| 摘要 |
Injection-molded object comprises a polyethylene composition comprising a first ethylene polymer having a high melt flow index and a second ethylene polymer having a low melt flow index. The composition has a defined molecular weight distribution, melt flow index and dynamic viscosity. Injection-molded object comprises a polyethylene composition comprising a first ethylene polymer having a melt flow index (MI2, measured at 190degreesC under a 2.16 kg load) of 5-1000 g/10 minutes and optionally including up to 5 wt.% of a C4-C18 diene or alpha-olefin, and a second ethylene polymer having a melt flow index (MI5, measured at 190degreesC under a 5 kg load) of 0.01-2 g/10 minutes and including 0.5-20 wt.% of a C4-C8 diene or alpha-olefin, where the MI2/MI5 ratio is 500-50000 and the weight ratio of the polymers is (30-70):(70-30). The composition has a molecular weight distribution (Mw/Mn) of 5-70, a MI5 of 0.1-10 g/10 minutes and a dynamic viscosity (eta), measured in dPa.s at 100 s1 and 190degreesC, such that the quotient of (log(177470/MI5) - logeta) divided by (2-log(2.53 x MI5)) is at least 0.652. An Independent claim is also included for a process comprising extrusion, extrusion blow molding, extrusion compression molding, calendering or injection molding of a polyethylene composition as above.
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