Basf Aktiengesellschaft

Basf Se Corporation

Hans-Jürgen Raubenheimer

Axel Sanner

Matthias Kroner

Volker Schehlmann

Dieter Faul

Karl-Heinz Büchner

Johannes Perner

Matthias Gerst

Kathrin Michl

Matthias Laubender

Stephan Kothrade

Katrin Zeitz

Reinhold Dieing

Peter Hössel

Jürgen Pfister

Alkylpolyalkylene glycol esters of monoethylenically unsaturated carboxylic acids are prepared by esterifying (a) monoethylenically unsaturated carboxylic acids with (b) polyalkylene glycols which are endcapped at one end, in the absence of a solvent and in the presence of polymerization inhibitors and esterification catalysts at not more than 160&#xb0; C. by a process in which the esterification is first carried out under atmospheric pressure or at up to 50 bar, the water formed in the esterification is then distilled from the reaction mixture at from 10 to 500 mbar and the esterification is then continued under atmospheric pressure or at up to 50 bar.

Method for producing alkylpolyalkylene glycol esters of monoethylenically unsaturated carboxylic acids

A process for the preparation of water-soluble polymers of esters of ethylenically unsaturated carboxylic acids and polyalkylene glycols by azeotropic esterification, in the presence of organic solvents which form an azeotrope with water, of ethylenically unsaturated carboxylic acids with polyalkylene oxides which are capped at one end by end groups, to a degree of at least 85 wt %, followed by free-radical polymerization of the resulting esters optionally together with other ethylenically unsaturated monomers, in aqueous medium, wherein the organic solvents are removed by azeotropic distillation from the reaction mixture during polymerization and the water that is removed by distillation is recycled or the quantity of water removed by distillation from the reaction mixture is replaced by a feed of fresh water.

Method for producing water soluble polymer of esters from ethylenically unsaturated carboxylic acids and polyalkylene glycols

The present invention provides a process for preparing aqueous copolymer solutions by polymerizing ethylenically unsaturated compounds in the presence of foam inhibitors.

Preparation of an aqueous copolymer solution

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Ketsch, Germany

Hans-Jürgen Raubenheimer