METHOD FOR PRODUCING PIGMENT-INCLUDING SILICA PARTICLE, PIGMENT-INCLUDING SILICA PARTICLE, AND COSMETIC INCLUDING THE PARTICLE

METHOD FOR PRODUCING PIGMENT-INCLUDING SILICA PARTICLE, PIGMENT-INCLUDING SILICA PARTICLE, AND COSMETIC INCLUDING THE PARTICLE

PROBLEM TO BE SOLVED: To provide a method for producing pigment-including silica particles, pigment-including silica particles obtained by the method, and a use of the particles.SOLUTION: The method for producing pigment-including silica particles includes the steps of: (a) preparing pigment-includi...

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Bibliographische Detailangaben
Hauptverfasser: ENOMOTO NAOYUKI, HAMAZAKI YUICHI
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
CHEMISTRY
COMPOUNDS THEREOF
DYES
HUMAN NECESSITIES
HYGIENE
INORGANIC CHEMISTRY
MEDICAL OR VETERINARY SCIENCE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
NON-METALLIC ELEMENTS
PAINTS
POLISHES
PREPARATION OF CARBON BLACK
PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES
SPECIFIC USE OF COSMETICS OR SIMILAR TOILETPREPARATIONS
TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
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Beschreibung
Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method for producing pigment-including silica particles, pigment-including silica particles obtained by the method, and a use of the particles.SOLUTION: The method for producing pigment-including silica particles includes the steps of: (a) preparing pigment-including silica particle precursor particles by atomizing a pigment-dispersed alkali silicate aqueous solution into hot air flow followed by drying; (b) immersing the pigment-including silica particle precursor particles in an acid aqueous solution to remove the alkali; and (c) drying and heat-treating the resulting particles. The mole ratio of SiO2/M2O (M represents alkali metal) of the pigment-dispersed alkali silicate aqueous solution is in the range of 1 to 5, SiO2 concentration (CS) is in the range of 1 to 30 wt.%, and the ratio (CD)/(CS) of pigment concentration (CD) to SiO2 concentration (CS) is in the range of 0.005-2.3.