| abstract |
A process in which a wound roll of biaxially oriented polyester film having a glass transition temperature (Tg (° C.)) is annealed at a temperature T a (° C.) above Tg where Tg<T a ≦Tg+100 (° C.) for a time t after thermal equilibrium where 1 hour≦t≦72 hours and cooled, for the purpose of improving the shrinkage of said polyester film. |