POLYOLEFIN COMPOSITIONS, ARTICLES MADE THEREFROM AND METHODS FOR PREPARING THE SAME
The invention provides compositions for blow molding applications and other applications, where such compositions comprise a high density ethylene polymer and a high molecular weight ethylene polymer. In these compositions, the high density ethylene polymer has a density greater than the density of the high molecular weight ethylene polymer, and the high molecular weight ethylene polymer has a weight average molecular weight greater than the weight average molecular weight of the high density ethylene polymer, and in addition, the high density ethylene polymer has a density from 0.94 g/cm 3 to 0.98 g/cm 3 , and a molecular weight distribution, Mw/Mn, greater than 8, and the high molecular weight ethylene polymer has a weight average molecular weight greater than 200,000 g/mole, and a molecular weight ratio, Mz/Mw, less than 5.
1 . A composition comprising a high density ethylene polymer and a high molecular weight ethylene polymer, and wherein
the high density ethylene polymer has a density greater than the density of the high molecular weight ethylene polymer, and
the high molecular weight ethylene polymer has a weight average molecular weight greater than the weight average molecular weight of the high density ethylene polymer, and
wherein the high density ethylene polymer has a density from 0.94 g/cm 3 to 0.98 g/cm 3 , and a molecular weight distribution, Mw/Mn, greater than 8, and
the high molecular weight ethylene polymer has a weight average molecular weight greater than 200,000 g/mole, and a molecular weight ratio, Mz/Mw, less than 5.
2 . The composition of claim 1 , wherein the composition has a HLMI greater than 20 g/10 min.
3 . The composition of claim 1 , wherein the high density ethylene polymer has a density from 0.94 g/cm 3 to 0.97 g/cm 3 .
4 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a weight average molecular weight greater than 300,000 g/mole.
5 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a molecular weight distribution, Mw/Mn, less than 5.
6 . The composition of claim 1 , wherein the composition has a HLMI greater than 25 g/10 min.
7 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a density from 0.90 g/cm 3 to 0.94 g/cm 3 .
8 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a density from 0.90 g/cm 3 to 0.93 g/cm 3 .
9 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a density from 0.90 g/cm 3 to 0.92 g/cm 3 .
10 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a weight average molecular weight greater than 300,000 g/mole.
11 . The composition of claim 1 , wherein the high molecular weight ethylene polymer has a weight average molecular weight greater than 400,000 g/mole.
12 . The composition of claim 1 , wherein the high density ethylene polymer has a density from 0.945 g/cm 3 to 0.965 g/cm 3 .
13 . The composition of claim 1 , wherein the high density ethylene polymer has a molecular weight distribution, Mw/Mn, greater than 10.
14 . The composition of claim 1 , wherein the high molecular weight ethylene polymer is an ethylene/α-olefin interpolymer.
15 . The composition of claim 14 , wherein the ethylene/α-olefin is a C 3 -C 20 olefin.
16 . The composition of claim 1 , wherein the high molecular weight ethylene polymer is present in an amount less than, or equal, to 20 weight percent, based on the total weight of the composition.
17 . The composition of claim 1 , wherein the composition has a density greater than, or equal to, 0.94 g/cm 3 .
18 . The composition of claim 1 , further comprising a low molecular weight ethylene polymer with a weight average molecular weight from 500 to 20,000 g/mole.
19 . The composition of claim 1 , wherein the composition has an extrudate swell, which is less than the extrudate swell of a composition that contains all of the same components, except the high molecular weight ethylene polymer.
20 . The composition of claim 19 , wherein the composition has an NCLS failure time, greater than the NCLS failure time of a composition that contains all of the same components, except the high molecular weight ethylene polymer.
21 . The composition of claim 18 , wherein the composition has an extrudate swell, which is less than the extrudate swell of a composition that contains all of the same components, except the high molecular weight ethylene polymer.
22 . The composition of claim 21 , wherein the composition has an NCLS failure time, greater than the NCLS failure time of a composition that contains all of the same components, except the high molecular weight ethylene polymer.
23 . The composition of claim 19 , wherein the composition has an extrudate swell that is 95 percent, or less, of the extrudate swell resulting from a composition that contains all of the same components, except the high molecular weight ethylene polymer.
24 . The composition of claim 21 , wherein the composition has an extrudate swell that is 95 percent, or less, of the extrudate swell resulting from a composition that contains all of the same components, except the high molecular weight ethylene polymer.
25 . The composition of claim 23 , wherein the composition has an NCLS failure time greater than 40 hours.
26 . The composition of claim 24 , wherein the composition has an NCLS failure time greater than 40 hours.
27 . A composition of claim 1 , wherein the high molecular weight ethylene polymer has a molecular weight ratio, Mz/Mw, from 1.2 to 5.
28 . The composition of claim 27 , wherein the high molecular weight ethylene polymer has a molecular weight distribution, Mw/Mn, from 1.2 to 5.
29 . A composition of claim 1 , wherein the high molecular weight ethylene polymer has long chain branching.
30 . The composition of claim 29 , wherein the high molecular weight ethylene polymer has a molecular weight distribution, Mw/Mn, less than 5.
31 . The composition of claim 29 , wherein the high molecular weight ethylene polymer has 0.01 to 1 long chain branches per 1000 carbon atoms.
32 . An article prepared from the composition of claim 1 .
33 . An article prepared from the composition of claim 27 .
34 . An article prepared from the composition of claim 29 .