HYDROPHOBIC FINE WET SILICA, METHOD FOR PRODUCING SAME, AND ANTIFOAMING AGENT
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United States of America Patent
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Jan 15, 2015
filing date -
Jan 31, 2014
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Abstract
There is provided hydrophobic silica that will cause no deterioration in the gloss of resin or of a coating film even when having been applied as a wear resistance-improver or a mechanical strength enhancer for resin or as a fluidizing agent for powder paint or the like and that will cause no deterioration in the gloss of a resulting coating film even when having been applied to a defoaming agent. There is provided hydrophobic particulate wet process silica resulting from subjecting hydrophilic wet process silica to hydrophobization treatment and milling treatment. The number-average particle diameter (Dn) is 0.1 to 1 μm and the M value is 50 to 80. The milling treatment is preferably wet milling treatment. The hydrophobization treatment is preferably wet hydrophobization treatment. The ratio of the volume-average particle diameter (Dv) to the number-average particle diameter (Dn) (Dv/Dn) is preferably 1 to 4.
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