US3390141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymerization process
Assignee: Shell USA Inc
•
Filing: 1964-10-09
•
Granted: 1968-06-25
•
Expires: 1984-10-09
Abstract
No abstract record available.
Inventors
- 👤 Harry F Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:49
CPC Classifications
C; C08; C08F; C08F210/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
IN A PROCESS FOR THE PORDUCTION OF A MODIFIED CRYSTALLIZABLE POLYALKENE OF THE GROUP CONSISTING OF POLYETHYLENE AND RANDOM COPOLYMERS OF ETHYLENE WITH FROM 5 TO 60 MOL PERCENT OF AN ALPHA-MONOOLEFIN OF FROM 3 TO 18 CARBON ATOMS PER MOLECULE BY CONTACT OF THE POLYMERIZATION FEED COMPONENTS IN LIQUID PHASE WITH A CATALYST FROM THE GROUP CONSISTING OF HALIDES OF TITANIUM AND VANADIUM, AND HYDROCARBON-SOLUBLE COMPOUNDS OF VANADIUM, AND, AS COCATALYST, AN ORGANOALUMINUM COMPOUND, THE IMPROVEMENT WHICH COMPRISES CONTINUALLY ADDING SAID FEED COMPONENTS TO A LIQUID REACTION MIXTURE CONTAINING SAID CATALYST WHILE SIMULATENEOUSLY CONTINUALLY ADDING TO SAID REACTION MIXTURE AN AMOUNT OF STYRENE SUFFICIENT TO RESULT IN A POLYMERIZATION PRODUCT CONTAINING FROM 0.01 TO 7 WEIGHT PERCENT STYRENE CHARACTERIZED BY A LOWER MOLECULAR WEIGHT THAN POLYALKENE PRODUCED UNDER IDENTICAL CONDITIONS EXCEPT FOR OMISSION OF STYRENE FROM THE POLYMERIZATION MIXTURE.
Claim 2
Dependent Claim
140 words
IN A PROCESS FOR THE PORDUCTION OF A MODIFIED CRYSTALLIZABLE POLYALKENE OF THE GROUP CONSISTING OF POLYETHYLENE AND RANDOM COPOLYMERS OF ETHYLENE WITH FROM 5 TO 60 MOL PERCENT OF AN ALPHA-MONOOLEFIN OF FROM 3 TO 18 CARBON ATOMS PER MOLECULE BY CONTACT OF THE POLYMERIZATION FEED COMPONENTS IN LIQUID PHASE WITH A CATALYST FROM THE GROUP CONSISTING OF HALIDES OF TITANIUM AND VANADIUM, AND HYDROCARBON-SOLUBLE COMPOUNDS OF VANADIUM, AND, AS COCATALYST, AN ORGANOALUMINUM COMPOUND, THE IMPROVEMENT WHICH COMPRISES CONTINUALLY ADDING SAID FEED COMPONENTS TO A LIQUID REACTION MIXTURE CONTAINING SAID CATALYST WHILE SIMULATENEOUSLY CONTINUALLY ADDING TO SAID REACTION MIXTURE AN AMOUNT OF STYRENE SUFFICIENT TO RESULT IN A POLYMERIZATION PRODUCT CONTAINING FROM 0.01 TO 7 WEIGHT PERCENT STYRENE CHARACTERIZED BY A LOWER MOLECULAR WEIGHT THAN POLYALKENE PRODUCED UNDER IDENTICAL CONDITIONS EXCEPT FOR OMISSION OF STYRENE FROM THE POLYMERIZATION MIXTURE.
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |