FIELD: protection of building materials. SUBSTANCE: in the method for modifying perfluoropolyesters by interaction with metal hydrides in inert solvent when heated said perfluoropolyesters are constituted by the compounds of the general formula T-O-
, where n = 1-15, m/n = 0.01-0.5, R = Cl, Br,F,J; R′ = Cl,Br,F,J; T-group containing 1-3 atoms of carbon and one or two atoms of chlorine, bromine or iodine, X = F,CF3; or their esters. EFFECT: higher efficiency. 3 cl
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