Powdery polyether carboxylate-based polymeric compositions

US6620879B1 · kind B1 · utility

Assignee

• Degussa Construction Chemicals GmbH · DE

Inventors

• Gerhard Albrecht · Prien am Chiemsee, DE
• Hubert Leitner · Traunwalchen, DE
• Alfred Kern · Schneeberg, DE
• Josef Weichmann · Pleiskirchen, DE

Key dates

• Filing date: Sep 24, 2001
• Grant date: Sep 16, 2003
• Expiry date: Sep 24, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2103/408
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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.