| abstract |
Aqueous dispersions of N-methylpyrrolidone-free polyurethane and solvents, which can be obtained from A) a mixture of 25 to 90% by weight of 1-isocyanate-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and 10 to 75% by weight of 4,4 '' - diisocyanate-dicyclohexylmethane, B) one or more polyols with average molecular weights (Mn) of 500 to 3,000, C) one or more compounds having at least one functional group OH or NH and contain a carboxyl and / or carboxylate group, in which at least 50 mol%, based on the amount of acid introduced into the total resin, is composed of dimethylolpropionic acid, as well as D) one or more polyols and / or polyamines with average molecular weights (Mn) of less than 500, as well as E), if necessary, one or more monoalcohols and / or monoamines (E). |