PROBLEM TO BE SOLVED: To provide a surface treatment agent system which is free from the fear of hydrogen gas generation, is improved in the water proof property and in the adhesion to a skin and a hair, a surface-treated powder treated with the treatment agent system, and cosmetics containing the powder.SOLUTION: The powder surface treatment agent system contains (I) an organopolysiloxane with a specific structure or its condensed product, (II) an organopolysiloxane with a specific structure and (III) an acryl-silicone copolymer, in combinations of (I) and (II), (I) and (III), or (I), (II) and (III) with each wt. ratios of 95:5 to 5:95 for (I):(II), (I):(III) and (I):[(II)+(III)], with the proviso that (I), (II), and (III) may be separately packaged.COPYRIGHT: (C)2007,JPO&INPIT【課題】水素ガスを発生する恐れが無く、粉体の耐水性及び皮膚又は頭髪への密着性を向上する、表面処理剤系及び該処理剤系で表面処理された粉体、さらには該粉体を含む化粧料を提供する。【解決手段】(I)特定構造のオルガノポリシロキサン又はその縮合物、(II)特定構造のオルガノポリシロキサン、及び(III)アクリル-シリコーン共重合体を、(I)と(II)、(I)と(III)、又は(I)と(II)と(III)、のいずれかの組み合わせで、夫々、(I):(II)、(I):(III)、(I):[(II)+(III)]の重量比95:5~5:95で含み、但し、(I)、(II)及び(III)は夫々、個別包装されていてもよい、粉体表面処理剤系。【選択図】なし
