Propanoic acid, 3-hydroxy-2-(hydroxymethyl)-2-methyl-, polymer with α-(2-aminomethylethyl)-ω-(2-aminomethylethoxy)poly[oxy(methyl-1,2-ethanediyl)], 1,3-bis(1-isocyanato-1-methylethyl)benzene, dimethyl carbonate, 1,6-hexanediol and 1,1'-methylenebis[4-isocyanatocyclohexane], compd. with 2-(dimethylamino)ethanol