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. 10, 1984
Filed:
Mar. 31, 1982
Wolfgang Fabian, Wilhelmsfeld, DE;
Rudolf Polster, Frankenthal, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for purifying crude organic pigments, wherein the crude pigment is suspended in a mixture of two organic liquids which are partially or completely immiscible with one another, the suspension is mixed at 50.degree.-180.degree. C. until equilibrium has been reached, the phases are allowed to separate, the phase containing the impurities (i.e. the first liquid) is separated off and the purified pigment is isolated from the other phase (i.e. the second liquid). Finely divided crude pigments can, directly after purification, be converted, while in the second liquid, into pigmentary forms. The process gives pigments of high purity, which after conversion into pigmentary forms give deep, brilliant colorations.