PROBLEM TO BE SOLVED: To provide a polymer nanosphere of phosphorylcholine-group-containing polymer used in the fields of cosmetics and the like, its use and a preparation process thereof.SOLUTION: The polymer nanosphere is formed from a polymer which has a weight average molecular weight of 5,000-5,000,000 and is prepared by polymerizing 5-60 mol% monomer (PC monomer) represented by formula (1) and 40-95 mol% (meth)acrylic ester having 10-22C (LA monomer). The polymer nanosphere, in which the particle size of the polymer nanosphere is 5-500 nm, is formed by performing processes (1) and (2) under temperature conditions of &ge40°C, in which process (1) is a process for dissolving or dispersing a polymer into a mixed solution of water and an alcohol and process (2) is a process for adding water to solution or dispersion of a polymer obtained by process (1) to form the polymer nanosphere.COPYRIGHT: (C)2009,JPO&INPIT【課題】化粧料等の分野において利用されるホスホリルコリン基含有重合体のポリマーナノスフェア、ならびにその用途及び製造方法の提供。【解決手段】で示される単量体(PC単量体)と炭素数10~22の(メタ)アクリル酸エステル(LA単量体)の重合体であってPC単量体5~60モル%及びLA単量体40~95モル%の割合で重合された重量平均分子量5,000~5,000,000の重合体から形成されたポリマーナノスフェアであり、40℃以上の温度条件下で、下記工程(1)及び(2)の工程を実施することにより形成された粒径5~500nmのポリマーナノスフェア。工程(1):重合体を水とアルコールとの混合液に溶解又は分散させる工程、工程(2):工程1で得られた重合体の溶液又は分散液に水を添加しポリマーナノスフェアを形成させる工程。【選択図】なし
