摘要:
A flexible propylene polymer which is a propylene polymer obtained by gas-phase polymerization, said polymer being in particle form after polymerization and having a bulk density of at least 0.27 g/ml, wherein
(1) the ratio of weight average molecular weight to number average molecular weight is from 10 to 100, (2) the intrinsic viscosity [η] is from 0.8 to 10 dl/g, (3) in the steric pentad fraction as determined by 13 C-NMR, the [mmmm] fraction is from 0.45 to 0.85, (4) the melt flow ratio (MFR) satisfies the following equation: wherein MI means melt index, (5) the fusion temperature is from 154 to 164°C, (6) the heat of fusion is from 5 to 22 cal/g, (7) the intrinsic viscosity [η] HSP of the boiling-heptane soluble portion (HSP) and the intrinsic viscosity [η] HIP of the boiling-heptane insoluble portion (HIP) of said polymer satisfies the following equation: [η]HSP≧ 0.25 [η] HIP , and (8) in the steric pentad fraction of the above boiling-heptane insoluble portion as determined by "C-NMR, the [mmmm] fraction is from 0.60 to 0.90 and the sum of the [mmmr], [rrrm] and [rrrr] fractions is from 0.07 to 0.30.
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.
摘要:
A solid catalyst component for olefin polymenzanon which is produced by reacting (A) a silicon compound with (B) a compound of transition metal of Groups IVa, Va and Via of the periodic table to obtain a reaction mixture (I), reacting the reaction mixture (I) with (C) an organomagnesium compound selected from organomagnesium compounds or hydrocarbon-soluble complexes between an organomagnesium compound and an organometal compound capable of allowing said organomagnesium compound to be soluble in hydrocarbons to obtain an intermediate product (II), and contacting the intermediate product (II) with (D) an organoaluminum halide compound represented by the general formula R 1 c AlX 3-c (wherein R 1 is an organic group containing 1 to 20 carbon atoms, X is a halogen and c is a number defined by 0