Method for the preparation of a particulate carrier for a polymerization catalyst
US5468698A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1994 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | May 11, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F10/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The invention relates to a method for preparing a particulate carrier for an olefin polymerization procatalyst comprising a complex of an organic compound/transition metal compound as a carrier. In the method a melt MgCl.sub.2 --C.sub.2 H.sub.5 OH-complex is provided containing on average 3.3 to 5.5 C.sub.2 H.sub.5 OH-molecules per each MgCl.sub.2 -molecule, the melt MgCl.sub.2 -complex is sprayed through a nozzle dispersing it into a chamber, wherein a particulate carrier is formed of it and the particulate carrier is removed from the chamber. Unlike prior known methods to produce a carrier having an optimal C.sub.2 H.sub.5 OH content in this invention the removal rate--by the aid of heat--of C.sub.2 H.sub.5 OH from the MgCl.sub.2 --C.sub.2 H.sub.5 OH-complex in connection with the spraying that the particulate carrier is controlled. As a result, the particulate carrier obtained possesses on average 2.0 to 3.2 C.sub.2 H.sub.5 OH molecules per each MgCl.sub.2 molecule. Such a carrier has a suitable C.sub.2 H.sub.5 OH content and a good morphology and spraying it does not raise any difficulties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.