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US 6,409,825 B1Granted
Wet gypsum accelerator and methods, composition, and product relating thereto
AssigneeUnited States Gypsum Company
InventorsQiang Yu, Srinivas Veeramasuneni
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Abstract
A wet gypsum accelerator comprising particles of calcium sulfate dihydrate, water, and at least one additive selected from the group consisting of (i) an organic phosphonic compound, (ii) a phosphate-containing compound, or (iii) a mixture of (i) and (ii), is disclosed. Also disclosed are a method of preparing a wet gypsum accelerator, a method of hydrating calcined gypsum to form an interlocking matrix of set gypsum, a set gypsum-containing composition, and a set gypsum-containing product.
Claims11
A method of hydrating calcined gypsum to form an interlocking matrix of set gypsum comprising:
- forming a mixture of calcined gypsum, water, and a wet gypsum accelerator, said wet gypsum accelerator comprising particles of calcium sulfate dihydrate, water, and at least one additive selected from the group consisting of:
- (i) an organic phosphonic compound;
- (ii) a phosphate-containing compound;
- and
- (iii) a mixture of (i) and (ii).
2 more elements
Dependencies are inferred from the claim text.