Patent ID: 8263226

Claim:
A moisture-curing hotmelt adhesive composition comprising at least one silane-functional polyurethane prepolymer of the formula (I) where R 1 is an n-valent organic radical of a prepolymer P, which is prepared from at least one polyol and at least one polyisocyanate and has at least n isocyanate groups, following removal of n isocyanate groups; R 2 is an alkyl group having 1 to 10 C atoms; R 3 is a linear or branched alkylene group having 1 to 10 C atoms; X is a hydrolyzable radical selected from the group consisting of where R′ is an aryl group and, if present, R″ is an aryl group; a is a value of 0, 1or 2; n is a value of 2 or more, the prepolymer P having a molecular weight of above 2000 g/mol, being solid at room temperature, and having no further silane group; wherein the silane-functional polyurethane prepolymer of the formula (I) is obtained from the reaction of a polyurethane prepolymer P having at least n isocyanate groups with a mercaptosilane of the formula (II): HS—R 3 —Si(X) (3-a) (R 2 ) a (II). where X, R 2 and R 3 are defined as set forth above.