Claims
- 1. A catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound represented by the formula:
- 2. The catalyst system in accordance with claim 1 wherein the at least one bulky ligand is substituted with at least one alkyl having 3 or more carbon atoms.
- 3. The catalyst system in accordance with claim 1 wherein the substituent is selected from one or more of the group consisting of n-propyl, isopropyl, n-butyl, isobutyl and n-pentyl.
- 4. The catalyst system of claim 1 wherein d is 1, 2, 3 or 4, e is 2 and f is O.
- 5. A process for polymerizing olefin(s) in the presence of a catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound having at least one bulky ligand substituted with a substituent having 3 or more non-hydrogen atom, and an activator.
- 6. The process in accordance with claim 5 wherein the substituent has 3 or more carbon atoms.
- 7. The process in accordance with claim 6 wherein the substituent is selected from one or more of the group consisting of n-propyl, isopropyl, n-butyl, isobutyl and n-pentyl.
- 8. The process in accordance with claim 6 wherein the process is a gas phase process.
- 9. The process in accordance with claim 6 wherein the bulky ligand hafnium transition metal metallocene-type catalyst compound is bis(n-propyl-cyclopentadienyl) hafnium dichloride.
- 10. A continuous gas phase process for polymerizing olefin(s) in a fluidized bed gas phase reactor in the presence of a catalyst system to produce a polymer product, the catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound having at least one bulky ligand substituted with a substituent having 3 or more carbon atoms, and the polymer product comprising less than 5 ppm hafnium.
- 11. The process of claim 10 wherein the polymer product comprises less than 1 ppm hafnium.
- 12. The process in accordance with claim 10 wherein the substituent is an alkyl having 3 to 10 carbon atoms.
- 13. The process in accordance with claim 10 wherein the catalyst system is represented by the formula:
- 14. A continuous slurry phase process for polymerizing olefin(s) in the presence of a catalyst system to produce a polymer product in a liquid polymerization medium, the catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound having at least one bulky ligand substituted with a substituent having 3 or more carbon atoms, and the polymer product comprising less than 2 ppm hafnium.
- 15. A polymer produced with a hafnocene catalyst system, the polymer comprising ethylene and having a hafnium content in the range of 0.1 to 5 ppm.
- 16. The polymer in accordance with claim 15 wherein the polymer has a density greater than 0.910 g/cc.
- 17. The polymer in accordance with claim 15 wherein the polymer has a settled bulk density in the range of 15 to 30 lb/ft3 (240 to 481 kg/m3).
- 18. An ethylene based polymer produced by a catalyst system comprising a bulky ligand hafnium transition metal metallocene-type catalyst compound, wherein at least one bulky ligand is substituted with a substituent having 3 to 5 carbon atoms, the polymer having a settled bulk density in the range from 15 to 30 lb/ft3 (240 to 481 kg/m3), a Mw/Mn in the range of from 2 to 3, a density in the range of from 0.900 g/cc to greater than 0.97 g/cc and a hafnium content in the range of from 0.1 to 5 ppm.
- 19. A film layer comprising an ethylene-alpha-olefin polymer produced by polymerization of monomers of ethylene and an alpha-olefin with a catalyst having as a transition metal component a bis(n-C3-4 alkyl cyclopentadienyl) hafnium compound and a bis(n-C3-4 alkylcyclopentadienyl) zirconium compound and wherein said hafnium compound is 95 mole % to 99.9 mole % of said transition metal component and said ethylene-alpha-olefin polymer has an alpha-olefin content of from 1 to 5 mole %, a melt index (MI, g/10 min.) of 0.1 to 100, a melt index ratio (MIR) of 20 to 35, a weight average molecular weight (Mw) of 25,000 to 150,000, a molecular weight distribution (Mw/Mn) of 2.5 to 7, a Mz/Mw ratio of 2 to 3.5.
