초록

This invention is generally directed toward a supported catalyst system useful for polymerizing olefins. The method for supporting the catalyst of the invention provides for a supported metallocene catalyst formed by vacuum or pressurized impregnation.

대표청구항 ▼

1. A process of polymerizing olefins alone or in combination with one or more other olefins, the process comprising polymerizing in the presence of a supported catalyst system formed by the steps of: a) introducing a porous inorganic carrier to a vessel having a starting pressure; b) depressuri

1. A process of polymerizing olefins alone or in combination with one or more other olefins, the process comprising polymerizing in the presence of a supported catalyst system formed by the steps of: a) introducing a porous inorganic carrier to a vessel having a starting pressure; b) depressurizing the vessel; c) introducing into the vessel a solution comprising a metallocene catalyst component and an activator while maintaining the depressurized pressure from step (b); d) pressurizing the vessel; and e) recovering the supported catalyst system; wherein steps (a) and (b) are performed before step (c). 2. The process of claim 1, wherein step (b) is performed prior to step (a).3. The process of claim 1, wherein the vessel is depressurized to less than 1 atm.4. The process of claim 1, wherein the vessel is depressurized to less than 0.5 atm.5. The process of claim 1, wherein the starting pressure is greater than 1 atm.6. The process of claim 1, wherein step (d) comprises introducing an inert gas into the vessel.7. The process of claim 1, wherein the vessel in step (d) is pressurized to a pressure of less than 1 atm.8. The process of claim 1, wherein the metallocene catalyst component is introduced into the vessel prior to the introduction of the activator.9. The process of claim 1, wherein the method further comprises the step of drying the supported catalyst.10. The process of claim 1, wherein the carrier contains adsorbed or absorbed water.11. The process claim 1, wherein the vessel in step (b) is depressurized to below ambient pressure.12. The process of claim 1, wherein the activator is an alkylalumoxane.13. The process of claim 1, wherein the metallocene is selected from the group consisting of bridged zirconocenes, unbridged zirconocenes, bridged hafnocenes, and unbridged hafnocenes.14. The process of claim 12, wherein the mole ratio of alkylalumoxane to metallocene component ranges from 20:1 to 800:1.15. The process of claim 1, comprising contacting the supported catalyst system with ethylene and alpha-olefin monomers having from 3 to 12 carbon atoms.16. The process of claim 15, wherein the olefins and supported catalyst system are contacted in a gas phase fluidized bed polymerization reactor.17. The process of claim 16, wherein a polyolefin is recovered having a density of from 0.86 g/cm3to 0.97 g/cm3, a melt index of from 0.3 to 200 dg/min, a MWD of from greater than 2 to 50, and a CDBI of greater than 30%.18. The process of claim 17, wherein the recovered polyolefin is formed into a film.