68214-39-1 Poly(oxy(methyl-1,2-ethanediyl)), alpha,alpha',alpha''-1,2,6-hexanetriyltris(omega-hydroxy-, polymer with alpha-hydro-omega-hydroxypoly(oxy(methyl-1,2-ethanediyl)) and 1,1'-methylenebis(4-isocyanatobenzene)