US Patent 7151136 Polyamide thermoplastic compositions with improved impact strength properties

The invention relates to a polyamide-based thermoplastic composition comprising, by weight:50 to 98 parts of a polyamide (A1) nondiamine;0.2 to 40 parts, preferably 0.2 to 9 parts, of a polyamide (A2) diamine, said polyamide (A2) being different from the polyamide (A1) and the ratio by mass (A2)/(A1) being less than 1;1 to 60 parts, preferably 1 to 30 parts, of a reactive impact modifier (B) or of a blend of modifiers comprising at least one reactive impact modifier (B) or of a blend (B′) comprising at least one impact modifier and at least one reactive modifier.