PROBLEM TO BE SOLVED: To provide a silicone monomer having a fluorine-containing hydrocarbon group capable of simply being prepared, high in general purpose property of engineering, having sufficient oxygen permeability and excellent lipid stain resistance as well as high transparency, and suitable for use in medical devices, especially contact lenses.SOLUTION: There is provided a silicone monomer represented by the formula (a), where X is an oxygen atom or NH, Ra is H or a methyl group, Rb is a siloxanyl group, Rc is a linear/branched C1 to 20 fluorine-containing hydrocarbon group, Y is an ether bond, an ester bond, an ethylene oxide having a hydrogen group in a side chain or the like, and L is a linear/branched C1 to 10 bivalent hydrocarbon group.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】簡便に調製が可能で、設計の汎用性が高く、十分な酸素透過性を有し耐脂質汚染性に優れ、かつ透明度が高いメディカルデバイス特にコンタクトレンズに用いるのに好適な含フッ素炭化水素基を有するシリコーンモノマーを提供する。【解決手段】式(a)で表されるシリコーンモノマー。(Xは酸素原子又はNH;RaはH又はメチル基;Rbはシロキサニル基;Rcは直鎖/分岐状のC1~20の含フッ素炭化水素基;Yはエーテル結合、エステル結合、側鎖に水酸基を有するエチレンオキサイド等;Lは直鎖/分岐状のC1-10の二価の炭化水素基)【選択図】なし
