The present invention, also the number of carbon atoms in the polyfluoroalkyl group is 6 or less Regardless, excellent provision of water-repellent cosmetic both having oil repellent polymer and the surface-treating agent comprising the same were, furthermore, cosmetic powders and for the cosmetic which is excellent in water and oil repellency which is treated by the surface treatment agent It is intended and it is an object to provide a cosmetic comprising a powder cosmetic both critical condition of the present invention, 70 to 90 wt% structural units (A) derived from the compound represented by the following formula (a), the following formulas 2 to 25 wt% structural units (B) derived from the compound represented by (b), 2~25 wt% of the constitutional unit (C) derived from the compound represented by the following formula (c), the following formula (d) 0.1~10 wt% of structural units (D) derived from the compound represented by and the OH group or a chain transfer agent containing a COOH group cosmetics containing residue (E) of the (e) It is iodine copolymer. CH2 = CR1-COO-Q1-Rf (a) CH2 = CR2-Q2-COOH (b) CH2 = CR3-COO- (R4O) n-R5 (c) CH2 = CR7-COO-Q3-P (O) ( OH) -R8 (d)本発明は、ポリフルオロアルキル基の炭素数が6以下であるにも拘らず、優れた撥水撥油性を有する化粧品用共重合体およびそれを含む表面処理剤の提供、さらに、当該表面処理剤により処理された撥水撥油性に優れる化粧用粉体および該化粧用粉体を含む化粧料の提供を目的とするものであり、本発明の化粧品用共重体は、下記式(a)で表される化合物から導かれる構成単位(A)を70~90質量%、下記式(b)で表される化合物から導かれる構成単位(B)を2~25質量%、下記式(c)で表される化合物から導かれる構成単位(C)を2~25質量%、下記式(d)で表される化合物から導かれる構成単位(D)を0.1~10質量%およびOH基またはCOOH基を含有する連鎖移動剤(e)の残基(E)を含む化粧品用共重合体である。CH2=CR1-COO-Q1-Rf (a)CH2=CR2-Q2-COOH (b)CH2=CR3-COO-(R4O)n-R5 (c)CH2=CR7-COO-Q3-P(O)(OH)-R8 (d)
