Method for forming a lightweight cementitious structural product and product formed thereby
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United States of America Patent
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May 21, 1985
Grant Date -
N/A
app pub date -
Jul 15, 1983
filing date -
Jul 15, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for producing a lightweight set cementitious product, and more specifically, gypsum wallboard, having excellent strength and paper-to-core bond, which method comprises producing a foam comprising polyvinyl alcohol and water, introducing the foam thus formed into an aqueous cementitious slurry, depositing the slurry between paper cover sheets, and permitting the cementitious slurry to set. In a further embodiment an emulsion formed of asphalt and wax is added to the cementitious slurry to impart water resistance, the polyvinyl alcohol of the foaming agent cooperating with the asphalt and wax emulsion to improve the water resistant properties of the set gypsum wallboard.
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