Process for the polymerization of olefins
US6001939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1997 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Mar 7, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/16
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the polymerization of olefins, in which at least one olef in is placed in contact with a catalytic system comprising: PA1 (a) a solid catalytic complex based on magnesium, on transition metal and on halogen, and PA1 (b) an organometallic compound of a metal from groups IA, IIA, IIB, IIIA and IVA of the Periodic Table, the said solid catalytic complex (a) being prepared by reacting, in a first step, at least one magnesium compound with at least one compound of a transition metal from group IVB or VB of the Periodic Table until a liquid complex is obtained, by treating the said liquid complex, in a second step, using a halogen-containing organoaluminium compound, in order to precipitate the liquid complex as a solid catalytic complex, by separating, in a third step, the solid catalytic complex precipitated and by treating, in a fourth step, the separated solid catalytic complex obtained after the third step using a halogen-containing organoaluminium compound of general formula AlR.sub.n X.sub.3-n. The process has the effect of increasing the apparent density of the polyolefin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.