abstract |
An aqueous slurry of a by-produced gypsum, having a pH of 5 to 10, contains as plasticizer a copolymer prepared by polymerizing a polyalkylene glycol monoester monomer (a) containing 2 to 300 C 2 -C 3 oxyalkylene molecules with at least one monomer (b) selected from among unsaturated monocarboxylic acids, unsaturated dicarboxylic acids and allylsulfonic acids. |