Catalyst precursor and catalyst for the high-temperature (co)polymerization of alpha-olefin
US9751959B2 · kind B2 · utility
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3References
21Claims
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Key dates
| Filing date | Dec 20, 2011 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Feb 1, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A precursor for the formation of catalysts for the (co)polymerization of α-olefins, comprising titanium, magnesium, at least one metal selected from hafnium and zirconium, aluminum and chlorine, obtained with a process comprising treatment with a siloxane compound. Said solid precursor, used in combination with a suitable co-catalyst in high-temperature (co)polymerization processes of α-olefins, shows an improved productivity, a high incorporation of co-monomers in the copolymerization of ethylene and an increased thermal stability with respect to the systems so far in use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.