1,4-Benzenedicarboxylic acid, polymer with hexanedioic acid, 1,6-hexanediol, 1,1'-methylenebis[4-isocyanatobenzene] and α,α'-[(1-methylethylidene)di-4,1-phenylene]bis[ω-hydroxypoly[oxy(methyl-1,2-ethanediyl)]]