英文名称:2-Oxepanone, polymer with 1,4-butanediol, alpha-hydro-omega-hydroxypoly(oxy-1,2-ethanediyl) and 1,1-methylenebis(4-isocyanatobenzene); 2-Oxepanone, polymer with 1,4-butanediol, .alpha.-hydro-.omega.-hydroxypoly(oxy-1,2-ethanediyl) and 1,1’-methylenebis[4-isocyanatobenzene]