ORGANIC FINE PARTICLE AND METHOD FOR PRODUCING THE SAME

• Main Authors: NAKATANI YASUTAKA, IGAWA YOICHI, HANAI ERINA
• Format: Patent
• Language: English; Japanese
• Published: 16.05.2019
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a method for producing an organic fine particle capable of highly preventing an odor of a film into which the organic fine particle is blended.SOLUTION: In a method for producing an organic fine particle, a (meth)acrylic monomer and a bifunctional crosslinkable (meth)acrylic monomer are polymerized under the coexistence of a thermal polymerization initiator in the presence of an aqueous solvent. The thermal polymerization initiator contains a polymerization initiator (B) having a 10 hr half-life temperature of 40°C or more and a polymerization initiator (A) having a 10 hr half-life temperature higher than that of the polymerization initiator (B) by 3°C or more at a mass ratio (the polymerization initiator (A)/the polymerization initiator (B)) of 0.1-0.9.SELECTED DRAWING: None 【課題】配合するフィルムの着色を高度に防止可能な有機微粒子の製造方法を提供する。【解決手段】（メタ）アクリル系モノマーと（メタ）アクリル系二官能架橋性モノマーとを、水系溶媒の存在下、熱重合開始剤を共存させて重合する有機微粒子の製造方法であり、前記熱重合開始剤が、１０時間半減期温度が４０℃以上である重合開始剤（Ｂ）と、該重合開始剤（Ｂ）よりも１０時間半減期温度が３℃以上高い重合開始剤（Ａ）とを、重合開始剤（Ａ）と重合開始剤（Ｂ）の質量比（重合開始剤（Ａ）／重合開始剤（Ｂ））が０．１〜０．９となる範囲で含む方法。【選択図】なし