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:
Apr. 30, 2002
Filed:
Sep. 29, 2000
Robert Rupaner, Guaratingueta, BR;
Martin Scholtissek, Mannheim, DE;
Karl-Heinz Schumacher, Neustadt, DE;
Maximilian Angel, Schifferstadt, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
Organic compounds containing —CH —CHR—O— and/or —CH —CH(OH)— groupings (R=H, C -C -alkyl) produce, under the action of free radicals, small amounts of C -C -aldehydes, the content of which can be reduced to <1 ppm according to the novel process by adding compounds which can react with the aldehyde groups. The materials containing said groupings include many emulsifiers and protective colloids used in polymer chemistry, such as polyethylene glycols, polyvinyl alcohols or ethoxylation products of long-chain alcohols, phenols or amines. The process is of particular importance for the treatment of polymer dispersions which have been prepared by free-radical polymerization of monomers in the presence of such emulsifiers or protective colloids, and permits the preparation of aldehyde-free polymer dispersions and their use for sanitary and hygiene articles.