Compositions of polymers based on acrylic acid, solvents, surfactants and, if appropriate, silicone oils, their preparation and their use as anti-foams and deaerating agents

Claim 1

A surfactant-containing composition, consisting essentially of (a) 8 to 30 percent by weight of a homopolymer of an aliphatic C 1 -C 8 -alkyl acrylate or methacrylate or a copolymer of this alkyl ester with styrene or acrylic or methacrylic acid, (b) 10 to 40 percent by weight of a hydronaphthalene, an alkylbenzene, an acyclic or cyclic alkanol having 4 to 12 carbon atoms, an alkylene oxide adduct of a polyhydric alcohol having 2 to 6 carbon atoms or a maleate of aliphatic C 4 -C 22 -alcohols, (c) 0 to 20 percent by weight of a hydrophobic silicone oil, (d) 0 to 10 percent by weight of an anionic surfactant, (e) 0 to 10 percent by weight of a non-ionic surfactant selected from adducts of an alkylene oxide and an aliphatic monoalcohol of 8 to 22 carbon atoms, an unsubstituted or alkyl- or phenyl-substituted phenol, or a fatty acid, amine or amide each of 8 to 22 carbon atoms; alkylene oxide condensation products; reaction products of a fatty acid and hydroxyalkyl or alkoxy-alkyl-amine or alkylene oxide adducts of these reaction products; and fatty alcohols of 8 to 22 carbon atoms, (f) 0 to 10 percent by weight of a surface-active, hydrophilic siloxanoxyalkylene copolymer, (g) 0 to 50 percent by weight of a mixture of paraffins or paraffins in admixture with naphthenes or aromatics and (h) 0 to 70 percent by weight of additives selected from water, high-molecular-weight acids, aqueous ammonia, and aqueous solutions of an alkali metal hydroxide, at least 2% of one of the components (d) and (e) being employed.