C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/6578
C08F 297/08 (2006.01) C08F 255/00 (2006.01)
Patent
CA 1139488
Abstract of the Disclosure This invention relates to an improved process for production of a chemically blended composition of non-elastomeric ethylene resins. Thus the invention provides: in a process for the production of a chemically blended com- position 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 ethyl- ene polymer or an ethylene/alpha-olefin copolymer having an alpha-olefin con- tent of up to 15% by weight, said polymer or copolymer (i) having an intrinsic viscosity (n) 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 (n) 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/milli- mole 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 ill 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 intri- sic viscosity (n) of 1 to 6 and an alpha-olefin content of 0.2 to 20% by weight.
356263
Kashiwa Norio
Morita Yoshinori
Mitsui Chemicals Inc.
Smart & Biggar
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