METHOD FOR PRODUCING HOLLOW SILICA PARTICLES

To provide hollow silica particles having a dense silica shell layer.A method for producing hollow silica particles, which comprises:adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in...

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Bibliographische Detailangaben
Hauptverfasser:	KAMIYA, Hiroyuki, KIM, Hyunji, MATSUBARA, Toshiya
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	To provide hollow silica particles having a dense silica shell layer.A method for producing hollow silica particles, which comprises:adjusting the pH of an oil-in-water emulsion containing an aqueous phase, an oil phase and a surfactant to at most 3.0 and adding a first silica material to the oil-in-water emulsion,adding a second silica material to the emulsion having the first silica material added, at its pH of at least 8, in the presence of alkali metal ions, to obtain a hollow silica precursor dispersion, andobtaining a hollow silica precursor from the hollow silica precursor dispersion and obtaining hollow silica particles from the hollow silica precursor,wherein the second silica material is added to the heated emulsion, wherein the heating temperature is from 30 to 100°C.