The present invention provides a powder surface treatment method comprising (i) a step for mixing 0.001-20 parts by mass of a surface treating agent composition with 100 parts by mass of a power, and (ii) a step for adding an acidic liquid, followed by mixing, wherein the surface treating agent composition contains (a)-(d) below: (a) one or more selected from among an N-acyl amino acid having a carbon chain length of C8-C22 and a salt thereof; (b) one or more selected from among monohydric and polyhydric alcohols; (c) water; and (d) one or more selected from among (dl) an amino acid having an isoelectric point of 7.5-11, and (d2) a compound which generates an ion selected from among an aluminum ion, a magnesium ion, a calcium ion, a zinc ion, a zirconia ion, and a titanium ion, in the surface treating agent composition.

The present invention provides a powder surface treatment method comprising (i) a step for mixing 0.001-20 parts by mass of a surface treating agent composition with 100 parts by mass of a power, and (ii) a step for adding an acidic liquid, followed by mixing, wherein the surface treating agent composition contains (a)-(d) below: (a) one or more selected from among an N-acyl amino acid having a carbon chain length of C8-C22 and a salt thereof; (b) one or more selected from among monohydric and polyhydric alcohols; (c) water; and (d) one or more selected from among (dl) an amino acid having an isoelectric point of 7.5-11, and (d2) a compound which generates an ion selected from among an aluminum ion, a magnesium ion, a calcium ion, a zinc ion, a zirconia ion, and a titanium ion, in the surface treating agent composition.

The present invention relates to a method of producing a composite powder. A porous powder is physically covered by collagen and chitosan sequentially, thereby forming the composite powder. The composite powder has good dispersity, an ability of moisture retention and a low greasiness while being added in an oil-in-water emulsion base or a hydrogel base to form a cosmetic composition.

The present invention relates to a process for making up the skin, including the step that consists in forming, on a deposit of a foundation composition applied to the skin, a discontinuous deposit of islets of corrective composition and/or a deposit of corrective composition including visible substances that give it an inhomogeneous appearance, said corrective composition having optical properties that locally modify the appearance of the makeup so as to create a pattern reproducing the appearance of skin relief and/or colour heterogeneities.

The present invention relates to a process for making up the skin, including the step that consists in forming, on a deposit of a foundation composition applied to the skin, a discontinuous deposit of islets of corrective composition and/or a deposit of corrective composition including visible substances that give it an inhomogeneous appearance, said corrective composition having optical properties that locally modify the appearance of the makeup so as to create a pattern reproducing the appearance of skin relief and/or colour heterogeneities.

An inverse emulsion copolymer composition comprises (A) an aqueous phase comprising a cross-linked hydrophilic polyelectrolyte copolymer (A′) obtained by the free radical copolymerisation of: (i) at least one anionic ethylenically unsaturated monomer bearing a negatively charged group and one polymerisable C═C double bond, or at least one cationic ethylenically unsaturated monomer bearing a positively charged group and one polymerisable C═C double bond, and (ii) at least one non-ionic ethylenically unsaturated cross-linking monomer bearing at least two polymerisable C═C double bonds, and (iii) optionally, one or more hydrophilic non-ionic ethylenically unsaturated monomers bearing one polymerisable C═C double bond, (B) an oil phase comprising a carrier oil (C), (D) (i) at least one water-in-oil emulsifying surfactant, and (D) (ii) at least one oil-in-water emulsifying surfactant; characterised in that the carrier oil component (C) of the oil phase comprises from 75% to 100%, by weight of the said carrier oil component (C), of farnesane (2, 6, 10-trimethyldodecane). The compositions are effective for use as thickeners for thickening aqueous solutions, including solutions which contain dissolved salts. The compositions also show excellent thickening in acidic solutions than counterpart compositions containing paraffinic oils.

An inverse emulsion copolymer composition comprises (A) an aqueous phase comprising a cross-linked hydrophilic polyelectrolyte copolymer (A′) obtained by the free radical copolymerisation of: (i) at least one anionic ethylenically unsaturated monomer bearing a negatively charged group and one polymerisable C═C double bond, or at least one cationic ethylenically unsaturated monomer bearing a positively charged group and one polymerisable C═C double bond, and (ii) at least one non-ionic ethylenically unsaturated cross-linking monomer bearing at least two polymerisable C═C double bonds, and (iii) optionally, one or more hydrophilic non-ionic ethylenically unsaturated monomers bearing one polymerisable C═C double bond, (B) an oil phase comprising a carrier oil (C), (D) (i) at least one water-in-oil emulsifying surfactant, and (D) (ii) at least one oil-in-water emulsifying surfactant; characterised in that the carrier oil component (C) of the oil phase comprises from 75% to 100%, by weight of the said carrier oil component (C), of farnesane (2, 6, 10-trimethyldodecane). The compositions are effective for use as thickeners for thickening aqueous solutions, including solutions which contain dissolved salts. The compositions also show excellent thickening in acidic solutions than counterpart compositions containing paraffinic oils.

The purpose of the present invention is to provide a stick cosmetic that has a stick shape and a novel function that allows said stick cosmetic to be used to replenish moisture throughout the day. The present invention relates to a stick cosmetic for moisture replenishment, said stick cosmetic comprising: (A) 0.01-50 mass % of a fluid volatile oil component; (B) 10 mass % or more of water; (C) a wax that is capable of gelating the fluid volatile oil component; (D) a silicone elastomer; and (E) a silicone-based surfactant. The cosmetic of the present invention preferably further comprises (F) a moisturizing agent. The cosmetic of the present invention is suitable for use in touching up makeup and has a stick shape that exhibits excellent portability.

The present invention provides a composition that has an excellent hardness adjustment action, can be used as a solidifying agent for various cosmetics, and when added to cosmetics, can impart those cosmetics with excellent shape retention properties, an oil oozing suppression effect during use, a favorable texture and good storage stability, and also provides an oily solid cosmetic to which the composition has been added. Specifically, the invention provides a solid wax composition containing a component (A): candelilla wax, and a component (B): a monoester having a total of 40 to 48 carbon atoms, wherein the mass ratio between the component (A) and the component (B) in the solid wax composition satisfies component (A):component (B)=45:55 to 95:5, and the monoester is a monoester of a monovalent fatty acid and a monohydric alcohol.

The present invention provides a composition that has an excellent hardness adjustment action, can be used as a solidifying agent for various cosmetics, and when added to cosmetics, can impart those cosmetics with excellent shape retention properties, an oil oozing suppression effect during use, a favorable texture and good storage stability, and also provides an oily solid cosmetic to which the composition has been added. Specifically, the invention provides a solid wax composition containing a component (A): candelilla wax, and a component (B): a monoester having a total of 40 to 48 carbon atoms, wherein the mass ratio between the component (A) and the component (B) in the solid wax composition satisfies component (A):component (B)=45:55 to 95:5, and the monoester is a monoester of a monovalent fatty acid and a monohydric alcohol.