Patent ID: 8030366

Claim:
A method of stabilizing a foam which comprises adding polyethers containing urethane or urea groups as foam stabilizers during the process of making the foam, wherein the polyethers containing urethane or urea groups is obtained by reacting A. at least one isocyanate with B. (a) at least one hydrophilic polyether which statistically carries at least one OH and/or NH 2 and/or NH function and (b) at least one hydrophobic polyether which statistically carries at least one OH and/or NH 2 and/or NH function and optionally (c) further compounds which carry at least one OH and/or NH 2 and/or NH function and/or other isocyanate-reactive groups, with the proviso that at least one isocyanate A is ≧difunctional; wherein at least one polyether of the general formula (I) (R 1 ) a [R 2 [(E) c -(P) d —R 3 ] b ] e (I) in which, R 1 , in the case of a=1, is an e-functional nonreactive moiety of an initiator, R 2 , independently of one another, are O, NR 4 , NH or N, E is an ethoxy function, P are identical or different alkoxy function(s) having at least three carbon atoms, R 3 are identical or different radicals from the group consisting of H, —C f H 2f —N(R 4 )H and —C f H 2f —NH 2 , R 4 are identical or different alkyl or aryl functions having 1 to 20 carbon atoms, a is 0or 1, b is 1, 2 or 3, c is from 10 to 500, d is from 0 to 330, e is from 1 to 10, f is from 2 to 5, with the proviso that c>0.6 (c+d), is used as component a).