| 摘要 |
PROBLEM TO BE SOLVED: To obtain a cosmetic which has low irritation to skins, solubilizes transparently and shows improved penetration to skins and stability by including a salt which is composed of a sphingosine (derivative) and an inorganic acid or the like and has a lower melting point than that of the sphingosine (derivative). SOLUTION: This cosmetic is obtained by including a salt which is composed of (A) a sphingosine (derivative), e.g. dehydrosphingosine or the like and (B) an inorganic acid, e.g. hydrofluoric acid or the like, or a 1-17C organic acid, e.g. lactic acid or the like, and has a lower melting point than that of the sphingosine (derivative). Further, the components A and B are preferably formulated in the range of the components A/B=1/0.3-1/5 in the molar ratio. Furthermore, it is favorable that the melting point of the sphingosine (derivative) is more than 40 deg.C and the components A and B are blended in proportions of 0.01-3 wt.% and 0.001-3 wt.%, respectively, based on the whole weight of the composition.
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