| 摘要 |
PURPOSE: To obtain composite particles excellent in economy which are prepared by coating the surfaces of powder particles used as a cosmetic powder directly with boron nitride powder, thus improved in unnatural glaring and finish while the merits of the boron nitride powder, namely spreadability, gloss, adhesion and the like is usefully maintained. CONSTITUTION: The mother particle of cosmetic powder such as nylon, mica, talc or the like is directly coated with boron nitride powder on its surface to give this composite particle. The amount of the coating boron nitride powder is 5-70wt.% based on the mother particle. The average particle size of the mother particle is pref. 1-50μm, and that of the boron nitride powder is 0.005-5μm. Especially, the composite particle of less than 0.5 regular reflectance is preferred. This composite particle is produced by allowing the boron nitride powder to adhere to the surface of organic particle statically, then strengthening the bond between them forcibly with a physical force. Or, a suspension containing an inorganic particle, boron nitride powder and a dispersant is spray- dried and calcined. The composite particles are added to a cosmetic in an amount of 1-80wt.%.
|
