Patent ID: 7875658

Claim:
A one component moisture-curable isocyanate-free foamable composition, comprising: (A) at least one isocyanate-free, alkoxysilane-terminated prepolymer having silane end groups of the formula 3 where A 1 is an oxygen atom, an N—R 5 group or a sulfur atom, R 5 is a hydrogen atom, an alkyl, cycloalkyl, alkenyl or aryl radical having 1-10 carbon atoms, or a —CH 2 —SiR 3 z (OR 4 )) 3-z group, R 3 is an alkyl, cycloalkyl, alkenyl or aryl radical, having 1-10 carbon atoms, R 4 is an alkyl radical having 1-2 carbon atoms or an ω-oxaalkylalkyl radical having a total of 2-10 carbon atoms and z is 0 or 1, wherein said prepolymer incorporates a polyol component comprising at least one halogen-containing polyol, said halogenated polyol containing on average at least four halogen atoms in each halogenated polyol molecule and (B) at least one blowing agent comprising a mixture of hydrocarbons having 3 to 5 carbon atoms and a polar fluorinated hydrocarbon blowing agent present in 50 weight percent or more based on the weight of the blowing agent, and wherein a foam prepared from the composition is free of cracks when foamed in a model join which consists of 2 wooden boards having the dimensions 1×15×15 cm and 2 plastic beams having the dimensions 2×2×17 cm.