US3986983A
Expired / Lapsed
US
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Catalyst and method of polymerizing
Assignee: Chemplex Co
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Filing: 1974-10-24
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Granted: 1976-10-19
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Expires: 1994-10-24
Abstract
Abstract A catalyst and a method of polymerizing a monomer comprising ethylene in which the catalyst 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 08:59
CPC Classifications
C; C08; C08F; C08F110/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
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 simultaneously fixed to said support and the resulting catalyst activated by heating at an elevated reaction and activating temperature up to a maximum 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. percent and said support being present in an amount of about 99.999-90 wt. percent.
Claim 2
Dependent Claim
117 words
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 simultaneously fixed to said support and the resulting catalyst activated by heating at an elevated reaction and activating temperature up to a maximum 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. percent and said support being present in an amount of about 99.999-90 wt. percent.
Claim 3
Dependent Claim
19 words
The catalyst of claim 1 wherein said reaction product is first prepared and then dispersed on said inorganic support.
Claim 4
Dependent Claim
24 words
The catalyst of claim 1 wherein said support is a member of the class consisting of silica, titania, alumina, thoria, zirconia and mixtures thereof.
Claim 5
Dependent Claim
26 words
The catalyst of claim 1 wherein said reaction product is prepared by adding the pinacol and said chromium compound to said support followed by said heating.
Claim 6
Dependent Claim
13 words
The catalyst of claim 1 wherein said inorganic support comprises finely divided silica.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |