High-density polyethylene compositions and method of making...

Details High-density polyethylene compositions and method of making... High-density polyethylene compositions and method of making...

2006-05-23

2008-11-25

Lipman, Bernard (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S348200, C526S348300, C526S348400, C526S348500, C526S348600, C526S348700

Reexamination Certificate

active

07456244

ABSTRACT:
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/cm3, a melt index (I2) in the range of 30 to 75 g/10 minutes, an I21/I2ratio in the range of 13-35, a Mw/Mnratio 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/cm3, a melt index (I2) in the range of 30 to 75 g/10 minutes, an I21/I2ratio 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.

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