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OwnerAmit Kumar Verma, Jörn Breckwoldt +1inventors
InventorsAmit Kumar Verma, Jörn Breckwoldt, Jörg Neubauer
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The present invention provides dry mixes for skim coat mortars having improved pot life and workability while reducing cellulose ether dosage comprising a white cement, one or more fillers having a sieve average particle size of from 15 to 60 microns, from 0.25 to 0.5 wt. % of one or more gel-like crosslinked cellulose ethers containing polyether groups, preferably, a mixed cellulose ether having polyoxypropylene dioxyethylene ether crosslinks, and from 1 to 2.5 wt. % of one or more polymer redispersible powders (RDP). At least one gel-like crosslinked cellulose ether has a crossover point as measured by oscillation rheometry, at which storage modulus (G′) and loss modulus (G″) intersect and are identical, of 1.0ω or less. The present invention also provides methods of using the dry mixes.
A dry mix composition for use in making cementitious skim coat mortars comprising from 15 to 33 wt. % of a white cement, from 65 to 83 wt. % of one or more fillers having a sieve average particle size of from 15 to 60 microns and chosen from dolomite, kaolinite, calcium carbonate, talc, silica sand, white silica sand, or alkali metal silicates, from 0.15 to 0.75 wt. % of one or more gel-like crosslinked cellulose ethers containing polyether groups, and from 0.5 to 5 wt. % of one or more polymer redispersible powders (RDP), all amounts being wt. % of total solids in the dry mix composition and all proportions adding up to 100%.
Dependencies are inferred from the claim text.