Differential scanning calorimetry, direct current, thermally stimulated polarization current, and complex permittivity were measured for inflation formed polybutylene succinate, tubular formed polybutylene succinate and tubular formed polybutylene succinate adipate, which are available on the market. Polybutylene succinate formed by the inflation method has the highest conductivity at all the temperatures. Furthermore, only this polymer shows a thermally stimulated polarization current peak around 50°C, which is probably due to ionic impurities. In all the samples, both the permittivity and dielectric loss factor increase significantly with a decrease in frequency. This seems attributable to the motion of ions in the samples.