Sika Technology Ag

Anna Krapf

Ueli Sulser

Ulf Velten

Irene Schober

The present invention relates to emulsifying polymers, in particular to the use of these polymers for the stable emulsification of hydrophobic additives in aqueous concrete plasticizers.

Emulsifying polymers and their use

A process for preparing a polymer P having amide and ester groups in the solid state of aggregation, comprising (a) reacting a homo- or copolymer P1 of (meth)acrylic acid, itaconic acid or crotonic acid with at least one monohydroxy compound E at a temperature up to 200&#xb0; C. to give a polymer P2, so that anhydride groups form in addition to ester groups, (b) cooling the polymer P2 prepared in step (a) being cooled to below 60&#xb0; C. so that the polymer P2 is present in the solid state of aggregation or as supercooled melt, and (c) amidating the polymer P2 having anhydride groups and present in the solid state of aggregation or as supercooled melt with at least one amine compound A at temperatures below 60&#xb0; C., the amine compound A used in step (c) being present in the solid state of aggregation or on or in a solid carrier material.

Process for producing polymers having amide and ester groups in the solid state

The invention relates to a method for the production of a polymer (P) comprising amide and ester groups, whereby, in a first step, a homo- or co-polymer (P1) of (meth)acrylic acid is reacted with a monohydroxy compound (E) at a temperature of up to 200&#xb0; C., such that, in addition to ester groups, anhydride groups are formed and, in a second step, the anhydride groups formed in the first step are reacted with a monoamine compound (A) at temperatures significantly below 100&#xb0; C. The invention further relates to polymers produced by the above method, the use thereof in hydraulic-setting compositions and said hydraulic-setting compositions before and after hardening by addition of water.

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Uitikon Waldegg, Switzerland

Anna Krapf