US3723403A
Expired / Lapsed
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Olefine polymerization at high pressures using a dispersed ziegler-type catalyst
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-10-30
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Granted: 1973-03-27
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Expires: 1989-10-30
Abstract
Abstract Ethylene is polymerized at high temperature and high pressure using a finely divided Ziegler catalyst comprising an organoaluminium compound and a titanium trihalide which has been finely divided by pre-treatment with an Alpha olefine or mixture thereof under conditions to form an amorphous polymer. The titanium trihalide can be titanium trichloride which has been prepared by the reduction of titanium tetrachloride with hydrogen, aluminum, or, preferably, an organo-aluminium compound.
Inventors
- 👤 J Greaves
- 👤 W Oakes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:02
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/903; Y10S526/906
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
21 words
The process of claim 1 wherein ethylene is polymerized at 140* to 300*C and a pressure of 1000 to 3000 atmospheres.
Claim 2
Dependent Claim
21 words
The process of claim 1 wherein ethylene is polymerized under conditions of temperature and pressure to give a single fluid phase.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein ethylene is polymerized at 160* to 260*C and at a pressure of at least 1400 atmospheres.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein ethylene is polymerized in the presence of a chain transfer agent.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein the trivalent titanium component is a titanium trihalide prepared by the reduction of titanium tetrachloride with hydrogen, aluminum or an organo-aluminum compound.
Claim 6
Dependent Claim
37 words
The process of claim 1 wherein the trivalent titanium component is dispersed by using it, together with an organo-aluminum activator, as a catalyst for the polymerization of an unbranched Alpha -olefine containing at least 5 carbon atoms.
Claim 7
Dependent Claim
38 words
The process of claim 1 wherein the trivalent titanium component is dispersed by using it, together with an organo-aluminum activator, as a catalyst for the polymerization of ethylene, propylene or butene-1 at a temperature of at least 60*C.
Claim 8
Dependent Claim
49 words
The process of claim 1 wherein the trivalent titanium component is dispersed by using it, together with an organo-aluminum activator, as a catalyst for the copolymerization of a mixture of Alpha -olefines to give an amorphous copolymer in which the monomer constituents are randomly distributed within the monomer chain.
Claim 9
Dependent Claim
39 words
The process of claim 1 wherein the trivalent titanium component is dispersed by using it, in the substantial absence of added organo-aluminum activator, as a catalyst for the polymerization of an Alpha -olefine of 2 to 16 carbon atoms.
Claim 10
Dependent Claim
55 words
The process of claim 6 wherein the trivalent titanium component is titanium trichloride prepared by the reduction of titanium tetrachloride with an organo-aluminum compound, which titanium trichloride has been dispersed by using it together with an organo-aluminum activator as a catalyst for the polymerization of an unbranched Alpha -olefine containing at least 5 carbon atoms.
Claim 11
Dependent Claim
31 words
The process of claim 1 wherein the polymerization conditions are such that ethylene is polymerized in an amount of at least 40,000 moles of ethylene per mole of trivalent titanium compound.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |