Method for reducing the c1-c2-aldehyde content formed from...

Details Method for reducing the c1-c2-aldehyde content formed from... Method for reducing the c1-c2-aldehyde content formed from...

C - Chemistry, Metallurgy

08

F

C08F 6/00 (2006.01) C07B 63/04 (2006.01) C07C 29/94 (2006.01)

Patent

CA 2326337

The invention relates to a method for reducing the content of small quantities of C1-C2-aldehydes formed from organic compounds with -CH2-CHR-O- and/or -CH2- CH(OH)-groups (R=H, C1-C4-alkyl) as a result of radical action, to 1 ppm by adding compounds which react with said aldehyde groups. Substances with the aforementioned groups also include many emulsifiers and protective colloids used in polymer chemistry, such as polyethylene glycols, polyvinyl alcohols or products of ethoxylation of long-chained alcohols, phenols or amines. The inventive method is particularly useful for treating polymer dispersions produced by radical polymerisation of monomers in the presence of these types of emulsifiers or protective colloids and enables the production of aldehyde- free polymer dispersions which can then be used for sanitary and hygiene products.

A partir de composés organiques renfermant des groupements -CH¿2?-CHR-O- et/ou -CH¿2?-CH(OH)- (où R = H, alkyle en C¿1?-C¿4?), il se forme, par effet radicalaire, de petites quantités d'aldéhydes en C¿1?-C¿2?, dont la teneur peut être réduite à ?1 ppm, conformément au procédé de l'invention, par addition de composés réagissant avec les groupes aldéhyde. Les substances renfermant les groupements précités comprennent entre autres de nombreux émulsifiants et colloïdes protecteurs, tels que polyéthylèneglycols, alcools polyvinyliques ou produits d'éthoxylation d'alcools, phénols ou amines à chaînes longues. Le procédé revêt une importance particulière pour le traitement de dispersions polymères obtenues par polymérisation radicalaire de monomères en présence de tels émulsifiants ou colloïdes protecteurs et permet la fabrication de dispersions polymères exemptes d'aldéhydes ainsi que leur utilisation pour des articles sanitaires et hygiéniques.

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