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US 2025/0152484 A1Published application
Oil-in-water emulsion skin preparation for external use
AssigneeKao Corporation
InventorsTomoya FUJII, Shingo HIRONO
Life of this patent
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Abstract
Provided are an external preparation for skin of oil-in-water type emulsification containing silica particles having an average particle diameter of 0.3 μm to 3 μm; at least one selected from the group consisting of a cationic polymer having a hydrophobic moiety, and a cationic surfactant having an alkyl group; an oily component; and an aqueous component, and a method for producing the external preparation for skin of oil-in-water type emulsification
Claims9
1:
- An external preparation for skin of oil-in-water type emulsification, comprising components (A), (B), (C), and (D):
- (A) silica particles having an average particle diameter of from 0.3 μm to 3 μm;
- (B) at least one selected from the group consisting of (B1) a cationic polymer having a hydrophobic moiety, and (B2) a cationic surfactant having an alkyl group;
- (C) an oily component;
- and
- (D) an aqueous component.
3 more elements
2:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, wherein the component (A) is aligned at an interface between the water phase and the oil phase.
3:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, wherein the cationic polymer or the cationic surfactant as the component (B) is adsorbed to the silica particles as the component (A).
4:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, further comprising a component (E) as a thickener.
5:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, wherein the component (B1) is a cationic polymer having at least one type of hydrophobic moiety selected from the group consisting of a polysiloxane moiety, a hydrocarbon moiety, and an alkyleneoxy moiety having at least 3 carbon atom.
6:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, wherein the component (B1) is at least one selected from the group consisting of a cationic silicone, a cationic vinyl polymer, and a cationized cellulose derivative.
7:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, wherein a content of the component (A) is at least 0.5 mass %.
8:
- The external preparation for skin of oil-in-water type emulsification according to claim 1, wherein the component (C) comprises at least one selected from the group consisting of an ultraviolet absorber and an ester oil.
9:
- A method for producing the external preparation for skin of oil-in-water type emulsification according to claim 1, the method comprising:
- mixing the component (A) with the component (B) in water.