Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Reexamination Certificate
2005-04-05
2005-04-05
Goodrow, John (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
C430S108700, C430S137110, C399S252000
Reexamination Certificate
active
06875550
ABSTRACT:
A non-magnetic single-component toner8of the present invention has toner mother particles8a, and external additives12comprising: two hydrophobic silicas13, 14of which particle diameters are different from each other, i.e. a mean primary particle diameter of 7 nm to 12 nm and a mean primary particle diameter of 40 nm to 50 nm, and a hydrophobic rutile/anatase type titanium oxide15having a spindle shape of which major axial diameter is in a range from 0.02 nm to 0.10 nm and the ratio of the major axial diameter to the minor axial diameter is set to be 2 to 8, wherein the external additives12adhere to the toner mother particles8a. By the hydrophobic silicas13, 14having work function smaller than the work function of the toner mother particles8a, the negative charging property is imparted to the toner mother particles8aand the fluidity is also insured. On the other hand, by mixing and using hydrophobic rutile/anatase type titanium oxide particles15having work function larger than or equal to the work function of the toner mother particles8atogether with the hydrophobic silicas13, 14, the non-magnetic single-component toner8is prevented from excessively charged. Therefore, the amount of fog toner on non-image portions is reduced, the transfer efficiency is further improved, the charging property is further stabilized, and the production of reverse transfer toner is further inhibited.
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Kadota Takuya
Kunugi Masanao
Miyakawa Nobuhiro
Takano Hidehiro
Yasukawa Shinji
Goodrow John
Seiko Epson Corporation
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