Ethylene-.alpha.-olefin copolymer and molded article thereof

Details Ethylene-.alpha.-olefin copolymer and molded article thereof Ethylene-.alpha.-olefin copolymer and molded article thereof

C - Chemistry, Metallurgy

08

F

C08F 210/16 (2006.01)

Patent

CA 2130502

A novel ethylene-.alpha.-olefin copolymer and a molded article formed therefrom, wherein (A) a density is 0.870 to 0.945 g/cm3, (B) a relation between an activation energy of flow Ea (J/mole K) obtained by measurement of viscoelasticity at at least three temperatures in the molten state and a melt flow rate MFR (g/10 min) satisfies the following equation (1): logEa ~ 4.6 - 0.04 × logMFR (1), (C) a coefficient Cx of variation of chemical composition distribution represented by the following equation (2) is 0.40 to 0.80: Cx = .sigma./SCB ave (2) wherein .sigma. is a standard deviation of chemical composition distribution (1/1,000 C) and SCB ave is the average of short chain branchings per 1,000 C (1/1,000 C), and (D) a ratio of a weight average molecular weight Mw to a number average molecular weight Mn (Mw/Mn) is 3 to 20.

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