PROBLEM TO BE SOLVED: To provide: a polymer which can stabilize and release an ascorbic acid derivative or a salt thereof a method of producing the same a fine particle containing the polymer and a skin external preparation, a controlled-release preparation, and a stabilizer of an ascorbic acid derivative or a salt thereof which contain the particulate polymer.SOLUTION: The polymer includes a unit structure represented by the general formula (I). (X represents a monovalent or polyvalent anion of an ascorbic acid derivative.)COPYRIGHT: (C)2015,JPO&INPIT【課題】アスコルビン酸誘導体又はその塩を安定化し、放出できるポリマー及びその製造方法、並びに、前記ポリマーを含む微粒子、また、前記微粒子ポリマーを含む、皮膚外用剤、アスコルビン酸誘導体又はその塩の安定化剤及び徐放剤の提供。【解決手段】一般式(I)で表される単位構造を含むポリマー。(Xは、アスコルビン酸誘導体の1価又は多価アニオンを表す。)【選択図】なし
