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:
Jun. 02, 1981
Filed:
Jan. 05, 1979
Wolfgang Lotsch, Beindersheim, DE;
Peter Hilbert, Bobenheim, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A process for converting finely particled agglomerated crude isoindoline pigments of the formula ##STR1## where A is ##STR2## and B is the radical of an unsubstituted or substituted barbituric acid, or A and B are both such a barbituric acid radical, into tinctorially valuable pigmentary forms, wherein the crude pigment, which consists of primary particles having a mean size of .ltoreq.0.1 .mu.m, is subjected to shearing forces in water, and thereafter the aqueous suspension is heated at from 90.degree. to 160.degree. C. in the presence or absence of a surfactant and the pigment is isolated. Easily dispersible, high-hiding to extremely high-hiding pigments are obtained, which give brilliant colorations of improved lightfastness and fastness to weathering.