JPS55129356A - Magnetic toner for electrophotography - Google Patents
Magnetic toner for electrophotographyInfo
- 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
Links
Landscapes
- 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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5797545A (en) * | 1980-12-10 | 1982-06-17 | Hitachi Metals Ltd | Magnetic toner for electrophotography |
-
1979
- 1979-03-28 JP JP3652379A patent/JPS55129356A/en active Pending
Cited By (3)
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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