Patent ID: 7550517

Claim:
An isocyanate-free foamable mixture comprising: (A) a mixture of prepolymers in which 50-99% of the chain ends are terminated by alkoxysilyl groups and 1-50% of the chain ends are terminated by groups of the formula [2] A 1 -R 1 [2] where A 1 is an oxygen atom, an N—R 2 group or a sulfur atom wherein when A 1 is NR 2 or oxygen, A 1 is part of a urea or urethane group, respectively, R 1 is an alkyl, cycloalkyl, alkenyl, aryl or arylalkyl radical having 2-50 carbon atoms in which the carbon chain is optionally interrupted by nonadjacent oxygen atoms, sulfur atoms or N—R 2 groups, and the carbon chain of R 1 is optionally substituted by lateral alkyl groups having 1-10 carbon atoms or halogen atoms, and R 2 is a hydrogen atom or an alkyl, alkenyl or aryl radical having 1-10 carbon atoms, and (B) a hydrocarbon blowing agent.