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:
Nov. 24, 2009
Filed:
Oct. 21, 2003
Eduard Michel, Frankfurt am Main, DE;
Ruediger Baur, Eppstein-Niederjosbach, DE;
Hans-tobias Macholdt, Darmstadt-Eberstadt, DE;
Norbert Kohl, Muenster, DE;
Eduard Michel, Frankfurt am Main, DE;
Ruediger Baur, Eppstein-Niederjosbach, DE;
Hans-Tobias Macholdt, Darmstadt-Eberstadt, DE;
Norbert Kohl, Muenster, DE;
Clariant Produkte (Deutschland) GmbH, Sulzbach, DE;
Abstract
A dye base sulfate and method of making are described. The dye base sulphate of formula (I) is produced with a residual amine content of less than 2000 ppm, as determined by HPLC, by precipitation of the dye base, made by Friedel-Crafts alkylation, substitution and hydrolysis, as the dye base sulphate is a) taken up in water and subjected to a first steam distillation then filtered and optionally dried at 50 to 180° C., b) the pressed cake is treated with water or the optionally dried dye base sulphate is moistened with water, c) subjected to a further steam distillation and filtration and d) dried at 50 to 180° C.