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1. WO2007140114 - HIGH-DENSITY POLYETHYLENE COMPOSITIONS AND METHOD OF MAKING THE SAME

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[ EN ]

WE CLAIM:

1. A high-density polyethylene composition comprising:
a high molecular weight ethylene alpha-olefϊn copolymer having a density in the range of 0.935 to 0.952 g/cm3, a melt index (I2) in the range of 30 to 75 g/10 minutes, an hι/h ratio in the range of 13-35, a Mw/Mn ratio in the range of 3.5-8;
wherein said high-density polyethylene composition having a brittleness temperature of at least less than -20 °C.

2. The high-density polyethylene composition according to Claim 1, where in said high-density polyethylene composition having a brittleness temperature of at least less than -45 °C.

3. The high-density polyethylene composition according to Claim 1, where in said high-density polyethylene composition having 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, where in said high-density polyethylene composition being adapted to provide an improved total energy absorbed on impact at a temperature of at least less than -20 °C.

5. A process for producing a high-density polyethylene composition comprising the steps of:
introducing ethylene, and an alpha-olefin comonomer into a reactor;
copolymerizing said ethylene with said alpha-olefin comonomer in said reactor
thereby producing said high-density polyethylene composition, wherein said high- density polyethylene composition having a density in the range of 0.935 to 0.952 g/cm3, a melt index (I2) in the range of 30 to 75 g/10 minutes, an I21/I2 ratio in the range of 13-35, a Mw/Mn ratio in the range of 3.5-8, and a brittleness temperature of at least less than -20° C.

6. The process producing a high-density polyethylene composition according Claim 5, wherein said reactor being a gas phase reactor.

7. The process producing a high-density polyethylene composition according Claim 5, wherein said high-density polyethylene composition having a brittleness temperature of at least less than -45 °C.

8. The process producing a high-density polyethylene composition according Claim 5, wherein said high-density polyethylene composition being adapted to provide an improved total energy absorbed on impact at a temperature of at least less than -20 °C.

9. The process producing a high-density polyethylene composition according Claim 5, wherein said high-density polyethylene composition having an IDI impact in peak energy of >26.5 inch lbs and in total energy of > 31.5 inch lbs at -40 °C.

10. An article comprising:
a high-density polyethylene composition comprising;
a high molecular weight ethylene alpha-olefin copolymer having a density in the range of 0.935 to 0.952 g/cm3, a melt index (I2) in the range of 30 to 75 g/10 minutes, an I21 /I2 ratio in the range of 13-35, a Mw/Mn ratio in the range of 3.5-8;
wherein said high-density polyethylene composition having a brittleness temperature of at least less than -20 °C.

11. The article according to Claim 10, wherein said article being an injection molded article.

12. The article according to Claim 11, wherein said injection molded article being used as a food container or a non-food container.

13. A process for making an article comprising the steps of: providing a high-density polyethylene composition having a density in the range of 0.935 to 0.952 g/cm3, a melt index (I2) in the range of 30 to 75 g/10 minutes, an I21/I2 ratio in the range of 13-35, a Mw/Mn ratio in the range of 3.5-8, and a brittleness temperature of at least less than -20 °C;
injection molding said high-density polyethylene composition into said article.

14. The process for making an article according to Claim 13, wherein said high-density polyethylene composition having a brittleness temperature of at least less than -45 "C.

15. The process for making an article according to Claim 13, wherein said high-density polyethylene composition being adapted to provide an improved total energy absorbed on impact at a temperature of at least less than -20 °C.

16. The process for making an article according to Claim 13, wherein said high-density polyethylene composition being adapted to provide an IDI impact in peak energy of >26.5 inch lbs and in total energy of > 31.5 inch lbs at -40 °C.