US3789090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of conjugated diene liquid polymers
Assignee: Eneos Corp
•
Filing: 1970-06-04
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Granted: 1974-01-29
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Expires: 1990-06-04
Abstract
Abstract A process is disclosed for the production of liquid polymers by polymerizing conjugated diolefins or copolymerizing these diolefins with vinyl compounds in the presence of particularly organosodium catalysts, where the resulting polymers are controlled in the desired average molecular weight and have very low color.
Inventors
- 👤 Y Otsuki
- 👤 H Hara
- 👤 N Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:31
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
The process as defined in claim 1 wherein said conjugated diolefin is selected from the group consisting of butadiene, 2,3-dimethyl-1,3-butadiene, isoprene and piperylene.
Claim 2
Dependent Claim
13 words
The process as defined in claim 1 wherein said organosodium initiator is benzylsodium.
Claim 3
Dependent Claim
25 words
The process as defined in claim 1 wherein said transfer agent is selected from the group consisting of toluene, xylenes, ethylbenzene, cumene, mesitylene and durene.
Claim 4
Dependent Claim
20 words
The process as defined in claim 1 which further comprises copolymerizing said conjugated diolefin with an anion-polymerization active vinyl monomer.
Claim 5
Dependent Claim
13 words
The process as defined in claim 5 wherein said vinyl monomer is styrene.
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US2751426A
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US3091653A
Cited
GB876587A
Cited
US3110706A
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US3084084A
Cited
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Cited
US3360580A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |