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JP-7855756-B2 - Cosmetic composition

JP7855756B2JP 7855756 B2JP7855756 B2JP 7855756B2JP-7855756-B2

Inventors

  • 福田 輝幸

Assignees

  • 花王株式会社

Dates

Publication Date
20260508
Application Date
20250318
Priority Date
20200608

Claims (10)

  1. A cosmetic composition containing solvent A, solvent B, polymer C, and a coloring agent. The solvent A is one or more selected from ethanol, n-propanol, and isopropanol. The boiling point of solvent B is 150°C or higher, and the distance Ra of the Hansen solubility parameter of solvent B with respect to water, represented by the following formula (1), is 40 or higher. The solvent B is miscible with the solvent A, and the polymer C is soluble in the solvent A and insoluble in the solvent B. The content of solvent A in the cosmetic composition is 30% by mass or more and 90% by mass or less. The content of solvent B in the cosmetic composition is 15% by mass or more and 25% by mass or less. Furthermore, it contains a dispersible polymer D, A cosmetic composition comprising the coloring agent dispersed in the dispersible polymer D. Ra=(4×ΔD 2 +ΔP 2 +ΔH 2 ) 0.5 (1) ΔD: Difference in dispersion component in the Hansen solubility parameters of solvent B and water. ΔP: Difference in polar component in the Hansen solubility parameters of solvent B and water. ΔH: Difference in hydrogen bonding component in the Hansen solubility parameters of solvent B and water.
  2. The cosmetic composition according to claim 1, wherein the content of solvent A in the cosmetic composition is 40% by mass or more and 80% by mass or less.
  3. The cosmetic composition according to claim 1 or 2 , wherein the dispersible polymer D is soluble in solvent A and insoluble in solvent B.
  4. The cosmetic composition according to any one of claims 1 to 3 , wherein polymer C contains a polymer comprising at least one selected from an acidic monomer, a basic monomer, and a betaine monomer as a constituent unit.
  5. The cosmetic composition according to any one of claims 1 to 4 , wherein solvent B is one or more selected from volatile hydrocarbon oils and volatile silicone oils.
  6. A cosmetic composition according to any one of claims 1 to 5 , wherein the water content is 5% by mass or less.
  7. The cosmetic composition according to any one of claims 1 to 6 , wherein the polymer C content is 0.5% by mass or more and 15% by mass or less.
  8. The cosmetic composition according to any one of claims 1 to 7 , wherein the content of the coloring agent is 1% by mass or more and 15% by mass or less.
  9. A cosmetic composition for hair, according to any one of claims 1 to 8 .
  10. A cosmetic coating film formed from the cosmetic composition described in any one of claims 1 to 9 .

Description

This invention relates to a cosmetic composition, a cosmetic method using the cosmetic composition, and a cosmetic coating film formed from the cosmetic composition. Traditionally, makeup cosmetics have incorporated highly opaque inorganic pigments such as titanium dioxide, zinc oxide, and iron oxide to cover blemishes, dullness, and pores on the skin, and to improve the brightness of the applied finish. For example, Patent Document 1 describes a cosmetic composition containing titanium dioxide with an average particle size of 0.2 μm or more and resin fine particles with an average particle size of 0.01 to 100 μm, for the purpose of providing a cosmetic composition that provides high whiteness and opacity. Furthermore, Patent Document 2 describes a cosmetic composition that, for the purpose of providing long-lasting concealment of skin imperfections, contains a plate-type filler having a predetermined refractive index and particle size, a silicone elastomer, and a filler having an oil absorption capacity of 1 ml/g or more in a physiological medium. Japanese Patent Publication No. 2016-121137Special Publication No. 2015-520120 [Cosmetic composition] The cosmetic composition of the present invention is a cosmetic composition containing solvent A, solvent B, polymer C, and a colorant, wherein solvent A is one or more selected from ethanol, n-propanol, and isopropanol, solvent B has a boiling point of 150°C or higher, and the distance Ra of the Hansen solubility parameter of solvent B with respect to water represented by the following formula (1) is 40 or higher, solvent B is miscible with solvent A, and polymer C is soluble in solvent A but insoluble in solvent B. Ra=(4×ΔD 2 +ΔP 2 +ΔH 2 ) 0.5 (1) ΔD: Difference in dispersion component in the Hansen solubility parameters of solvent B and water ΔP: Difference in polar component in the Hansen solubility parameters of solvent B and water ΔH: Difference in hydrogen bonding component in the Hansen solubility parameters of solvent B and water In this invention, "miscibility" refers to the phenomenon in which solvent A and solvent B dissolve in each other in a mixed system containing solvent A and solvent B. Solvents A and B are determined to be in a miscible state if they do not separate into multiple phases when mixed and allowed to stand, or if they do not separate into phases and become cloudy when mixed and stirred. Furthermore, polymer C is soluble in solvent A and insoluble in solvent B, and is dissolved in the cosmetic composition. In the present invention, "polymer C is soluble in solvent A" means that when polymer C, which has been dried at 105°C for 2 hours to reach a constant weight, is dissolved in 100 g of solvent A at 25°C, the amount dissolved is 5 g or more. From the viewpoint of improving opacity and color development, the amount of polymer C dissolved in solvent A is preferably 10 g or more. In the present invention, "polymer C is insoluble in solvent B" means that when polymer C is dried at 105°C for 2 hours to reach a constant weight and then dissolved in 100 g of solvent B at 25°C until saturated, the amount of polymer C dissolved is less than 5 g. From the viewpoint of improving opacity and color development, the amount of polymer C dissolved in solvent B is preferably less than 2 g. The determination of whether something is "miscible" or "soluble" as described above should be made at 25°C. In this invention, the "Hansen solubility parameter" is expressed by dividing the solubility parameter (SP value) introduced by Hildebrand into three components (dispersion component D, polar component P, and hydrogen bonding component H). The D, P, and H values for each solvent are described in detail in "HANSEN SOLBILITY PARAMETERS" A User's Handbook Second Edition. In addition, HSP values for many solvents and resins are also described in books such as "Industrial Solvents Handbook" by Wesley L. Archer. The D, P, and H values for each solvent can also be determined using the HSPiP software from Charles Hansen Consulting, Inc. (Horsholm, Denmark, hansen-solubility.com). In this invention, for solvents registered in the HSPiP version 4.1.03 database (see the literature for various HSPs), the values are used, and for solvents not in the database, the values estimated by HSPiP are used. Furthermore, in this invention, the unit of the "Hansen solubility parameter" is "(MPa) 0.5". According to the present invention, a cosmetic coating film with excellent opacity and color development can be formed without using inorganic pigments. The reason for this is not entirely clear, but it is thought to be as follows. The cosmetic composition of the present invention contains one or more solvents A selected from ethanol, n-propanol, and isopropanol; solvent B having a boiling point of 150°C or higher and a Hansen solubility parameter distance Ra with respect to water represented by formula (1) of 40 or higher; polymer C soluble in solvent A and insoluble in solvent B; and