US3751402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the recovery of rubbery polymers in crumb form
Assignee: Millennium Petrochemicals Inc
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Filing: 1971-06-01
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Granted: 1973-08-07
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Expires: 1991-06-01
Abstract
Abstract A PROCESS IS PROVIDED FOR THE PREPARATION OF RUBBERY POLYMERS IN SATISFACTORY CRUMB FORM THAT CAN BE READILY HANDLED AND PROCESSED, FROM A POLYMER FORMED IN A REACTION SOLUTION IN AN INERT, VOLATILE, NONAQUEOUS SOLVENT, IN THE PRESENCE OF AN ALKALI METAL CATALYST WHICH HYDROLYZES IN WATER TO FORM AN ALKALINE SOLUTION. THE PROCESS COMPRISES PRECIPITATING THE POLYMER FROM THE REACTION SOLUTION IN THE PRESENCE OF WATER BY SUBJECTING THE POLYMER SOLUTION TO STEAM-STRIPPING TO VOLATILIZE AND REMOVE UNREACTED MONOMER, VOLATILE LOW POLYMER AND SOLVENT IN THE PRESENCE OF AN ANIONOC SURFACTANT AND A NONIONIC SURFACTANT AND THEREAFTER RECOVERING THE RUBBERY POLYMER CRUMB.
Inventors
- 👤 L Broering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:55
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08C; C08C2/00; C08C2/06; C08F10/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 0
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |