Process for using metallocene catalyst in a continuous reactor system
US5393851A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1992 |
| Grant date | Feb 28, 1995 |
| Priority date | — |
| Expiry date | May 26, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a composition and a process wherein a metallocene catalyst is dissolved in an alumoxane which has been dissolved in a solvent to form a concentrated stock solution of metallocene-alumoxane which can be stored for at least 14 days. The metallocene-alumoxane solution is stored under an oxygen- and water-free environment and more preferably under argon at temperatures that can range from about 25 degrees Fahrenheit (-4 degrees C.) to about 85 degrees Fahrenheit (29 degrees C.). Before or at the time that the metallocene-alumoxane solution is injected into the reactor, it is diluted with a second solution comprised of either an alumoxane, an aluminum alkyl or mixtures thereof dissolved in an oleaginous solvent. The addition of the aluminum based co-catalyst serves a two fold purpose. First, it provides the aluminum necessary to enhance the catalytic reaction and second, the aluminum to metal atomic or mole ratio can be easily optimized by adjusting the amount of the second solution to establish an optimal catalyst efficiency. The second solution either can be added to the concentrated metallocene-alumoxane solution as a side stream into the reactor or can…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.