Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2011-05-03
2011-05-03
Chapman, Mark A (Department: 1721)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S123500, C430S123530, C430S123540, C399S252000
Reexamination Certificate
active
07935470
ABSTRACT:
A toner for electrophotography is provided including a binder resin, a colorant, a charge control agent, and a release agent, wherein a glass transition temperature (Tg) is over 55° C., a molecular weight distribution (MWD) is in the range of about 4.5 to 5.5 when a weight average molecular weight is in the range of about 45,000 to 55,000, and a compression elastic modulus is about 750 MPa or higher at room temperature. Mechanical properties of toner can be obtained at room temperature by controlling rheological properties of toner. The developing properties and fixing properties of toner for electrophotography can be improved by lowering viscosity at a high temperature, and thus image quality can be stabilized.
REFERENCES:
patent: 6497983 (2002-12-01), Iwa et al.
patent: 6682867 (2004-01-01), Kubo et al.
patent: 7001701 (2006-02-01), Fujii et al.
Cheong Min-young
Jeong Jae-hyeuk
Joo Hae-ree
Pang Kyeong
Shin Yo-da
Chapman Mark A
Roylance Abrams Berdo & Goodman L.L.P.
Samsung Electronics Co,. Ltd.
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