PROBLEM TO BE SOLVED: To provide a natural product-derived humectant having improved moisture retention.SOLUTION: A humectant comprises a polyaspartic acid derivative having a repeating unit (A) with a side chain of polyaspartic acid amidated with polyether amine, and a repeating unit (B) with its side chain being free carboxylic acid or salt thereof, where a molar ratio (A):(B) between the repeating unit (A) and repeating unit (B) is 5:95-50:50.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】保湿性を向上した天然物由来の保湿剤の提供。【解決手段】ポリアスパラギン酸の側鎖がポリエーテルアミンによりアミドされた繰り返し単位(A)と、側鎖が遊離カルボン酸或いはその塩である繰り返し単位(B)を持ち、繰り返し単位(A)と繰り返し単位(B)のモル比(A):(B)が5:95~50:50であるポリアスパラギン酸誘導体を含有する保湿剤。【選択図】なし
