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:
Feb. 21, 1978
Filed:
Sep. 30, 1976
Alvin Allen, Claymont, DE (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A coated titanium dioxide pigment and the process for its preparation consisting essentially of a core of pigmentary titanium dioxide (TiO.sub.2), a dense inner coating of dense amorphous silica (SiO.sub.2) in an amount from 1 to 10% by weight, based on the uncoated pigment, and, optionally, up to 15% of alumina (Al.sub.2 O.sub.3) and a porous outer coating of porous silica (SiO.sub.2) and alumina (Al.sub.2 O.sub.3), said porous silica being present in an amount from 0.5 to 15% by weight and said alumina being present in an amount from 0 to 15% by weight, based on the uncoated pigment. As a component of coating compositions, this pigment providesa high degree of hiding power and durability for indoor and outdoor applications.