Process for producing polyethylene pipe resins

Details Process for producing polyethylene pipe resins Process for producing polyethylene pipe resins

2006-10-31

2006-10-31

Lu, Caixia (Department: 1713)

Static structures (e.g., buildings)

Stepped; e.g., stair

Risers connected to common stringer

C525S240000, C525S053000, C526S160000, C526S165000, C526S065000

Reexamination Certificate

active

07127853

ABSTRACT:
A polyethylene resin comprising from 35 to 49 wt. % of a first polyethylene fraction of high molecular weight and from 51 to 65 wt. % of a second polyethylene fraction of low molecular weight, the first polyethylene having a density of up to 0.930 g/cm3, and an HLMI of less than 0.6 g/10 min and the second polyethylene fraction comprising a high density polyethylene having a density of at least 0.969 g/cm3and an MI2of greater than 10 g/10 min, and the polyethylene resin, having a density of greater than 0.946 g/cm3, an HLMI of from 1 to 100 g/10 min, a dynamical viscosity, measured at 0.01 radians/second, greater than 200,000 Pa·s and a ratio of the dynamical viscosities measured at, respectively 0.01 and 1 radians/second greater than 8.

REFERENCES:
patent: 6346575 (2002-02-01), Debras et al.

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