We study corona electrets made on the basis of a statistical co-polymer of trifluorochloroethylene and vinyliden fluoride and its compositions with a titanium dioxide. It is shown that a co-polymer have two levels of capture of injected charge carriers that result in high and stable electret properties. We obtain an extreme dependence of a surface potential and an effective surface density of charge of electret compositions on volume fraction of filler; the maximum value is reached at 6 volume percent. The increase in electret properties of compositions in course of loading of filler arises from generation of new levels of charge capture at an inter-phase boundary “co-polymer – filler”; the subsequent decrease in electret properties is due to the rise of an electric conductivity of the composition. It follows from stable electron properties of fluoroplastic compositions that the composite materials studied are of practical significance in the field of electret coatings.