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US4520177A
Expired / Lapsed
US
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Polymerization of conjugated dienes
Assignee: Enichem Elastomers Ltd
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Filing: 1984-05-22
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Granted: 1985-05-28
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Expires: 2004-05-22
Abstract
Abstract The invention relates to a method of polymerizing one or more conjugated diene monomers to a polymer having an exceptionally high cis content employing a three component catalyst comprising (a) a rare earth compound, (b) an organo magnesium compound and (c) a Lewis acid in which a particular order of component addition is used. Under optimum conditions it is possible to obtain nearly 100% conversion to polymers of 98% or more cis content at very low concentrations of rare earth compound with respect to monomer.
Inventors
- 👤 Derek K. Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:55
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
66 words
A process for the polymerisation of one or more conjugated diene monomers as the sole polymerizable monomers by means of a catalyst comprising (a) a salt of a rare earth element or a complex of a rare earth element; (b) an organo magnesium compound and (c) a Lewis acid wherein the catalyst is formed by mixing component (a) with component (c) before contact with component (b).
Claim 2
Dependent Claim
66 words
A process for the polymerisation of one or more conjugated diene monomers as the sole polymerizable monomers by means of a catalyst comprising (a) a salt of a rare earth element or a complex of a rare earth element; (b) an organo magnesium compound and (c) a Lewis acid wherein the catalyst is formed by mixing component (a) with component (c) before contact with component (b).
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein the mixing is carried out in the presence of monomer.
Claim 4
Dependent Claim
35 words
A process according to claim 1 carried out in hydrocarbon solvent wherein the monomer is dissolved in the solvent and the catalyst components added in the order component (c), component (a) and finally component (b).
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein component (a) comprises a compound of neodymium.
Claim 6
Dependent Claim
15 words
A process, according to claim 1 wherein the organomagnesium compound is a dihydrocarbyl magnesium compound.
Claim 7
Dependent Claim
24 words
A process according to claim 5 wherein the organomagnesium compound is a dialkylmagnesium compound where each alkyl group has 1 to 10 carbon atoms.
Claim 8
Dependent Claim
15 words
A process according to claim 1 wherein the Lewis acid is an aluminium alkyl halide.
Claim 9
Dependent Claim
16 words
A process according to claim 3 wherein all three components are soluble in the hydrocarbon solvent.
Claim 10
Dependent Claim
26 words
A process according to claim 1 wherein component (a) is used in a concentration of 0.05 to 1.00 millimoles per one hundred grams of diene monomer.
Claim 11
Dependent Claim
26 words
A process according to claim 9 wherein component (a) is used in a concentration of 0.05 to 0.26 millimoles per one hundred grams of diene monomer.
Claim 12
Dependent Claim
20 words
A process according to claim 1 wherein the molar ratio of component (a) to component (b) is 0.01:1 to 0.5:1.
Claim 13
Dependent Claim
20 words
A process according to claim 11 wherein the molar ratio of component (a) to component (b) is 0.06:1 to 0.3:1.
Claim 14
Dependent Claim
26 words
A process according to claim 7 wherein the atomic ratio of halide in component (c) to rare earth metal in component (a) is 12:1 to 17:1.
Claim 15
Dependent Claim
41 words
A process according to claim 1 wherein the catalyst is prepared by adding an aluminium alkyl halide to conjugated diene monomer (s) dissolved in hydrocarbon solvent, then adding a hydrocarbon soluble compound of neodymium and finally a hydrocarbon soluble magnesium dialkyl.
Claim 16
Dependent Claim
28 words
A process according to claim 14 wherein the neodymium compound is used in a concentration of 0.05 to 1.00 millimoles per one hundred grams of diene monomer used.
Claim 17
Dependent Claim
27 words
A process according to claim 15 wherein component (a) is used in a concentration of 0.05 to 0.26 millimoles per one hundred grams of diene monomer used.
Claim 18
Dependent Claim
20 words
A process according to claim 14 wherein the molar ratio of component (a) to component (b) is 0.01:1 to 0.5:1.
Claim 19
Dependent Claim
20 words
A process according to claim 17 wherein the molar ratio of component (e) to component (a) is 0.06:1 to 0.3:1.
Claim 20
Dependent Claim
26 words
A process according to claim 14 wherein the atomic ratio of halide in component (c) to rare earth metal in component (a) is 12:1 to 17:1.
Claim 21
Dependent Claim
23 words
A process according to claim 14 wherein the conjugated diene is butadiene, isoprene, 1,3 pentadiene or a mixture of two or more thereof.
Claim 22
Dependent Claim
23 words
A process according to claim 1 wherein the catalyst consists of (a), (b), and (c) and (c) consists of an aluminium alkyl halide.
References Cited (Backward Citations)
US3708551A
Cited
US4384982A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-27 | 1988-11-26 | 1989-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-27 | 1992-11-26 | 1993-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-27 | 1996-11-26 | 1997-05-28 | $7700.00 | Window Closed / Lapsed |