Claims
- 1. A process for polymerizing 1-olefins, which process comprises contacting 1-olefin monomer with a catalytically effective amount of a catalyst composition comprising the reaction product of a pi-bonded organochromium [II] compound and a crystalline aluminosilicate zeolite having a silica to alumina molar ratio of at least about 12 and a Constraint Index in the approximate range of about 1 to 12, under polymerization conditions which include a temperature and pressure suitable for initiating and promoting the polymerization reaction.
- 2. A process according to claim 1 wherein said catalyst composition reaction product is formed in a reaction medium comprising a solvent maintained at a temperature from about -80.degree. C. to 100.degree. C. for a period for about 0.1 to 10 hours.
- 3. A process according to claim 2 wherein said reaction medium is also the medium which polymerization occurs and wherein said reaction medium solvent is selected from alkanes, cycloalkanes, aromatic hydrocarbons, halogenated hydrocarbons and ethers.
- 4. A process according to claim 3 wherein said reaction medium contains 0.1 to 10 parts by weight of said organochromium compound per 100 parts by weight of said zeolite.
- 5. A process according to claim 4 wherein said organochromium compound is selected from fused ring bis-(idenyl)-and bis(fluorenyl)-chromium [II] compounds and chromocene compounds.
- 6. A process according to claim 5 wherein said zeolite is selected from ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
- 7. A process according to claim 6 wherein said organochromium compound is di(cyclopentadienyl) chromium.
- 8. A process according to claim 7 wherein said zeolite is ZSM-5.
- 9. A process according to claim 1 or 6 wherein said catalyst composition further comprises a catalyst binder.
- 10. A process according to claim 9 wherein said olefin monomer is ethylene.
- 11. A process according to claim 9 wherein said polymerization reaction conditions include a temperature from about 30.degree. C. to 200.degree. C. and a pressure from about 0 to 1000 psig.
- 12. A process according to claim 11 wherein the polymerization reaction is conducted with reactants in the liquid phase and in the presence of an inert organic solvent.
- 13. A process according to claim 11 whaerein the polymerization reaction is conducted with the reactants in the vapor phase.
- 14. A process according to claim 13 wherein the vapor phase polymerization reaction is conducted with the catalyst in a fluidized bed.
Parent Case Info
This is a division of copending application Ser. No. 305,233, filed Sept. 24, 1981, now U.S. Pat. No. 4,377,497.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
305233 |
Sep 1981 |
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