| 摘要 |
PROBLEM TO BE SOLVED: To industrially favorably provide a rubber-modified styrenic resin which has a better balance between impact strength and transparency than before and gives a sheet with little soil, when molded and a sheet from the resin. SOLUTION: The rubber-modified styrenic resin is a thermoplastic resin composition containing (X) a copolymer of a styrenic monomer unit and a (meth)acrylate monomer unit and (Y) a rubbery substance. The copolymer (X) forms a continuous phase and the rubbery substance forms a particle dispersed phase. The particle dispersed phase comprises (I) a dispersed particle with a number average particle diameter of 1.0-2.0μm and (II) a dispersed particle with a number average particle diameter of 0.1-0.5μm. The amount of the rubber component contained in the dispersed particle (I) is 0.2-3.5 mass% and in the dispersed particle (II) is 4-20 mass%. The rubber-modified styrenic resin which gives a sheet with little soil, when molded is constituted in a way that 4,000-8,000 ppm of a mercapto residue is contained in the rubber-modified styrenic resin in which the ratio of the weight average molecular weight to the number average molecular weight of the THF-soluble fraction of the thermoplastic resin is≤2.5. COPYRIGHT: (C)2004,JPO&NCIPI
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