US3560593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of block copolymers
Assignee: Phillips Petroleum Co
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Filing: 1968-01-02
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Granted: 1971-02-02
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Expires: 1988-01-02
Abstract
Abstract RUBBERY BLOCK COPOLYMERS OF CONJUGATED DIENES AND MONOVINYL-SUBSTITUTED AROMATIC COMPOUNDS ARE MADE IN THE PRESENCE OF A CYCLOPENTYLLITHIUM INITIATOR BY FIRST CHARGING ONE OF THE MONOMERS AND ALLOWING IT TO POLYMERIZE TO SUBSTANTIALLY COMPLETE CONVERSION OF MONOMER INTO POLYMER, ADDING A DISSIMILAR MONOMER TO THE FIRST FORMED REACTION MIXTURE AND ALLOWING IT TO POLYMNERIZE TO SUBSTANTIALLY COMPLETE CONVERSION AND FINALLY ADDING THE REMAINING MONOMER WHICH IS DISSIMILAR TO THE SECOND MONOMER. BLOCK COPOLYMERS PREPARED BY THIS METHOD HAVE HIGH GREEN TENSILE STRENGTH.
Inventors
- 👤 Henry L Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:03
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |