Supported polymerisation catalysts
US7309677B2 · kind B2 · utility
1Cited by
12References
15Claims
0Family size
Assignee
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Key dates
| Filing date | Aug 14, 2003 |
| Grant date | Dec 18, 2007 |
| Priority date | — |
| Expiry date | Aug 14, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/6592
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for the preparation of a supported transition metal catalyst system which includes the steps of: (i) mixing together in a suitable solvent (a) an aluminoxane and (b) an ionic activator containing a cation and an anion, wherein the anion has at least one substituent containing a moiety having an active hydrogen, (ii) addition of the mixture from step (i) to a support material, and (iii) addition of a transition metal compound in a suitable solvent. The use of tetraisobutylaluminoxane as the aluminoxane results in a more stable activity profile and improved polymer properties in particular melt strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.