Micro-composite polymer/polymer materials with...

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 2405282

The invention concerns a micro-composite polymer/polymer material comprising 25 to 35 wt. % of a semicrystalline polymer (I), forming a dispersed phase localised inside a thermoplastic or elastomeric polymer (II) forming a matrix, the temperature of crystallisation of the polymer forming a dispersed phase being higher by at least 20 ·C than the melting or softening point of polymer (II) forming the matrix, and the dispersed phase of said material having specifically a morphology such that it induces crosslinking of the continuous phase. The invention also concerns a method for obtaining said material comprising steps which consist in: extruding, at regulated temperature, said mixture of melted polymers, said regulation temperature being decreasing from the feeding zone (A) to the die zone (F) of said extruding machine (1) so that the temperature of the material in said die zone (F) is lower than the temperature of recrystallisation or solidification of polymer (I) and higher than the melting or softening point of polymer (II); and cooling at room temperature the resulting micro-composite material.

La présente invention concerne un matériau micro-composite polymère/polymère, comprenant de 25 à 35 % en poids d'un polymère semi-cristallin (I), formant une phase dispersée localisée au sein d'un polymère thermoplastique ou élastomère (II) formant matrice, la température de cristallisation du polymère formant une phase dispersée étant supérieure d'au moions 20~C à la température de fusion ou de ramollissement du polymère (II) formant matrice, et la phase dispersée dudit matériau possédant spécifiquement une morphologie telle qu'elle induit une réticulation de la phase continue. 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'ètat fondu, ladite température de régulation étant décroissante de la zone d'alimentation (A) à la zone de la filière (F) de 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 (I) et supérieure à la température de fusion ou de ramollissement du polymère (II); et refroidir à température ambiante le matériau micro-composite résultant.

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