US4101722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process using spray dried titanium-containing catalyst
Assignee: Phillips Petroleum Co
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Filing: 1977-02-04
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Granted: 1978-07-18
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Expires: 1997-02-04
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
2026-10-24 04:03
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: 11
Claim 1
Independent Claim
99 words
A polymerization process which comprises contacting at least one monoolefin having 2-8 carbon atoms per molecule under polymerization conditions with a catalyst produced by 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 a said catalyst, said xerogel before calcining containing in addition 0.1 to 20 weight percent chromium calculated as CrO 3 based on the total weight of said catalyst.
Claim 2
Dependent Claim
99 words
A polymerization process which comprises contacting at least one monoolefin having 2-8 carbon atoms per molecule under polymerization conditions with a catalyst produced by 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 a said catalyst, said xerogel before calcining containing in addition 0.1 to 20 weight percent chromium calculated as CrO 3 based on the total weight of said catalyst.
Claim 3
Dependent Claim
27 words
A method according to claim 1 wherein said at least one monoolefin is ethylene and a comonomer selected from the group consisting of propylene, 1-butene, and 1-hexene.
Claim 4
Dependent Claim
21 words
A method according to claim 2 wherein said polymerization is carried out at a temperature within the range of 150°-230° F.
Claim 5
Dependent Claim
38 words
A method according to claim 3 wherein said hydrogel is formed by adding sodium silicate to sulfuric acid containing titanyl sulfate and wherein said chromium is incorporated by impregnating said xerogel with a solution of a chromium compound.
Claim 6
Dependent Claim
11 words
A method according to claim 4 wherein said comonomer is 1-hexene.
Claim 7
Dependent Claim
25 words
A method according to claim 1 wherein said hydrogel is formed by adding sodium silicate to sulfuric acid, which sulfuric acid contains a titanium compound.
Claim 8
Dependent Claim
22 words
A method according to claim 1 wherein said chromium is incorporated by impregnating said hydrogel with an aqueous solution of chromium compound.
Claim 9
Dependent Claim
22 words
A method according to claim 1 wherein said chromium is incorporated by impregnating said xerogel with a solution of a chromium compound.
Claim 10
Dependent Claim
26 words
A method 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 11
Dependent Claim
71 words
A method 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.
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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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |