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OwnerJoerg Neubauer, Anette Wagner +1inventors
InventorsJoerg Neubauer, Anette Wagner, Sonja Menz
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The present invention provides additives for dry mix or tape joint compound compositions comprising one or more cellulose ether powders containing on its surface one or more hydrophobic alkali swellable emulsion polymer (HASE), preferably, one that is not crosslinked or which comprises, in copolymerized form, no multi-ethylenically unsaturated monomer, and, optionally, an inorganic basic filler. The present invention also provides methods to make the additive comprising kneading at from 50 to 120° C. a wet cellulose ether mixture containing from 50 to 80 wt. % of water with from 0.5 to 25 wt. %, based on total cellulose ether solids, of the hydrophobic alkali swellable emulsion polymer; if desired, adding an inorganic basic filler, and drying and grinding. The additive can be combined with 0.1 to 20 wt. %, based on total cellulose ether solids, of a dry polyacrylamide.
A method for making compositions for use as gypsum dry mix or gypsum tape joint compound additives comprise kneading at elevated temperature of from 50 to 120° C. a wet cellulose ether mixture containing from 60 to 80 wt. % of water, one or more cellulose ether, and from 0.5 to 25 wt. %, as solids, based on the total weight of cellulose ether solids, of a hydrophobic alkali swellable emulsion (HASE) polymer additive to form an additive;
A dry mix composition comprising gypsum or calcium sulfate and a dry mix additive comprising one or more cellulose ether powders wherein the powder of cellulose ethers contains on its surface from 2.5 to 20 wt. %, as solids, based on the total weight of cellulose ether solids, of a hydrophobic alkali swellable emulsion (HASE) polymer additive.
Dependencies are inferred from the claim text.