Process for preparing water-repellent articles from gypsum powder containing hydrophobic agents
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United States of America Patent
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-
Jul 25, 1989
Grant Date -
N/A
app pub date -
Jan 11, 1988
filing date -
Feb 12, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to gypsum powders containing a hydrophobic agent and to water-repellent articles which are prepared from gypsum containing powered hydrophobic agents, in which the hydropohobic agents are prepared by spray-drying a mixture containing at least water, an organopolysiloxane having Si-bonded hydrogen and a water-soluble, film-forming polymer having a turbidity point of from 35.degree. to 98.degree. C.
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