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:
Jul. 08, 1980
Filed:
Jul. 10, 1978
Applicant:
Inventors:
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09D / ; C09C / ; C09C / ; C09C / ;
U.S. Cl.
CPC ...
106 1405 ; 106296 ; 106304 ; 106306 ; 106 1439 ; 106 1425 ;
Abstract
An anti-corrosion pigment comprising about 30 to 70 mole % of an oxide of at least one metal selected from the group consisting of magnesium, calcium and zinc, about 70 to 30 mole % of Fe.sub.2 O.sub.3, and up to about 20 mole % of Cr.sub.2 O.sub.3, the pigment having a specific surface of about 1 to 30 m.sup.2 /g and exhibiting a weight loss of less than about 0.05% per gram of pigment by the Thomson corrosion test, is produced by calcining the corresponding metal oxides. The temperature is about 200.degree. to 650.degree. C. in the absence of chromium and about 200.degree. to 900.degree. C. when chromium is present.