Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it

摘要

The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, a pregelatinized starch, an accelerator and one or more enhancing materials chosen from the group consisting of condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.