Patent US4520121A successfully refreshed from Google Patents.
US4520121A
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US
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Magnesium halide hydrates and polymerization catalysts prepared therefrom
Assignee: Phillips Petroleum Co
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Filing: 1983-10-28
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Granted: 1985-05-28
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Expires: 2003-10-28
Abstract
Abstract An inexpensive one-step process is disclosed for producing the lower hydrates of magnesium dihalide by comminuting hydrated magnesium dihalide and anhydrous magnesium dihalide. Also the use of such hydrous magnesium dihalide products in the olefin polymerization catalysts.
Inventors
- 👤 Kenneth E. Inkrott
- 👤 Gil R. Hawley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:28
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/02; C08F4/022; C08F10/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
A process for preparing a catalyst useful for the polymerization of olefins comprising reacting a hydrous magnesium dihalide composition with reactants comprising a benzoic acid ester and an alkoxytitanium compound to form a first catalyst component, then reacting said first catalyst component with an organoaluminum halide to form a solid product, then reacting said solid product with a halogenating agent comprising a titanium halide, wherein the molar ratio of water to magnesium dihalide in said hydrous magnesium dihalide composition is in the range of about 0.5/1 to 2/1 and the hydrous magnesium dihalide composition is prepared by comminuting a mixture of an anhydrous magnesium dihalide and a hydrous magnesium dihalide at least until the amount of the most highly hydrated magnesium dihalide species in the comminuted product has become substantially stabilized.
Claim 2
Dependent Claim
131 words
A process for preparing a catalyst useful for the polymerization of olefins comprising reacting a hydrous magnesium dihalide composition with reactants comprising a benzoic acid ester and an alkoxytitanium compound to form a first catalyst component, then reacting said first catalyst component with an organoaluminum halide to form a solid product, then reacting said solid product with a halogenating agent comprising a titanium halide, wherein the molar ratio of water to magnesium dihalide in said hydrous magnesium dihalide composition is in the range of about 0.5/1 to 2/1 and the hydrous magnesium dihalide composition is prepared by comminuting a mixture of an anhydrous magnesium dihalide and a hydrous magnesium dihalide at least until the amount of the most highly hydrated magnesium dihalide species in the comminuted product has become substantially stabilized.
Claim 3
Dependent Claim
23 words
A process according to claim 1 wherein said hydrous magnesium dihalide composition is substantially free of any tetra- or hexa-hydrous magnesium dihalide species.
Claim 4
Dependent Claim
25 words
A process according to claim 2 wherein said anhydrous magnesium dihalide comprises anhydrous MgCl 2 and said hydrous magnesium dihalide comprises hydrous MgCl 2 .
Claim 5
Dependent Claim
21 words
A process according to 3 wherein said mixture of hydrous MgCl 2 and anhydrous MgCl 2 is comminuted by ball milling.
Claim 6
Dependent Claim
21 words
A process according to 3 wherein said mixture of hydrous MgCl 2 and anhydrous MgCl 2 is comminuted by ball milling.
Claim 7
Dependent Claim
42 words
A process according to claim 4 wherein said alkoxytitanium compound comprises a compound of the formula Ti(OR) 4 wherein each R is individually selected from alkyl groups containing 1 to 20 carbon atoms, and wherein said organoaluminum halide comprises ethyl aluminum sesquichloride.
Claim 8
Dependent Claim
20 words
A process according to claim 5 wherein a phenol is also employed in the production of said first catalyst component.
Claim 9
Dependent Claim
17 words
A process according to claim 6 wherein said ester comprises ethyl benzoate and said phenol comprises 4-phenylphenol.
Claim 10
Dependent Claim
20 words
A process according to claim 7 wherein said halogenating agent comprises titanium tetrachloride, HSiCl 3 , and SiCl 4 .
Claim 11
Dependent Claim
13 words
A process according to claim 7 wherein said titanium compound is titanium tetra-n-butoxide.
Claim 12
Dependent Claim
20 words
A process according to claim 9 wherein said halogenating agent comprises titanium tetrachloride, HSiCl 3 , and SiCl 4 .
Claim 13
Dependent Claim
9 words
A catalyst produced by the process of claim 1.
Claim 14
Dependent Claim
17 words
A process according to claim 4 wherein said hydrous magnesium dichloride is MgCl 2 .6H 2 O.
Claim 15
Dependent Claim
29 words
A process according to claim 12 wherein the molar ratio of water to magnesium dihalide in said hydrous magnesium dihalide composition is in the range of 0.75/1 to 1.5/1.
Claim 16
Dependent Claim
23 words
A process according to claim 12 wherein the molar ratio of water to magnesium dihalide is in the range of 0.511 to 0.7511.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |