographic developer - Google Patents
Carrier for electrophotographic developerInfo
- Publication number
- JPH0827557B2 JPH0827557B2 JP62028061A JP2806187A JPH0827557B2 JP H0827557 B2 JPH0827557 B2 JP H0827557B2 JP 62028061 A JP62028061 A JP 62028061A JP 2806187 A JP2806187 A JP 2806187A JP H0827557 B2 JPH0827557 B2 JP H0827557B2
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- copolymer
- core material
- 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.)
- Expired - Lifetime
Links
- 229920001577 copolymer Polymers 0.000 claims description 25
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical group C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 23
- 239000011162 core material Substances 0.000 claims description 20
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 13
- 239000006249 magnetic particle Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000002245 particle Substances 0.000 description 15
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 239000000203 mixture Substances 0.000 description 7
- 239000000178 monomer Substances 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 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
- 230000000694 effects Effects 0.000 description 3
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical group C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 2
- 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
- 229920001688 coating polymer Polymers 0.000 description 2
- 239000007822 coupling agent 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
- 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
- ISRGONDNXBCDBM-UHFFFAOYSA-N 2-chlorostyrene Chemical compound ClC1=CC=CC=C1C=C ISRGONDNXBCDBM-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
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- KETWBQOXTBGBBN-UHFFFAOYSA-N hex-1-enylbenzene Chemical compound CCCCC=CC1=CC=CC=C1 KETWBQOXTBGBBN-UHFFFAOYSA-N 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
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- -1 pt- Chemical compound 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
- 229910052725 zinc Inorganic materials 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)
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。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げればならない。(Prior art and its problems) In electrophotography, when developing an electrostatic charge image on a photoreceptor,
A two-component dry developer composed of a mixture of carrier particles and toner particles is used. This two-component dry developer causes toner particles charged by friction with carrier particles to adhere to an electrostatic image. At this time, the toner particles must have an appropriate charge amount so that they are accurately attached only to the position of the electrostatic 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 charge amount suitable for various copying machines and toner particles is different, a carrier having an appropriate charge amount is required for each.
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59-124
345号）がある。As a method for obtaining an appropriate amount of charge, a method of coating the surface of the core material with a resin containing an antistatic agent (Japanese Patent Laid-Open No. 59-124)
345).
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, such a carrier in which the surface of the core material is coated with a resin containing an antistatic agent causes deterioration of the antistatic agent, making it difficult to obtain a stable charge amount, and the antistatic agent escapes due to a bleed phenomenon. There is a drawback that the effect is lost and the copy image quality is deteriorated 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, it is necessary for the carrier to maintain a stable surface state without the surface coating resin peeling 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。In order to prevent the resin coating the surface of the core from falling off,
A method using a coupling agent (JP-A-60-19156) can be mentioned.
しかしながら、この方法はカッ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 the drawbacks that the cost is high because a coupling agent is used, and that it takes time and effort to coat the core material with a 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。Further, for the purpose of carrier particles having good charge amount and fluidity, magnetic carrier particles for electrophotographic development in which the surface of the magnetic particles is coated with a mixture of a styrene polymer and a maleic acid polymer (JP-A-61-51159). ) Is proposed. However, since this method uses a mixture of a styrene-based polymer and a maleic acid-based polymer, it has a drawback that it is difficult to uniformly coat the surface of the magnetic particles with the polymer having the intended composition. Further, since it is a mixed polymer, the adhesion to the core material was not sufficient.
（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 Problems) In the carrier for electrophotographic development of the present invention, a core material surface using magnetic particles is coated with a copolymer composed 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 uniform coating polymer in which the composition ratio of the styrenic monomer and maleic anhydride is clear. Therefore, by changing the composition ratio of the copolymer or changing the coating amount of the copolymer, the charge amount of the carrier particles generated when the carrier particles and the toner particles are brought into frictional contact can be adjusted. .
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, the carrier having a high bondability between the copolymer coating layer and the core material and having good durability was successfully obtained.
以下、本発明を具体的に説明する。 Hereinafter, the present invention will be specifically described.
本発明の電子写真現像用キャリア粒子は、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 electrophotographic development 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、γ−酸化鉄等が挙げら
れる。ソフトフェライトとしては、Ni、Mn、Mg、Zn、C
u、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 having a particle size of 10 to 500 μm, and examples thereof include magnetite, soft ferrite, and γ-iron oxide. As soft ferrite, Ni, Mn, Mg, Zn, C
Those containing at least one of u, Co and the like 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 composed of a styrenic 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−ｔ−、ブチルスチレ
ン、ｏ−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 styrene-based monomer forming the coating copolymer include styrene, α-methylstyrene, α-chlorostyrene, p-methylstyrene, pt-, butylstyrene, o-chlorostyrene and p-chlorostyrene. Can be mentioned. Of these, styrene is particularly preferable.
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％未満である
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％超えであるとス
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 to the surface of the core material will be deteriorated and the copolymer layer will be easily peeled off from the core material. If it is more than 30% by weight, charging due to copolymerization with a styrene-based monomer will occur. It becomes difficult to adjust the amount. A more preferred 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くするほ
どマイナス側に帯電しやすくなる。As a method of adjusting the charge amount, the larger the content of maleic anhydride or its hydrolyzate, the easier it becomes to be positively charged, and the larger the content of styrene-based monomer, the easier it becomes to become negatively charged.
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 is a method of coating the core material surface with the copolymer by immersing the core material in a copolymer solution dissolved in chloroform, toluene, xylene, methyl ethyl ketone, acetone or the like, and removing the solvent, or It can be produced by a method in which the core material is fluidized and then sprayed with the copolymer solution, or a method in which the copolymer and the core material are directly mixed at a melting temperature of the copolymer or higher.
共重合体の被覆量は、芯材100重量％あたり0.1〜５重
量％程度が好ましく、これ以上だとキャリア粒子同士が
ブロッ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 coating amount of the copolymer is preferably about 0.1 to 5% by weight per 100% by weight of the core material, and if it is more than this, carrier particles are likely to cause blocking, which reduces fluidity,
If it is less than this, the effect of coating is 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℃未満の融点では、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 a molecular weight having a melting point of at least 80 ° C. or higher is desirable. If the melting point is lower than 80 ° C., the inside of the copying machine tends to have a relatively high temperature, and the heat resistance of the carrier particles becomes a problem.
（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、積水化成品工業（株）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 1 part of Dailark (a copolymer consisting of 85% styrene and 15% maleic anhydride, manufactured by Sekisui Plastics Co., Ltd.) was dissolved in 100 parts of chloroform to prepare a copolymer solution. .
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時間撹拌した後、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。Immerse 50 parts of Ni-based soft ferrite in the above solution, 80
After stirring at 1 ° 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-112
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 used as DC-112 manufactured by Mita Kogyo.
The toner was mixed with about 5% of the toner for use and the charge amount was measured by the blow-off method. The surface of the carrier after the blow-off was observed with a scanning electron microscope, and it was confirmed that the carrier was very excellent in durability and was not much different from that before the toner was mixed.
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 treatment as in Example 1 was carried out except that the Dailark used in Example 1 was changed to 2 parts. As a result, the charge amount is 7.6
It became μc / g. The surface of the carrier after the blow-off was observed with a scanning electron microscope, and it was confirmed that the carrier was very excellent in durability and was not much different from that before the toner was mixed.
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（株）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 1 part of Dick styrene (polystyrene, manufactured by Dainippon Ink and Chemicals, Inc.) was dissolved in 100 parts of chloroform and treated in the same manner as in Example 1. As a result, the charge amount is 8.0
It became μc / g. It was found that the surface condition after the blow-off was poor in durability due to peeling and the like.
各例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 results of the live-action test of the carriers obtained in each example are summarized in the following table.
（発明の効果） 本発明により得られたキャリアは、スチレン型モノマ
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、手間がかか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。 (Effect of the invention) Since the carrier obtained by the present invention is coated with a copolymer composed of a styrene-type monomer and maleic anhydride or a hydrolyzate thereof, it becomes easy to coat the surface of the core material, which is troublesome. It is possible to obtain good image quality.
Further, the charge amount can be adjusted by changing the composition ratio of the monomers or the coating amount of the copolymer, and a stable charge amount can be obtained. In addition, the action of maleic anhydride in the copolymer can enhance the adhesion to the core material, and an excellent carrier for electrophotographic developer can be obtained.
Claims (2)
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電子写真現像剤用キャリア。1. A carrier for an electrophotographic developer in which a core material surface using magnetic particles is coated with a copolymer composed of a styrene monomer and maleic anhydride or a hydrolyzate thereof.
はその加水分解物からなる共重合体の融点が80℃以上で
あり、かつ共重合体中のスチレン系モノマーの割合が70
〜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 melting point of a copolymer comprising a styrene monomer and maleic anhydride or a hydrolyzate thereof is 80 ° C. or higher, and the ratio of the 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 JPS63197963A (en) | 1988-08-16 |
| JPH0827557B2 true 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) |
Family Cites Families (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63197963A (en) | 1988-08-16 |
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