摘要:
Disclosed are a polypropylene for use in production of a biaxially oriented film, said polypropylene being obtained by carrying out polymerization by the use of an olefin-polymerizing catalyst consisting of: (A) a solid catalyst component containing magnesium, titanium, halogen and electron donative compound as essential components, (B) an organoaluminum compound, and (C) at least two electron donative compounds including electron donative compound (α) and electron donative compound (β), provided that the pentad stereoirregularity index (mmrr/mmmm) of 105°C xylene-insoluble fraction of a homopolypropyelene obtained by carrying out polymerization by the use of electron donative compound (α) together with the above-mentioned solid catalyst component (A) and organoaluminum compound (B) satisfies the following condition:0 ≤ mmrr/mmmm ≤ 0.0068 and the pentad stereoirregularity index (mmrr/mmmm) of 105°C xylene-insoluble fraction of a homopolypropylene obtained by carrying out polymerization by the use of electron donative compound (β) together with the above-mentioned solid catalyst component (A) and organoaluminum compound (B) satisfies the following condition:0.0068
摘要:
A novel ethylene-α-olefin copolymer and a molded article formed therefrom, wherein
(A) a density is 0.870 to 0.945 g/cm 3, (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 (C) a coefficient Cx of variation of chemical composition distribution represented by the following equation (2) is 0.40 to 0.80: Cx = σ/SCB ave wherein σ 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.
(A) a density (p) of from 0.870 to 0.945 g/cm 3 , (B) a ratio (TVR) of trans-vinylene type carbon-carbon double bonds to total cabon-carbon double bonds as determined with an infrared absorption spectrum being 35% or more, and (C) a weight average molecular weight (Mw) of from 3.0 x 10 4 to 6.0 x 10 5 , and a molded article comprising thereof. The present invention provides an ethylene-α-olefin copolymer and a molded article comprising thereof having an excellent transparency, high gloss and high melt tension.