STYRENE-MODIFIED PARTICLE OF LINEAR LOW-DENSITY POLYETHYLENE RESIN, EXPANDABLE STYRENE-MODIFIED PARTICLE OF LINEAR LOW-DENSITY POLYETHYLENE RESIN, PROCESSES FOR PRODUCING THESE, PRE-EXPANDED PARTICLE, AND MOLDED FOAM

摘要

A method for producing styrene-modified linear low-density polyethylene-based resin beads, which includes the steps of: dispersing 100 parts by weight of non-crosslinked linear low-density polyethylene-based resin beads which are polymerized using a metallocene compound as a catalyst and contain an inorganic nucleating agent, 50 to 800 parts by weight of a styrene-based monomer and 0.1 to 0.9 parts by weight of a polymerization initiator relative to 100 parts by weight of the styrene-based monomer into an aqueous suspension containing a dispersant; impregnating the polyethylene-based resin beads with the styrene-based monomer under heating the resulting dispersion at such a temperature that the styrene-based monomer does not substantially polymerize; and performing polymerization of the styrene-based monomer at a temperature of (T + 10) to (T + 35)°C where T°C is a crystallization peak temperature of the polyethylene-based resin beads.