Moisture-curable, polyether urethanes with reactive silane groups and their use as sealants, adhesives and coatings

The present invention relates to moisture-curable urethanes containing reactive silane groups and prepared from polyether polyols having a low degree of unsaturation and to the use of these polyurethanes as sealants, adhesives and coatings. A moisture curable, alkoxysilane-functional polyether urethanes containinga) 20 to 90% by weight, of a polyether urethane containing two or more reactive silane groups and polyether segments having a number average molecular weight (Mn) of at least 3000 and a degree of unsaturation of less than 0.04 milliequivalents/g, where the sum of Mn of the polyether segments averages 6000 to 20,000, and the reactive silane groups are incorporated by reaction of an isocyanate-reactive group with a compound of formulab) 10 to 80% by weight, of a polyether urethane containing one reactive silane group and one or more polyether segments having Mn of 1000 to 15,000, where the reactive silane groups are incorporated by the reaction of an isocyanate group with a compound of formula