a process is disclosed for the production of biaxially oriented liquid crystal films . the process includes : forming an anisotropic dope from a polymerization solution of rigid rod heterocyclic liquid crystalline polymers such as polybisthiazole - 2 , 6 - diyl ] 1 , 4 - phenylene }, its cis isomer or mixtures thereof , and polybisoxazole - 2 , 6 - diyl ] 1 , 4 - phenylene }, its cis isomer or mixtures thereof , and a solvent such as polyphosphoric acid ; extruding the dope to form a film ; imparting biaxial orientation to the film to increase the transverse strength thereof ; solidifying the biaxially oriented film ; and washing the solidified film to remove the solvent . also disclosed is a liquid crystal film produced by the above process .