US4085064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purple TiCl3 by direct low temperature reduction
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-12-12
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Granted: 1978-04-18
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Expires: 1995-12-12
Abstract
Abstract Reduction of TiCl 4 with an excess of Et n AlCl 3-n where n = 1 to 1.95 preferably AlEtCl 2 at -20° to +30° C results in a purple catalyst.
Inventors
- 👤 Harry J. Wristers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
In the process of preparing an olefin polymerization catalyst which comprises reducing TiCl 4 with AlR n X 3-n where R is C 1 to C 18 , n is 0 to 3, and X is F, Cl, Br or I and subjecting the resulting TiCl 3 catalyst to a Lewis base/TiCl 4 treatment to convert it to a purple crystallographic form to improve the efficiency and stereospecificity thereof, the improvement which comprises: utilizing AlR n X 3-n , where n = 1 to 1.95 and R is ethyl, in said reduction of TiCl 4 , in greater than stoichiometric amounts where the molar ratio of AlR n X 3-n to TiCl 4 is such that the ratio of n:TiCl 4 is between 1.0-4.5 at a temperature of from -30 ° C to about 30° C to produce a purple TiCl 3 catalyst prior to treatment with Lewis base/TiCl 4 , and utilizing in said Lewis base/TiCl 4 treatment, TiCl 4 in a concentration of about 5 to about 15 volume percent.
Claim 2
Dependent Claim
172 words
In the process of preparing an olefin polymerization catalyst which comprises reducing TiCl 4 with AlR n X 3-n where R is C 1 to C 18 , n is 0 to 3, and X is F, Cl, Br or I and subjecting the resulting TiCl 3 catalyst to a Lewis base/TiCl 4 treatment to convert it to a purple crystallographic form to improve the efficiency and stereospecificity thereof, the improvement which comprises: utilizing AlR n X 3-n , where n = 1 to 1.95 and R is ethyl, in said reduction of TiCl 4 , in greater than stoichiometric amounts where the molar ratio of AlR n X 3-n to TiCl 4 is such that the ratio of n:TiCl 4 is between 1.0-4.5 at a temperature of from -30 ° C to about 30° C to produce a purple TiCl 3 catalyst prior to treatment with Lewis base/TiCl 4 , and utilizing in said Lewis base/TiCl 4 treatment, TiCl 4 in a concentration of about 5 to about 15 volume percent.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said reducing agent is AlEtCl 2 .
Claim 4
Dependent Claim
30 words
The process of claim 1 where the molar ratio of AlR n X 3-n to TiCl 4 is such that the ratio of n:TiCl 4 is from 1.5 to 2.5.
Claim 5
Dependent Claim
38 words
The method of claim 1 wherein said Lewis base/TiCl 4 treatment is carried out by treating the purple TiCl 3 catalyst obtained by said reduction step with a Lewis base followed by treatment with a TiCl 4 solution.
Claim 6
Dependent Claim
28 words
A catalyst prepared according to claim 4, where the Lewis base is a material or mixture of materials containing one or more atoms of Groups VA and VIA.
Claim 7
Dependent Claim
14 words
A catalyst prepared according to claim 4, where the Lewis base is an ether.
Claim 8
Dependent Claim
26 words
A catalyst prepared according to claim 4, where the Lewis base is an ether, R--O--R', where R and R' are hydrocarbon radicals having 4-6 carbon atoms.
Claim 9
Dependent Claim
14 words
A catalyst prepared according to claim 4, where the Lewis base is di-isopentyl ether.
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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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |