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. 12, 1976
Filed:
Mar. 17, 1975
Joachim Ribka, Offenbach (Main), DT;
Wolfgang Rieper, Frankfurt am Main, DT;
Reinhard Zunker, Kelkheim, Taunus, DT;
Hoechst Aktiengesellschaft, Frankfurt am Main, DT;
Abstract
Monoazo dyestuffs of the formula ##SPC1## Wherein R.sub.1, R.sub.2 and R.sub.3 are identical or different and are hydrogen, alkyl or alkoxy, preferably having 1 to 2 carbon atoms, or halogen, especially chlorine, X is hydrogen or halogen, preferably chlorine and A is acetoacetyl or and a process for preparing them by coupling diazotized amines of the general formula ##SPC2## With coupling components of the formula ##SPC3## Where R.sub.1, R.sub.2, R.sub.3, X and A have the above meaning. These new pigments may be used for dyeing and printing of material or synthetic materials. They have good fastness properties, especially an improved fastness to heat.