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EP0091287A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Catalyst for the polymerisation of conjugated dienes

Assignee: Enichem Elastomers Ltd
•
Filing: 1983-03-31
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Granted: —
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Expires: 2003-03-31
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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 polymerisation 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 Keith Jenkins

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 14:40
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 47 words
A catalyst for the homopolymerisation of a conjugated diene or the copolymerisation of a conjugated diene with one or more other conjugated dienes comprising (a) a salt of a rare earth element ' or a complex of a rare earth element and (b) an organo magnesium compound.
Claim 2
Dependent Claim 47 words
A catalyst for the homopolymerisation of a conjugated diene or the copolymerisation of a conjugated diene with one or more other conjugated dienes comprising (a) a salt of a rare earth element ' or a complex of a rare earth element and (b) an organo magnesium compound.
Claim 3
Dependent Claim 27 words
A catalyst according to claim 1 comprising in addition (c) a Lewis acid in a mole ratio of component (c) to component (b) of at least 0.5:1.
Claim 4
Dependent Claim 17 words
A catalyst according to claim I comprising in addition an aluminium trialkyl and a source of halide.
Claim 5
Dependent Claim 24 words
A catalyst according to claim 3 wherein the source of halide is silicon tetrachloride, methyl silicon trichloride carbon tetrachloride, chloroform or an alkyl halide.
Claim 6
Dependent Claim 33 words
A process for the homopolymerisation of-a conjugated diene or the copolymerisation of a conjugated diene with one or more other conjugated dienes using the catalyst of any one of claims 1 to 4.
Claim 7
Dependent Claim 48 words
A process for the preparation of a block copolymer of one or more conjugated dienes comprising polymerising the conjugated diene(s) using a catalyst according to claim and then adding (c) a Lewis acid in a mole ratio of (c):(b) of at least 0.5:1 part way through the polymerisation.
Claim 8
Dependent Claim 28 words
A process for the polymerisation of one or more conjugated dienes and optionally a vinyl aromatic monomer using a catalyst according to claim 1 and a lithium alkyl.
Claim 9
Dependent Claim 23 words
A process according to claim 3 in which the polymerisation is carried out using components (a) and (b) only and a polar compound.
Claim 10
Dependent Claim 13 words
A process according to claim 6 wherein the polar compound is an ether.
Claim 11
Dependent Claim 31 words
A block polymer of one or more conjugated dienes comprising a first block having a high content of trans isomer and a second block having a high content of cis isomer.
Claim 12
Dependent Claim 31 words
A block polymer of one or more conjugated dienes comprising a first block having a high content of trans isomer and a second block having a high content of cis isomer.

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