Pet Container and Compositions Having Enhanced Mechanical Properties and Gas Barrier Properties

A container comprising a polyester composition comprising a polyester, a creep control agent, and a gas barrier enhancing additive;

• wherein the creep control agent comprises a compound having the chemical structure of Formula I:
• wherein R1, R2, R3, and R4, independent of one another, may comprise a heteroatom, a tetravalent carbon atom, or a C1-C3 divalent or trivalent hydrocarbon;
• wherein each heteroatom, tetravalent carbon atom, or C1-C3 divalent or trivalent hydrocarbon may be unsubstituted or substituted with one or more functional moieties or one or more C1-C10 hydrocarbyls that may be unsubstituted or substituted with one or more functional moieties;
• wherein i, ii, iii, iv, v, and vi, independent of one another, comprise a single, double, or triple bond;
• wherein when i is a double bond, ii and vi are single bonds;
• wherein when ii is a double bond, i and iii are single bonds;
• wherein when iii is a double bond, ii and iv are single bonds;
• wherein when iv is a double bond iii and v are single bonds;
• wherein when v is a double bond, iv and vi are single bonds;
• wherein when vi is a double bond, i and v are single bonds;
• wherein vii may be a single bond, double bond, or no bond at all connects R3 and R4;
• wherein m, n, o, and p, independent of one another, may be 0 or 1;
• wherein when m is 0, bonds ii and iii form a single continuous bond;
• wherein when n is 0, bonds vi and v form a single continuous bond;
• wherein when o is 0, R4 is bonded to R1 by a single bond;
• and wherein when p is 0, R3 is bonded to R2by a single bond;
• wherein the creep control agent is present in the polyester composition in an amount from about 200 to about 2000 ppm;
• wherein the gas barrier enhancing additive comprises a compound having the chemical structure of Formula A or Formula B:
• wherein X and X6, independent of one another, comprise hydrogen, halide, heteroatom, hydroxyl, amino, amido, alkylamino, arylamino, alkoxy, aryloxy, acyl, or a C1-C10 monovalent hydrocarbon which is unsubstituted or substituted with one or more functional moieties;
• wherein X1, X2, X3, X4, and X5, independent of one another, comprise a heteroatom or a C1-C10 divalent hydrocarbon, wherein each heteroatom or C1-C10 divalent hydrocarbon is unsubstituted or substituted with one or more functional moieties or one or more C1-C10 hydrocarbyls that are unsubstituted or substituted with one or more functional moieties;
• and
• wherein s, t, u, and v, independent of one another, is a number from 0 to 10;
• wherein when X3 comprises a C6 or C10 divalent aromatic hydrocarbon, s and v are 0, and X and X6, independent of one another, comprise a hydrogen, halide, heteroatom, hydroxyl, amino, amido, alkylamino, arylamino, alkoxy, aryloxy, acyl, or a C3-C10 monovalent cyclic or heterocyclic non-aryl hydrocarbon that are unsubstituted or substituted with one or more functional moieties;
• and
• wherein the container is substantially free of haze and color.