The invention herein provides a method to improve retention of tensile
properties upon aging in poly(trimethylene terephthalate) cast film. The
method involves first nucleating the poly(trimethylene terephthalate)
resin prior to film formation and controlling the quench temperature
during casting of the film. The quench temperature should be controlled to
a temperature in the range of from about 10.degree. C. below the Tg of the
poly(trimethylene terephthalate) to about 15.degree. C. above the Tg of
the poly(trimethylene terephthalate).
