US4153576A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclopentadienyl chromium oxides
Assignee: Union Carbide Corp
•
Filing: 1978-05-02
•
Granted: 1979-05-08
•
Expires: 1998-05-02
Abstract
Abstract Cyclopentadienyl chromium alkyl/aryl oxides and siloxides have been synthesized which when deposited on silica and treated with a silane show catalytic activity in the polymerization of ethylene. These chromium compounds also can be used for scavenging oxygen and volatile sulfur compounds from various liquid and gaseous streams.
Inventors
- 👤 Frederick J. Karol
- 👤 Chisung Wu
- 👤 Walter T. Reichle
- 👤 Norma J. Maraschin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:12
CPC Classifications
C; C07; C07F; C07F11/00; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
184 words
An ethylene polymerization catalyst composition comprising a dried silica support and deposited thereon an effective amount of a cyclopentadienyl chromium alkyl/aryl oxide or siloxide having the formula: ##STR6## wherein n is an integer having values of 0 to 5, R' is alkyl having 1 to 10 carbons and R is a monovalent sterically hindered radical selected from the group consisting of: ##STR7## wherein each of Y, Y' and Y" is alkyl having 1 to 18 carbons or aryl having 6 to 12 carbons, ##STR8## wherein Y, Y' and Y" are as defined above and ##STR9## wherein Z and Z' are secondary or tertiary alkyls containing 3 to 5 carbon atoms, Z" is an alkyl group containing 1 to 6 carbon atoms and x is an integer having values of 0 to 1, together with at least one silane compound having the structure: H.sub.3 Si --(SiH.sub.2).sub.m H or R'.sub.4-p Si--H.sub.P wherein m is an integer having values of 0 to 3, R' is a saturated or unsaturated hydrocarbon group having 1 to 10 carbons and p is an integer having values of 1 to 4.
Claim 2
Dependent Claim
184 words
An ethylene polymerization catalyst composition comprising a dried silica support and deposited thereon an effective amount of a cyclopentadienyl chromium alkyl/aryl oxide or siloxide having the formula: ##STR6## wherein n is an integer having values of 0 to 5, R' is alkyl having 1 to 10 carbons and R is a monovalent sterically hindered radical selected from the group consisting of: ##STR7## wherein each of Y, Y' and Y" is alkyl having 1 to 18 carbons or aryl having 6 to 12 carbons, ##STR8## wherein Y, Y' and Y" are as defined above and ##STR9## wherein Z and Z' are secondary or tertiary alkyls containing 3 to 5 carbon atoms, Z" is an alkyl group containing 1 to 6 carbon atoms and x is an integer having values of 0 to 1, together with at least one silane compound having the structure: H.sub.3 Si --(SiH.sub.2).sub.m H or R'.sub.4-p Si--H.sub.P wherein m is an integer having values of 0 to 3, R' is a saturated or unsaturated hydrocarbon group having 1 to 10 carbons and p is an integer having values of 1 to 4.
Claim 3
Dependent Claim
9 words
Composition claimed in claim 1 wherein R is ##STR10##
Claim 4
Dependent Claim
9 words
Catalyst claimed in claim 1 wherein R is ##STR11##
Claim 5
Dependent Claim
9 words
Catalyst claimed in claim 1 wherein R is ##STR12##
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) | 1982-05-07 | 1982-11-06 | 1983-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-07 | 1986-11-06 | 1987-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-07 | 1990-11-06 | 1991-05-08 | $7700.00 | Window Closed / Lapsed |