PROBLEM TO BE SOLVED: To provide a method of producing porous resin particles which can easily produce porous resin particles efficiently and easily and are expected to be used, for example, as a cosmetic, a light diffusing agent, a matting agent, a diagnostic drug, a pore imparting agent, an adsorbent, a weight-reducing agent, a heat insulating material, a heat insulating paint, a white pigment, an inkjet-receiving agent and a slow release agent.SOLUTION: There is provided a method of producing porous resin particles in which a solvent having a swelling property to a resin constituting resin particles is used as a solvent and the resin particles are swollen by the solvent and then the swollen state of the swollen resin particles is changed.COPYRIGHT: (C)2014,JPO&INPIT【課題】多孔質樹脂粒子を効率よくかつ容易に製造することができ、例えば、化粧料、光拡散剤、艶消し剤、診断薬、気孔付与剤、吸着剤、軽量化剤、断熱材、断熱塗料、白色顔料、インクジェット受理剤、徐放剤などに使用することが期待される多孔質樹脂粒子を製造する方法を提供すること。【解決手段】多孔質樹脂粒子を製造する方法であって、溶媒として樹脂粒子を構成している樹脂に対して膨潤性を有する溶媒を用い、当該溶媒で樹脂粒子を膨潤させた後、膨潤した樹脂粒子の膨潤状態を変化させることを特徴とする多孔質樹脂粒子の製造方法。【選択図】図1
