Polyethylene pipe having better melt processibility and high...

Details Polyethylene pipe having better melt processibility and high... Polyethylene pipe having better melt processibility and high...

2007-12-04

2007-12-04

Rabago, Roberto (Department: 1713)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S113000, C526S114000, C526S118000, C526S119000, C526S348000, C526S348200, C526S348400, C526S348600, C526S160000, C525S240000

Reexamination Certificate

active

11100659

ABSTRACT:
An ethylene-based copolymer for non-crosslinked water supply pipe is provided. The ethylene-based copolymer is prepared using a supported hybrid metallocene catalyst and has a dimodal or broad molecular weight distribution. The ethylene-based copolymer has a high density molecular structure in a low molecular weight and has a low density molecular structure with high content of a comonomer in a high molecular weight. The ethylene-based copolymer has a molecular weight distribution of 5-30 and the distribution of copolymerization of ethylene and C3-20α-olefin is localized in high molecular weight chains. Accordingly, the ethylene-based copolymer has superior processability, internal pressure creep resistance at high temperatures and environmental stress crack resistance.

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