PROBLEM TO BE SOLVED: To provide a novel method of efficiently manufacturing a disk-like polymer particle assemblage.SOLUTION: The method of manufacturing a disk-like polymer particle assemblage having an average of aspect ratios calculated by longest diameters and shortest diameters of flattened parts of 1-1.3 includes: subjecting a monomer including a hydrophobic unsaturated monomer in the form of a liquid at 25°C to solution polymerization in a solvent in the presence of a polymerization initiator, a surface active agent, and/or a polymer stabilizer, where a solvent mixture composed of water, a hydrophilic organic solvent, and a hydrophobic organic solvent is used as the solvent, and one or two or more of initiators dissolving in at least one of water, the hydrophilic solvent, and the hydrophobic solvent are used in combination of dissolving in any of water, the hydrophilic solvent, and the hydrophobic solvent as the polymerization initiator so that the hydrophobic unsaturated monomer, water, the hydrophilic organic solvent, and the hydrophilic organic solvent make a predetermined blending ratio.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】効率よく円盤状ポリマー粒子群を製造することが可能な新規な方法を提供する。【解決手段】溶媒中、重合開始剤、界面活性剤及び／又は高分子安定剤の存在下で、２５℃で液状の疎水性不飽和単量体を含む単量体を溶液重合させる、扁平部の最長径と最短径とから算出されるアスペクト比の平均が１～１.３を満たす円盤状ポリマー粒子群の製造方法であって、前記溶媒として、水、親水性有機溶媒、及び疎水性有機溶媒の混合溶媒を用い、前記重合開始剤として、前記水、親水性有機溶媒及び疎水性有機溶媒の少なくとも１種に溶解する１種又は２種以上を、前記水、親水性有機溶媒及び疎水性有機溶媒のいずれにも溶解する組み合わせで用いて、前記疎水性不飽和単量体、水、親水性有機溶媒及び疎水性有機溶媒を所定の配合比率とする円盤状ポリマー粒子群の製造方法。【選択図】なし
