| 摘要 |
<p>A semiconductive resin composition essentially comprising 100 parts by weight of a base resin which comprises an olefinic polymer having a crystalline melting point of lower than 86 °C or a mixture of said olefinic polymer with another olefinic polymer having a crystalline melting point of 100 °C or above, does not have any crystalline melting point in the temperature range from 86 °C to lower than 100 °C and has a crystallinity of 20 to 35 %, and 40 to 80 parts by weight of conductive carbon black comprising acetylene black and/or furnace black. A rubber/plastic insulated power cable wherein the internal and/or external semiconductive layer is formed from the above composition or the cross-linked derivative thereof. Since the crystalline part of this composition does not melt at the service temperature of the cable, the composition serves to control the lowering and destabilization of conductivity, to inhibit the rise of a tan δ value, and to prevent the performance of the power cable from being deteriorated.</p> |
