Homogeneous filled polymer composite
AssigneeThe Dow Chemical Company
InventorsMiguel García Martí, Michael Alexandre, Philippe G. Dubois, Robert J. E. G. Jér ;me, François J. Hindryckx
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Abstract
The present invention relates to a process for preparing a filled polymer composite comprising from 1 to 98 percent by weight of an interpolymer and from 2 to 99 percent by weight of a filler, said process comprising copolymerization in the presence of a cyclopentadienyl-containing transition metal catalyst and a filler, said filler having immobilized thereon a suitable cocatalyst.
Claims11
A process for the preparation of a filled polymer composite comprising 1 to 98 percent by weight of an interpolymer and 2 to 99 percent by weight of a filler, said process comprising
- polymerizing ethylene or propylene and at least one comonomer in the presence of a cyclopentadienyl-containing transition metal catalyst and a filler having immobilized thereon an aluminoxane, or a mixture of aluminoxanes,
- the immobilization of the aluminoxane, which takes place prior to copolymerization, comprising subjecting the cocatalyst treated filler to a heat treatment at a temperature in the range of from 50° C. to 250° C.,
- in which filler the aluminum present in the aluminoxane is not more than 10 percent by weight extractable in a one-hour extraction with toluene at a temperature of 90° C., using 10 mL toluene per gram of treated filler,
- under conditions to allow copolymerization of ethylene or propylene and at least one comonomer to form said composite.
Dependencies are inferred from the claim text.