JPS57204560A - Electrophotographic developer - Google Patents

Electrophotographic developer

Info

Publication number
JPS57204560A
JPS57204560A JP56089443A JP8944381A JPS57204560A JP S57204560 A JPS57204560 A JP S57204560A JP 56089443 A JP56089443 A JP 56089443A JP 8944381 A JP8944381 A JP 8944381A JP S57204560 A JPS57204560 A JP S57204560A
Authority
JP
Japan
Prior art keywords
carrier
line
resistance value
increases
mixed
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
Application number
JP56089443A
Other languages
Japanese (ja)
Inventor
Kazuo Terao
Yasushi Ohashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP56089443A priority Critical patent/JPS57204560A/en
Publication of JPS57204560A publication Critical patent/JPS57204560A/en
Pending legal-status Critical Current

Links

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
    • 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
    • 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
    • G03G9/1134—Macromolecular components of coatings obtained by reactions only involving carbon-to-carbon unsaturated bonds containing fluorine atoms

Abstract

PURPOSE:To prevent a secular change in the resistance value of a carrier by mixing and using two kinds of carriers. CONSTITUTION:A carrier of iron oxide powder having a 60mum diameter and a 10<8>OMEGAcm resistance value and a carrier having a 100mum diameter and coated with insulating synthetic resin of a methyl terpolymer, ''Teflon '', etc., by 70% of the surface are mixed in 1:1.5 proportion, and this mixture is further mixed with toner to obtain a developer. When only the iron oxide powder carrier is used, the resistance value increases with time and copy density decreases as shown by a line 1 in the figure; when only the resin-coated carrier is used, the resistance increases and the copy density also increases (line 2). When the both are used by being mixed, constant density is maintained up to 100,000 copies (line 3).
JP56089443A 1981-06-12 1981-06-12 Electrophotographic developer Pending JPS57204560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56089443A JPS57204560A (en) 1981-06-12 1981-06-12 Electrophotographic developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56089443A JPS57204560A (en) 1981-06-12 1981-06-12 Electrophotographic developer

Publications (1)

Publication Number Publication Date
JPS57204560A true JPS57204560A (en) 1982-12-15

Family

ID=13970817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56089443A Pending JPS57204560A (en) 1981-06-12 1981-06-12 Electrophotographic developer

Country Status (1)

Country Link
JP (1) JPS57204560A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578337A (en) * 1983-04-15 1986-03-25 Minolta Camera Kabushiki Kaisha Dry process for developing electrostatic latent images with a developer comprising two kinds of magnetic carriers having different physical structure
EP0361939A2 (en) * 1988-09-30 1990-04-04 Mita Industrial Co., Ltd. A carrier for a developer
EP0430038A2 (en) * 1989-11-22 1991-06-05 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Electrophotographic development process
US5395717A (en) * 1992-05-18 1995-03-07 Kyocera Corporation Developer for developing latent electrostatic images and method of forming images by using the developer
US5554477A (en) * 1992-06-15 1996-09-10 Kyocera Corporation Developer for developing latent electrostatic images
US6365310B1 (en) * 1985-01-19 2002-04-02 Sanyo Electric Co., Ltd. Developing method and a developer for electrophotography

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4578337A (en) * 1983-04-15 1986-03-25 Minolta Camera Kabushiki Kaisha Dry process for developing electrostatic latent images with a developer comprising two kinds of magnetic carriers having different physical structure
US6365310B1 (en) * 1985-01-19 2002-04-02 Sanyo Electric Co., Ltd. Developing method and a developer for electrophotography
EP0361939A2 (en) * 1988-09-30 1990-04-04 Mita Industrial Co., Ltd. A carrier for a developer
EP0430038A2 (en) * 1989-11-22 1991-06-05 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Electrophotographic development process
US5395717A (en) * 1992-05-18 1995-03-07 Kyocera Corporation Developer for developing latent electrostatic images and method of forming images by using the developer
US5554477A (en) * 1992-06-15 1996-09-10 Kyocera Corporation Developer for developing latent electrostatic images
US5633107A (en) * 1992-06-15 1997-05-27 Kyocera Corporation Developer for developing latent electrostatic images and method of forming images by using the developer

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