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:
Mar. 10, 1987
Filed:
Jul. 16, 1985
Applicant:
Inventor:
Nitya G Podder, Birsfelden, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
B01F / ; C09B / ; D06P / ;
U.S. Cl.
CPC ...
8527 ; 8440 ; 8554 ; 8606 ; 8680 ; 8611 ; 8917 ; 8924 ;
Abstract
The invention relates to a process for the preparation of a storage stable aqueous formulation of anionic dyes, which process comprises treating the aqueous dye solution and/or dispersion with a polymeric anion exchanger, simultaneously and/or subsequently subjecting the resin-bonded dye to a mechanical wet grinding, in the presence of a nonionic dispersant, and adding to the resultant aqueous dispersion the assistants customarily present in the liquid dye formulations. The process makes it possible to precipitate anionic dyes in virtually quantitative yield from aqueous solution and to prepare storage-stable dye dispersions.