Toner for developing electrostatic image, process-cartridge and

Details Toner for developing electrostatic image, process-cartridge and Toner for developing electrostatic image, process-cartridge and

1996-10-25

1999-10-26

Rodee, Christopher D.

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

430109, 430124, G03G 9097

Patent

active

059725532

ABSTRACT:
A toner for developing an electrostatic image is composed from a composition including: polymer components, a colorant, a wax and a charge-controlling agent. The polymer components are characterized by (a) containing substantially no THF (tetrahydrofuran)-insoluble content; (b) containing a THF-soluble content giving a GPC (gel permeation chromatography) chromatogram showing a main peak in a molecular weight region of 3.times.10.sup.3 -3.times.10.sup.4, and a sub-peak or shoulder in a molecular weight region of 1.times.10.sup.5 -3.times.10.sup.6, and (c) including a low-molecular weight polymer component having molecular weights of below 5.times.10.sup.4 on the GPC chromatogram and an acid value A.sub.VL, and a high-molecular weight polymer component having molecular weights of at least 5.times.10.sup.4 and an acid value A.sub.VH satisfying A.sub.VL >A.sub.VH. The wax has an acid value A.sub.VWax satisfying A.sub.VL >A.sub.VWax and A.sub.VWax >0 (mgKOH/g). The toner is characterized by a good combination of low-temperature fixability and anti-offset characteristic, a stable chargeability, and freeness from sleeve ghost phenomenon.

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patent: 5478686 (1995-12-01), Kawakami et al.
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