US 12,351,706 B2
Polyethylene composition for blow molding having an improved swell behavior
Ulf Schueller, Weiterstadt (DE); Sebastian Wilhelm, Mainz-Kastel (DE); Harald Schmitz, Weinheim (DE); Andreas Maus, Frankfurt (DE); Bernd Lothar Marczinke, Römerberg (DE); Elke Damm, Bad Vilbel (DE); Gerhardus Meier, Frankfurt (DE); Eric D. Day, Florence, KY (US); Sameer D. Mehta, Mason, OH (US); and Harilaos Mavridis, Lebanon, OH (US)
Assigned to Basell Polyolefine GmbH, Wesseling (DE)
Filed by Basell Polyolefine GmbH, Wesseling (DE)
Filed on Sep. 15, 2022, as Appl. No. 17/945,329.
Prior Publication US 2024/0093009 A1, Mar. 21, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. C08F 210/16 (2006.01); C08F 110/02 (2006.01); C08K 5/14 (2006.01); C08L 23/06 (2006.01)
CPC C08L 23/06 (2013.01) [C08F 110/02 (2013.01); C08F 210/16 (2013.01); C08K 5/14 (2013.01); C08F 2800/10 (2013.01); C08L 2207/062 (2013.01)] 17 Claims
 
1. A polyethylene composition having the following features:
1) ratio MIF/MIE from 60 to 125, where MIF is melt flow index at 190° C. with a load of 21.60 kg, and MIE is melt flow index at 190° C. with a load of 2.16 kg, both determined according to ISO 1133-2:2011;
2) MIF from 15 to 40 g/10 min;
3) density from 0.955 to 0.965 g/cm3, determined according to ISO 1183-1:2012 at 23° C.;
4) ER value from 3.0 to 5.5;
5) η0.02 equal to or lower than 150,000 Pa·s;
where η0.02 is the complex viscosity of a melt, measured at a temperature of 190° C., in a parallel-plate rheometer under dynamic oscillatory shear mode with an applied angular frequency of 0.02 rad/s;
ER is calculated from:
ER=(1.781*10−3)*G′
at a value of G″=5,000 dyn/cm2;
wherein:
G′=storage-modulus;
G″=loss-modulus;
both G′ and G″ being measured with dynamic oscillatory shear in a plate-plate rotational rheometer at a temperature of 190° C.