US4016343A
Expired / Lapsed
US
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Tetravalent chromium alkoxide polymerization catalyst and method
Assignee: Chemplex Co
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Filing: 1975-08-22
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Granted: 1977-04-05
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Expires: 1995-08-22
Abstract
Abstract A catalyst for polymerizing one or more 1-olefins prepared by activating with a dry gas that contains oxygen a mixture of a finely divided support and a tetravalent alkoxide of chromium. The disclosure also includes the method of making the catalyst and methods of polymerizing olefins with the catalyst.
Inventors
- 👤 Raymond E. Hoff
- 👤 Mitsuzo Shida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:36
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
111 words
A catalyst for polymerizing one or more 1-olefins to a high density polymer, prepared by (1) forming a mixture of a finely divided support selected from the group consisting of silica, alumina, zirconia, thoria and composites thereof and at least one tetravalent alkoxide of chromium in an amount to give about 0.1-10 weight percent chromium on said support, said alkoxide being of the formula ##STR2## wherein R is hydrogen or an alkyl group of 1-6 carbon atoms, R' is an alkyl group of 1-6 carbon atoms and all R' may be the same or different, and (2) activating said mixture of support and alkoxide with a dry gas that contains oxygen.
Claim 2
Dependent Claim
111 words
A catalyst for polymerizing one or more 1-olefins to a high density polymer, prepared by (1) forming a mixture of a finely divided support selected from the group consisting of silica, alumina, zirconia, thoria and composites thereof and at least one tetravalent alkoxide of chromium in an amount to give about 0.1-10 weight percent chromium on said support, said alkoxide being of the formula ##STR2## wherein R is hydrogen or an alkyl group of 1-6 carbon atoms, R' is an alkyl group of 1-6 carbon atoms and all R' may be the same or different, and (2) activating said mixture of support and alkoxide with a dry gas that contains oxygen.
Claim 3
Dependent Claim
18 words
The catalyst of claim 1 wherein at least one R or R' is a hindered secondary alkyl group.
Claim 4
Dependent Claim
26 words
The catalyst of claim 1 wherein said support is initially dried by fluidizing with a dry gas inert to said support at a water expelling temperature.
Claim 5
Dependent Claim
30 words
he catalyst of claim 1 wherein said support is modified prior to (1) by mixing the support and a titanium compound and heating at a temperature of about 150°-1200° C.
Claim 6
Dependent Claim
25 words
The catalyst of claim 1 wherein said mixture is activated at a temperature of from about 200° C. to the sintering temperature of said support.
Claim 7
Dependent Claim
13 words
The catalyst of claim 5 wherein said temperature is from about 200°-1000° C.
Claim 8
Independent Claim
114 words
The method of making a catalyst for polymerizing one or more 1-olefins to a high density polymer, comprising: (1) forming a mixture of a finely divided support selected from the group consisting of silica, alumina, zirconia, thoria and composites thereof and at least one tetravalent alkoxide of chromium in an amount to give about 0.1-10 weight percent chromium on said support, said alkoxide being of the formula ##STR3## wherein R is hydrogen or an alkyl group of 1-6 carbon atoms, R' is an alkyl group of 1-6 carbon atoms and all R' may be the same or different, and (2) activating said mixture of support and alkoxide with a dry gas that contains oxygen.
Claim 9
Independent Claim
114 words
The method of making a catalyst for polymerizing one or more 1-olefins to a high density polymer, comprising: (1) forming a mixture of a finely divided support selected from the group consisting of silica, alumina, zirconia, thoria and composites thereof and at least one tetravalent alkoxide of chromium in an amount to give about 0.1-10 weight percent chromium on said support, said alkoxide being of the formula ##STR3## wherein R is hydrogen or an alkyl group of 1-6 carbon atoms, R' is an alkyl group of 1-6 carbon atoms and all R' may be the same or different, and (2) activating said mixture of support and alkoxide with a dry gas that contains oxygen.
Claim 10
Dependent Claim
18 words
The method of claim 7 wherein at least one R or R' is a hindered secondary alkyl group.
Claim 11
Dependent Claim
26 words
The method of claim 7 wherein said support is initially dried by fluidizing with a dry gas inert to said support at a water expelling temperature.
Claim 12
Dependent Claim
31 words
The method of claim 7 wherein said support is modified prior to (1) by mixing the support and a titanium compound and heating at a temperature of about 150°- 200° C.
Claim 13
Dependent Claim
30 words
The method of claim 7 wherein said mixture is activated at a temperature of from about 200° C. up to a temperature short of the sintering temperature of said support.
Claim 14
Dependent Claim
12 words
The method of claim 11 wherein said temperature is about 200°-1000° C.
Claim 15
Dependent Claim
28 words
The method of making polymers of one or more 1-olefins, comprising: polymerizing said olefin under polymerizing conditions with the catalyst of claim 1 and recovering the resulting polymer.
Claim 16
Dependent Claim
28 words
The method of making polymers of one or more 1-olefins, comprising: polymerizing said olefin under polymerizing conditions with the catalyst of claim 2 and recovering the resulting polymer.
Claim 17
Dependent Claim
28 words
The method of making polymers of one or more 1-olefins, comprising: polymerizing said olefin under polymerizing conditions with the catalyst of claim 3 and recovering the resulting polymer.
Claim 18
Dependent Claim
28 words
The method of making polymers of one or more 1-olefins, comprising: polymerizing said olefin under polymerizing conditions with the catalyst of claim 4 and recovering the resulting polymer.
Claim 19
Dependent Claim
28 words
The method of making polymers of one or more 1-olefins, comprising: polymerizing said olefin under polymerizing conditions with the catalyst of claim 5 and recovering the resulting polymer.
Claim 20
Dependent Claim
28 words
The method of making polymers of one or more 1-olefins, comprising: polymerizing said olefin under polymerizing conditions with the catalyst of claim 6 and recovering the resulting polymer.
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) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |