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:
Dec. 22, 1998
Filed:
Aug. 22, 1996
Howard W Jacobson, Wilmington, DE (US);
Andrew A Feng, Wilmington, DE (US);
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Rutile TiO.sub.2 pigment particles bearing coatings comprising: (a) an inner layer comprising about 0.05-1 percent by weight, based on the weight of the TiO.sub.2, of cerium radicals and about a stoichiometric amount of phosphate radicals, based on the amount of cesium radicals, (b) a second layer of about 0.1-4 percent by weight, based on the weight of the TiO.sub.2, of amorphous silica, and optionally (c) an outer layer of (1) about 0.5 to 8 percent by weight, based on the weight of the TiO.sub.2, of hydrous alumina or (2) hydrous alumina in the amount of about 0.5-8 percent, based on the weight of the TiO.sub.2, and associated therewith up to about a stoichiometric amount of phosphate radicals needed to form aluminum phosphate, the combined total weight of said coatings being about 2 to 12 percent by weight, based on the weight of the TiO.sub.2.