| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-layer structured polymer particles excellent in elastic recovery and transparency, giving low-hardness molded article excellent in flexibility and mechanical properties, and capable of being molded solely and easily. SOLUTION: The multi-layer structured polymer particles comprising at least two rubber component layers (I) adjacent to each other and formed by copolymerization of a monomer mixture comprising an acrylate and a multifunctional monomer, and a thermoplastic resin component layer (II) that has been formed by copolymerization of a methacrylate and another monomer satisfies the following conditions. (1) The number-average molecular weight of a thermoplastic resin component constituting the outermost layer is at most 30,000. (2) The weight ratio of layer (I)/layer (II) is in a range of 30/70-80/20. (3) The relationship between the solubilities of n-th layer and (n+1)th layer of the adjoining layers (I) satisfies a specific relationship in solubilities of the monomer mixture in water. (4) A specific equation is satisfied between refractive index of the layer (I) and that of the layer (II).
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