| 摘要 |
<p>An insoluble powder characterized by having a ξ potential which is a negative value. The insoluble powder preferably comprises barium sulfate as the main component. The insoluble powder preferably has an average primary-particle diameter of 3 to 100 µm and an aspect ratio of from 3 to 250. The insoluble powder preferably is a metal-doped barium sulfate powder obtained by reacting barium ions with sulfate ions in the presence of metal ions. In the above insoluble powder, the metal ions preferably are ions of one or more members selected from the group of lithium, sodium, and zinc. Also provided are a powder for restoring the barrier function of the skin and a powder for preventing/mitigating skin chapping which each is characterized by comprising the insoluble powder. Further provided is a preparation for external use on the skin, characterized by containing the insoluble powder in an amount of 1 to 40 wt.%.</p> |
