Are obtained from manufacturing method of the reforming polypropylene regin foaming body, manufacturing method, and those manufacturing methods of the formation item the foaming body and the formation item

摘要

PURPOSE: To improve the heat resistance, heat-insulating properties, chemical resistance, and impact resistance in refrigeration and transport by mixing a base resin with an ethylene/butene random copolymer. CONSTITUTION: Up to 98 wt.% base resin consisting of either a propylene homopolymer which gives, upon analysis by gel permeation chromatography (GPC), a camel-shaped mol.wt. distribution curve showing the presence of branched polymers in a high-mol. region and has a Z-average mol.wt. of 2.0106 or higher and an MZ/MW (weight-average mol.wt.) ratio of 3.0 or higher, or an ethylene/propylene copolymer based on the propylene homopolymer and having an ethylene content of 1-10wt.%, is compounded with 2-40wt.% modifier consisting of an ethylene/butene random copolymer having a butene content of 5-30wt.% and a density of 0.86-0.92g/cm3 optionally together with a small amount of an elastomer, e.g. a polyethylene resin, and further with an inorganic filler in an amount of 10-50wt.% based on all resins. The compound is fed to an extrusion foaming machine and a foaming agent is added thereto. The resulting mixture is thermally melted and extruded with a die.