Carbonic acid, diphenyl ester, polymer with 1,4-butanediol, 2-ethyl-2-(hydroxymethyl)-1,3-propanediol, 1,6-hexanediol, .alpha.-hydro-.omega.-hydroxypolyoxy(methyl-1,2-ethanediyl), 1,1-methylenebisisocyanatobenzene and methyloxirane