| 发明名称 |
Electrostatographic developer composition |
| 摘要 |
PCT No. PCT/EP94/01855 Sec. 371 Date Dec. 6, 1994 Sec. 102(e) Date Dec. 6, 1994 PCT Filed Jun. 7, 1994 PCT Pub. No. WO95/00884 PCT Pub. Date Jan. 5, 1995This invention provides an electrostatographic developer composition comprising carrier particles and toner particles with a toner particle size distribution having a volume average particle size (T) such that 4 m mu </=T</=12 mu m and an average charge (absolute value) pro diameter in femtocoulomb/10 mu m (CT) after triboelectric contact with said carrier particles such that 1 fC/10 mu m</=CT</=10 fc/10 mu m characterised in that (i) said carrier particles have a saturation magnetization value, Msat, expressed in Tesla (T) such that Msat>/=0.30 T (ii) said carrier particles have a volume average particle size (Cavg) such that 30 mu m</=Cavg</=60 mu m (iii) said volume based particle size distribution of said carrier particles has at least 90% of the particles having a particle diameter C such that 0.5 Cavg</=C</=2Cavg (iv) said volume based particles size distribution of said carrier particles comprises less than b % particles smaller than 25 mu m wherein b=0.35x(Msat)2xP with Msat: saturation magnetization value, Msat, expressed in T P: the maximal field strength of the magnetic developing pole expressed in kA/m (v) said carrier particles comprise a core particle coated with a resin coating in an amount (RC) such that 0.2% w/w</=RC</=2% w/w.
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| 申请公布号 |
US5545501(A) |
申请公布日期 |
1996.08.13 |
| 申请号 |
US19940347346 |
申请日期 |
1994.12.06 |
| 申请人 |
AGFA-GEVAERT, N.V. |
发明人 |
TAVERNIER, SERGE;RUTTENS, FRANK;VERHECKEN, ANDR+E,ACU E+EE;MAMPAEY, JOZEF;JOLY, LUDOVICUS |
| 分类号 |
G03G9/00;G03G9/08;G03G9/087;G03G9/10;G03G9/107;G03G9/113;(IPC1-7):G03G9/107 |
主分类号 |
G03G9/00 |
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