| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a polyethylene-based resin foamed blow molded article having a high expansion ratio, heat resistance, low temperature brittleness and uniform thickness. <P>SOLUTION: The polyethylene-based resin foamed blow molded article is obtained by melt-mixing 20 to 100 wt.% of a polyethylene-based resin (I) satisfying the following conditions and a physical blowing agent and extruding the resultant mixture to blow-mold a foamed parison. The polyethylene-based resin (I) has (A) density of≥0.935 g/cm<SP>3</SP>, (B) a melt tension of≥1 cN at 190°C, (C) a melt flow rate of≥1 g/10 min as measured at 190°C under a load of 2.16 kg and (D) an isothermal crystallization time of≥45 s at which one-quarter of a total fusion calorific value in a DSC (Differential Scanning Calorimetry) curve (X) becomes equal to an isothermal crystallization calorific value in a DSC curve (Y), wherein the DSC curve (X) is obtained by heating the polyethylene-based resin from 23°C to 160°C at a heating rate of 10°C/min, then cooling it to 23°C at a cooling rate of 10°C/min, and heating it to 200°C at a heating rate of 10°C/min again. the DSC curve (Y) is obtained by heating the polyethylene-based resin from 23°C to 160°C at a heating rate of 10°C/min, maintaining it at 160°C for 3 min, then cooling it to temperature equal to crystallization temperature of the resin +3°C at a cooling rate of 50°C/min, both curves (X) and (Y) being obtained by using a DSC method. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
