Method for reducing the C1-C2-aldehyde content formed from compounds with -CH2-CHR-O-or-CH(OH)-groups

US6380353B1 · kind B1 · utility

Assignee

• BASF SE

Inventors

• Robert Rupaner · Ludwigshafen, DE
• Martin Scholtissek · Monsheim, DE
• Karl-Heinz Schumacher · Ludwigshafen, DE
• Maximilian Angel · Mutterstadt, DE

Key dates

• Filing date: Sep 29, 2000
• Grant date: Apr 30, 2002
• Expiry date: Sep 29, 2020

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C29/94
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Organic compounds containing &#8212;CH2&#8212;CHR&#8212;O&#8212; and/or &#8212;CH2&#8212;CH(OH)&#8212; groupings (R=H, C1-C4-alkyl) produce, under the action of free radicals, small amounts of C1-C2-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.