| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to a low-density ethylene polymer with a multimodal comonomer distribution, a method for production thereof and moulded articles, including films, made from said polymer. The multimodal polyethylene has a wide molecular weight distribution MWD in the range from 3 to 8 and contains two polymer components. The first polymer component is 70-95 wt % copolymer of ethylene with at least one C3-C20-?-olefin comonomer, having MWD less than 5, CDBI greater than 60% and high-load melt index (@21.6 kg, 190°C) of 10-100 g/10 min. The second polymer component is 5-30 wt % substantially homopolymeric polyethylene, having MWD greater than 10, CDBI greater than 80% and high-load melt index (@21.6 kg, 190°C) of 0.2-20 g/10 min. Said multimodal polyethylene is obtained in a single reactor using a catalyst system containing at least two catalysts in form of transition metal complexes.EFFECT: polyethylene disclosed herein has considerably improved resistance to mechanical factors and excellent processing properties, which enable to avoid use of process additives when processing films.13 cl, 4 dwg, 3 tbl |
