High-density polyethylene compositions and method of making the same
The instant invention is a high-density polyethylene composition, and method of making the same. The high-density polyethylene composition of the instant invention includes an ethylene alpha-olefin copolymer having a density in the range of 0.935 to 0.952 g/cm 3 , a melt index (I 2 ) in the range of 30 to 75 g/10 minutes, an I 21 /I 2 ratio in the range of 13-35, a M w /M n ratio in the range of 3.5-8. The high-density polyethylene composition has a brittleness temperature of at least less than −20° C. The process for producing a high-density polyethylene composition according to instant invention includes the following steps: (1) introducing ethylene, and an alpha-olefin comonomer into a reactor; (2) copolymerizing the ethylene with the alpha-olefin comonomer in the reactor; and (3) thereby producing the high-density polyethylene composition, wherein the high-density polyethylene composition having a density in the range of 0.935 to 0.952 g/cm 3 , a melt index (I 2 ) in the range of 30 to 75 g/10 minutes, an I 21 /I 2 ratio in the range of 13-35, a M w /Mn ratio in the range of 3.5-8, and a brittleness temperature of at least less than −20° C.
1. A high-density polyethylene composition comprising:
an ethylene alpha-olefin copolymer consisting essentially of the copolymerization product of ethylene and one or more alpha-olefins having a density in the range of 0.935 to 0.952 g/cm 3 , a melt index (I 2 ) in the range of 30 to 75 g/10 minutes, an I 21 /I 2 ratio in the range of 13-35, a M w /M n ratio in the range of 3.5-8;
wherein said high-density polyethylene composition has a brittleness temperature of at least less than −20° C.
2. The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition has a brittleness temperature of at least less than −45° C.
3. The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition has an IDI impact in peak energy of >26.5 inch lbs and in total energy of >31.5 inch lbs at −40° C.
4. The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition provides an improved total energy absorbed on impact at a temperature of at least less than −20° C.
5. An article comprising:
a high-density polyethylene composition comprising;
an ethylene alpha-olefin copolymer essentially consisting of the copolymerization product of ethylene and one or more alpha-olefins has a density in the range of 0.935 to 0.952 g/cm 3 , a melt index (I 2 ) in the range of 30 to 75 g/10 minutes, an I 21/I 2 ratio in the range of 13-35, a M w /M n ratio in the range of 3.5-8;
wherein said high-density polyethylene composition has a brittleness temperature of at least less than −20° C.
6. The article according to claim 5 , wherein said article is an injection molded article.
7. The article according to claim 6 , wherein said injection molded article is used as a food container or a non-food container.
8. A process for making an article comprising the steps of:
providing a high-density polyethylene composition comprising an ethylene alpha-olefin copolymer essentially consisting of the copolymerization product of ethylene and one or more alpha-olefins having a density in the range of 0.935 to 0.952 g/cm 3 , a melt index (I 2 ) in the range of 30 to 75 g/10 minutes, an I 21 /I 2 ratio in the range of 13-35, a M w /M n ratio in the range of 3.5-8, and wherein said high-density polyethylene composition has a brittleness temperature of at least less than −20° C.;
injection molding said high-density polyethylene composition into said article.
9. The process for making an article according to claim 8 , wherein said high-density polyethylene composition has a brittleness temperature of at least less than −45° C.
10. The process for making an article according to claim 8 , wherein said high-density polyethylene composition provides an improved total energy absorbed on impact at a temperature of at least less than −20° C.
11. The process for making an article according to claim 8 , wherein said high-density polyethylene composition provides an IDI impact in peak energy of >26.5 inch lbs and in total energy of >31.5 inch lbs at −40° C.