- 20. The film layer of claim 19 wherein said ethylene-alpha-olefin polymers is bimodal in respect to distribution of its alpha-olefin comonomer content as reflected by a temperature rising effluent fractionation (TREF) analysis of said ethylene-alpha-olefin polymer.
- 21. A film layer of claim 20, wherein said ethylene-alpha-olefin polymer has a MI of 2 to 4 and as a cast film layer, said film has a 1% secant modulus greater than 14.5 kpsi and less than 21 kpsi, a machine direction tear of greater than 100 g/mil and less than 600 g/mil, a transverse direction tear of greater than 100 g/mil and less than 1000 g/mil, a 26″ dart value greater than 100 g/mil and less than 1400 g/mil.
- 22. The film layer of claim 21, wherein said film layer has a machine direction tensile at break greater than 7 kpsi and less than 11 kpsi, a transverse direction tensile at break greater than 5 kpsi and less than 6.5 kpsi, a machine direction elongation at break greater than 325% and less than 600%, a transverse direction at break greater than 550% and less than 750%.
- 23. The film layer of claim 20, wherein said ethylene-alpha-olefin polymer has a MI of 0.5 to 2 and as a blown film layer said film has 1% secant modulus greater than 26 kpsi and less than 33 kpsi and a 26″ dart value greater than 900 g/mil.
- 24. The film layer of claim 20 wherein by TREF analysis the ethylene-alpha-olefin polymer is characterized by a low-temperature peak (LTP) in a region of 45 to 75° C. and a high-temperature peak (HTP) in the region of 70 to 95° C. and the LTP and HTP are separated by 20 to 35° C.
- 25. The film layer of claim 24 where the LTP fraction comprises 10 to 90 mole % of the ethylene-alpha-olefin polymer.
- 26. The film layer of claim 25 wherein the HTP fraction is 60-80 mole % of the ethylene-alpha-olefin polymer.
- 27. An ethylene-alpha-olefin polymer produced by polymerization of monomers of ethylene and an alpha-olefin with a catalyst having as a transition metal component a bis(n-C3-4 alkyl cyclopentadienyl) hafnium compound and a bis(n-C3-4 alkylcyclopentadienyl) zirconium compound and wherein said hafnium compound is 95 to 99.9 mole % of said transition metal component and said ethylene-alpha-olefin polymer has an alpha-olefin content of from 1 to 5 mole %, a density of at least 0.915 g/cc, a melt index (MI, g/10 min.) of 0.1 to 100, a melt index ratio (MIR) of 20 to 35, a weight average molecular weight (Mw) of 25,000 to 150,000, a molecular weight distribution (Mw/Mn) of 3 to 7, a Mz/Mw ratio of 2 to 3.5 and a content of Hf less than 5 ppm.
- 28. The ethylene-alpha-olefin polymers of claim 27 wherein said polymer is bimodal in respect to distribution of its alpha-olefin comonomer content as reflected by a temperature rising effluent fractionation (TREF) analysis of said ethylene-alpha-olefin polymer.
- 29. The ethylene-alpha-olefin polymer of claim 28, wherein by TREF analysis the ethylene-alpha-olefin polymer is characterized by a low-temperature peak (LTP) in a region of 45 to 75° C. and a high-temperature peak (HTP) in the region of 70 to 95° C. and the LTP and HTP are separated by 20 to 35° C.
- 30. The polymer of claim 29 where the LTP fraction comprises 10 to 90 mole % of the ethylene-alpha-olefin polymer.
- 31. The polymer of claim 29, wherein the HTP fraction is 60-80 mole % of the ethylene-alpha-olefin polymer.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation-in-part application of U.S. patent application Ser. No. 08/986,696 filed Dec. 8, 1997.
Divisions (1)
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Number |
Date |
Country |
Parent |
09207213 |
Dec 1998 |
US |
Child |
09805819 |
Mar 2001 |
US |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
08986696 |
Dec 1997 |
US |
Child |
09207213 |
Dec 1998 |
US |