Polynaphthoylenebenzimidazoles, copolynaphthoylenebenzimidazolophenylq
uinoxalines and copolynaph-thoylenebenzimidazolonaphthylimides were ob
tained by high-temperature catalytic polycyclocondensation in phenolic
solvents. All polymers obtained demonstrate high oxygen index values
depending on polymers structure and naphthoylenebenzimidazole rings co
ntent in copolymers.