Method of producing gypsum building boards
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United States of America Patent
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Dec 31, 2013
Grant Date -
Feb 10, 2011
app pub date -
May 19, 2010
filing date -
Nov 30, 2007
priority date (Note) -
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Abstract
A method of producing gypsum building board, in which there is added, to an aqueous gypsum slurry containing a water swellable clay, a basic water-soluble polymer having preferential affinity for clay. The slurry is allowed to set so as to form a board. The basic water-soluble polymer may be, for example, a polyvinyl alcohol or a polymer consisting essentially of carbon, nitrogen and hydrogen and having amine groups (which may be primary, secondary, tertiary or quaternary) in the polymer backbone and/or in side chains thereof.
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