Hexanedioic acid, polymer with 1,3-bis(1-isocyanato-1-methylethyl)benzene, 1,4-cyclohexanedimethanol, 2,2-dimethyl-1,3-propanediol, 3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid, 1,1'-methylenebis[4-isocyanatocyclohexane] and 2-methyl-1,5-pentanediamine, 2-methyl-2-propanamine-blocked, compds. with triethylamine