Play expandable styrene resin particles, foam beads and foam moldings

摘要

A process for producing expandable reclaimed-styrene resin particles 10 which comprises suspending particles of a reclaimed styrene resin as nuclei in an aqueous medium, adding a polymerization initiator to this suspension to infiltrate the initiator into the reclaimed-styrene resin particles, subsequently adding a styrene monomer to conduct polymerization, and then infiltrating a blowing agent into the particles. It is possible to dissolve the polymerization initiator in a styrene monomer and infiltrate this initiator into the reclaimed-styrene resin particles. The polymerization reaction can be conducted while the oxygen concentration in the reaction tank is kept low in at least a later part of the polymerization, whereby the surface 1 can have a high weight-average molecular weight.