| 摘要 |
Use of a polymer comprising a main chain containing hydrocarbon group, at least a side chain comprising at least an acid group from carboxylic acid group, sulfonic acid group, phosphonic acid group, phosphoric acid group or its salt, at least a side chain with a molecular weight of at least 1800 g/mole and comprising a polyoxyalkylene group, as dispersing agent for gypsum compositions, is claimed, where the polyoxyalkylene group is bonded to the main chain over a coupler comprising at least an ester, amide or imide group. Use of a polymer comprising a main chain containing hydrocarbon group, at least a side chain comprising at least an acid group from carboxylic acid group, sulfonic acid group, phosphonic acid group, phosphoric acid group or its salt, at least a side chain with a molecular weight of at least 1800 g/mole and comprising a polyoxyalkylene group, as dispersing agent for gypsum compositions, is claimed, where the polyoxyalkylene group is bonded to the main chain over a coupler comprising at least an ester, amide or imide group, and the polymer has acid content of 1.5-4, preferably 1.7-3.5 mmole per 1 g of the polymer. Independent claims are included for: (1) a binder comprising a mixture of at least 30 wt.% of gypsum and at least a polymer; and (2) the preparation of the binder containing the mixture comprising separating the polymer or adding a binder, as additive, in solid or liquid form. |
