| US 7,572,328 B2 | ||
| Fast drying gypsum products | ||
| Dennis M. Lettkeman, Watonga, Okla. (US); Qingxia Liu, Vernon Hills, Ill. (US); John W. Wilson, Fairview, Okla. (US); Brian S. Randall, Fairview, Okla. (US); David R. Blackburn, Barrington, Ill. (US); and Michael P. Shake, Johnsburg, Ill. (US) | ||
| Assigned to United States Gypsum Company, Chicago, Ill. (US) | ||
| Filed on Jun. 14, 2005, as Appl. No. 11/152,661. | ||
| Prior Publication US 2006/0281837 A1, Dec. 14, 2006 | ||
| Int. Cl. C04B 11/00 (2006.01) | ||
| U.S. Cl. 106—772 [106/778; 106/823; 524/5] | 9 Claims |
| 1. A gypsum slurry comprising:
water;
a hydraulic material comprising at least 50% calcium sulfate hemihydrate; and
a polycarboxylate dispersant co-polymer having a molecular weight in the range of 20,000 to 80,000 Daltons, comprising a vinyl
ether repeating unit, an acrylic acid repeating unit and a maleic acid repeating unit.
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