Polymethylenepolyphenylene polyisocyanate, oligomeric reaction products with 2,2-bis(bromomethyl)propane-1,3-diol, polyethoxylated and polypropoxylated glycerol, alpha,alpha',alpha''-1,2,3-propanetriyltris[omega-hydroxypoly[oxy(methyl-1,2-ethanediyl)]], t