US4401641A
Expired / Lapsed
US
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Process for preparing catalyst carrier of magnesium chloride
Assignee: Montedison SpA
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Filing: 1981-12-28
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Granted: 1983-08-30
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Expires: 2001-12-28
Abstract
Abstract A new crystalline form (beta form) of MgCl2 is disclosed, as are methods for obtaining it by reaction of SOCl2 with hydrated MgCl2 at a temperature comprised between room temperature and the boiling point of SOCl2.
Inventors
- 👤 Enrico Albizzati
- 👤 Ivano Bassi
- 👤 Giorgio Foschini
- 👤 Sandro Parodi
- 👤 Franco Pirinoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:05
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/02; C08F4/022; C01; C01F; C01F5/00; C01F5/26; C01F5/30; C01F5/34; C01P; C01P2002/00; C01P2002/70; C01P2002/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
Process for preparing a carrier for catalysts for the polymerization of olefins and consisting of practically anhydrous magnesium chloride, which process comprises first treating hydrated magnesium chloride with thionyl chloride at a temperature between 25° C. and 60° C. and then treating the product thus obtained with boiling thionyl chloride to obtain a white crystalline solid practically free of H 2 O, the composition of which corresponds to that of MgCl 2 , and which shows an X-rays diffraction spectrum in which the reflection lines of maximum intensity appear at the following lattice distances: d=5.90 A intensity f d=2.77 A intensity ff d=1.814 A intensity f.
Claim 2
Dependent Claim
106 words
Process for preparing a carrier for catalysts for the polymerization of olefins and consisting of practically anhydrous magnesium chloride, which process comprises first treating hydrated magnesium chloride with thionyl chloride at a temperature between 25° C. and 60° C. and then treating the product thus obtained with boiling thionyl chloride to obtain a white crystalline solid practically free of H 2 O, the composition of which corresponds to that of MgCl 2 , and which shows an X-rays diffraction spectrum in which the reflection lines of maximum intensity appear at the following lattice distances: d=5.90 A intensity f d=2.77 A intensity ff d=1.814 A intensity f.
References Cited (Backward Citations)
GB1387890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |