Patent US4035561A successfully refreshed from Google Patents.
US4035561A
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US
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Method of polymerizing
Assignee: Chemplex Co
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Filing: 1976-03-01
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Granted: 1977-07-12
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Expires: 1996-03-01
Abstract
Abstract A method of polymerizing a monomer comprising ethylene in which a catalyst used is prepared by dispersing on a dry, finely divided, difficultly reducible inorganic oxide support such as silica a reaction product prepared by reacting pinacol with a chromium compound in which the reaction product is fixed to the support by heating at an elevated temperature in a non-oxidizing atmosphere.
Inventors
- 👤 Raymond E. Hoff
- 👤 Mitsuzo Shida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:30
CPC Classifications
C; C08; C08F; C08F110/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
The method of polymerizing a monomer charge comprising 1-olefins of 2-8 carbon atoms or a copolymerizable mixture of one of these with C 2 -C 20 olefins which comprises contacting said charge under polymerizing conditions with a catalyst prepared by dispersing on a dry, finely divided, difficultly reducible, inorganic oxide support a reaction product prepared by reacting pinacol with a chromium compound in a molar ratio of 2-4 pinacol to 1 chromium compound, said chromium compound being of the class consisting of chromium tetra-tertiary-butoxide, ditertiary-butyl chromate, ammonium chromate and ammonium dichromate, the reaction product being fixed to said support and the resulting catalyst activated by heating to a final activation temperature of about 400°-1100° C. in a non-oxidizing atmosphere, said reaction product being present in an amount of about 0.001- 10 wt.% and said support being present in an amount of about 99.999-90 wt.%.
Claim 2
Independent Claim
144 words
The method of polymerizing a monomer charge comprising 1-olefins of 2-8 carbon atoms or a copolymerizable mixture of one of these with C 2 -C 20 olefins which comprises contacting said charge under polymerizing conditions with a catalyst prepared by dispersing on a dry, finely divided, difficultly reducible, inorganic oxide support a reaction product prepared by reacting pinacol with a chromium compound in a molar ratio of 2-4 pinacol to 1 chromium compound, said chromium compound being of the class consisting of chromium tetra-tertiary-butoxide, ditertiary-butyl chromate, ammonium chromate and ammonium dichromate, the reaction product being fixed to said support and the resulting catalyst activated by heating to a final activation temperature of about 400°-1100° C. in a non-oxidizing atmosphere, said reaction product being present in an amount of about 0.001- 10 wt.% and said support being present in an amount of about 99.999-90 wt.%.
Claim 3
Dependent Claim
10 words
The method of claim 1 wherein said olefin comprises ethylene.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein said reaction product of pinacol and the chromium compound is first prepared and then dispersed on said inorganic support.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein said support is a member of the class consisting of silica, titania, alumina, thoria, zirconia and mixtures thereof.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said reaction product is prepared by adding the pinacol and said chromium compound to said support and then reacting by heating the materials to a reaction temperature.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein said inorganic support comprises finely divided silica.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |