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:
Oct. 23, 2012
Filed:
May. 18, 2012
Franz-felix Kuppinger, Marl, DE;
Axel Hengstermann, Senden, DE;
Guido Stochniol, Haltern am See, DE;
Günther Bub, Marl, DE;
Jürgen Mosler, Marl, DE;
Andreas Sabbagh, Bensheim, DE;
Franz-Felix Kuppinger, Marl, DE;
Axel Hengstermann, Senden, DE;
Guido Stochniol, Haltern am See, DE;
Günther Bub, Marl, DE;
Jürgen Mosler, Marl, DE;
Andreas Sabbagh, Bensheim, DE;
Evonik Stockhausen GmbH, Krefeld, DE;
Abstract
In one aspect, a process for the preparation of a superabsorbent polymer is described herein. In some embodiments, the process comprises (I) preparing acrylic acid, wherein the process comprises (a) provision of a fluid Fhaving a composition comprising from about 5 to about 20 wt. % of hydroxypropionic acid, salts thereof, or mixtures thereof; from about 0.1 to about 5 wt. % of inorganic salts; from about 0.1 to about 30 wt. % of organic compounds which differ from hydroxypropionic acid; from 0 to about 50 wt. % of solids; and from about 20 to about 90 wt. % of water; (a) dehydration of said hydroxypropionic acid to give a fluid Fcontaining acrylic acid; and (a) purification of said fluid Fto give a purified acrylic acid phase comprising acrylic acid having a purity of at least 70 wt. %; and (II) polymerizing the acrylic acid of (I) to form a superabsorbent polymer.