US3402159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing butadiene and styrene terminated in short blocks of polystyrene
Assignee: Phillips Petroleum Co
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Filing: 1963-12-20
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Granted: 1968-09-17
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Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Henry L Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:23
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08F236/00; C08F236/02; C08F236/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A PROCESS WHICH COMPRISES: INTRODUCING INTO A POLYMERIZATION ZONE 1,3-BUTADIENE AND STYRENE, THE QUANTITY OF SAID 1,3-BUTADIENE BEING AT LEAST 60 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT TOTAL MONOMERS, SAID POLYMERIZATION ZONE CONTAINING TETRAHYDROFURAN, CYCLOHEXAND, AND N-BUTYLLITHIUM INITIATOR; CONDUCTING THE OPOLYMERIZATION IN AN INERT ATMOSPHERE UNDER CONDITIONS TO GIVE A POLYMER OF SUBSTANTIALLY THE FINAL VISCOSITY DESIRED UNTIL SUBSTANTIALLY COMPLETE CONVERSION OF THE MONOMERS IS OBTAINED; THEREAFTER INTRODUCING INTO SIAD POLYMERIZATION ZONE A SECOND QUANTITY OF STYRENE IN AN AMOUNT WITHIN THE RANGE OF 0.5 TO 4 WEIGHT PERCENT BASED ON THE WEIGHT OF THE TOTAL POLYMER; AND RECOVERING FROM SAID POLYMERIZATION ZONE A COPOLYMER WHEREIN RANDOM COPOLYMER CHAINS ARE TERMINATED IN SHORT BLOCKS OF POLYSTYRENE.
Claim 2
Dependent Claim
118 words
A PROCESS WHICH COMPRISES: INTRODUCING INTO A POLYMERIZATION ZONE 1,3-BUTADIENE AND STYRENE, THE QUANTITY OF SAID 1,3-BUTADIENE BEING AT LEAST 60 PARTS BY WEIGHT PER 100 PARTS BY WEIGHT TOTAL MONOMERS, SAID POLYMERIZATION ZONE CONTAINING TETRAHYDROFURAN, CYCLOHEXAND, AND N-BUTYLLITHIUM INITIATOR; CONDUCTING THE OPOLYMERIZATION IN AN INERT ATMOSPHERE UNDER CONDITIONS TO GIVE A POLYMER OF SUBSTANTIALLY THE FINAL VISCOSITY DESIRED UNTIL SUBSTANTIALLY COMPLETE CONVERSION OF THE MONOMERS IS OBTAINED; THEREAFTER INTRODUCING INTO SIAD POLYMERIZATION ZONE A SECOND QUANTITY OF STYRENE IN AN AMOUNT WITHIN THE RANGE OF 0.5 TO 4 WEIGHT PERCENT BASED ON THE WEIGHT OF THE TOTAL POLYMER; AND RECOVERING FROM SAID POLYMERIZATION ZONE A COPOLYMER WHEREIN RANDOM COPOLYMER CHAINS ARE TERMINATED IN SHORT BLOCKS OF POLYSTYRENE.
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) | 1971-09-17 | 1972-03-18 | 1972-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-17 | 1976-03-18 | 1976-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-17 | 1980-03-18 | 1980-09-17 | $7700.00 | Window Closed / Lapsed |