Solid phase ion conductors have been the object of studies during the last years for their potential use as conducting polymer matrices in electrochromic devices, sensors, photovoltaic and dry batteries. Comb polymers of poly(styrene) with oligo(ethylene oxide) side chains were investigated. They show reasonable conductivity of about 10(-7)-10(-5) siemens/cm at ambient temperature and lithiumperchlorate as salt electrolyte. A dependence of the conductivity from the side chain length and the amount of added salt was found.