Flexible polyamide composition

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/26 (2006.01) C08L 23/16 (2006.01) C08L 51/06 (2006.01) C08L 53/00 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2275709

The invention relates to a flexible polyamide composition containing at least 50 parts by weight of non-cross-linked rubber per 50 parts by weight of polyamide and the production thereof. The polyamide has a molecular weight such that the melt viscosity at the processing temperature is at most 300 Pa.s, preferably at most 200 Pa.s. The rubber's Mooney viscosity is at least 40, most preferable is a rubber with a Mooney viscosity of at least 60. The rubber has been functionalized. Preferably a combination of a functionalized and a non-functionalized rubber is used. The rubber particles in the polyamide matrix have a particle size of at most 5 µm, preferably at most 3 µm.

L'invention concerne une composition de polyamide flexible contenant au moins 50 parties en poids de caoutchouc non réticulé pour 50 parties en poids de poylamide, ainsi que sa production. Le polyamide présente une masse moléculaire telle que la viscosité à l'état fondu à la température de traitement se situe au plus à 300 Pa.s, de préférence au plus 200 Pa.s. La consistance Mooney du caoutchouc est d'au moins 40, un caoutchouc d'une consistance Mooney d'au moins 60 est préférable. Le caoutchouc a été fonctionnalisé. De préférence, on utilise une combinaison d'un caoutchouc fonctionnalisé et d'un caoutchouc non fonctionnalisé. Les particules de caoutchouc se trouvant dans la matrice de polyamide présentent une grosseur de particule au plus de 5 µm, de préférence au plus de 3 µm.

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