Hexanedioic acid, polymer with 1,4-butanediol, 1,6-diisocyanatohexane, dimethyl carbonate, 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, 1,6-hexanediol, 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid, 1,3-isobenzofurandione and 1,1'-methylenebis[4-isocyanatocyclohexane], compd. with 2-(dimethylamino)ethanol