EP0492523A2
Expired / Lapsed
EP
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High activity vanadium-based catalyst
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1991-12-20
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Granted: —
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Expires: 2011-12-20
Abstract
Abstract A vanadium-based catalyst system is treated with a ketone as a means of enhancing catalyst activity and polymer productivity.
Inventors
- 👤 Sun-Chueh Kao
- 👤 Kevin Joseph Cann
- 👤 Frederick John Karol
- 👤 Mark Gregory Goode
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 06:47
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A catalyst system comprising: (A) a solid catalyst component consisting essentially of (1) a solid, particulate, porous inorganic carrier, as support for (2) the reaction product of (a) a vanadium trihalide and (b) an electron donor, and (3) a boron halide or alkylaluminum modifier, (B) a triethylaluminum cocatalyst, (C) a halohydrocarbon polymerization promoter, and (D) a ketone activity enhancer having the formula: wherein: R¹ and R² are independently monovalent hydrocarbon radicals containing from 1 to 20 carbon atoms, or together make up a cycloaliphatic ring containing from 3 to 20 carbon atoms, said ketone activity enhancer being present in an amount sufficient to provide a molar ratio of such ketone to the triethylaluminum cocatalyst of from 0.1:1 to 0.7:1.
Claim 2
Dependent Claim
51 words
A catalyst system as in claim 1 wherein at least one of R¹ and R² is an alkenyl radical containing from 1 to 6 carbon atoms or a cycloalkenyl radical containing from 3 to 6 carbon atoms, or together make up a cycloalkenyl ring containing from 3 to 6 carbon atoms.
Claim 3
Dependent Claim
34 words
A catalyst system as in claim 1 or 2 wherein the ketone activity enhancer is selected from the group consisting of acetone, methylethyl ketone, diphenyl ketone, 2,5-hexanedione, 1,4-cyclohexanedione, 5-hexene-2-one, 4-hexene-3-one, methylvinyl ketone and 2-cyclohexene-1-one.
Claim 4
Dependent Claim
37 words
A catalyst system as in any of claims 1-3 wherein the ketone activity enhancer is present in an amount sufficient to provide a molar ratio of such ketone to the triethylaluminum cocatalyst of from 0.2:1 to 0.3:1.
Claim 5
Dependent Claim
35 words
A process for homopolymerizing ethylene, or copolymerizing ethylene with one or more alpha olefins containing from 3 to 8 carbon atoms, which process comprises using a catalyst system according to any one of claims 1-4.
Claim 6
Dependent Claim
21 words
A process as in claim 5 wherein polymerization is effected in a slurry at a temperature of from 10°C to 115°C.
Claim 7
Dependent Claim
21 words
A process as in claim 6 wherein polymerization is effected in a slurry at a temperature of from 80°C to 110°C.
References Cited (Backward Citations)
No citation records indexed.
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