| 摘要 |
A description is given of pulverulent polymer compositions based on polyether carboxylates, which are characterized in that they comprisea) 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, andb) 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.
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