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:
Mar. 23, 2010
Filed:
Jun. 21, 2005
Lydia Drews-nicolai, Köln, DE;
Siegfried Bluemel, Ratingen, DE;
Lydia Drews-Nicolai, Köln, DE;
Siegfried Bluemel, Ratingen, DE;
Kronos International, Inc., Leverkusen, DE;
Abstract
The invention relates to a weather resistant titanium dioxide pigment with good optical properties having a SiOdense skin doped with metal atoms. Particularly suitable elements for doping are tin, zirconium and titanium. The SiOdense skin is composed of multiple layers whereby the innermost layer does not contain any significant quantity of metal atoms. The coating according to the invention is produced by adding the components to the alkaline suspension (pH at least 9) one after the other with a sliding pH. Complete formation of the doped SiOdense skin requires that the pH subsequently be lowered to below 9. The pigment is particularly suitable for use in surface coatings and plastics.