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US4260707A
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Solution polymerization of conjugated dienes
Assignee: Bayer AG
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Filing: 1980-02-01
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Granted: 1981-04-07
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Expires: 2000-02-01
Abstract
Abstract A catalyst comprising (a) a reaction mixture formed by reacting M(RCO 2 ) 3 with AlR 3 1 , (b) AlR 3 2 and/or HAlR 2 2 and (c) a Lewis acid wherein M denotes a trivalent rare earth element with an atomic number of 57 to 71, R denotes a saturated or unsaturated, straight chain or branched chain alkyl group having 1 to 20 C-atoms which may be substituted one or more times with cycloalkyl having 5 to 7-atoms and/or phenyl, the carboxyl group being attached to a primary, secondary or tertiary C-atom; a cycloalkyl group having 5 to 7 ring carbon atoms, which may be substituted one or more times with alkyl groups having from 1 to 5 C-atoms; or an aromatic group having from 6 to 10 ring carbon atoms, which may be substituted one or more times with alkyl groups having 1 to 5 C-atoms, and R 1 and R 2 are identical or different, straight chain or branched chain alkyl groups having from 1 to 10 C-atoms. Said catalyst may be used for polymerizing diene monomers in solution. Its production takes place by mixing the components in any order.
Inventors
- 👤 Gerd Sylvester
- 👤 Josef Witte
- 👤 Gunter Marwede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:29
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
248 words
A process for the polymerization of a conjugated diene which comprises polymerizing the conjugated diene in the presence of a catalytic amount of a catalyst comprising (A) a hydrocarbon soluble reaction mixture formed by reacting a rare earth carboxylate, M(RCO 2 ) 3 , with an aluminum trialkyl, AlR 1 3 , (B) an aluminum trialkyl, AlR 2 3 , and/or an alkylaluminumhydride and (C) a Lewis acid selected from the group consisting of an organometallic halide whose metal is of main group 3a or 4a of the Periodic System and a halide of an element of main group 3a, 4a or 5a of the Periodic System, wherein M denotes a trivalent rare earth element with an atomic number of 57 to 71, R denotes a saturated or unsaturated, straight chain or branched chain alkyl group having 1 to 20 C-atoms which may be substituted one or more times with cycloalkyl having 5 to 7 C-atoms and/or phenyl, the carboxyl group being attached to a primary, secondary or tertiary C-atom; a cycloalkyl group having 5 to 7 ring carbon rings, which may be substituted one or more times with alkyl groups having from 1 to 5 C-atoms; or an aromatic group having from 6 to 10 ring carbon atoms, which may be substituted one or more times with alkyl groups having 1 to 5 C-atoms, and R 1 and R 2 are identical or different, straight chain or branched chain alkyl groups having from 1 to 10 C-atoms.
Claim 2
Dependent Claim
248 words
A process for the polymerization of a conjugated diene which comprises polymerizing the conjugated diene in the presence of a catalytic amount of a catalyst comprising (A) a hydrocarbon soluble reaction mixture formed by reacting a rare earth carboxylate, M(RCO 2 ) 3 , with an aluminum trialkyl, AlR 1 3 , (B) an aluminum trialkyl, AlR 2 3 , and/or an alkylaluminumhydride and (C) a Lewis acid selected from the group consisting of an organometallic halide whose metal is of main group 3a or 4a of the Periodic System and a halide of an element of main group 3a, 4a or 5a of the Periodic System, wherein M denotes a trivalent rare earth element with an atomic number of 57 to 71, R denotes a saturated or unsaturated, straight chain or branched chain alkyl group having 1 to 20 C-atoms which may be substituted one or more times with cycloalkyl having 5 to 7 C-atoms and/or phenyl, the carboxyl group being attached to a primary, secondary or tertiary C-atom; a cycloalkyl group having 5 to 7 ring carbon rings, which may be substituted one or more times with alkyl groups having from 1 to 5 C-atoms; or an aromatic group having from 6 to 10 ring carbon atoms, which may be substituted one or more times with alkyl groups having 1 to 5 C-atoms, and R 1 and R 2 are identical or different, straight chain or branched chain alkyl groups having from 1 to 10 C-atoms.
Claim 3
Dependent Claim
15 words
The process according to claim 1 wherein M stands for lanthanum, cerium, praseodymium or neodymium.
Claim 4
Dependent Claim
22 words
The process according to claim 1 wherein M is a mixture of rare earth elements with atomic numbers from 57 to 71.
Claim 5
Dependent Claim
33 words
The process according to claim 1 wherein M is a mixture of rare earth elements containing at least 10% by weight of at least one of the elements, lanthanum, cerium, praseodymium or neodymium.
Claim 6
Dependent Claim
27 words
The process according to claim 1 wherein M is a mixture of elements of the rare earths containing at least 30% by weight of lanthanum or neodymium.
Claim 7
Dependent Claim
13 words
The process according to claim 1 wherein R 1 is ethyl or isobutyl.
Claim 8
Dependent Claim
13 words
The process according to claim 1 wherein R 2 is ethyl or isobutyl.
Claim 9
Dependent Claim
40 words
The process according to claim 1 wherein for the preparation of component A, the compounds M(RCO 2 ) 3 and AlR 1 3 are used in a hydrocarbon in a molar ratio within the range of from 1:0.5 to 1:50.
Claim 10
Dependent Claim
39 words
The process according to claim 1 wherein the molar ratio of M(RCO 2 ) 3 to the sum of AlR 1 3 , AlR 2 3 and HAlR 2 2 is in the range of from 1:2 to 1:100.
Claim 11
Dependent Claim
37 words
The process according to claim 1 wherein components A and C are used in a molar ratio of C:A, based on the quantity of M(RCO 2 ) 3 used, in the range of from 0.4:1 to 15:1.
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) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |