Patent US4194992A successfully refreshed from Google Patents.
US4194992A
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US
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Method for the polymerization of olefines and means suitable thereto
Assignee: SnamProgetti SpA
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Filing: 1978-07-20
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Granted: 1980-03-25
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Expires: 1998-07-20
Abstract
Abstract A novel catalyst system for the polymerization or copolymerization as the case may be, of alpha-olefines is disclosed, which comprises a cocatalyst which is an aluminum-organic compound and a catalyst proper which is obtained by reacting metal vapors (such as vapors of Mg, Al, Ti, V, Cr, Mn, Fe or their alloys) with Ti or V compounds, a halogen donor and a hydrocarbonaceous inert diluent being possibly present. Another aspect of the invention is the conduct of the polymerization, or copolymerization, run proper. Numerous examples of practical application of the catalyst preparation and use are given and the advantages of the novel approach shown.
Inventors
- 👤 Margherita Corbellini
- 👤 Alberto Greco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:40
CPC Classifications
C; C08; C08F; C08F10/00; C01; C01G; C01G31/00; C01G31/006; C01G37/00; C01G37/006; C01G49/00; C01G49/009; C01P; C01P2006/00; C01P2006/10; C01P2006/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
63 words
A method for the preparation of a catalyst containing titanium trichloride or vanadium trichloride and useful in the polymerization and copolymerization of ethylene with higher alphaolefines, which comprises vaporizing another metal selected from the group consisting of Al, Mg, Cr, Mn, Fe, V and Ti under vacuum and reacting the vapors thus obtained with TiCl 4 or VCl 4 at a low temperature.
Claim 2
Independent Claim
63 words
A method for the preparation of a catalyst containing titanium trichloride or vanadium trichloride and useful in the polymerization and copolymerization of ethylene with higher alphaolefines, which comprises vaporizing another metal selected from the group consisting of Al, Mg, Cr, Mn, Fe, V and Ti under vacuum and reacting the vapors thus obtained with TiCl 4 or VCl 4 at a low temperature.
Claim 3
Dependent Claim
36 words
A method for the preparation of a catalyst as claimed in claim 1, wherein the vaporization of said other metal is carried out under a vacuum in the range between 10 -1 and 10 -6 Torr.
Claim 4
Dependent Claim
40 words
A method for the preparation of a catalyst as claimed in claim 1, wherein the reaction between the metallic vapors and TiCl 4 or VCl 4 takes place at a temperature in the range between -80° C. and +20° C.
Claim 5
Dependent Claim
30 words
A method for the preparation of a catalyst as claimed in claim 1, wherein the reaction takes place at a temperature in the range between -60° C. and -20° C.
Claim 6
Dependent Claim
47 words
A method for the preparation of a catalyst as claimed in claim 1, wherein the reaction between the metallic vapors and TiCl 4 or VCl 4 takes place in the presence of an inert diluent selected from the group consisting of aliphatic, saturated, unsaturated and halogenated hydrocarbons.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |