Patent ID: 7465778

Claim:
A curable, alkoxysilane-functional polyether urethane composition formed by combining a) a first silane terminated polyurethane prepared by reacting: i) at least one mono-functional compound selected from the group consisting of polyethers, amines, amine terminated polyethers, or polysulfides having a hydroxyl, amine or thiol functional group, and mixtures thereof, having a number average molecular weight of from 500 to 20,000, and having a structure according to formula (III): R 2 -(-Z-CR 3 n -) m -Z-H (III) wherein R 2 represents a C 1 -C 22 linear branched or cyclic alkyl, aryl, aralkyl, alkaryl, or alkenyl group; each occurrence of R 3 is independently a H, methyl or ethyl group, n is from 1 to 5, m is from 10 to 1,000; and each occurrence of Z is independently an O, S or —NR 4 -group, wherein R 4 is an H, methyl, ethyl, propyl, n-butyl or t-butyl group with ii) an isocyanate component containing two isocyanate groups, the reaction product of i) and ii) reacted with iii) a compound containing an isocyanate-reactive group and at least one reactive silane group in which at least 10 mole % of component iii) is a compound corresponding to formula (I) wherein X represents identical or different organic groups which are inert to isocyanate groups below 100° C., provided that at least two of these groups are alkoxy or acyloxy groups, Y represents a linear or branched alkylene group containing 1 to 8 carbon atoms and R 1 represents an organic group which is inert to isocyanate groups at a temperature of 100° C. or a group corresponding to formula II —Y—Si—(X) 3 (II) to form a moisture-curable, alkoxysilane-functional polyether urethane; and b) a second silane terminated polyurethane prepared by reacting: i) n-propanol or n-butanol or t-butanol with ii) an isocyanate component containing two isocyanate groups, the reaction product of i) and ii) reacted with iii) a compound containing an isocyanate-reactive group and at least one reactive silane groups corresponding to formula (I) as defined above.