Cosmetic composition for skin
AssigneeKao Corporation
InventorTeruyuki FUKUDA
Life of this patent
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Abstract
The present invention relates to a cosmetic composition for skin containing a solvent A, a solvent B, and a polymer C, wherein a boiling point of the solvent A is lower than 99° C., and a distance Ra of the Hansen solubility parameter of the solvent A to water is 36 or less; a boiling point of the solvent B is 150° C. or higher, and a distance Ra of the Hansen solubility parameter of the solvent B to water is 40 or more; and the solvent B is compatible with the solvent A, and the polymer C is soluble in the solvent A but insoluble in the solvent B; and to a cosmetic coating film for skin,
Claims20
A cosmetic composition for skin comprising a solvent A, a solvent B, and a polymer C, wherein
- a boiling point of the solvent A is lower than 99° C., and a distance Ra of the Hansen solubility parameter of the solvent A to water as expressed by the following equation (1) is 36 or less,
- a boiling point of the solvent B is 150° C. or higher, and a distance Ra of the Hansen solubility parameter of the solvent B to water as expressed by the following equation (1) is 40 or more,
- the solvent B is compatible with the solvent A,
- the polymer C is soluble in the solvent A but insoluble in the solvent B,
- a content of the solvent A in the cosmetic composition is 50% by mass or more and 90% by mass or less,
- a content of the solvent B in the cosmetic composition is 5% by mass or more and 40% by mass or less, and
- a content of the polymer C in the cosmetic composition is 2% by mass or more and 15% by mass or less:
- Ra=(4×ΔD2+ΔP2+ΔH2)0.5 (1)
- wherein,
- ΔD is a difference of dispersing component in the Hansen solubility parameter between a solvent and water,
- ΔP is a difference of a polar component in the Hansen solubility parameter between a solvent and water, and
- ΔH is a difference of hydrogen-binding component in the Hansen solubility parameter between a solvent and water.
Dependencies are inferred from the claim text.