| abstract |
The present invention is polyurethanen n n A) 25 to 90 weight percent 1-isocyanate-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and 10 weight percent to 4,4'-diisocyanatodicyclohexylmethane 75% by weight of the mixture, wherein the percentages are based on the weight of component A),n n n B) at least one polyol having an average molecular weight (Mn) of 500 to 6000,n n n C) at least one compound having at least one OH- or NH-functional group and containing a carboxyl group and / or carboxylate group, wherein at least 50 mole% of the acid groups, based on the total moles of acid incorporated into the polyurethane, Incorporated by propionic acid),n n n D) at least one polyol and / or polyamine having an average molecular weight (Mn) of less than 500, andn n n E) optionally a reaction product with at least one monoalcohol and / or monoamine,n n n Aqueous polyurethane dispersions free of N-methylpyrrolidone and other solvents.n n n The invention also relates to a process for the preparation of aqueous polyurethane dispersions and to the use of polyurethane dispersions for the production of coatings or adhesives.n n n Polyurethane Dispersion, Dimethylolpropionic Acid, N-methylpyrrolidone, Coating, Resistance |