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:
May. 07, 1991
Filed:
Apr. 27, 1989
Applicant:
Inventors:
Heinz-Dieter Sluma, Grossostheim, DE;
Dieter Huff, Obernburg, DE;
Assignee:
Akzo N.V., Arnhem, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J / ; C08G / ;
U.S. Cl.
CPC ...
521 27 ; 521 29 ; 525534 ;
Abstract
The sulfonation of aromatic polyether sulfones in a controllable manner is possible by means of sulfur trioxide in concentrated sulfuric acid as solvent. By maintaining a sulfur trioxide content of less than 6 percent by weight, based on the solvent, and a reaction temperature of less than 30.degree. C., side reactions and degradation reactions are to a large extent suppressed. The resultant products are suitable for preparation of membranes.