Patent US4708474A successfully refreshed from Google Patents.
US3227701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylation and acidification of polymers
Assignee: Phillips Petroleum Co
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Filing: 1962-05-29
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Granted: 1966-01-04
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Expires: 1982-05-29
Abstract
No abstract record available.
Inventors
- 👤 Edward N Pennington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:21
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN THE PROCESS OF CARBOXYLATING AND ACIDIFYING A SOLUTION OF CONJUGATED DIENE POLYMER WHEREIN CARBOXYLATION CAUSES AN INCREASE IN VISCOSITY OF THE SOLUTION AND WHEREIN ACIDIFICATION OF THE THUS-CARBOXYLATED SOLUTION EFFECTS A DECREASED IN SOLUTION VISCOSITY, THE IMPROVEMENT COMPRISING EFFECTING BOTH THE CARBOXYLATION AND THE ACIDIFICATION IN A SINGLE ZONE WHEREIN THERE IS MAINTAINED A GASEOUS ATMOSPHERE COMPRISING CARBON DIOXIDE ABOVE A LIQUID BODY COMPRISING AN ALKALI METAL TERMINATED POLYMER SOLUTION, THE CARBOXYLATION AND ACIDIFICATION BEING EFFECTED IN THE FOLLOWING STEPS: (A) INTRODUCING A SOLUTION OF AN ALKALI METAL TERMINATED CONJUGATED DIENE POLYMER INTO THE GASEOUS ATMOSPHERE OF SAID ZONE IN A FINELY DIVIDED FORM, (B) INTRODUCING AN ACIDIFYING AGENT INTO THE LIQUID BODY OF SAID ZONE, (C) WITHDRAWING AS PRODUCT FROM SAID ZONE A SOLUTION OF CARBOXYLATED AND ACIDIFIED POLYMER, AND (D) REPLACING SAID GASEOUS ATMOSPHERE COMPRISING CARBON DIOXIDE.
Claim 2
Dependent Claim
140 words
IN THE PROCESS OF CARBOXYLATING AND ACIDIFYING A SOLUTION OF CONJUGATED DIENE POLYMER WHEREIN CARBOXYLATION CAUSES AN INCREASE IN VISCOSITY OF THE SOLUTION AND WHEREIN ACIDIFICATION OF THE THUS-CARBOXYLATED SOLUTION EFFECTS A DECREASED IN SOLUTION VISCOSITY, THE IMPROVEMENT COMPRISING EFFECTING BOTH THE CARBOXYLATION AND THE ACIDIFICATION IN A SINGLE ZONE WHEREIN THERE IS MAINTAINED A GASEOUS ATMOSPHERE COMPRISING CARBON DIOXIDE ABOVE A LIQUID BODY COMPRISING AN ALKALI METAL TERMINATED POLYMER SOLUTION, THE CARBOXYLATION AND ACIDIFICATION BEING EFFECTED IN THE FOLLOWING STEPS: (A) INTRODUCING A SOLUTION OF AN ALKALI METAL TERMINATED CONJUGATED DIENE POLYMER INTO THE GASEOUS ATMOSPHERE OF SAID ZONE IN A FINELY DIVIDED FORM, (B) INTRODUCING AN ACIDIFYING AGENT INTO THE LIQUID BODY OF SAID ZONE, (C) WITHDRAWING AS PRODUCT FROM SAID ZONE A SOLUTION OF CARBOXYLATED AND ACIDIFIED POLYMER, AND (D) REPLACING SAID GASEOUS ATMOSPHERE COMPRISING CARBON DIOXIDE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |