| 摘要 |
PURPOSE:To make the wire/cable stated in the title flame retardant by making an electric insulation layer from ethylene-alphaolefin copolymer and polyolefin with carbonyl radical, thereby providing the compound material with specific composition, density, melting point and composition ratio. CONSTITUTION:An electric insulation layer is formed with the compound material produced as a result of adding and mixing 50 to 300 weight part of a metallic oxide to 100 weight part of a polyolefin containing ethylene-alphaolefin copolymer and carbonyl radical. The above-described ethylene-alphaolefin copolymer is made to have a density of 0.85-0.91 and a melting point of 110 deg.C or higher by copolymerizing ethylene with alphaolefin having 3-12 carbons. Setting the density in such range allows to prevent the mechanical strength and flexibility of the copolymer from lowering, and making the melting point to 110 deg.C or higher allows to preserve tenacity at normal temperature. In addition, combinational use of polyolefin with carbonyl radical to which a metallic oxide is added and mixed allows to produce a flame retardant wire or cable. |
