Polyester modified with alkyl- or alkenylsuccinic anhydrides

A composition comprising a copolyester having a melting point of about 70.degree. C. to about 200.degree. C. and an inherent viscosity of about 0.4 to about 1.2, said copolyester containing the following divalent radicals:

• ##STR3## (B) at least one of --O--Y--O-- and --O--CH.sub.2 --CH.sub.2 --O--CH.sub.2 --CH.sub.2 --O--, and ##STR4## wherein X is comprised of at least 65 mole % of a divalent p-phenylene radical and 0 to 35 mole % of at least one divalent radical selected from m-phenylene, 2,6-naphthylene, 5-sodiosulfo-1,3-phenylene, and divalent cycloaliphatic radicals and primary aliphatic hydrocarbon radicals containing 2 to 34 carbon atoms, Y is a divalent aliphatic or cycloaliphatic radical containing 2 to 8 carbon atoms, and R.sub.1 is selected from alkyl or 1-alkenyl radicals containing 3 to 30 carbon atoms, and wherein said copolyester is further characterized in that radical (A) is present in the amount of 98 to 60 mole percent, radical (B) is derived from at least 10 mole percent 1,6 hexanediol and radical (C) is in the amount of about 2 to about 40 mole percent.