Patent US2537334A successfully refreshed from Google Patents.
US2537334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for emulsion polymerization of vinylidene compounds
Assignee: Shell Development Co
•
Filing: 1946-07-06
•
Granted: 1951-01-09
•
Expires: 1966-07-06
Abstract
No abstract record available.
Inventors
- 👤 Nie Willem Leendert Johanne De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:13
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
IN A PROCESS FOR PRODUCING AN AQUEOUS EMULSION OF POLYMER BY SUBJECTING A SUBSTANTIALLY WATER-INSOLUBLE POLYMERIZABLE VINYLIDENE COMPOUND TO POLYMERIZING CONDITIONS IN AQUEOUS EMULSION, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE POLYMERIZATION WITH THE MONOMER OF THE VINYLIDENE COMPOUND IN LIQUID PHASE WHILE ADDING ADDITIONAL LIQUID MONOMER OF SAID VINYLIDENE COMPOUND TO THE REACTION MIXTURE AT SUCH A RATE THAT THE CONCENTRATION OF THE LIQUID MONOMER IN THE REACTION MIXTURE IS MAINTAINED BELOW THAT AT WHICH THE FORMING POLYMER COAGULATES AND PRECIPITATES FROM THE EMULSION AND ABOVE 5% TO 7% BY WEIGHT OF THE REACTION MIXTURE, AND AFTER DISCONTINUING THE ADDITION OF THE LIQUID MONOMER TO THE REACTION MIXTURE CONTINUING THE POLYMERIZATION UNTIL THE MONOMER CONCENTRATION HAS DECREASED TO 5% TO 7% BY WEIGHT OF THE REACTION MIXTURE, BUT STOPPING THE POLYMERIZATION BEFORE THE MONOMER CONCENTRATION HAS DECREASED BELOW 5% TO 7% BY WEIGHT OF THE REACTION MIXTURE.
Claim 2
Dependent Claim
147 words
IN A PROCESS FOR PRODUCING AN AQUEOUS EMULSION OF POLYMER BY SUBJECTING A SUBSTANTIALLY WATER-INSOLUBLE POLYMERIZABLE VINYLIDENE COMPOUND TO POLYMERIZING CONDITIONS IN AQUEOUS EMULSION, THE IMPROVEMENT WHICH COMPRISES EFFECTING THE POLYMERIZATION WITH THE MONOMER OF THE VINYLIDENE COMPOUND IN LIQUID PHASE WHILE ADDING ADDITIONAL LIQUID MONOMER OF SAID VINYLIDENE COMPOUND TO THE REACTION MIXTURE AT SUCH A RATE THAT THE CONCENTRATION OF THE LIQUID MONOMER IN THE REACTION MIXTURE IS MAINTAINED BELOW THAT AT WHICH THE FORMING POLYMER COAGULATES AND PRECIPITATES FROM THE EMULSION AND ABOVE 5% TO 7% BY WEIGHT OF THE REACTION MIXTURE, AND AFTER DISCONTINUING THE ADDITION OF THE LIQUID MONOMER TO THE REACTION MIXTURE CONTINUING THE POLYMERIZATION UNTIL THE MONOMER CONCENTRATION HAS DECREASED TO 5% TO 7% BY WEIGHT OF THE REACTION MIXTURE, BUT STOPPING THE POLYMERIZATION BEFORE THE MONOMER CONCENTRATION HAS DECREASED BELOW 5% TO 7% BY WEIGHT OF THE REACTION MIXTURE.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |