Blends of thermoplastic polyester resins and amorphous polyamides
AssigneeGeneral Electric Company
InventorsDonald C. Clagett, Daniel W. Fox, Louis M. Maresca
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Abstract
Thermoplastic resins of enhanced solvent resistance especially useful for packaging or automotive parts comprising blends of amorphous polyamides with a thermoplastic polyester resin, substantially free of a polyarylate have excellent physical properties and barrier resistance to oxygen and carbon dioxide. Preferred blends comprise polyesters prepared by reacting a dihydric alcohol with a dicarboxylic acid, and amorphous polyamides prepared from non-symmetric monomers comprising odd-number chain diamines and diacids, and meta aromatic diamines and diacids.
Claims14
A method for enhancing the barrier resistance of a molded article to oxygen and carbon dioxide consisting of (a) blending a composition consisting entirely of a thermoplastic polyester resin having an intrinsic viscosity of from about 0.4 to about 2.0 dl/g as measured in a 60:40 phenol:tetrachlorethane mixture at 23.degree.-30.degree. C. containing less than 2% of wholly aromatic resin moieties and an effective barrier-resistance-improving amount of an amorphous polyamide resin;
- and (b) molding said blend into an article of specific dimensions by extrusion or injection molding.
A method as defined in claim 16 wherein said polyester comprises units derived from ethylene glycol, 1,4-butanediol, polybutylene oxide diol, 1,4-cyclohexanedimethanol or a mixture of any of the foregoing.
A method for enhancing the barrier resistance of a molded article to oxygen and carbon dioxide consisting of (a) blending a composition consisting entirely of a thermoplastic polyester resin having an intrinsic viscosity of from about 0.4 to about 2.0 dl/g as measured in a 60:40 phenol:tetrachlorethane mixture at 23.degree.-30.degree. C. containing less than 2% of wholly aromatic resin moieties and an effective barrier-resistance-improving amount of an amorphous polyamide resin;
- and (b) molding said blend into a film or sheet product.
A method for enhancing the barrier resistance of a molded article to oxygen and carbon dioxide consisting of (a) blending a composition consisting entirely of a thermoplastic polyester resin having an intrinsic viscosity of from about 0.4 to about 2.0 dl/g as measured in a 60:40 phenol:tetrachlorethane mixture at 23.degree.-30.degree. C. containing less than 2% of wholly aromatic resin moieties and an effective barrier-resistance-improving amount of an amorphous polyamide resin;
- and (b) injection molding said blend into an article.
Dependencies are inferred from the claim text.