| 摘要 |
PURPOSE: To produce an ethylenic polymer having high rigidity and high environmental crack resistance. CONSTITUTION: In a reaction zone, ethylene alone is polymerized in the presence of a catalyst system comprising a solid catalyst component containing Mg, Ti and a halogen and an organic aluminum compound to produce a polymer A having an intrinsic viscosity [η]A of 0.6-0.8 and an Mw/Mn of >=15 in an amount of 70-80wt.% based on the whole production amount of all the polymers. In the other reaction zone, ethylene alone or the ethylene and anα-olefin are polymerized to produce a polymer B having anα-olefin content of <=5wt.% and an intrinsic viscosity [η]B of 4-8.2 in an amount of 20-30wt.% based on the whole amount of all the polymers. The intrinsic viscosity ratio [η]B/[η]A of the polymers B/A is >=7.5, and the density of the finally produced polymer is 0.965-0.970. |
