Gypsum-containing product

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, and an appropriate amount of one or more enhancing materials chosen from 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.

主权项

1. A set gypsum-containing product having been prepared by a method comprising:
inserting into a joint between edges of gypsum boards a mixture comprising (a) at least one of (i) binder or (ii) thickener, (b) calcium sulfate material, (c) water, and (d) one or more enhancing materials selected 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, and maintaining the mixture under conditions sufficient for the calcium sulfate material to form a set gypsum material, the enhancing material or materials having been included in the mixture in an amount such that the set gypsum formed has greater resistance to permanent deformation than it would have if the enhancing material had not been included in the mixture.