Solid main catalyst component for ethylene polymerization, a process for preparing the same and a catalyst containing the same
US7405176B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 28, 2004 |
| Grant date | Jul 29, 2008 |
| Priority date | — |
| Expiry date | Dec 13, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F110/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a high-activity solid main catalyst component for ethylene polymerization, a process for preparing the same and a catalyst containing the same. The main catalyst component consists essentially of a magnesium compound, a titanium compound, an electron donor, an alkyl aluminum compound and fumed silica, and is prepared by a process comprising the step of: reacting powdered magnesium with an alkyl halide to form a magnesium compound in the nascent state; adding the magnesium compound in the nascent state together with a titanium compound and an alkyl aluminum compound into an electron donor to form a complex; adding and well dispersing a fumed silica thereto to form a homogeneous thick mixture; molding and drying the mixture to form main catalyst component particles with good particle morphology; and optionally, dispersing the main catalyst component particles into a hydrocarbon solvent or a mineral oil to form a slurry. The main catalyst component has high magnesium/titanium ratio, high titanium content, high polymerization activity, moderate initial activity so that polymerization can be stably performed, and there is little or no agglomerates during t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.