英文名称:2-Pyrrolidinone, 1-ethenyl-, polymer with 1-ethenyl-1H-imidazole and .alpha.-hydro-.omega.-hydroxypoly(oxy-1,2-ethanediyl), graft; 2-Pyrrolidinone, 1-ethenyl-, polymer with 1-ethenyl-1H-imidazole and .alpha.-hydro-.omega.-hydroxypoly(oxy-1,2-ethanediyl), graft