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Patent US5118768A successfully refreshed from Google Patents.
US5118768A
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US
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Process for the production of elastomeric, primarily isotactic polyolefins and catalysts for use in said process
Assignee: Union Carbide Chemicals and Plastics Technology LLC
•
Filing: 1990-05-11
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Granted: 1992-06-02
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Expires: 2010-05-11
Abstract
Abstract A process for the production of elastomeric, primarily isotactic polyolefins which comprises polymerizing olefins in the presence of a catalyst which comprises the reaction product of a magnesium alkoxide and a tetravalent titanium halide wherein the reaction takes place in the presence of an electron donor which is an effectively hindered heterocyclic aromatic nitrogen compound and an organoaluminum compound.
Inventors
- 👤 Robert C. Job
- 👤 Donald F. Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:04
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
61 words
A process for the production of elastomeric, primarily isotactic polyolefins which comprises polymerizing olefins in the presence of a catalyst which comprises: (a) The reaction product of a magnesium alkoxide and a tetravalent titanium halide wherein the reaction takes place in the presence of an electron donor which is an effectively hindered heterocyclic aromatic nitrogen compound, and (b) An organoaluminum compound.
Claim 2
Dependent Claim
61 words
A process for the production of elastomeric, primarily isotactic polyolefins which comprises polymerizing olefins in the presence of a catalyst which comprises: (a) The reaction product of a magnesium alkoxide and a tetravalent titanium halide wherein the reaction takes place in the presence of an electron donor which is an effectively hindered heterocyclic aromatic nitrogen compound, and (b) An organoaluminum compound.
Claim 3
Dependent Claim
31 words
The process of claim 1 wherein the nitrogen compound is selected from the group consisting of 2,3-dimethylquinoxaline, quinaldine, 2,6-lutidine, 2,4,6-collidine, tetramethylpyrazine 2,4-dimethylquinoline, 2,6-dichloropyridine, 2-chloroquinoline, 2-chloro-6-methoxypyridine, 2,3-dichloroquinoxaline, 2,4,6-trichloropyrimidine, 2,4,5,6-tetrachloropyrimidine, 2-chlorolepidine and 6-chloro-2-picoline.
Claim 4
Dependent Claim
13 words
The process of claim 2 wherein the tetravalent titanium halide is titanium tetrachloride.
Claim 5
Dependent Claim
40 words
The process of claim 3 wherein the magnesium alkoxide is a compound of the formula MgR 1 R 2 , where R 1 is an alkoxide or aryl oxide group and R 2 is an alkoxide or aryloxide or halogen.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein both R 1 and R 2 are ethoxide.
Claim 7
Dependent Claim
55 words
The process of claim 3 wherein the magnesium alkoxide is a magnesium compound of the formula X where X is a counterion or ions having a total charge of -2 and R 3 and R 4 , which may be the same or different, are selected from alkyl groups of 1 to 4 carbon atoms.
Claim 8
Dependent Claim
18 words
The process of claim 6 wherein R 3 and R 4 are methyl groups and X is resorcinol.
Claim 9
Dependent Claim
10 words
The process of claim 1 wherein the olefin is propylene.
Claim 10
Dependent Claim
10 words
The process of claim 1 wherein the olefin is 1-butene.
References Cited (Backward Citations)
US3112301A
Cited
US3112300A
Cited
US3175999A
Cited
US3258455A
Cited
US3257370A
Cited
US3305538A
Cited
US3329741A
Cited
US3335121A
Cited
US3364190A
Cited
US3240773A
Cited
US3534006A
Cited
US4336360A
Cited
US4226963A
Cited
US4317898A
Cited
US4136243A
Cited
GB1486194A
Cited
US4072809A
Cited
US3950269A
Cited
US4011383A
Cited
US3971767A
Cited
US3932307A
Cited
US4017525A
Cited
GB1554340A
Cited
US4335225A
Cited
US4310439A
Cited
US4329253A
Cited
US4393182A
Cited
US4255281A
Cited
CA1146699A
Cited
US4487845A
Cited
US4347160A
Cited
US4325836A
Cited
US4394291A
Cited
US4442276A
Cited
US4581342A
Cited
EP0206753A1
Cited
US4754006A
Cited
US4710482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |