Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1999-11-12
2000-08-15
Martin, Roland
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430111, G03G 9097
Patent
active
06103441&
ABSTRACT:
A color toner for electrophotography is made of matrix toner particles, each matrix toner particle containing a binder resin, a coloring agent, and a charge control agent, and an externally added additive which includes (a) hydrophobically treated silica particles having a primary particle size of 0.01 to 0.03 .mu.m, (b) hydrophobically treated titanium oxide particles having a primary particle size of 0.01 to 0.03 .mu.m and a specific surface area of 60 to 140 m.sup.2 /g, and (c) hydrophobically treated silica particles having a specific surface area of 20 to 50 m.sup.2 /g and a bulk density of 100 to 250 g/l.
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Fushimi Hiroyuki
Shiraishi Keiko
Tomita Masami
Watanabe Yohichiroh
Martin Roland
Ricoh & Company, Ltd.
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