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:
Apr. 30, 1991
Filed:
Feb. 14, 1990
Richard R Berube, Holmdel, NJ (US);
John S Babiec, Jr, Berwyn, PA (US);
M Phillip Jameson, Sommerville, NJ (US);
Andrew R Negele, Edison, NJ (US);
Mitchell J Willis, Macon, GA (US);
Engelhard Corporation, Iselin, NJ (US);
Abstract
A low-abrasion calcined kaolin opacifying pigment composed of particles in the size range of about 70 to 84% by weight finer than 2 microns and having a color defined by Hunter Trisitimulus values of 'L' within the range of 92 to 94, 'a' within the range of .sup.+ 1.0 to .sup.+ 2.2 and 'b' within the range of .sup.+6.4 to .sup.+ 7.5. The pigment is produced by novel wet processing including high solids degritting of a high iron, high titania content Tertiary kaolin without conventional fractionation, bleaching and dewatering to isolate a fine particle size fraction, followed by spray drying, pulverization, calcination and repulverization.