Patent US5117020A successfully refreshed from Google Patents.
US5117020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of metallocenes
Assignee: TotalEnergies Onetech Belgium SA
•
Filing: 1990-10-25
•
Granted: 1992-05-26
•
Expires: 2010-10-25
Abstract
Abstract A transition metal salt and powder of the solid reaction product of the ligand with an alkyllithium are reacted at room temperature in a non-polar hydrocarbon. The metallocene thus obtained has a sufficient purity for subsequent use as catalyst for the polymerization of olefins without further purification.
Inventors
- 👤 Abbas Razavi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:45
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/04; C08F110/06; C07; C07F; C07F17/00; C08F10/00; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/639; C08F4/63912; C08F4/6392; C08F4/63922; C08F4/63927; Y; Y10; Y10S; Y10S526/00; Y10S526/943
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
Process for the preparation of metallocenes, comprising the steps of (i) reacting in a non-polar hydrocarbon liquid a transition metal salt and powder of solid reaction product produced by reacting a ligand with an alkyllithium; and (ii) recovering a solid mixture of lithium salt and metallocene; wherein the ligand is selected from the group consisting of cyclopentadiene, substituted cyclopentadienes, and bridged dicyclopentadienes wherein each cyclopentadiene may be equal or different and may be substituted or not.
Claim 2
Dependent Claim
76 words
Process for the preparation of metallocenes, comprising the steps of (i) reacting in a non-polar hydrocarbon liquid a transition metal salt and powder of solid reaction product produced by reacting a ligand with an alkyllithium; and (ii) recovering a solid mixture of lithium salt and metallocene; wherein the ligand is selected from the group consisting of cyclopentadiene, substituted cyclopentadienes, and bridged dicyclopentadienes wherein each cyclopentadiene may be equal or different and may be substituted or not.
Claim 3
Dependent Claim
17 words
Process according to claim 1, wherein the transition metal is selected from groups 4, 5 and 6.
Claim 4
Dependent Claim
22 words
Process according to claim 2, wherein the transition metal is selected from the group consisting of Ti, Zr, Hf, V and Cr.
Claim 5
Dependent Claim
13 words
Process according to claim 1, wherein the transition metal salt is a halide.
Claim 6
Dependent Claim
19 words
Process according to claim 1, wherein the non-polar hydrocarbon liquid is an alkane having 3 to 12 carbon atoms.
Claim 7
Dependent Claim
19 words
Process according to claim 5, wherein the non-polar hydrocarbon liquid is an alkane having 4 to 6 carbon atoms.
Claim 8
Dependent Claim
12 words
Process according to claim 6, wherein the non-polar hydrocarbon liquid is pentane.
Claim 9
Dependent Claim
21 words
Process according to claim 1, wherein step (i) is carried out at a temperature of from -20° C. to +100° C.
Claim 10
Dependent Claim
21 words
Process according to claim 9, wherein step (i) is carried out at a temperature of from 0° C. to 60° C.
Claim 11
Dependent Claim
18 words
Process according to claim 9, wherein step (i) is carried out at a temperature of about 25° C.
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) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |