| abstract |
Abstract of the disclosure: Aqueous functional fluids, in particular hy-draulic and metal-working fluids, containing a copoly-mer which is prepared by emulsion or solution copoly-merization, initiated by free radicals, of unsaturated, copolymerizable monomers, the copolymers being built up from: a) 1 - 60% by weight of ethylenically unsaturated car-boxylic acids, b) 0.5 - 30% by weight of a surface-active unsaturated ester, c) 30 - 85% by weight of methacrylic acid esters or acrylic acid esters of aliphatic (C1-C18)-alcohols, d) 0 - 40% by weight of other ethylenically unsaturated comonomers, e) 0 - 3% by weight of polyethylenically unsaturated compounds, and f) 0 - 5% by weight of molecular weight regulators, and, if appropriate, the free acid groups of the copolymers subsequently having been partly or com-pletely neutralized by addition of bases, and con-verted into water-soluble or colloidally water-dispersible copolymer salts. |