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US 8,343,273 B1Granted
Method of modifying beta stucco using diethylene-triamine-pentaacetic acid
AssigneeUnited States Gypsum Company
InventorsDennis M. Lettkeman, Raymond A. Kaligian, II, Michael L. Cloud, John W. Wilson
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Abstract
A method for preparing a modified beta-stucco from calcined natural rock gypsum that includes preparing a solution of liquid diethylene-triamine-pentaacetic acid in water, applying the solution onto beta-stucco while hot from the calciner, forming a wetted beta-stucco, and allowing the wetted stucco to dry and heal, forming the modified beta-stucco.
Claims11
A method for preparing a modified beta-stucco from calcined natural rock gypsum comprising:
- preparing a solution of liquid diethylene-triamine-pentaacetic acid in water;
- applying the solution onto said beta-stucco while hot from the calciner, forming a wetted stucco;
- and
- allowing the wetted stucco to dry and heal, forming the modified beta-stucco.
1 more element
Dependencies are inferred from the claim text.