Hexanedioic acid, polymer with 1,3-bis(1-isocyanato-1-methylethyl)benzene, 2,2-dimethyl-1,3-propanediol, 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid and 2-methyl-1,5-pentanediamine, compd. with N,N-diethyl