Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2009-03-05
2011-10-18
Le, Hoa (Department: 1721)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S108600, C430S111350, C430S111400
Reexamination Certificate
active
08039184
ABSTRACT:
Provided is a two-component developer with which degradation of development is inhibited even in the case of prolonged use, and thereby a high quality image exhibiting high resolution and sufficient image density can be formed for a long duration. Also disclosed is a two-component developer possessing a carrier and a toner, wherein the carrier in which magnetic material powder is dispersed in a binder resin containing a phenol formaldehyde resin has a shape coefficient SF-1 of 1.0-1.2, a shape coefficient SF-2 of 1.1-2.5 and a volume-based median particle diameter of 10-100 μm, and the toner possesses a colored particle and an external additive particle, wherein the external additive particle comprises a titanic acid compound and iron, and the iron content is 100-1,000 ppm, based on the titanic acid compound.
REFERENCES:
patent: 2003/0180644 (2003-09-01), Nanya et al.
patent: 2008/0038653 (2008-02-01), Yamazaki et al.
Anno Masahiro
Nakamura Masahiko
Onaka Kenichi
Onishi Junya
Tonegawa Naoya
Konica Minolta Business Technologies Inc.
Le Hoa
Lucas & Mercanti LLP
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