Polymer

摘要

A multimodal linear low density polyethylene polymer having a final density of 900 to 940 kg/m 3 , and containing at least one ±-olefin comonomer in addition to ethylene comprising:
(A) 30 to 60 wt% of a lower molecular weight component being an ethylene homopolymer or a copolymer of ethylene and at least one ±-olefin;
and
(B) 70 to 40 wt% of a higher molecular weight component being a copolymer of ethylene and at least one ±-olefin, said ±-olefin being the same or different from any ±-olefin used in component (A) but with the proviso that both components (A) and (B) are not polymers of ethylene and butene alone;
wherein the multimodal LLDPE has a dart drop of at least 700 g;
and wherein components (A) and (B) are obtainable using a Ziegler-Natta catalyst.