Process for the stereospecific polymerization of alpha-olefins and catalyst system which can be employed for this polymerization
US5780379A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 13, 1997 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | May 13, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F10/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Process for the polymerization of alpha-olefins, which is carried out in the presence of a catalyst system comprising: PA1 (1) a solid based on completed titanium trichloride; PA1 (2) an organometallic compound of metals of groups IA, IIA, IIB and IIIB of the Periodic Table, and PA1 (3) an electron-donor organic compound, the solid (1) based on complexed titanium trichloride having been preactivated by being brought into contact with a preactivator comprising the product of reaction of a trialkylaluminum or alkylaluminum chloride compound (a) and of a compound (b) chosen from hydroxyaromatic compounds whose hydroxyl group is sterically hindered, then isolating the predetermined solid (1) from the medium in which it was found. This process enables propylene to be polymerized with an improved stereospecificity without any significant decrease in catalyst activity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.