Hexanedioic acid, polymer with 2,2-dimethyl-1,3-propanediol, 1,2-ethanediamine, α-hydro-ω-hydroxypoly( oxy-1,4-butanediyl), 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid and 1,1'-methylenebis[4-isocyanatocyclohexane], compd. with 2-(dimethylamino)eth