Patent ID: 8609800

Claim:
A method for manufacturing a silylated polyurethane, comprising (A) reacting (i) at least one polyol compound, having a polyoxyalkylene backbone having a number average molecular weight between 8,000 and 20,000 daltons and a polydispersity of less than 2, with (ii) a diisocyanate, with a stoichiometric excess of the diisocyanate compound with respect to the OH groups of the polyol compound or compounds, with the result that a polyurethane prepolymer that is isocyanate-terminated is formed; and (B) reacting the polyurethane prepolymer with one or more OH-terminated silanes of formula (I): in which m is equal to 0, 1, or 2, R 1 is an alkyl residue having 1 to 4 carbon atoms, R 2 is an alkyl residue having 1 to 4 carbon atoms, R 3 is a divalent organic residue having 1 to 12 atoms, selected from C, N, S, and/or O, in the chain, R 4 is a hydrogen atom or an alkyl residue having 1 to 10 carbon atoms, and R is a Bifunctional organic group, in order to cap the isocyanate groups of the prepolymer with the silane of formula (1).