| 摘要 |
PROBLEM TO BE SOLVED: To provide polystyrene-based resin particles which can provide a molded foam with excellent bending elastic modulus and compression elastic modulus.SOLUTION: In polystyrene-based resin particles, the ratio (Mw1/Mw2) of the weight average molecular weight Mw1 of a surface part to the overall weight average molecular weight Mw2 is 1.05-2.0, as measured by GPC method, and the ratio (Mz1/Mz2) of the Z average molecular weight Mz1 of the surface part to the overall Z average molecular weight Mz2 is 1.05-1.5. |
