Synonyms: 1,?-Propanediol, 2(or 3)-(2-propenyloxy)-, polymer with .alpha.-hydro-.omega.-hydroxypoly(oxy-1,4-butanediyl) and 1,1-methylenebis4-isocyanatobenzene;1,2-Propanediol,2-propenyloxy-, polymer with .alpha.-hydro-.omega.-hydroxypoly (oxy-1,4-butanediyl) and 1,1' methylenebis[4-isocyanatobenzene];(2-Prppenyloxy)propanediol polymer with α-hydro-ω-hydroxtpoly(oxy-1,4-butanediyl) and 1,1′-methylenebis[4-isocyanato-benzene]