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Patent US5162466A successfully refreshed from Google Patents.
US5162466A
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Use of methylene-bridged derivatives of cyclopentadienyl dicarbollide complexes of titanium, zirconium and hafnium as polymerization catalysts
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1991-12-31
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Granted: 1992-11-10
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Expires: 2011-12-31
Abstract
Abstract Methylene bridged derivatives of novel cyclopentadienyl dicarbollide complexes of titanium, zirconium and hafnium display high activity as ethylene polymerization catalysts in the absence of a cocatalyst.
Inventors
- 👤 Frederick J. Karol
- 👤 Sun-Chueh Kao
- 👤 Robert C. Brady, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:34
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F4/659; C08F4/65912; C08F4/6592; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
77 words
A process for polymerizing ethylene, or copolymerizing ethylene with an alpha olefin having from 3 to 8 carbon atoms, which comprises contacting ethylene, or a mixture of ethylene and at least one alpha olefin having 3 to 8 carbon atoms, in an inert liquid hydrocarbon, with a methylene-bridged cyclopentadienyl dicarbollide complex of the formula: [(Cp.sup./)(C.sub.2 B.sub.9 H.sub.11)M].sub.2 -(μ-CH.sub.2) wherein: Cp / is an unsubstituted, alkyl-substituted, or fused ring cyclopentadienyl radical, and M is Ti, Zr or Hf.
Claim 2
Dependent Claim
77 words
A process for polymerizing ethylene, or copolymerizing ethylene with an alpha olefin having from 3 to 8 carbon atoms, which comprises contacting ethylene, or a mixture of ethylene and at least one alpha olefin having 3 to 8 carbon atoms, in an inert liquid hydrocarbon, with a methylene-bridged cyclopentadienyl dicarbollide complex of the formula: [(Cp.sup./)(C.sub.2 B.sub.9 H.sub.11)M].sub.2 -(μ-CH.sub.2) wherein: Cp / is an unsubstituted, alkyl-substituted, or fused ring cyclopentadienyl radical, and M is Ti, Zr or Hf.
Claim 3
Dependent Claim
10 words
A process as in claim 1 wherein M is Zr.
Claim 4
Dependent Claim
10 words
A process as in claim 1 wherein M is Hf.
Claim 5
Dependent Claim
22 words
A process as in claim 1 wherein Cp / is C 5 H 5 or C 5 (CH 3 ) 5 .
Claim 6
Dependent Claim
10 words
A process as in claim 4 wherein M is Zr.
Claim 7
Dependent Claim
10 words
A process as in claim 4 wherein M is Hf.
Claim 8
Dependent Claim
10 words
A process as in claim 1 wherein ethylene is homopolymerized.
Claim 9
Dependent Claim
10 words
A process as in claim 7 wherein M is Zr.
Claim 10
Dependent Claim
10 words
A process as in claim 7 wherein M is Hf.
Claim 11
Dependent Claim
22 words
A process as in claim 7 wherein Cp / is C 5 H 5 or C 5 (CH 3 ) 5 .
Claim 12
Dependent Claim
10 words
A process as in claim 10 wherein M is Zr.
Claim 13
Dependent Claim
10 words
A process as in claim 10 wherein M is Hf.
Claim 14
Dependent Claim
20 words
A process as in claim 7 wherein polymerization is effected at a temperature of from 10° C. to 90° C.
Claim 15
Dependent Claim
10 words
A process as in claim 13 wherein M is Zr.
Claim 16
Dependent Claim
10 words
A process as in claim 13 wherein M is Hf.
Claim 17
Dependent Claim
22 words
A process as in claim 13 wherein Cp / is C 5 H 5 or C 5 (CH 3 ) 5 .
Claim 18
Dependent Claim
10 words
A process as in claim 16 wherein M is Zr.
Claim 19
Dependent Claim
10 words
A process as in claim 16 wherein M is Hf.
Claim 20
Dependent Claim
35 words
A process as in claim 13 wherein polymerization is effected in the presence of an alkylaluminum compound having the formula Al(R.sup./).sub.3 wherein R / is an alkyl radical containing from 2 to 8 carbon atoms.
Claim 21
Dependent Claim
10 words
A process as in claim 19 wherein M is Zr.
Claim 22
Dependent Claim
10 words
A process as in claim 19 wherein M is Hf.
Claim 23
Dependent Claim
22 words
A process as in claim 19 wherein Cp / is C 5 H 5 or C 5 (CH 3 ) 5 .
Claim 24
Dependent Claim
10 words
A process as in claim 22 wherein M is Zr.
Claim 25
Dependent Claim
10 words
A process as in claim 22 wherein M is Hf.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |