Molding composition from polyester blends

Claim 1

A polyester composition having a balance of properties suitable for molding purposes, said balance of properties including a flexural modulus of at least 200,000 psi, a heat deflection temperature at 264 psi of at least 50° C., a tensile strength of at least 5000 psi, a notched Izod impact strength at 23° C. of at least 0.7 foot-pounds per inch, an unnotched Izod impact strength at 23° C. of no break, and a Rockwell Hardness using the R scale of at least 90; said polyester composition comprising an admixture of (A) from about 70 to about 90 percent by weight of a polyester having an inherent viscosity of about 0.5 to about 1.5, and selected from (1) poly(tetramethylene terephthalate), (2) poly(1,4-cyclohexylenedimethylene terephthalate), and (3) poly(1,4-cyclohexylenedimethylene terephthalate) modified with up to about 10 percent by weight of poly(oxyethylene) glcyol having a molecular weight of about 500 to about 2000. (B) from about 25 to about 5 percent by weight of poly(ethylene-co-propylene) rubber having a melt flow at 230° C. ranging from about 0.1 to about 20.0 grams/10 minutes, and (C) from about 5 to about 25 percent by weight of an ionomer of poly(ethylene-co-acrylic acid) with about 50 percent of the acrylic acid converted to a metal salt and having a melt index at 190° C. ranging from about 3 to about 20 grams/10 minutes.