THERMOPLASTIC POLYESTER COMPOSITIONS CONTAINING CERTAIN LOW MOLECULAR WEIGHT DIEPOXIDE RESINS AND HAVING IMPROVED IMPACT BEHAVIOR

摘要

Novel thermoplastic polyester compositions having improved impact behavior are produced. These compositions comprise a blend of poly (C2-C4 alkylene terephthalate) with certain low molecular weight diepoxide resins having a molecular weight between about 350 and about 2,100 and consisting essentially of at least one condensation product of bisphenol A or brominated bisphenol A and epihalohydrin and represented by the general formula (I): Formula (I) wherein X is bromine or hydrogen and n is an average number above zero and less than about 2.3, a triphenyl phosphonium halide catalyst, and a multiphase composite polymer. The multiphase polymer has a first elastomeric phase polymerized from a monomer system including butadiene or butadiene/styrene and a final rigid thermoplastic phase polymerized in the presence of the elastomeric phase.