US4081589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elimination of fibrous polymers
Assignee: Standard Oil Co
•
Filing: 1976-12-20
•
Granted: 1978-03-28
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Expires: 1996-12-20
Abstract
Abstract Adding a finely divided oxide to a terminal olefin polymerization catalyst comprising a hydrocarbon-soluble transition metal compound and a Group II or III metal organic compound reduces the amount of fibrous polymer produced.
Inventors
- 👤 Edwin F. Peters
- 👤 David E. Boone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:58
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
In a process for polymerizing alpha-olefins comprising contacting an alpha-olefin or mixtures thereof with a catalyst comprising an effective catalytic amount of a catalyst component prepared from (a) a hydrocarbon-soluble transition metal compound supported on a Group IIA, IIB or VIIB oxide, hydroxide, hydrous oxide, alkoxide or halide and (b) a Group II-III metal organic promoter, the improvement comprising adding to such catalyst an effective amount of a finely divided oxide such that fibrous polymer formation is inhibited.
Claim 2
Dependent Claim
78 words
In a process for polymerizing alpha-olefins comprising contacting an alpha-olefin or mixtures thereof with a catalyst comprising an effective catalytic amount of a catalyst component prepared from (a) a hydrocarbon-soluble transition metal compound supported on a Group IIA, IIB or VIIB oxide, hydroxide, hydrous oxide, alkoxide or halide and (b) a Group II-III metal organic promoter, the improvement comprising adding to such catalyst an effective amount of a finely divided oxide such that fibrous polymer formation is inhibited.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the oxide is silica, alumina, titania, magnesia, zirconia, calcium oxide or mixtures thereof.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the alpha-olefin is ethylene, propylene or mixtures thereof.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein the oxide is silica, alumina or mixtures thereof.
Claim 6
Dependent Claim
29 words
The process of claim 1 wherein the hydrocarbon-soluble transition metal compound is titanium tetrachloride, titanium tetrabromide, butoxytitanium trichloride, dibutoxytitanium dichloride, tetrabutyl titanate, vanadium tetrachloride, zirconium tetrachloride or chromyl chloride.
Claim 7
Dependent Claim
23 words
The process of claim 1 wherein the transition metal compound is supported on magnesium hydroxide/aluminum trichloride, magnesium ethoxide/aluminum trichloride, magnesium chloride/or magnesium ethoxide.
Claim 8
Dependent Claim
14 words
The process of claim 6 wherein the hydrocarbon-soluble transition metal compound is titanium tetrachloride.
Claim 9
Dependent Claim
14 words
The process of claim 5 wherein the oxide is silica, alumina, or mixtures thereof.
Claim 10
Dependent Claim
14 words
The process of claim 7 wherein the oxide is silica, alumina, or mixtures thereof.
Claim 11
Dependent Claim
14 words
The process of claim 6 wherein the hydrocarbon-soluble transition metal compound is dibutoxytitanium dichloride.
References Cited (Backward Citations)
US3397195A
Cited
GB1158355A
Cited
US3658722A
Cited
US3759884A
Cited
US3700638A
Cited
GB1335887A
Cited
US3951935A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |