PROBLEM TO BE SOLVED: To provide a new polyester composition which has high adhesion, has high aesthetic properties and is excellent in biocompatibility.SOLUTION: A polyester composition contains a polymer having a gallic acid skeleton selected from a homopolymer (X) composed of a first monomer formed of (A) a gallic acid or a gallic acid derivative, or a copolymer (Y) that is composed of the first monomer formed of (A) the gallic acid or the gallic acid derivative and a second monomer having (B) a carboxyl group capable of ester bonding with the first monomer and a hydroxyl group and has a copolymer ratio of the first monomer of 1 mol% or more.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】高い接着性を有し審美性が高く、また生体親和性に優れる新規なポリエステル組成物を得る。【解決手段】（Ａ）没食子酸または没食子酸誘導体からなる第１のモノマーで構成される単独重合体（Ｘ）、または（Ａ）没食子酸または没食子酸誘導体からなる第１のモノマーと、（Ｂ）前記第１のモノマーとエステル結合可能なカルボキシル基及び水酸基を有する第２のモノマーとで構成される前記第１のモノマーの共重合体比率が１モル％以上の共重合体（Ｙ）から選択される没食子酸骨格を有する重合体を含有するポリエステル組成物とする。【選択図】なし
