US3105828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerizing diolefins with alkyl lithium catalyst in tetrahydrofuran solvent
Assignee: Shell USA Inc
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Filing: 1957-12-30
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Granted: 1963-10-01
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Expires: 1977-12-30
Abstract
No abstract record available.
Inventors
- 👤 Lee M Porter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:25
CPC Classifications
H; H01; H01M; H01M6/00; H01M6/04; H01M6/06; C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A PROCESS FOR PREPARING UNSATURATED POLYMERS SUITABLE FOR USE IN COATING COMPOSITION WHICH COMPRISES CONTACTING AN UNSATURATED MONOMER OF THE GROUP CONSISTING OF BUTADIENE, ISOPRENE, MIXTURES OF BUTADIENE AND ISOPRENE, MIXTURES OF BUTADIENE AND UP TO 30% BY WEIGHT OF STYRENE, MIXTURES OF BUTADIENE AND UP TO 30% BY WEIGHT OF ALPHA-METHYLSTYRENE, MIXTURES OF ISOPRENE AND UP TO 30% BY WEIGHT OF STYRENE, MIXTURES OF ISOPRENE AND UP TO 30% BY WEIGHT OF ALPHA-METHYLSTYRENE WITH FROM 0.001 TO 0.1 MOL PER MOL OF UNSATURATED MONOMER OF AN ALKYL LITHIUM CONTAINING NO MORE THAN 8 CARBON ATOMS IN THE PRESENCE OF AT LEAST 0.4 MOL OF TETRAHYDROFURAN SOLVENT PER MOL OF UNSATURATED MONOMER IN AN INERT ATMOSPHERE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AT A TEMPERATURE IN THE RANGE FROM -40*C. TO 100*C., ADDING SUFFICIENT UNSATURATED MONOMER DURING SAID CONTACTING STEP TO PRODUCE A POLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE FROM 2,000 TO 500,000 AS DETERMINED BY THE LIGHT SCATTERING METHOD, WHEREBY A POLYMER IS PRODUCED WHICH CONTAINS NO MORE THAN ABOUT 10% OF 1,4STRUCTURE.
Claim 2
Dependent Claim
174 words
A PROCESS FOR PREPARING UNSATURATED POLYMERS SUITABLE FOR USE IN COATING COMPOSITION WHICH COMPRISES CONTACTING AN UNSATURATED MONOMER OF THE GROUP CONSISTING OF BUTADIENE, ISOPRENE, MIXTURES OF BUTADIENE AND ISOPRENE, MIXTURES OF BUTADIENE AND UP TO 30% BY WEIGHT OF STYRENE, MIXTURES OF BUTADIENE AND UP TO 30% BY WEIGHT OF ALPHA-METHYLSTYRENE, MIXTURES OF ISOPRENE AND UP TO 30% BY WEIGHT OF STYRENE, MIXTURES OF ISOPRENE AND UP TO 30% BY WEIGHT OF ALPHA-METHYLSTYRENE WITH FROM 0.001 TO 0.1 MOL PER MOL OF UNSATURATED MONOMER OF AN ALKYL LITHIUM CONTAINING NO MORE THAN 8 CARBON ATOMS IN THE PRESENCE OF AT LEAST 0.4 MOL OF TETRAHYDROFURAN SOLVENT PER MOL OF UNSATURATED MONOMER IN AN INERT ATMOSPHERE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS AT A TEMPERATURE IN THE RANGE FROM -40*C. TO 100*C., ADDING SUFFICIENT UNSATURATED MONOMER DURING SAID CONTACTING STEP TO PRODUCE A POLYMER HAVING A MOLECULAR WEIGHT IN THE RANGE FROM 2,000 TO 500,000 AS DETERMINED BY THE LIGHT SCATTERING METHOD, WHEREBY A POLYMER IS PRODUCED WHICH CONTAINS NO MORE THAN ABOUT 10% OF 1,4STRUCTURE.
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) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |