US3595941A
Expired / Lapsed
US
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Method for controlling the mooney viscosity of alkali metal-terminated polymers
Assignee: Phillips Petroleum Co
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Filing: 1966-11-04
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Granted: 1971-07-27
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Expires: 1986-11-04
Abstract
Abstract IN THE FORMATION OF RANDOM OR BLOCK COPOLYMERS OF A CONJUGATED DIENE AND STYRENE, A YELLOW COLOR FORMS ONLY WHEN POLYMERIZATION OF TH CONJUGATED DIENE IS SUBSTANTIALLY COMPLETE. THE COLOR FORMATION IS UTILIZED TO DETERMINE THE OPTIMUM TIME FOR ADDITION OF TREATING AGENTS TO PROVIDE COUPLING AND/OR BRANCHING, SO AS TO SUBSTANTIALLY INCREASE THE MOONEY VALUE OF THE FINAL POLYMER.
Inventors
- 👤 Ralph C Farrar
- 👤 Alvin C Rothlisberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:48
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |