| (19) |
 |
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(11) |
EP 0 898 206 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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17.03.1999 Bulletin 1999/11 |
| (43) |
Date of publication A2: |
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24.02.1999 Bulletin 1999/08 |
| (22) |
Date of filing: 08.08.1998 |
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| (51) |
International Patent Classification (IPC)6: G03G 9/113 |
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| (84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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Designated Extension States: |
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AL LT LV MK RO SI |
| (30) |
Priority: |
20.08.1997 EP 97202551
|
| (71) |
Applicant: AGFA-GEVAERT N.V. |
|
2640 Mortsel (BE) |
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| (72) |
Inventors: |
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- Voets, Raphael
2640 Mortsel (BE)
- Tavernier, Serge,
c/o Agfa-Gevaert N.V.
2640 Mortsel (BE)
- Delen, Gerrit,
c/o Agfa-Gevaert N.V.
2640 Mortsel (BE)
- Bellinghausen, Rainer
29699 Bomlitz (DE)
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| |
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| (54) |
A method for coating carrier particles for use in electrostatic developers |
(57) A method for coating carrier particles for use in electrostatic developers is provided
comprising the steps of :
- bringing the carrier particles to be coated in a vessel equipped with means for agitating
the carrier particles, so that the carrier particles occupy less than 85 % by volume
of the vessel, and the agitation of the carrier particles is described by a Froude
number between 0.2 and 20,
- adding a solution containing between 6 and 60 % by weight with respect to the total
volume of the solution of chemical compounds for coating the carrier particles in
a solvent with a boiling point of A °C to the vessel at such a rate that, at any time,
the solvent is present in an amount lower than 1.25 10-4 ml per cm2 of surface of the carrier particles to be coated ,
- keeping the carrier particles in the vessel at a temperature of at most (A + 10) °C,
and
- continuously evacuating the solvent.