US4022959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organolithium-Lewis base polymerization of 1,3-butadiene and novel polybutadienes thus produced
Assignee: Huels AG
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Filing: 1975-06-04
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Granted: 1977-05-10
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Expires: 1995-06-04
Abstract
Abstract Homopolymers of butadiene having a vinyl content which varies substantially and decreasingly along the longitudinal axis of the macromolecule toward an end thereof are produced by conducting an organolithium-Lewis base catalyzed polymerization at a substantially constantly increasing polymerization temperature throughout the polymerization.
Inventors
- 👤 Neithart Sommer
- 👤 Karl-Heinz Nordsiek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:51
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A process for the production of solid polybutadienes having long-chain branching and containing vinyl groups varying substantially along the longitudinal axis of the macromolecule which comprises polymerizing 1,3-butadiene in the presence of an alkyllithium-Lewis base catalyst system having a weight ratio of Lewis base to alkyllithium compound of 0.1 : 1 to 1,000 : 1 and the Lewis base is a monofunctional ether, a difunctional ether or a tertiary amine, in an inert diluent at a starting temperature of at least 60° C and with in increasing polymerization temperature substantially throughout the polymerization such that the temperature gradient through which the polymerizaton progresses is at least 50° C, and the reaction is conducted to a final temperature up to 155° C.
Claim 2
Dependent Claim
121 words
A process for the production of solid polybutadienes having long-chain branching and containing vinyl groups varying substantially along the longitudinal axis of the macromolecule which comprises polymerizing 1,3-butadiene in the presence of an alkyllithium-Lewis base catalyst system having a weight ratio of Lewis base to alkyllithium compound of 0.1 : 1 to 1,000 : 1 and the Lewis base is a monofunctional ether, a difunctional ether or a tertiary amine, in an inert diluent at a starting temperature of at least 60° C and with in increasing polymerization temperature substantially throughout the polymerization such that the temperature gradient through which the polymerizaton progresses is at least 50° C, and the reaction is conducted to a final temperature up to 155° C.
Claim 3
Dependent Claim
8 words
A polybutadiene produced in accordance with claim 1.
Claim 4
Dependent Claim
18 words
A process according to claim 1 wherein the catalyst is added only at the beginning of the polymerization.
References Cited (Backward Citations)
US3301840A
Cited
US3502746A
Cited
US3451988A
Cited
US3887535A
Cited
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Cited
US3829409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |