A biaxially oriented film of polyethylene-2,6-naphthalenedicarboxylate.

摘要

A biaxially oriented film of a polyethylene-2,6-naphthalenedicarboxylate, which (1) has a Young's modulus of at least 600 kg/mm<2> in the transverse direction and a Young's modulus of at least 500 kg/mm<2> in the longitudinal direction, the Young's modulus in the transverse direction being greater than the Young's modulus in the longitudinal direction, (2) satisfies the following relationships between an elongation ST (%) in the transverse direction per kg/mm<2> of a load at 120 DEG C and the Young's modulus YT (kg/mm<2>) in the transverse direction,