1,3-Benzenedicarboxylic acid, polymer with 2,4-diisocyanato-1-methylbenzene, hexanedioic acid, .alpha.-hydro-.omega.-hydroxypolyoxy(methyl-1,2-ethanediyl), 1,1-methylenebis4-isocyanatobenzene, 2,2-oxybisethanol, 1,1-oxybis2-propanol and 1,2-propanediol