METHOD OF STARCH REDUCTION IN WALLBOARD MANUFACTURING AND PRODUCTS MADE THEREFROM
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United States of America Patent
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Issued Date -
Feb 26, 2009
app pub date -
Aug 22, 2008
filing date -
Aug 22, 2007
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Abstract
A gypsum composition for use as a wallboard core contains stucco, water, a styrene acrylic or acrylic hybrid copolymer, and a reduced amount of starch. A finished wallboard using this composition has similar properties, including compressive strength and paper core bond strength of a finished board, to wallboards made from compositions having higher quantities of starch. A method for producing such a composition is shown, the method requiring mixing of stucco and pulp water in a pin mixer, with the addition of starch and the styrene acrylic or acrylic hybrid copolymer.
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