Use of water-insoluble polyoxyarylene-polysiloxane-mass copolymers for defoaming of aqueous media

摘要

Water-insoluble polyoxyarylene-polysiloxane block copolymers with oxy-aralkylene groups in side-chain blocks are used as foa suppressants for aqueous media. The use of water-insoluble polyoxyarylene-polysiloxane block copolymers of formula (I) as foam suppressants for aqueous med is claimed; R<1> and/or R<7> = R<2> or -(R<4>)w-(R<5>)x-(R<6>)-R<8>; R<2>, R<3> = 1-24C alkyl or optionally substituted phenyl with up to 24 C atoms; R<4> = -O-, -NH-, -NR<2>-, -S- or -(O-Si(CH3)2)u-; u = 2-200; R<5> = 1-24C alkylene or -CnH2n-f-(R<2>)f-O-CmH2m-g-(R<2>)g-; f, g = 0-12; n, m = 1-18; R<6> = -O-(C2H4-aR<9>aO)b-(C2H4-aR<10>aO)c-, with any sequence of polyoxyalkylene and/or polyoxyarylene segments, especially block copolymers such as statistical polymers and combinations of these; R<9> = 1-4C alkyl; R<10> = a group of formula (II), with the proviso that the total content of C2H4O groups in all residues R<6> is not more than 40 wt%; R<11> = H, 1-12C hydrocarbyl or halogen; a = 0-3; b = 0-100; c = 1-100; (b+c) = 3-200; R<8> = H, optionally substituted 1-6C alkyl or acyl; v = 3-200; w, x = 0 or 1; y = 0-200, with R<1> and/or R<7> = -(R<4>)w-(R<5>)x-(R<6>)-R<8> if y = 0.