Clariant International Ltd

Clariant Finance (bvi) Limited

Claudia Diemel

Christoph Kayser

Dirk Fischer

Karl Heinz Heier

Katharina Berz

Gernold Botthof

Michael Schäfer

Jürgen Tonhauser

This invention relates to water-soluble or water-swellable polymers, containing a) 25-35 mol. % of one or more recurrent structural units of formula (1), where Rand Rrepresent hydrogen, methyl or ethyl, A represents a linear or branched C-C-alkylene, and Qstands for NH, Li, Na, K, &#xbd; Ca, &#xbd; Mg, &#xbd; Zn, &#x2153; Al, or organic ammonium ions of the formula [HNRRR], b) 3 to 8 mol. % of one or more recurrent structural units of formula (2), where Rrepresents hydrogen, methyl, or ethyl, Xstands for H, NH, Li, Na, K, &#xbd; Ca, &#xbd; Mg, &#xbd; Zn, &#x2153; Al, or organic ammonium ions of the formula [HNRRR], B is a linear or branched alkylene group with 1 to 6 carbon atoms, and n is a whole number between 0 and 5, and c) 57 to 72 mol. % of a (meth)acrylamide.

Water-soluble or water-swellable polymers as water loss reducers in cement slurries

The invention relates to a method for producing water-soluble or water-swellable polymers containing acryloyldimethyltaurate, neutral monomers, and monomers with carboxylate groups. The monomers undergo free radical polymerisation in precipitation in a polar solvent or solvent mixture, providing that an additional polar organic solvent is contained if the polar solvent contains 2-methyl-2-propanol, a ketone or both.

Method for producing polymers on the basis of acryloyldimethyltaurate, neutral monomers, and monomers with carboxylate groups

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Gelnhausen, Germany

Claudia Diemel