US3817954A
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Process for producing conjugated diene polymers
Assignee: JSR Corp
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Filing: 1973-04-18
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Granted: 1974-06-18
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Expires: 1993-04-18
Abstract
Abstract A conjugated diene polymer having a high cis-1,4 configuration content and having a high molecular weight can advantageously be produced by homopolymerizing or copolymerizing at least one conjugated diene or copolymerizing at least one conjugated diene with at least one vinyl aromatic hydrocarbon with a catalyst consisting essentially of at least one organolithium compound and at least one aliphatic nitrile in a proportion of 0.01 to 1.0 mole of the aliphatic nitrile per carbon-linked lithium atom and optionally carbon disulfide as promoter. The vulcanizate of said polymer of isoprene is very similar in physical properties to that of a natural Hevea rubber.
Inventors
- 👤 M Kawakami
- 👤 Y Yoshida
- 👤 C Nozaki
- 👤 H Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:37
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
30 words
A process according to claim 1, wherein the amount of the catalyst is 0.01 to 100 milligram equivalent in terms oF carbon-linked lithium per mole of the monomer or monomers.
Claim 2
Dependent Claim
31 words
A process according to claim 1, wherein the polymerization is effected under a pressure of from atmospheric pressure to 10 atmospheres at a temperature of from -50* C to +100* C.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the polymerization is effected under an inert atmosphere.
Claim 4
Dependent Claim
26 words
A process according to claim 1, wherein the conjugated diene monomer is selected from the group consisting of 1,3-butadiene, isoprene, 2-ethyl-1,3-butadiene, 1,3-pentadiene, 2-n-propyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene and 2-n-butyl-1,3-butadiene.
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein the conjugated diene is 2-alkyl-substituted-1,3-conjugated diene.
Claim 6
Dependent Claim
12 words
A process according to claim 1, wherein the conjugated diene is isoprene.
Claim 7
Dependent Claim
25 words
A process according to claim 1, wherein the vinyl aromatic hydrocarbon is selected from the group consisting of styrene, Alpha -methylstyrene, 3-vinyltoluene, divinylbenzene and 1-vinylnaphthalene.
Claim 8
Dependent Claim
37 words
A process according to claim 1, wherein the reaction is effected in the presence of a hydrocarbon solvent selected from the group consisting of paraffinic hydrocarbons, naphthenic hydrocarbons, monoolefinic hydrocarbons, aromatic hydrocarbons and mixtures of these hydrocarbons.
Claim 9
Dependent Claim
25 words
A process according to claim 9, wherein the hydrocarbon solvent is butane, pentane, hexane, heptane, octane, cyclopentane, butene, pentene, hexene, heptene, benzene, toluene or xylene.
Claim 10
Dependent Claim
21 words
A process according to claim 1, wherein the organolithium compound is a monolithium compound, a polylithium compound or a mixture thereof.
Claim 11
Dependent Claim
28 words
A process according to claim 1, wherein the organolithium compound is methyllithium, ethyllithium, propyllithium, butyllithium, amyllithium, hexyllithium, phenyllithium, naphthyllithium, methylenedilithium, ethylenedilithium, trimethylenedilithium, tetramethylenedilithium, 1,4-dilithiumbenzene, diisopropenyldilithium, dibutadienyldilithium or distyrenyldilithium.
Claim 12
Dependent Claim
12 words
A process according to claim 1, wherein the organolithium compound is n-butyllithium.
Claim 13
Dependent Claim
24 words
A process according to claim 1, wherein the aliphatic nitrile is selected from the group consisting of acetonitrile, propionitrile, butyronitrile, valeronitrile, capronitrile and enanthonitrile.
Claim 14
Dependent Claim
12 words
A process according to claim 1, wherein the aliphatic nitrile is acetonitrile.
Claim 15
Dependent Claim
24 words
A process according to claim 1, wherein the organolithium compound and the aliphatic nitrile are first mixed together and then added to the monomers.
Claim 16
Dependent Claim
20 words
A process according to claim 1, wherein the organolithium compound and the aliphatic nitrile are separately added to the monomers.
Claim 17
Dependent Claim
122 words
A process for producing a conjugated diene polymer by homopolymerizing or copolymerizing at least one conjugated diene or copolymerizing at least one conjugated diene and at least one vinyl aromatic hydrocarbon with a lithium-based catalyst, characterized in that the monomer or monomers are contacted with a catalyst consisting essentially of at least one organolithium compound, at least one aliphatic nitrile having the formula, RCN, wherein R is alkyl of one to six carbon atoms, and carbon disulfide, in a proportion of 0.01 to 1.0 mole of the aliphatic nitrile per carbon-linked lithium atom and in such a proportion that the total of the aliphatic nitrile and the carbon disulfide is up to 1 mole per carbon-linked lithium atom of the organolithium compound.
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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |