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JP-7857084-B2 - Oil-in-water emulsion cosmetic

JP7857084B2JP 7857084 B2JP7857084 B2JP 7857084B2JP-7857084-B2

Inventors

  • 上田 秀人
  • 白神 裕人
  • 内部 錦
  • 石本 安奈

Assignees

  • 株式会社 資生堂

Dates

Publication Date
20260512
Application Date
20210323

Claims (6)

  1. (A) Hydrophilic spherical silica powder, (B) Alkyl-modified carboxyvinyl polymer, (C) Oily components, and (D) Water-soluble polymers, An oil-in-water emulsion cosmetic containing, The content of (A) hydrophilic spherical silica powder is 10% by mass or more and 15% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic. The content of the oily component (C) is 0.1% by mass or more and 2.5% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic. The (D) water-soluble polymer is at least one selected from the group consisting of polyethylene glycol with a molecular weight of 4000 or more and polyvinyl alcohol with a molecular weight of 4000 or more. The content of the water-soluble polymer (D) is 0.1% by mass or more and 3.0% by mass or less , relative to the total amount of the oil-in-water emulsion cosmetic. Oil-in-water emulsion cosmetic.
  2. The oil-in-water emulsion cosmetic according to claim 1, wherein the (B) alkyl-modified carboxyvinyl polymer is an (acrylates/alkyl acrylate (C10-30)) crosspolymer.
  3. The oil-in-water emulsion cosmetic according to claim 1 or 2, wherein the content of (B) alkyl-modified carboxyvinyl polymer is 0.01% by mass or more and 0.5% by mass or less, relative to the total amount of the oil-in-water emulsion cosmetic.
  4. The oil-in-water emulsion cosmetic according to any one of claims 1 to 3, wherein the content of the water-soluble polymer (D) is 0.2% by mass or more and 3.0% by mass or less, based on the total amount of the oil-in-water emulsion cosmetic.
  5. (E) An oil-in-water emulsion cosmetic composition according to any one of claims 1 to 4, further comprising a humectant.
  6. The oil-in-water emulsion cosmetic composition according to claim 5, wherein the (E) humectant comprises at least one selected from the group consisting of glycerin, 1,3-butylene glycol, and propanediol.

Description

This invention relates to an oil-in-water emulsion cosmetic. Conventionally, various oil-in-water emulsion cosmetics have been studied for application to the skin to enhance skin texture. Such oil-in-water emulsion cosmetics require various properties during use. For example, Patent Document 1 proposes a cosmetic formulation containing specific amounts of silica powder, specific fibrous powder, and a thickening agent to achieve a sustained exfoliating effect, appropriate viscosity, spreadability, and slipperiness for a good feel on the skin, and to obtain a smooth and translucent skin texture after use. Furthermore, Patent Document 2 proposes an oil-in-water type topical skin preparation containing specific amounts of polyacrylic acid or its metal salt, alkyl-modified carboxyvinyl polymer, and specific polyethylene glycol to satisfy stringiness and usability such as freshness and non-stickiness. While various components have been considered to satisfy various properties, further improvements in these properties are needed. Japanese Patent Publication No. 2007-302563Japanese Patent Publication No. 2009-286757 [Oil-in-water emulsion cosmetic] The oil-in-water emulsion cosmetic according to the present invention contains (A) hydrophilic spherical silica powder, (B) alkyl-modified carboxyvinyl polymer, and (C) an oily component as essential components. Furthermore, the oil-in-water emulsion cosmetic according to the present invention may also contain (D) a water-soluble polymer, (E) a humectant, an aqueous solvent, and other components, depending on the purpose. The oil-in-water emulsion cosmetic according to the present invention can simultaneously improve freshness during use, non-stickiness after use, a smooth feeling, and the absence of white cast due to powder. The components contained in the oil-in-water emulsion cosmetic according to the present invention will be described in detail below. ((A) Hydrophilic spherical silica powder) As the hydrophilic spherical silica powder, any conventionally known silica powder can be used as long as it is hydrophilic and substantially spherical, preferably perfectly spherical. From the viewpoint of compatibility with other components, the silica powder is preferably porous. The volume-average particle size of the hydrophilic spherical silica powder is not particularly limited, but is preferably 1 μm to 30 μm, more preferably 2 μm to 15 μm, and even more preferably 3 μm to 10 μm. The volume-average particle size of the hydrophilic spherical silica powder can be measured according to the laser diffraction method. The oil absorption capacity of hydrophilic spherical silica powder is not particularly limited, but is preferably 10 ml/100g or more and 500 ml/100g or less, more preferably 30 ml/100g or more and 300 ml/100g or less, and even more preferably 50 ml/100g or more and 200 ml/100g or less. The oil absorption capacity of hydrophilic spherical silica powder can be measured in accordance with JIS Z 8830. The BET specific surface area of the hydrophilic spherical silica powder is not particularly limited, but is preferably 10 m² /g or more and 700 m² /g or less, more preferably 50 m² /g or more and 500 m² /g or less, and even more preferably 100 m² /g or more and 400 m² /g or less. The BET specific surface area of the hydrophilic spherical silica powder can be measured in accordance with JIS K 5101-13-2. Commercially available hydrophilic spherical silica powder can be used. Preferably, hydrophilic spherical silica powders include Sunsphere H-52, L-51S, H-121 (all from AGC SI-TEC Co., Ltd.), Godball E-6C (Suzuki Oil & Fat Industry Co., Ltd.), Satinia M5, Spherical Silica P-1500 (all from JGC Catalysts & Chemicals Co., Ltd.), and TMS-10 (Teika Co., Ltd.). The hydrophilic spherical silica powder content is 5% by mass or more, more preferably 7% to 15% by mass, and even more preferably 8% to 12% by mass, relative to the total amount of the oil-in-water emulsion cosmetic. When the hydrophilic spherical silica powder content is within the above numerical range, the oil-in-water emulsion cosmetic exhibits excellent freshness during use and a smooth, non-greasy feel after use. ((B) Alkyl-modified carboxyvinyl polymer) Suitable alkyl-modified carboxyvinyl polymers include, for example, (acrylates/alkyl acrylate (C10-C30)) crosspolymers. Commercially available (acrylates/alkyl acrylate (C10-C30)) crosspolymers may be used, such as PemulenTR-2 Polymeric Emulsifier (manufactured by Lubrizol Advanced Materials, Inc.). The content of alkyl-modified carboxyvinyl polymer is preferably 0.01% to 0.5% by mass, more preferably 0.02% to 0.2% by mass, and even more preferably 0.05% to 0.15% by mass, based on the total amount of the oil-in-water emulsion cosmetic. When the content of alkyl-modified carboxyvinyl polymer is within the above numerical range, the oil-in-water emulsion cosmetic exhibits excellent freshness during use. ((C) Oily component) Examples of oily components that can be u