Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2011-01-18
2011-01-18
Chapman, Mark A (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S110100, C430S108100, C430S108700, C399S252000
Reexamination Certificate
active
07871749
ABSTRACT:
A non-magnetic one-component electrophotographic developing agent is provided having improved properties. The electrophotographic developing agent includes parent toner particles comprising a binder resin, a releasing agent, a colorant, and a charge control agent, and an external additive which is added to a surface of the parent toner particles, wherein the binder resin comprises a high viscosity polyester resin having a weight average molecular weight of about 90,000-140,000 and a gel content of less than about 5% and a low viscosity polyester resin having a weight average molecular weight of about 52,000-65,000 and a gel content of less than about 2%. According to an embodiment of the present invention, an electrophotographic developing agent having improved image gloss and fusing property, while ensuring durability may be prepared by using a blended combination of a high viscosity polyester resin and a low viscosity polyester resin.
REFERENCES:
patent: 5156937 (1992-10-01), Alexandrovich et al.
patent: 2002/0051923 (2002-05-01), Takayanagi et al.
patent: 2005/0208403 (2005-09-01), Shu et al.
patent: 2006/0057487 (2006-03-01), Nagayama et al.
Choi Seok-hoon
Kim Sang-deok
Lee Duck-hee
Seok Ki-won
Chapman Mark A
Roylance Abrams Berdo & Goodman L.L.P.
Samsung Electronics Co,. Ltd.
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