| 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 [ eta ] is from 0.8 to 10 dl/g, (3) in the steric pentad fraction as determined by <1><3>C-NMR, the [mmmm] fraction is from 0.45 to 0.85, (4) the melt flow ratio (MFR) satisfies the following equation: MFR >/= -42 log MI + 133, wherein MI means melt index, (5) the fusion temperature is from 154 to 164 DEG C, (6) the heat of fusion is from 5 to 22 cal/g, (7) the intrinsic viscosity [ eta ]HSP of the boiling-heptane soluble portion (HSP) and the intrinsic viscosity [ eta ]HIP of the boiling-heptane insoluble portion (HIP) of said polymer satisfies the following equation: [ eta ]HSP>/= 0.25 [ eta ]HIP, and (8) in the steric pentad fraction of the above boiling-heptane insoluble portion as determined by <1><3>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. |
