| (19) |
 |
|
(11) |
EP 0 242 712 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
10.02.1988 Bulletin 1988/06 |
| (43) |
Date of publication A2: |
|
28.10.1987 Bulletin 1987/44 |
| (22) |
Date of filing: 08.04.1987 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT |
| (30) |
Priority: |
09.04.1986 JP 8186786
|
| (71) |
Applicants: |
|
- KANTO DENKA KOGYO CO., LTD.
()
- Höganäs AB
()
|
|
| (72) |
Inventors: |
|
- Kohno, Toshihiko
()
- Yokoe, Shigeo
()
- Oka, Kazuyoshi
()
- Engström, Ulf
()
- Larssen, Svenn-erik
()
|
|
| |
|
| (54) |
Carrier material for electrophotographic developers |
(57) An electrophotographic carrier material comprising a spherical core of hematite-containing
magnetite and a resinous coating layer applied thereon is provided. The carrier material
exhibits good copying characteristics, an improved durability and an enhanced stability
to the environmental factors such as humidity. The carrier material may have an appropriate
electrical resistivity by virtue of the presence of the hematite and the resinous
coating layer.