Water-resistant gypsum formulations
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United States of America Patent
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Jul 1, 2003
Grant Date -
May 8, 2003
app pub date -
Nov 16, 2001
filing date -
Jul 6, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Emulsions are provided which are useful in imparting water resistance to gypsum products. In one embodiment, the emulsions comprise a plurality of waxes, at least one saponified wax, a complexed starch, a polymerized alkyl phenol, and a small amount of a co-surfactant. In another embodiment, the emulsions comprise a single wax, a balanced dual surfactant system, a complexed starch and a polymerized alkyl phenol. Emulsions of this embodiment may be added to hot, even boiling, water without the emulsion separating or curdling. The emulsions of the present invention are stable for extended periods of time when stored at room temperature and do not require the addition of a bactericide. The emulsions of the present invention are pourable liquids at room temperature.
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