| 摘要 |
PROBLEM TO BE SOLVED: To provide a polystyrene resin composition for extrusion foaming which allows improvement of productivity in molding while reducing elution of styrene monomers and oligomers into a formed molded article.SOLUTION: A polystyrene resin composition for extrusion foaming has following properties: (1) a top peak molecular weight (Mp) in the molecular weight distribution is 140,000-220,000; (2) the ratio of molecular weights equal to or lower than Mp is 40-55% of the whole; (3) the z+1 average molecular weight is 800,000-3,500,000; (4) the content of oligomers consisting of styrene dimers and trimers is 2,000 ppm or lower; and (5) the content of styrene monomers is 1,000 ppm or lower. |
