Polyamid and polyolefin mixture article containing a...

C - Chemistry – Metallurgy – 08 – L

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C08L 77/00 (2006.01) C08L 23/02 (2006.01) C08L 23/26 (2006.01)

Patent

CA 2133703

The invention relates to an object made from a blend of polyamide and polyolefin comprising at least one healing line and is distinguished by the viscosity ratio of the polyolefin to the polyamide measured at a shear rate exceeding 100 s-1 is greater than .70 and the quantity of polyamide is such that its elongation at break exceeds 10%. This invention solves many problems associated with the process of injecting polyamide/polyolefin blends, in particular, improving healing lines and reducing superficial delamination. Injected parts have improved mechanical properties.

L'invention concerne un objet à base d'un mélange de polyamide et de polyoléfine qui comprend au moins une ligne de ressoudure et est caractérisé en ce que le rapport des viscosités de la polyoléfine au polyamide mesuré à une vitesse de cisaillement supérieure à 100 s-1 est supérieur à 0,70 et la quantité de polyamide est suffisante pour que l'allongement à la rupture soit supérieur à 10%. Cette invention permet notamment de résoudre en grande partie les problèmes liés au procédé d'injection des mélanges polyamide/polyoléfine, en particulier d'améliorer la tenue des lignes de soudures, et de réduire le phénomène de délaminage superficiel. Par ailleurs, les pièces injectées ont des propriétés mécaniques améliorées.

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