Expanded composite resin beads and molded article thereof

摘要

Provided is an expanded composite resin bead comprising a styrene resin and a propylene resin. The content of the propylene resin component in the expanded composite resin bead is from 20 to 40% by mass relative to a total of 100% by mass of the styrene resin component and the propylene resin component. In a transmission electron micrograph of a cross-section of a cell wall 1 forming the expanded composite resin bead, disperse phases 3 made of the styrene resin are dispersed in a continuous phase 2 made of the propylene resin. An average value of the maximum diameters of the disperse phases 3 is from 0.01 to 1 μm and a value of ratio of the average value of the maximum diameters to an average value of the minimum diameters of the disperse phases 3 is from 1 to 10.

主权项

1. An expanded composite resin bead, comprising a styrene resin and a propylene resin,
wherein: a content of the propylene resin in the expanded composite resin bead is from 20 to 40% by mass with respect to a total of 100% by mass of the styrene resin and the propylene resin; a weight average molecular weight of the styrene resin is from 300,000 to 500,000; a plurality of disperse phases comprising the styrene resin are dispersed in a continuous phase comprising the propylene resin in a cross-section of a cell wall forming the expanded composite resin bead in a transmission electron micrograph; and an average value of maximum diameters of the disperse phases is from 0.01 to 1 μm and a value of a ratio of the average value of the maximum diameters to an average value of minimum diameters of the disperse phases is from 1 to 10.