Abstract: There is disclosed low carboxyl high molecular weight polyester compositions comprising the product of the reaction of an aziridine compound with the polycondensation product derived from the reaction of a diol and a dicarboxylic acid or C.sub.1 to C.sub.4 alkyl ester thereof and processes for preparing said compositions.

Abstract: High molecular weight, linear copolyester compositions having improved thermo-oxidative stability comprising the condensation product of (A) dicarboxylic acids or the C.sub.1 to C.sub.4 lower alkyl esters thereof, (B) glycols and (C) copolymerizable hindered phenolic comonomers wherein repeat units of said hindered phenolic comonomers are present in the copolyesters in an amount ranging from about 0.1 to 10.0 mol percent based on the dicarboxylic acids or the C.sub.1 to C.sub.4 lower alkyl esters thereof.

Abstract: There is disclosed an improvement in the pigmenting of polyesters derived from free dicarboxylic acids and glycols employing a slurry consisting of pigmenting agent and a glycol which improvement comprises heating said slurry to a temperature ranging from about 90.degree. C. to about 1.degree. to 2.degree. C. below the boiling point of the glycol constituent and adding the heated slurry to the polyester forming reactants when the temperature of said reactants ranges from about 210.degree. to 240.degree. C. and the pressure in the reaction vessel employed ranges from about 20 to 70 pounds per square inch gauge.