Patent US3676415A successfully refreshed from Google Patents.
US3676415A
Expired / Lapsed
US
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Process for polymerizing {60 -olefins
Assignee: Hoechst AG
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Filing: 1969-06-25
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Granted: 1972-07-11
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Expires: 1989-06-25
Abstract
Abstract The invention provides a process for homopolymerizing or copolymerizing ethylene in the presence of mixed catalysts comprising as component A the reaction products of specific tetravalent titanium compounds with halogen-free magnesium compounds containing 0.1 to 2 moles of OH groups per gram-atom of magnesium and as component B an organo-aluminum compound. Under a pressure below 20 atmospheres the yields are so high per unit of catalyst that the residues thereof need not be removed from the polymer. It is possible to produce polymers having a very narrow distribution of molecular weight and very good color and corrosion values.
Inventors
- 👤 Bernd Diedrich
- 👤 Karl Diether Keil
- 👤 Kurt Rust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:21
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C07; C07F; C07F7/00; C07F7/003; Y; Y10; Y10S; Y10S526/00; Y10S526/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
13 words
The process of claim 1 wherein Mg(OH)2 is the hydroxyl containing magnesium compound.
Claim 2
Dependent Claim
22 words
The process of claim 1 wherein hydroxyl containing magnesium carbonates, magnesium sulfates or magnesium carboxylates are used as hydroxyl containing magnesium compounds.
Claim 3
Dependent Claim
40 words
The process of claim 1 wherein aluminum trialkyls of the formula Al(R)3 or dialkyl-aluminum hydrides of the formula Al(R2)H in which R stands for identical or different hydrocarbon radicals having one to 16 carbon atoms are used as organo-aluminum compounds.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein component A contains 0.05 to 10 millimoles of titanium per gram.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein component A is prepared by reacting the magnesium and titanium compounds at a temperature in the range of from 20* to 120* C in an inert diluent.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein ethylene is copolymerized with propylene, butene-(1) or 4-methyl-pentene-(1).
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the molecular weight of the resulting polymer is regulated by means of hydrogen.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |