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. 20, 2007
Filed:
Aug. 02, 2002
Eberhard Fuchs, Frankenthal, DE;
Hans Martan, Frankenthal, DE;
Gerhard Nestler, Vienna, AT;
Klaus Joachim Mueller-engel, Stutensee Blankenloch, DE;
Eberhard Fuchs, Frankenthal, DE;
Hans Martan, Frankenthal, DE;
Gerhard Nestler, Vienna, AT;
Klaus Joachim Mueller-Engel, Stutensee Blankenloch, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
In a process for preparing water-absorbent resins based on acrylic acid, crude acrylic acid is firstly isolated from the reaction gases from the catalytic gas-phase oxidation of propane, propylene and/or acrolein. This is treated with an aldehyde scavenger and pure acrylic acid is separated by distillation from the treated crude acrylic acid, and this pure acrylic acid can be subjected directly to a free-radical polymerization.