Method for retarding plaster setting and plaster preparation
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United States of America Patent
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Nov 25, 2008
Grant Date -
Jul 26, 2007
app pub date -
Aug 12, 2005
filing date -
Aug 24, 2004
priority date (Note) -
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Abstract
A method for retarding plaster setting and plaster preparations, relies upon a composition including a. tartaric acid in an amount of at least 0.01 to 1.0 weight % (based on plaster amount); b. sodium trimetaphosphate in an amount of 0.05 to 0.5 weight %, (plaster amount basis); and optionally c. sodium polyphosphate with an average chain length of at least 4 to 50 phosphate units.
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