Process for producing an ethylenic polymer composition.

摘要

There is disclosed a process for producing an ethylenic polymer composition having a density of 0.94 to 0.97 g/cm<3> and an intrinsic viscosity [ eta ] of 1.5 to 6 dl/g which comprises the multistage polymerization steps of polymerizing ethlene or copolymerizing ethylene and other olefinic comonomer to form 30 to 70 wt% of (1) an ethylenic polymer having a density of 0.940 g/cm<3> or higher and an intrinsic viscosity [ eta ] of 0.5 to 1.5 dl/g by the use of a catalyst comprising, as principal components, a transition metal compound, a compound capable of reacting with a transition metal compound to form an ionic complex and an organoaluminum compound; and copolymerizing ethylene and other olefinic comonomer to form 70 to 30 wt% of (2) an ethylenic polymer having a density not higher than that of the ethylenic polymer (1) and an intrinsic viscosity [ eta ] higher than that of the ethylenic polymer (1) by the use of the same catalyst. The obtained composition is excellent in ESCR, minimized in low melting component causing gum or burned spot and excellent in the appearance when made into a molding.