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US 6,646,072 B2Granted
Process for making polyolefin compositions containing exfoliated clay
AssigneeEquistar Chemicals, LP
InventorsDouglas D. Klendworth, Mark K. Reinking
Life of this patent
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Abstract
A clay-filled polyolefin composition and process for making it are disclosed. The process involves treatment of a non-acid-treated smectite clay with a Ziegler-Natta catalyst in the presence of a hydrocarbon and subsequent polymerization of an olefin in the presence of the treated clay and an organoaluminum cocatalyst. Results indicate that filled compositions produced by this process contain exfoliated clay.
Claims17
A process for the preparation of exfoliated clay-filled polyolefins which comprises:
- (a) treating a non-acid-treated smectite clay with a Ziegler-Natta catalyst in the presence of a hydrocarbon;
- and
- (b) polymerizing an olefin in the presence of the treated clay and an organoaluminum cocatalyst wherein the organoaluminum cocatalyst is selected from the group consisting of trialkyl aluminums, triaryl aluminums, alkyl aluminum halides, alkyl aluminum dihalides, and mixtures thereof.
Dependencies are inferred from the claim text.