Polysiloxane polyether copolymers which comprise at least one (polyether) moiety, characterized in that at least one (polyether) moiety is present which comprises a unit -O-C -Y-, where Y = mutually independently NR Z, O or S, and R Z = being identical or different, H or alkyl moiety, wherein the polysiloxane polyether copolymer complies with the formula: in which n and n 1 are mutually independently from 0 to 500, preferably from 10 to 200, in particular from 15 to 100 and (n+n 1) ≤ 500, preferably ≤ 200, in particular from > 0 to ≤ 100, m and m 1 are mutually independently from 0 to 60, preferably from 0 to 30, in particular from 0.1 to 25 and (m+m 1) ≤ 60, preferably ≤ 30, in particular from > 0 to ≤ 25, k = 0 to 50, preferably from 0 to 10, in particular from 0 or from 1 to 5, R = identical or non-identical moieties from the group consisting of linear, cyclic or branched, aliphatic or aromatic, saturated or unsaturated hydrocarbon moieties having from 1 to 20 carbon atoms -CH 2 -R IV, -CH 2 -CH 2 - x '-R IV, -CH 2 -CH 2 -CH 2 -O-CH 2 -CH -CH 2 OH, and -CH 2 -CH 2 -CH 2 -O-CH 2 -C(CH 2 OH) 2 -CH 2 -CH 3, where x' is 0 or 1 and R IV is an optionally substituted hydrocarbon moiety optionally substituted with halogens and having from 1 to 50 carbon atoms, where R is preferably a methyl moiety, and where all of the moieties R are particularly preferably methyl moieties, R 1 is mutually independently R or R 3 or R 7, R 2 is mutually independently R or R 3 or R 7 or a functional, saturated or unsaturated, organic moiety substituted with heteroatoms and preferably selected from the group of the alkyl, chloroalkyl, chloroaryl, fluoroalkyl, cyanoalkyl, acryloxyaryl, acryloxyalkyl, methacryloxyalkyl, methacryloxypropyl or vinyl moieties, particularly preferably a methyl, chloropropyl, vinyl or methacryloxypropyl moiety, R 3, being identical or different, is -Q l -X-(R 8 X-) w -(CH 2 -CH 2 O-) x -(CH 2 -CH(R')O-) y -(C -Y) p -R" where 1 = 0 or 1, X = mutually independently NR Z, O or S, preferably NR Z or O, Y = mutually independently NR Z, O or S, preferably O, R Z = being identical or different, H or alkyl moiety, preferably H, Q = divalent hydrocarbon moiety having from 2 to 6 carbon atoms, and preferably Q = -CH 2 -CH 2 -CH 2 - or-CH 2 -CH 2 -, R 8, being identical or different, is a branched or unbranched, cyclic, saturated or unsaturated hydrocarbon moiety having, between the heteroatoms X connected by the hydrocarbon moiety, a carbon chain comprising at least 2 carbon atoms, preferably a linear hydrocarbon moiety -C j H 2j -, where j ≥ 2, preferably j = 4 to 12, and with preference j = from 6 to 10, w = 0 to 200, preferably 1 to 150, with preference 3 to 20, x = 0 to 200, preferably 5 to 140, with preference 10 to 100, y = 0 to 200, preferably 5 to 140, with preference 10 to 100, p = 2 to 10, where the units provided with the indices w, x, y and p can have blockwise or random arrangement, R' = identical or different alkyl or aryl group, unsubstituted or optionally substituted, for example with alkyl moieties, with aryl moieties or with haloalkyl moieties or with haloaryl moieties and having a total of from 1 to 12 carbon atoms, preferably a methyl or ethyl group, with preference a methyl group, and R" = being identical or different, a hydrogen moiety, an alkyl group having from 1 to 30 carbon atoms, a -C -R'" group, where R'" = alkyl moiety, a -CH 2 -O-R' group, an alkylaryl group, e.g. a benzyl group, a -C -O-R'''' group, where R''" = alkyl moiety or alkylaryl, the -C -OR' group, the -C NH-R' group, or a bond to a silicon atom or to a moiety Q bonded to a silicon atom, where the silicon atom can be a constituent of the same polysiloxane skeleton of the formula or of another polysiloxane skeleton of the formula, preferably an alkyl moiety, in particular methyl moiety, or an acetyl moiety, R 7 = crosslinking agent moiety, with the proviso that at least one moiety R 3 is present in which the index p > 0.