| 摘要 |
The present invention relates to a process for preparing alkoxysilane-functional prepolymers by reacting A) 1.0 equivalent of a polyol component have a number average molecular weight of 3000 g/mol to 20,000 g/mol and containing one or more polyQxyalkylene polyols or polyoxyalkylene polyol prepolymers with B) 1.05 to 1.50 equivalent of an isocyanate-and alkoxysilane-functional compound of formula I) wherein X, Y, and Z independently of one another are linear or branched C<SUB>1</SUB>-C<SUB>8 </SUB>alkyl or C<SUB>1</SUB>-C<SUB>8 </SUB>alkoxy radicals, wherein at least one of the radicals is a C<SUB>1</SUB>-C<SUB>8 </SUB>alkoxy group and R is an organic radical having a functionality of at least two, and subsequently further reacting the remaining free NCO groups by allophanatization or by reaction with C) an isocyanate-reactive component. The present invention also relates to the alkoxysilane-functional prepolymers obtained by the process of the invention.
|
