Process for the manufacture of a support for olefin polymerization catalysts and process for the polymerization of olefins
US5925589A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1996 |
| Grant date | Jul 20, 1999 |
| Priority date | — |
| Expiry date | Jul 19, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the manufacture of a support for olefin polymerization catalysts comprising silica, aluminium phosphate and optionally alumina, according to which a source of silica, chosen from alkaline aqueous silica sols and alkaline aqueous solutions of inorganic silicate, is added, in a first step, to an aqueous solution of a source of phosphate ions which has a pH of less than 5, the pH of the medium being maintained below 5 throughout the first step, an aluminium compound is added, in a second step, to the medium obtained from the first step and a precipitate is formed, in a third step, by adding a precipitation agent to the medium obtained from the second step, the pH of the precipitation medium being maintained above or equal to 5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.