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:
Sep. 11, 1990
Filed:
Dec. 06, 1985
Roger Lacroix, Village-Neuf, FR;
Edmond Ruhlmann, St. Louis, FR;
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
The invention describes a process for the preparation of concentrated aqueous, substantially salt-free solutions of aminotriazinyl reactive dyes, which process comprises starting from a dye which contains sulfo groups and one or more radicals capable of reaction with cyanuric halide, said dye being at least partly in the form of the ammonium salt, reacting said dye with cyanuric halide, in the presence of lithium hydroxide, and deionizing and concentrating the salt-containing synthesis solution by a membrane separation process. The so prepared mixed lithium/ammonium salts of the acid aminotriazinyl reaction dyes are readily water soluble and are suitable for the preparation of concentrated storage stable dye solutions.