Patent US2636025A successfully refreshed from Google Patents.
US2636025A
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Method for starting low-tem-perature isoolefin polymerization after solvent-cleaningthe reactor
Assignee: Standard Oil Development Co
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Filing: 1949-10-11
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Granted: 1953-04-21
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Expires: 1969-10-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Howe
- 👤 Frederic A L Holloway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:30
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/04; C08F210/08; C08F210/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN A CONTINUOUS LOW TEMPERATURE POLYMERIZATION PROCESS FOR THE COPOLYMERIZATION OF ISOBUTYLENE AND A MULTIOLEFIN HAVING FROM 4 TO 14, INCLUSIVE, CARBON ATOMS PER MOLECULE IN THE PRESENCE OF A CATALYST SOLUTION CONSISTING OF A FRIEDEL-CRAFTS CATALYST DISSOLVED IN A LOW-FREEZING, NON-COMPLEX-FORMING SOLVENT, THE STEPS IN COMBINATION OF SOLVENT-CLEANING THE REACTOR, COOLING THE REACTOR TO A TEMPERATURE WITHIN THE RANGE BETWEEN -87* C., AND -103* C., SIMULTANEOUSLY DELIVERING THERETO A FILLING OF REACTIVE MATERIAL CONTAINING APPROXIMATELY ONE-FIFTH THE NORMAL PERCENTAGE OF ISOBUTYLENE; APPROXIMATELY TWO-FIFTHS THE NORMAL AMOUNT OF DIOLEFIN; ABOUT TWICE THE AMOUNT OF BUTENE-1, AND AN INCREASED AMOUNT OF DILUENT, WHEREBY THE CONCENTRATION OF OLEFIN REACTANTS IS LESS THAN ONE-HALF THE CONCENTRATION OF OLEFIN REACTANTS IN THE NORMAL RE-
Claim 2
Dependent Claim
120 words
IN A CONTINUOUS LOW TEMPERATURE POLYMERIZATION PROCESS FOR THE COPOLYMERIZATION OF ISOBUTYLENE AND A MULTIOLEFIN HAVING FROM 4 TO 14, INCLUSIVE, CARBON ATOMS PER MOLECULE IN THE PRESENCE OF A CATALYST SOLUTION CONSISTING OF A FRIEDEL-CRAFTS CATALYST DISSOLVED IN A LOW-FREEZING, NON-COMPLEX-FORMING SOLVENT, THE STEPS IN COMBINATION OF SOLVENT-CLEANING THE REACTOR, COOLING THE REACTOR TO A TEMPERATURE WITHIN THE RANGE BETWEEN -87* C., AND -103* C., SIMULTANEOUSLY DELIVERING THERETO A FILLING OF REACTIVE MATERIAL CONTAINING APPROXIMATELY ONE-FIFTH THE NORMAL PERCENTAGE OF ISOBUTYLENE; APPROXIMATELY TWO-FIFTHS THE NORMAL AMOUNT OF DIOLEFIN; ABOUT TWICE THE AMOUNT OF BUTENE-1, AND AN INCREASED AMOUNT OF DILUENT, WHEREBY THE CONCENTRATION OF OLEFIN REACTANTS IS LESS THAN ONE-HALF THE CONCENTRATION OF OLEFIN REACTANTS IN THE NORMAL RE-
References Cited (Backward Citations)
US2444848A
Cited
US2580490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-04-20 | 1956-10-20 | 1957-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-20 | 1960-10-20 | 1961-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-20 | 1964-10-20 | 1965-04-21 | $7700.00 | Window Closed / Lapsed |