Foamed slurry and building panel made therefrom
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United States of America Patent
Stats
-
Jan 25, 2011
Grant Date -
Jan 10, 2008
app pub date -
Aug 17, 2007
filing date -
Jun 14, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A gypsum slurry is described that includes water, a hydraulic component comprising at least 50% calcined gypsum by weight based on the dry weight of the hydraulic component, foam, a defoamer, a polycarboxylate dispersant having olefinic unsaturated mono-carboxylic acid moieties and (poly)oxyalkylene moieties, a first portion of a retarder and a second portion of a retarder. In some embodiments of the invention, the defoamer is combined with the dispersant prior to being added to the gypsum slurry. The defoamer and dispersant can be added as a physical mixture, wherein the defoamer is attached onto the dispersant polymer, or a combination thereof. In some embodiments, a gypsum building panel is made from the gypsum slurry.
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Cited Art Landscape
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