An object of the present invention is to provide an external preparation for the skin, which shows an excellent effect of sufficiently protecting the living body against irritants that exist in the external environments, and a polymer material to be preferably used therein.
Provided is an external preparation for the skin obtained mixing a copolymer which comprises constituent units derived from monomers of the general formula (I), (II) and, if necessary, (IV) with the content of units (I) ranging from 5 to 25 wt % based on the total amount of all the constituent units, preferably with the contents of units (I), (II) and (IV) being 5 to 9.8 wt %, 30.2 to 45 wt %, and 50 to 60 wt %respectively, with other optional components. In the formula, R1 is H or C1-3 alkyl; R2 is C5-12 alkyl having 8 to 21 fluorine atoms; R3 is H or C1-3 alkyl; R4 is optionally hydroxylated C2-4 alkylene; R5 is H, a C1-20 aromatic group, a C1-20 aliphatic hydrocarbon group, or C1-20 acyl; and n is 4 to 50.
本发明的目的是提供一种外用制剂,该制剂表现出优异的效果,能够充分保护
生物体免受存在于外部环境中的刺激物的侵害,并提供一种最好用于其中的聚合物材料。提供了一种外用制剂,该制剂通过将包含来自通式(I)、(II)和(必要时)(IV)单体的组分单元的共聚物与单体(I)的含量在所有组分单元的总量中占5至25重量%的范围内混合,最好是单体(I)、(II)和(IV)的含量分别为5至9.8重量%、30.2至45重量%和50至60重量%,并添加其他可选组分而获得。在通式中,R1是H或C1-3烷基;R2是具有8到21个
氟原子的C5-12烷基;R3是H或C1-3烷基;R4是可选择羟基化的C2-4烷基;R5是H、C1-20芳香族基、C1-20脂肪族碳氢基或C1-20酰基;n为4至50。