JPS5764249A - Charge type magnetic toner - Google Patents

Charge type magnetic toner

Info

Publication number
JPS5764249A
JPS5764249A JP55140078A JP14007880A JPS5764249A JP S5764249 A JPS5764249 A JP S5764249A JP 55140078 A JP55140078 A JP 55140078A JP 14007880 A JP14007880 A JP 14007880A JP S5764249 A JPS5764249 A JP S5764249A
Authority
JP
Japan
Prior art keywords
control agent
charge control
magnetic
toner
surface layer
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
JP55140078A
Other languages
Japanese (ja)
Inventor
Koji Noguchi
Masumi Asanae
Takaharu Goto
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP55140078A priority Critical patent/JPS5764249A/en
Publication of JPS5764249A publication Critical patent/JPS5764249A/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
    • G03G9/0825—Developers with toner particles characterised by their structure; characterised by non-homogenuous distribution of components

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE:To obtain friction hcarge effectively, and to obtain an excellent picture, by fixing a charge control agent whose volume resistance and charged quantity are a specific value or above, to the surface layer of a magnetic toner consisting of magnetic powder and binder resin, etc. CONSTITUTION:A charge control agent whose volume resistance and absolute value of charges quantity are 1X10<10>OMEGA-cm or above, and 10muC/g or above, respectively is fixed to a part or the whole of the surface layer of a magnetic toner consisting of magnetic powder and binder resin. For instance, 50pts.wt. epoxy resin, carbon black and 45pts.wt. magnetic are heated and mixed, and after that, are pulverized, by which particles of <=30mu are obtained. Subsequently, a negative charge type charge control agent (containing metallic dyestuff) which has been pulverized to particles of <=10mu in advance is added by 3wt% to the toner particles, is mixed enough, and afte that, is made to pass through in a spraying state in a hot air current of 180 deg.C, and the charge control agent is made to tightly adhere onto the surface layer of a toner. Subsequently, when its particle size is made 5-20mu by a wind-force classifier, it is possible to obtain a charge type magnetic toner for an electrophotography system copying machine, which has an Se photosensitive body.
JP55140078A 1980-10-07 1980-10-07 Charge type magnetic toner Pending JPS5764249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55140078A JPS5764249A (en) 1980-10-07 1980-10-07 Charge type magnetic toner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55140078A JPS5764249A (en) 1980-10-07 1980-10-07 Charge type magnetic toner

Publications (1)

Publication Number Publication Date
JPS5764249A true JPS5764249A (en) 1982-04-19

Family

ID=15260443

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55140078A Pending JPS5764249A (en) 1980-10-07 1980-10-07 Charge type magnetic toner

Country Status (1)

Country Link
JP (1) JPS5764249A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5149611A (en) * 1987-02-17 1992-09-22 Minolta Camera Kabushiki Kaisha Color toner for developing electrostatic latent image

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5149611A (en) * 1987-02-17 1992-09-22 Minolta Camera Kabushiki Kaisha Color toner for developing electrostatic latent image

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