Patent US4926002A successfully refreshed from Google Patents.
US4926002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for olefin polymerization
Assignee: Tonen General Sekiyu KK
•
Filing: 1989-07-11
•
Granted: 1990-05-15
•
Expires: 2009-07-11
Abstract
Abstract A catalyst for olefin polymerization which comprises: (A) a catalyst component obtained by reacting (a) pentadiene or a derivative thereof with (b) an alkali metal and subsequently reacting the reaction product with (c) a titanium compound or zirconium compound, and (B) aluminoxane. t
Inventors
- 👤 Tadanao Kohara
- 👤 Satoshi Ueki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:55
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/941; Y10S526/943
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
A process for the polymerization of one or more olefins having from 2 to 8 carbon atoms which comprises contacting the olefin(s) in a polymerization reactor under polymerization conditions in the presence of a catalyst comprising: (i) a catalyst component obtained by reacting, (a) a pentadiene represented by the formula: ##STR4## wherein R 1 represents hydrogen, a hydrocarbyl group having from 1 to 8 carbon atoms, or a --Si(OR 4 ) 3 group, R 2 and R 3 , which can be the same or different, each represents a hydrogen or hydrocarbyl group having one 1 to 8 carbon atoms and R 4 represents a hydrocarbyl group having 1 to 5 carbon atoms with (b) an alkali metal, and contacting the product therefrom with, (c) a Group 4b metal compound, and (ii) an alumoxane.
Claim 2
Dependent Claim
134 words
A process for the polymerization of one or more olefins having from 2 to 8 carbon atoms which comprises contacting the olefin(s) in a polymerization reactor under polymerization conditions in the presence of a catalyst comprising: (i) a catalyst component obtained by reacting, (a) a pentadiene represented by the formula: ##STR4## wherein R 1 represents hydrogen, a hydrocarbyl group having from 1 to 8 carbon atoms, or a --Si(OR 4 ) 3 group, R 2 and R 3 , which can be the same or different, each represents a hydrogen or hydrocarbyl group having one 1 to 8 carbon atoms and R 4 represents a hydrocarbyl group having 1 to 5 carbon atoms with (b) an alkali metal, and contacting the product therefrom with, (c) a Group 4b metal compound, and (ii) an alumoxane.
Claim 3
Dependent Claim
18 words
The process in accordance with claim 1 wherein the Group 4b metal is selected from zirconium and titanium.
Claim 4
Dependent Claim
21 words
The process in accordance with claim 1 wherein the Group 4b metal compound is a titanium halide or a zirconium halide.
Claim 5
Dependent Claim
20 words
The process in accordance with claim 2 wherein the Group 4b metal is a titanium halide or a zirconium halide.
Claim 6
Dependent Claim
15 words
The process in accordance with claim 1 further characterizing being supported on a metal oxide.
Claim 7
Dependent Claim
17 words
The process in accordance with claim 4 wherein the catalyst component is supported on a metal oxide.
References Cited (Backward Citations)
US3046288A
Cited
US3306919A
Cited
US4769510A
Cited
US4704491A
Cited
US4658078A
Cited
US4814540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |