High activity polyethylene catalysts
US5514634A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Jun 10, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An ethylene polymerization catalyst is prepared by impregnating a porous support, such as silica, with an organomagnesium compound such as a dialkylmagnesium compound, contacting the magnesium-containing support with a silane compound which is free of hydroxyl groups, such as tetraalkoxysilanes, e.g. tetraethyl orthosilicate, and incorporating a transition metal component, such as titanium tetrachloride, in a specific ratio to the magnesium and silane components. Activation of this catalyst precursor with dimethylaluminum chloride as a cocatalyst results in a catalyst system which is effective for the production of ethylene copolymers with multimodal molecular weight distributions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.