| 摘要 |
PURPOSE:A polyethylene composition having improved mechanical properties, which comprises predominantly a high-pressure polyethylene having a specific melt tension, a melt index, a density and a proportion of vinyl acetate structural units. CONSTITUTION:At least 80wt% of a high-pressure polyethylene having a melt tension of 4.5-8g, a melt index of 0.05-0.5g/10min and a density of 0.930- 0.940g/cm<3> and a vinyl acetate structural unit content of 1-5%, is incorporated. Synthetic resins which can be used, other than said high-pressure polyethylene, include thermoplastic ethylene resins such as medium- and low-pressure polyethylenes and polypropylenes. The proportion of such a thermoplastic resin is preferably within 5wt%. As additives which can be used, there can be mentioned ultraviolet inhibitors and antioxidants. For example, about 0.5-10wt% of carbon black is added. |
