Polymeric oxyalkylate viscosity modifiers for use in gypsum wallboard production
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United States of America Patent
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Mar 30, 1999
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N/A
app pub date -
Jul 14, 1997
filing date -
Jul 14, 1997
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Expired
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Abstract
Methods for making gypsum wallboard and for enhancing the compressive strength of wallboard by the addition of polymeric oxyalkylate viscosity modifiers are described. Preferred compounds are a copolymer comprising blocks of ethylene oxide and propylene oxide ether-linked to (1,2 ethandiyl dintrilo) tetrakis (propanol), an ethylene oxide/propylene oxide block copolymer and a polyethylene glycol polymer cross-linked with bisphenol A diglycidyl ether and combinations thereof.
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