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:
Oct. 03, 1978
Filed:
Jun. 17, 1977
Konrad Opitz, Liederbach, Taunus, DE;
Josef Landler, Hofheim, Taunus, DE;
Erhard Worfel, Hattersheim, Main, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Concentrated dyeing compositions containing up to 45% by weight of one or more metal-free or metal complex azo dyestuffs containing one or more sulfo groups and one or more reactive groups, and containing buffer substances and having a pH of from 3 to 7, which may easily be prepared by diazotization and coupling of stoichiometrical amounts of a diazotizable amino compounds with a stoichiometrical amount of a nitrite and with a coupling component without addition of an acid but with the proviso that at least the diazo or coupling component contain at least one free acid group, such as sulfo group; these compositions are salt-free or practically salt-free and are very well suitable for the preparation of usual dyeing liquors and printing pastes useful in dyeing wool, silks, polyamide fibers and natural or regenerated cellulose.