| abstract |
Silylated polyurethanes can be prepared by Implement With at least one polyol compound having a molecular weight of 4,000 to 20,000 daltons with A diisocyanate at a stoichiometric excess of the diisocyanate compound over the polyol compound or polyol compounds, thereby forming a polyurethane prepolymer that is isocyanate-terminated; and Subsequent reaction of the polyurethane prepolymer with one or more OH-terminated silanes of the formula (1): to a polyurethane with predominantly terminal alkoxysilyl groups. In the formula (1), m = 0.1 or 2, R 1 is an alkyl group having 1 to 4 carbon atoms, R 2 is an alkyl group having 1 to 4 carbon atoms, R 3 is a divalent organic group having 1 to 10 atoms selected from C , N and / or O in the chain, but preferably exclusively carbon atoms, R 4 is a hydrogen atom or an alkyl radical having 1 to 10 carbon atoms and R is a difunctional organic group, preferably a linear or branched alkyl group having 1 to 6 carbon atoms. The silylated polyurethanes are suitable for use in a preparation as an adhesive, sealant or coating agent. |