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US3676417A
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US
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Polymerization using a supported chromia activated with a tin on gallium compound
Assignee: Phillips Petroleum Co
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Filing: 1971-02-25
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Granted: 1972-07-11
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Expires: 1991-02-25
Abstract
Abstract A catalyst is formed by combining a support material with (1) a chromium-containing compound such as chromium trioxide and (2) at least one of a gallium-containing compound such as gallium isopropoxide, and a tin-containing compound such as tin isopropoxide, and then activating the catalyst by heating at a temperature of at least 1,700* F. Polymers such as polyethylene formed using the catalyst of this invention have a narrow molecular weight distribution.
Inventors
- 👤 Bertalan Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:55
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
A process according to claim 1 wherein said mono-1-olefin is selected from those having from two to eight carbon atoms per molecule and said chromium-containing compound is chromium oxide.
Claim 2
Dependent Claim
51 words
A process according to claim 1 wherein the polymerization conditions comprise: a temperature range from about 100* to about 500* F, a pressure range from about 100 to about 700 psi, and a catalyst concentration of from about 0.001 to about 10 weight percent based upon the weight of reactor contents.
Claim 3
Dependent Claim
37 words
A process according to claim 1 wherein the polymerization catalyst comprises chromium trioxide, the compound having the formula Ga(OR)m is gallium isopropoxide, the compound having the formula Sn(OR'')n is stannic isopropoxide, and the support material is silica-alumina.
Claim 4
Dependent Claim
10 words
A process according to claim 4 wherein mono-1-olefin is ethylene.
References Cited (Backward Citations)
CA691381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |