Patent ID: 8097684

Claim:
A thermoplastic composition comprising a mixture of a polyamide matrix with at least: (i) a first additive selected from the group consisting of isophthalic acid, terephthalic acid, adipic acid, trimesic acid, 2,2,6,6-tetrakis (β-carboxyethyl)cyclohexanone, 3,5,3′,5′-biphenyltetracarboxylic acid, 1,3,5,7-naphthalenetetracarboxylic acid, 3,5,3′,5′-benzophenonetetracarboxylic acid, and 1,2,4,5-benzenetetracarboxylic acid; and (ii) a second additive (B) obtained by a reaction between at least: a) one monofunctional compound of formula (III): R 3 —Y (III) selected from the group consisting of n-hexadecylamine, n-octadecylamine, n-dodecylamine, and benzylamine; b) one branching compound of formula (IV): Y—R 4 —X m (IV) selected from the group consisting of 5-aminoisophthalic acid, 3,5-diaminobenzoic acid, 3,4-diaminobenzoic acid, and mixtures thereof; c) optionally, one multifunctional compound of formula (I): R 1 —X n (I); and d) one bifunctional monomer of formula (II) or a corresponding cyclic form X—R 2 —Y (II) selected from ε-caprolactam, the corresponding amino acid and mixtures thereof; in which: R 1 , R 2 , R 3 and/or R 4 represent, independently of each other, a hydrocarbon radical optionally comprising one or more heteroatoms; X and Y are antagonist reactive functional groups capable of reacting with each other to form an amide bond; n is an integer ranging from 3 to 50; m is an integer ranging from 2 to 10; and with the proviso that R, R 1 , R 2 , R 3 and R 4 do not comprise an amine, acid or alcohol functional group capable of forming an amide and/or ester bond, and (iii) reinforcing glass fibers, said composition having smooth impact resistance and/or notched impact resistance greater than compositions having the same composition except for the second additive B.