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Patent US3935177A successfully refreshed from Google Patents.
US3935177A
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Polymerisation and copolymerisation of dienes
Assignee: Bayer AG
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Filing: 1974-11-06
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Granted: 1976-01-27
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Expires: 1994-11-06
Abstract
Abstract Process for the homopolymerisation and copolymerisation of conjugated dienes in inert organic solvents on alkali metal amides as catalysts in the presence of a solvating agent for the amide.
Inventors
- 👤 Eberhard Muller
- 👤 Gunter Marwede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:48
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A process for the homo- or copolymerisation of conjugated dienes, which comprises contacting at least one conjugated diene in an inert organic solvent with a catalytic amount of a catalyst consisting of an alkali metal amide of the formula: ##EQU2## wherein R and R', which may be the same or different, are C 3 - C 20 alkyl, C 5 - C 7 cycloalkyl, or C 6 - C 10 aryl and Me is lithium, sodium or potassium, in the presence of a solvating agent for the catalyst selected from the group consisting of diethers, tertiary aliphatic diamines, triethylamine and tetrahydrofuran.
Claim 2
Dependent Claim
101 words
A process for the homo- or copolymerisation of conjugated dienes, which comprises contacting at least one conjugated diene in an inert organic solvent with a catalytic amount of a catalyst consisting of an alkali metal amide of the formula: ##EQU2## wherein R and R', which may be the same or different, are C 3 - C 20 alkyl, C 5 - C 7 cycloalkyl, or C 6 - C 10 aryl and Me is lithium, sodium or potassium, in the presence of a solvating agent for the catalyst selected from the group consisting of diethers, tertiary aliphatic diamines, triethylamine and tetrahydrofuran.
Claim 3
Dependent Claim
18 words
The process as claimed in claim 1 in which the diene contains from 4 to 8 carbon atoms.
Claim 4
Dependent Claim
13 words
The process as claimed in claim 2 in which the diene is butadiene.
Claim 5
Dependent Claim
18 words
The process as claimed in claim 1 in which the diene is copolymerised with an aromatic vinyl compound.
Claim 6
Dependent Claim
15 words
The process as claimed in claim 4 in which the aromatic vinyl compound is styrene.
Claim 7
Dependent Claim
32 words
The process as claimed in claim 1 in which the alkali metal amide is lithium dipropylamide, lithium dibutylamide, lithium dicyclohexylamide, lithium diphenylamide, N-lithium-N-methyl anilide, N-lithium-N-ethylanilide, sodium dipropylamide, potassium dibutylamide or N-sodium-N-methyl anilide.
Claim 8
Dependent Claim
17 words
The process as claimed in claim 1 in which the solvating agent is dimethoxy ethane or N,N,N',N'-tetramethyl-ethylenediamine
Claim 9
Dependent Claim
30 words
The process as claimed in claim 1, in which the solvating agent is present in an amount of from 0.01 to 3 % by weight based on the conjugated diene.
Claim 10
Dependent Claim
31 words
The process as claimed in claim 1 in which the alkali metal amide is present in an amount of from 0.01 to 1 % by weight, based on the conjugated diene.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |