Ethylene-α-olefin copolymer, resin composition...

Details Ethylene-α-olefin copolymer, resin composition... Ethylene-α-olefin copolymer, resin composition...

2006-09-28

2011-10-18

Jagannathan, Vasu (Department: 1764)

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

Synthetic resins

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

C525S191000, C526S348000, C526S352000, C526S352200

Reexamination Certificate

active

08039554

ABSTRACT:
An ethylene-α-olefin copolymer having monomer units derived from ethylene and monomer units derived from an α-olefin of 3 to 20 carbon atoms, a melt flow rate (MFR) of 0.01 to 4 g/10 minutes, a density of 890 to 970 kg/m3, an activation energy of flow of 50 kJ/mol or more and a molecular weight distribution measured by gel permeation chromatography of 3 or more, wherein a characteristic relaxation time (τ) determined by a melt viscoelasticity measurement or an external haze ratio (EHR) satisfies a relationship of the following formula (1) or (2), respectively:in-line-formulae description="In-line Formulae" end="lead"?3×MFR−0.75+1.1>τ>1.3×MFR−0.5+1.4  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?EHR≦−15×log MFR+0.145×d−47  (2)in-line-formulae description="In-line Formulae" end="tail"?

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patent: 2004/0030082 (2004-02-01), Iseki
patent: 2005/0192417 (2005-09-01), Iseki et al.

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