Composition containing magnesium, titanium, halogen and an inner electron donor, its preparation and use for the polymerization of alpha-olefins
US6207607A · kind A · utility
6Cited by
3References
49Claims
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Key dates
| Filing date | Dec 23, 1998 |
| Grant date | Mar 27, 2001 |
| Priority date | — |
| Expiry date | Dec 23, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F210/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is the homogenous reaction at 40-200.degree. C. of MgX.sup.1.sub.2 -nR.sup.1 OH (where n=2.0-6.4) with TiX.sup.2.sub.4 and a higher (C.sub.6 -C.sub.20) alkyl ester of a carboxylic acid, optionally in the presence of a solvent. In such a completely homogenous reaction, no carrier appears. In order to obtain a product in the liquid stage, the molar ratio between the ester and the MgX.sup.1.sub.2.nR.sup.1 OH should be at least 0.8/j wherein j is the number of carboxyl groups in the ester. If the ester has two carboxyl groups, for instance, j is 2 and the molar ratio should be at least 0.8/2, that is, 0.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.