Silica-supported polymerization catalyst
US7452947B2 · kind B2 · utility
2Cited by
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13Claims
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Key dates
| Filing date | Aug 14, 2003 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | May 2, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/65927
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the preparation of a silicon containing transition metal compound that includes the steps of (a) non-hydrolytic sol-gel condensation of a silane of formula LxSiQn wherein L is a σ-bonded ligand, Q is an anionic ligand, and x+n=4 with a halogenated silane (or siloxane) and an alkoxysilane, (b) optionally alkylation, (c) deprotonation and (d) addition of a transition metal compound. The process allows for the preparation of transition metal compounds which may suitably be used with cocatalysts for the polymerization of olefins, in particular for such processes carried out in the gas phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.