Powdery silica composite particles and process for producing the same, silica composite particle dispersion, and resin composition
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United States of America Patent
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Feb 14, 2012
Grant Date -
Aug 13, 2009
app pub date -
Feb 6, 2009
filing date -
Feb 8, 2008
priority date (Note) -
Expired
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Abstract
Powdery silica composite particles obtained by a surface treatment step of adding acid or alkali to a reactant solution comprising: core silica particles of 5 to 200 nm in average particle size; alkoxysilane; a phosphonium salt ionic liquid represented by general formula (1);represents a linear or branched alkyl group having 1 to 5 carbon atoms, n represents an integer of 1 to 8, and X represents an anionic group; and a reaction solvent such that the alkoxysilane is hydrolyzed, thereby surface-treating the core silica particles.
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