| (19) |
 |
|
(11) |
EP 0 347 800 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
27.02.1991 Bulletin 1991/09 |
| (43) |
Date of publication A2: |
|
27.12.1989 Bulletin 1989/52 |
| (22) |
Date of filing: 19.06.1989 |
|
| (51) |
International Patent Classification (IPC)4: G03G 9/087 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB |
| (30) |
Priority: |
23.06.1988 JP 153561/88
14.09.1988 JP 230536/88
14.09.1988 JP 230537/88
|
| (71) |
Applicants: |
|
- MITSUBISHI GAS CHEMICAL COMPANY, INC.
Tokyo, 100 (JP)
- Nippon Gohsei Kagaku Kogyo
Kabushiki Kaisha
Osaka (JP)
|
|
| (72) |
Inventors: |
|
- Matsumura, Akira
Suita-shi
Osaka (JP)
- Gaku, Morio
c/o Mitsubishi Gas Chemical Co., Inc.
Katsushika-ku
Tokyo (JP)
- Itou, Tomiji
Ogaki-shi
Gifu (JP)
- Kinbara,Hidenori
Mitsubishi Gas Chemical Co., Inc.
Katsushika-ku
Tokyo (JP)
|
| (74) |
Representative: Hansen, Bernd, Dr.rer.nat. et al |
|
Hoffmann, Eitle & Partner
Patentanwälte
Postfach 81 04 20
81904 München
81904 München (DE) |
|
| |
|
| (54) |
Toner for electrostatic images |
(57) A toner for developing electrostatic images containing a resin selected from a saturated
polyester resin, an acrylic resin, and an epoxy resin as a binder resin component,
wherein said resin has a carboxyl group or a glycidyl group and is used as a resin
composition contining (a) from 0.5 to 10 parts by weight of a polyfunctional cyanic
acid ester having at least two cyanato groups in the molecule or a prepolymer of the
cyanic acid ester per 100 parts by weight of the resin and (b) a curing catalyst for
the component (a).