| (19) |
 |
|
(11) |
EP 0 429 294 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
12.06.1991 Bulletin 1991/24 |
| (43) |
Date of publication A2: |
|
29.05.1991 Bulletin 1991/22 |
| (22) |
Date of filing: 20.11.1990 |
|
| (51) |
International Patent Classification (IPC)5: G03G 9/09 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT NL |
| (30) |
Priority: |
20.11.1989 JP 299717/89
28.11.1989 JP 306597/89
30.11.1989 JP 308899/89
30.11.1989 JP 308900/89
30.11.1989 JP 308901/89
|
| (71) |
Applicant: MITA INDUSTRIAL CO. LTD. |
|
Osaka-shi
Osaka-fu 540 (JP) |
|
| (72) |
Inventors: |
|
- Tsubota, Noriaki
Himeji-shi,
Hyogo-ken (JP)
- Kubo, Masahiko
Yao-shi,
Osaka-fu (JP)
- Fuji, Kazuo
Higashi-osaka-shi,
Osaka-fu (JP)
- Edahiro, Kazuhisa
Hirakata-shi,
Osaka-fu (JP)
|
| (74) |
Representative: Cresswell, Thomas Anthony et al |
|
J.A. Kemp & Co.
14 South Square
Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB) |
|
| |
|
| (54) |
Toner for full colour development |
(57) A toner for full colour development in electrophotography, in which various colour
toners are overlapped, comprises a colouring agent and a binder resin having an electroconductivity
of 1.0 x 10⁻⁹ to 5.0 x 10⁻⁹ (s/cm). When this toner is used for the colour development,
the electric characteristics, developing characteristics and transfer characteristics
are almost equal to those of other colour toners used for the same image and the developed
toner quantities and transfer efficiencies can be made substantially equal and full
colour development can be carried out with an excellent image reproducibility.