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:
Feb. 16, 1982
Filed:
May. 31, 1978
Applicant:
Inventors:
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ; C09B / ; C09B / ;
U.S. Cl.
CPC ...
260373 ; 2604 / ; 2604 / ; 260147 ; 260148 ; 260149 ; 260150 ; 260151 ; 260158 ; 260160 ; 260161 ; 260162 ; 260163 ; 260176 ; 260184 ; 260193 ; 260194 ; 260196 ; 260197 ; 260198 ; 260199 ; 260200 ; 260201 ; 260205 ; 260206 ; 260207 ; 2602071 ; 2602075 ; 260208 ; 2603145 ; 260335 ; 260459 ; 260336 ; 260372 ; 260374 ;
Abstract
Improved process for the sulfatation of the hydroxy group of a .beta.-hydroxy-ethylsulfonyl group present in compounds selected from the dyestuff class which comprises carrying out the reaction in a machine operating with a kneading action and effect and with the use of only 1 to 5 times the equimolar amount of a concentrated sulfuric acid, of oleum or sulfur dioxide itself. The .beta.-sulfatoethylsulfonyl group containing dyestuffs, thus prepared have a high purity and are obtained in a high yield and esterification rate. Above all, the novel process is distinguished by a highly reduced salt and acid content of the waste water.