US2496653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous bulk polymerization of styrene
Assignee: Union Carbide Corp
•
Filing: 1943-10-12
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Granted: 1950-02-07
•
Expires: 1963-10-12
Abstract
No abstract record available.
Inventors
- 👤 Jr Ivey Allen
- 👤 Walter R Marshall
- 👤 Gordon E Wightman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:50
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/18; C; C08; C08F; C08F2/00; C08F2/36; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00063; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00159; B01J2219/00168; Y; Y10; Y10S; Y10S526/00; Y10S526/918
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
A CONTINUOUS PROCESS FOR POLYMERIZING STYRENE MONOMER IN A CLOSED SYSTEM WHICH COMPRISES INITIATING POLYMERIZATION BY HEATING THE STYRENE MONOMER TO ABOUT 100*C. IN A FIRST ENCLOSED HEATING ZONE, CONTINUOUSLY AGITATING AND CONTROLLING THE TEMPERATURE OF THE POLYMERIZING MONOMER IN SAID ZONE BETWEEN ABOUT 100* AND 125*C. TO FORM A MIXTURE OF STYRENE POLYMERS AND UNPOLYMERIZED MONOMER, CONTINUOUSLY REMOVING A PORTION OF THE MIXTURE FROM SAID FIRST HEATING ZONE AND TRANSFERRING SAID PORTION TO A SECOND ENCLOSED HEATING ZONE WHILE REPLENISHING THE FIRST HEATING ZONE WITH MORE STYRENE MONOMER, CONTINUOUSLY MOVING SAID PORTION THROUGH THE SECOND HEATING ZONE AND PLYMERIZING MORE OF THE MONOMER IN THE MIXTURE BY HEATING TO HIGHER TEMPERATURES OF UP TO ABOUT 175*C., CONTINUOUSLY REMOVING FROM THE SECOND HEATING ZONE A POLYMERIZED MASS OF UPWARDS OF ABOUT 85 PERCENT SOLIDS, INCREASING THE TEMPERATURE OF THE MASS REMOVED FROM THE SECOND ZONE TO ABOUT 200* TO 225*C., AND THEN REMOVING VOLATILE MATTER FROM THE MASS BY MILLING IT IN CONTACT WITH A MOVING STREAM OF GAS AT LESS THAN ATMOSPHERIC PRESSURE TO CARRY OFF THE RELEASE VOLATILE MATTER UNTIL THE MASS HAS A METHANOL-SOLUBLE CONTENT
Claim 2
Dependent Claim
188 words
A CONTINUOUS PROCESS FOR POLYMERIZING STYRENE MONOMER IN A CLOSED SYSTEM WHICH COMPRISES INITIATING POLYMERIZATION BY HEATING THE STYRENE MONOMER TO ABOUT 100*C. IN A FIRST ENCLOSED HEATING ZONE, CONTINUOUSLY AGITATING AND CONTROLLING THE TEMPERATURE OF THE POLYMERIZING MONOMER IN SAID ZONE BETWEEN ABOUT 100* AND 125*C. TO FORM A MIXTURE OF STYRENE POLYMERS AND UNPOLYMERIZED MONOMER, CONTINUOUSLY REMOVING A PORTION OF THE MIXTURE FROM SAID FIRST HEATING ZONE AND TRANSFERRING SAID PORTION TO A SECOND ENCLOSED HEATING ZONE WHILE REPLENISHING THE FIRST HEATING ZONE WITH MORE STYRENE MONOMER, CONTINUOUSLY MOVING SAID PORTION THROUGH THE SECOND HEATING ZONE AND PLYMERIZING MORE OF THE MONOMER IN THE MIXTURE BY HEATING TO HIGHER TEMPERATURES OF UP TO ABOUT 175*C., CONTINUOUSLY REMOVING FROM THE SECOND HEATING ZONE A POLYMERIZED MASS OF UPWARDS OF ABOUT 85 PERCENT SOLIDS, INCREASING THE TEMPERATURE OF THE MASS REMOVED FROM THE SECOND ZONE TO ABOUT 200* TO 225*C., AND THEN REMOVING VOLATILE MATTER FROM THE MASS BY MILLING IT IN CONTACT WITH A MOVING STREAM OF GAS AT LESS THAN ATMOSPHERIC PRESSURE TO CARRY OFF THE RELEASE VOLATILE MATTER UNTIL THE MASS HAS A METHANOL-SOLUBLE CONTENT
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |