US2977351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of polyolefin by precipitation in water
Assignee: Phillips Petroleum Co
•
Filing: 1956-06-28
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Granted: 1961-03-28
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Expires: 1976-06-28
Abstract
No abstract record available.
Inventors
- 👤 Fred E Wiley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/16; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR RECOVERING POLYETHYLENE FROM SOLUTION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PARAFFINS AND CYCLOPARAFFINS, SAID PROCESS COMPRISING DISPERSING SAID SOLUTION AS FINE DROPLETS INTO WATER AT A RATIO WITHIN THE RANGE OF 1 TO 10 VOLUMES WATER PER VOLUME OF SOLUTION, SAID WATER BEING ABOVE THE PRECIPITATION TEMPERATURE OF POLYETHYLENE, COOLING THE RESULTING SOLUTION IN WATER DISPERSION TO BELOW THE PRECIPITATION TEMPERATURE OF POLYETHYLENE, MAINTAINING THE PRESSURE ON THE DISPERSION ZONE AND COOLING ZONE SUFFICIENTLY HIGH TO MAINTAIN SAID SOLVENT AND SAID WATER IN LIQUID PHASE UNIT SAID POLYETHYLENE IS SUBSTANTIALLY PRECIPITATED, STEAM STRIPPING THE SOLVENT FROM THE WATER AND POLYMER AND THEREAFTER RECOVERING THE POLYMER FROM THE RESULTING WATER DISPERSION THEREOF.
Claim 2
Dependent Claim
117 words
A PROCESS FOR RECOVERING POLYETHYLENE FROM SOLUTION IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF PARAFFINS AND CYCLOPARAFFINS, SAID PROCESS COMPRISING DISPERSING SAID SOLUTION AS FINE DROPLETS INTO WATER AT A RATIO WITHIN THE RANGE OF 1 TO 10 VOLUMES WATER PER VOLUME OF SOLUTION, SAID WATER BEING ABOVE THE PRECIPITATION TEMPERATURE OF POLYETHYLENE, COOLING THE RESULTING SOLUTION IN WATER DISPERSION TO BELOW THE PRECIPITATION TEMPERATURE OF POLYETHYLENE, MAINTAINING THE PRESSURE ON THE DISPERSION ZONE AND COOLING ZONE SUFFICIENTLY HIGH TO MAINTAIN SAID SOLVENT AND SAID WATER IN LIQUID PHASE UNIT SAID POLYETHYLENE IS SUBSTANTIALLY PRECIPITATED, STEAM STRIPPING THE SOLVENT FROM THE WATER AND POLYMER AND THEREAFTER RECOVERING THE POLYMER FROM THE RESULTING WATER DISPERSION THEREOF.
References Cited (Backward Citations)
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Cited
US2530144A
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GB609560A
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US2537130A
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US2719143A
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US2766224A
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US2731452A
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US2838477A
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US2858902A
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |