US3347839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of conjugated diolefins
Assignee: Polysar Ltd
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Filing: 1964-01-02
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Granted: 1967-10-17
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Expires: 1984-01-02
Abstract
No abstract record available.
Inventors
- 👤 Lasis Evalds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:55
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS OF PRODUCING A TRANS-1,4 POLYMER OF ISOPRENE HAVING MORE THAN ABOUT 20 PERCENT OF X-RAY CRYSTALLINITY AND A TRANS-1,4 CONTENT OF AT LEAST 90 PERCENT, WHICH COMPRISES POLYMERIZING AT A TEMPERATURE OF FROM 0*C. TO 100*C. ISOPRENE WHILST DISPERSED IN AN INERT ORGANIC LIQUID, IN THE PRESENCE OF A CATALYST COMPRISING (A) VANADIUM TETRACHLORIDE, (B) A TITANIUM TETRAHALIDE SELECTED FROM TITANIUM TETRACHLORIDE AND TITANIUM TRICHLORO-MONOIODIDE, AND (C) AN ALKYL LITHIUM HAVING ONE TO TWELVE CARBON ATOMS IN THE ALKYL GROUP, THE ALKYL LITHIUM AND VANADIUM TETRACHLORIDE BEING ADMIXED IN THE PRESENCE OF ISOPRENE IN A MOLAR RATIO OF FROM 1:1 TO 5:1, AND THE MOLAR RATIO OF THE TITANIUM TETRAHALIDE TO VANADIUM TETRACHLORIDE BEING FROM 0.01:1 TO 1:1.
Claim 2
Dependent Claim
120 words
A PROCESS OF PRODUCING A TRANS-1,4 POLYMER OF ISOPRENE HAVING MORE THAN ABOUT 20 PERCENT OF X-RAY CRYSTALLINITY AND A TRANS-1,4 CONTENT OF AT LEAST 90 PERCENT, WHICH COMPRISES POLYMERIZING AT A TEMPERATURE OF FROM 0*C. TO 100*C. ISOPRENE WHILST DISPERSED IN AN INERT ORGANIC LIQUID, IN THE PRESENCE OF A CATALYST COMPRISING (A) VANADIUM TETRACHLORIDE, (B) A TITANIUM TETRAHALIDE SELECTED FROM TITANIUM TETRACHLORIDE AND TITANIUM TRICHLORO-MONOIODIDE, AND (C) AN ALKYL LITHIUM HAVING ONE TO TWELVE CARBON ATOMS IN THE ALKYL GROUP, THE ALKYL LITHIUM AND VANADIUM TETRACHLORIDE BEING ADMIXED IN THE PRESENCE OF ISOPRENE IN A MOLAR RATIO OF FROM 1:1 TO 5:1, AND THE MOLAR RATIO OF THE TITANIUM TETRAHALIDE TO VANADIUM TETRACHLORIDE BEING FROM 0.01:1 TO 1:1.
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |