Polymer composition for pipes

Details Polymer composition for pipes Polymer composition for pipes

2005-04-12

2005-04-12

Harlan, Robert D. (Department: 1713)

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

Synthetic resins

Polymerizing in tubular or loop reactor

C526S065000, C526S348400, C526S348500, C526S348600, C526S352000, C526S901000, C526S905000, C428S036900, C428S036910, C428S036920

Reexamination Certificate

active

06878784

ABSTRACT:
A multimodal polymer composition for pipes is disclosed. The polymer is a multimodal polyethylene with a density of 0.930-0.965 g/cm3, an MFR5of 0.2-1.2 g/10 min, an Mnof 8000-15000, an Mwof 180-330×103, and an Mw/Mnof 20-35, said multimodal polyethylene comprising a low molecular weight (LMW) ethylene homopolymer fraction and a high molecular weight (HMW) ethylene copolymer fraction, said HMW fraction having a lower molecular weight limit of 3500, and a weight ratio of the LMW fraction to the HMW fraction of (35-55):(65:45).

REFERENCES:
patent: 5326835 (1994-07-01), Ahvenainen et al.
patent: 5494965 (1996-02-01), Harlin et al.
patent: 6403181 (2002-06-01), Barry et al.
patent: 0 517 868 (1995-11-01), None
patent: 0 688 794 (1995-12-01), None
patent: 0 949 274 (1999-10-01), None
patent: WO 9703124 (1997-01-01), None

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