Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1977-01-05
1978-12-05
Holler, Alan
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
C08F29708
Patent
active
041286065
ABSTRACT:
An improved process for preparing an impact-resistant chemically blended propylene polymer or copolymer, which comprises the following three steps:
(1) a first step of polymerizing propylene containing 0 to 1 mole% of another olefin in the presence of a catalyst composed of (a) a carrier-supported titanium catalyst component containing at least magnesium, halogen and titanium on the surface of the carrier and (b) an organo aluminum compound to form specific crystalline polypropylene;
(2) a second step of copolymerizing propylene and ethylene in the presence of the reaction product of the first step and the same catalyst while maintaining the content of propylene in the gaseous phase of the polymerization zone at 65 to 90 mole% thereby to form specific low-crystalline propylene/ethylene copolymer; and
(3) a third step of polymerizing ethlene, or both ethylene and propylene in the presence of the reaction product of the second step and the same catalyst while maintaining the content of propylene in the gaseous phase of the polymerization zone at 0 to 15 mole% thereby to form specific polyethylene or ethylene/propylene copolymer.
REFERENCES:
patent: 3642746 (1972-02-01), Kashiwa et al.
patent: 3974236 (1976-08-01), Koga et al.
patent: 3998911 (1976-12-01), Strametz et al.
Arita Shunji
Furutachi Kunio
Kato Akifumi
Nakagawa Mikio
Nakano Masaru
Holler Alan
Mitsui Petrochemical Industries Ltd.
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