Polyolefin resin blends for crack-resistant pipe

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United States of America Patent

PATENT NO 8475898
APP PUB NO 20090061135A1
SERIAL NO

11897438

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Resin blends useful for pipe and blow-molded articles are disclosed. The blends comprise a low-molecular-weight, high-density polyethylene and a high-molecular-weight, low-density ethylene copolymer. The high-molecular-weight component is made with a bridged indenoindolyl Group 4 metal complex having open architecture. Blends of the invention uniquely have high molecular weight (Mw>200,000) and low levels of long-chain branching. A quick, convenient approach for estimating levels of long-chain branching in polyethylenes from gel permeation chromatography and dynamic oscillatory rheometry (“viscosity enhancement factor”) is disclosed.

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Patent Owner(s)

  • EQUISTAR CHEMICALS, LP

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hlatky, Gregory G Morrow, US 33 2507
Joseph, Sebastian Mason, US 15 122
Klug, Kenneth J Cincinnati, US 5 46
Merrick-Mack, Jean A West Chester, US 14 182
Wang, Shaotian Mason, US 39 393
Yau, Wallace W Pearland, US 31 457

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