Polyethylene pipe resins and production thereof

Details Polyethylene pipe resins and production thereof Polyethylene pipe resins and production thereof

2005-09-20

2005-09-20

Lu, Caixia (Department: 1713)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S240000

Reexamination Certificate

active

06946521

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 great 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: 4461873 (1984-07-01), Bailey et al.
patent: 5306775 (1994-04-01), Martin et al.
patent: 6346575 (2002-02-01), Debras et al.
patent: 6380311 (2002-04-01), Razavi et al.
patent: 0989141 (2000-03-01), None
patent: 1 359 192 (2003-05-01), None

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