C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 77/00 (2006.01)
Patent
CA 2209977
The invention concerns compositions containing at least one polyamide (A) and at least one copolymer (B) of ethylene and of at least one unsaturated carboxylic acid anhydride (or acid). These compositions are such that the impact/flow (I/F) index for compositions containing 90 parts of (A) to 10 parts of (B) is greater than 1.5 when the compositions contain essentially no glass fibres, and such that the I/F index for compositions containing 60 parts of (A) to 10 parts of (B) plus glass fibres is greater than 0.9. The I/F index is defined as the ratio of (i) the product of the Izod notch impact resistance at 23 degrees C and the melt flow index (MFI), to (ii) the product of the impact resistance and the MFI of the same composition without (B). These compositions can be used for producing injection-moulded parts, in particular fine articles of large size which are shock-resistant.
L'invention concerne des compositions comprenant au moins un polyamide (A) et au moins un copolymère (B) de l'éthylène et d'au moins un anhydride d'acide (ou acide) carboxylique insaturé. Ces compositions sont telles que l'indice choc/fluidité (CF) des compositions comprenant 90 parties de (A) pour 10 parties de (B) est supérieur à 1,5 lorsque les compositions ne contiennent essentiellement pas de fibres de verre, et telles que l'indice CF des compositions comprenant 60 parties de (A) pour 10 parties de (B) et des fibres de verre est supérieur à 0,9. L'indice CF est défini comme le rapport du produit (i) du choc entaillé lZOD à 23°C par le MFi (Melt flow index) de la composition comprenant (A) et (B) au produit (ii) du choc par le MFi de la même composition mais ne comprenant pas (B). Ces compositions sont notamment utilisables pour la production de pièces injectées en particulier des pièces fines et de grandes dimensions résistantes au choc.
Bouilloux Alain
Perret Patrice
Elf Atochem S.a.
Robic
LandOfFree
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