Of the polymer which includes the unsaturated carboxyl group, and the aromatic compound hydroxyl group of 1 or more displacement (also), in rank of the unsaturated carboxyl group, being the hydrophilic material which hydrophilic polymer such as hydrophilic monomer or polyethylene glycol of tray tall and the like has joined in aromatic ring of the 4 hydroxycinnamic acid and the like, with hydrophilic, there to be living body compatibility, the hydrophilic material which can become the nano grain, especially, water-dispersion to be superior movement Characteristic to in the blood well, as a medicine support body the usefulness the hydrophilic material, the medical material and the medicine controlled release material of nano grain sizeOffer.4-ヒドロキシ桂皮酸等の芳香環にα,β-不飽和カルボキシル基、および、1以上の水酸基が置換した芳香族化合物を含む(共)重合体のα,β-不飽和カルボキシル基のβ位に、トレイトール等の親水性単量体またはポリエチレングリコール等の親水性重合体が結合している親水性材料であって、親水性で、生体適合性があり、ナノ粒子となり得る親水性材料、特に、水分散性が良く血中への移行性が優れ、薬物担持体として有用なナノ粒径の親水性材料、医用材料、薬剤徐放材料の提供。
