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. 18, 2011
Filed:
Sep. 05, 2008
Sheldon B. Davis, Nashua, NH (US);
Angelica M. Sanchez Garcia, Somerville, MA (US);
David M. Matheu, Somerville, MA (US);
Yakov E. Kutsovsky, Arlington, MA (US);
Sheldon B. Davis, Nashua, NH (US);
Angelica M. Sanchez Garcia, Somerville, MA (US);
David M. Matheu, Somerville, MA (US);
Yakov E. Kutsovsky, Arlington, MA (US);
Cabot Corporation, Boston, MA (US);
Abstract
The invention provides fumed silica comprising aggregates that have an aggregate size and a surface area that satisfy particular formulas relating aggregate size to surface area, as well as aggregates that exhibit particular viscosity, power law exponent index, and/or elastic modulus characteristics when dispersed in liquid media. The invention also provides processes of preparing such fumed silica by combining a silica precursor with a stream of combustible gas, combusting the stream, and producing a stream of combusted gas and fumed silica particles, wherein dopants are introduced, the time/temperature profile, or history, of the stream of combusted gas and fumed silica particles is adjusted to allow for post-quench aggregate growth, and/or additional silica precursor is introduced into the stream of combusted gas.