Abstract: The invention relates to polyester/polyamide blend compositions for forming an article having low haze and reduced gas permeability compared to the polyester alone. More specifically, the invention relates to blends of semi-crystalline polyesters such as PET with low molecular weight polyamides and to the containers and packages for food, beverages, cosmetics, pharmaceuticals and personal care products that can be fabricated from these blends.

Abstract: The present invention involves the preparation and use of polyester blend containing at least one acid terminated polyamide which give the improved color as compared to the prior art. The present invention comprises polyester blend composition having improved color comprising: (A) about 99.98 to about 95 weight percent of a polyester which comprises (1) a dicarboxylic acid component comprising repeat units from at least 85 mole percent terephthalic acid, and (2) a diol component repeat units from at least 85 mole percent ethylene glycol, based on 100 mole percent dicarboxlic acid and 100 mole percent diol; and (B) acid terminated polyamide.

Abstract: The present invention is a compositional blend having a polyester, an acetaldehyde reduction compound and less than 50 ppm of an optical brightener. The blend has utility for food and beverage molded containers where improved clarity and flavor retention are important without producing a haze. The acetaldehyde reduction compound can be a low molecular weight partially aromatic polyamide, a low molecular weight aliphatic polyamides or polyesteramide. The optical brightener preferably is a bis(benzoxazolyl) stilbene. Articles, and especially beverage containers, produced from the blend have a yellowness, b*, less than about 2.5.

Abstract: The present invention comprises polyester blend compositions having improved flavor retaining properties and color, comprising:(A) 98.0 to 99.95 weight percent of a polyester which comprises(1) a dicarboxylic acid component comprising repeat units from at least 85 mole percent terephthalic acid or naphthalenedicarboxylic acid derived from terephthalic acid or naphthalenedicarboxylic acid respectively; and(2) a diol component comprising repeat units from at least 85 mole percent ethylene glycol, based on 100 mole percent dicarboxylic acid and 100 mole percent diol; and(B) 2.0 to 0.05 weight percent of a polyamide; wherein the combined weights of (A) and (B) total 100 percent.