Patent ID: 7557173

Claim:
A composition including a prepolymer that comprises at least one group corresponding to general formula I: —X-A-Si(Z) n (OR) 3−n (I), in which X is an optionally substituted hetero atom, A is a C 1-12 alkylene group, Z and R independently of one another represent —CH 3 or —CH 2 —CH 3 and n=0, 1 or 2, and at least one group corresponding to general formula (II): —N(R 1 )—C(O)—Y—R 2 (II), in which R 1 is H or a linear or branched, saturated or unsaturated C 1-18 alkyl group, R 2 is a linear or branched, saturated or unsaturated C 1-44 alkyl group or a group with the general formula R 3 —(O—CHR 4 —CHR 4 ) m- , where R 3 is a linear or branched, saturated or unsaturated C 1-44 alkylene group and the substituents R 4 independently of one another represent H or a linear or branched C 1-4 alkyl group, m is a number of 1 to 1,000 and Y is O, S or NR 2 , where R 2 is as defined above, and the total number of functional groups I and II in the prepolymer is more than 2, wherein the prepolymer has a polymer backbone based on polymeric MDI or an aniline/formaldehyde condensate; and one or more blowing agents.