Thickening agent based on polyurethane

摘要: The invention relates to a thickening agent based on an aqueous preparation of water-dispersible or water-soluble non-ionic polyurethanes. Said polyurethanes can be produced by reacting (a) at least one hydrophilic polyol containing, per molecule, two OH groups and functional that are selected from the functions -O- (ether groups) -COO- (ester groups), molar weight said compounds amounting 300, (b) hydrophobic compound zerewitinoff-active hydrogen atom, linear branched, saturated unsaturated alkyl chain which comprises five successive C atoms is not linked heteroatoms, being between 100 500, (c) difunctional isocyanate, characterised in a), b) c) reacted atomic ratios OHa): ZHb): NCOc) 1: (1 +x): 2(1 +y), proviso following conditions hold good: x represents number 0.05 1.2, y (0,2 1,05) x. inventive excellent action, especially for dispersions.