Dispersions of high carboxyl polyamides into polyesters using an interfacial tension reducing agent

1. A stretched wall of a container comprised of at least one stretched layer, said stretched layer comprising

a polyamide polymer, a crystallizable polyester and an interfacial tension reducing agent,

wherein

the polyamide polymer comprises a reaction product selected from the group consisting of the reaction product of amino caproic acid with itself and the reaction product of A-D where A is a residue of a dicarboxylic acid comprising adipic acid, isophthalic acid, terephthalic acid, 1,4 cyclohexanedicarboxylic acid, or naphthalenedicarboxylic acid and where D is a residue of a diamine comprising m-xylylene diamine, p-xylylene diamine, hexamethylene diamine, ethylene diamine, or 1,4 cyclohexanedimethylamine, wherein the amino to carboxyl end group ratio of the polyamide polymer is less than 0.20,

at least 85% of the crystallizable polyester's acid units are derived from the group consisting of terephthalic acid, 2,6 naphthalene dicarboxylic acid, the dimethyl ester of terephthalic acid, or the dimethyl ester of 2,6 naphthalene dicarboxylic acid

and the interfacial tension reducing agent is copolymerized into the polyester which may be the crystallizable polyester or may be a second polyester component.

2. The wall of claim 1 wherein the polyamide polymer is MXD6.

3. The wall of claim 2 wherein the interfacial tension reducing agent comprises a metal sulfonate.

4. The wall of claim 2 wherein the interfacial tension reducing agent comprises lithium.

5. The wall of claim 1 wherein the polyamide polymer is nylon 6.

6. The wall of claim 5 wherein the interfacial tension reducing agent comprises a metal sulfonate.

7. The wall of claim 5 wherein the interfacial tension reducing agent comprises lithium.