Robust spray-dried ziegler-natta procatalyst and polymerization process employing same
US8173569B2 · kind B2 · utility
2Cited by
45References
13Claims
0Family size
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Key dates
| Filing date | Jun 24, 2005 |
| Grant date | May 8, 2012 |
| Priority date | — |
| Expiry date | Apr 13, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2410/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A Ziegler-Natta procatalyst composition in the form of solid particles and comprising magnesium, halide and transition metal moieties, said particles having an average size (D50) of from 10 to 70 μm, characterized in that at least 5 percent of the particles have internal void volume substantially or fully enclosed by a monolithic surface layer (shell), said layer being characterized by an average shell thickness/particle size ratio (Thickness Ratio) determined by SEM techniques for particles having particle size greater than 30 μm of greater than 0.2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.