Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Reexamination Certificate
2005-10-20
2010-10-12
Hendrickson, Stuart (Department: 1793)
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
C106S490000, C524S261000, C528S031000, C427S220000
Reexamination Certificate
active
07811540
ABSTRACT:
The invention provides a method of preparing hydrophobic silica particles comprising (a) providing an aqueous colloidal silica dispersion comprising about 5-70 wt. % of silica particles having an average overall particle size of about 10-1000 nm, wherein the silica particles comprise surface silanol groups, (b) combining the silica dispersion with about 3-75 μmole/m2(based on the BET surface area of the silica) of a silyl amine treating agent and optionally with other ingredients to provide a reaction mixture, wherein the reaction mixture has a pH of about 7 or more, and comprises no more than about 50 wt. % of an organic solvent, and (c) drying the dispersion to provide hydrophobic silica particles. The invention further provides a method of preparing a toner composition comprising combining the hydrophobic silica particles as recited above with toner particles to provide a toner composition.
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Cabot Corporation
Hendrickson Stuart
Liao Diana J
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