US2543440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating polymers produced by alkali metal catalyzed polymerizations
Assignee: Phillips Petroleum Co
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Filing: 1949-04-11
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Granted: 1951-02-27
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Expires: 1969-04-11
Abstract
No abstract record available.
Inventors
- 👤 Willie W Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:34
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/02; C08C2/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A PROCESS FOR THE TREATMENT OF A LIQUID POLYBUTADIENE PRODUCED BY SOLUTION POLYMERIZATION OF 1,3-BUTADIENE IN THE PRESENCE OF AN ALKALI METAL CATALYST AND IN WHICH A RESULTING POLYBUTADIENE SOLUTION IS OBTAINED WHICH IS CONTAMINATED WITH ALKALI METAL, THE IMPROVEMENT WHICHH COMPRISES TREATING ABOUT 100 PARTS BY VOLUME OF THE RESULTING POLYBUTADIENE SOLUTION WITH A MIXTURE COMPRISING ABOUT 25 PARTS BY VOLUME OF AN ALCOHOL CONTAINING NOT MORE THAN 4 CARBON ATOMS PER MOLECULE AND 25 PARTS BY VOLUME OF A WATER SOLUTION CONTAINING A SUFFICIENT AMOUNT OF A MINERAL ACID TO MAINTAIN THE PH OF SAID MIXTURE IN THE RANGE OF FROM 6.5 TO 0.1 AND ABOUT FIVE WEIGHT PER CENT OF AN ALKALI METAL SALT, THEREBY REMOVING ALKALI METAL FROM SAID POLYBUTADIENE.
Claim 2
Dependent Claim
125 words
IN A PROCESS FOR THE TREATMENT OF A LIQUID POLYBUTADIENE PRODUCED BY SOLUTION POLYMERIZATION OF 1,3-BUTADIENE IN THE PRESENCE OF AN ALKALI METAL CATALYST AND IN WHICH A RESULTING POLYBUTADIENE SOLUTION IS OBTAINED WHICH IS CONTAMINATED WITH ALKALI METAL, THE IMPROVEMENT WHICHH COMPRISES TREATING ABOUT 100 PARTS BY VOLUME OF THE RESULTING POLYBUTADIENE SOLUTION WITH A MIXTURE COMPRISING ABOUT 25 PARTS BY VOLUME OF AN ALCOHOL CONTAINING NOT MORE THAN 4 CARBON ATOMS PER MOLECULE AND 25 PARTS BY VOLUME OF A WATER SOLUTION CONTAINING A SUFFICIENT AMOUNT OF A MINERAL ACID TO MAINTAIN THE PH OF SAID MIXTURE IN THE RANGE OF FROM 6.5 TO 0.1 AND ABOUT FIVE WEIGHT PER CENT OF AN ALKALI METAL SALT, THEREBY REMOVING ALKALI METAL FROM SAID POLYBUTADIENE.
References Cited (Backward Citations)
GB545193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-26 | 1954-08-28 | 1955-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-26 | 1958-08-28 | 1959-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-26 | 1962-08-28 | 1963-02-27 | $7700.00 | Window Closed / Lapsed |