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1. WO2020070406 - METHOD FOR SYNTHESISING A THERMOPLASTIC ELASTOMER COMPRISING AT LEAST ONE POLY(ALPHA-METHYLSTYRENE) BLOCK

Publication Number WO/2020/070406
Publication Date 09.04.2020
International Application No. PCT/FR2019/052214
International Filing Date 23.09.2019
IPC
C08F 297/04 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
297Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
02using a catalyst of the anionic type
04polymerising vinyl aromatic monomers and conjugated dienes
B60C 1/00 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
1Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
C08F 212/12 2006.01
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
212Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
02Monomers containing only one unsaturated aliphatic radical
04containing one ring
06Hydrocarbons
12containing a branched unsaturated aliphatic radical or an alkyl radical attached to the ring
CPC
B60C 1/00
BPERFORMING OPERATIONS; TRANSPORTING
60VEHICLES IN GENERAL
CVEHICLE TYRES
1Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
C08F 212/12
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
212Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
02Monomers containing only one unsaturated aliphatic radical
04containing one ring
06Hydrocarbons
12Monomers containing a branched unsaturated aliphatic radical or a ring substituted by an alkyl radical
C08F 297/044
CCHEMISTRY; METALLURGY
08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
FMACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
297Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
02using a catalyst of the anionic type
04polymerising vinyl aromatic monomers and conjugated dienes
044using a coupling agent
Applicants
  • COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN [FR]/[FR]
Inventors
  • COSTE, Nathalie
  • DIRE, Charlotte
  • HABHAB, Karima
  • MAXIMIANO-RAIMUNDO, Pedro
Agents
  • LE CAM, Véronique
Priority Data
185911702.10.2018FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) METHOD FOR SYNTHESISING A THERMOPLASTIC ELASTOMER COMPRISING AT LEAST ONE POLY(ALPHA-METHYLSTYRENE) BLOCK
(FR) PROCÉDÉ DE SYNTHÈSE D'UN ÉLASTOMÈRE THERMOPLASTIQUE COMPRENANT AU MOINS UN BLOC POLY(ALPHA-MÉTHYLSTYRÈNE)
Abstract
(EN)
The invention relates to a method for synthesising a thermoplastic elastomer comprising at least one polydiene block and at least one poly(α-methylstyrene) block. This method comprises the polymerisation steps comprising, successively: - polymerising the α-methylstyrene in an initial reaction medium comprising an anionic polymerisation initiator and an apolar solvent in the presence of a polar compound, the molar ratio of the polar compound to the metal of the polymerisation initiator being at least 0.03 and at most 15, with a mass ratio of the solvent to the α-methylstyrene of at least 0.5 and at most 5, and at a temperature higher than or equal to 0°C and lower than 30°C; - adding, in a single step, all of the monomer or monomers that are to constitute the polydiene block, the monomer or monomers comprising at least one conjugated diene monomer; - polymerising the monomer or monomers that are to constitute the diene block on the living poly(α-methylstyrene) chains obtained previously, at a temperature higher than or equal to the polymerisation temperature of the α-methylstyrene. The method of the invention makes it possible to synthesise a thermoplastic elastomer of controlled microstructure and controlled macrostructure, the thermoplastic block(s) of which are homopolymers of α-methylstyrene and may have a glass transition temperature higher than the glass transition temperature of polystyrene at 100°C, with a reduced number of steps and productivity that is economically compatible with industrial exploitation.
(FR)
L'invention concerne un procédé de synthèse d'un élastomère thermoplastique comprenant au moins un bloc polydiène et au moins un bloc poly(α-méthylstyrène). Ce procédé comprend les étapes de polymérisation comprenant successives : - la polymérisation de l'α-méthylstyrène dans un milieu réactionnel de départ comprenant un initiateur de polymérisation anionique et un solvant apolaire en présence composé polaire, le rapport molaire du composé polaire au métal de l'initiateur de polymérisation d'au moins 0,03 et d'au plus 15, avec un rapport massique du solvant à l'α-méthylstyrène d'au moins 0,5 et d'au plus 5 et à une température supérieure ou égale à 0°C et inférieure à 30°C; - l'ajout en une seule fois de la totalité du ou des monomères devant constituer le bloc polydiène, le ou les monomères comprenant au moins un monomère diène conjugué; - la polymérisation du ou des monomères devant constituer le bloc diénique sur les chaînes poly(α-méthylstyrène) vivantes obtenues précédemment, à une température supérieure ou égale à la température de polymérisation de l'α-méthylstyrène. Le procédé de l'invention permet de synthétiser un élastomère thermoplastique de microstructure et macrostructure contrôlées, dont le ou les blocs thermoplastiques sont des homopolymères de l'α-méthylstyrène et peuvent présenter une température de transition vitreuse supérieure à la température de transition vitreuse du polystyrène à 100°C, avec un nombre d'étapes réduit et une productivité économiquement compatible avec une exploitation industrielle.
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