Propanoic acid, 3-hydroxy-2-(hydroxymethyl)-2-methyl-, polymer with α-hydro-ω-hydroxypoly(oxy-1,2-ethanediyl) ether with 2-ethyl-2-(hydroxymethyl)-1,3-propanediol (3:1), α-hydro-ω-hydroxypoly[oxy(methyl-1,2-ethanediyl)] and 1,1'-methylenebis[4-isocyanatocyclohexane], diethanolamine-blocked