US2845410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fractionation of polymers
Assignee: Phillips Petroleum Co
•
Filing: 1954-10-01
•
Granted: 1958-07-29
•
Expires: 1974-10-01
Abstract
No abstract record available.
Inventors
- 👤 Vault Albert N De
- 👤 William N Axe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:10
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A PROCESS FOR FRACTIONATING A POLYMER WHICH IS AT LEAST PARTIALLY SOLUBLE IN ISOBUTANE AT CONDITIONS SUBSEQUENTLY DESCRIBED HEREIN AND WHICH IS RESOLVABLE INTO A VISCOUS OILY FRACTION, A TACKY FRACTION AND A NORMALLY SOLID FRACTION WHICH PROCESS COMPRISES CONTACTING SAID POLYMER WITH ISOBUTANE IN A FIRST ZONE AT A TEMPERATURE IN THE RANGE 240 TO 260*F., FORMING AN ISOBUTANE-RICH PHASE AND A POLYMER-RICH PHASE, RECOVERING SAID OILY FRACTION FROM SAID ISOBUTANE-RICH PHASE, ADDING A HYDROCARBON HAVING FROM 7 TO 9 CARBON ATOMS PER MOLECULE TO SAID POLYMER RICH PHASE, CONTACTING THE RESULTING MIXTURE WITH ISOBUTANE IN A SECOND ZONE AT A TEMPERATURE IN THE RANGE 240 TO 260*F. TO FORM A LIQUID PHASE CONTAINING MOST OF SAID TACKY FRACTION AND A LIQUID PHASE CONTAINING MOST OF SAID NORMALLY SOLID FRACTION, SEPARATELY COLLECTING THE LATTERMENTIONED PHASES, AND RECOVERING A POLYMER FRACTION FROM EACH PHASE.
Claim 2
Dependent Claim
144 words
A PROCESS FOR FRACTIONATING A POLYMER WHICH IS AT LEAST PARTIALLY SOLUBLE IN ISOBUTANE AT CONDITIONS SUBSEQUENTLY DESCRIBED HEREIN AND WHICH IS RESOLVABLE INTO A VISCOUS OILY FRACTION, A TACKY FRACTION AND A NORMALLY SOLID FRACTION WHICH PROCESS COMPRISES CONTACTING SAID POLYMER WITH ISOBUTANE IN A FIRST ZONE AT A TEMPERATURE IN THE RANGE 240 TO 260*F., FORMING AN ISOBUTANE-RICH PHASE AND A POLYMER-RICH PHASE, RECOVERING SAID OILY FRACTION FROM SAID ISOBUTANE-RICH PHASE, ADDING A HYDROCARBON HAVING FROM 7 TO 9 CARBON ATOMS PER MOLECULE TO SAID POLYMER RICH PHASE, CONTACTING THE RESULTING MIXTURE WITH ISOBUTANE IN A SECOND ZONE AT A TEMPERATURE IN THE RANGE 240 TO 260*F. TO FORM A LIQUID PHASE CONTAINING MOST OF SAID TACKY FRACTION AND A LIQUID PHASE CONTAINING MOST OF SAID NORMALLY SOLID FRACTION, SEPARATELY COLLECTING THE LATTERMENTIONED PHASES, AND RECOVERING A POLYMER FRACTION FROM EACH PHASE.
References Cited (Backward Citations)
US2658059A
Cited
US2692259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-28 | 1962-01-27 | 1962-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-28 | 1966-01-27 | 1966-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-28 | 1970-01-27 | 1970-07-29 | $7700.00 | Window Closed / Lapsed |