Powdery polyethercarboxylate-based polymeric compositions

C - Chemistry – Metallurgy – 08 – L

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C08L 71/02 (2006.01) C04B 20/10 (2006.01) C04B 24/32 (2006.01) C08J 3/20 (2006.01) C08K 3/00 (2006.01)

Patent

CA 2362378

A description is given of pulverulent polymer compositions based on polyether carboxylates, which are characterized in that they comprise a) from 5 to 95% by weight of a water-soluble polymer made up of polyoxyalkylene-containing structural units, carboxylic acid and/or carboxylic anhydride monomers and, if desired, further monomers, and b) from 5 to 95% by weight of a finely divided mineral support material having a specific surface area of from 0.5 to 500 m2/g (determined by the BET method in accordance with DIN 66 131). These pulverulent polymer compositions, which can contain up to 90% by weight of polyether carboxylate, have a significantly increased sticking and caking resistance compared to spray-dried products and have further advantages when they are used in cement--containing building material mixtures.

Cette invention concerne des compositions polymères en poudre à base de polyéthercarboxylates, qui se caractérisent en ce qu'elles contiennent a) 5 à 95 % en poids d'un polymère soluble dans l'eau et constitué d'éléments structuraux contenant le groupe polyoxyalkylène, de monomères d'acide carboxylique, de monomères d'anhydride d'acide carboxylique et éventuellement d'autres monomères et b) 5 à 95 % en poids d'un matériau de support minéral finement divisé présentant une surface spécifique de 0,5 à 500 m<2>/g (mesurée selon la méthode BET conformément à la norme DIN 66 131). Ces compositions polymères en poudre pouvant contenir jusqu'à 90 % en poids de polyéthercarboxylate possèdent une résistance au collage et à la cuisson nettement plus élevée que celle de produits séchés par pulvérisation et présentent d'autres avantages lorsqu'elles sont utilisées dans des mélanges de matériaux de construction contenant du ciment.

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