| 摘要 |
PURPOSE: To make extrusion workability consistent with electric characteristics by using a low density polyethylene composition having a specified range of melt flow rate, the number of branching, number-average molecular weight, and activation energy as an insulator composition. CONSTITUTION: A low density polyethylene(LDPE) composition having a melt flow rate(MFR) of 0.7 or more, a branching number(MFR measured value) of 30/1000C or less, a number-average molecular weight(MFR measured value) of 1000-18000, and an activation energy in melting calculated from viscosity of 7.0×10<4> /molK(absolute temperature) or less is used as an insulating composition for a power cable. Extrusion workability of LDPE becomes good with increase in MFR and electric characteristics become good with decrease in MFR. In order to satisfy both, balancing of values mentioned above in a suitable range is effective.
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