(E)-2-Butenedioic acid 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,