Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1997-01-07
1999-03-09
Evans, Elizabeth
Stock material or miscellaneous articles
Composite
Of inorganic material
106778, 106802, B32B 1300
Patent
active
058798250
ABSTRACT:
A method of preparation and use of high-strength gypsum wallboard, as well as a core composition suitable for use therein, are disclosed. The core composition includes a slurry of calcium sulfate hemihydrate (stucco), water, and a strengthening agent. The strengthening agent includes an acrylic polymer composition having a glass transition temperature of about 15.degree. C. or greater, and preferably has good divalent ion stability. The method provides wallboard having increased core strength, paper-to-core bonding, and strength-to-weight ratio.
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Burke W. Roy
Kingston Larry W.
Evans Elizabeth
National Gypsum Company
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