| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a gypsum composition including an improved resistance to a permanent deformation. <P>SOLUTION: The composition containing a solid gypsum includes at least a calcined gypsum, water, and an improver. The improver is selected from: (i) an organic polyphosphonic compound or a mixture thereof; (ii) a borate selected from a ulexite or a colemanite, or a compound thereof; or a mixture of (i) and (ii). The composition containing the solid gypsum is treated by the improver selected from (i) an organic phosphonic compound or a mixture thereof; (ii) the borate selected from the ulexite or the colemanite, or the compound thereof; (iii) a carboxyl compound or a mixture thereof; or a mixture of (i) and (ii)/or (iii). <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
