High impact resistant polyamide

Claim 1

A thermoplastic composition having high impact resistance at low temperatures, said composition consisting essentially of an amorphous polyamide matrix resin, said polyamide having an apparent melt viscosity of 3000 poise or more, as measured at 280° C. and a shear rate of 100 sec. -1 , said amorphous polyamide being present in the composition in the amount of about 75 to 85% by weight of the composition, and copolymer particles that are dispersed in said amorphous polyamide said copolymer particles having a particle size, as determined by small angle X-ray scattering, of less than about 360 nm, said copolymer particles being selected from the class consisting of (a) copolymer having a Mooney viscosity of 40 to 60, containing 66 to 70% by weight ethylene, 24 to 28% by weight propylene, 5.9 to 6.4% by weight hexadiene, and 0.1 to 0.16% by weight norbornadiene, grafted with succinic anhydride groups in the amount of 0.25 to 2.25% by weight of the copolymer and (b) mixtures of (a) with the ungrafted copolymers of (a), such mixtures containing at least about 35% by weight of (a), said copolymer particles being present in an amount of at least 15% by weight the composition.