Patent US3412148A successfully refreshed from Google Patents.
US3412148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of hexafluoropropylene oxide
Assignee: EIDP Inc
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Filing: 1966-05-02
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Granted: 1968-11-19
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Expires: 1986-05-02
Abstract
No abstract record available.
Inventors
- 👤 Arbogast Frederick Lowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:22
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/22; C08G65/223; C08G65/226; B; B01; B01J; B01J19/00; B01J19/18; B01J19/1862; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00076; B01J2219/00083; B01J2219/00105; B01J2219/00108; B01J2219/00162; B01J2219/00182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
206 words
A PROCESS FOR THE POLYMERIZATION OF HEXAFLUOROPROPYLENE OXIDE TO POLYMERS HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 5500 WHICH COMPRISES (A) MAINTAINING A PLURALITY OF REACTION ZONES WHEREIN NOT MORE THAN 67% OF THE TOTAL REACTION VOLUME IS IN THE FIRST REACTOR ZONE, (B) CONTINUOUSLY CHARGING HEXAFLUOROPROPYLENE OXIDE AND AN ALKALI METAL FLUORIDE LIQUID CATALYST COMPOSITION TO THE FIRST REACTION ZONE AT THE RATE OF 75 TO 225 MOLES OF HEXAFLUOROPROPYLENE OXIDE PER MOLE OF ALKALI METAL FLUORIDE, SAID LIQUID CATALYST COMPOSITION BEING PREPARED BY (1) MIXING AN ALKALI METAL FLUORIDE WITH AT LEAST AN EQUAL WEIGHT OF AN ETHYLENE GLYCOL DIMETHYL ETHER OF THE FORMULA, CH3O$CH2CH2O$NCH3, WHEREIN N IS 1 TO 4, AND (2) REACTING THE ALKALI METAL FLUORIDE WITH 2 TO 3 MOLES OF HEXAFLUOROPROPYLENE OXIDE PER MOLE OF ALKALI METAL FLUORIDE, (C) PASSING THE REACTION MASS SEQUENTIALLY THROUGH THE PLURALITY OF REACTION ZONES WHILE MAINTAINING THE REACTION MASS UNDER AGITATION AT A TEMPERATURE OF -45* TO -10*C. UNTIL AT LEAST 85% OF THE HEXAFLUOROPROPYLENE OXIDE HAS BEEN CONVERTED TO POLYMER, AND (D) CONTINUOUSLY WITHDRAWING CRUDE REACTION PRODUCT FROM THE FINAL REACTION ZONE AND SEPARATING A POLYMER FRACTION HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 5500 AS A PRODUCT OF THE PROCESS.
Claim 2
Dependent Claim
206 words
A PROCESS FOR THE POLYMERIZATION OF HEXAFLUOROPROPYLENE OXIDE TO POLYMERS HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 5500 WHICH COMPRISES (A) MAINTAINING A PLURALITY OF REACTION ZONES WHEREIN NOT MORE THAN 67% OF THE TOTAL REACTION VOLUME IS IN THE FIRST REACTOR ZONE, (B) CONTINUOUSLY CHARGING HEXAFLUOROPROPYLENE OXIDE AND AN ALKALI METAL FLUORIDE LIQUID CATALYST COMPOSITION TO THE FIRST REACTION ZONE AT THE RATE OF 75 TO 225 MOLES OF HEXAFLUOROPROPYLENE OXIDE PER MOLE OF ALKALI METAL FLUORIDE, SAID LIQUID CATALYST COMPOSITION BEING PREPARED BY (1) MIXING AN ALKALI METAL FLUORIDE WITH AT LEAST AN EQUAL WEIGHT OF AN ETHYLENE GLYCOL DIMETHYL ETHER OF THE FORMULA, CH3O$CH2CH2O$NCH3, WHEREIN N IS 1 TO 4, AND (2) REACTING THE ALKALI METAL FLUORIDE WITH 2 TO 3 MOLES OF HEXAFLUOROPROPYLENE OXIDE PER MOLE OF ALKALI METAL FLUORIDE, (C) PASSING THE REACTION MASS SEQUENTIALLY THROUGH THE PLURALITY OF REACTION ZONES WHILE MAINTAINING THE REACTION MASS UNDER AGITATION AT A TEMPERATURE OF -45* TO -10*C. UNTIL AT LEAST 85% OF THE HEXAFLUOROPROPYLENE OXIDE HAS BEEN CONVERTED TO POLYMER, AND (D) CONTINUOUSLY WITHDRAWING CRUDE REACTION PRODUCT FROM THE FINAL REACTION ZONE AND SEPARATING A POLYMER FRACTION HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 5500 AS A PRODUCT OF THE PROCESS.
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) | 1971-11-19 | 1972-05-20 | 1972-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-19 | 1976-05-20 | 1976-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-19 | 1980-05-20 | 1980-11-19 | $7700.00 | Window Closed / Lapsed |