Patent US4077903A successfully refreshed from Google Patents.
US4077903A
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Preparation of an active olefin polymerization catalyst
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-11-26
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Granted: 1978-03-07
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Expires: 1995-11-26
Abstract
Abstract A titanium catalyst for polymerization of olefins is prepared by reduction of TiCl4 with a mixture of AlEt2Cl and AlEt3, where at high AlEt3 to AlEt2Cl ratios the aluminum reducing agents are added to the TiCl4 solution. The reduction is performed from -50 DEG to 0 DEG C in a hydrocarbon and the reduced titanium compound is activated by heating to a higher temperature and subsequently is used with a cocatalyst for polymerization of olefins.
Inventors
- 👤 Harry J. Wristers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:58
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/908
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A process of preparing TiCl 3 .nAlCl 3 catalysts where n = 0.25 to 0.35 having a mean particle diameter size of from 10 to 200 microns and narrow particle size distribution which consists of reducing TiCl 4 with a mixture of AlEt 3 + AlEt 2 Cl wherein the mole ratio of AlEt 3 to TiCl 4 is from 0.01 to 0.15:1 at a reduced temperature of from about -50° to about 0° C, gradually raising to an elevated temperature sufficient to convert the TiCl 3 .nAlCl 3 catalyst to the violet form.
Claim 2
Dependent Claim
94 words
A process of preparing TiCl 3 .nAlCl 3 catalysts where n = 0.25 to 0.35 having a mean particle diameter size of from 10 to 200 microns and narrow particle size distribution which consists of reducing TiCl 4 with a mixture of AlEt 3 + AlEt 2 Cl wherein the mole ratio of AlEt 3 to TiCl 4 is from 0.01 to 0.15:1 at a reduced temperature of from about -50° to about 0° C, gradually raising to an elevated temperature sufficient to convert the TiCl 3 .nAlCl 3 catalyst to the violet form.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein said ratio is about 0.05:1.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said ratio is about 0.15:1.
Claim 5
Dependent Claim
36 words
The process of claim 1 wherein said mixture of aluminum compounds is gradually added to said TiCl 4 over the space of about 0.2 to 10 hours at a temperature of from -50° to +50° C.
Claim 6
Dependent Claim
35 words
The process of claim 1 wherein said titanium compound is added to said mixture of aluminum compounds over a space of from 0.2 to 10 hours at a temperature of from -50° to +50° C.
Claim 7
Dependent Claim
12 words
The process of claim 4 which is carried out under constant stirring.
Claim 8
Dependent Claim
12 words
The process of claim 5 which is carried out under constant stirring.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein said mixture also is complexed with a Lewis base.
Claim 10
Dependent Claim
25 words
The process of claim 8 wherein said Lewis base is R--O--R', wherein R and R' are alkyl groups having from 2 to 6 carbon atoms.
Claim 11
Dependent Claim
12 words
The process of claim 9 wherein said ether is is diisoamyl ether.
References Cited (Backward Citations)
US2976271A
Cited
US2943068A
Cited
US2971925A
Cited
US3226336A
Cited
US3825524A
Cited
US3905915A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |