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:
Dec. 17, 2002
Filed:
Jan. 05, 2001
Applicant:
Inventors:
Edward Sung, Cincinnati, OH (US);
Kathleen M. Kozak, Fairfield, OH (US);
George H. Robertson, Loveland, OH (US);
Terrence R. Chamberlain, Cincinnati, OH (US);
Assignee:
Sun Chemical Corporation, Fort Lee, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B 4/800 ;
U.S. Cl.
CPC ...
C09B 4/800 ;
Abstract
A process for producing beta-phase quinacridone by (a) reacting 2,5-dianilino-terephthalic acid with polyphosphoric acid in the presence of 2,5-dianisidino-terephthalic acid at a reaction temperature of at least 85° C.; (b) diluting the reaction mixture with water; (c) drowning the diluted mixture in a water-miscible alkanol; (d) heating the slurry at a temperature of from 100 to 130° C. at a pressure of 20 to 50 psi; and (e) recovering the beta-phase quinacridone.