Patent ID: 8501903

Claim:
Reactive, urea-bonded alkoxysilanes, obtained by reacting an OH-terminated polyether block copolymer of the structure B-A n , in which n is equal to 2 to 10 and in which the central block B consists of polyoxytetramethylene, polyoxyethylene, polybutadiene, polyisoprene, polyacrylate, polymethacrylate, polyamide, polyurethane or polyester units and the blocks A consist of polyoxypropylene units, with a stoichiometric excess of diisocyanate to form an NCO-terminated prepolymer Q; and subsequent reaction of the prepolymer Q with a silane compound of the formula (1), in which G is an organic group or hydrogen, R 2 is a divalent alkylene group having 1 to 10 carbon atoms or a —(CH 2 ) o —NR 1 —(CH 2 ) p group, in which o and p are identical or different and equal to 2 to 6 and R 1 is an organic group having a maximum of 10 carbon atoms, R 3 is a linear or branched alkyl residue having 1 to 6 carbon atoms, R 4 is a linear or branched alkyl residue having 1 to 4 carbon atoms and m is equal to 0, 1 or 2.