US4362654A
Expired / Lapsed
US
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Chromium-containing catalysts for polymerizing olefins
Assignee: Dow Chemical Co
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Filing: 1981-05-14
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Granted: 1982-12-07
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Expires: 2001-05-14
Abstract
Abstract Inorganic oxide supported chromium-containing catalysts are improved by depositing the chromium onto the inorganic oxide support in the vapor phase rather than as an inorganic or organic compound. Polymers resulting from polymerizing one or more α-olefins in the presence of such catalysts exhibit a higher molecular weight as compared to those polymers prepared in the presence of such chromium-containing catalysts prepared in the conventional manner.
Inventors
- 👤 Fred L. Vance, Jr.
- 👤 Rafael E. Guerra
- 👤 Christopher P. Christenson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:22
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
46 words
In an inorganic oxide supported chromium-containing catalyst wherein said catalyst has been prepared by contacting said inorganic oxide support with zero valent chromium in the vapor state followed by activation in an oxidizing atmosphere at an elevated temperature for a time sufficient to activate the catalyst.
Claim 2
Dependent Claim
46 words
In an inorganic oxide supported chromium-containing catalyst wherein said catalyst has been prepared by contacting said inorganic oxide support with zero valent chromium in the vapor state followed by activation in an oxidizing atmosphere at an elevated temperature for a time sufficient to activate the catalyst.
Claim 3
Dependent Claim
43 words
The catalyst of claim 1 wherein the activation in an oxidizing atmosphere is conducted at a temperature of from about 300° C. to about 1000° C. and the chromium content of said supported catalyst is from about 0.01% to about 10% by weight.
Claim 4
Dependent Claim
43 words
The catalyst of claim 2 wherein the activation in an oxidizing atmosphere is conducted at a temperature of from about 400° C. to about 800° C. and the chromium content of said supported catalyst is from about 0.1% to about 5% by weight.
Claim 5
Dependent Claim
43 words
The catalyst of claim 3 wherein the activation in an oxidizing atmosphere is conducted at a temperature of from about 550° C. to about 750° C. and the chromium content of said supported catalyst is from about 0.25% to about 1% by weight.
Claim 6
Dependent Claim
42 words
The catalyst of claims 1, 2, 3 or 4 wherein said chromium is deposited on said support in the vapor phase (1) as an alloy with at least one other metal or (2) as a mixture with at least one other metal.
Claim 7
Dependent Claim
17 words
The catalyst of claim 5 wherein said other metal is nickel, titanium, zirconium, vanadium or mixture thereof.
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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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |