US3208988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of isoprene using a hydrocarbon polylithium catalyst
Assignee: Bridgestone Firestone Inc
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Filing: 1961-10-24
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Granted: 1965-09-28
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Expires: 1981-10-24
Abstract
No abstract record available.
Inventors
- 👤 Lawrence E Forman
- 👤 Richard W Kibler
- 👤 Francis A Bozzacco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:14
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
3-TRILITHIUM PENTANE, 1,3,5-TRILITHIUM BENZENE AND MMIXTURES THEREOF WITH OTHER LITHIUM-DEPENDENT CATALYSTS, THE AMOUNT OF SAID HYDROCARBON POLYLITHIUM COMPOUND BEING SUFFICIENT TO PROVIDE NOT MORE THAN 0.1 GRAM OF CARBONLINKED LITHIUM, EXPRESSED AT LITHIUM METAL, FOR EACH 100 GRAMS OF ISOPRENE, AND THE ISOPRENE BEING SUBSTANTIALLY FREE FROM ETHERS, ESTERS, ALDEHYDES, KETONES AND PRIMARY AND SECONDARY AMINES.
Claim 2
Dependent Claim
56 words
3-TRILITHIUM PENTANE, 1,3,5-TRILITHIUM BENZENE AND MMIXTURES THEREOF WITH OTHER LITHIUM-DEPENDENT CATALYSTS, THE AMOUNT OF SAID HYDROCARBON POLYLITHIUM COMPOUND BEING SUFFICIENT TO PROVIDE NOT MORE THAN 0.1 GRAM OF CARBONLINKED LITHIUM, EXPRESSED AT LITHIUM METAL, FOR EACH 100 GRAMS OF ISOPRENE, AND THE ISOPRENE BEING SUBSTANTIALLY FREE FROM ETHERS, ESTERS, ALDEHYDES, KETONES AND PRIMARY AND SECONDARY AMINES.
Claim 3
Dependent Claim
73 words
PROCESS OF POLYMERIZING ISOPRENE TO FORM ESSENTIALLY CIS-POLYMERS SHOWING BY INFRARED TECHNIQUE AT LEAST ABOUT 75% CIS-1,4-STRUCTURE, A MAXIMUM OF ABOUT 7 TO 10% TRANS-1,4-STRUCTURE, A MAXIMUM OF ABOUT 10% 3,4STRUCTURE, AND SUBSTANTIALLY NO 1,2-SSTRUCTURE WHICH COMPRISES CONTACTING, AT TEMPERATURES IN THE RANGE OF -100* C. TO 150*C., THE ISOPRENE WITH A HYDROCARBON POLYLITHIUM, HEXAMETHYLENE DILITHIUM, DECAMETHYLENE DILITHIUM, OCTAMETHYLENE DILITHIUM, 1,2-DILITHIUM PROPANE, 1,4-DILITHIUM BENZENE, 1,5-DILITHIUM NAPHTHALENE, 1,2-DILITHIUM1.3-TRIPHENYL PROPANE, THE COMPOUND OF THE FORMULA
Claim 4
Dependent Claim
73 words
PROCESS OF POLYMERIZING ISOPRENE TO FORM ESSENTIALLY CIS-POLYMERS SHOWING BY INFRARED TECHNIQUE AT LEAST ABOUT 75% CIS-1,4-STRUCTURE, A MAXIMUM OF ABOUT 7 TO 10% TRANS-1,4-STRUCTURE, A MAXIMUM OF ABOUT 10% 3,4STRUCTURE, AND SUBSTANTIALLY NO 1,2-SSTRUCTURE WHICH COMPRISES CONTACTING, AT TEMPERATURES IN THE RANGE OF -100* C. TO 150*C., THE ISOPRENE WITH A HYDROCARBON POLYLITHIUM, HEXAMETHYLENE DILITHIUM, DECAMETHYLENE DILITHIUM, OCTAMETHYLENE DILITHIUM, 1,2-DILITHIUM PROPANE, 1,4-DILITHIUM BENZENE, 1,5-DILITHIUM NAPHTHALENE, 1,2-DILITHIUM1.3-TRIPHENYL PROPANE, THE COMPOUND OF THE FORMULA
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |