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:
Jan. 23, 2007
Filed:
Apr. 21, 2004
Applicants:
Michael Happ, Dormagen, DE;
Dieter Irmscher, Bergisch Gladbach, DE;
Wolfgang Podszun, Cologne, DE;
Rudiger Seidel, Sandersdorf, DE;
Wolfgang Zarges, Cologne, DE;
Inventors:
Michael Happ, Dormagen, DE;
Dieter Irmscher, Bergisch Gladbach, DE;
Wolfgang Podszun, Cologne, DE;
Rudiger Seidel, Sandersdorf, DE;
Wolfgang Zarges, Cologne, DE;
Assignee:
Lanxess Deutschland GmbH, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F 8/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature Tof from 70 to 120° C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature Tof from 120 to 180° C.