Method for preparing copolymers
AssigneeIneos Europe AG
InventorsSergio Mastroianni, Stefan Klaus Spitzmesser
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Abstract
A method for the preparation of copolymers of ethylene and α-olefins having a fraction (%) of the molecular weight component of >1,000,000 of less than 6% comprises polymerising ethylene and an α-olefin in the presence of a supported polymerisation catalyst system comprising (a) a transition metal compound (b) a porous support material, and (c) an activator characterized in that the support material has been (i) dried at a temperature in the range 0° C. to 195° C. in an inert atmosphere, and (ii) treated with an organometallic compound. The resultant supported catalyst systems show improved productivity and allow for control of the resultant polymer properties. Particularly preferred supported catalyst systems are those comprising metallocene complexes.
Claims17
A method for the preparation of copolymers of ethylene and α-olefins having a fraction (%) of the molecular weight component of >1,000,000 of less than 6% said method comprising polymerising ethylene and an α-olefin in the presence of a supported polymerisation catalyst system comprising
- (a) a transition metal compound,
- (b) a porous support material, and
- (c) an activator,
- characterized in that the support material has been
- (i) dried at a temperature in the range 0° C. to 195° C. in an inert atmosphere, and
- (ii) treated with an organometallic compound.
Dependencies are inferred from the claim text.