Bis-(polyoxypropylene)-dibutyl pyrophosphate

Poly[oxy(methyl-1,2-ethanediyl)], α,α'-[oxybis( butoxyphosphinylidene)]bis[ω-hydroxy-

Polyoxy(methyl-1,2-ethanediyl), .alpha.,.alpha.-oxybis(butoxyphosphinylidene)bis.omega.-hydroxy-