66072-18-2 Isocyanic acid, polymethylenepolyphenylene ester, 1,4-butanediol, alpha-hydro-omega-hydroxypoly(oxy(methyl-1,2-ethanediyl)) polymer Isocyanic acid, polymethylenepolyphenylene ester, polymer with 1,4-butanediol and alpha-hydro-omega-hydroxypoly(oxy(methyl-1,2-ethanediyl))