US Patent 7563849 Ethylene (co) polymer and its use
Patent 7563849 was granted and assigned to Mitsui Chemicals on July, 2009 by the United States Patent and Trademark Office.
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An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an α-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9−7.15×SR; and the intrinsic viscosity ([η]) and the melt flow rate (MFR) satisfy the relation; [η]>1.85×MFR−0.192 in the case of MFR<1 and the relation; [η]>1.85×MFR−0.213 in the case of MFR≧1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.
US Patent 07563849 Ethylene (co) polymer and its use US Patent 7563849 Ethylene (co) polymer and its use
US Patent 07563849 Ethylene (co) polymer and its use
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