Components of catalysts useful for the polymerization of .alpha.-olefins, and catalysts prepared therefrom
US4149990A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 8, 1977 |
| Grant date | Apr 17, 1979 |
| Priority date | — |
| Expiry date | Aug 8, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/906
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There are disclosed new solid catalyst-forming components for use in preparing catalysts for the stereoregular polymerization of alpha-olefins containing at least 3 carbon atoms, mixtures of alpha-olefins with one another and/or with ethylene, said components being obtained by reacting PA0 (a) at least one hydrocarbon-soluble halogenated Ti compound; PA0 (b) a product comprising a Mg dihalide obtained by decomposition of an adduct of at least a Mg dihalide and an electron-donor compound present in the adduct in an amount of at least 0.5 mole per mole of Mg dihalide, the decomposition product being characterized in that, in its X-rays powder spectrum, instead of the diffraction line of maximum intensity which appears in the X-rays powder spectrum of the normal Mg dihalide, a halo appears whose intensity maximum is shifted with respect to said line, and PA0 (c) an electron-donor compound which does not contain active hydrogen atoms. The electron-donor compound (c) can be reacted with (a) or combined with (b) before the reaction of (a) and (b). Methods for preparing the new catalyst-forming components, catalysts obtained therefrom, and use of the catalysts for the production of crysta…
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