Biaxially oriented film of polyethylene-2,6-naphthalenedicarboxylate.

摘要

A biaxially oriented film of a polyethylene-2,6-naphthalenedicarboxylate, which (A) has a Young's modulus of at least 800 kg/mm<2> in the longitudinal direction and a Young's modulus of at least 500 kg/mm<2> in the transverse direction, the Young's modulus in the longitudinal direction being greater than the Young's modulus in the transverse direction, (B) satisfies the following relationships between an elongation SM (%) in the longitudinal direction per a load of 1 kg/mm<2> 120 DEG C and the Young's modulus YM (kg/mm<2>) in the longitudinal direction,