Patent ID: 7175896

Claim:
A layered composite, comprising the following layers: (I) a layer I composition comprising: (a) from 0 to 80 parts by weight of at least one polyamide selected from the group consisting of PA6, PA66, PA6/66 and mixtures thereof (b) from 0 to 100 parts by weight of at least one polyamine-polyamide copolymer comprising the following monomer units: (α) from 0.5 to 25% by weight, based on the weight of the polyamine-polyamide copolymer, of at least one polyamine having at least 4 nitrogen atoms and having a number-average molar mass M n of at least 146 g/mol, and (β) at least one polyamide-forming monomer selected from the group consisting of lactam, ω-aminocarboxylic acid, equimolar combination of diamine and dicarboxylic acid, and mixtures thereof, wherein component (b) is present; and (c) from 0 to 80 parts by weight of at least one polyamide selected from the group consisting of PA11, PA12, PA612, PA1012, PA1212 and mixtures thereof; wherein, in said layer I, a total of the parts by weight of(a), (b) and (c) is 100; wherein within an entirety of (a) and (b), at least 20 parts by weight of said entirety comprise monomer units selected from the group consisting of caprolactam, combination of hexamethylenediamine/adipic acid, and mixtures thereof and wherein within an entirety of (b) and (c), at least 20 parts by weight of said entirety comprise monomer units selected from the group consisting of ω-aminoundecanoic acid, laurolactam, combination of hexamethylenediamine/1,12-dodecanedioic acid, combination of 1,10-decanediamine/1,12-dodecanedioic acid, combination of 1,12-dodecanediamine/1,12-dodecanedioic acid, and mixtures thereof; and (II) a layer II composition comprising at least one ethylene-vinyl alcohol copolymer; wherein the composite comprises the following sequence of layers: (i) a layer comprising at least one member selected from the group consisting of PA11, PA12, PA612, PA1012, PA1212, and combinations thereof; (ii) layer I; (iii) layer II; and (iv) a layer comprising at least one member selected from the group consisting of PA6, PA66, PA6/66, and combinations thereof.