Polyethylene pipe fitting resins

Details Polyethylene pipe fitting resins Polyethylene pipe fitting resins

2009-11-10

2010-10-12

Harlan, Robert D. (Department: 1796)

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

Synthetic resins

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

C526S351000, C526S352000

Reexamination Certificate

active

07812095

ABSTRACT:
A polyethylene resin suitable for formation into pipes or pipe fittings is disclosed, having an MI5 of from 0.40 to 0.70 g/10 min, and comprising from 47 to 52 wt % of a low molecular weight polyethylene fraction, and from 48 to 53 wt % of a high molecular weight polyethylene fraction, wherein the high molecular weight polyethylene fraction comprises a copolymer of ethylene and 1-hexen or 1-octene.

REFERENCES:
patent: 1 359 191 (2003-11-01), None
patent: WO 00/60001 (2000-10-01), None
patent: WO 02/102891 (2002-12-01), None

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