| 摘要 |
PROBLEM TO BE SOLVED: To reduce moisture absorption quantity, to make DC leakage current very little and to suppress production of voids by blending graphitized carbon black by specified quantity with ethylene-based copolymer having specified crystallinity. SOLUTION: As base resin, ethylene-based copolymer of crystallinity of 30% or below is used. By blending graphitized carbon black by 30 to 70 pts.wt. with 100 pts.wt. of this ethylene-based copolymer, resin composition for semi- conductive layer is obtained. As compositions of ethylene-based copolymer, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer and ethylene- propylene copolymer are given. Graphitized carbon black is one in which carbon black such as furnace black is treated at a high temperature of about 2,000 to 3,000 deg.C in inactive atmosphere and crystal within particle is grown in a state such that an original particle diameter is held. In this graphitized carbon black, impurity is reduced, heat resistance is improved and absorbing property of moisture is reduced.
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