STYRENE-BASED RESIN EXPANDABLE BEADS AND METHOD FOR PRODUCING THE SAME, AND STYRENE-BASED RESIN EXPANSION MOLDED FORM

摘要

PROBLEM TO BE SOLVED: To provide styrene-based resin expandable beads slight in the escape of a volatile foaming agent even at ordinary pressures and temperatures, easy to store and transport after produced, expandable highly, and capable of producing foam higher in impact resistance and cushionability than styrene resin foam, and to provide an expansion molded form obtained from the above beads. SOLUTION: The styrene-based resin expandable beads comprises (i) a resin composition comprising a styrene-based resin(a), a styrene-based elastomer(b) and an olefin resin(c) and the volatile foaming agent. Specifically, in this composition, the resin composition(i) is a blended resin and comprises 60-80 mass% of (a) the styrene-based resin containing 2-8 mass% of a rubber component, 10-30 mass% of (b) the styrene-based elastomer consisting of a copolymer of styrene and a conjugated diene or its hydrogenated product, and 5-20 mass% of (c) the olefin resin consisting of a polyethylene-based resin 0.880-0.910 g/cm3in density. COPYRIGHT: (C)2007,JPO&INPIT