There is provided a novel production method of a powder cosmetic containing a UV wavelength conversion substance including a slurry step, and a powder cosmetic produced by this method.

There is provided a novel composition containing a UV wavelength conversion substance and a powder of a hydrophobized silica and/or a hydrophobized starch.

[Problem] To provide a novel cell activator.

[Solution] Provided are: a cell activator comprising a wavelength conversion substance as an active ingredient; a composition and a product comprising the cell activator; and a method for activating skin using thereof. The present invention can exhibit a desirable effect on skin by effectively making use of ultraviolet light to activate skin cells.

Provided is a novel cosmetic containing: an ultraviolet wavelength conversion substance and a drug.

The invention relates to a talc-free powdery solid cosmetic containing a powder component and an oil-based component that is [1] a powdery solid cosmetic which contains mica (A) having an average particle size of 15 μm or less and mica (B) having an average particle size of 10 μm or more as the powder component and in which the difference between the average particle size of the mica (A) and the average particle size of the mica (B) is 5 μm or more or [2] a powdery solid cosmetic containing 30 mass % or more of mica produced by a wet forming method.

Provided is an inorganic powder composite used for a water-in-oil type fine dispersion system which is excellent in emulsification and emulsification stability. The inorganic powder composite includes: an inorganic powder; and a first hydrophobic treatment agent, a second hydrophobic treatment agent, and a hydrophilic treatment agent, which cover at least one part of a surface of the inorganic powder, the first hydrophobic treatment agent is a silicon compound, the second hydrophobic treatment agent is a fatty acid, and the hydrophilic treatment agent is hydrous silica.

The invention provides an inorganic particle dispersion comprising a novel block copolymer capable of improving dispersibility of inorganic particles, particularly an inorganic particle dispersion for a cosmetic.

The inorganic particle dispersion, particularly the inorganic particle dispersion for a cosmetic of the present invention comprises a dispersion medium, an inorganic particle dispersed in the dispersion medium, and a block copolymer comprising a hydrophobic segment and a hydrophilic segment, wherein the hydrophobic segment comprises a monomer unit composed of at least one monomer selected from the following Formula 1 and Formula 2, wherein at least a portion of the hydrophilic segment is adsorbed on the inorganic particle, and the hydrophobic segment is oriented outwardly relative to the inorganic particle:

##STR00001## where R.sup.1 is hydrogen or a methyl group, R.sup.2 is hydrogen or fluorine, m is an integer of 0 to 6, and n is an integer of 1 to 15,

##STR00002## where R.sup.1 is hydrogen or a methyl group, R.sup.3 and R.sup.4 are each independently an alkyl group having 1 to 6 carbon atoms, m is an integer of 1 to 6, and p is an integer of 5 to 70.

The present invention relates to a composite particle comprising: at least one hydrophilic core particle; and a plurality of hydrophobic particles, wherein the surface of the hydrophilic core particle is substantially discontinuously covered by the hydrophobic particles. The novel composite particle according to the present invention can have surface active properties sufficient to prepare stable Pickering emulsions, and can maintain the surface active properties over a long period of time. The present invention also relates to a method for preparing the above composite particle.

Silica-including microcapsule resin particles including an outer shell constituted of a crosslinked polymer and a cavity partitioned with the outer shell, in which the silica-including microcapsule resin particles contain inside the cavity a porous structure in which silica particles are mutually connected, and have a volume average particle diameter of 0.5 to 100 μm.

The invention relates to a dispersion of polymer particles stabilized with a stabilizer in a nonaqueous medium containing at least one hydrocarbon-based oil, the polymer of the particles being a C.sub.1-C.sub.4 alkyl (meth)acrylate polymer; the stabilizer being a C.sub.1-C.sub.4 alkyl (meth)acrylate polymer and optionally of a silicone macromonomer (I): the stabilizer being a polymer comprising from 50% to 100% by weight, relative to the total weight of the stabilizer, of C.sub.8-C.sub.22 alkyl acrylate, from 0 to 50% by weight of C.sub.1-C.sub.4 alkyl (meth)acrylate and optionally silicone macromonomer (I). The invention also relates to the composition comprising said dispersion of polymer particles. Cosmetic use for caring for and making up keratin materials.