Preactivated catalytic complex spogospheres
US4210729A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 27, 1973 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Aug 27, 1993 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Storage stability of Ziegler-type catalysts for .alpha.-olefin polymerization and having a specific surface greater than 75 m.sup.2 /g is improved by treating the catalysts with a preactivator which is an organic compound of a metal of one of Groups Ia, IIa, IIb and IIIa of the Periodic Table. PAC CROSS-REFERENCE TO RELATED APPLICATION The invention described herein is directly related to that described in copending Application Ser. No. 236,407, filed Mar. 21st, 1972. The entire text of that application is incorporated herein by reference. PAC BACKGROUND OF THE INVENTION Ziegler-type microporous catalytic complexes having a specific surface area greater than 75 m.sup.2 /g and useful for the polymerization of .alpha.-olefins are prepared by (a) reducing TiCl.sub.4 by means of an aluminum alkyl; (a') optionally isolating the reduced solid, based on TiCl.sub.3, from the medium in which it is formed; (b) treating this reduced solid with a complex forming agent; (c) removing any excess of the latter, if necessary; (d) bringing the solid treated in this way into contact with TiCl.sub.4 ; and (e) isolating the catalyst complex thus formed. These catalyst complexes are characterized by a m…
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