US2636910A
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: 1949-04-22
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Granted: 1953-04-28
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Expires: 1969-04-22
Abstract
No abstract record available.
Inventors
- 👤 Willie W Crouch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:35
CPC Classifications
C; C08; C08C; C08C2/00; C08C2/02; C08C2/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 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 WHICH IS DISCOLORED BY RESULTING ORGANIC COMPOUNDS OF SAID ALKALI METAL, THE IMPROVEMENT WHICH COMPRISES TREATING ABOUT 100 PARTS BY WEIGHT OF SAID POLYBUTADIENE DISSOLVED IN A PARAFFINIC SOLVENT CONTAINING AT LEAST FIVE AND NOT MORE THAN EIGHT CARBON ATOMS PER MOLECULE WITH A MATERIAL CONSISTING ESSENTIALLY OF FROM 0.1 TO 30 PARTS BY WEIGHT OF SULFUR DIOXIDE, THEREBY CONVERTING THE ALKALI METAL AND ALKALI METAL-ORGANIC COMPOUNDS CONTAINED IN SAID POLYBUTADIENE TO A COLORLESS FORM.
Claim 2
Dependent Claim
100 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 WHICH IS DISCOLORED BY RESULTING ORGANIC COMPOUNDS OF SAID ALKALI METAL, THE IMPROVEMENT WHICH COMPRISES TREATING ABOUT 100 PARTS BY WEIGHT OF SAID POLYBUTADIENE DISSOLVED IN A PARAFFINIC SOLVENT CONTAINING AT LEAST FIVE AND NOT MORE THAN EIGHT CARBON ATOMS PER MOLECULE WITH A MATERIAL CONSISTING ESSENTIALLY OF FROM 0.1 TO 30 PARTS BY WEIGHT OF SULFUR DIOXIDE, THEREBY CONVERTING THE ALKALI METAL AND ALKALI METAL-ORGANIC COMPOUNDS CONTAINED IN SAID POLYBUTADIENE TO A COLORLESS FORM.
References Cited (Backward Citations)
GB545193A
Cited
US2466694A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |