US4619982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of conjugated dienes
Assignee: Enoxy Chemical Ltd
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Filing: 1983-03-31
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Granted: 1986-10-28
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Expires: 2003-03-31
Abstract
Abstract The invention relates to a catalyst system comprising (a) a compound of a rare earth element and, as cocatalyst, a second component (b) comprising an organomagnesium compound. In the polymerization of a conjugated diene this catalyst gives a polymer having a very high content of trans 1,4 isomer. A third component (c) which is a Lewis acid alters the reaction to give a polymer having a very high content of cis 1,4 isomer. If desired reaction can be initiated using components (a) and (b) alone and component (c) then added at the desired conversion to produce a block polymer having a block of high trans content followed by a block of high cis content.
Inventors
- 👤 Derek K. Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:02
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A process for the homopolymerisation of a conjugated diene or the copolymerisation of a conjugated diene with one or more other conjugated dienes as the sole polymerisable compound to produce a high trans content polymer comprising carrying out the polymerisation in the presence as a catalyst of a mixture of (a) a rear earth compound which is a rare earth carboxylate, a rare earth alkoxide or rare earth diketone complex and (b) a dialkyl magnesium compound as the sole catalyst.
Claim 2
Dependent Claim
80 words
A process for the homopolymerisation of a conjugated diene or the copolymerisation of a conjugated diene with one or more other conjugated dienes as the sole polymerisable compound to produce a high trans content polymer comprising carrying out the polymerisation in the presence as a catalyst of a mixture of (a) a rear earth compound which is a rare earth carboxylate, a rare earth alkoxide or rare earth diketone complex and (b) a dialkyl magnesium compound as the sole catalyst.
Claim 3
Dependent Claim
13 words
A process according to claim 1 wherein (a) is a rare earth carboxylate.
Claim 4
Dependent Claim
11 words
A process according to claim 1 wherein (b) is dibutyl magnesium.
Claim 5
Dependent Claim
13 words
A process according to claim 3 wherein (a) is a rare earth carboxylate.
Claim 6
Dependent Claim
12 words
A process according to claim 1 carried out in a hydrocarbon solvent.
Claim 7
Dependent Claim
19 words
A process according to claim 1 wherein the molar ratio of (a) to (b) is from 0.01:1 to 0.5:1.
Claim 8
Dependent Claim
19 words
A process according to claim 6 wherein the molar ratio of (a) to (b) is from 0.06:1 to 0.3:1.
Claim 9
Dependent Claim
33 words
A process according to claim 1 wherein the rare earth element of the rare earth compound is praseodymium, neodymium, gadolinium, terbium, dysprosium, lanthanum or lutetium or a mixture of such rare earth elements.
Claim 10
Dependent Claim
19 words
A process according to claim 8 wherein the rare earth element is a mixture of neodymium, lanthanum and praseodymium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |