US3296238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process
Assignee: Shell USA Inc
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Filing: 1962-10-23
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Granted: 1967-01-03
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Expires: 1982-10-23
Abstract
No abstract record available.
Inventors
- 👤 Franciscus J F Van Der Plas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:36
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02; C08F6/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
189 words
IN A PROCESS FOR THE PRODUCTION OF SOLID POLYOLEFINS BY CONTACT OF A MONOOLEFIN OF FROM 2 TO 3 CARBON ATOMS PER MOLECULE WITH A CATALYST COMPRISING A HALIDE OF TITANIUM AND AN ALUMINUM ALKYL COMPOUND, IN WHICH POLYMER IS RECOVERED FROM THE REACTION ZONE IN FINELY DIVIDED FORM SUSPENDED IN ALKANE OF FROM 3 TO 8 CARBON ATOMS PER MOLECULE, THE IMPROVEMENT WHICH COMPRISES (A) ADDING TO SAID POLYMER SUSPENSION FROM 0.05% TO 1% BY WEIGHT OF HYDROGEN CHLORIDE AND FROM 0.5 TO 4% BY VOLUME OF AN ALKANOL OF FROM 4 TO 5 CARBON ATOMS PER MOLECULE, (B) AGITATING THE RESULTING MIXTURE AT A TREATING TEMPERATURE OF FROM 15* TO 150*C., (C) PROVIDING THOROUGH CONTACT OF THE TREATED MIXTURE WITH FROM 1 TO 5 PERCENT BY VOLUME OF ADDED WATER, AT A TEMPERATURE OF FROM 15* TO 150*C., (D) SETTLING THE MIXTURE, (E) SEPARATING AND REMOVING THE AQUEOUS LAYER, (F) SEPARATING SOLID POLYMER FROM THE NON-AQUEOUS LAYER, (G) RECOVERING AN AZEOTROPE OF ALKANE AND ALCOHOL, FREE OF CONTAMINANTS, FROM THE REMAINING NON-AQUEOUS LIQUID BY DISTILLATION, AND (H) RECYCLING SAID AZEOTROPE TO SAID POLYMER SUSPENSION IN STEP (A).
Claim 2
Dependent Claim
189 words
IN A PROCESS FOR THE PRODUCTION OF SOLID POLYOLEFINS BY CONTACT OF A MONOOLEFIN OF FROM 2 TO 3 CARBON ATOMS PER MOLECULE WITH A CATALYST COMPRISING A HALIDE OF TITANIUM AND AN ALUMINUM ALKYL COMPOUND, IN WHICH POLYMER IS RECOVERED FROM THE REACTION ZONE IN FINELY DIVIDED FORM SUSPENDED IN ALKANE OF FROM 3 TO 8 CARBON ATOMS PER MOLECULE, THE IMPROVEMENT WHICH COMPRISES (A) ADDING TO SAID POLYMER SUSPENSION FROM 0.05% TO 1% BY WEIGHT OF HYDROGEN CHLORIDE AND FROM 0.5 TO 4% BY VOLUME OF AN ALKANOL OF FROM 4 TO 5 CARBON ATOMS PER MOLECULE, (B) AGITATING THE RESULTING MIXTURE AT A TREATING TEMPERATURE OF FROM 15* TO 150*C., (C) PROVIDING THOROUGH CONTACT OF THE TREATED MIXTURE WITH FROM 1 TO 5 PERCENT BY VOLUME OF ADDED WATER, AT A TEMPERATURE OF FROM 15* TO 150*C., (D) SETTLING THE MIXTURE, (E) SEPARATING AND REMOVING THE AQUEOUS LAYER, (F) SEPARATING SOLID POLYMER FROM THE NON-AQUEOUS LAYER, (G) RECOVERING AN AZEOTROPE OF ALKANE AND ALCOHOL, FREE OF CONTAMINANTS, FROM THE REMAINING NON-AQUEOUS LIQUID BY DISTILLATION, AND (H) RECYCLING SAID AZEOTROPE TO SAID POLYMER SUSPENSION IN STEP (A).
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |