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:
Mar. 06, 1990
Filed:
Jun. 23, 1988
Applicant:
Inventor:
Camilla A Rice, Sandersville, GA (US);
Assignee:
E.C.C. America Inc., Atlanta, GA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
106461 ; 106467 ; 106468 ;
Abstract
In the method for producing a low abrasion calcined kaolin clay pigment by providing a feed kaolin which is at least sufficiently fine that substantially 100% by weight of the particles are of less than 1 micrometer E.S.D., and heating said feed in a calciner to a temperature of at least 900.degree. C., and under conditions such that substantially none of said kaolin is heated to a temperature in excess of 1100.degree. C.; a reduction in the abrasivity of the calcined product is achieved by incorporating into the feed from 1 to 4% by weight of MgCO.sub.3 and/or Mg(OH).sub.2.