JPS5478137A - Carrier material for electrostatic developer - Google Patents
Carrier material for electrostatic developerInfo
- Publication number
- JPS5478137A JPS5478137A JP14511077A JP14511077A JPS5478137A JP S5478137 A JPS5478137 A JP S5478137A JP 14511077 A JP14511077 A JP 14511077A JP 14511077 A JP14511077 A JP 14511077A JP S5478137 A JPS5478137 A JP S5478137A
- Authority
- JP
- Japan
- Prior art keywords
- particles
- pores
- electrical insulation
- base polymer
- type resin
- 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 reduce the toner accumulation on electrostatic latent image holding surfaces and carrier surfaces by filling fine powder of an electrical insulation type resin on the pores and dent portions of magnetic particles which are porous or have large surface roughness.
CONSTITUTION: Particles of a ferromagnetic material of particle sizes 50 to 600μ and bulk densities 2 to 4 are mixed in a solution or dispersion of fine particles of an electrical insulation type resin, preferably fluorine base polymer, whereby the fluorine base polymer is impregnated at 0.05 to 20.0 wt.% in the pores of the surfaces thereof and the dent portions of the surfaces and is preferably baked. As a result, the powder characteristics and triboelectrification characteristics under varying humidity conditions are stabilized and the image density is constant and image quality does not degrade despite repeated use, thus the improvement in effective lifetime may be achieved and the lightweight and easy-to-handle developer for magnetic brush may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14511077A JPS5478137A (en) | 1977-12-05 | 1977-12-05 | Carrier material for electrostatic developer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14511077A JPS5478137A (en) | 1977-12-05 | 1977-12-05 | Carrier material for electrostatic developer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5478137A true JPS5478137A (en) | 1979-06-22 |
Family
ID=15377604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14511077A Pending JPS5478137A (en) | 1977-12-05 | 1977-12-05 | Carrier material for electrostatic developer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5478137A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5782853A (en) * | 1980-11-11 | 1982-05-24 | Canon Inc | Developing method |
| JPS5786837A (en) * | 1980-11-19 | 1982-05-31 | Canon Inc | Preparation of electrophotographic developing carrier |
| JPS58108550A (en) * | 1981-12-23 | 1983-06-28 | Fujitsu Ltd | Carrier for magnetic brush development |
| JPH03255462A (en) * | 1990-03-06 | 1991-11-14 | Tomoegawa Paper Co Ltd | Two-component developer for electrophotography and production thereof |
| EP1729180A1 (en) | 2005-05-31 | 2006-12-06 | Powdertech Co., Ltd. | Ferrite core material for resin-filled type carrier, resin-filled type carrier, and electrophotographic developer using the carrier |
| EP1757993A2 (en) | 2005-08-25 | 2007-02-28 | Powdertech Co., Ltd. | Carrier for electrophotographic developer, and electrophotographic developer using the same |
| EP1962143A1 (en) | 2007-02-20 | 2008-08-27 | Powdertech Co., Ltd. | Resin-filled ferrite carrier for electrophotographic developer and electrophotographic developer using the ferrite carrier |
| US8168364B2 (en) | 2008-03-14 | 2012-05-01 | Powdertech Co., Ltd. | Resin-filled carrier for electrophotographic developer, and electrophotographic developer using the resin-filled carrier |
| US8431311B2 (en) | 2007-12-26 | 2013-04-30 | Powdertech Co., Ltd. | Resin-filled carrier for electrophotographic developer, and electrophotographic developer using the resin-filled carrier |
-
1977
- 1977-12-05 JP JP14511077A patent/JPS5478137A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5782853A (en) * | 1980-11-11 | 1982-05-24 | Canon Inc | Developing method |
| JPS5786837A (en) * | 1980-11-19 | 1982-05-31 | Canon Inc | Preparation of electrophotographic developing carrier |
| JPS6356980B2 (en) * | 1980-11-19 | 1988-11-09 | Canon Kk | |
| JPS58108550A (en) * | 1981-12-23 | 1983-06-28 | Fujitsu Ltd | Carrier for magnetic brush development |
| JPS6240703B2 (en) * | 1981-12-23 | 1987-08-29 | Fujitsu Ltd | |
| JPH03255462A (en) * | 1990-03-06 | 1991-11-14 | Tomoegawa Paper Co Ltd | Two-component developer for electrophotography and production thereof |
| EP1729180A1 (en) | 2005-05-31 | 2006-12-06 | Powdertech Co., Ltd. | Ferrite core material for resin-filled type carrier, resin-filled type carrier, and electrophotographic developer using the carrier |
| US8628905B2 (en) | 2005-05-31 | 2014-01-14 | Powdertech Co. Ltd. | Ferrite core material for resin-filled type carrier, resin-filled type carrier, and electrophotographic developer using the carrier |
| EP1757993A2 (en) | 2005-08-25 | 2007-02-28 | Powdertech Co., Ltd. | Carrier for electrophotographic developer, and electrophotographic developer using the same |
| EP1962143A1 (en) | 2007-02-20 | 2008-08-27 | Powdertech Co., Ltd. | Resin-filled ferrite carrier for electrophotographic developer and electrophotographic developer using the ferrite carrier |
| US8431311B2 (en) | 2007-12-26 | 2013-04-30 | Powdertech Co., Ltd. | Resin-filled carrier for electrophotographic developer, and electrophotographic developer using the resin-filled carrier |
| US8168364B2 (en) | 2008-03-14 | 2012-05-01 | Powdertech Co., Ltd. | Resin-filled carrier for electrophotographic developer, and electrophotographic developer using the resin-filled carrier |
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