Polyester compositions for blow molding

Claim 1

A melt-blend of a mixture consisting essentially of: (a) 70-90 parts by weight of a semicrystalline polyester; (b) 10-30 parts by weight of an epoxide-group containing copolymer containing recurring units of monomer of the formula (1) CH 2 ═C(R)COOCH 2 CHCH 2 O wherein R═H or lower alkyl of 1-6 carbon atoms and recurring units of one or more monomers selected from the group consisting of (2) CH 2 ═CHR where R═H, lower alkyl, or phenyl, (3) CH 2 ═C(R 1 )COOR 2 where R 1 ═H or lower alkyl and R 2 ═alkyl of 1-8 carbon atoms, (4) RCOOCH═CH 2 where R═lower alkyl, and (5) CO; and (c) 0.01 to 3.0 parts by weight of a source of catalytic cartons selected from the group consisting of metal salts of hydrocarbon mono-, di-, or poly-carboxylic acids and metal salts of organic polymers containing carboxyl groups, said cations being selected from the group consisting of Al 30 ++, Cd ++ , Co ++ , Cu ++ , Fe ++ , In +++ , Mn ++ , Nd +++ , Sb +++ , Sn ++ , and Zn ++ and provided that the source of catalytic cations imparts into the melt blend 0.05 to 0.5 millimoles of catalytic cation per 100 grams of components (a) and (b) combined.