2-Butenedioic acid (2E)-, polymer with 1,3-dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid, α,α'-[(1-methylethylidene)di-4,1-phenylene]bis[ω-hydroxypoly(oxy-1,2-ethanediyl)] and α,α'-[(1-methylethylidene)di-4,1-phenylene]bis[ω-hydroxypoly[oxy(methyl-1,2-ethanediyl)]]