Thermoplastic blow moldable polyester compositions

Claim 1

A semi-crystalline extrusion blow-moldable polyester composition which comprises a melt blend of a) 65-92 weight percent of at least one polyester selected from the group consisting of linear poly(ethylene terephthalate) PET having an inherent viscosity of at least 0.65 dl/g, branched PET having an inherent viscosity of at least 0.60 dl/g, mixtures of such PET's, poly(butylene terephthalate) having an inherent viscosity of at least 0.8 dl/g and mixtures of such PET's and PBT's, provided the latter mixtures contain no more than 20 weight percent PET, b) 4-17 weight percent of at least one ethylene copolymer, E/X/Y, where E is ethylene at least 50 weight percent, X is glycidyl methacrylate from 2-10 weight percent and Y is from 0-40 weight percent of a moiety derived form C 1 -C 6 alkyl(meth)acrylate, c) 2-10 weight percent of at least one methyl methacrylate copolymer which contains 49-98 weight percent of units derived from methyl methacrylate, 2-11 weight percent of units derived from glycidyl(meth)acrylate and 0-40 weight percent of units derived from a group consisting of methyl acrylate and C 2 -C 6 alkyl(meth)acrylate, provided that the methyl methacrylate copolymer has an epoxide functionality of at least 2.5, and d) 2-8 weight percent of at least one ionomer obtained by neutralizing with Na+ or K+ at least 40 percent of the carboxyl groups in an ethylene copolymer which contains about 9-20 weight percent of units derived form (meth)acrylic acid and 0-35 weight percent of units derived from C 1 -C 6 alkyl (meth)acrylate, with the weight percentages of components a), b), c) and d) being based on the total of those components only.