Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2007-07-31
2007-07-31
Chapman, Mark A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S110100, C430S137200, C399S252000, C399S253000
Reexamination Certificate
active
10863248
ABSTRACT:
The toner according to the present invention may be produced from a toner raw composition which comprises a foaming agent, a binder resin and a colorant, wherein the colorant comprises a black metal compound, the foaming agent has a volume-average particle diameter of 2 μm to 50 μm, the toner raw composition turns into a porous mixture while the foaming agent expands at melting and kneading the toner raw composition, and the toner obtained through milling and classifying the porous mixture has a specific density of 1.0 g/cm3to 1.3 g/cm3, wherein the specific density is determined as follows: 1 gram of toner is pressed at 400 kgf/cm2for five minutes in a discal cavity having a diameter of 20 mm, then the discal toner is removed; the discal toner volume (V) is calculated from the diameter and height, measured at 10 minutes after releasing the pressure on the discal toner, and the discal toner mass (W) is measured; then the specific density is determined from the following formula: Specific Density (ρT)=W/V.
REFERENCES:
patent: 2000-19775 (2000-01-01), None
Translation of JP 2000-19775.
U.S. Appl. No. 11/524,379, filed Sep. 21, 2006, Taniguchi et al.
Ito Tomiaki
Natori Yuji
Tosaka Hachiroh
Chapman Mark A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
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