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. 16, 2001
Filed:
Mar. 26, 1999
Applicant:
Inventors:
Ronald W. Broadbent, Horsham, PA (US);
Dharmesh Chovatia, Bensalem, PA (US);
Assignee:
Cognis Corporation, Gulph Mills, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B 3/3145 ; B01F 3/12 ; B01D 1/904 ;
U.S. Cl.
CPC ...
C01B 3/3145 ; B01F 3/12 ; B01D 1/904 ;
Abstract
Silica is rendered hydrophobic by a catalyst-free, in-situ process that includes contact with a hydrophobing agent under vacuum at elevated temperature for a time sufficient to replace adsorbed water in the silica with the hydrophobing agent. The resulting dispersion of hydrophobic silica in an inert, liquid, hydrophobic carrier medium is then subjected to high shear forces for a time sufficient to produce a homogeneous dispersion of hydrophobic silica particles in a defoaming composition.