| 摘要 |
PURPOSE:The titled composition capable of providing an increased cross-sectional area of a product per unit weight of a discharge and being highly recoverable from shrinkage occurring after extrusion foaming, prepared by mixing a polyolefin resin with a PS resin, a volatile organic blowing agent, and a specified foaming improver. CONSTITUTION:The titled composition obtained by mixing (A) a polyolefin resin (e.g., high density PE) with (B) a PS resin, (C) a volatile organic blowing agent (e.g., hydrocarbon including dichlorotetrafluoroethylene), and (D) a foaming improver of the formula (wherein l and n are each 0 or an integer >=1, and m is an integer >=1). By using a combination of resin B and foaming improver D in continuously expansion-molding resin A together with blowing agent C by extrusion foaming or the like, it is possible to obtain the titled composition providing a markedly increased cross-sectional area of a product per unit weight of discharge and being highly recoverable from shrinkage occurring just after extrusion foaming.
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