Gypsum-based composite materials reinforced by cellulose ethers
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United States of America Patent
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Jun 7, 2005
Grant Date -
May 13, 2004
app pub date -
May 27, 2003
filing date -
Nov 12, 2002
priority date (Note) -
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Abstract
A gypsum-based composite structure is prepared from a slurry comprising a mixture of calcium sulfate hemihydrate, a cellulose ether additive other than CMC and an amount of water that is sufficient to form a slurry. The calcium sulfate hemihydrate is hydrated by the water forming a wallboard core reinforced by the cellulose ether additive. The concentration, viscosity grade and degree of substitution of the cellulose ether are selected to give the composite improved nail pull resistance and greater flexural strength.
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