Invention Application
US20100291305A1 DECREASED EVAPORATION WITH RETARDER FOR A HIGH WATER TO STUCCO RADIO LIGHTWEIGHT BOARD
审中-公开
降低对STUCCO无线电轻便板的高耗水量的延迟
- Patent Title: DECREASED EVAPORATION WITH RETARDER FOR A HIGH WATER TO STUCCO RADIO LIGHTWEIGHT BOARD
- Patent Title (中): 降低对STUCCO无线电轻便板的高耗水量的延迟
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Application No.: US12681681Application Date: 2008-12-23
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Publication No.: US20100291305A1Publication Date: 2010-11-18
- Inventor: James R. Wittbold , Bruce Lynn Petersen , Alfred Li
- Applicant: James R. Wittbold , Bruce Lynn Petersen , Alfred Li
- Applicant Address: US IL Chicago
- Assignee: United States Gypsum Company
- Current Assignee: United States Gypsum Company
- Current Assignee Address: US IL Chicago
- International Application: PCT/US08/88185 WO 20081223
- Main IPC: C04B28/14
- IPC: C04B28/14 ; C04B24/16 ; B05D3/02
Abstract:
A gypsum slurry includes calcium sulfate hemihydrate, a set retarder in amounts of at least 0.15 lb/MSF, a set accelerator, water and aqueous foam. The set accelerator is selected to provide nucleation sites for crystallization of calcium sulfate dihydrate and is present in amounts of at least 5 Ib/MSF. The water to calcium sulfate hemihydrate ratio is at least 0.95. Further, aqueous foam is added in amounts sufficient to create a gypsum board having a dry density of about 29 to about 35 lbs/ft3.
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