| abstract |
The invention relates to swell-resistant polyurethane integral foams that can be obtained by reacting polyisocyanate prepolymers (a) with a polyol mixture (b) containing a polyether polyol (b1) based on a difunctional starter molecule and a polyether polyol (b2) based on a trivalent to pentavalent starter molecule. The polyols (b1) and (b2) are produced by alkoxylation with ethylene oxide (described in the description as PO), and have an ethylene oxide content of more than 50 wt. %, at least 5 % of the ethylene oxide being present in the form of an EO end cap. |