Patent ID: 7524915

Claim:
A process for making a moisture-curable silylated resin composition comprising reacting in the presence or absence of catalyst at least one polyether polyol (i), at least one polyisocyanate (ii) and at least one isocyanatosilane (iii), the NCO/OH ratio of the polyisocyanate (ii) and the polyol (i) being from about 0.1 to about 0.9 and the NCO/OH ratio of the isocyanatosilane (iii) and polyol (i) being from about 0.9 to about 0.1, provided, when hydroxyl-terminated polyurethane prepolymer prior to completion of the polyurethane prepolymer-forming reaction wherein the hydroxyl-terminated polyurethane prepolymer reaction medium has an isocyanate concentration of at least 0.03 % NCO, isocyanatosilane (iii) is added to the reaction medium to produce silylated polyurethane and wherein the process is a two-step process comprising: (1) reacting polyol (i) with part of polyisocyanate (ii); and (2) reacting the composition of step (1) with the remaining part of polyisocyanate (ii) and all of isocyanatosilane (iii).