De-icing and anti-icing agent for aircraft

Claim 1

De-icing and anti-icing agent for aircraft, based on glycols and water and containing crosslinked acrylic polymers as the thickener, consisting essentially of: (a) 40 to 70% by weight of a glycol having an alkylene chain of 2 to 3 carbon atoms or a oxalkylene glycol having 4 to 6 carbon atoms, (b) 0.1 to 1% by weight of crosslinked acrylic polymers consisting essentially of 1 part by weight of a crosslinked copolymer formed from acrylic acid or an alkali metal acrylate and acrylamide and containing 10 to 90% by weight of copolymerized units of acrylic acid or alkali metal acrylate and 10 to 90% by weight of copolymerized units of acrylamide and 1 to 10 parts by weight of a crosslinked homopolymer of acrylic acid or an alkali metal acrylate, subject to the proviso that the homopolymer and the copolymer each have a viscosity of 5000 to 70,000 mPa s and a laminar flow behavior at a shear rate of 0 to 20,000 seconds -1 , the viscosity and the laminar flow behavior each being determined using a 0.5% strength by weight aqueous solution at 20° C. and a pH of 7 by means of a Brookfield viscometer at 20 r.p.m. and a rotational viscometer for shear rates of up to 20,000 seconds -1 , respectively, (c) 0.05 to 1% by weight of a surfactant consisting essentially of an alkali metal alkylarylsulfonate, (d) 0.01 to 1% by weight of at least one corrosion inhibitor, (e) the three following basic compounds (e 1 ) to (e 3 ) in the amounts indicated, in order to adjust the pH of the agent to a value of 7.5 to 11, (e 1 ) 0.03 to 1% by weight of ammonia, monoethanolamine, diethanolamine or triethanolamine or a mixture thereof, (e 2 ) 0.10 to 0.7% by weight of potassium hydroxide and (e 3 ) 0.02 to 0.5% by weight of a further alkali metal hydroxide, and (f) water as the remaining percentage by weight, the percentages by weight relating in each case to the weight of the agent.