METHOD FOR PRODUCING MICROPARTICLE DISPERSION TYPE POLYMERIZABLE COMPOSITION AND MICROPARTICLE DISPERSION TYPE POLYMERIZABLE COMPOSITION PREPARED BY THE PRODUCTION METHOD

To provide: a simpler method for obtaining a polymerizable sulfur-based composition (A); and a method for producing a microparticle dispersion type cured material using a microparticle dispersion type polymerizable composition.SOLUTION: A method for producing a microparticle dispersion type polymerizable composition comprises the steps of: dissolving a sulfur-based dispersant (C), containing 2 or more sulfur atoms or 1 or more episulfide groups in a molecular structure, in a polymerizable sulfur-based composition (A) to obtain a dissolved composition; dispersing metal oxide microparticles (D) in a solvent (B), which cannot be mixed uniformly in the polymerizable sulfur-based composition (A), to obtain a dispersion composition; stirring a liquid phase, containing at least the dissolved composition and the dispersion composition, to thereby surface-modify the metal oxide microparticles (D) with the sulfur-based dispersant (C); and obtaining a microparticle dispersion type polymerizable composition comprising surface-modified metal oxide microparticles (D) dispersed in the polymerizable sulfur-based composition (A).SELECTED DRAWING: None 【課題】重合性硫黄系組成物（Ａ）を得るためのより簡便な方法、および該微粒子分散型重合性組成物を用いた微粒子分散型硬化物の製造方法の提供。【解決手段】重合性硫黄系組成物（Ａ）に、分子構造内に硫黄原子を２以上またはエピスルフィド基を１以上含む硫黄系分散剤（Ｃ）を溶解させて溶解組成物を得る工程と、前記重合性硫黄系組成物（Ａ）に均一混合されない溶媒（Ｂ）に、金属酸化物微粒子（Ｄ）を分散させて分散組成物を得る工程と、少なくとも前記溶解組成物と、前記分散組成物と、を含む液相を撹拌することにより、前記金属酸化物微粒子（Ｄ）を前記硫黄系分散剤（Ｃ）で表面修飾する工程と、前記重合性硫黄系組成物（Ａ）に分散された表面修飾金属酸化物微粒子（Ｄ）を含む微粒子分散型重合性組成物を得る工程と、を含む、微粒子分散型重合性組成物の製造方法。【選択図】なし