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:
May. 08, 1984
Filed:
Sep. 30, 1982
Applicant:
Inventors:
Peter B Howard, Cleveland, GB;
Derek O'Donnell, Cleveland, GB;
Assignee:
Tioxide Group PLC, Cleveland, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
106300 ; 1063 / ; 106309 ;
Abstract
Titanium dioxide pigment of improved durability in paints comprises a particulate core of rutile titanium dioxide having an inner coating on the core of an oxide or hydrous oxide of zirconium, and a coating of dense amorphous silica on the inner coating. The pigment optionally has an outer coating of a hydrous oxide of aluminium. The pigments contain the oxide of hydrous oxide of zirconium in an amount of up to 5% expressed as ZrO.sub.2 and an amount of dense amorphous silica of up to 12% by weight expressed as SiO.sub.2 on the weight of TiO.sub.2. The pigments when incorporated in paints have extremely high durability.