| (19) |
 |
|
(11) |
EP 0 945 766 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
23.02.2000 Bulletin 2000/08 |
| (43) |
Date of publication A2: |
|
29.09.1999 Bulletin 1999/39 |
| (22) |
Date of filing: 25.03.1999 |
|
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| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
26.03.1998 JP 10013698
|
| (71) |
Applicant: TODA KOGYO CORP. |
|
Hiroshima-shi Hiroshima-ken (JP) |
|
| (72) |
Inventors: |
|
- Hayashi, Kazuyuki
Hiroshima-shi, Hiroshima-ken (JP)
- Morii, Hiroko
Hiroshima-shi, Hiroshima-ken (JP)
- Tanaka, Yasuyuki
Onada-shi, Yamaguchi-ken (JP)
- Ishitani, Seiji
Hiroshima-shi, Hiroshima-ken (JP)
|
| (74) |
Representative: Woods, Geoffrey Corlett |
|
J.A. KEMP & CO. Gray's Inn 14 South Square
London WC1R 5LX
London WC1R 5LX (GB) |
|
| |
|
| (54) |
Black non-magnetic composite particles for black toner and black toner using the same |
(57) Black non-magnetic composite particles for a Black toner of the present invention
comprising:
- (a) hematite and/or iron oxide hydroxide particles having an average particle diameter
of from 0.055 to 0.95 µm;
- (b) a coating on the surface of said hematite and/or iron oxide hydroxide particles,
comprising at least one organosilicon compound selected from:(1) organosilane compounds
obtainable by drying or heat-treating alkoxysilane compounds,(2) polysiloxanes or
modified polysiloxanes, and(3) fluoroalkyl organosilane compounds obtainable by drying
or heat-treating fluoroalkylsilane compounds; and
- (c) carbon black fine particles adhered on said coating, which have a particle diameter
of from 0.002 to 0.05 µm and which are present in an amount of from 1 to 25 parts
by weight per 100 parts by weight of said hematite and/or iron oxide hydroxide particles.