PROBLEM TO BE SOLVED: To provide a technology for forming a composition having a sea-island structure only with a water-soluble component.SOLUTION: There is provided a composition containing an amphiphatic copolymer having one or more kind of constitutional unit (a) derived from a hydrophobic monomer and one or more kind of constitutional unit (b) derived from a hydrophilic monomer as essential constitutional units, water-soluble polymer and/or a salt thereof and water and forming a coated film having a sea-island structure where an island particle containing the amphiphatic copolymer is dispersed in an aqueous gel formed by the water-soluble polymer and/or the salt thereof with evaporation of the water.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2017,JPO&INPIT【課題】水溶性成分のみで海島構造を有する組成物を形成する技術を提供する。【解決手段】疎水性モノマーから誘導される1種又は2種以上の構成単位(a)と、親水性モノマーから誘導される1種又は2種以上の構成単位(b)を必須構成単位として有する両親媒性コポリマーと、水溶性高分子及び/又はその塩と、水を含み、前記水の蒸発によって、前記水溶性高分子及び/又はその塩が形成する水性ゲル中に、前記両親媒性コポリマーを含む島粒子が分散する海島構造を有する被膜を形成することを特徴とする組成物。【選択図】図2
