Patent ID: 8642708

Claim:
A composition, comprising A) 100 parts by weight of a silane-terminated polyurethane prepolymer comprising in its backbone urethane units and polyether units and/or polyester units, the individual polyether units and polyester units having an average molar mass Mn of not more than 4000 daltons, and having at least one end group of the formula (1) -L 1 -(CH 2 ) y —SiR 2 3-x (OR 1 ) x (1), B) 1 to 200 parts by weight of parts by weight of a silane-terminated polyether having in its backbone polyether units with an average molar mass Mn of 5000 to 30,000 daltons and having end groups of the formula (2) -L 2 -(CH 2 ) m —SiR 4 3-n (OR 3 ) n (2), and C) 0 to 10 parts by weight of a curing catalyst which accelerates the curing of the composition in the presence of atmospheric moisture, where L 1 is a divalent linking group —O—, —S—, —(R 5 )N—, —O—CO—N(R 5 )—, —N(R 5 )—CO—O—, —N(R 5 )—CO—NH—, —NH—CO—N(R 5 )—, or —N(R 5 )—CO—N(R 5 ), L 2 is a divalent linking group —O—, —S—, —(R 6 )N—, —O—CO—N(R 6 )—, —N(R 6 )—CO—O—, —N(R 6 )—CO—NH—, —NH—CO—N(R 6 )—, or —N(R 6 )—CO—N(R 6 ), R 1 , R 2 , R 3 and R 4 are unsubstituted or halogen-substituted hydrocarbon radicals having 1-6 carbon atoms, or hydrocarbon radicals interrupted by nonadjacent oxygen atoms and having a total of 2-20 carbon atoms, R 5 and R 6 are hydrogen, an unsubstituted or halogen-substituted cyclic, linear or branched C 1 to C 18 alkyl or alkenyl radical, a C 6 to C 18 aryl radical or a radical of the formula —(CH 2 ) y —SiR 2 3-x (OR 1 ) x , y is a whole number from 1 to 10, x is 2 or 3, n is 1, 2 or 3, and m is a whole number from 7 to 10, wherein the composition is free of isocyanate groups.