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. 31, 1979
Filed:
Oct. 28, 1975
Applicant:
Inventors:
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ;
U.S. Cl.
CPC ...
260182 ; 260157 ; 260163 ; 260174 ; 260175 ; 260177 ; 260178 ; 260179 ; 260180 ; 260181 ; 260183 ; 260184 ; 260197 ; 260198 ; 260199 ; 260208 ;
Abstract
The invention relates to the preparation of concentrated solutions of azo dyestuffs containing ionic groups, by precipitating during the diazotization and/or coupling reaction and/or after the coupling reaction the foreign ions which lower the solubility of the dyestuffs and separating off these ions as sparingly soluble salts. In this way dyestuff solutions which are stable to storage at room temperature and have a dyestuff content of 10 to 50 percent by weight are obtained.