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. 29, 1992
Filed:
Jan. 07, 1991
Applicant:
Inventors:
Harold Heller, Cologne, DE;
Friedrich Werner, Roesrath-Forsbach, DE;
Alfred Mitschker, Odenthal-Holz, DE;
Herbert V Diehl, Greensboro, NC (US);
Axel Schafer, Belford Roxo/Nova Ignazu, BR;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ; C08F / ;
U.S. Cl.
CPC ...
521 31 ; 521 25 ; 521 30 ; 521 38 ; 5253291 ; 5253292 ; 5253293 ; 525369 ; 5263171 ;
Abstract
The invention relates to an environment-friendly process for the preparation of weakly acid cation exchange resins by hydrolysis of crosslinked acrylonitrile bead polymers with an alkaline hydrolizing agent at elevated temperature, according to which the bead polymer and alkaline hydrolizing agent are brought together at elevated temperature only.