Polyester and polyesteramide compositions

A textile fiber sizing composition comprising an aqueous dispersion containing from about 0.1 to about 50% by weight, based on the combined weight of polymer and water, of a linear, water-dissipatable polymer having carbonyloxy linking groups in he linear molecular structure wherein up to 80% on the linking groups may be carbonylamido linking groups, the polymer having an inherent viscosity of at least about 0.1 measured in a 60/40 parts by weight solution of phenol/tetrachloroethane at 25.degree. C. and at a concentration of about 0.25 gram of polymer in 100 ml. of the solvent, the polymer containing substantially equimolar proportions of acid equivalents (100 mole percent) to hydroxy and amino equivalents (100 mole percent), the polymer comprising the reaction products of (a), (b), and (c) from the following components or ester forming or ester-amide forming derivatives thereof;

• (a) at least one difunctional dicarboxylic acid;
• (b) from about 4 to about 25 mole percent, based on a total of all acid, hydroxyl and amino equivalents being equal to 200 mole percent, of at least one difunctional sulfomonomer containing at least one metal sulfonate group attached to aromatic nucleus wherein the functional groups are hydroxy, carboxyl or amino;
• and
• (c) at least one difunctional reactant selected from a glycol or a mixture of a glycol and diamine having two --NRH groups, the glycol containing two --CH.sub.2 --OH groups of which from about 0.1 to less than 15 mole percent based on the total mole percent of hydroxy or hydroxy and amino equivalents, is a poly(ethylene glycol) having the structural formula:
• H--OCH.sub.2 -CH.sub.2).sub.n OH
• n being an integer of between 2 and about 500, and with the proviso that the mole percent of said poly(ethylene glycol) within said range is inversely proportional to the quantity of n within said range.