Plaster composition containing water-reducing agent
AssigneeUnited States Gypsum Company
InventorsRobert G. Lange, Harley L. Schlotthauer
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Abstract
A plaster composition containing an agent for reducing the amount of water necessary in forming a pourable aqueous calcined gypsum slurry, the agent comprising a high potassium salt of a condensation product of naphthalene and sulfonic acid having a molecular weight between about 300 and 3,000. Aqueous plaster slurries containing the agent are pourable, moldable and castable with much less excess water than ordinarily required, resulting in dried cast products of increased strength and other physical property benefits.
Claims13
A plaster composition consisting essentially of calcined gypsum and a minor amount of a water-reducing agent for the calcined gypsum, the water-reducing agent comprising a potassium salt of naphthalene sulfonic acid condensate having a molecular weight between about 300 and 3,000, said condensate containing from about 0.10% to about 30% by weight of potassium expressed as potassium oxide.
A method of reducing the amount of water required to be mixed with a dry plaster composition to obtain a pourable slurry which comprises adding to a calcined gypsum plaster composition from about 1/2 pound to about 30 pounds per ton of napthalene sulfonic acid condensate having a molecular weight from about 300 to about 3,000 and containing by weight of the condensate from about 10% to about 30% of potassium expressed as potassium oxide.
Dependencies are inferred from the claim text.