N-Methyl pyrrolidone-free polyurethane dispersons based on dimethylol propionic acid

摘要

Aqueous N-methylpyrrolidone- and solventfree polyurethane- dispersion (I) comprises a mixture of 1-isocyanate-3,3,5-trimethyl-5-isocyanato-methylcyclohexane (25-90 wt.%) and 4,4'-diisocyanato-dicyclohexylmethane (10-75 wt.%); one or more polyol with average molar weight of 500-6000; a dimethyolpropionicacid containing one or more OH, NH, carboxyl and/or caboxylate group, where at least 50 mol.% acid is introduced in the resin; one or more polyol and/or polyamine with average molecular weight of 500; and one or more monoalcohol and/or monoamine. An independent claim is included for a method for preparing (I).