Process for preparing low density ethylene copolymers

Details Process for preparing low density ethylene copolymers Process for preparing low density ethylene copolymers

C - Chemistry, Metallurgy

08

F

402/611, 402/645

C08F 2/06 (2006.01) C08F 4/64 (2006.01) C08F 10/00 (2006.01)

Patent

CA 1116795

ABSTRACT OF THE DISCLOSURE A process for producing an ethylene copolymer having a density of from 0.900 to 0.945 g/cm3 by copolymerizing in two steps a predominant amount of ethylene with a minor amount of an alpha-olefin containing at least 3 car- bon atoms at room temperature to not more than about 100°C under a pressure of about 1 to about 100 kg/cm2 in the presence of a catalyst composed of (A) a titanium catalyst component supported on a magnesium compound and (B) an organoaluminum compound; characterized in that said copolymerization is car- ried out in (i) a first step where about 0.01 to abut 50 g, per gram of the titanium catalyst component (A), of the alpha-olefin containing at least 3 carbon atoms is polymerized, said catalyst further comprising an organic acid ester (C), and then (ii) a second step where the final product of ethyleue copolymer is formed in an amount more than about 100 times the weight of the polymer formed in the first step.

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