DEFOAMING AGENT
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United States of America Patent
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Nov 19, 2015
filing date -
Nov 22, 2014
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Abstract
There is provided a defoaming agent having excellent defoaming persistence. The defoaming agent includes; hydrophobic silica having a hydrophobicity (MX) of 50 to 85, and a rate of change (MY/MX) of a hydrophobicity (MY) after immersion for 1 hour in a methanol/ion-exchange aqueous solution (volume ratio of 80/20) of sodium hydroxide with a pH of 13 at 25° C. to the hydrophobicity (MX) of 0.8 to 1.0; and at least one kind of liquid selected from the group consisting of a hydrocarbon oil, a non-reactive silicone oil and a polyoxyalkylene compound.
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