Hydrophilic polyurethane-polyureas (I) are obtd. by reacting (A) polyisocyanate(s) with (B) fatty acid deriv(s). which is/are reactive towards (a), (C) opt. a cpd. with more than 2 OH and/or COOH gps., (D) a polyalkylene glycol with a mol. wt. of 500-10,000 and (E) a cpd. with active H atom(s) which react more rapidly than water with NOC gps., with a mole ratio of (NCO gps.):(all NCO-reactive H atoms in A-E) = (0.5:1)-(2:1). Pref. mole ratio of (NCO gps.):(H atoms in OH and amino gps. in all components A-E) = (0.7:1)-(1.5:1); amts. of co-reactants are 0.1-1 mole (B), 0-0.8 mole (C), 0.1-0.8 mole (D) and 0.01-0.3 mole (E) to 1 mole (A). (B) comprise opt. unsatd. cpds., pref. fatty alcohols, fatty amines, or ethoxylated fatty alcohols or amines contg. 1-30 ethylene oxide (EO) units, esp. ethoxylated fatty alcohols with 1-20 EO units, or reaction prods. of fatty acids with polyols which may also contain amino gps., or reaction prods. of fatty acids and mono-epoxides. (C) is a bis-hydroxy-alkanecarboxylic acid, pref. dimethylolpropionic acid (DMPA).
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