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:
Dec. 18, 1979
Filed:
May. 05, 1977
Detlef-Ingo Schutze, Bergisch-Gladbach, DE;
Hans-Samuel Bien, deceased, late of Burscheid, DE;
Petra Bien, heir, Burscheid, DE;
Daniel Bien, heir, Burscheid, DE;
Bayer Aktiengesellschaft, Leverkusen, DE;
Abstract
The invention relates to a novel process for the preparation of 1-acylamino-5(8)-chloroanthraquinones, which are starting materials for the preparation of vat dyes. It is characterized in that 1,5(8)-dichloroanthraquinones is reacted with ammonia at temperatures of 190.degree. to 240.degree. C., the amino groups in the reaction mixture are completely acylated and the more sparingly soluble diacylaminoanthraquinone is separated off from the more readily soluble monoacylaminochloroanthraquinone. The new process yields reaction products which are purer and cheaper than those which are obtained by conventional methods. Moreover there are smaller waste water problems.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile