Patent ID: 11938207
Assignee: KAO CORPORATION
Field: Pharmaceuticals (Chemistry)
Classification: CPC A  C | IPC A

Claim 0:
1. 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.