Abstract: A water-in-oil emulsion composition includes: an external oil phase, in which a first hydrophobic powder is dispersed; and an internal aqueous phase, in which a second hydrophobic powder is dispersed, in which, among the first hydrophobic powder and the second hydrophobic powder, at least the second hydrophobic powder is a metal oxide treated with trimethylethoxysilane, in which the water-in-oil emulsion composition further includes a dispersant that disperses the second hydrophobic powder in the internal aqueous phase, and in which the dispersant is at least one of a silicone-based surfactant and a cationic surfactant.

Abstract: A method of emulsification of an oil phase in an aqueous continuous phase, by dispersing core-corona microparticles into the aqueous phase, adding the oil phase, and applying shearing force for a time sufficient to emulsify the resulting mixture. The core-corona microparticles are obtained by radical co-polymerization of a polyethylene oxide macromonomer with at least one hydrophobic acrylate monomer and at least one hydrophobic acrylamide monomer.

Abstract: A water-in-oil emulsion composition that is significantly excellent in emulsification stability, and also excellent in non-stickiness is provided. The water-in-oil emulsion composition includes (a) a polyoxyalkylene/alkyl co-modified silicone; (b) a core-corona particle; (c) an oil-phase component; and (d) an aqueous-phase component.

Abstract: An objective of the present invention is to provide a powder dispersion composition provided with high powder dispersibility, and a cosmetic having excellent properties in use and good stability over time due to using the powder dispersion composition. The powder dispersion composition according to the present invention contains (A) a powder, (B) an oil component, and (C) polyglyceryl polyricinoleate, wherein the (B) oil component contains (b1) a polar oil and (b2) a volatile oil; the (b1)) polar oil constitutes 35% to 80% by mass of the overall amount of the (B) oil component; the (b2) volatile oil is 20% by mass or more volatile hydrocarbon oil; and the (C) polyglyceryl polyricinoleate constitutes 0.5% to 10% by mass relative to the overall amount of the powder dispersion composition.

Abstract: The purpose of the present invention is to provide a water-in-oil type emulsion cosmetic that has a replenishing and smooth feel-of-use, that, once applied, forms a uniform coating, and that can minimize the appearance of skin roughness such as pores while covering discoloration such as spots and freckles, but that does not give an impression of a thick coating. The present invention provides a water-in-oil type emulsion cosmetic characterized by containing (A) 0.1-20 mass % of metallic soap-treated powder, and (B) a water-absorptive polymer having 0.01-2 mass % of a carboxyl group. The (B) water-absorptive polymer having a carboxyl group of this cosmetic preferably can absorb 10-1,000 times its own weight.

Abstract: Provided are: a core-corona polymer particle excellent in emulsion stability and feeling of use, and a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising the particle. Certain embodiments of the present invention provides a core-corona polymer particle obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Abstract: Provided are: a core-corona polymer particle excellent in emulsion stability and feeling of use, and a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising the particle. The present invention provides a core-corona polymer particle obtained by radical-polymerizing a polyethylene oxide macromonomer represented by the formula (1) and one or two or more of hydrophobic monomers represented by the formulas (2) and (3) under the following conditions (A) to (D).

Abstract: Provided are a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising a core-corona polymer particle excellent in emulsion stability and feeling of use. Certain embodiments of the present invention provides a raw material for a cosmetic, comprising a core-corona polymer particle dispersion obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Abstract: A transparent liquid composition that does not substantially contain ethyl alcohol, contains water as the main solvent, and has a high concentration of perfume is provided. The transparent liquid composition comprises: (a) 3-20% by mass of a perfume component; (b) a hydrogenated castor oil to which 30-60 moles of polyoxyethylene is added; (c) an alkanol obtained by addition polymerization of 20-30 moles of polyoxyprolylene and 20-30 moles of polyoxyethylene; (d) one type or more of a surfactant having an Inorganic-value/Organic-value of 0.70-1.20; and (e) 40% by mass or greater of an aqueous component other than ethyl alcohol, wherein the blending ratio (d/(b+c)) of the component (d) to the sum of the blending amounts of the components (b) and (c) is 0.03-0.60, and ethyl alcohol is not substantially contained.

Abstract: A water-in-oil emulsion composition that is significantly excellent in emulsification stability, and also excellent in non-stickiness is provided. The water-in-oil emulsion composition includes (a) a polyoxyalkylene/alkyl co-modified silicone; (b) a core-corona particle; (c) an oil-phase component; and (d) an aqueous-phase component.

Abstract: A method of emulsification of an oil phase in an aqueous continuous phase, by dispersing core-corona microparticles into the aqueous phase, adding the oil phase, and applying shearing force for a time sufficient to emulsify the resulting mixture. The core-corona microparticles are obtained by radical co-polymerization of a polyethylene oxide macromonomer with at least one hydrophobic acrylate monomer and at least one hydrophobic acrylamide monomer.

Abstract: The purpose of the present invention is to provide a water-in-oil type emulsion cosmetic that has a replenishing and smooth feel-of-use, that, once applied, forms a uniform coating, and that can minimize the appearance of skin roughness such as pores while covering discoloration such as spots and freckles, but that does not give an impression of a thick coating. The present invention provides a water-in-oil type emulsion cosmetic characterized by containing (A) 0.1-20 mass % of metallic soap-treated powder, and (B) a water-absorptive polymer having 0.01-2 mass % of a carboxyl group. The (B) water-absorptive polymer having a carboxyl group of this cosmetic preferably can absorct 10-1,000 times its own weight.

Abstract: Provided are: a core-corona polymer particle excellent in emulsion stability and feeling of use, and a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising the particle. Certain embodiments of the present invention provide a core-corona polymer particle obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Abstract: Provided are: a core-corona polymer particle excellent in emulsion stability and feeling of use, and a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising the particle. Certain embodiments of the present invention provides a raw material for a cosmetic comprising a core-corona polymer particle obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Abstract: Provided are a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising a core-corona polymer particle excellent in emulsion stability and feeling of use. Certain embodiments of the present invention provides a raw material for a cosmetic, comprising a core-corona polymer particle dispersion obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Abstract: Provided are: a core-corona polymer particle excellent in emulsion stability and feeling of use, and a raw material for a cosmetic and an oil-in-water emulsion cosmetic comprising the particle. Certain embodiments of the present invention provides a core-corona polymer particle obtained by radical-polymerizing a polyethylene oxide macromonomer represented by formula (1) and one or two or more of hydrophobic monomers represented by formulas (2) and (3) under conditions (A) to (D).

Abstract: An emulsifier is comprised of core-corona type microparticles that an emulsification capability thereof is not affected by the crosslinking level and an oil-in-water emulsified cosmetic emulsified by the afore-mentioned emulsifier.