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US 6,902,821 B2Granted
Methods of preparing gypsum wallboards containing styrene butadiene latex additive
AssigneeNational Gypsum Properties, LLC
InventorsGopalakrishnan Sethuraman, W. Roy Burke, Amba Ayambem, Richard J. Romanek
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Abstract
Gypsum wallboard compositions are disclosed which contain functionalized styrene butadiene latex polymers. Methods for the use of the compositions in the manufacture of wallboard panels and sheets is presented.
Claims8
A method of making a gypsum wallboard, the method comprising:
- forming a slurry comprising calcium sulfate hemihydrate, water, and a functionalized styrene butadiene latex polymer;
- crosslinked by dimethacrylate having from 2 to 30 ethoxy units between methacrylate functionalities mixing the slurry;
- depositing the slurry onto a first cover sheet;
- and
- applying a second cover sheet atop the deposited slurry.
2 more elements
Dependencies are inferred from the claim text.