US4552859A
Expired / Lapsed
US
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Olefin polymerization catalyst and process
Assignee: Akzo America Inc
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Filing: 1984-08-06
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Granted: 1985-11-12
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Expires: 2004-08-06
Abstract
Abstract Isotactic index improvement is achieved for C3 and higher alpha olefins in systems containing a catalyst component comprising titanium supported on a magnesium halide support. The titanium component is formed by copulverizing the magnesium halide with one or more electron donors followed by treatment with liquid titanium halide. The improvement is achieved by using a dialkylaluminoxane component with the trialkylaluminum co-catalyst normally used. In slurry polymerizations, the isotactic index of the polymer has been improved.
Inventors
- 👤 Elliot I. Band
- 👤 Michael J. Breen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:06
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
107 words
A catalyst for the polymerization of alpha olefins of the formula CH 2 =CHR, where R is an alkyl radical of 1-6 carbon atoms and mixtures thereof with ethylene, comprising: (a) a component containing titanium on a magnesium halide support which is obtained by copulverizing magnesium halide with one or more electron donors to form a copulverized product followed by reacting the copulverized product with a liquid titanium compound containing halogen; and (b) an organoaluminum component comprising a trialkylaluminum compound in admixture with an effective amount of a dialkylaluminoxane component to give improved performance characteristics to the catalyst as compared to when the component consists of trialkylaluminum.
Claim 2
Dependent Claim
107 words
A catalyst for the polymerization of alpha olefins of the formula CH 2 =CHR, where R is an alkyl radical of 1-6 carbon atoms and mixtures thereof with ethylene, comprising: (a) a component containing titanium on a magnesium halide support which is obtained by copulverizing magnesium halide with one or more electron donors to form a copulverized product followed by reacting the copulverized product with a liquid titanium compound containing halogen; and (b) an organoaluminum component comprising a trialkylaluminum compound in admixture with an effective amount of a dialkylaluminoxane component to give improved performance characteristics to the catalyst as compared to when the component consists of trialkylaluminum.
Claim 3
Dependent Claim
13 words
A catalyst as claimed in claim 1 wherein a phenol electron donor copulverized.
Claim 4
Dependent Claim
15 words
A catalyst as claimed in claim 1 wherein polysiloxane and phenol electron donors are copulverized.
Claim 5
Dependent Claim
23 words
A catalyst as claimed in claim 1 wherein a phenol electron donor, polysiloxane, titanium tetrahalide and a carboxylic ester electron donor are copulverized.
Claim 6
Dependent Claim
18 words
A catalyst as claimed in claim 1 wherein the liquid titanium compound containing halogen is TiCl 4 .
Claim 7
Dependent Claim
21 words
A catalyst as claimed in claim 4 wherein the organoaluminum component comprises trialkylaluminum and a dialkylaluminoxane with a carboxylic ester donor.
Claim 8
Dependent Claim
15 words
A catalyst as claimed in claim 1 wherein the organoaluminum component contains triethylaluminum and diethylaluminoxane.
Claim 9
Dependent Claim
15 words
A catalyst as claimed in claim 5 wherein the organoaluminum component contains triethylaluminum and diethylaluminoxane.
Claim 10
Dependent Claim
33 words
A catalyst as claimed in claim 1 wherein a phenol electron donor, a polysiloxane electron donor, TiCl 4 , and an ester of an aromatic carboxylic acid are copulverized with the magnesium chloride.
Claim 11
Dependent Claim
55 words
A catalyst as claimed in any of claims 1-8 and 9 where the total amount of aluminum in component (b) ranges from about 10:1 to about 600:1 as a molar ratio, based on the moles of titanium in component (a) and the mole ratio of trialkylaluminum to dialkylaluminoxane ranges from about 10:1 to about 1:3.
Claim 12
Dependent Claim
26 words
A catalyst as claimed in any of claim 1-8 and 9 wherein the mole ratio of trialkylaluminum to dialkylaluminoxane ranges from about 10:1 to about 1:3.
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) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |