Dry wall joint and finishing compounds
AssigneeWeston Research Corporation
InventorWilliam F. Brown
Life of this patent
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Abstract
The dry wall joint compound, which can be used to completely close and fill joints between adjoining panel of gypsum dry wall board without a tape material, comprises a powdered mixture of gypsum, hydrated gypsum, calcium carbonate, plaster of paris, hydrated amorphous silica and talc. The dry wall joint compound can be admixed with water to provide a dry wall joint cement and preferably is admixed with a liquid additive composition comprising an aqueous mixture of zinc oxide, sodium acetate, ammonium alum, and an acrylic resin.
Claims2
A liquid additive composition for admixing with a wall board joint compound to provide a joint cement, said liquid additive composition comprising an aqueous mixture containing about 0.35 to about 8 weight % zinc oxide, about 0.35 to about 1.5 weight % sodium acetate, about 0.35 to about 3 weight % ammonium alum, and about 0.35 to about 8 weight % of an acrylic resin, based on the total weight of the aqueous mixture.
A liquid additive composition according to clam 1 containing about 0.7 weight % zinc oxide, about 0.7 weight % sodium acetate, about 0.7 weight % ammonium alum, and about 0.7 weight % of the acrylic resin.
Dependencies are inferred from the claim text.