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
Peter B Howard, Cleveland, GB;
Derek O'Donnell, Cleveland, GB;
Tioxide Group PLC, Cleveland, GB;
Abstract
Titanium dioxide pigment having a high durability when used in paints comprises a particulate core of rutile titanium dioxide having an inner coating of dense amorphous silica on which is carried an outer coating of a hydrous oxide of zirconium. Optionally the pigment has an outer coating of a hydrous oxide of aluminum. The amount of dense amorphous silica is up to 12% by weight expressed as SiO.sub.2 and the amount of hydrous oxide of zirconium is up to 5% expressed as ZrO.sub.2 on the weight of TiO.sub.2. The outer coating of hydrous oxide of aluminium can be present in an amount of up to 6% by weight expressed as Al.sub.2 O.sub.3 on the weight of TiO.sub.2. A combination of these coatings has been found to be extremely advantageous in producing a paint containing the pigment having a very good durability and resistance to weathering.