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. 03, 1987
Filed:
Jun. 26, 1985
Andrew J Cleland, Somerset, NJ (US);
Engelhard Corporation, Menlo Park, NJ (US);
Abstract
A pigment comprising particles of uncalcined kaolin clay combined in the absence of a binder with an amount of an added source of zirconium ion, such as ammonium zirconium carbonate, at least sufficient to enhance optical character of a dried composition containing the pigment. In application, the pigment may be utilized in a coating for paper or other fibrous web substrate to produce sheet materials of enhanced opacity. Alternatively, the pigment may be employed as a filler in a fibrous web substrate to provide improved optical character of the material. Also disclosed is a method preparing a pigment, including preparing a dispersed slurry of clay particles in an aqueous medium, wherein the improvement comprises utilizing an uncalcined kaolin clay and introducing into the slurry in the absence of a binder the source of zirconium ion in an amount at least sufficient to enhance the optical character afforded by the pigment.