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:
Jun. 20, 1995
Filed:
Mar. 24, 1993
Applicant:
Inventors:
Walter H Waddell, Pittsburgh, PA (US);
Larry R Evans, Jeannette, PA (US);
Jeffrey H Harwell, Norman, OK (US);
John H O'Haver, Norman, OK (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08K / ;
U.S. Cl.
CPC ...
523200 ; 524761 ; 523205 ; 523209 ; 428407 ;
Abstract
Particulate amorphous silica, surfactant, monomer, and an aqueous solvent are brought into mutual contact so that as equilibrium is approached the concentration of the surfactant in the liquid phase is below, at, or slightly above the critical micelle concentration; the monomer is then polymerized to form polymeric film associated with at least a portion of the surface of the particulate amorphous silica, the polymeric film being (i) homopolymer of an aliphatic monomer or (ii) copolymer of at least two different monomers.