US3287286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous production of finely particled expandable styrene polymers
Assignee: BASF SE
•
Filing: 1963-08-20
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Granted: 1966-11-22
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Expires: 1983-08-20
Abstract
No abstract record available.
Inventors
- 👤 Ohlinger Helmut
- 👤 Guenther Wolfgang
- 👤 Single Winfried
- 👤 Buchholz Karl
- 👤 Wild Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:31
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08F; C08F279/00; C08F279/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
A PROCESS FOR THE PRODUCTION OF FINELY PARTICLED EXPANDABLE POLYSTYRENE WHEREIN STYRENE AND AN ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC HYDROCARBONS AND PERCHLOROFLUOROCARBONS WHICH HAS A BOILING POINT LOWER THAN THE SOFTENING POINT OF POLYSTYRENE, BUT ABOVE -45*C. IS CONTINUOUSLY INTRODUCED AT THE TOP OF A PRESSURE VESSEL HAVING A DIAMETER LESS THAN ITS HEIFHT, THE STYRENE IS POLYMERIZED WITH THE TEMPERATURE AT THE TOP OF THE PRESSURE VESSEL BEING BETWEEN 70* AND 130*C. AND AT THE BOTTOM BETWEEN 170* AND 230*C. AND THE PRESSURE IN THE PRESSURE VESSEL BEING MORE THAN THE VAPOR PRESSURE OF THE ORGANIC COMPOUND AND STYRENE AT THE TEMPERATURE PREVAILING AT THE BOTTOM OF THE VESSEL, THE COMPOSITION COMPRISING POLYSTYRENE AND ORGANIC COMPOUND IS CONTINUALLY DISCHARGED AT THE BOTTOM OF THE PRESSURE VESSEL AT A RATE EQUIVALENT TO THAT AT WHICH THE STYRENE AND ORGANIC COMPOUND ARE SUPPLIED AT THE TOP OF THE PRESSURE VESSEL, AND THE COMPOSITION IS COOLED TO 20* TO 65* C. AND THEN REDUCED IN SIZE.
Claim 2
Dependent Claim
168 words
A PROCESS FOR THE PRODUCTION OF FINELY PARTICLED EXPANDABLE POLYSTYRENE WHEREIN STYRENE AND AN ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC HYDROCARBONS AND PERCHLOROFLUOROCARBONS WHICH HAS A BOILING POINT LOWER THAN THE SOFTENING POINT OF POLYSTYRENE, BUT ABOVE -45*C. IS CONTINUOUSLY INTRODUCED AT THE TOP OF A PRESSURE VESSEL HAVING A DIAMETER LESS THAN ITS HEIFHT, THE STYRENE IS POLYMERIZED WITH THE TEMPERATURE AT THE TOP OF THE PRESSURE VESSEL BEING BETWEEN 70* AND 130*C. AND AT THE BOTTOM BETWEEN 170* AND 230*C. AND THE PRESSURE IN THE PRESSURE VESSEL BEING MORE THAN THE VAPOR PRESSURE OF THE ORGANIC COMPOUND AND STYRENE AT THE TEMPERATURE PREVAILING AT THE BOTTOM OF THE VESSEL, THE COMPOSITION COMPRISING POLYSTYRENE AND ORGANIC COMPOUND IS CONTINUALLY DISCHARGED AT THE BOTTOM OF THE PRESSURE VESSEL AT A RATE EQUIVALENT TO THAT AT WHICH THE STYRENE AND ORGANIC COMPOUND ARE SUPPLIED AT THE TOP OF THE PRESSURE VESSEL, AND THE COMPOSITION IS COOLED TO 20* TO 65* C. AND THEN REDUCED IN SIZE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |