Loading patent…
AssigneeDow Global Technologies LLC
InventorsAlexandra Hild, Joerg Neubauer, Joern Breckwoldt
Estimating the term…
The present invention provides cementitious tile adhesives comprising ordinary Portland cement, sand or another inorganic filler, and from 0.12 to 0.6 wt. % of total solids of one or more polyether group containing crosslinked cellulose ethers. The present invention also provides methods of making the polyether group containing crosslinked cellulose ethers comprising crosslinking a cellulose ether at 90° C. or less, in an inert atmosphere, e.g. nitrogen, in the presence of a polyether group containing crosslinking agent and in the presence of alkali; the process may comprise part of a stepwise addition process of making of a cellulose ether itself in which the crosslinking of the cellulose ethers precedes at least one addition of alkyl halide or alkylene oxide to form, respectively, alkyl or hydroxyalkyl groups on the cellulose.
A dry mix composition for use in making cementitious tile adhesives or mortars comprising from 20 to 35 wt. % of ordinary portland cement, from 64.7 to 79.9 wt. % of sand or an inorganic filler, and one or more crosslinked cellulose ethers containing polyether groups in the amount of from 0.12 to 0.6 wt. % of total solids.
A method of making polyether group containing crosslinked cellulose ethers comprising crosslinking at 90° C. or less, in an inert atmosphere, a cellulose ether in the presence of a polyether group containing crosslinking agent in an amount of from 0.0001 to 0.05 eq to form a crosslinked polyether group containing cellulose ether, wherein the unit “eq” represents the molar ratio of moles of the respective crosslinking agent relative to the number of moles of anhydroglucose units (AGU) in the cellulose ether;
Dependencies are inferred from the claim text.