Ethylene- alpha -olefin copolymer and molded article thereof

摘要

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>/=4.6-0.04xlogMFR(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 /SCBave(2)wherein sigma is a standard deviation of chemical composition distribution (1/1,000 C) and SCBave is the average of short chain branchings per 1,000 C (1/1,000 C), (D) a ratio of a weight average molecular weight Mw to a number average molecular weight Mn (Mw/Mn) is 3 to 20, and (F) a ratio (TVR) of trans-vinylene type carbon-carbon double bonds to total carbon-carbon double bonds as determined with an infrared absorption spectrum being 1 to 30%.