Oil-in-water emulsion cosmetics

Abstract

To provide an oil-in-water emulsion cosmetic that has high water resistance, emulsion stability, and sunscreen effect, and is less sticky when applied to the skin. [Solution] An oil-in-water emulsion cosmetic comprising component (A): an acrylamide polymer, component (B): hydrophobized fine particle metal oxide, component (C): an oil that is liquid at 25°C and contains ester oil (C1), and component (D): an organic ultraviolet absorber that is solid at 25°C, and not containing an organic ultraviolet absorber that is liquid at 25°C, wherein the content of ester oil (C1) in component (C) is 50% by mass or more, the content of component (D) in the cosmetic is 0.5% by mass or more and 15% by mass or less, and the content of surfactant in the cosmetic is 0.2% by mass or less.

Claims

1. Ingredient (A): Acrylamide polymer, Component (B): Hydrophobized fine particle metal oxide, Ingredient (C): An oil that is liquid at 25°C, containing ester oil (C1), and Ingredient (D): Organic UV absorber that is solid at 25°C. A water-oil-in-water emulsion cosmetic that contains an ultraviolet absorber and is liquid at 25°C, The content of the ester oil (C1) in the component (C) is 50% by mass or more. The content of component (D) in the cosmetic composition is 0.5% by mass or more and 15% by mass or less. An oil-in-water emulsion cosmetic having a surfactant content of 0.2% by mass or less in the cosmetic composition.

2. The oil-in-water emulsion cosmetic according to claim 1, wherein the mass ratio of the surfactant to component (A) in the cosmetic [surfactant / component (A)] is 0.7 or less.

3. The oil-in-water emulsion cosmetic composition according to claim 1 or 2, wherein component (A) comprises one or more selected from the group consisting of a homopolymer of acrylamide, and copolymers and salts thereof that contain one or more structural units derived from acrylamide monomers selected from the group consisting of acrylamide and acryloyldimethyltauric acid.

4. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the content of component (A) in the cosmetic is 0.3% by mass or more and 3% by mass or less.

5. The oil-in-water emulsion cosmetic composition according to claim 1 or 2, wherein the fine metal oxide in component (B) comprises one or more selected from the group consisting of fine zinc oxide and fine titanium oxide.

6. The oil-in-water emulsion cosmetic composition according to claim 1 or 2, wherein the hydrophobic treatment in component (B) comprises one or more selected from the group consisting of silicone treatment, alkylalkoxysilane treatment, and fatty acid treatment.

7. The oil-in-water emulsion cosmetic composition according to claim 6, wherein the hydrophobic treatment in component (B) includes an alkylalkoxysilane treatment using triethoxycaprylylsilane as a surface treatment agent.

8. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the content of component (B) in the cosmetic is 1% by mass or more and 30% by mass or less.

9. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the content of component (C) in the cosmetic is 3% by mass or more and 30% by mass or less.

10. The oil-in-water emulsion cosmetic composition according to claim 1 or 2, wherein component (D) comprises one or more selected from the group consisting of 4-tert-butyl-4'-methoxydibenzoylmethane, 2-(4-diethylamino-2-hydroxybenzoyl)hexyl benzoate, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 2-hydroxy-4-methoxybenzophenone, drometrizole trisiloxane, and 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine.

11. An oil-in-water emulsion cosmetic according to claim 1 or 2, which is a sunscreen cosmetic.

12. Ingredient (A): Acrylamide polymer, Component (B): Hydrophobized fine particle metal oxide, Ingredient (C): An oil that is liquid at 25°C, containing ester oil (C1), and Ingredient (D): Organic UV absorber that is solid at 25°C. An oil-in-water emulsion composition containing an ultraviolet absorber that is liquid at 25°C, The content of the ester oil (C1) in the component (C) is 50% by mass or more. The content of component (D) in the composition is 0.5% by mass or more and 15% by mass or less. Use of an oil-in-water emulsion composition having a surfactant content of 0.2% by mass or less in the aforementioned cosmetic as a sunscreen cosmetic.

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