JPS55129356A - Magnetic toner for electrophotography - Google Patents

Magnetic toner for electrophotography

Info

Publication number
JPS55129356A
JPS55129356A JP3652379A JP3652379A JPS55129356A JP S55129356 A JPS55129356 A JP S55129356A JP 3652379 A JP3652379 A JP 3652379A JP 3652379 A JP3652379 A JP 3652379A JP S55129356 A JPS55129356 A JP S55129356A
Authority
JP
Japan
Prior art keywords
toner
fine particles
electric resistance
inorganic
carbon black
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
JP3652379A
Other languages
Japanese (ja)
Inventor
Tsuneaki Kawanishi
Akio Kobi
Yasusada Morishita
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 JP3652379A priority Critical patent/JPS55129356A/en
Publication of JPS55129356A publication Critical patent/JPS55129356A/en
Pending legal-status Critical Current

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  • Developing Agents For Electrophotography (AREA)

Abstract

PURPOSE: To improve a transferred image quality, by keeping the contents of magnetic fine particles and an inorganic or organic powder for controlling an electric resistance and fluidity in a toner in specified ranges to keep the electric resistance and relative dielectric constant of the toner in specified ranges.
CONSTITUTION: 30W70wt% ferromagnetic fine particles, such as magnetite of the total amount of a toner are mixed with polyester binder or the like, colorants, etc. and undergo successively heat kneading, cooling, pulverizing, granulating treatment into spheres in a granulating furnace with 150W170°C hot air, subsequent classification for removing 3μ or less and 30μ or more, and addition of an inorganic or organic powder of 0.01W500μ mean particle diameter in an amount of 0.04W 4wt%, and the toner thus prepared is used. Fine particles of aerosil or the like, silica, carbon black, polystyrene, or the like are used, but a toner having electric characteristics having of 109W5×1015ohm.cm electric resistance and 2W4 specific inductive capacity using especially 0.1W0.4% carbon black gives a transferred image of good density.
COPYRIGHT: (C)1980,JPO&Japio
JP3652379A 1979-03-28 1979-03-28 Magnetic toner for electrophotography Pending JPS55129356A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3652379A JPS55129356A (en) 1979-03-28 1979-03-28 Magnetic toner for electrophotography

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3652379A JPS55129356A (en) 1979-03-28 1979-03-28 Magnetic toner for electrophotography

Publications (1)

Publication Number Publication Date
JPS55129356A true JPS55129356A (en) 1980-10-07

Family

ID=12472160

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3652379A Pending JPS55129356A (en) 1979-03-28 1979-03-28 Magnetic toner for electrophotography

Country Status (1)

Country Link
JP (1) JPS55129356A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797545A (en) * 1980-12-10 1982-06-17 Hitachi Metals Ltd Magnetic toner for electrophotography

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5797545A (en) * 1980-12-10 1982-06-17 Hitachi Metals Ltd Magnetic toner for electrophotography
DE3148989A1 (en) * 1980-12-10 1982-07-08 Hitachi Metals, Ltd., Tokyo METHOD FOR ELECTROPHOTOGRAPHIC REPUBLICATION
JPS6355064B2 (en) * 1980-12-10 1988-11-01 Hitachi Metals Ltd

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