Claims
- 1. A process for polymerizing at least one olefin having 2 to 8 carbon atoms per molecule which comprises contacting said olefin under polymerization conditions with a catalyst system which was produced by the process comprising:
- (a) contacting a ribbon-like clay selected from the group consisting of sepiolites having a surface area in the range of about 125 to about 215M.sup.2 /g and a pore volume in the range of about 0.35 to about 0.70 cm.sup.3 /g and palygorskites having a surface area in the range of about 110 to about 140M.sup.2 /g and a pore volume in the range of about 0.50 to about 0.70 cm.sup.3 /g, with a chromium solution having a chromium content in the range of about 0.001 g/ml to about 0.01 g/ml and a pH in the range of about 1.5 to about 2.5 thereby preparing a first product;
- (b) heating said first product at a temperature in the range of about 150.degree. C. to about 550.degree. C. and for a time period in the range of about 30 minutes to about 10 hours in an inert atmosphere;
- (c) thereafter continuing heating said first product at a temperature in the range of about 500.degree. C. to about 900.degree. C. and for a time period in the range of about 1 hour to about 50 hours in an oxidizing atmosphere.
- 2. A product produced by the process of claim 1.
- 3. A process according to claim 1 wherein said olefin is selected from the group consisting of ethylene, propylene, 1-pentene, 1-hexene, and 1-octene.
- 4. A process according to claim 1 wherein said olefin is predominantly ethylene.
- 5. A process according to claim 4 wherein a comonomer having from about 3 to about 8 carbon atoms per molecule is copolymerized with ethylene to form an ethylene copolymer.
- 6. A process according to claim 4 wherein said comonomer is selected from the group consisting of propylene, 1-butene, 1-pentene, 1-hexene, and 1-octene.
- 7. A process according to claim 6 wherein said comonomer is 1-hexene.
- 8. A process according to claim 1 further comprising combining said catalyst system with an organo-metal cocatalyst.
- 9. A process according to claim 8 further comprising a cocatalyst selected from the group consisting of: triethylaluminum, triethylboron, and diethylsilane.
- 10. A process according to claim 8 wherein said cocatalyst is triethylaluminum.
Parent Case Info
This application is a divisional of application Ser. No. 08/059,228, filed May 6, 1993, now U.S. Pat. No. 5,376,611, which is a continuation-in-part of application Ser. No. 07/803,857, filed Dec. 9, 1991, now abandoned.
US Referenced Citations (11)
Divisions (1)
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Number |
Date |
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Parent |
59228 |
May 1993 |
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Continuation in Parts (1)
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803857 |
Dec 1991 |
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