Patent ID: 7714072
Filing Date: 2010-05-11
Classification: B29C,C08F,C08L,Y10S

Abstract:
1. A multimodal polyethylene composition having; 1) a density of at least about 0.940 g/cm 2) a melt flow index (I 3) a melt flow index ratio (I 4) a molecular weight distribution, Mw/Mn, of from about 20 to about 40; and 5) a bubble stability measured on an HS50S stationary extrusion system with an BF 10-25 die, HK 300 air ring, A8 take off, and WS8 surface winder, all commercially available from Hosokawa Alpine Corporation, with a 100 mm die diameter having a 50 mm 21:1 L/D grooved feed extruder used according to the conditions described herein for a film of about 6×10 6) a dart impact on 12.5 micron (1.25×10 the composition comprising a blend comprising; wherein said blend is melted in an extruder having a mixer vent, wherein the mixer vent has an oxygen concentration of from about 0.05 to about 6 volume percent oxygen in nitrogen; and the extrusion temperature is sufficient to melt the blend and result in tailoring the blend in the presence of the oxygen; and wherein said molten blend is passed through one or more active screens, wherein in the case of two or more active screens, the screens are positioned in series, each active screen having a micron retention size of from about 2 to about 70, at a mass flux of about 5 to about 100 lb/hr/in