Method for anionic polymerization of lactames

Details Method for anionic polymerization of lactames Method for anionic polymerization of lactames

C - Chemistry, Metallurgy

08

G

C08G 69/18 (2006.01) C08G 69/20 (2006.01) C08J 5/04 (2006.01) C08K 7/02 (2006.01)

Patent

CA 2368409

The invention relates to a novel method for anionic polymerization of lactames, wherein (a) a catalyst that is capable of creating a lactamate is placed in a solution in the melted lactame (i) along with (ii) a regulator chosen from amides of formula R1-NH-CO-R2, wherein R1 can be substituted by a radical R3-CO-NH- or R3-O- and R1, R2, R3 represent an aryl, alkyl or cycloalkyl radical, whereby the temperature of the reaction mixture ranges between the melting temperature of lactame and 15 ·C above in order to ensure good stability; (b) the solution from step (a) is introduced into a mixing device and is heated to a sufficient temperature so that mass polymerization of the lactame can be obtained in a maximum of 15 minutes; (b) is usually a continuous reactor, e.g. an extruder, but it can be replaced by a mould.

L'invention concerne un nouveau procédé de polymérisation anionique de lactames dans lequel: (a) on met en solution dans le lactame fondu (i) un catalyseur capable de créer un lactamate et (ii) un régulateur choisi parmi les amides de formule R1-NH-CO-R2 dans laquelle R1 peut être substitué par un radical R3-CO-NH- ou R3-O- et dans laquelle R1, R2, R3 désignent un radical aryle, alkyle ou cycloalkyle; la température de ce mélange réactionnel étant comprise entre la température de fusion du lactame et 15 ·C au-dessus afin d'assurer sa bonne stabilité; (b) la solution de l'étape (a) est introduite dans un dispositif mélangeur puis est chauffée à une température suffisante pour obtenir la polymérisation en masse du lactame en 15 minutes au plus; (b) est habituellement un réacteur continu, par exemple une extrudeuse; mais on peut la remplacer par un moule.

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