Patent ID: 7635743

Claim:
Alkoxysilane-functional composition, obtained by reaction of A) polyurethane prepolymers obtained by reaction of i) at least one aromatic, aliphatic, araliphatic and/or cycloaliphatic diisocyanate with ii) at least one linear polyester polyol which is solid at room temperature, and iii) optionally one or more amorphous linear polyester polyols and/or one or more linear polyester polyols which are liquid at room temperature, and optionally one or more linear polyether polyols, wherein the ratio of amounts of i) to ii) is chosen such that the molar ratio of NCO to OH is from 1.2 to 4.0, with B) compounds containing alkoxysilane and amino or mercapto groups, of the general formula (I) in which X, Y and Z represent identical or different straight-chain or branched (C 1 -C 8 )alkyl radicals or cyclic (C 3 -C 8 )alkyl radicals or (C 1 -C 8 )alkoxy radicals, with the proviso that at least one of the radicals is a (C 1 -C 8 )alkoxy radical, R represents straight-chain or branched alkylene radicals having 1 to 8 carbon atoms or cyclic alkylene radicals having 3 to 8 carbon atoms, W represents either —SH or —NH—R′ wherein R′ represents hydrogen, straight-chain or branched alkyl radicals having 1 to 8 carbon atoms or cyclic alkyl radicals having 3 to 8 carbon atoms or aryl radicals or radicals of the general formula (II) wherein R″ and R′″ represent identical or different straight-chain or branched alkyl radicals having 1 to 8 carbon atoms or cyclic alkyl radicals having 3 to 8 carbon atoms wherein the ratio of amounts of A) to B) is chosen such that 0.95 to 1.1 mol of amino or mercapto groups from B) are employed per mol of NCO groups from A), and addition of C) bis-(N, N′-dimethylaminoethyl) ether.