GYPSUM-CONTAINING BOARD AND TILE, AND METHOD FOR PRODUCING SAME
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Abstract
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.
50 Citations
67 Claims
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1-51. -51. (canceled)
- 52. Gypsum board comprising set gypsum formed from at least calcined gypsum, water and sodium trimetaphosphate, wherein the amount of the sodium trimetaphosphate compound is from about 0.004 to about 2.0% by weight of the calcined gypsum.
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59. A set gypsum-containing machineable product comprising a starch, particles of a water-redispersible polymer, an interlocking matrix of set gypsum, and an enhancing material consisting of sodium trimetaphosphate.
- 60. A set gypsum-containing joint finishing product comprising a binder, a thickener, a non-leveling agent, a calcium sulfate material, water and one or more enhancing materials selected from the group consisting of condensed phosphoric acids, each of which comprises 2 or more phosphoric units, and salts or ions of condensed phosphates, each of which comprises 2 or more phosphate units.
- 63. A composition comprising a mixture of a calcium sulfate material, water, sodium trimetaphosphate and pregelatinized starch, wherein the amount of sodium trimetaphosphate is from about 0.004 to about 2.0% by weight of the calcium sulfate material and the amount of pregelatinized starch is 0.08-0.5 wt. %.
- 66. A composition comprising a mixture of calcium sulfate material, water, an enhancing material consisting of sodium trimetaphosphate, starch and a water-redispersible polymer, wherein the amount of sodium trimetaphosphate is from about 0.004 to about 2.0% by weight of the calcium sulfate material.
Specification