150448-83-2 2-Oxepanone, alpha-hydro-omega-hydroxypoly(oxy-1,2-ethanediyl),1,4-butanediol, methylenediphenyldiisocyanate polymer 2-Oxepanone, polymer with 1,4-butanediol, alpha-hydro-omega-hydroxypoly(oxy-1,2-ethanediyl) and 1,1'-methylenebis(isocyanatobenzene)