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:
May. 01, 2007
Filed:
May. 03, 2005
George N. Robertson, Loveland, OH (US);
Edward H. Sung, Cincinnati, OH (US);
George N. Robertson, Loveland, OH (US);
Edward H. Sung, Cincinnati, OH (US);
Sun Chemical Corporation, Parsippany, NJ (US);
Abstract
This invention relates to a method for production of nanoscale size quinacridones through a wet-salt attrition process by combining a crude quinacridone pigment in the presence of (i) an inorganic salt, (ii) an organic liquid in which the quinacridone pigment and salt are substantially insoluble, and (iii) a quinacridone derivative in an amount less than 10 wt. % relative to the quinacridone pigment; discharging the ground quinacridone pigment into water; adding an acid to produce a solution pH of 1.5 or lower; and isolating the quinacridone pigment.