Stabilized polypyrrolidone composition

A composition comprising a major amount of a normally solid poly-2-pyrrolidone having a weight average molecular weight of about from 35,000 to 100,000 in which at least a major portion of the carboxyl end groups are modified by replacement of hydroxy radical in said carboxyl end group with a capping radical selected from the group consisting-aminoalkylenamine, and a minor amount, effective to improve the melt processability of said modified poly-2-pyrrolidone of an additive, having a boiling point of at least 260.degree. C. and a melting point below about 250.degree. C., selected from the group consisting of epoxides having 2 through 60 carbon atoms and having at least one epoxy oxygen radical linking adjacent carbon atoms;

• polyhydric alcohols;
• organic isocyanates having at least 6 carbon atoms;
• and mixtures thereof and wherein the alkylene moiety of said capping radical has at least two carbon atoms separating the -amino moiety thereof from the end amine moiety thereof;
• and wherein said weight average molecular weight is determined by solution viscosity using a solution containing 0.50 or 1.0 grams of the dried extracted polymer in 10 ml of 88% aqueous formic acid, and applying a Gardner viscosity molecular weight type relationship developed from specific viscosities of 0.1 g of known weight average molecular weight poly-2-pyrrolidone polymers in 100 ml of m-cresol at 25.degree. C.