The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2010
Filed:
Oct. 20, 2005
Curtis E. Adams, Watertown, MA (US);
Curtis E. Adams, Watertown, MA (US);
Cabot Corporation, Boston, MA (US);
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/m(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.