Monoolefin catalysts and method for the preparation thereof
AssigneeThe Standard Oil Company
InventorsFrederick W. Haas, William J. Miloscia
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Abstract
The invention herein is directed toward a method for forming a coating on the surface of a catalyst and includes the steps of dissolving a membrane forming compound in a hdyrocarbon solvent, adding the catalyst to the solvent and agitating to form a mixture and finally drying the mixture to form particles of the catalyst having a coating of the membrane forming compound. Particularly suitable for the polymerization of monoolefins are Ziegler-Natta catalyts which can be coated according to the foregoing method. The compounds forming the coating include the silicone greases obtained by mixing a filler material with a dimethylpolysiloxane fluid.
Claims8
A method for forming a coating on the surface of Ziegler-Natta catalysts for the polymerization of monoolefins comprising the steps of:
- dissolving a membrane forming compound, selected from the group consisting of silicones, tetraalkyl silicons, silicon alkyl halides and silicon alkyl hydrides, in a hydrocarbon solvent;
- adding the Ziegler-Natta catalyst to said hydrocarbon solvent and agitating to form a mixture;
- and,
- drying said mixture to form particles of the catalyst having a coating of said membrane forming compound.
A Ziegler-Natta catalyst for the polymerization of monoolefins the improvement wherein the catalyst particles are provided with a coating comprising a membrane forming compound selected from the group consisting of silicones, tetraalkyl silicons, silicon alkyl halides and silicon alkyl hydrides.
Dependencies are inferred from the claim text.