Composite polymer/polymer material with high content in...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/02 (2006.01) C08L 23/08 (2006.01) C08L 23/12 (2006.01) C08L 67/00 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2405111

The invention concerns a micro-composite polymer/polymer material comprising an amorphous polymer (I) forming a dispersed phase localised inside a thermoplastic or elastomeric polymer (II) forming a matrix, the glass transition temperature of polymer (I) forming a dispersed phase being higher by at least 20 ·C than the melting or softening point of matrix-forming polymer (II), and the amorphous polymer content (I) forming the dispersed phase being not less than 40 wt. %. The invention also concerns a method for obtaining said material comprising steps which consist in: extruding, at regulated temperature, said melted polymer mixture, said regulating temperature being decreasing from the feeding zone (A) to the die zone (F) of said extruding machine (1) so that the material temperature in said die zone (F) is lower than the temperature of recrystallisation or solidification of polymer (II), and higher than the melting or softening point of amorphous polymer (I); and cooling at room temperature the resulting micro-composite material.

La présente invention concerne un matériau micro-composite polymère/polymère, comprenant un polymère amorphe (I) formant une phase dispersée localisée au sein d'un polymère thermoplastique ou élastomère (II) formant matrice, la température de transition vitreuse du polymère (I) formant phase dispersée étant supérieure d'au moins 20 ~C à la température de fusion ou de ramollissement du polymère (II) formant matrice, et la teneur en polymère amorphe (I) formant phase dispersée étant supérieure ou égale à 40 % en poids. L'invention concerne également un procédé pour l'obtention d'un tel matériau comprenant les étapes consistant à: extruder, à température régulée ledit mélange de polymères à l'état fondu, ladite température régulée ledit mélange de polymères à l'état fondu, ladite température de régulation étant décroissante de la zone d'alimentation (A) à la zone de la filière (F)e ladite extrudeuse (1) de sorte que la température matière dans ladite zone de la filière (F) soit inférieure à la température de recristallisation ou de solidification du polymère (II) et supérieure à la température de fusion ou de ramollissement du polymère amorphe (I); et refroidir à température ambiante le matériau micro-composite résultant.

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