PROBLEM TO BE SOLVED: To provide sustained-release particles excellent in terms not only of sustained releasability but also of dispersibility, a method for manufacturing the same, and a wood portion treatment agent using the sustained-release particles.SOLUTION: In the provided manufacturing method of sustained-release particles for producing a polymer having an average particle diameter of less than 1 μm and including at least 3-iodo-2-propynyl butyl carbamate (IPBC) and propiconazole by preparing a hydrophobic solution by dissolving at least IPBC and propiconazole within a hydrophobic polymerizable vinyl monomer, by preparing an aqueous emulsifier solution by blending water and an emulsifier, by emulsifying the hydrophobic solution within the aqueous emulsifier solution, and by mini-emulsion-polymerizing, in the presence of a polymerization initiator, the polymerizable vinyl monomer of the emulsified hydrophobic solution, the inter-dipolar force term δp,polymer of the solubility parameter δ and the hydrogen coupling force term δh,polymer of the solubility parameter δ are respectively 5.0-7.0 [(J/cm3)1/2] and 8.0-10.0 [(J/cm3)1/2].COPYRIGHT: (C)2014,JPO&INPIT【課題】徐放性は元より、分散性にも優れる徐放性粒子、その製造方法、および、徐放性粒子を用いた木部処理剤を提供すること。【解決手段】少なくともIPBCおよびプロピコナゾールを疎水性の重合性ビニルモノマーで溶解することにより、疎水性溶液を調製し、水と乳化剤とを配合して乳化剤水溶液を調製し、疎水性溶液を乳化剤水溶液中に乳化させ、乳化された疎水性溶液の重合性ビニルモノマーを、重合開始剤の存在下、ミニエマルション重合して、少なくともIPBCおよびプロピコナゾールを含有する平均粒子径1μm未満の重合体を生成する徐放性粒子の製造方法であり、溶解度パラメータδの双極子間力項δp,polymerが5.0~7.0[(J/cm3)1/2]であり、溶解度パラメータδの水素結合力項δh,polymerが8.0~10.0[(J/cm3)1/2]である。【選択図】なし
