Defoaming agent
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United States of America Patent
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May 24, 2016
Grant Date -
Apr 10, 2014
app pub date -
Jun 3, 2011
filing date -
Jun 3, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides a defoaming agent containing, as essential components, hydrophobic dry silica (S) prepared by hydrophobizing silica prepared using a dry process and having a primary particle diameter of 5 to 100 nm, water, and a hydrophobic liquid (Q) containing 1 to 25% by weight of an ester compound (E) represented by the following formula, (R1—COO)p-D, wherein R1 denotes an alkyl group or an alkenyl group; D denotes a residue resulting from the removal of a hydroxyl group contributing to an ester linkage from a compound (D′) containing 2 to 6 carbon atoms and 1 to 6 hydroxyl groups or a residue resulting from the removal of a hydroxyl group contributing to an ester linkage from an adduct prepared by adding an alkylene oxide to the compound (D′); and p denotes an integer from 1 to 3.
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