US4015059A
Expired / Lapsed
US
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Fused ring catalyst and ethylene polymerization process therewith
Assignee: Union Carbide Corp
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Filing: 1975-12-29
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Granted: 1977-03-29
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Expires: 1995-12-29
Abstract
Abstract Bis(indenyl)- and bis(fluorenyl)-chromium [II] compounds are deposited on activated inorganic oxide supports to provide catalysts which are useful in the presence of hydrogen, alone, or with cyclopentadiene compounds, for the polymerization of ethylene in high yields. These catalysts exhibit good thermal stability and show a unique response to cyclopentadiene compounds which allows production of polymers having a relatively broad range of melt index values.
Inventors
- 👤 Fredrick John Karol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:57
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
50 words
An olefin polymerization catalyst which comprises, supported on activated inorganic oxide, organochromium compound of the structure Ar--Cr II -- Ar' wherein Ar and Ar' are the same or different and are indenyl or fluorenyl radicals which are unsubstituted or substituted with C 1 to C 10 , inclusive hydrocarbon radicals.
Claim 2
Dependent Claim
50 words
An olefin polymerization catalyst which comprises, supported on activated inorganic oxide, organochromium compound of the structure Ar--Cr II -- Ar' wherein Ar and Ar' are the same or different and are indenyl or fluorenyl radicals which are unsubstituted or substituted with C 1 to C 10 , inclusive hydrocarbon radicals.
Claim 3
Dependent Claim
37 words
An olefin polymerization catalyst as in claim 1 in which the support has a surface area of about 50 to 1000 square meters per gram and is selected from the group consisting of silica, alumina and silica-alumina.
Claim 4
Dependent Claim
30 words
An olefin polymerization catalyst as in claim 2 which comprises 0.001 to 25% by weight of organochromium compound based on the combined weight of the support and the organochromium compound.
Claim 5
Dependent Claim
17 words
An olefin polymerization catalyst as in claim 3 in which the indenyl and fluorenyl radicals are unsubstituted.
Claim 6
Dependent Claim
16 words
An olefin polymerization catalyst as in claim 4 in which the organochromium compound comprises bis(indenyl)chromium [II].
Claim 7
Dependent Claim
16 words
An olefin polymerization catalyst as in claim 4 in which the organochromium compound comprises bis(fluorenyl)chromium [II].
Claim 8
Dependent Claim
29 words
An olefin polymerization catalyst as in claim 1 which has been treated with about 0.05 to 10 mols of cyclopentadiene compound per mol of organochromium compound in said catalyst.
Claim 9
Dependent Claim
29 words
An olefin polymerization catalyst as in claim 4 which has been treated with about 0.05 to 10 mols of cyclopentadiene compound per mol of organochromium compound in said catalyst.
Claim 10
Dependent Claim
15 words
An olefin polymerization catalyst as in claim 7 in which said cyclopentadiene compound is cyclopentadiene.
Claim 11
Dependent Claim
15 words
An olefin polymerization catalyst as in claim 8 in which said cyclopentadiene compound is cyclopentadiene.
Claim 12
Dependent Claim
62 words
A process for polymerizing a monomer charge comprising ethylene by contacting said charge with a catalyst which comprises organochromium compound of the structure Ar--Cr II -- Ar' wherein Ar and Ar' are the same or different and are indenyl or fluorenyl radicals which are unsubstituted or substituted with C 1 to C 10 , inclusive, hydrocarbon radicals supported on activated inorganic oxide.
Claim 13
Dependent Claim
62 words
A process for polymerizing a monomer charge comprising ethylene by contacting said charge with a catalyst which comprises organochromium compound of the structure Ar--Cr II -- Ar' wherein Ar and Ar' are the same or different and are indenyl or fluorenyl radicals which are unsubstituted or substituted with C 1 to C 10 , inclusive, hydrocarbon radicals supported on activated inorganic oxide.
Claim 14
Dependent Claim
14 words
A process as in claim 11 in which said monomer charge consists of ethylene.
Claim 15
Dependent Claim
23 words
A process as in claim 11 in which said monomer charge comprises ethylene and at least one C 3 to C 12 alpha-olefin.
Claim 16
Dependent Claim
17 words
A process as in claim 13 in which said C 3 to C 12 alpha-olefin comprises propylene.
Claim 17
Dependent Claim
12 words
A process as in claim 11 which is conducted in a solvent.
Claim 18
Dependent Claim
35 words
A process as in claim 11 in which said support has a surface area of about 50 to 1000 square meters per gram and is selected from the group consisting of silica, alumina and silica-alumina.
Claim 19
Dependent Claim
31 words
A process as in claim 16 in which said catalyst comprises 0.001 to 25% by weight of organochromium compound based on the combined weight of the support and the organochromium compound.
Claim 20
Dependent Claim
15 words
A process as in claim 17 in which the indenyl and fluorenyl radicals are unsubstituted.
Claim 21
Dependent Claim
15 words
A process as in claim 18 in which the organochromium compound comprises bis(indenyl) chromium [II].
Claim 22
Dependent Claim
15 words
A process as in claim 19 in which the organochromium compound comprises bis(fluorenyl) chromium [II].
Claim 23
Dependent Claim
25 words
A process as in claim 11 which is conducted in the presence of about 0.001 to 10 moles of hydrogen per mole of olefin monomer.
Claim 24
Dependent Claim
30 words
A process as in claim 21 in which said catalyst has been treated with about 0.05 to 10 moles of cyclopentadiene compound per mole of organochromium compound in said catalyst.
Claim 25
Dependent Claim
13 words
A process as in claim 22 in which said cyclopentadiene compound is cyclopentadiene.
References Cited (Backward Citations)
US3806500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |