Polyethylene formulations for large part blow molding applications
In various embodiments, a polyethylene formulation has a density of greater than 0.940 g/cm 3 when measured according to ASTM D792, and a high load melt index (I 21 ) of 1.0 g/10 min to 10.0 g/10 min when measured according to ASTM D1238 at 190° C. and a 21.6 kg load. Moreover, the polyethylene formulation has a peak molecular weight (M p(GPC) ) of less than 50,000 g/mol, a number average molecular weight (M n(GPC) ) of less than 30,000 g/mol, and a weight fraction (w1) of molecular weight (MW) less than 10,000 g/mol of less than or equal to 10.5 wt %, as determined by Gel Permeation Chromatography (GPC). Articles made from the polyethylene formulation, such as articles made by blow molding processes are also provided.
1. A polyethylene formulation having a density of greater than 0.940 g/cm 3 when measured according to ASTM D792, a high load melt index (I 21 ) of 1 to 10 g/10 min when measured according to ASTM D1238 at 190° C. and a 21.6 kg load, a peak molecular weight (M p(GPC) ) of less than 50,000 g/mol, a number average molecular weight (M n(GPC) ) of less than 30,000 g/mol, and a weight fraction (w1) of molecular weight (MW) less than 10,000 g/mol of less than or equal to 10.5 wt %, as determined by Gel Permeation Chromatography (GPC).
2. The polyethylene formulation of claim 1 , wherein the peak molecular weight (M p(GPC) ) is less than 49,000 g/mol, as determined by Gel Permeation Chromatography (GPC).
3. The polyethylene formulation of claim 1 , wherein the weight fraction (w1) of molecular weight (MW) less than 10,000 g/mol is less than or equal to 10.0 wt %, as determined by Gel Permeation Chromatography (GPC).
4. The polyethylene formulation of claim 1 , wherein a weight fraction (w2) of molecular weight (MW) greater than 1,000,000 g/mol is greater than or equal to 9.0 wt %, as determined by Gel Permeation Chromatography (GPC).
5. The polyethylene formulation of claim 1 , wherein the polyethylene formulation has an I 21 /I 5 ratio of 15 to 35, wherein I 5 is measured according to ASTM D1238 at 190° C. and a 5.0 kg load.
6. The polyethylene formulation of claim 1 , wherein the polyethylene formulation has a complex shear viscosity at 100 rad/s and 190° C. of less than or equal to 3,500 Pa*s.
7. The polyethylene formulation of claim 1 , wherein the polyethylene formulation has a complex shear viscosity at 1 rad/s and 190° C. of greater than or equal to 45,000 Pa*s.
8. The polyethylene formulation of claim 1 , wherein the polyethylene formulation has a capillary swell (t1000) of greater than or equal to 7.5 seconds.
9. The polyethylene formulation of claim 1 , wherein the polyethylene formulation has an environmental stress crack resistance F 50 of greater than 150 hours when measured according to ASTM D1693, Procedure B, 10% Igepal.
10. An article manufactured using a polyethylene having a density of greater than 0.940 g/cm 3 when measured according to ASTM D792, a high load melt index (I 21 ) of 1 to 10 g/10 min when measured according to ASTM D1238 at 190° C. and a 21.6 kg load, a peak molecular weight (M p(GPC) ) of less than 50,000 g/mol, a number average molecular weight (M n(GPC) ) of less than 30,000 g/mol, and a weight fraction (w1) of molecular weight (MW) less than 10,000 g/mol of less than or equal to 10.5 wt %, as determined by Gel Permeation Chromatography (GPC).
11. The article of claim 10 , wherein the article is a blow molded article.
12. The article of claim 10 , wherein the peak molecular weight (M p(GPC) ) is less than 49,000 g/mol, as determined by Gel Permeation Chromatography (GPC).
13. The article of claim 10 , wherein the weight fraction (w1) of molecular weight (MW) less than 10,000 g/mol is less than or equal to 10.0 wt %, as determined by Gel Permeation Chromatography (GPC).
14. The article of claim 10 , wherein a weight fraction (w2) of molecular weight (MW) greater than 1,000,000 g/mol is greater than or equal to 9.0 wt %, as determined by Gel Permeation Chromatography (GPC).
15. The article of claim 10 , wherein the polyethylene formulation has an I 21 /I 5 ratio of 15 to 35, wherein I 5 is measured according to ASTM D1238 at 190° C. and a 5.0 kg load.
16. The article of claim 10 , wherein the polyethylene formulation has a complex shear viscosity at 100 rad/s and 190° C. of less than or equal to 3,500 Pa*s.
17. The article of claim 10 , wherein the polyethylene formulation has a complex shear viscosity at 1 rad/s and 190° C. of greater than or equal to 45,000 Pa*s.
18. The article of claim 10 , wherein the polyethylene formulation has a capillary swell (t1000) of greater than or equal to 7.5 seconds.
19. The article of claim 10 , wherein the polyethylene formulation has an environmental stress crack resistance F 50 of greater than 150 hours when measured according to ASTM D1693, Procedure B, 10% Igepal.