| 摘要 |
In a process for the production of a chemically blended composition of non-elastomeric ethylene resins in a multiplicity of steps in the presence of a catalyst composed of a transition metal catalyst component and an organometallic compound, which comprises (a) a step of forming (i) an ethylene polymer or an ethylene/alpha-olefin copolymer having an alpha-olefin content of up to 15% by weight, said polymer or copolymer (i) having an intrinsic viscosity [ eta ] of 0.3 to 3, and (b) a step of forming (ii) an ethylene/alpha-olefin copolymer having an alpha-olefin content of 0.2 to 30% by weight which is more than that of the polymer or copolymer (i), said copolymer (ii) having an intrinsic viscosity [ eta ] of 1 to 12 which is at least 1.5 times that of the polymer or copolymer (i), said step (a) being performed first and then step (b) being performed in the presence of the product of step (a), or step (b) being performed first and then step (a) being performed in the presence of the product of step (b), the improvement wherein in steps (a) and (b), ethylene is polymerized or copolymerized with the alpha-olefin (1) in the presence of a catalyst composed of (A) a highly active titanium catalyst component containing titanium, magnesium and halogen and being capable of yielding an ethylene polymer in an amount of at least 250 g/millimole of a titanium atom.hr.kg/cm2 of ethylene pressure and (b) an organoaluminum compound, (2) so that the weight ratio of the polymer or copolymer (i) formed in step (a) to the copolymer (ii) formed in step (b) is (30-less than 60):(above 40-70), and (3) so that the resulting chemically blended composition has an intrinsic viscosity [ eta ] of 1 to 6 and an alpha-olefin content of 0.2 to 20% by weight.
|
