PROBLEM TO BE SOLVED: To provide a sustained-release particle with improved sustained-release properties.SOLUTION: A sustained-release particle 1 has a core 2 obtained by mini-emulsion polymerization of a core raw material component containing a hydrophobic anti-bioactive compound and a hydrophobic polymerizable vinyl monomer, and a shell 3 obtained by interfacial polymerization of a shell raw material component, the shell 3 to coat the core 2.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】徐放性により一層優れた徐放性粒子を提供すること。【解決手段】徐放性粒子1は、疎水性の抗生物活性化合物、および、疎水性の重合性ビニルモノマーを含有するコア原料成分をミニエマルション重合してなるコア2と、シェル原料成分を界面重合してなり、コア2を被覆するシェル3とを備える。【選択図】図1
