US3844975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally aged hydride based polymerization catalyst
Assignee: Union Carbide Corp
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Filing: 1972-11-10
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Granted: 1974-10-29
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Expires: 1992-11-10
Abstract
Abstract Ethylene is homopolymerized, or copolymerized with other alpha olefins, with a catalyst comprising cyclopentadienyl chromium tricarbonyl hydride supported on activated SiO2, Al2O3 or SiO2Al2O3 and thermally aged in an inert atmosphere. The catalyst may be used to produce unsaturated polymers having a relatively low melt index.
Inventors
- 👤 F Karol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:13
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
AN OLEFIN POLYMERIZATION CATALYST WHICH IS PREPARED BY DEPOSITING CATALYTICALLY EFFECTIVE QUANTITIES OF AT LEAST ONE CHROMIUM COMPOUND HAVING THE STRUCTURE
Claim 2
Dependent Claim
21 words
AN OLEFIN POLYMERIZATION CATALYST WHICH IS PREPARED BY DEPOSITING CATALYTICALLY EFFECTIVE QUANTITIES OF AT LEAST ONE CHROMIUM COMPOUND HAVING THE STRUCTURE
Claim 3
Dependent Claim
23 words
A catalyst as in claim 1 in which said support has a surface area of about 50 to 1,000 square meters per gram.
Claim 4
Dependent Claim
35 words
A catalyst as in claim 2 which contains 0.001 to 10 percent by weight of said chromium compound and 99.999 to 90 percent by weight of said support prior to the heating of said catalyst.
Claim 5
Dependent Claim
33 words
A catalyst as in claim 3 which is prepared by depositing cyclopentadienyl chromium tricarbonyl hydride on activated silica and heating the deposited chromium compound at 300* to 700*C. for 0.5 to 3 hours.
Claim 6
Dependent Claim
111 words
A catalyst as in claim 4 which has been treated with 0.001 to 10 mols of organoaluminum compound per mol of chromium compound after heating of the supported chromium compound, said organoaluminum compound having either the structure (Z)zAl(H)y wherein Z is a C1 to C14 hydrocarbyl group, z is an integer from 1 to 3, inclusive, and y is an integer from 0 to 2, inclusive, with the proviso that y + z 3, or the structure (Z'')xAl(OZ'''')w wherein Z'' and Z'''' are the same or different C1 to C14 hydrocarbyl groups, and x and w are each integers of 1 or 2, with the proviso that x + w 3.
Claim 7
Dependent Claim
16 words
A catalyst as in claim 5 in which said organoaluminum compound is a trialkyl aluminum compound.
Claim 8
Dependent Claim
15 words
A catalyst as in claim 6 in which said aluminum trialkyl compound is aluminum triethyl.
Claim 9
Dependent Claim
33 words
A catalyst as in claim 3 which is prepared by depositing cyclopentadienyl chromium tricarbonyl hydride on activated silica-alumina and heating the deposited chromium compound at 300* to 700*C. for 0.5 to 3 hours.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |