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:
Jan. 16, 1990
Filed:
May. 27, 1988
Applicant:
Inventors:
Clemens Aderhold, Krefeld, DE;
Hans-Joachim Rohrborn, Neukirchen-Vluyn, DE;
Assignee:
Metallgesellschaft Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01F / ; C01F / ; C08K / ;
U.S. Cl.
CPC ...
106461 ; 106471 ; 423544 ;
Abstract
Barium sulfate which has a chemically reactive surface is produced by a precipitation of barium ions by means of sulfate ions in an aqueous medium. In order to provide barium sulfate as a filler having functional properties, the precipitation is effected as a coprecipitation in the presence of additional anions of water-soluble compounds, which anions are coprecipitable with barium ions to form difficulty soluble barium compounds. The reactive product which contains heteroatoms is subjected to an aftertreatment which is suitable for the use that is intended in a given case.