JPS57120941A - Positively chargeable toner for use in 2-component dry type developer - Google Patents

Positively chargeable toner for use in 2-component dry type developer

Info

Publication number
JPS57120941A
JPS57120941A JP56006295A JP629581A JPS57120941A JP S57120941 A JPS57120941 A JP S57120941A JP 56006295 A JP56006295 A JP 56006295A JP 629581 A JP629581 A JP 629581A JP S57120941 A JPS57120941 A JP S57120941A
Authority
JP
Japan
Prior art keywords
toner
mixed
chargeable toner
positive polarity
developer
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
JP56006295A
Other languages
Japanese (ja)
Inventor
Michio Izumi
Masashi Ito
Fusao Shoji
Masaki Takatsugi
Noriaki Ide
Naomi Nozaki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP56006295A priority Critical patent/JPS57120941A/en
Publication of JPS57120941A publication Critical patent/JPS57120941A/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
    • G03G9/097—Plasticisers; Charge controlling agents
    • G03G9/09708—Inorganic compounds

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE:To unite toner polarity uniformly to positive polarity, and to enhance copy quality, by adding alumina powder to a toner containing a resin as a main component, a positive polarity controller, and carbon black. CONSTITUTION:A positive polarity controller, such as nigrosine, 2-10pts.wt., carbon black, 3-10pts.wt., and alumina powder of <=20mum particle diameter, 1- 5pts.wt. are mixed with a main component resin, such as polystyrene, 100pts.wt., melted, mixed, and pulverized to make a positively chargeable toner, which is mixed with a carrier to give a 2-component dry taype developer, thus permitting this developer to have no negatively chargeable toner, ground fog not to increase even when the bias voltage to be applied to a magnetic sleeve is raised against the photoreceptor in developing, and staining in the copying machine to be alleviated.
JP56006295A 1981-01-21 1981-01-21 Positively chargeable toner for use in 2-component dry type developer Pending JPS57120941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56006295A JPS57120941A (en) 1981-01-21 1981-01-21 Positively chargeable toner for use in 2-component dry type developer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56006295A JPS57120941A (en) 1981-01-21 1981-01-21 Positively chargeable toner for use in 2-component dry type developer

Publications (1)

Publication Number Publication Date
JPS57120941A true JPS57120941A (en) 1982-07-28

Family

ID=11634377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56006295A Pending JPS57120941A (en) 1981-01-21 1981-01-21 Positively chargeable toner for use in 2-component dry type developer

Country Status (1)

Country Link
JP (1) JPS57120941A (en)

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