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US3969332A
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US
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Polymerization of ethylene
Assignee: Ethylene-Plastique
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Filing: 1974-08-20
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Granted: 1976-07-13
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Expires: 1994-08-20
Abstract
Abstract A method for the polymerization or copolymerization of ethylene comprising polymerizing the ethylene at a pressure greater than 500 bars, at a temperature in the range 160° to 280°C and under conditions in which polymerization takes place in a single liquid phase, in the presence of a catalyst system comprising A. an alkylsiloxalane derivative of the formula, ##EQU1## and B. a halogenated titanium compound of the titanium trichloride type, the Al/Ti ratio between the constituents being between 1 and 10.
Inventors
- 👤 Pierre Gloriod
- 👤 Bernard Levresse
- 👤 Jean-Pierre Machon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:12
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
A method for the polymerization or copolymerization of ethylene comprising polymerizing the ethylene at a pressure greater than 500 bars, at a temperature within the range from 160° to 280°C and under conditions in which polymerization takes place in a single liquid phase, in the presence of a catalyst system comprising A. an alkylsiloxalane derivative of the formula: ##EQU10## wherein R 1 , R 2 , R 3 and R 4 are each selected from the group consisting of hydrocarbon radicals having from one to ten carbon atoms, and R 5 is ##EQU11## wherein R 1 , R 2 and R 3 are selected from the group consisting of hydrocarbon radicals having from 1 to 10 carbon atoms; the Si:Al ratio in the alkyl siloxalane being within the range from one to three; and B. a titanium trichloride; the constituents A and B being taken in amounts to give an Al/Ti ratio between 1 and 10.
Claim 2
Independent Claim
156 words
A method for the polymerization or copolymerization of ethylene comprising polymerizing the ethylene at a pressure greater than 500 bars, at a temperature within the range from 160° to 280°C and under conditions in which polymerization takes place in a single liquid phase, in the presence of a catalyst system comprising A. an alkylsiloxalane derivative of the formula: ##EQU10## wherein R 1 , R 2 , R 3 and R 4 are each selected from the group consisting of hydrocarbon radicals having from one to ten carbon atoms, and R 5 is ##EQU11## wherein R 1 , R 2 and R 3 are selected from the group consisting of hydrocarbon radicals having from 1 to 10 carbon atoms; the Si:Al ratio in the alkyl siloxalane being within the range from one to three; and B. a titanium trichloride; the constituents A and B being taken in amounts to give an Al/Ti ratio between 1 and 10.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the Al/Ti ratio is between 1 and 5.
Claim 4
Dependent Claim
24 words
Method according to claim 1, characterised in that the residence time of the catalyst in the polymerisation reactor is between 1 and 100 seconds.
Claim 5
Dependent Claim
19 words
Method according to claim 1 in which the titanium trichloride is of the α-, β-, γ-, or δ- form.
Claim 6
Dependent Claim
17 words
Method according to claim 1, in which the titanium trichloride contains aluminum trichloride in a cocrystallised form.
Claim 7
Dependent Claim
16 words
Method according to claim 1, in which the titanium trichloride contains TiCl 2 --AlCl 3 .
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |