US4053436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spray dried titanium-containing catalyst for stress crack resistant polymer
Assignee: Phillips Petroleum Co
•
Filing: 1975-08-26
•
Granted: 1977-10-11
•
Expires: 1995-08-26
Abstract
Abstract A chromium-containing catalyst utilizing spray dried silica gel containing titanium is used to produce olefin polymers exhibiting an outstanding resistance to environmental stress cracking.
Inventors
- 👤 John P. Hogan
- 👤 Donald D. Norwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:15
CPC Classifications
C; C08; C08F; C08F10/00; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26; B01J37/00; B01J37/02; B01J37/03; C08F210/00; C08F210/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A catalyst produced by a process comprising forming a hydrogel by contacting an alkali metal silicate with a material selected from the group consisting of acids, acidic salts, and carbon dioxide, said hydrogel having coprecipitated therewith a titanium compound; spray drying said thus-formed hydrogel to form a xerogel; thereafter calcining said xerogel to form said catalyst, said catalyst containing in addition 0.1 to 20 wt. % chromium calculated as CrO 3 based on the total weight of said catalyst.
Claim 2
Dependent Claim
79 words
A catalyst produced by a process comprising forming a hydrogel by contacting an alkali metal silicate with a material selected from the group consisting of acids, acidic salts, and carbon dioxide, said hydrogel having coprecipitated therewith a titanium compound; spray drying said thus-formed hydrogel to form a xerogel; thereafter calcining said xerogel to form said catalyst, said catalyst containing in addition 0.1 to 20 wt. % chromium calculated as CrO 3 based on the total weight of said catalyst.
Claim 3
Dependent Claim
25 words
The catalyst according to claim 1 wherein said hydrogel is formed by adding sodium silicate to sulfuric acid, which sulfuric acid contains a titanium compound.
Claim 4
Dependent Claim
13 words
A catalyst according to claim 2 wherein said titanium compound is titanyl sulfate.
Claim 5
Dependent Claim
23 words
A catalyst according to claim 1 wherein said chromium is incorporated by impregnating said hydrogel with an aqueous solution of a chromium compound.
Claim 6
Dependent Claim
22 words
A catalyst according to claim 1 wherein said chromium is incorporated by impregnating said xerogel with a solution of a chromium compound.
Claim 7
Dependent Claim
26 words
A catalyst according to claim 1 wherein said chromium is incorporated by including a chromium compound in said acid so as to form a tergel hydrogel.
Claim 8
Dependent Claim
70 words
A catalyst according to claim 1 wherein said hydrogel is produced by adding sodium silicate to sulfuric acid which sulfuric acid contains titanyl sulfate, aging said thus formed hydrogel at an elevated temperature and washing to remove sodium ions; said chromium is incorporated by impregnating said xerogel with an aqueous solution of CrO 3 ; and said calcining is carried out at a temperature within the range of 900°-1700° F.
References Cited (Backward Citations)
US3523912A
Cited
US3887494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |