PREPARATION OF AMINO-SILANE TERMINATED POLYMER BY USING ORGANIC BISMUTH CATALYST AND CURED POLYMER THEREFROM BY USING NON-TIN CATALYST

摘要

The present invention relates to a process for making moisture curable silylated polyurethane resin comprising: preparing a hydroxy-terminated polyurethane prepolymer by reacting a molar excess of a polyether polyol with a polyisocyanate in the presence of at least one urethane reaction-promoting catalyst selected from the group consisting of bismuth and zinc compounds, and reacting the hydroxy-terminated polyurethane prepolymer with an isocyanatoalkoxysilane to provide for an alkoxysilyl-terminated polyurethane prepolymer. The process further comprises the steps of adding an aluminum compound to the alkoxysilyl-terminated polyurethane prepolymer of step (ii) as a curing catalyst, with the proviso that the process steps (i) to (iii) are conducted in the absence of tin catalyst.